JP6752411B2

JP6752411B2 - Piping structure

Info

Publication number: JP6752411B2
Application number: JP2015106694A
Authority: JP
Inventors: 久保内　秀樹; 秀樹久保内
Original assignee: 丸一株式会社
Priority date: 2015-05-26
Filing date: 2015-05-26
Publication date: 2020-09-09
Anticipated expiration: 2035-05-26
Also published as: JP2016217096A

Description

本願発明は、逆流防止弁を備えた配管構造に関し、更に詳しくは、逆流防止弁を備えた配管構造に関するものである。 The present invention relates to a piping structure provided with a check valve, and more particularly to a piping structure provided with a check valve.

従来より、流体が内部を通過する配管部材を利用した配管構造において、配管構造内部を通過する流体が、下流側から上流側に逆流することを防止するために、配管構造の内部に逆流防止弁を採用した配管構造が知られている。その一例として、特許文献１に記載の逆流防止弁を備えた配管構造について説明する。
配管構造の内部を流れる流体としては、気体、液体等様々な流体が考えられるが、この特許文献１に記載された、従来の逆流防止弁を備えた配管構造は、液体の特に浴槽・浴室・洗面台・流し台等使用により排水を生じる機器（以下「排水機器」）からの排水を処理する配管構造（排水配管）である。 Conventionally, in a piping structure using a piping member through which a fluid passes, a check valve is provided inside the piping structure in order to prevent the fluid passing through the inside of the piping structure from flowing back from the downstream side to the upstream side. The piping structure that adopts is known. As an example thereof, a piping structure provided with a check valve described in Patent Document 1 will be described.
Various fluids such as gas and liquid can be considered as the fluid flowing inside the piping structure, but the conventional piping structure provided with the check valve described in Patent Document 1 is a liquid, especially a bathtub / bathroom. It is a piping structure (drainage piping) that treats wastewater from equipment that produces wastewater by using a washbasin, sink, etc. (hereinafter referred to as "drainage equipment").

従来の逆流防止弁を備えた配管構造は、浴槽・浴室等の排水機器の排水を処理する配管構造であって、以下に記載する、浴槽と、洗い場パンと、配管部材と、逆流防止弁と、から構成される。
浴槽は、上方が開口した槽体であって、底面に、内部に溜めた浴湯を排出するための浴槽排水口を備えてなる。
洗い場パンは、浴室の使用者が身体を洗う等する、浴槽に隣接して備えられた防水パンであって、底面に洗い場パン上の排水を排出するための洗い場パン排水口を備えてなる。
配管部材は、以下に記載する管体、逆流防止弁等より構成される。
管体は、浴槽や洗い場パンより生じた排水を、下水側の配管に接続するための円筒状の部材であって、直線状の直管や、角度を持って屈曲したエルボ管、Ｔ字形状に分岐したＴ字管等の種類がある。これらは硬質樹脂、または金属材等から構成され、ナット部材や、接着剤等を利用して接続される。
逆流防止弁は、配管構造の内部に配置固定される、シリコンゴム等弾性を有する素材から構成される部材であって、略筒形状とした本体部と、本体部の上流側の端部に備えた開口部と、本体部の下流側の端部に備えた、対向する面同士が漸次近接するように設けた傾斜部と、該両傾斜部の先端に設けた薄膜部分からなる当接面と、両当接面同士を互いに当接させることで排水流路を閉塞する閉塞部と、を備えてなる。
この逆流防止弁は、上記のように構成したことで、上流側の端部である開口部から排水が流入すると、その重量／水圧により、下流側の閉塞部が弾性変形し、開口して内部の排水を排出する。排水の排出が完了し、内部の排水の量が減少すると、開口した閉塞部が弾性により元の閉塞状態に変形し、閉塞部が閉塞する。
下流側から屋内側に臭気や排水、害虫類等が逆流しようとした場合、配管の途中に配置されたこの逆流防止弁の閉塞部が閉塞していることにより、通過することができないため、この逆流防止弁よりも上流側に逆流することができない。また通気や排水の逆流が生じた場合でも、外周方向から圧力が加えられた場合では、閉塞部の対向する面同士がより強く当接するため、閉塞を維持し、下流側から上流側への通過、即ち逆流を防止する。 The conventional piping structure provided with a check valve is a piping structure for treating drainage from drainage equipment such as a bathtub / bathroom, and includes a bathtub, a washing place pan, a piping member, and a check valve, which are described below. , Consists of.
The bathtub is a bathtub body with an opening at the top, and has a bathtub drainage port on the bottom surface for draining the bathtub stored inside.
The washing place pan is a waterproof pan provided adjacent to the bathtub for the bathroom user to wash his / her body, and has a washing place pan drain port on the bottom surface for draining the drainage on the washing place pan.
The piping member is composed of the pipe body, the check valve, etc. described below.
The pipe body is a cylindrical member for connecting the drainage generated from the bathtub or the washing place pan to the pipe on the sewage side, and is a straight straight pipe, an elbow pipe bent at an angle, or a T-shape. There are types such as T-shaped pipes that are branched into. These are composed of a hard resin, a metal material, or the like, and are connected by using a nut member, an adhesive, or the like.
The backflow prevention valve is a member made of an elastic material such as silicon rubber, which is arranged and fixed inside the piping structure, and is provided at a main body portion having a substantially tubular shape and an upstream end portion of the main body portion. An opening, an inclined portion provided at the downstream end of the main body portion so that the facing surfaces gradually approach each other, and a contact surface composed of a thin film portion provided at the tip of both inclined portions. A closed portion that closes the drainage flow path by bringing both contact surfaces into contact with each other is provided.
This check valve is configured as described above, and when drainage flows in from the opening that is the end on the upstream side, the closed part on the downstream side is elastically deformed due to its weight / water pressure and opens to the inside. Drain the drainage. When the drainage of the drainage is completed and the amount of drainage inside is reduced, the opened closed portion is elastically deformed to the original closed state, and the closed portion is closed.
When odors, drainage, pests, etc. try to flow back from the downstream side to the indoor side, it cannot pass because the closed part of this backflow prevention valve located in the middle of the pipe is blocked. It cannot flow back to the upstream side of the check valve. Even when ventilation or drainage backflow occurs, when pressure is applied from the outer peripheral direction, the facing surfaces of the closed portion come into contact with each other more strongly, so that the closed portion is maintained and the passage from the downstream side to the upstream side is maintained. That is, it prevents backflow.

