JP3805870B2

JP3805870B2 - Pressure relief valve device for hot water storage water heater

Info

Publication number: JP3805870B2
Application number: JP26707997A
Authority: JP
Inventors: 久唐沢; 健渡辺; 馨片山; 修一坂口
Original assignee: 東芝機器株式会社
Priority date: 1997-09-30
Filing date: 1997-09-30
Publication date: 2006-08-09
Anticipated expiration: 2017-09-30
Also published as: JPH11108450A

Description

【０００１】
【発明が属する技術分野】
この発明は、タンク内で沸した湯を貯留し、その湯水を浴槽等の所定の給湯部へ供給する貯湯式温水器の圧力逃し弁装置に関する。
【０００２】
【従来の技術】
この種の貯湯式温水器の構成を図８に示してある。１は温水器の筐体で、この筐体１内に縦長のタンク２が収納され、このタンク２の内底部にヒータ３が配設されている。タンク２の下部には水源としての水道に直結した給水管４が接続され、タンク２の上部には給湯管５が接続されている。給水管４の途中には水圧を一定に保つための減圧弁６が設けられ、給湯管５の途中には給湯弁７が設けられている。さらにタンク２の下部には排水管８が接続され、この排水管８の途中に排水栓９が設けられている。
【０００３】
タンク２内には水源から給水管４を通して常温水が供給され、この常温水がヒータ３により加熱されて設定温度の湯水に沸し上げられて貯留される。タンク２内の貯湯水は、給湯弁７の開放に応じて給湯管５を通して所定の給湯部に順次供給される。
【０００４】
タンク２の上部にはタンク２および給湯管５に連通する圧力逃し弁１０が設けられ、この圧力逃し弁１０に大気中に連通する導通管１１が接続されている。そしてタンク２内での湯沸し中の蒸気や膨脹水等の影響でタンク２内の圧力が一定以上に上昇したときにその圧力で圧力逃し弁１０が自動的に開放し、この開放でタンク２内の圧力の異常上昇が防止される。
【０００５】
また、タンク２内の清掃や点検時において、タンク２内の湯水や沈殿物等を排出する場合には、圧力逃し弁１０を手動で開放してタンク２内を大気中に連通させ、この状態で排水管８の排水栓９を開放してタンク２内の湯水や沈殿物等を排出する。
【０００６】
このような圧力逃し弁１０の構造を図９に示してあり、１２が弁本体で、この弁本体１２は給湯管５を通してタンク２内に連通する流入口１３と、導通管１１を通して大気中に連通する流出口１４とを有し、これら流入口１３と流出口１４との間に隔壁１５が設けられ、この隔壁１５に弁口１６が形成されている。そして弁本体１２内にダイヤフラム式の弁体２０が前記弁口１６の周縁の弁座１６ａに対して接離可能に設けられ、この弁体２０がスプリング２１により弁座１６ａに圧着するように弾性的に付勢され、この付勢力で通常時には弁口１６が弁体２０で密閉されている。
【０００７】
弁体２０には揚弁軸２２が取り付けられ、この揚弁軸２２の一端は弁本体１２の一部を構成するキャップ１２ａを貫通して弁本体１２の外部に突出し、その突出端部にスナップリング２３を介して操作レバー２４が回動自在に取り付けられている。
【０００８】
この操作レバー２４の一端側の端部には操作ワイヤ２５が締結され、この操作ワイヤ２５が筐体１の前面カバー１ａを通してその外部に導出され、その導出端部に摘み用のリング２６が取り付けられている。
【０００９】
通常時には圧力逃し弁１０の弁口１６が弁体２０で密閉されているが、タンク２内での湯沸し時に蒸気や膨脹水等の影響でタンク２内の圧力が一定以上に上昇すると、その圧力で弁体２０がスプリング２１に抗して押し動かされ、これにより弁口１６が開放し、タンク２内が大気中に連通し、この連通でタンク２内の圧力が外部に逃げ、その圧力の異常上昇が防止される。
【００１０】
