JP2013167308A

JP2013167308A - Air valve device

Info

Publication number: JP2013167308A
Application number: JP2012031194A
Authority: JP
Inventors: Shigeru Ikeda; 茂池田; Takeshi Ueno; 岳志上野; Makoto Usui; 真琴臼井; Kazumi Tajiri; 和美田尻
Original assignee: Kubota Corp
Current assignee: Kubota Corp
Priority date: 2012-02-16
Filing date: 2012-02-16
Publication date: 2013-08-29

Abstract

PROBLEM TO BE SOLVED: To provide an air valve device capable of preventing damage of an air valve, even if the device is subjected to strong vibration such as an earthquake disaster.SOLUTION: In an air valve device, an openable/closable air hole 17 is formed at the upper part of a valve box 8, a communication hole 16 in communication with a pipe conduit is formed at the lower part of the valve box 8, an in-valve box passage 18 in communication with the air hole 17 and the communication hole 16, and an ascendable/descendable float 9 are arranged in the valve box 8, and the air hole 17 is closed by a lift of the float 9. Also in the air valve device, there is arranged a pressure-release means 30 for releasing pressure in the valve box 8 to the outside when the pressure in the valve box 8 is raised to regulated pressure or higher.

Description

本発明は、例えば水道用管路等の管路に設けられる空気弁装置に関する。 The present invention relates to an air valve device provided in a pipeline such as a water pipeline.

従来、この種の空気弁装置としては、例えば図１５に示すように、埋設された水道用管路１０１に接続されるものがある。空気弁装置１０２は、水道用管路１０１の上方に配置される空気弁１０３と、空気弁１０３と水道用管路１０１との間に接続される補修弁１０４とを有している。 Conventionally, as this type of air valve device, for example, as shown in FIG. 15, there is one which is connected to a buried water pipe 101. The air valve device 102 includes an air valve 103 disposed above the water pipe 101 and a repair valve 104 connected between the air valve 103 and the water pipe 101.

空気弁１０３は、弁箱１０６の上端部に大径空気孔１０７が形成され、弁箱１０６の下部に、管路１０１に連通する連通孔１０８が形成されている。弁箱１０６内には、大径空気孔１０７を開閉するための昇降自在な遊動弁体１０９と、遊動弁体１０９の中央部に形成した小径空気孔１１０を開閉するための昇降自在なフロート１１１と、遊動弁体１０９およびフロート１１１を昇降方向に案内する円筒状の案内枠体１１２とが設けられている。尚、フロート１１１は中空構造の金属製の球体である。 In the air valve 103, a large-diameter air hole 107 is formed at the upper end of the valve box 106, and a communication hole 108 communicating with the pipe line 101 is formed at the lower part of the valve box 106. In the valve box 106, an up and down free floating valve body 109 for opening and closing the large diameter air hole 107 and an up and down freely floating float 111 for opening and closing a small diameter air hole 110 formed in the center of the free valve body 109 are provided. And a cylindrical guide frame body 112 for guiding the floating valve body 109 and the float 111 in the up-and-down direction. The float 111 is a hollow metal sphere.

遊動弁体１０９の上部には、小径空気孔１１０と連通するチューブ棒１１３が固着されている。弁箱１０６の上方には噴水そらせ板１１４が設けられ、噴水そらせ板１１４上にはガイド筒体１１５が立設されている。チューブ棒１１３にはリング１１６が固着され、ガイド筒体１１５には雌ねじ部１１７が形成され、雌ねじ部１１７にはねじ部材１１８が螺合している。ガイド筒体１１５とチューブ棒１１３との間の間隙にはばね１１９が挿入され、ばね１１９はリング１１６とねじ部材１１８との間に介装されている。 A tube rod 113 communicating with the small-diameter air hole 110 is fixed to the upper part of the idle valve body 109. A fountain baffle 114 is provided above the valve box 106, and a guide cylinder 115 is erected on the fountain baffle 114. A ring 116 is fixed to the tube rod 113, a female thread portion 117 is formed in the guide cylinder 115, and a screw member 118 is screwed into the female thread portion 117. A spring 119 is inserted into the gap between the guide cylinder 115 and the tube rod 113, and the spring 119 is interposed between the ring 116 and the screw member 118.

これによると、水道用管路１０１から弁箱１０６内に水が流入して水位が変化することにより、それに連動して遊動弁体１０９及びフロート１１１が昇降し、遊動弁体１０９は、大径空気孔１０７を開閉して、充水時の排気と排水時の空気導入を行うことができる。また、フロート１１１は、遊動弁体１０９の小径空気孔１１０を開閉して、大径空気孔１０７を閉鎖した充水状態で弁箱１０６内に溜まった空気を自動的に排気することができる。 According to this, when water flows into the valve box 106 from the water pipe 101 and the water level changes, the floating valve body 109 and the float 111 are moved up and down in conjunction with this, and the floating valve body 109 has a large diameter. The air hole 107 can be opened and closed to perform exhaust during filling and air introduction during drainage. Further, the float 111 can automatically exhaust the air accumulated in the valve box 106 in a filled state in which the small-diameter air hole 110 of the floating valve element 109 is opened and closed and the large-diameter air hole 107 is closed.

また、ねじ部材１１８を回して昇降させることにより、ばね１１９の付勢力が調整され、遊動弁体１０９の閉鎖速度を自在に変更することができる。
尚、上記のような空気弁１０３は例えば下記特許文献１に記載されている。 Further, by turning the screw member 118 up and down, the biasing force of the spring 119 is adjusted, and the closing speed of the floating valve body 109 can be freely changed.
The air valve 103 as described above is described in, for example, Patent Document 1 below.

また、水道用管路１０１は複数本のダクタイル鉄管等の管を接合してなり、管同士の接合部分は一方の管の挿口を他方の管の受口に挿入した耐震継手構造を有している。地震時の大きな地盤変動の際、挿口が受口に対して管軸方向にスライドすることで、管継手部が管軸方向に伸縮し、挿口が限界まで伸び出ると、挿口突部が受口内のロックリングに引っ掛り、離脱防止機構が機能する。 Further, the water pipe 101 is formed by joining a plurality of ductile iron pipes or the like, and the joint portion between the pipes has an earthquake-resistant joint structure in which the insertion port of one tube is inserted into the receiving port of the other tube. ing. When a large ground change occurs during an earthquake, the insertion slot slides in the direction of the tube axis relative to the reception port, so that the pipe joint expands and contracts in the direction of the tube axis. Is caught by the lock ring in the receiving port, and the detachment prevention mechanism functions.

特開平９−１４４９４０JP-A-9-144940

しかしながら上記の従来形式では、東日本大震災の際、想定を超えた非常に強い揺れのため、空気弁１０３のフロート１１１が凹むといった不具合が発生した。この不具合の原因は、強い揺れにより水道用管路１０１の管継手部が伸縮することで、管の損傷が防止されるのであるが、管継手部が短縮された際に水道用管路１０１内の圧力が一時的に異常に上昇し、この異常な高圧が空気弁１０３の弁箱１０６内に伝播し、中空構造のため外圧に弱いフロート１１１が異常な高圧に耐えられずに凹んだものと推測される。尚、このような不具合発生のメカニズムは、現在のところ推測の域を出ず、今後の解明が待たれる。 However, in the above-mentioned conventional format, there was a problem that the float 111 of the air valve 103 was recessed due to the extremely strong shaking exceeding the assumption during the Great East Japan Earthquake. The cause of this problem is that the pipe joint portion of the water pipe 101 is expanded and contracted due to strong shaking, so that damage to the pipe is prevented. However, when the pipe joint is shortened, And the abnormally high pressure propagates into the valve box 106 of the air valve 103, and the float 111 that is weak against the external pressure is recessed without being able to withstand the abnormal high pressure. Guessed. In addition, the mechanism of the occurrence of such a problem does not go out of speculation at present, and further elucidation is awaited.

本発明は、震災等の強い揺れに見舞われても、空気弁の損傷を防ぐことが可能な空気弁装置を提供することを目的とする。 An object of the present invention is to provide an air valve device that can prevent damage to an air valve even when it is hit by a strong shaking such as an earthquake disaster.

上記目的を達成するために、本第１発明は、弁箱の上部に、開閉自在な空気孔が形成され、
弁箱の下部に、管路に連通する連通孔が形成され、
弁箱内に、空気孔と連通孔とに通じる弁箱内流路と、昇降自在なフロートとが設けられ、
フロートの上昇によって空気孔が閉じられる空気弁装置であって、
弁箱内の圧力が規定圧力以上になると、弁箱内の圧力を外部へ逃す圧力逃し手段が備えられているものである。 In order to achieve the above object, according to the first aspect of the present invention, an openable and closable air hole is formed in the upper part of the valve box.
A communication hole communicating with the pipe line is formed at the bottom of the valve box,
In the valve box, a flow path in the valve box that leads to the air hole and the communication hole, and a float that can be raised and lowered are provided,
An air valve device in which an air hole is closed by raising a float,
When the pressure in the valve box becomes equal to or higher than the specified pressure, pressure relief means for releasing the pressure in the valve box to the outside is provided.