上記の各部材から構成される浴槽・浴室の逆流防止弁を備えた配管構造は、以下のようにして施工され、排水を下水側に排出する。
浴槽、浴室の各排水口から、下水側の配管迄を、管体によって配管接続する。この管体の配管接続においては、浴槽と浴室の各排水口からの配管を、途中部分でＴ字管を用いて合流させ、それより下流側の配管を、下水側の配管に接続させる。この時は排水が下流側（下水側）に流れるよう、若干の角度勾配を配管に備えて配管する。
更に浴槽又は洗い場パンの各排水口からＴ字管までの間に、逆流防止弁をそれぞれ配置して、浴槽・浴室の配管構造の施工が完了する。
上記のように構成した浴槽・浴室の排水配管において、浴槽又は洗い場パンの排水口から排水が排出されると、排水は、排水口から管体と、その内部に配置された逆流防止弁を通過し、Ｔ字管体を通過して、下水側に排出される。
また、下水側から臭気や害虫類が逆流してきた場合でも、それぞれの排水口に至る管体上に備えられた逆流防止弁によって、それらが逆流防止弁よりも上流側に逆流することはない。また、浴槽排水口または洗い場排水口の一方の排水口に、Ｔ字管を介して他方の排水口からの排水が逆流してきた場合、または下水側から両方の排水口に排水が逆流してきた場合でも、逆流防止弁によって、逆流防止弁よりも上流側に排水が逆流することを防止することができる。 The piping structure provided with the check valve for the bathtub / bathroom composed of the above members is constructed as follows, and the drainage is discharged to the sewage side.
Pipes are connected from the drains of the bathtub and bathroom to the pipes on the sewage side by means of pipes. In the pipe connection of this pipe body, the pipes from the drains of the bathtub and the bathroom are joined by using a T-shaped pipe in the middle portion, and the pipe on the downstream side is connected to the pipe on the sewage side. At this time, the pipe should be provided with a slight angular gradient so that the drainage flows to the downstream side (sewage side).
Further, a check valve is arranged between each drain port of the bathtub or the washing place pan and the T-shaped pipe, and the construction of the piping structure of the bathtub / bathroom is completed.
In the drainage pipe of the bathtub / bathroom configured as described above, when drainage is discharged from the drainage port of the bathtub or washing place pan, the drainage passes through the pipe body and the check valve arranged inside the drainage port. Then, it passes through the T-shaped pipe and is discharged to the sewage side.
Further, even if odors and pests flow back from the sewage side, they will not flow back to the upstream side of the check valve by the check valve provided on the pipe body leading to each drain port. In addition, when the drainage from the other drainage port flows back to one of the tub drainage port or the washing place drainage port through the T-shaped pipe, or when the drainage flows back to both drainage ports from the sewage side. However, the check valve can prevent the drainage from flowing back to the upstream side of the check valve.

特開２００８−１６９５７５号公報Japanese Unexamined Patent Publication No. 2008-169575

特許文献１に記載のような、逆流防止弁に対して応力が加わっていない状態において閉塞部が閉塞している逆流防止弁を備えた配管構造の場合、以下に記載するような問題点があった。
図１３に示す配管構造には、逆流防止弁の上流側に排水トラップが配置されており、当該排水トラップの下流側に逆流防止弁が配置されている。
排水トラップは、管体を略Ｓ字形状に屈曲させ、横転させた形状を成す部材であって、使用時にその内部を通過する排水がＳ字の屈曲部分に貯留される。これにより、排水トラップ内部の排水流路の一部が常に満水状態となって、この満水部分により下流側の臭気や害虫の逆流を防止することができる。尚、この屈曲部分に貯留された、流路を満水状態にする排水を封水と呼び、図中では斜線を引いて示している。当該封水は最大で図１３にて記載した水面にて示す高さ、即ち排水トラップ内の排水流路の上昇部分の頂点である溢れ面Ｏまで排水を貯留することができる。
ここで、上記配管構造に対し設備機器より大量の排水が排出された際、排水流路が満水状態となることによって、自己サイホン現象と呼ばれる引き込み現象が生じる。当該自己サイホン現象が生じた際、排水流路の下流側に大きな負圧が発生し、排水流路中の排水は勢いよく下流側へと排出される。そして、排水が終了した際、排水流路内が負圧となったまま逆流防止弁が閉塞してしまうことにより、排水トラップと逆流防止弁の間の排水流路、即ち排水トラップの封水より下流側且つ逆流防止弁よりも上流側の空間Ｒが負圧の状態となる。
逆流防止弁は下流側が負圧となった場合には排水流路の閉塞を解除し、気体や液体等の流体を通過させるが、上記の場合においては、逆流防止弁の上流側が負圧となるため、閉塞部は排水流路の閉塞状態を維持し、空間Ｒの負圧は解消されない。従って、本来の空間Ｒが負圧でない状態であれば、図１３のように、封水の上流側の水位は溢れ面Ｏと同じ高さまで上昇するが、図１４に示すように、空間Ｒが負圧の状態の時には、封水の上流側と下流側との圧力差に伴い、封水の上流側と下流側で水位差が生じてしまう。この時、排水トラップに対して更に排水が流入しても、上記空間Ｒの負圧に伴う水位差は解消されず、図１４の状態を維持してしまう。従って、図１３に示す、空間Ｒが負圧でない状態に比べ、排水トラップ内に貯留可能な封水の総量が少なくなってしまう。
尚、上記問題点は自己サイホン現象が生じた場合だけでなく、配管構造の下流側の配管に大量の排水が流れることによって生じる、誘導サイホン現象と呼ばれる引き込み現象が生じた際等の場合にも発生する。 In the case of a piping structure provided with a check valve in which the closed portion is closed when no stress is applied to the check valve as described in Patent Document 1, there are problems as described below. It was.
In the piping structure shown in FIG. 13, a drain trap is arranged on the upstream side of the check valve, and a check valve is arranged on the downstream side of the drain trap.
The drain trap is a member in which the pipe body is bent into a substantially S-shape and rolled over, and the drainage that passes through the inside of the drain trap is stored in the S-shaped bent portion during use. As a result, a part of the drainage channel inside the drain trap is always filled with water, and the filled part can prevent the backflow of odors and pests on the downstream side. The drainage that fills the flow path and is stored in this bent portion is called water sealing, and is shaded in the figure. The sealed water can store drainage up to the height indicated by the water surface shown in FIG. 13, that is, the overflow surface O which is the apex of the rising portion of the drainage flow path in the drain trap.
Here, when a large amount of drainage is discharged from the equipment to the above piping structure, the drainage channel becomes full, so that a pull-in phenomenon called a self-siphon phenomenon occurs. When the self-siphon phenomenon occurs, a large negative pressure is generated on the downstream side of the drainage channel, and the drainage in the drainage channel is vigorously discharged to the downstream side. Then, when the drainage is completed, the check valve is blocked while the pressure inside the drainage channel remains negative, so that the drainage channel between the drain trap and the check valve, that is, the water sealing of the drain trap The space R on the downstream side and on the upstream side of the check valve is in a negative pressure state.
The check valve releases the blockage of the drainage flow path when the downstream side becomes negative pressure and allows fluids such as gas and liquid to pass through, but in the above case, the upstream side of the backflow prevention valve becomes negative pressure. Therefore, the closed portion maintains the closed state of the drainage flow path, and the negative pressure in the space R is not eliminated. Therefore, if the original space R is not in a negative pressure state, the water level on the upstream side of the sealed water rises to the same height as the overflow surface O as shown in FIG. 13, but as shown in FIG. 14, the space R rises. In a negative pressure state, a water level difference occurs between the upstream side and the downstream side of the sealed water due to the pressure difference between the upstream side and the downstream side of the sealed water. At this time, even if more drainage flows into the drain trap, the water level difference due to the negative pressure of the space R is not eliminated, and the state of FIG. 14 is maintained. Therefore, the total amount of sealed water that can be stored in the drain trap is smaller than that in the state where the space R is not negative pressure as shown in FIG.
The above problem is not only when the self-siphon phenomenon occurs, but also when a pull-in phenomenon called an inductive siphon phenomenon occurs, which is caused by a large amount of drainage flowing through the piping on the downstream side of the piping structure. appear.