一方、タンク２内の清掃や点検に際してタンク２内の湯水や沈殿物等を排出する場合には、筐体１の前面カバー１ａを取り外し、操作レバー２４を手動で回動操作して、図９に鎖線で示すように操作レバー２４が揚弁軸２２の軸方向に沿って配置する作動姿勢にセットする。
【００１１】
操作レバー２４が回動した際には、この操作レバー２４によるてこの作用で揚弁軸２２がスプリング２１に抗して引き寄せられ、これにより弁体２０が弁座１６ａから離間して弁口１６が開放され、この開放状態が保持される。
【００１２】
この開放状態においてはタンク２内が大気中に連通し、したがってこの状態で排水管８の排水栓９を開放すればタンク２内の湯水や沈殿物等をその排水管８を通して排出することができる。
【００１３】
【発明が解決しようとする課題】
ところで、この種の貯湯式温水器においては、圧力逃し弁１０に湯垢等が付着し、その湯垢等の固結で弁体２０の作動が緩慢となったり作動不良となることがある。そこで、温水器のユーザや管理者に対して圧力逃し弁１０を定期的に作動させる作動チェックの実施を要請している。
【００１４】
この作動チャックは、筐体１の前面に導出されている操作ワイヤ２５を小刻みに数回引っ張る操作であり、その引っ張り力と弁体２０を閉止方向に弾性的に付勢しているスプリング２１との相互の作用で弁体２０が繰り返して作動し、この作動で湯垢等による弁体２０の固結が防止される。
【００１５】
ところが、この作動チェック時に操作ワイヤ２５を強く引っ張り過ぎると、操作レバー２４が揚弁軸２２の軸方向に沿って配置する作動姿勢にまで回動してしまうことがあり、このような場合には、通常時においても弁口１６が開放したままの状態となり、湯沸し中の湯や蒸気が無秩序に流出するなどして圧力逃し弁１０の機能が失われてしまう結果となる。
【００１６】
この発明はこのような点に着目してなされたもので、その目的とするところは、作動チェック時には操作レバーの回動範囲を適正な範囲に規制して、弁口が開放状態のまま放置されるような不都合が生じることがないようにした貯湯式温水器の圧力逃し弁装置を提供することにある。
【００１７】
【課題を解決するための手段】
請求項１の発明は、温水器のタンクと、このタンクに設けられ、スプリングにより閉弁方向に弾性的に付勢された弁体と、この弁体を連動する揚弁軸と、この揚弁軸に回動自在に取り付けられ、その回動によるてこの作用で前記スプリングに抗して前記弁体を弁口から離間する方向に移動させるとともに、その回動が一定角度に達したときにその姿勢が保持される操作レバーとを備える圧力逃し弁装置において、前記操作レバーはその回動中心位置を境とする一方側にグリップ部を有し、この操作レバーが一方向に回動する際には前記グリップ部が前記タンクの一部に当接してその回動範囲が前記一定角度未満に規制され、前記操作レバーが逆方向に回動する際には前記一定角度に達するまで回動することが可能となっていることを特徴とするものである。
【００１８】
請求項２の発明は、スプリングにより閉弁方向に弾性的に付勢された弁体と、この弁体を連動する揚弁軸と、この揚弁軸に回動自在に取り付けられ、その回動によるてこの作用で前記スプリングに抗して前記弁体を弁口から離間する方向に移動させるとともに、その回動が一定角度に達したときにその姿勢が保持される操作レバーとを備える圧力逃し弁装置において、前記操作レバーを回動させるための操作線材を操作レバーに取り付け、この操作線材にはほぼＵ字状に屈曲するフック部を形成し、このフック部の内側に操作レバーのプレート部の一端側の端部を介在させた状態で操作線材を引っ張ることにより前記フック部により操作レバーの回動範囲を前記一定角度未満に規制し、フック部の内側に操作レバーのプレート部の一端側の端部が介在しない状態で操作線材を引っ張ることにより操作レバーを前記一定角度に達するまで回動させることを可能にしたものである。
【００１９】
【発明の実施の形態】
以下、この発明の一実施形態について図１ないし図５を参照して説明する。
この実施形態の場合には、圧力逃し弁１０の取付姿勢が図９に示す状態から９０°向きを変えた状態にあり、したがって揚弁軸２２がほぼ垂直に配置している。そして弁本体１２のキャップ１２ａから突出した揚弁軸２２の上端部にスナップリング２３を介して操作レバー２４が回動自在に取り付けられ、そのスナップリング２３と揚弁軸２２との結合部が操作レバー２４の回動支点Ｐとなっている。