これによると、地震等の揺れにより、管路内の圧力が一時的に異常に上昇し、この異常な高圧が空気弁の弁箱内に伝播し、弁箱内の圧力が規定圧力以上になると、圧力逃し手段が弁箱内の圧力を外部へ逃すため、弁箱内の圧力が低下し、フロート等の損傷を防止することができる。 According to this, when the pressure in the pipeline temporarily rises abnormally due to shaking such as an earthquake, and this abnormal high pressure propagates into the valve box of the air valve, the pressure in the valve box exceeds the specified pressure. Since the pressure relief means releases the pressure in the valve box to the outside, the pressure in the valve box is lowered and damage to the float and the like can be prevented.

本第２発明における空気弁装置は、圧力逃し手段は、弁箱に形成されて弁箱の内外に連通する逃し通路と、通路閉塞機構とを有し、
通路閉塞機構は、弁箱内の圧力が規定圧力未満では逃し通路を閉じた状態を維持し、規定圧力以上では逃し通路を開くものである。 In the air valve device according to the second aspect of the invention, the pressure relief means includes a relief passage formed in the valve box and communicating with the inside and outside of the valve box, and a passage closing mechanism.
The passage closing mechanism maintains the state where the relief passage is closed when the pressure in the valve box is less than the prescribed pressure, and opens the relief passage when the pressure is above the prescribed pressure.

これによると、弁箱内の圧力が規定圧力以上になると、通路閉塞機構が逃し通路を開いて弁箱内の圧力を弁箱の外部へ逃すため、弁箱内の圧力が低下し、フロート等の損傷を防止することができる。 According to this, when the pressure in the valve box exceeds the specified pressure, the passage blockage mechanism opens the escape passage and releases the pressure in the valve box to the outside of the valve box, so the pressure in the valve box decreases, floats, etc. Can prevent damage.

本第３発明における空気弁装置は、弁箱の下部に接続部材が連結され、
接続部材内に、管路内と連通孔とに通じる接続流路が設けられ、
圧力逃し手段は、接続部材に形成されて接続部材の内外に連通する逃し通路と、通路閉塞機構とを有し、
通路閉塞機構は、接続流路内の圧力が規定圧力未満では逃し通路を閉じた状態を維持し、規定圧力以上では逃し通路を開くものである。 In the air valve device according to the third aspect of the present invention, a connecting member is connected to the lower part of the valve box,
In the connection member, a connection flow path leading to the inside of the pipe line and the communication hole is provided,
The pressure relief means includes a relief passage formed in the connection member and communicating with the inside and outside of the connection member, and a passage closing mechanism.
The passage closing mechanism maintains the state where the escape passage is closed when the pressure in the connection flow path is lower than the specified pressure, and opens the release passage when the pressure is higher than the specified pressure.

これによると、地震等の揺れにより、管路内の圧力が一時的に異常に上昇し、この異常な高圧が接続部材の接続流路を通って空気弁の弁箱内に伝播し、この際、接続流路内の圧力が規定圧力以上になると、通路閉塞機構が逃し通路を開いて接続流路の圧力を接続部材の外部へ逃すため、接続流路と共に弁箱内の圧力が低下し、フロート等の損傷を防止することができる。 According to this, the pressure in the pipeline temporarily rises abnormally due to shaking such as an earthquake, and this abnormal high pressure propagates through the connection flow path of the connection member into the valve box of the air valve. When the pressure in the connection channel becomes equal to or higher than the specified pressure, the passage blockage mechanism opens the escape channel and releases the pressure in the connection channel to the outside of the connection member. Damage to the float or the like can be prevented.

本第４発明における空気弁装置は、弁箱の下部に接続部材が連結され、
接続部材内に、管路内と連通孔とに通じる接続流路が設けられ、
弁箱は接続部材に対して昇降可能に連結され、
圧力逃し手段は、弁箱内の圧力が規定圧力以上になると、弁箱を上昇させて弁箱と接続部材との間を開く機能を有するものである。 In the air valve device according to the fourth aspect of the present invention, a connecting member is coupled to the lower part of the valve box,
In the connection member, a connection flow path leading to the inside of the pipe line and the communication hole is provided,
The valve box is connected to the connecting member so as to be movable up and down,
The pressure relief means has a function of raising the valve box and opening the valve box and the connection member when the pressure in the valve box becomes equal to or higher than a specified pressure.

これによると、地震等の揺れにより、管路内の圧力が一時的に異常に上昇し、この異常な高圧が接続部材の接続流路を通って空気弁の弁箱内に伝播し、弁箱内の圧力が規定圧力以上になると、圧力逃し手段によって弁箱が上昇し、弁箱と接続部材との間が開いて、弁箱と接続部材との間に隙間が形成され、この隙間から弁箱内の圧力が外部へ逃げるため、弁箱内の圧力が低下し、フロート等の損傷を防止することができる。 According to this, the pressure in the pipeline temporarily rises abnormally due to shaking such as an earthquake, and this abnormal high pressure propagates through the connection flow path of the connection member into the valve box of the air valve, When the internal pressure exceeds the specified pressure, the valve box is raised by the pressure relief means, the gap between the valve box and the connecting member is opened, and a gap is formed between the valve box and the connecting member. Since the pressure in the box escapes to the outside, the pressure in the valve box is reduced, and damage such as float can be prevented.

本第５発明における空気弁装置は、弁箱内に、フロートによって昇降して空気孔を開閉する遊動弁体が設けられ、
弁箱は、筒状の胴部と、胴部の上部に設けられた昇降自在な蓋部と有し、
空気孔は蓋部に形成され、
圧力逃し手段は、弁箱内の圧力が規定圧力以上になると、弁箱の蓋部を胴部から上昇させて蓋部と胴部との間を開く機能を有するものである。 The air valve device according to the fifth aspect of the present invention is provided with a floating valve body that moves up and down by a float to open and close an air hole in the valve box,
The valve box has a cylindrical barrel and a lid that can be raised and lowered provided on the upper portion of the barrel,
Air holes are formed in the lid,
The pressure relief means has a function of raising the lid portion of the valve box from the trunk portion and opening the lid portion and the trunk portion when the pressure in the valve box becomes equal to or higher than a specified pressure.

これによると、管路から弁箱内に水が流入すると、フロートの浮力により遊動弁体が上昇し、弁箱内が満水状態になると、遊動弁体が空気孔を閉じ、水の流出を防ぐ。
地震等の揺れにより、管路内の圧力が一時的に異常に上昇し、この異常な高圧が空気弁の弁箱内に伝播し、弁箱内の圧力が規定圧力以上になると、圧力逃し手段によって弁箱の蓋部が上昇し、蓋部と胴部との間が開いて、蓋部と胴部との間に隙間が形成され、この隙間から弁箱内の圧力が外部へ逃げるため、弁箱内の圧力が低下し、フロート等の損傷を防止することができる。 According to this, when water flows into the valve box from the pipe line, the floating valve body rises due to the buoyancy of the float, and when the inside of the valve box becomes full, the floating valve body closes the air hole and prevents the outflow of water. .
When the pressure in the pipeline temporarily rises abnormally due to shaking such as an earthquake and this abnormal high pressure propagates into the valve box of the air valve, and the pressure in the valve box exceeds the specified pressure, pressure relief means The lid of the valve box rises, the gap between the lid and the trunk opens, a gap is formed between the lid and the trunk, and the pressure in the valve box escapes to the outside from this gap, The pressure in the valve box decreases, and damage such as float can be prevented.

本第６発明における空気弁装置は、弁箱内に、フロートによって昇降して空気孔を開閉する遊動弁体が設けられ、
遊動弁体に、フロートの昇降によって開閉される小空気孔が形成され、
圧力逃し手段は、遊動弁体に形成されて遊動弁体の内外に連通する逃し通路と、通路閉塞機構とを有し、
通路閉塞機構は、弁箱内の圧力が規定圧力未満では逃し通路を閉じた状態を維持し、規定圧力以上では逃し通路を開くものである。 In the air valve device according to the sixth aspect of the present invention, a floating valve body that is lifted and lowered by a float to open and close the air hole is provided in the valve box,
A small air hole that is opened and closed by raising and lowering the float is formed in the floating valve body,
The pressure relief means has a relief passage formed in the idle valve body and communicating with the inside and outside of the idle valve body, and a passage closing mechanism,
The passage closing mechanism maintains the state where the relief passage is closed when the pressure in the valve box is less than the prescribed pressure, and opens the relief passage when the pressure is above the prescribed pressure.