又、下流側に負圧が生じた際には逆流防止弁内部を気体が通過するが、当該気体の通過に合わせて、閉塞部は極めて短い間隔で連続して開閉を繰り返し、結果、笛の音の様な不快な騒音（以下、「笛様音」）を発生させることがある。 In addition, when a negative pressure is generated on the downstream side, gas passes through the inside of the check valve, but the closed part repeatedly opens and closes continuously at extremely short intervals according to the passage of the gas, and as a result, the whistle It may generate unpleasant noise such as sound (hereinafter referred to as "whistle-like sound").

本発明は上記問題点に鑑み発明されたものであって、排水トラップの下流側に逆流防止弁を備えた配管構造において、排水流路内に生じる負圧に基づく封水の減少を防止するとともに、不快な笛様音の発生を抑制する配管構造の提供を課題とする。 The present invention has been invented in view of the above problems, and in a piping structure provided with a check valve on the downstream side of the drain trap, it is possible to prevent a decrease in sealing water due to negative pressure generated in the drain flow path. The subject is to provide a piping structure that suppresses the generation of unpleasant whistle-like sounds.

請求項１に記載の本発明は、
内部に排水を貯留し、封水を形成する排水トラップと、
下流側からの排水や臭気の逆流を防止する逆流防止弁と、
配管外の大気を排水流路内へ流入させる吸気部からなり、
上記逆流防止弁は、排水トラップの下流側の排水流路内に配置され、排水トラップの封水より下流側且つ逆流防止弁よりも上流側の排水流路内の空間が負圧の際において排水流路の閉塞を維持する構造であって、
上記排水トラップは、管体を略Ｓ字形状に屈曲させた部材であって、第一屈曲部及び第二屈曲部を有し、
上記吸気部は第二屈曲部上面に設けた突出部分の上方に配置され、排水トラップ側に負圧が発生した場合は、排水トラップ側に外気を供給し、それ以外の状態では配管の内外の連通を防止し、配管内部の排水や臭気等の流体が配管外に漏れることを防ぐ弁部材と吸気口を備えてなるとともに、前記逆流防止弁の下流側に配管外の大気を配管内に吸気する吸気部を備えたことを特徴とする配管構造である。
The present invention according to claim 1.
A drain trap that stores drainage inside and forms a seal,
A check valve that prevents drainage from the downstream side and backflow of odors,
It consists of an intake part that allows the air outside the pipe to flow into the drainage channel.
The check valve is arranged in the drain flow path on the downstream side of the drain trap, and drains when the space in the drain flow path on the downstream side of the sealing water of the drain trap and on the upstream side of the backflow prevention valve is negative pressure. A structure that maintains the blockage of the flow path
The drain trap is a member in which a pipe body is bent into a substantially S shape, and has a first bent portion and a second bent portion.
The intake portion is arranged above the protruding portion provided on the upper surface of the second bent portion, and when a negative pressure is generated on the drain trap side, outside air is supplied to the drain trap side, and in other states, inside and outside the pipe. It is equipped with a valve member and an intake port to prevent communication and prevent fluids such as drainage and odors inside the pipe from leaking to the outside of the pipe, and to take in the air outside the pipe into the pipe on the downstream side of the check valve. It is a piping structure characterized by having an intake unit .

請求項２に記載の本発明は、前記逆流防止弁は、逆流防止弁に応力が作用していない状態において排水流路の閉塞を維持する構造であることを特徴とする請求項１に記載の配管構造である。 The present invention according to claim 1, wherein the check valve has a structure that maintains the blockage of the drainage flow path in a state where stress is not applied to the check valve. It is a piping structure.