【００２０】
操作レバー２４は平板状のプレート部２７を有し、このプレート部２７の一端側の端縁に回動支点Ｐの反対側に折曲する舌片３０が形成され、この舌片３０に透孔３１が穿設されている。
【００２１】
３２は適度な剛性をもつ金属ワイヤからなる操作線材で、この操作線材３２は一端側の端部にほぼＵ字状に屈曲するフック部３３を、他端側の端部にリング状に屈曲する摘み部３４をそれぞれ一体に有している。フック部３３は円弧状に湾曲する弧状部３３ａと、この弧状部３３ａから摘み部３４の配置側に向かって直線状に延びる直状部３３ｂとからなっている。
【００２２】
この操作線材３２は筐体１の前面カバー１ａに形成された透孔１ｂおよび操作レバー２４の舌片３０に形成された透孔３１に挿入されている。この操作線材３２は操作レバー２４のプレート部２７の上に配置し、図１の状態においてはフック部３３がプレート部２７の一端側の端部に係合し、そのフック部３３の直状部３３ｂがプレート部２７の下側に延びている。そして摘み部３４が形成された操作線材３２の基端側は前面カバー１ａの外方に余裕の長さをもって突出している。
【００２３】
前面カバー１ａの内側にはガイド金具３５が取り付けられ、このガイド金具３５には図２および図３に示すように、上部にガイド溝３６が、一端縁部に係止溝３７がそれぞれ形成され、前記ガイド溝３６内に操作線材３２の途中が摺動自在に嵌合され、前記係止溝３７内にスナップリング２３の途中が嵌合されて係止されている。
【００２４】
図１は通常時の状態であり、この状態から圧力逃し弁１０に対する作動チェックを行なう際には、作業者が前面カバー１ａの外側から操作線材３２の摘み部３４を摘んで操作線材３２を手前側に引っ張る。
【００２５】
操作線材３２を手前側に引っ張ると、図４に示すように、その引っ張り力で操作レバー２４が支点Ｐを中心にして上方に回動し、この回動によるてこの作用で圧力逃し弁１０の揚弁軸２２が弁本体１２内のスプリングに抗して引き上げられ、この動作で弁体が弁座から離間する。そして操作線材３２の引っ張りを緩めると、前記スプリングの弾性力で揚弁軸２２が下降し、弁体が弁座に当接する。このような動作を数回繰り返すことにより、弁体が小刻みに弁座に接離し、この接離動作で湯垢等による弁体の固結が防止される。
【００２６】
この際、操作線材３２を手前側に強く引っ張ると、これに応じて操作レバー２４の回動角度が大きくなるが、その角度が一定の角度つまりほぼ９０°となる前に図４に示すように、フック部３３の内側に介在している操作レバー２４のプレート部２７がそのフック部３３の直状部３３ｂに当接し、この当接で操作レバー２４の回動が一定角度未満に規制され、したがって操作線材３２を手前側に強く引っ張っても操作レバー２４が揚弁軸２２の軸方向に沿って配置する作動姿勢となるようなことがない。
【００２７】
一方、タンク内の湯水や沈殿物等を排出する場合には、まず操作線材３２を図１の状態から筐体１の奥方側に押し込んでフック部３３を操作レバー２４のプレート部２７から離脱させ、この状態で舌片３０の透孔３１を中心にして操作線材３２を軸回り方向に１８０°回動して反転させ、フック部３３をプレート部２７の上側に向ける。
【００２８】
次に、操作線材３２を手前側に引き込む。この引き込みによりフック部３３が舌片３０に係合し、さらに操作線材３２を引き込むと図５に示すように、操作レバー２４が操作線材３２で引っ張られて反時計方向に回動する。このときには、操作線材３２のフック部３３の内側に操作レバー２４のプレート部２７が介在しないフリーな状態となっており、したがって図５（Ａ）に示すように、操作レバー２４が途中まで回動してもその動作が規制されず、このため操作線材３２を手前側に強く引っ張って前面カバー１ａの前方側に長く引き出すと、図５（Ｂ）に示すように、操作レバー２４が一定角度にまで回動し、操作レバー２４が揚弁軸２２の軸方向に沿って配置する作動姿勢となり、この状態が保持される。そしてこの姿勢の保持により弁本体１２内の弁口の開放が保持され、タンク内が大気中に連通し、これによりタンク内の湯水や沈殿物等の排出が可能となる。
【００２９】