これによると、管路から弁箱内に水が流入して水位が変化することにより、それに連動して遊動弁体及びフロートが昇降し、遊動弁体は、空気孔を開閉して、充水時の排気と排水時の空気導入を行うことができる。また、フロートは、遊動弁体の小空気孔を開閉して、空気孔を閉鎖した充水状態で弁箱内に溜まった空気を自動的に排気することができる。 According to this, when water flows from the pipe line into the valve box and the water level changes, the floating valve body and the float move up and down in conjunction with it, and the floating valve body opens and closes the air holes to fill the water. It is possible to carry out air exhaust during exhaust and drainage. Moreover, the float can open and close the small air hole of the floating valve body, and can automatically exhaust the air accumulated in the valve box in a filled state where the air hole is closed.

地震等の揺れにより、管路内の圧力が一時的に異常に上昇し、この異常な高圧が空気弁の弁箱内に伝播し、弁箱内の圧力が規定圧力以上になると、通路閉塞機構が逃し通路を開いて弁箱内の圧力を遊動弁体の逃し通路から外部へ逃すため、弁箱内の圧力が低下し、フロート等の損傷を防止することができる。 If the pressure in the pipeline temporarily rises abnormally due to shaking such as an earthquake, and this abnormal high pressure propagates into the valve box of the air valve, the pressure in the valve box exceeds the specified pressure. However, since the relief passage is opened and the pressure in the valve box is released from the relief passage of the floating valve body to the outside, the pressure in the valve box is lowered, and damage such as float can be prevented.

以上のように本発明によると、震災等の強い揺れに見舞われて、空気弁の弁箱内の圧力が一時的に異常に上昇しても、弁箱内の圧力を外部へ逃すことができるため、フロート等の部品の損傷を防ぐことができる。 As described above, according to the present invention, even if the pressure in the valve box of the air valve temporarily rises abnormally due to a strong shaking such as an earthquake disaster, the pressure in the valve box can be released to the outside. Therefore, damage to parts such as a float can be prevented.

本発明の第１の実施の形態における空気弁装置の断面図である。It is sectional drawing of the air valve apparatus in the 1st Embodiment of this invention. 同、空気弁装置の空気弁の断面図である。It is sectional drawing of the air valve of an air valve apparatus equally. 同、空気弁の遊動弁体の拡大断面図である。It is an expanded sectional view of the floating valve body of an air valve. 同、空気弁の圧力逃し弁の断面図である。It is sectional drawing of the pressure relief valve of an air valve. 本発明の第２の実施の形態における空気弁装置の空気弁の断面図である。It is sectional drawing of the air valve of the air valve apparatus in the 2nd Embodiment of this invention. 同、空気弁の圧力逃し手段の断面図であり、（ａ）は圧力逃し手段が閉状態、（ｂ）は圧力逃し手段が開状態を示す。FIG. 4 is a cross-sectional view of the pressure relief means of the air valve, where (a) shows the pressure relief means in a closed state and (b) shows the pressure relief means in an open state. 本発明の第３の実施の形態における空気弁装置の断面図である。It is sectional drawing of the air valve apparatus in the 3rd Embodiment of this invention. 同、空気弁装置の側面図である。2 is a side view of the air valve device. FIG. 同、空気弁装置の空気弁と補修弁との連結部分の断面図であり、（ａ）は連結部材が閉状態、（ｂ）は連結部材が開状態を示す。It is sectional drawing of the connection part of the air valve of an air valve apparatus and a repair valve, (a) shows a connection member in a closed state, (b) shows a connection member in an open state. 本発明の第４の実施の形態における空気弁の断面図であり、圧力逃し手段が閉状態を示す。It is sectional drawing of the air valve in the 4th Embodiment of this invention, and a pressure relief means shows a closed state. 同、空気弁の断面図であり、圧力逃し手段が開状態を示す。FIG. 4 is a cross-sectional view of the air valve, showing a state in which the pressure relief means is open. 同、空気弁の圧力逃し手段の拡大図であり、（ａ）は圧力逃し手段が閉状態、（ｂ）は圧力逃し手段が開状態を示す。FIG. 4 is an enlarged view of the pressure relief means of the air valve, where (a) shows the pressure relief means in a closed state and (b) shows the pressure relief means in an open state. 本発明の第５の実施の形態における空気弁の断面図である。It is sectional drawing of the air valve in the 5th Embodiment of this invention. 同、空気弁の圧力逃し手段の拡大断面図であり、（ａ）は圧力逃し手段が閉状態、（ｂ）は圧力逃し手段が開状態を示す。FIG. 4 is an enlarged cross-sectional view of the pressure relief means of the air valve, where (a) shows the pressure relief means in a closed state and (b) shows the pressure relief means in an open state. 従来の空気弁装置の断面図である。It is sectional drawing of the conventional air valve apparatus.

以下、本発明における実施の形態を、図面を参照して説明する。
（第１の実施の形態）
先ず、第１の実施の形態を以下に説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
First, a first embodiment will be described below.

図１に示すように、１は地中に埋設された水道管路（管路の一例）であり、この水道管路１は挿口と受口を有する複数本の管同士を接合してなるものである。管同士の接合部分は、従来と同様に、一方の管の挿口を他方の管の受口に挿入した耐震継手構造を有している。 As shown in FIG. 1, 1 is a water pipe (an example of a pipe) buried in the ground, and this water pipe 1 is formed by joining a plurality of pipes having an insertion port and a receiving port. Is. The joint portion between the tubes has an earthquake-resistant joint structure in which the insertion port of one tube is inserted into the receiving port of the other tube, as in the prior art.

水道管路１はその途中にＴ字管２を備えており、Ｔ字管２には、空気弁装置５が設けられている。空気弁装置５は、空気弁６と、空気弁６とＴ字管２との間に取付けられた補修弁７（接続部材の一例）とを有している。 The water pipe 1 is provided with a T-shaped tube 2 in the middle thereof, and the T-shaped tube 2 is provided with an air valve device 5. The air valve device 5 includes an air valve 6 and a repair valve 7 (an example of a connecting member) attached between the air valve 6 and the T-shaped tube 2.

空気弁６の構成を以下に説明する。
図１，図２に示すように、空気弁６は、弁箱８と、弁箱８内に設けられたフロート９と遊動弁体１０と案内枠体１１と、弁箱８の上方に設けられたカバー１２とを有している。弁箱８は、円筒状の胴部８ａと、この胴部８ａの上端部に複数本の第１のボルト１４を介して取付けられた円環状の蓋部８ｂとを有している。胴部８ａの下端部には、取付フランジ１５と、水道管路１のＴ字管２に連通する連通孔１６とが設けられている。また、蓋部８ｂには、弁箱８の内部と外部とに連通する大空気孔１７（空気孔の一例）が形成されている。蓋部８ｂの内周部下面には大空気孔用弁座１９が設けられている。弁箱８内には、連通孔１６と大空気孔１７とに通じる弁箱内流路１８が形成されている。尚、第１のボルト１４は、蓋部８ｂに形成された貫通孔２０に挿通され、胴部８ａに螺合されている。 The configuration of the air valve 6 will be described below.
As shown in FIGS. 1 and 2, the air valve 6 is provided above the valve box 8, the float 9 provided in the valve box 8, the floating valve body 10, the guide frame body 11, and the valve box 8. And a cover 12. The valve box 8 has a cylindrical barrel portion 8a and an annular lid portion 8b attached to the upper end portion of the barrel portion 8a via a plurality of first bolts 14. An attachment flange 15 and a communication hole 16 communicating with the T-shaped pipe 2 of the water pipe 1 are provided at the lower end of the body portion 8a. In addition, a large air hole 17 (an example of an air hole) communicating with the inside and the outside of the valve box 8 is formed in the lid portion 8b. A large air hole valve seat 19 is provided on the lower surface of the inner peripheral portion of the lid portion 8b. In the valve box 8, an in-valve box flow path 18 communicating with the communication hole 16 and the large air hole 17 is formed. The first bolt 14 is inserted through a through hole 20 formed in the lid portion 8b and screwed into the body portion 8a.

遊動弁体１０は、昇降することにより大空気孔１７を開閉する弁体であり、中央部に、上方へ突出する突状部１０ａを有し、突状部１０ａの周囲に平坦部１０ｂ（シート部）を有し、下部に、フロート９を受け止める下向きの凹部１０ｃを有している。図２の実線および図３で示すように、遊動弁体１０は、閉位置まで上昇すると、平坦部１０ｂが大空気孔用弁座１９に当接することにより、大空気孔１７を閉じる。 The floating valve body 10 is a valve body that opens and closes the large air hole 17 by moving up and down. The floating valve body 10 has a protruding portion 10a protruding upward at a central portion, and a flat portion 10b (sheet) around the protruding portion 10a. Part) and a downwardly recessed part 10c for receiving the float 9 at the lower part. As shown in the solid line in FIG. 2 and FIG. 3, when the floating valve body 10 is raised to the closed position, the flat portion 10 b comes into contact with the large air hole valve seat 19 to close the large air hole 17.