請求項３に記載の本発明は、前記逆流防止弁は略筒体状にして弾性を有する素材からなり、
下流側に進むにつれて、対向する面に対して漸次近接するよう傾斜を設けた傾斜面と、逆流防止弁に応力が作用していない状態において、前記傾斜面が対向する面と当接面によって当接することで形成される閉塞部を備えることを特徴とする請求項１乃至請求項２のいずれか一つに記載の配管構造である。
According to the third aspect of the present invention, the check valve is made of a material having a substantially tubular shape and elasticity.
As the vehicle advances to the downstream side, the inclined surface is inclined so as to gradually approach the opposing surface, and the inclined surface is in contact with the facing surface in a state where no stress is applied to the check valve. The piping structure according to any one of claims 1 to 2 , wherein a closed portion formed by contacting the pipe is provided.

請求項１及び請求項２に記載の本発明では、排水トラップ内、若しくは排水トラップと逆流防止弁との間に吸気部が備えられている。従って、排水トラップの封水より下流側且つ逆流防止弁よりも上流側の排水流路内の空間に負圧が生じた際、吸気部の吸気によって当該負圧を解消し、封水の総量が少なくなることを防ぐことができる。
請求項１に記載の本発明では、逆流防止弁の下流側に吸気部を設けることにより、逆流防止弁内部を気体が通過した際に生じる笛様音の発生を防止することができる。
請求項３に記載の本発明では、逆流防止弁の構造を明確する事ができる。 According to the first and second aspects of the present invention, an intake portion is provided in the drain trap or between the drain trap and the check valve. Therefore, when a negative pressure is generated in the space in the drainage flow path on the downstream side of the water trap and on the upstream side of the check valve, the negative pressure is eliminated by the intake air of the intake unit, and the total amount of the water seal is reduced. It can be prevented from decreasing.
According to the first aspect of the present invention, by providing the intake portion on the downstream side of the check valve, it is possible to prevent the generation of wheezing sound generated when the gas passes through the inside of the check valve.
In the present invention according to claim 3 , the structure of the check valve can be clarified.

第一実施例を示す断面図である。It is sectional drawing which shows the 1st Example. 第一実施例の施工状態を示す側面図である。It is a side view which shows the construction state of 1st Example. 図２のＡ−Ａ断面図である。FIG. 2 is a sectional view taken along the line AA of FIG. 図３の構成より逆流防止弁ユニットを取り出した状態を示す参考図である。It is a reference figure which shows the state which took out the check flow prevention valve unit from the structure of FIG. 逆流防止弁の閉塞部が閉口した状態を示す底面図である。It is a bottom view which shows the state which the closed part of a check valve is closed. 図５のＢ−Ｂ断面図である。FIG. 5 is a cross-sectional view taken along the line BB of FIG. 図５のＣ−Ｃ断面図である。FIG. 5 is a sectional view taken along the line CC of FIG. 逆流防止弁の、図５の状態における下方からの斜視図である。It is a perspective view from the lower side of the check valve in the state of FIG. 逆流防止弁の閉塞部が開口した状態を示す底面図である。It is a bottom view which shows the state which the closed part of the check valve is open. 逆流防止弁の、図９の状態における下方からの斜視図である。It is a perspective view from the lower side of the check valve in the state of FIG. 吸気弁の閉口状態を示す断面図である。It is sectional drawing which shows the closed state of the intake valve. 吸気弁の開口状態を示す断面図である。It is sectional drawing which shows the opening state of an intake valve. 従来例を示す断面図である。It is sectional drawing which shows the conventional example. 図１３より、封水より下流側且つ逆流防止弁よりも上流側の空間が負圧となった状態を示す断面図である。FIG. 13 is a cross-sectional view showing a state in which the space on the downstream side of the sealing water and on the upstream side of the check valve has a negative pressure.

以下に、本発明の第一実施例を、図面を参照しつつ説明する。尚、以下に記載する説明は実施形態の理解を容易にするためのものであり、これによって発明が制限して理解されるものではない。 The first embodiment of the present invention will be described below with reference to the drawings. It should be noted that the description described below is for facilitating the understanding of the embodiment, and the invention is not limited and understood by this.

図１乃至図１２に示した、本発明の第一実施例の配管構造は、洗面台や流し台等の図示しない排水機器のキャビネット内に配管され、排水機器の使用によって生じる排水を下水側に排出処理する排水配管、即ち排水処理を行う為の配管構造であって、以下に記載する、配管部材、逆流防止弁ユニット７、吸気部としての吸気弁３、より構成されてなる。 The piping structure of the first embodiment of the present invention shown in FIGS. 1 to 12 is piped in a cabinet of a drainage device (not shown) such as a washbasin or a sink, and drainage generated by the use of the drainage device is discharged to the sewage side. It is a drainage pipe to be treated, that is, a pipe structure for performing wastewater treatment, and is composed of a piping member, a check valve unit 7, and an intake valve 3 as an intake unit, which are described below.

配管部材は、設備機器内に生じた排水を、下水側の配管に接続するための部材であって、以下に記載する、封水式排水トラップ８、直線状管体Ｓ、逆流防止弁継手５、吸気弁３、より構成されてなる。 The piping member is a member for connecting the drainage generated in the equipment to the piping on the sewage side, and is described below in the water-sealing type drain trap 8, the linear pipe body S, and the check valve joint 5. , Intake valve 3, and so on.