タンク内の湯水や沈殿物等の排出処理作業が終了した後には、図５（Ｂ）の状態から、操作線材３２を筐体１の奥方側に押し込む。この押し込みにより作動レバー２４が操作線材３２におけるフック部３３の弧状部３３ａで押圧されて時計方向に回動して図１に示す通常時の状態に復帰する。
【００３０】
このように、圧力逃し弁１０の作動チェック時には操作レバー２４の回動範囲を適正な範囲に規制してその作動チェックの作業を的確に行なうことができるととともに、タンク内の湯水や沈殿物等の排出処理時には、操作線材３２を軸回り方向に回動して引っ張るだけで操作レバー２４を所定の作動姿勢に保ってその排出処理作業を的確に行なうことができる。
【００３１】
そして操作レバー２４を作動姿勢にセットする際に、前面カバー１ａを何ら取り外すことなく、前面カバー１ａの外側からその操作を容易に能率よく行なうことができる。
【００３２】
図６には操作レバー２４の回動範囲を規制する他の手段を示してある。この例においては、揚弁軸２２が横向きとなっており、また操作レバー２４にその長手方向に沿う長孔３８が形成され、この長孔３８を通してスナップリング２３の端部が揚弁軸２２に結合されている。
【００３３】
そして通常時には、図６（Ａ）に示すように、スナップリング２３を支点にして操作レバー２４が垂直に支持されており、この状態から操作ワイヤ４１を介して操作レバー２４を斜め上方に引っ張ると、図６（Ｂ）に示すように操作レバー２４が長孔３８の長さ分だけ上方に移動し、スナップリング２３が長孔３８の下端部に配置した状態となる。そして操作ワイヤ４１をさらに引っ張ると、図６（Ｃ）に示すように、長孔３８の下端部に配置したスナップリング２３を支点にして操作レバー２４が反時計方向に回動し、この回動により操作レバー２４の角部３９がキャップ１２ａの表面に当接し、この当接に伴うてこの作用で揚弁軸２２が引き寄せられる。
【００３４】
この際、操作ワイヤ４１をより強く引っ張ると、操作レバー２４のグリップ部４０がキャップ１２ａの縁部に当接し、この当接で操作レバー２４の回動が規制される。
【００３５】
一方、操作レバー２４を揚弁軸２２の軸方向に沿う作動姿勢にセットする場合には、操作レバー２４が垂直に配置する図７（Ａ）の状態から作業者がグリップ部４０を握り、図７（Ｂ）に示すように操作レバー２４を時計方向に回動する。この操作により操作レバー２４が作動姿勢に保持され、弁本体１２内の弁口が開放保持される。
【００３６】
【発明の効果】
以上説明したようにこの発明によれば、圧力逃し弁の作動チェック時には操作レバーの回動範囲を適正な範囲に規制することができ、したがって弁口が開放状態のまま放置されるような不都合がなく、常に圧力逃し弁を正常に機能させることができる。
【図面の簡単な説明】
【図１】この発明の一実施形態に係る圧力逃し弁装置の通常時の状態を示す側面図。
【図２】その圧力逃し弁装置の平面図。
【図３】その圧力逃し弁装置におけるガイド金具の正面図。
【図４】その圧力逃し弁装置の作動チェック時の状態を示す側面図。
【図５】その圧力逃し弁装置の揚弁軸を作動姿勢にセットするときに動作を順に示す側面図。
【図６】操作レバーの回動範囲を規制する手段の一例を示す側面図。
【図７】その操作レバーを作動姿勢にセットするときに動作を順に示す側面図。
【図８】貯湯式温水器の構成図。
【図９】従来の圧力逃し弁装置の断面図。
【符号の説明】
１０…圧力逃し弁
１２…弁本体
１６…弁口
２０…弁体
２１…スプリング
２２…揚弁軸
２３…スナップリング
２４…操作レバー
２７…プレート部
３０…舌片
３１…透孔
３２…操作線材
３３…フック部
３４…摘み部[0001]
[Technical field to which the invention belongs]
The present invention relates to a pressure relief valve device for a hot water storage type hot water heater that stores hot water boiled in a tank and supplies the hot water to a predetermined hot water supply section such as a bathtub.