遊動弁体１０の突状部１０ａには、遊動弁体１０の内外に連通する小空気孔２１が形成されている。尚、遊動弁体１０は、円筒状の小空気孔用弁座２２と、上方から小空気孔用弁座２２に嵌め込まれて小空気孔用弁座２２を下方へ押付けるはめ輪２３と、突状部１０ａにねじ込まれてはめ輪２３を固定する押えねじ２４とを有している。また、小空気孔２１は、大空気孔１７よりも小径であり、小空気孔用弁座２２とはめ輪２３と押えねじ２４とを貫通している。 A small air hole 21 communicating with the inside and outside of the floating valve body 10 is formed in the protruding portion 10 a of the floating valve body 10. The floating valve body 10 includes a cylindrical small air hole valve seat 22 and a fitting wheel 23 that is fitted into the small air hole valve seat 22 from above and presses the small air hole valve seat 22 downward. It has a presser screw 24 that is screwed into the projecting portion 10 a and fixes the ferrule 23. The small air hole 21 has a smaller diameter than the large air hole 17 and passes through the small air hole valve seat 22, the snap ring 23, and the presser screw 24.

フロート９は、遊動弁体１０を昇降させる金属製で中空構造の球体であり、昇降することによって遊動弁体１０の小空気孔２１を開閉する。
案内枠体１１は、遊動弁体１０およびフロート９を昇降方向（上下方向）に案内するものであり、大空気孔１７に連通する上端開口部１１ａを有する円筒状に形成され、且つ、底部が半球状に湾曲してフロート９を保持している。また、案内枠体１１の側面上部には、案内枠体１１の内外面に開口する複数の流通孔２５が形成されている。さらに、案内枠体１１の最底部には小開孔２６が形成されている。 The float 9 is a metal sphere having a hollow structure that moves the floating valve body 10 up and down, and opens and closes the small air holes 21 of the floating valve body 10 by moving up and down.
The guide frame body 11 guides the floating valve body 10 and the float 9 in the up-and-down direction (vertical direction), is formed in a cylindrical shape having an upper end opening portion 11a communicating with the large air hole 17, and has a bottom portion. The float 9 is held in a hemispherical shape. A plurality of flow holes 25 that open to the inner and outer surfaces of the guide frame 11 are formed in the upper part of the side surface of the guide frame 11. Further, a small opening 26 is formed at the bottom of the guide frame 11.

また、案内枠体１１は、上端部に、径方向外向きに張り出した鍔部２７を有している。鍔部２７は胴部８ａの上端内周部に形成された印籠部３２（嵌込部）に上方から嵌め込まれている。尚、鍔部２７は胴部８ａの印籠部３２と蓋部８ｂとによって上下方向から挟まれており、蓋部８ｂと鍔部２７との上下間は大空気孔用弁座１９によってシールされている。また、鍔部２７の下面が印籠部３２の底面に面接触していることにより、鍔部２７と胴部８ａとの間がシールされている。 Further, the guide frame 11 has a flange portion 27 protruding outward in the radial direction at the upper end portion. The collar part 27 is fitted from above into a stamping part 32 (fitting part) formed on the inner periphery of the upper end of the body part 8a. The flange portion 27 is sandwiched between the seal portion 32 and the lid portion 8b of the body portion 8a from above and below, and the vertical space between the lid portion 8b and the flange portion 27 is sealed by the large air hole valve seat 19. Yes. Moreover, since the lower surface of the collar part 27 is in surface contact with the bottom surface of the stamping part 32, the gap between the collar part 27 and the body part 8a is sealed.

カバー１２は、複数の第２のボルト２８を介して弁箱８の蓋部８ｂに取り付けられており、大空気孔１７の上方を覆っている。第２のボルト２８は第１のボルト１４に螺合されている。尚、カバー１２と弁箱８との間には、大空気孔１７と外部とに連通する連通空間２９が形成されている。 The cover 12 is attached to the lid portion 8 b of the valve box 8 via a plurality of second bolts 28 and covers the upper portion of the large air hole 17. The second bolt 28 is screwed to the first bolt 14. A communication space 29 communicating with the large air hole 17 and the outside is formed between the cover 12 and the valve box 8.

空気弁６の弁箱８の胴部８ａには、弁箱８内の圧力が規定圧力以上になると、弁箱８内の圧力を外部へ逃す圧力逃し弁３０（圧力逃し手段の一例）が備えられている。図２，図４に示すように、圧力逃し弁３０は、内部流路３０ａを開閉するステム３０ｂと、ステム３０ｂを閉方向Ｓへ付勢するスプリング３０ｃ（弾性体の一例）とを内蔵しており、ステム３０ｂに規定圧力以上の圧力が作用すると、図４の仮想線で示すように、スプリング３０ｃが圧縮されて内部流路３０ａが開くように構成されている。 The body 8a of the valve box 8 of the air valve 6 is provided with a pressure relief valve 30 (an example of pressure relief means) that releases the pressure in the valve box 8 to the outside when the pressure in the valve box 8 exceeds a specified pressure. It has been. 2 and 4, the pressure relief valve 30 includes a stem 30b that opens and closes the internal flow path 30a and a spring 30c (an example of an elastic body) that biases the stem 30b in the closing direction S. When the pressure higher than the specified pressure is applied to the stem 30b, the spring 30c is compressed and the internal flow path 30a is opened as shown by the phantom line in FIG.

以下、上記構成における作用を説明する。
図１に示すように、補修弁７を開き、水道管路１内に充水することにより、水道管路１内の空気が、補修弁７を通り、空気弁６の連通孔１６から弁箱８と案内枠体１１との間の弁箱内流路１８を流れ、流通孔２５を通って大空気孔１７から流出し、連通空間２９を流れて外部へ排気される。この際、フロート９が自重により案内枠体１１内の底部に下降すると共に、遊動弁体１０が自重により開位置まで下降して大空気孔１７を開放している。 Hereinafter, the operation of the above configuration will be described.
As shown in FIG. 1, when the repair valve 7 is opened and the water pipe 1 is filled with water, the air in the water pipe 1 passes through the repair valve 7 and from the communication hole 16 of the air valve 6 to the valve box. 8 flows in the valve box flow path 18 between the guide frame 11 and the flow hole 25, flows out from the large air hole 17, flows through the communication space 29, and is exhausted to the outside. At this time, the float 9 descends to the bottom of the guide frame 11 due to its own weight, and the floating valve element 10 descends to the open position due to its own weight, thereby opening the large air hole 17.

水道管路１内の充水量が増加し、水が空気弁６の連通孔１６から弁箱８内に流入すると、弁箱８内の水位の上昇に応じてフロート９が上昇し、フロート９の浮力によって遊動弁体１０が上昇する。図２の実線で示すように、弁箱８内が満水になると、遊動弁体１０が閉位置まで上昇して大空気孔１７を閉じると共に、フロート９が小空気孔２１を閉じ、これにより、水の流出が阻止される。 When the amount of water in the water pipe 1 increases and water flows into the valve box 8 from the communication hole 16 of the air valve 6, the float 9 rises according to the rise in the water level in the valve box 8. The floating valve body 10 is raised by buoyancy. As shown by the solid line in FIG. 2, when the inside of the valve box 8 is full, the floating valve body 10 rises to the closed position and closes the large air hole 17, and the float 9 closes the small air hole 21. Water outflow is prevented.

その後、水道管路１内を流れている水に含まれる少量の空気が水道管路１内から空気弁６の弁箱８内に流入し、弁箱８内に空気が溜まって水位が低下すると、図２の仮想線で示すように、フロート９が自重により下降して小空気孔２１を開く。これにより、弁箱８内の空気が、小空気孔２１を通り、連通空間２９から外部へ排気される。 Thereafter, when a small amount of air contained in the water flowing in the water pipe 1 flows into the valve box 8 of the air valve 6 from the water pipe 1 and the air accumulates in the valve box 8 and the water level decreases. 2, the float 9 descends due to its own weight and opens the small air hole 21 as indicated by a virtual line in FIG. As a result, the air in the valve box 8 passes through the small air holes 21 and is exhausted from the communication space 29 to the outside.

また、水道管路１内の水を排水すると、弁箱８内の水位が低下し、図１に示すように、フロート９が自重により案内枠体１１内の底部に下降すると共に、遊動弁体１０が自重により開位置まで下降して大空気孔１７を開放する。これにより、外部の空気が、連通空間２９から大空気孔１７を通り、流通孔２５を経て弁箱８と案内枠体１１との間の弁箱内流路１８を流れ、連通孔１６から水道管路１内に吸気される。 When the water in the water pipe 1 is drained, the water level in the valve box 8 is lowered, and the float 9 is lowered to the bottom in the guide frame 11 by its own weight as shown in FIG. 10 descends to the open position by its own weight and opens the large air hole 17. As a result, external air flows from the communication space 29 through the large air hole 17, flows through the circulation hole 25, and flows through the valve box flow path 18 between the valve box 8 and the guide frame body 11, and from the communication hole 16 to the tap water. The air is sucked into the pipe 1.