封水式排水トラップ８は、管体を略Ｓ字形状に屈曲させ、横転させた形状を成す部材であって、使用時にその内部を通過する排水が内部の封水貯留部８ｆに貯留され、これによって流路の一部が常に満水状態となって、この満水部分により下流側からの臭気や害虫類の逆流を防止することができる。このように、下流側からの臭気や害虫類の逆流を防ぐ機構を備えた排水装置を排水トラップと呼び、また、封水貯留部８ｆに溜まった、流路を満水状態にする排水を封水と呼ぶ。尚、図１では貯留された封水に斜線を引いて示している。
本実施例の封水式排水トラップ８は第一下り部８ａ、第一屈曲部８ｂ、上り部８ｃ、第二屈曲部８ｄ、吸気弁３、第二下り部８ｅより構成されている。
第一下り部８ａは封水式排水トラップ８の最も上流側の排水流路であって、下流側へ進むにつれて管体が下方に向けて延設されることによって構成された排水流路であり、図示しない設備機器からの排水流路と連結している。又、第一下り部８ａはその下端より屈曲し、第一屈曲部８ｂと連続している。
第一屈曲部８ｂは管体を約１８０°、略Ｕ字状に屈曲して形成され、前記第一下り部８ａと上り部８ｃとを繋ぐとともに、底部に清掃口を有している。
上り部８ｃは封水式排水トラップ８の下流側に進むにつれて、管体が上方に向けて延設されることによって形成された排水流路であって、第一屈曲部８ｂ下流側より立ち上げられ、第二屈曲部８ｄと連続している。尚、上り部８ｃは前記第一屈曲部８ｂからの立ち上がり部分（上昇に転じる部分）において縮径し、当該縮径により上り部８ｃの管径が前記第一下り部８ａの２／３から３／４程度となっている。そして、以降の排水流路においては当該縮径後の径を維持している。
第二屈曲部８ｄは管体を約１８０°、略Ｕ字状に屈曲されて形成され、上り部８ｃと後述する第二下り部８ｅとを繋ぐとともに、上面において設けられた開口に吸気弁３が取り付けられている。尚、上記開口は流路側端部の側面が突出して流路を狭めている。
第二下り部８ｅは前記第二屈曲部８ｄの端部より連続し、下流側へ進むにつれて管体が下方に向けて延設されることによって構成された排水流路である。 The water-sealed drain trap 8 is a member in which the pipe body is bent into a substantially S shape and rolled over, and the drainage that passes through the inside of the trap 8 is stored in the internal water-sealed storage portion 8f during use. As a result, a part of the flow path is always filled with water, and this filled part can prevent odors and backflow of pests from the downstream side. In this way, the drainage device equipped with a mechanism to prevent the backflow of odors and pests from the downstream side is called a drain trap, and the drainage collected in the sealed water storage section 8f that fills the flow path is sealed. Called. In FIG. 1, the stored water seal is shaded.
The water-sealed drain trap 8 of this embodiment is composed of a first descending portion 8a, a first bending portion 8b, an ascending portion 8c, a second bending portion 8d, an intake valve 3, and a second descending portion 8e.
The first downhill portion 8a is the drainage flow path on the most upstream side of the water-sealed drainage trap 8, and is a drainage flow path formed by extending the pipe body downward as it goes to the downstream side. , Connected to a drainage channel from equipment not shown. Further, the first descending portion 8a is bent from the lower end thereof and is continuous with the first bent portion 8b.
The first bent portion 8b is formed by bending the pipe body in a substantially U shape at about 180 °, connecting the first descending portion 8a and the ascending portion 8c, and having a cleaning port at the bottom.
The ascending portion 8c is a drainage flow path formed by extending the pipe body upward as it advances to the downstream side of the water-sealed drain trap 8, and is raised from the downstream side of the first bent portion 8b. It is continuous with the second bent portion 8d. The diameter of the ascending portion 8c is reduced at the rising portion (the portion that turns to ascending) from the first bent portion 8b, and the pipe diameter of the ascending portion 8c is reduced from 2/3 to 3 of the first descending portion 8a due to the reduced diameter. It is about / 4. Then, in the subsequent drainage flow path, the diameter after the diameter reduction is maintained.
The second bent portion 8d is formed by bending the pipe body in a substantially U shape at about 180 °, connecting the ascending portion 8c and the second descending portion 8e described later, and the intake valve 3 is provided in the opening provided on the upper surface. Is installed. The side surface of the flow path side end of the opening protrudes to narrow the flow path.
The second descending portion 8e is a drainage flow path that is continuous from the end portion of the second bent portion 8d and is formed by extending the pipe body downward as it goes downstream.

ここで、上記封水式排水トラップ８は、内部に排水が流入した際、第一下り部８ａ、第一屈曲部８ｂ、上り部８ｃによって封水貯留部８ｆを形成し、内部に排水を貯留し、封水を形成する。又、本実施例の封水貯留部８ｆは最大で上り部８ｃの上端、即ち溢れ面Ｏまで封水を形成することができる。そして、封水形成時において、第一屈曲部８ｂを挟んだ封水の上流側の水面と、下流側の水面の高さは等しくなる。 Here, in the water-sealed drain trap 8, when the drainage flows into the inside, the first descending portion 8a, the first bent portion 8b, and the ascending portion 8c form a sealed water storage portion 8f to store the drainage inside. And form a water seal. Further, the sealed water storage portion 8f of this embodiment can form a sealed water up to the upper end of the ascending portion 8c, that is, the overflow surface O. Then, at the time of forming the sealing water, the heights of the water surface on the upstream side and the water surface on the downstream side of the sealing water sandwiching the first bent portion 8b become equal.

吸気弁３は、吸気口３ｂ及び吸気口３ｂに連通する配管接続部３ｃを備えた吸気弁本体３ａと、吸気弁本体３ａ内部に上下動可能に配置され、降下時には吸気口３ｂを閉塞し、上昇時には吸気口３ｂを開口する弁部材３ｄと、該弁部材３ｄを吸気口３ｂ側に常時付勢するスプリング部材３ｅと、から構成されてなる。該吸気弁３では、吸気弁本体３ａの配管接続部３ｃ側に負圧が発生した場合は、スプリング部材３ｅの付勢に抗して弁部材３ｄが吸気口３ｂから離間して配管接続部３ｃ側に外気を供給し、それ以外の状態、即ち配管接続部３ｃ側に正圧が発生した状態、または負圧も正圧も発生していない状態では、弁部材３ｄが吸気口３ｂに当接して、配管の内外の連通を防止し、配管内部の排水や臭気等の流体が配管外に漏れることを防ぐ。
尚、後述する逆流防止弁継手５に接続されるＬ字形状管体Ｌにも吸気弁が取り付けられているが、当該吸気弁は上記封水式排水トラップ８に取り付けられている吸気弁３と同一であるため、同一の符号を付してその説明を省略する。 The intake valve 3 is arranged so as to be vertically movable inside the intake valve main body 3a and the intake valve main body 3a having a pipe connecting portion 3c communicating with the intake port 3b and the intake port 3b, and closes the intake port 3b when descending. It is composed of a valve member 3d that opens the intake port 3b when ascending, and a spring member 3e that constantly urges the valve member 3d toward the intake port 3b. In the intake valve 3, when a negative pressure is generated on the pipe connection portion 3c side of the intake valve main body 3a, the valve member 3d is separated from the intake port 3b against the urging of the spring member 3e and the pipe connection portion 3c. The valve member 3d comes into contact with the intake port 3b in a state where outside air is supplied to the side and a positive pressure is generated on the pipe connection portion 3c side, or neither a negative pressure nor a positive pressure is generated. This prevents communication between the inside and outside of the pipe and prevents fluids such as drainage and odor inside the pipe from leaking to the outside of the pipe.
An intake valve is also attached to the L-shaped pipe body L connected to the check valve joint 5 described later, and the intake valve is the intake valve 3 attached to the water-sealed drain trap 8. Since they are the same, they are designated by the same reference numerals and the description thereof will be omitted.