[0002]
[Prior art]
The configuration of this type of hot water heater is shown in FIG. Reference numeral 1 denotes a casing of a water heater, in which a vertically long tank 2 is accommodated in the casing 1, and a heater 3 is disposed on the inner bottom portion of the tank 2. A water supply pipe 4 directly connected to a water supply as a water source is connected to the lower part of the tank 2, and a hot water supply pipe 5 is connected to the upper part of the tank 2. A pressure reducing valve 6 for keeping the water pressure constant is provided in the middle of the water supply pipe 4, and a hot water supply valve 7 is provided in the middle of the hot water supply pipe 5. Further, a drain pipe 8 is connected to the lower part of the tank 2, and a drain plug 9 is provided in the middle of the drain pipe 8.
[0003]
In the tank 2, room temperature water is supplied from a water source through a water supply pipe 4, and this room temperature water is heated by the heater 3, boiled into hot water at a set temperature, and stored. The hot water stored in the tank 2 is sequentially supplied to a predetermined hot water supply section through the hot water supply pipe 5 in response to the opening of the hot water supply valve 7.
[0004]
A pressure relief valve 10 communicating with the tank 2 and the hot water supply pipe 5 is provided in the upper part of the tank 2, and a conduction pipe 11 communicating with the atmosphere is connected to the pressure relief valve 10. When the pressure in the tank 2 rises above a certain level due to the influence of steam, expanded water, etc. in the tank 2, the pressure relief valve 10 is automatically opened at that pressure. An abnormal increase in pressure is prevented.
[0005]
Further, when hot water or sediment in the tank 2 is discharged during cleaning or inspection of the tank 2, the pressure relief valve 10 is manually opened to allow the tank 2 to communicate with the atmosphere. Then, the drain plug 9 of the drain pipe 8 is opened to discharge hot water and sediment in the tank 2.
[0006]
The structure of such a pressure relief valve 10 is shown in FIG. 9, wherein 12 is a valve body, and this valve body 12 is brought into the atmosphere through an inlet 13 communicating with the tank 2 through the hot water supply pipe 5 and the conduction pipe 11. The outlet 15 communicates, and a partition wall 15 is provided between the inlet 13 and the outlet 14, and a valve port 16 is formed in the partition 15. A diaphragm-type valve body 20 is provided in the valve body 12 so as to be able to contact and separate from the valve seat 16a at the periphery of the valve port 16, and the valve body 20 is elastically pressed against the valve seat 16a by a spring 21. The valve port 16 is normally sealed by the valve body 20 with this urging force.
[0007]
A valve shaft 20 is attached to the valve body 20, and one end of the valve shaft 22 passes through a cap 12 a constituting a part of the valve body 12 and protrudes outside the valve body 12, and snaps to the protruding end. An operation lever 24 is rotatably attached via a ring 23.
[0008]
An operation wire 25 is fastened to one end of the operation lever 24, the operation wire 25 is led out through the front cover 1 a of the housing 1, and a knob ring 26 is attached to the lead-out end. It has been.
[0009]
Normally, the valve port 16 of the pressure relief valve 10 is sealed with the valve body 20, but when the pressure in the tank 2 rises above a certain level due to the influence of steam, expanded water or the like when boiling in the tank 2, the pressure is increased. Then, the valve body 20 is pushed against the spring 21, thereby opening the valve port 16, and the inside of the tank 2 is communicated with the atmosphere. With this communication, the pressure in the tank 2 escapes to the outside. Abnormal rise is prevented.
[0010]
On the other hand, when hot water or sediment in the tank 2 is discharged during cleaning or inspection of the tank 2, the front cover 1a of the casing 1 is removed, and the operation lever 24 is manually rotated, so that FIG. The operating lever 24 is set to the operating posture arranged along the axial direction of the valve lift shaft 22 as indicated by a chain line.
[0011]
When the operation lever 24 is rotated, the valve lift shaft 22 is pulled against the spring 21 by the lever action by the operation lever 24, whereby the valve body 20 is separated from the valve seat 16a and the valve port 16 is pulled. Is opened and this open state is maintained.
[0012]
In this open state, the inside of the tank 2 communicates with the atmosphere. Therefore, if the drain plug 9 of the drain pipe 8 is opened in this state, hot water, sediment, etc. in the tank 2 can be discharged through the drain pipe 8. .
[0013]
[Problems to be solved by the invention]
By the way, in this type of hot water storage type hot water heater, scales or the like adhere to the pressure relief valve 10, and the operation of the valve body 20 may be slow or malfunction due to solidification of the scales or the like. Therefore, the user or manager of the water heater is requested to perform an operation check for periodically operating the pressure relief valve 10.