通常時は、図２の実線で示すように、弁箱８内が満水状態で、遊動弁体１０が大空気孔１７を閉じると共にフロート９が小空気孔２１を閉じた状態になっている。地震等が発生して非常に強い揺れに襲われ、水道管路１内の圧力が一時的に異常に上昇し、この異常な高圧が空気弁６の弁箱８内に伝播し、弁箱８内の圧力が規定圧力以上になると、図４の仮想線で示すように、圧力逃し弁３０のステム３０ｂがスプリング３０ｃの付勢力に抗して開方向Ｏへ移動し内部流路３０ａを開き、弁箱８内の圧力を外部へ逃す。このため、弁箱８内の圧力が低下し、フロート９等の損傷を防止することができる。 In a normal state, as shown by a solid line in FIG. 2, the inside of the valve box 8 is full, the floating valve body 10 closes the large air hole 17, and the float 9 closes the small air hole 21. Due to an earthquake or the like, a very strong shake is attacked, and the pressure in the water pipe 1 temporarily rises abnormally. This abnormal high pressure propagates into the valve box 8 of the air valve 6, and the valve box 8 When the internal pressure exceeds the specified pressure, as shown by the phantom line in FIG. 4, the stem 30b of the pressure relief valve 30 moves in the opening direction O against the biasing force of the spring 30c to open the internal flow path 30a. The pressure in the valve box 8 is released to the outside. For this reason, the pressure in the valve box 8 falls, and damage to the float 9 etc. can be prevented.

また、弁箱８内の圧力が規定圧力未満に低下すると、図４の実線で示すように、圧力逃し弁３０のステム３０ｂがスプリング３０ｃの付勢力によって閉方向Ｓへ移動し内部流路３０ａを閉じる。尚、通常は、このように内部流路３０ａを閉じた状態に保たれている。 When the pressure in the valve box 8 drops below the specified pressure, as shown by the solid line in FIG. 4, the stem 30b of the pressure relief valve 30 moves in the closing direction S by the urging force of the spring 30c and moves through the internal flow path 30a. close up. Normally, the internal flow path 30a is kept closed as described above.

尚、上記実施の形態では、圧力逃し弁３０を、空気弁６の弁箱８に設けたが、補修弁７の弁箱５１に設けてもよい。この場合、圧力逃し弁３０は補修弁７の弁体５２と空気弁６の連通孔１６との間に位置させるのがよい。 In the above embodiment, the pressure relief valve 30 is provided in the valve box 8 of the air valve 6, but may be provided in the valve box 51 of the repair valve 7. In this case, the pressure relief valve 30 is preferably positioned between the valve body 52 of the repair valve 7 and the communication hole 16 of the air valve 6.

（第２の実施の形態）
次に、第２の実施の形態を以下に説明する。尚、上記第１の実施の形態と共通する内容については、省略する。 (Second Embodiment)
Next, a second embodiment will be described below. The contents common to the first embodiment are omitted.

図５，図６に示すように、圧力逃し手段４０は、弁箱８の下部に形成されて弁箱８の内外に連通する第１の逃し通路４１と、通路閉塞機構４２とを有している。通路閉塞機構４２は、弁箱８内の圧力が規定圧力未満では第１の逃し通路４１を閉じた状態を維持し、規定圧力以上では第１の逃し通路４１を開く機能を有している。 As shown in FIGS. 5 and 6, the pressure relief means 40 includes a first relief passage 41 formed in the lower portion of the valve box 8 and communicating with the inside and outside of the valve box 8, and a passage closing mechanism 42. Yes. The passage closing mechanism 42 has a function of maintaining the closed state of the first relief passage 41 when the pressure in the valve box 8 is less than the prescribed pressure, and opening the first relief passage 41 when the pressure is higher than the prescribed pressure.

第１の逃し通路４１は、弁箱８の内側に開口する大径部と、弁箱８の外側に開口する小径部と、大径部と小径部との境界に形成された段差部４１ａとを有している。
通路閉塞機構４２は、栓部材４３と、栓部材４３を閉方向Ｓに付勢するスプリング４４（弾性体の一例）とを有している。栓部材４３は、第１の逃し通路４１内に挿入された軸部４３ａと、軸部４３ａの一端に設けられ且つ弁箱８の外面に当接離間自在な円形の開閉板４３ｂと、軸部４３ａの他端に設けられ且つ逃し通路４１内に挿入された円形の受圧板４３ｃとを有している。 The first relief passage 41 includes a large diameter portion that opens to the inside of the valve box 8, a small diameter portion that opens to the outside of the valve box 8, and a stepped portion 41a formed at the boundary between the large diameter portion and the small diameter portion. have.
The passage closing mechanism 42 includes a plug member 43 and a spring 44 (an example of an elastic body) that urges the plug member 43 in the closing direction S. The plug member 43 includes a shaft portion 43a inserted into the first escape passage 41, a circular opening / closing plate 43b provided at one end of the shaft portion 43a and capable of coming into contact with and separating from the outer surface of the valve box 8, and a shaft portion A circular pressure receiving plate 43c provided at the other end of 43a and inserted into the escape passage 41.

受圧板４３ｃと軸部４３ａとには、一端が第１の逃し通路４１の大径部内に開口し、他端が軸部４３ａの外周面に開口する第２の逃し通路４５が形成されている。開閉板４３ｂには、開閉板４３ｂと弁箱８の外面との間をシールするＯリング４６（シール材の一例）が設けられている。また、スプリング４４は、第１の逃し通路４１内に挿入されており、受圧板４３ｃと第１の逃し通路４１内の段差部４１ａとの間に設けられている。 The pressure receiving plate 43c and the shaft portion 43a are formed with a second escape passage 45 having one end opened in the large diameter portion of the first escape passage 41 and the other end opened on the outer peripheral surface of the shaft portion 43a. . The opening / closing plate 43b is provided with an O-ring 46 (an example of a sealing material) that seals between the opening / closing plate 43b and the outer surface of the valve box 8. The spring 44 is inserted into the first escape passage 41 and is provided between the pressure receiving plate 43 c and the step portion 41 a in the first escape passage 41.

以下、上記構成における作用を説明する。
地震等が発生して非常に強い揺れに襲われ、水道管路１内の圧力が一時的に異常に上昇し、この異常な高圧が空気弁６の弁箱８内に伝播し、弁箱８内の圧力が規定圧力以上になると、受圧板４３ｃに作用する押圧力によって、図６（ｂ）に示すように、栓部材４３がスプリング４４の付勢力に抗して開方向Ｏへ移動し、開閉板４３ｂが弁箱８の外面から離間し、第２の逃し通路４５の他端開口部が第１の逃し通路４１の外部へ押し出される。これにより、弁箱８の内部と外部とが第１および第２の逃し通路４１，４５を介して連通するため、弁箱８内の圧力が第１および第２の逃し通路４１，４５を通って外部へ逃げ、弁箱８内の圧力が低下し、フロート９等の損傷を防止することができる。 Hereinafter, the operation of the above configuration will be described.
Due to an earthquake or the like, a very strong shake is attacked, and the pressure in the water pipe 1 temporarily rises abnormally. This abnormal high pressure propagates into the valve box 8 of the air valve 6, and the valve box 8 When the internal pressure becomes the specified pressure or more, the plug member 43 moves in the opening direction O against the urging force of the spring 44 by the pressing force acting on the pressure receiving plate 43c, as shown in FIG. The opening / closing plate 43 b is separated from the outer surface of the valve box 8, and the other end opening of the second escape passage 45 is pushed out of the first escape passage 41. As a result, the inside and the outside of the valve box 8 communicate with each other via the first and second relief passages 41 and 45, so that the pressure in the valve box 8 passes through the first and second relief passages 41 and 45. As a result, the pressure in the valve box 8 is reduced and the float 9 and the like can be prevented from being damaged.

また、弁箱８内の圧力が規定圧力未満に低下すると、図６（ａ）に示すように、栓部材４３がスプリング４４の付勢力によって閉方向Ｓへ移動し、開閉板４３ｂが弁箱８の外面に当接し、第２の逃し通路４５の他端開口部が第１の逃し通路４１の内部へ退入する。これにより、第１の逃し通路４１が栓部材４３で閉じられ、弁箱８の内部と外部とが栓部材４３を介して遮断される。この際、開閉板４３ｂと弁箱８の外面との間はＯリング４６によってシールされる。尚、通常は、このように第１の逃し通路４１を栓部材４３で閉じた状態に保たれている。 Further, when the pressure in the valve box 8 falls below the specified pressure, the plug member 43 moves in the closing direction S by the biasing force of the spring 44 as shown in FIG. The other end opening of the second escape passage 45 retreats into the first escape passage 41. As a result, the first escape passage 41 is closed by the plug member 43, and the inside and the outside of the valve box 8 are shut off via the plug member 43. At this time, the opening / closing plate 43 b and the outer surface of the valve box 8 are sealed by the O-ring 46. Normally, the first escape passage 41 is kept closed by the plug member 43 as described above.