直線状管体Ｓは、塩ビ素材等硬質の樹脂からなる略円筒形状にして直線状の管体である。 The linear tubular body S is a substantially cylindrical tubular body made of a hard resin such as a vinyl chloride material and has a linear shape.

逆流防止弁継手５は、排水管の途中部分に備えられる部材であって、以下に記載するケース部材６と、該ケース部材６内部に収納される、逆流防止弁１を備えた逆流防止弁ユニット７と、から構成される。
ケース部材６は、側面に円形の取出口６ａを備えた箱体形状を成す部材であって、上面及び下面に、管体を接続するためのソケット部６ｂを備えてなり、また側面であって取出口６ａの対向位置に、吸気弁３に繋がるＬ字形状管体Ｌを接続するための吸気弁接続部６ｃを備えてなる。
尚、図３より明らかなように、ケース部の側面に設けられた吸気弁接続部６ｃは、施工完了時、逆流防止弁１の外側、つまり下流側となる空間側に対して連通するように設けられてなる。 The check valve joint 5 is a member provided in the middle portion of the drain pipe, and is a check valve unit including the case member 6 described below and the check valve 1 housed inside the case member 6. It is composed of 7.
The case member 6 is a box-shaped member having a circular outlet 6a on the side surface, and has socket portions 6b for connecting the pipe body on the upper surface and the lower surface, and is also a side surface. An intake valve connecting portion 6c for connecting an L-shaped pipe body L connected to the intake valve 3 is provided at a position facing the outlet 6a.
As is clear from FIG. 3, the intake valve connecting portion 6c provided on the side surface of the case portion communicates with the outside of the check valve 1, that is, the space side on the downstream side when the construction is completed. It is provided.

逆流防止弁ユニット７は、上下に貫通する貫通孔７ｂを有する板状の部材であるユニット本体７ａと、該ユニット本体７ａの側面に回動自在に取り付けられる円形形状を成す蓋部７ｃと、から構成される。逆流防止弁ユニット７を、ケース部材６内に配置収納した際に、ユニット本体７ａの貫通孔７ｂの上端はケース部材６の上方のソケット部６ｂに連通し、貫通孔７ｂの下端は後述する逆流防止弁１の開口部１ｂに接続される。
また、逆流防止弁ユニット７を、ケース部材６内に配置収納した際に、蓋部７ｃは回転ロック構造を利用し、ケース部材６の取出口６ａを閉塞する。この蓋部７ｃの回転ロックを行うことで、上記した、ユニット本体７ａの上端と部材の上方のソケット部６ｂとの連通状態が維持固定される。 The check valve unit 7 is composed of a unit body 7a, which is a plate-shaped member having through holes 7b penetrating vertically, and a lid portion 7c having a circular shape, which is rotatably attached to the side surface of the unit body 7a. It is composed. When the check valve unit 7 is arranged and stored in the case member 6, the upper end of the through hole 7b of the unit body 7a communicates with the socket portion 6b above the case member 6, and the lower end of the through hole 7b is the backflow described later. It is connected to the opening 1b of the prevention valve 1.
Further, when the check valve unit 7 is arranged and stored in the case member 6, the lid portion 7c uses the rotation lock structure to close the outlet 6a of the case member 6. By performing the rotation lock of the lid portion 7c, the communication state between the upper end of the unit main body 7a and the socket portion 6b above the member is maintained and fixed.

逆流防止弁１は、シリコンゴム等、弾性を有する素材からなり、略円筒形状の本体部１ａと、本体部１ａの上流側の端部に備えた開口部１ｂと、本体部１ａの対向する面同士が漸次近接するように設けた傾斜部１ｃと、該両傾斜部１ｃの先端に設けた薄膜状部分の、向かい合って当接する面である当接面２ａ同士が当接すると共に、当接面２ａを形成する薄膜状部分の両端が互いに繋がって構成されて形成される閉塞部２と、から構成されてなる。
閉塞部２について詳述すると、該閉塞部２は、薄膜状部分に設けた当接面２ａの弾性により、逆流防止弁１に応力が作用しない状態、及び、逆流防止弁１の下流側が上流側より液体／気体の別なく圧力の高い場合では、当接面２ａ同士が当接して排水配管の流路を閉塞するように構成されてなる。これによって、下流側から排水の逆流が発生しても、逆流防止弁１は流路の閉塞を維持するため、逆流防止弁１よりも上流側への逆流を防止することができる。
一方、適正な排水の流れ、即ち上流側から下流側へ排水の流れが発生した場合には、逆流防止弁１の上流側に排水が流入して、逆流防止弁１内部乃至上流側にある程度まで排水が溜まることで、当接面２ａ同士が上流側の圧力によって離間し、閉塞部２が開口して上流側から下流側への排水が行われる。 The check valve 1 is made of an elastic material such as silicon rubber, and has a substantially cylindrical main body portion 1a, an opening 1b provided at an upstream end portion of the main body portion 1a, and a facing surface of the main body portion 1a. The contact surfaces 2a, which are the surfaces of the inclined portions 1c provided so as to gradually approach each other and the thin film-like portions provided at the tips of the two inclined portions 1c, which are in contact with each other, are in contact with each other, and the contact surfaces 2a It is composed of a closed portion 2 formed by connecting both ends of the thin film-like portion forming the above to each other.
More specifically, the closed portion 2 is in a state where stress does not act on the check valve 1 due to the elasticity of the contact surface 2a provided in the thin film-shaped portion, and the downstream side of the check valve 1 is the upstream side. When the pressure is higher regardless of whether it is a liquid or a gas, the contact surfaces 2a are configured to come into contact with each other to block the flow path of the drainage pipe. As a result, even if the backflow of drainage occurs from the downstream side, the backflow prevention valve 1 maintains the blockage of the flow path, so that the backflow to the upstream side of the backflow prevention valve 1 can be prevented.
On the other hand, when a proper drainage flow, that is, a drainage flow occurs from the upstream side to the downstream side, the drainage flows into the upstream side of the check valve 1 to a certain extent inside or upstream of the check valve 1. When the drainage is collected, the contact surfaces 2a are separated from each other by the pressure on the upstream side, the closing portion 2 is opened, and the drainage is performed from the upstream side to the downstream side.