[0014]
This operation chuck is an operation of pulling the operation wire 25 led out to the front surface of the housing 1 several times in small increments, and the spring 21 that elastically biases the pulling force and the valve body 20 in the closing direction. The valve body 20 is repeatedly operated by the mutual action, and this operation prevents the valve body 20 from being solidified by scales or the like.
[0015]
However, if the operation wire 25 is pulled too strongly at the time of this operation check, the operation lever 24 may be rotated to the operation posture arranged along the axial direction of the valve lift shaft 22. In the normal state, the valve port 16 remains open, and the function of the pressure relief valve 10 is lost because the hot water and steam in the boiling water flow out in a disorderly manner.
[0016]
The present invention has been made paying attention to such points, and the object of the present invention is to restrict the rotation range of the operation lever to an appropriate range when checking the operation and leave the valve port open. It is an object of the present invention to provide a pressure relief valve device for a hot water storage hot water heater that does not cause such inconvenience.
[0017]
[Means for Solving the Problems]
The invention of claim 1 includes a tank of a water heater, a valve body provided in the tank and elastically biased in a valve closing direction by a spring, a lift valve shaft interlocking with the valve body, and the lift valve It is pivotally attached to the shaft, and by this action, the valve body is moved away from the valve port against the spring by the action of the lever, and when the rotation reaches a certain angle, In the pressure relief valve device having an operation lever for maintaining a posture, the operation lever has a grip portion on one side with the rotation center position as a boundary, and when the operation lever rotates in one direction. The grip portion abuts against a part of the tank, the rotation range of which is restricted to less than the predetermined angle, and when the operating lever rotates in the reverse direction, the grip portion rotates until the predetermined angle is reached. It is characterized in that it has become possible It is intended.
[0018]
According to the second aspect of the present invention, a valve body elastically urged in a valve closing direction by a spring, a valve lift shaft interlocking with the valve body, and a valve shaft rotatably attached to the valve lift shaft. Accordingly, the pressure relief device includes an operation lever that moves the valve body in a direction away from the valve opening against the spring by the action of the lever and maintains its posture when the rotation reaches a certain angle. In the valve device, an operation wire for rotating the operation lever is attached to the operation lever, and a hook portion bent in a substantially U shape is formed on the operation wire, and the plate portion of the operation lever is formed inside the hook portion. By pulling the operation wire with the end on one end side of the lever, the hook portion restricts the rotation range of the operation lever to be less than the predetermined angle, and the one end side of the plate portion of the operation lever is inside the hook portion. End of There is a control lever by pulling the operating wire in the state without intervention which made it possible to rotate until it reaches the predetermined angle.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
In the case of this embodiment, the mounting posture of the pressure relief valve 10 is in a state where the orientation is changed by 90 ° from the state shown in FIG. 9, and thus the valve lift shaft 22 is arranged substantially vertically. An operation lever 24 is pivotally attached to the upper end portion of the valve lift shaft 22 protruding from the cap 12a of the valve body 12 via a snap ring 23, and the connecting portion between the snap ring 23 and the valve lift shaft 22 is operated. This is the pivot point P of the lever 24.
[0020]
The operation lever 24 has a flat plate portion 27, and a tongue piece 30 that is bent to the opposite side of the rotation fulcrum P is formed at an edge of one end side of the plate portion 27. 31 is drilled.
[0021]
Reference numeral 32 denotes an operation wire made of a metal wire having an appropriate rigidity. This operation wire 32 bends a hook portion 33 bent in a substantially U shape at an end portion on one end side and a ring shape at an end portion on the other end side. The knobs 34 are integrally provided. The hook portion 33 includes an arc-shaped portion 33a that is curved in an arc shape and a straight portion 33b that extends linearly from the arc-shaped portion 33a toward the arrangement side of the knob portion 34.
[0022]
The operation wire 32 is inserted into a through hole 1 b formed in the front cover 1 a of the housing 1 and a through hole 31 formed in the tongue piece 30 of the operation lever 24. The operation wire 32 is disposed on the plate portion 27 of the operation lever 24. In the state of FIG. 1, the hook portion 33 engages with the end portion on one end side of the plate portion 27, and the straight portion of the hook portion 33 is provided. 33 b extends below the plate portion 27. And the base end side of the operation wire 32 in which the knob | pick part 34 was formed protrudes in the outward of the front cover 1a with the margin length.