（第３の実施の形態）
次に、第３の実施の形態を以下に説明する。尚、上記第１および第２の実施の形態と共通する内容については、省略する。 (Third embodiment)
Next, a third embodiment will be described below. The contents common to the first and second embodiments are omitted.

図７に示すように、補修弁７は、空気弁６の弁箱８の下部に連結された弁箱５１と、弁箱５１内に設けられた弁体５２と、弁体５２を開閉操作するための操作レバー５３とを有している。補修弁７の弁箱５１は下部フランジ５５と上部フランジ５６とを有している。補修弁７の下部フランジ５５は水道管路１のＴ字管２に接合され、補修弁７の上部フランジ５６は空気弁６の取付フランジ１５に接合されている。尚、上部フランジ５６には、上部フランジ５６と取付フランジ１５との間をシールするＯリング５７（シール部材の一例）が設けられている。 As shown in FIG. 7, the repair valve 7 opens and closes the valve box 51 connected to the lower part of the valve box 8 of the air valve 6, the valve body 52 provided in the valve box 51, and the valve body 52. And an operation lever 53. The valve box 51 of the repair valve 7 has a lower flange 55 and an upper flange 56. The lower flange 55 of the repair valve 7 is joined to the T-shaped pipe 2 of the water pipe 1, and the upper flange 56 of the repair valve 7 is joined to the mounting flange 15 of the air valve 6. The upper flange 56 is provided with an O-ring 57 (an example of a seal member) that seals between the upper flange 56 and the mounting flange 15.

弁箱５１内には、水道管路１のＴ字管２と空気弁６の連通孔１６とに通じる接続流路５４が形成されている。補修弁７の弁箱５１の上部には、上記第２の実施の形態における圧力逃し手段４０と同様の第１の逃し通路４１と通路閉塞機構４２とが設けられている。尚、この場合、圧力逃し手段４０は補修弁７の弁体５２と空気弁６の連通孔１６との間に位置している。 In the valve box 51, a connection channel 54 is formed that communicates with the T-shaped pipe 2 of the water pipe 1 and the communication hole 16 of the air valve 6. A first relief passage 41 and a passage closing mechanism 42 similar to the pressure relief means 40 in the second embodiment are provided on the upper portion of the valve box 51 of the repair valve 7. In this case, the pressure relief means 40 is located between the valve body 52 of the repair valve 7 and the communication hole 16 of the air valve 6.

これによると、上記第２の実施の形態と同様に、空気弁６の弁箱８内の圧力が規定圧力以上になると、栓部材４３が開方向へ移動して空気弁６の弁箱８内の圧力を逃すため、フロート９等の損傷を防止することができる。 According to this, similarly to the second embodiment, when the pressure in the valve box 8 of the air valve 6 becomes equal to or higher than the specified pressure, the plug member 43 moves in the opening direction and the inside of the valve box 8 of the air valve 6. Since the pressure is released, damage to the float 9 and the like can be prevented.

（第４の実施の形態）
次に、第４の実施の形態を以下に説明する。尚、先述した各々の実施の形態と共通する内容については、省略する。 (Fourth embodiment)
Next, a fourth embodiment will be described below. The contents common to the above-described embodiments are omitted.

図８，図９に示すように、空気弁６は、複数の連結部材５８を介して、補修弁７に昇降可能に連結されている。各連結部材５８はそれぞれ、ボルト５９とナット６０と座金６１とスプリング６２とを有しており、空気弁６の弁箱８内の圧力が規定圧力以上になると、図８の仮想線および図９（ｂ）で示すように、弁箱８を上昇させて弁箱８と補修弁７の弁箱５１との間を開く機能を有する圧力逃し手段の一例である。 As shown in FIGS. 8 and 9, the air valve 6 is connected to the repair valve 7 through a plurality of connecting members 58 so as to be movable up and down. Each connecting member 58 has a bolt 59, a nut 60, a washer 61, and a spring 62. When the pressure in the valve box 8 of the air valve 6 becomes equal to or higher than a specified pressure, the imaginary line in FIG. As shown in (b), this is an example of a pressure relief means having a function of raising the valve box 8 and opening between the valve box 8 and the valve box 51 of the repair valve 7.

ボルト５９はスプリング６２と空気弁６の取付フランジ１５のボルト孔６３と補修弁７の上部フランジ５６のボルト孔６４とに挿通され、ナット６０はボルト５９の下端部に螺合している。座金６１はボルト５９の頭部と取付フランジ１５との間およびナット６０と上部フランジ５６との間にそれぞれ設けられている。また、スプリング６２は、上部の座金６１と取付フランジ１５との間に設けられており、空気弁６の弁箱８に下向きの付勢力を付与している。 The bolt 59 is inserted into the spring 62, the bolt hole 63 of the mounting flange 15 of the air valve 6, and the bolt hole 64 of the upper flange 56 of the repair valve 7, and the nut 60 is screwed into the lower end portion of the bolt 59. The washer 61 is provided between the head of the bolt 59 and the mounting flange 15 and between the nut 60 and the upper flange 56. The spring 62 is provided between the upper washer 61 and the mounting flange 15 and applies a downward urging force to the valve box 8 of the air valve 6.

以下、上記構成における作用を説明する。
地震等の強い揺れによって弁箱８内の圧力が規定圧力以上になると、図８の仮想線および図９（ｂ）で示すように、空気弁６がスプリング６２の付勢力に抗して上昇し、取付フランジ１５が上部フランジ５６から上方へ離間して、空気弁６の弁箱８と補修弁７の弁箱５１との間が開き、両弁箱８，５１間に隙間６５が形成され、この隙間６５から空気弁６の弁箱８内の圧力が外部へ逃げる。これにより、弁箱８内の圧力が低下し、フロート９等の損傷を防止することができる。 Hereinafter, the operation of the above configuration will be described.
When the pressure in the valve box 8 exceeds a specified pressure due to strong shaking such as an earthquake, the air valve 6 rises against the urging force of the spring 62 as shown in the phantom line of FIG. 8 and FIG. 9B. The mounting flange 15 is spaced upward from the upper flange 56, the space between the valve box 8 of the air valve 6 and the valve box 51 of the repair valve 7 is opened, and a gap 65 is formed between both valve boxes 8 and 51. The pressure in the valve box 8 of the air valve 6 escapes from the gap 65 to the outside. Thereby, the pressure in the valve box 8 is lowered, and damage to the float 9 and the like can be prevented.

また、弁箱８内の圧力が規定圧力未満に低下すると、図８の実線および図９（ａ）で示すように、空気弁６がスプリング６２の付勢力によって下降し、取付フランジ１５が上部フランジ５６に当接して、空気弁６の弁箱８と補修弁７の弁箱５１との間が閉じ、隙間６５が無くなる。この際、取付フランジ１５と上部フランジ５６との間はＯリング５７によってシールされる。尚、通常は、このように空気弁６の弁箱８と補修弁７の弁箱５１との間が閉じた状態に保たれている。 When the pressure in the valve box 8 drops below the specified pressure, as shown by the solid line in FIG. 8 and FIG. 9A, the air valve 6 is lowered by the urging force of the spring 62, and the mounting flange 15 is moved to the upper flange. 56, the space between the valve box 8 of the air valve 6 and the valve box 51 of the repair valve 7 is closed, and the gap 65 is eliminated. At this time, the space between the mounting flange 15 and the upper flange 56 is sealed by the O-ring 57. Normally, the space between the valve box 8 of the air valve 6 and the valve box 51 of the repair valve 7 is kept closed as described above.

上記各実施の形態では、Ｏリング５７を、補修弁７の上部フランジ５６に設けたが、空気弁６の取付フランジ１５に設けてもよい。
（第５の実施の形態）
次に、第５の実施の形態を以下に説明する。尚、先述した各々の実施の形態と共通する内容については、省略する。 In each of the above embodiments, the O-ring 57 is provided on the upper flange 56 of the repair valve 7, but may be provided on the mounting flange 15 of the air valve 6.
(Fifth embodiment)
Next, a fifth embodiment will be described below. The contents common to the above-described embodiments are omitted.