上記した各部材から構成される、逆流防止弁１を備えた配管構造は、以下のようにして施工され、排水を下水側に排出する。
まず、直線状管体Ｓを介して、封水式排水トラップ８の上流側端部を、排水機器の排水口の配管に接続する。又、封水式排水トラップ８の第二屈曲部８ｄ上面の開口に吸気弁３を接続する。
次に、Ｌ字形状管体Ｌの一端を逆流防止弁継手５のケース部材６の吸気弁接続部６ｃに、他端を吸気弁本体３ａの配管接続部３ｃに、それぞれ接続する。
次に、ケース部材６の上方のソケット部６ｂを、直線状管体Ｓを介して封水式排水トラップ８の下流側の端部に、またケース部材６の下方のソケット部６ｂを、直線状管体Ｓを介して下水側の配管に、それぞれ接続する。
更に、ケース部材６の取出口６ａから、逆流防止弁１を取り付けた逆流防止弁ユニット７をケース部材６の内部に挿入し、取出口６ａを蓋部７ｃにて閉塞させた上で、回転ロックにて接続固定して、本発明の第一実施例の逆流防止弁１を備えた配管構造の施工が完了する。 The piping structure provided with the check valve 1 composed of the above-mentioned members is constructed as follows, and drainage is discharged to the sewage side.
First, the upstream end of the water-sealed drain trap 8 is connected to the drain port pipe of the drain device via the linear pipe body S. Further, the intake valve 3 is connected to the opening on the upper surface of the second bent portion 8d of the water-sealed drain trap 8.
Next, one end of the L-shaped pipe body L is connected to the intake valve connecting portion 6c of the case member 6 of the check valve joint 5, and the other end is connected to the pipe connecting portion 3c of the intake valve main body 3a.
Next, the socket portion 6b above the case member 6 is linearly attached to the downstream end of the water-sealing drain trap 8 via the linear pipe body S, and the socket portion 6b below the case member 6 is linear. It is connected to the pipe on the sewage side via the pipe body S, respectively.
Further, from the outlet 6a of the case member 6, the check valve unit 7 to which the check valve 1 is attached is inserted into the case member 6, the outlet 6a is closed by the lid portion 7c, and then the rotation lock is performed. The construction of the piping structure provided with the check valve 1 according to the first embodiment of the present invention is completed.

上記のように構成した配管構造において、配管を接続した排水機器を使用し、排水が発生すると、排水は設備機器に備えられた排水口から、直線状管体Ｓを介し、封水式排水トラップ８内部を通過し、ケース部材６の上流側から、逆流防止弁継手５内部に流入する。逆流防止弁継手５内の排水の流れを詳述すると、ケース部材６の上方のソケット部６ｂから、ユニット本体７ａの貫通孔７ｂを介し、逆流防止弁１の内側、即ち上流側に排水が流入して、逆流防止弁１内部から、その上流側の貫通孔７ｂ内部、または更にその上流側のソケット部６ｂに接続されている直線状管体Ｓの内部に、ある程度まで排水が溜まる。このように排水が溜まって、閉塞部２に作用する水圧がある程度上昇すると、図５乃至図８に示したような、閉塞部２が閉口した状態から、図９及び図１０に示したように、当接面２ａ同士が上流側の水圧によって離間した状態となり、閉塞部２が開口して上流側から下流側への排水が行われる。排水が完了し、逆流防止弁１の内部に作用する水圧が減少すると、逆流防止弁１の弾性によって当接面２ａ同士が再び当接することで、閉塞部２が、図５乃至図８に示したような閉塞した状態に戻る。
一方、下流側から排水又は気体など、流体の逆流が発生した場合、閉塞部２を成す当接面２ａは、外側から内側に向かって逆流する流体の圧力を受けることとなり、当接面２ａ同士がより強く当接して閉塞部２の閉塞が維持され、逆流防止弁１よりも上流側に、臭気などの気体や排水などの液体が逆流することを防ぐ。
尚、上記のように、特に逆流防止弁１の下流側に負圧が発生していない状態では、吸気弁３はスプリング部材３ｅの付勢によって吸気口３ｂを弁部材３ｄにより閉塞した状態を維持しており、配管内部の排水や臭気などが配管構造の外側に流出することを防止すると共に、配管構造内の流体の流れに対しても特に大きな影響を与えることは無い。 In the piping structure configured as described above, when drainage is generated by using a drainage device to which the pipes are connected, the drainage is discharged from the drainage port provided in the equipment through the linear pipe body S and the water-sealed drainage trap. It passes through the inside of the 8 and flows into the inside of the check valve joint 5 from the upstream side of the case member 6. To elaborate the flow of drainage in the check valve joint 5, drainage flows from the socket portion 6b above the case member 6 to the inside of the check valve 1, that is, the upstream side, through the through hole 7b of the unit body 7a. Then, drainage is collected to some extent from the inside of the check valve 1 to the inside of the through hole 7b on the upstream side of the check valve 1 or the inside of the linear pipe body S connected to the socket portion 6b on the upstream side thereof. When the drainage is accumulated in this way and the water pressure acting on the closed portion 2 rises to some extent, the closed portion 2 is changed from the closed state as shown in FIGS. 5 to 8 as shown in FIGS. 9 and 10. The contact surfaces 2a are separated from each other by the water pressure on the upstream side, the closing portion 2 is opened, and drainage is performed from the upstream side to the downstream side. When the drainage is completed and the water pressure acting on the inside of the check valve 1 decreases, the contact surfaces 2a come into contact with each other again due to the elasticity of the check valve 1, so that the closing portion 2 is shown in FIGS. 5 to 8. It returns to the closed state.
On the other hand, when a backflow of a fluid such as drainage or gas occurs from the downstream side, the contact surface 2a forming the closing portion 2 receives the pressure of the fluid flowing back from the outside to the inside, and the contact surfaces 2a meet each other. Is more strongly abutted to maintain the closure of the closed portion 2, and prevents gas such as odor and liquid such as drainage from flowing back to the upstream side of the check valve 1.
As described above, especially in a state where no negative pressure is generated on the downstream side of the check valve 1, the intake valve 3 maintains a state in which the intake port 3b is closed by the valve member 3d due to the urging of the spring member 3e. This prevents drainage and odors inside the pipe from flowing out to the outside of the pipe structure, and does not have a particularly large effect on the flow of fluid in the pipe structure.