[0023]
A guide fitting 35 is attached to the inside of the front cover 1a. As shown in FIGS. 2 and 3, the guide fitting 35 is formed with a guide groove 36 at the upper portion and a locking groove 37 at one end edge. A part of the operation wire 32 is slidably fitted in the guide groove 36 and a part of the snap ring 23 is fitted and locked in the locking groove 37.
[0024]
FIG. 1 shows a normal state, and when performing an operation check on the pressure relief valve 10 from this state, an operator picks the knob 34 of the operation wire 32 from the outside of the front cover 1a and brings the operation wire 32 forward. Pull to the side.
[0025]
When the operation wire 32 is pulled toward the front side, as shown in FIG. 4, the operation lever 24 is rotated upward around the fulcrum P by the pulling force, and the lever of the pressure relief valve 10 is rotated by this rotation. The lift shaft 22 is pulled up against the spring in the valve body 12, and the valve body is separated from the valve seat by this operation. Then, when the pull of the operation wire 32 is loosened, the valve lifting shaft 22 is lowered by the elastic force of the spring, and the valve body comes into contact with the valve seat. By repeating such an operation several times, the valve body comes into contact with and separates from the valve seat in small increments, and this contact and separation operation prevents the valve body from being consolidated due to scales or the like.
[0026]
At this time, if the operation wire 32 is pulled strongly toward the front side, the rotation angle of the operation lever 24 increases accordingly. As shown in FIG. 4, before the angle reaches a certain angle, that is, approximately 90 °. The plate portion 27 of the operation lever 24 interposed inside the hook portion 33 abuts on the straight portion 33b of the hook portion 33, and the rotation of the operation lever 24 is regulated to be less than a certain angle by this abutment. Therefore, even if the operation wire 32 is pulled strongly toward the front side, the operation lever 24 does not become an operation posture in which the operation lever 24 is arranged along the axial direction of the valve lift shaft 22.
[0027]
On the other hand, when discharging hot water or sediment in the tank, the operation wire 32 is first pushed into the rear side of the housing 1 from the state shown in FIG. 1 to disengage the hook portion 33 from the plate portion 27 of the operation lever 24. In this state, the operation wire 32 is turned 180 ° in the direction around the axis around the through hole 31 of the tongue piece 30 and inverted, and the hook portion 33 is directed to the upper side of the plate portion 27.
[0028]
Next, the operation wire 32 is drawn toward the front side. When the hook portion 33 is engaged with the tongue piece 30 by this drawing and the operation wire 32 is further drawn, the operation lever 24 is pulled by the operation wire 32 and rotates counterclockwise as shown in FIG. At this time, the operation lever 24 is rotated halfway as shown in FIG. 5A because the plate portion 27 of the operation lever 24 is not interposed inside the hook portion 33 of the operation wire 32. However, the operation is not restricted, and therefore, when the operation wire 32 is pulled toward the front side and pulled out to the front side of the front cover 1a, the operation lever 24 is set at a constant angle as shown in FIG. Until the operation lever 24 is disposed along the axial direction of the valve lift shaft 22, and this state is maintained. By maintaining this posture, the opening of the valve opening in the valve main body 12 is maintained, and the inside of the tank is communicated with the atmosphere, so that hot water and sediment in the tank can be discharged.
[0029]
After the discharge processing work for hot water and sediment in the tank is completed, the operation wire 32 is pushed into the back side of the housing 1 from the state of FIG. By this pushing, the operating lever 24 is pressed by the arc-shaped portion 33a of the hook portion 33 in the operation wire 32 and rotated clockwise to return to the normal state shown in FIG.
[0030]
As described above, when the operation of the pressure relief valve 10 is checked, the rotation range of the operation lever 24 can be restricted to an appropriate range, and the operation check can be performed accurately. During the discharge process, the operation lever 24 can be maintained in a predetermined operating posture by simply rotating and pulling the operation wire 32 in the direction around the axis, and the discharge process work can be performed accurately.
[0031]
When the operating lever 24 is set to the operating posture, the operation can be easily and efficiently performed from the outside of the front cover 1a without removing the front cover 1a.
[0032]
FIG. 6 shows another means for restricting the rotation range of the operation lever 24. In this example, the valve lift shaft 22 is oriented sideways, and a long hole 38 is formed in the operation lever 24 along the longitudinal direction thereof, and the end of the snap ring 23 passes through the long hole 38 to the valve lift shaft 22. Are combined.