図１０〜図１２に示すように、空気弁６の弁箱８の蓋部８ｂは昇降自在に胴部８ａに取付けられている。また、圧力逃し手段７０は、複数の第１のボルト１４と上下一対の座金７１，７２とスプリング７３（弾性体の一例）と調節用ナット７６とで構成されており、弁箱８内の圧力が規定圧力以上になると、図１１，図１２（ｂ）に示すように、蓋部８ｂを胴部８ａから上昇させて蓋部８ｂと胴部８ａとの間を開く機能を有している。 As shown in FIGS. 10-12, the cover part 8b of the valve box 8 of the air valve 6 is attached to the trunk | drum 8a so that raising / lowering is possible. The pressure relief means 70 includes a plurality of first bolts 14, a pair of upper and lower washers 71, 72, a spring 73 (an example of an elastic body), and an adjusting nut 76. When the pressure becomes equal to or higher than the specified pressure, as shown in FIGS. 11 and 12B, the lid 8b is lifted from the trunk 8a to open the gap between the lid 8b and the trunk 8a.

座金７１，７２は第１のボルト１４の頭部と蓋部８ｂとの間に設けられ、スプリング７３は上下両座金７１，７２間に設けられ、調節用ナット７６は上部の座金７１と第１のボルト１４の頭部との間に設けられている。第１のボルト１４は、座金７１，７２とスプリング７３と調節用ナット７６と蓋部８ｂの貫通孔２０とに挿通され、胴部８ａに螺合されている。尚、スプリング７３は蓋部８ｂに下向きの付勢力を付与するものであり、調節用ナット７６は第１のボルト１４に螺合してスプリング７３の圧縮量を調節するものである。 The washers 71 and 72 are provided between the head of the first bolt 14 and the lid portion 8b, the spring 73 is provided between the upper and lower washers 71 and 72, and the adjustment nut 76 is connected to the upper washer 71 and the first washer 71. Between the heads of the bolts 14. The first bolt 14 is inserted into the washers 71 and 72, the spring 73, the adjusting nut 76, and the through hole 20 of the lid portion 8b, and is screwed into the body portion 8a. The spring 73 applies a downward urging force to the lid portion 8b, and the adjustment nut 76 is screwed into the first bolt 14 to adjust the compression amount of the spring 73.

以下、上記構成における作用を説明する。
図１０に示すように、弁箱８内が満水になり、遊動弁体１０が閉位置まで上昇して大空気孔１７を閉じると共に、フロート９が小空気孔２１を閉じている際、遊動弁体１０の平坦部１０ｂが下方から蓋部８ｂの大空気孔用弁座１９に当接している。この状態で、地震等の強い揺れによって弁箱８内の圧力が規定圧力以上になると、この圧力によりフロート９と遊動弁体１０とが押し上げられ、図１１，図１２（ｂ）に示すように、蓋部８ｂがスプリング７３の付勢力に抗して上昇し、蓋部８ｂと胴部８ａとの間が開いて、蓋部８ｂと胴部８ａとの間に隙間７４が形成されると共に、案内枠体１１の鍔部２７と蓋部８ｂの大空気孔用弁座１９との間が開いて、隙間７４に連通する隙間７５が鍔部２７と大空気孔用弁座１９との間に形成される。 Hereinafter, the operation of the above configuration will be described.
As shown in FIG. 10, when the inside of the valve box 8 is full, the floating valve body 10 rises to the closed position, closes the large air hole 17, and the float 9 closes the small air hole 21. The flat portion 10b of the body 10 is in contact with the large air hole valve seat 19 of the lid portion 8b from below. In this state, when the pressure in the valve box 8 exceeds the specified pressure due to strong shaking such as an earthquake, the float 9 and the floating valve body 10 are pushed up by this pressure, as shown in FIGS. 11 and 12B. The lid portion 8b rises against the urging force of the spring 73, the gap between the lid portion 8b and the trunk portion 8a is opened, and a gap 74 is formed between the lid portion 8b and the trunk portion 8a. The gap 27 of the guide frame 11 and the large air hole valve seat 19 of the lid 8b are opened, and a gap 75 communicating with the gap 74 is formed between the flange 27 and the large air hole valve seat 19. It is formed.

空気弁６の弁箱８内の圧力は、遊動弁体１０の外周面と案内枠体１１の内周面との隙間から上記隙間７４，７５を経て外部へ逃げる。これにより、弁箱８内の圧力が低下し、フロート９等の損傷を防止することができる。 The pressure inside the valve box 8 of the air valve 6 escapes from the gap between the outer peripheral surface of the floating valve body 10 and the inner peripheral surface of the guide frame body 11 through the gaps 74 and 75 to the outside. Thereby, the pressure in the valve box 8 is lowered, and damage to the float 9 and the like can be prevented.

また、弁箱８内の圧力が規定圧力未満に低下すると、図１０，図１２（ａ）に示すように、蓋部８ｂがスプリング７３の付勢力により下降して胴部８ａの上端面に当接し、蓋部８ｂと胴部８ａとの間が閉じて隙間７４，７５が無くなる。この際、蓋部８ｂと鍔部２７との上下間は大空気孔用弁座１９によってシールされ、また、鍔部２７の下面が印籠部３２の底面に面接触することにより、鍔部２７と胴部８ａとの間がシールされる。尚、通常は、このように蓋部８ｂと胴部８ａとの間が閉じた状態に保たれている。 Further, when the pressure in the valve box 8 drops below the specified pressure, the lid portion 8b is lowered by the urging force of the spring 73 as shown in FIGS. 10 and 12 (a), and contacts the upper end surface of the body portion 8a. In contact with each other, the gap between the lid portion 8b and the body portion 8a is closed, and the gaps 74 and 75 are eliminated. At this time, the upper and lower portions of the lid portion 8b and the flange portion 27 are sealed by the large air hole valve seat 19, and the bottom surface of the flange portion 27 is in surface contact with the bottom surface of the stamped portion 32, thereby The space between the body portion 8a is sealed. Normally, the space between the lid portion 8b and the body portion 8a is kept closed as described above.

また、調節用ナット７６を回してスプリング７３の圧縮量を調節することにより、スプリング７３から蓋部８ｂに付与される下向きの付勢力の大きさを調整することができる。
（第６の実施の形態）
次に、第６の実施の形態を以下に説明する。尚、先述した各々の実施の形態と共通する内容については、省略する。 Further, the magnitude of the downward urging force applied from the spring 73 to the lid portion 8b can be adjusted by turning the adjusting nut 76 to adjust the compression amount of the spring 73.
(Sixth embodiment)
Next, a sixth embodiment will be described below. The contents common to the above-described embodiments are omitted.

図１３，図１４に示すように、圧力逃し手段８０は、遊動弁体１０に形成されて遊動弁体１０の内外に連通する逃し通路８１と、通路閉塞機構８２とを有している。通路閉塞機構８２は、図１４（ａ）に示すように弁箱８内の圧力が規定圧力未満では逃し通路８１を閉じた状態を維持し、図１４（ｂ）に示すように規定圧力以上では逃し通路８１を開くものであり、小空気孔用弁座２２とはめ輪２３と押えねじ２４とスプリング８３（弾性体の一例）と座金８４とを有している。 As shown in FIGS. 13 and 14, the pressure relief means 80 has a relief passage 81 formed in the floating valve body 10 and communicating with the inside and outside of the floating valve body 10, and a passage closing mechanism 82. The passage closing mechanism 82 maintains the state where the relief passage 81 is closed when the pressure in the valve box 8 is less than the specified pressure as shown in FIG. 14 (a), and is above the specified pressure as shown in FIG. 14 (b). The relief passage 81 is opened, and includes a small air hole valve seat 22, a snap ring 23, a presser screw 24, a spring 83 (an example of an elastic body), and a washer 84.

小空気孔用弁座２２とはめ輪２３とは逃し通路８１内の下部に昇降自在に嵌め込まれており、押えねじ２４は逃し通路８１内の上部にねじ込まれている。スプリング８３は、逃し通路８１内において押えねじ２４とはめ輪２３との間に設けられ、はめ輪２３を下方に付勢している。また、座金８４は、中央部に、小空気孔２１に連通する孔８４ａを有する円環状の部材であり、逃し通路８１内において押えねじ２４とスプリング８３との間に設けられている。 The small air hole valve seat 22 and the snap ring 23 are fitted in the lower part of the escape passage 81 so as to be movable up and down, and the presser screw 24 is screwed into the upper part of the escape passage 81. The spring 83 is provided between the presser screw 24 and the ferrule 23 in the escape passage 81 and urges the ferrule 23 downward. The washer 84 is an annular member having a hole 84 a communicating with the small air hole 21 at the center, and is provided between the presser screw 24 and the spring 83 in the escape passage 81.

小空気孔用弁座２２は、円筒部２２ａと、円筒部２２ａの上端部に形成され且つ径方向外向きに張り出した鍔部２２ｂとを有している。また、逃し通路８１は、小空気孔用弁座２２の円筒部２２ａが挿入される小径部８１ａと、鍔部２２ｂが挿入される大径部８１ｂとを有している。尚、小径部８１ａと大径部８１ｂとの境界には、小空気孔用弁座２２の鍔部２２ｂを下方から受ける受け面８１ｃが全周にわたり形成されている。 The small air hole valve seat 22 has a cylindrical portion 22a and a flange portion 22b formed at the upper end portion of the cylindrical portion 22a and projecting radially outward. The escape passage 81 has a small diameter portion 81a into which the cylindrical portion 22a of the small air hole valve seat 22 is inserted, and a large diameter portion 81b into which the flange portion 22b is inserted. A receiving surface 81c that receives the flange 22b of the small air hole valve seat 22 from below is formed at the boundary between the small diameter portion 81a and the large diameter portion 81b.

以下、上記構成における作用を説明する。
図１３に示すように、弁箱８内が満水になり、遊動弁体１０が閉位置まで上昇して大空気孔１７を閉じると共に、フロート９が下方から小空気孔用弁座２２の下端に当接して小空気孔２１を閉じている状態で、地震等の強い揺れによって弁箱８内の圧力が規定圧力以上になると、この圧力によりフロート９が押し上げられ、図１４（ｂ）に示すように、小空気孔用弁座２２とはめ輪２３とがスプリング８３の付勢力に抗して上昇し、小空気孔用弁座２２の鍔部２２ｂと逃し通路８１の受け面８１ｃとの間が開いて、鍔部２２ｂと受け面８１ｃとの間に隙間８４が形成され、これにより、逃し通路８１が開く。 Hereinafter, the operation of the above configuration will be described.
As shown in FIG. 13, the inside of the valve box 8 is full, the floating valve body 10 rises to the closed position, closes the large air hole 17, and the float 9 moves from below to the lower end of the small air hole valve seat 22. When the pressure in the valve box 8 exceeds a specified pressure due to strong shaking such as an earthquake while the small air hole 21 is closed, the float 9 is pushed up by this pressure, as shown in FIG. 14 (b). Furthermore, the small air hole valve seat 22 and the snap ring 23 rise against the urging force of the spring 83, and the gap between the flange 22 b of the small air hole valve seat 22 and the receiving surface 81 c of the escape passage 81 is As a result, a gap 84 is formed between the flange 22b and the receiving surface 81c, whereby the escape passage 81 is opened.

空気弁６の弁箱８内の圧力は、小空気孔用弁座２２の円筒部２２ａの外周面と逃し通路８１の小径部８１ａの内周面との間８５から隙間８４を経て、はめ輪２３の外周面と逃し通路８１の大径部８１ｂの内周面との間８６を抜け、座金８４の孔８４ａから押えねじ２４の小空気孔２１を経て外部へ逃げる。これにより、弁箱８内の圧力が低下し、フロート９等の損傷を防止することができる。 The pressure in the valve box 8 of the air valve 6 is passed through a gap 84 from the outer peripheral surface of the cylindrical portion 22 a of the valve seat 22 for the small air hole and the inner peripheral surface of the small diameter portion 81 a of the escape passage 81, and then the ferrule 23 passes through 86 between the outer peripheral surface of 23 and the inner peripheral surface of the large diameter portion 81 b of the escape passage 81, and escapes from the hole 84 a of the washer 84 to the outside through the small air hole 21 of the presser screw 24. Thereby, the pressure in the valve box 8 is lowered, and damage to the float 9 and the like can be prevented.

また、弁箱８内の圧力が規定圧力未満に低下すると、図１４（ａ）に示すように、小空気孔用弁座２２とはめ輪２３とがスプリング８３の付勢力により下降して、小空気孔用弁座２２の鍔部２２ｂが逃し通路８１の受け面８１ｃに当接し、鍔部２２ｂと受け面８１ｃとの間が閉じて隙間８４が無くなり、これにより、逃し通路８１が閉じる。尚、通常は、このように鍔部２２ｂと受け面８１ｃとの間が閉じた状態に保たれている。 When the pressure in the valve box 8 drops below the specified pressure, the small air hole valve seat 22 and the snap ring 23 are lowered by the urging force of the spring 83 as shown in FIG. The flange 22b of the air hole valve seat 22 comes into contact with the receiving surface 81c of the escape passage 81, the gap between the flange 22b and the receiving surface 81c is closed, and the gap 84 is eliminated, whereby the escape passage 81 is closed. Normally, the space between the flange portion 22b and the receiving surface 81c is kept closed as described above.

上記各実施の形態では、図１に示すように、空気弁６と補修弁７とを有する空気弁装置５を挙げたが、補修弁７を備えていないものであってもよい。また、接続部材の一例として補修弁７を示したが、補修弁７に限定されるものではなく、例えば、補修弁７の代りに、上下両端にフランジを有する短管部材等であってもよい。 In each of the above embodiments, as shown in FIG. 1, the air valve device 5 having the air valve 6 and the repair valve 7 is described, but the repair valve 7 may not be provided. Moreover, although the repair valve 7 was shown as an example of a connection member, it is not limited to the repair valve 7, For example, instead of the repair valve 7, the short pipe member etc. which have a flange on both upper and lower ends may be sufficient. .

上記各実施の形態では、図１に示すように、空気弁装置５を水道管路１に取付けているが、水道管路１以外の別の管路に取付けてもよい。 In each of the above embodiments, as shown in FIG. 1, the air valve device 5 is attached to the water pipe 1, but may be attached to another pipe other than the water pipe 1.

１水道管路（管路）
５空気弁装置
７補修弁（接続部材）
８弁箱
８ａ胴部
８ｂ蓋部
９フロート
１０遊動弁体
１６連通孔
１７大空気孔（空気孔）
１８弁箱内流路
２１小空気孔
３０圧力逃し弁（圧力逃し手段）
４０，７０，８０圧力逃し手段
４１，４５第１および第２の逃し通路
４２通路閉塞機構
５４接続流路
５８連結部材（圧力逃し手段）
８１逃し通路
８２通路閉塞機構 1 water pipe (pipe)
5 Air valve device 7 Repair valve (connecting member)
8 Valve box 8a Body 8b Lid 9 Float 10 Floating valve body 16 Communication hole 17 Large air hole (air hole)
18 Valve box flow path 21 Small air hole 30 Pressure relief valve (pressure relief means)
40, 70, 80 Pressure relief means 41, 45 First and second relief passages 42, passage closing mechanism 54, connection passage 58, connecting member (pressure relief means)
81 Escape passage 82 Passage closing mechanism

Claims

An openable air hole is formed in the upper part of the valve box,
A communication hole communicating with the pipe line is formed at the bottom of the valve box,
In the valve box, a flow path in the valve box that leads to the air hole and the communication hole, and a float that can be raised and lowered are provided,
An air valve device in which an air hole is closed by raising a float,
An air valve device comprising pressure relief means for releasing the pressure in the valve box to the outside when the pressure in the valve box becomes equal to or higher than a specified pressure.

The pressure relief means has a relief passage formed in the valve box and communicating with the inside and outside of the valve box, and a passage closing mechanism,
2. The air valve device according to claim 1, wherein the passage closing mechanism maintains a state in which the relief passage is closed when the pressure in the valve box is less than a prescribed pressure, and opens the relief passage when the pressure is higher than the prescribed pressure.

A connecting member is connected to the lower part of the valve box,
In the connection member, a connection flow path leading to the inside of the pipe line and the communication hole is provided,
The pressure relief means includes a relief passage formed in the connection member and communicating with the inside and outside of the connection member, and a passage closing mechanism.
2. The air valve device according to claim 1, wherein the passage closing mechanism maintains a state in which the relief passage is closed when the pressure in the connection flow path is less than a prescribed pressure, and opens the relief passage when the pressure is higher than the prescribed pressure.

A connecting member is connected to the lower part of the valve box,
In the connection member, a connection flow path leading to the inside of the pipe line and the communication hole is provided,
The valve box is connected to the connecting member so as to be movable up and down,
2. The air valve device according to claim 1, wherein the pressure relief means has a function of raising the valve box and opening the valve box and the connecting member when the pressure in the valve box becomes equal to or higher than a specified pressure.

In the valve box, a floating valve body that is raised and lowered by a float to open and close the air hole is provided,
The valve box has a cylindrical barrel and a lid that can be raised and lowered provided on the upper portion of the barrel,
Air holes are formed in the lid,
The pressure relief means has a function of raising a lid portion of the valve box from the trunk portion and opening the lid portion and the trunk portion when the pressure in the valve box becomes equal to or higher than a specified pressure. The pneumatic valve device as described.

In the valve box, a floating valve body that is raised and lowered by a float to open and close the air hole is provided,
A small air hole that is opened and closed by raising and lowering the float is formed in the floating valve body,
The pressure relief means has a relief passage formed in the idle valve body and communicating with the inside and outside of the idle valve body, and a passage closing mechanism,
2. The air valve device according to claim 1, wherein the passage closing mechanism maintains a state in which the relief passage is closed when the pressure in the valve box is less than a prescribed pressure, and opens the relief passage when the pressure is higher than the prescribed pressure.