[0033]
6A, the operation lever 24 is supported vertically with the snap ring 23 as a fulcrum, and when the operation lever 24 is pulled obliquely upward via the operation wire 41 from this state. As shown in FIG. 6B, the operation lever 24 moves upward by the length of the long hole 38, and the snap ring 23 is disposed at the lower end of the long hole 38. When the operation wire 41 is further pulled, as shown in FIG. 6C, the operation lever 24 rotates counterclockwise with the snap ring 23 disposed at the lower end of the long hole 38 as a fulcrum. As a result, the corner 39 of the operating lever 24 abuts against the surface of the cap 12a, and the lift shaft 22 is pulled by this action as a result of this abutment.
[0034]
At this time, when the operation wire 41 is pulled more strongly, the grip portion 40 of the operation lever 24 contacts the edge of the cap 12a, and the rotation of the operation lever 24 is restricted by this contact.
[0035]
On the other hand, when the operation lever 24 is set in the operating posture along the axial direction of the valve lift shaft 22, the operator grasps the grip portion 40 from the state of FIG. 7 (B), the operation lever 24 is rotated clockwise. By this operation, the operation lever 24 is held in the operating posture, and the valve opening in the valve body 12 is held open.
[0036]
【The invention's effect】
As described above, according to the present invention, when the operation of the pressure relief valve is checked, the rotation range of the operation lever can be regulated to an appropriate range, and therefore the inconvenience that the valve port is left open. And the pressure relief valve can always function normally.
[Brief description of the drawings]
FIG. 1 is a side view showing a normal state of a pressure relief valve device according to an embodiment of the present invention.
FIG. 2 is a plan view of the pressure relief valve device.
FIG. 3 is a front view of a guide fitting in the pressure relief valve device.
FIG. 4 is a side view showing a state when checking the operation of the pressure relief valve device.
FIGS. 5A and 5B are side views sequentially showing the operation when the lift shaft of the pressure relief valve device is set in the operating posture.
FIG. 6 is a side view showing an example of means for restricting the rotation range of the operation lever.
FIGS. 7A and 7B are side views sequentially showing the operation when the operation lever is set to the operating posture.
FIG. 8 is a configuration diagram of a hot water storage type water heater.
FIG. 9 is a cross-sectional view of a conventional pressure relief valve device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Pressure relief valve 12 ... Valve body 16 ... Valve port 20 ... Valve body 21 ... Spring 22 ... Lifting shaft 23 ... Snap ring 24 ... Operation lever 27 ... Plate part 30 ... Tongue piece 31 ... Through-hole 32 ... Operation wire 33 ... Hook part 34 ... Pick part

Claims

A water heater tank, a valve body provided in the tank and elastically energized in the valve closing direction by a spring, a valve shaft that interlocks the valve body, and a valve shaft that is pivotally attached to the valve shaft The lever that moves the valve body away from the valve opening against the spring by the action of the lever by the rotation, and maintains the posture when the rotation reaches a certain angle. A pressure relief valve device comprising:
The operation lever has a grip portion on one side with the rotation center position as a boundary, and when the operation lever rotates in one direction, the grip portion contacts a part of the tank and rotates. The hot water heater is characterized in that a moving range is regulated to be less than the predetermined angle, and when the operating lever rotates in the reverse direction, the operating lever can be rotated until the predetermined angle is reached . Pressure relief valve device.

A valve body elastically urged in a valve closing direction by a spring, a valve shaft that interlocks the valve body, and a valve shaft that is pivotally attached to the valve shaft, and is operated by lever action by the rotation. In the pressure relief valve device provided with an operation lever that moves the valve body in a direction away from the valve opening against the valve opening and maintains its posture when the rotation reaches a certain angle,
An operation wire for rotating the operation lever is attached to the operation lever, and a hook portion that is bent in a substantially U shape is formed on the operation wire, and one end side of the plate portion of the operation lever is formed inside the hook portion. By pulling the operating wire with the end portion interposed, the pivoting range of the operating lever is regulated to less than the predetermined angle by the hook portion, and the end portion on one end side of the plate portion of the operating lever is inside the hook portion. A pressure relief valve device for a hot water storage type hot water heater, characterized in that an operation lever can be rotated until the predetermined angle is reached by pulling an operation wire without being interposed.