上記した逆流防止弁１を備えた配管構造において、自己サイホン現象や誘導サイホン現象等、何らかの理由で封水の下流側の水面と逆流防止弁１との間の空間Ｒが負圧となると、封水式排水トラップ８の第二屈曲部８ｄ上面に設けられた開口を介して吸気弁本体３ａの配管接続部３ｃに負圧が作用する。これにより、吸気弁３の弁部材３ｄが、スプリング部材３ｅの付勢に抗して吸気口３ｂから離間し、図１１から図１２に示す状態へと移行し、下流側の配管内部に外気を供給する。このため、空間Ｒ内の負圧は解消され、封水の上流側と下流側の気圧が等しくなることから、封水の上流側と下流側の水位は等しくなる。
尚、この弁部材３ｄが吸気口３ｂから離間した状態では、吸気口３ｂの内外が連通する状態となるが、この時は配管構造の外側から内側に向けての気圧による流れが発生しているため、配管構造の内部から外部へ臭気などの気体や排水などが漏れる恐れはない。
このようにして、本実施例での逆流防止弁１を備えた配管構造では、空間Ｒ内の負圧を解消することで、封水の貯留量の減少を防ぐことができる。 In the piping structure provided with the check valve 1 described above, if the space R between the water surface on the downstream side of the sealed water and the check valve 1 becomes negative pressure for some reason such as a self-siphon phenomenon or an induction siphon phenomenon, the seal is sealed. A negative pressure acts on the pipe connecting portion 3c of the intake valve main body 3a through the opening provided on the upper surface of the second bent portion 8d of the water type drain trap 8. As a result, the valve member 3d of the intake valve 3 is separated from the intake port 3b against the urging of the spring member 3e, shifts to the state shown in FIGS. 11 to 12, and the outside air is introduced into the piping on the downstream side. Supply. Therefore, the negative pressure in the space R is eliminated, and the air pressures on the upstream side and the downstream side of the sealed water become equal, so that the water levels on the upstream side and the downstream side of the sealed water become equal.
When the valve member 3d is separated from the intake port 3b, the inside and outside of the intake port 3b communicate with each other, but at this time, a flow due to atmospheric pressure is generated from the outside to the inside of the piping structure. Therefore, there is no risk of gas such as odor or drainage leaking from the inside of the piping structure to the outside.
In this way, in the piping structure provided with the check valve 1 in this embodiment, it is possible to prevent a decrease in the amount of sealed water stored by eliminating the negative pressure in the space R.

又、上記した逆流防止弁１を備えた配管構造において、自己サイホン現象や誘導サイホン現象等、何らかの理由で逆流防止弁１の下流側に、逆流防止弁１の閉塞部２を開口させる程の充分に強い負圧が発生すると、逆流防止弁１の下流側である、ケース部材６の吸気弁接続部６ｃから、Ｌ字形状管体Ｌを介して吸気弁本体３ａの配管接続部３ｃに負圧が作用する。これにより、吸気弁３が逆流防止弁１よりも下流側の配管内部に外気を供給する。このため、逆流防止弁１の下流側に発生した負圧は解消され、逆流防止弁１の上流側から下流側への流体、特に配管内に存在している気体の流出が無くなり、気体が閉塞部２を通過することが原因となる笛様音の発生も防止される。
このようにして、本実施例での逆流防止弁１を備えた配管構造では、逆流防止弁１の笛様音の発生を防止することができる。 Further, in the piping structure provided with the check flow prevention valve 1 described above, it is sufficient to open the closing portion 2 of the check flow prevention valve 1 on the downstream side of the check flow prevention valve 1 for some reason such as a self-siphon phenomenon or an induction siphon phenomenon. When a strong negative pressure is generated in, a negative pressure is applied from the intake valve connection portion 6c of the case member 6, which is on the downstream side of the check valve 1, to the pipe connection portion 3c of the intake valve main body 3a via the L-shaped pipe body L. Works. As a result, the intake valve 3 supplies outside air to the inside of the pipe on the downstream side of the check valve 1. Therefore, the negative pressure generated on the downstream side of the backflow prevention valve 1 is eliminated, the outflow of the fluid from the upstream side to the downstream side of the backflow prevention valve 1, especially the gas existing in the pipe, is eliminated, and the gas is blocked. The generation of whistle-like noise caused by passing through the part 2 is also prevented.
In this way, in the piping structure provided with the backflow prevention valve 1 in this embodiment, it is possible to prevent the generation of the whistle-like sound of the backflow prevention valve 1.

本発明の実施例は以上のようであるが、本発明は上記実施例に限定される物ではなく、主旨を変更しない範囲において自由に変更が可能である。
例えば、本発明が解決しようとする課題は、排水トラップの封水より下流側且つ逆流防止弁よりも上流側の排水流路内の空間が負圧の際に排水流路の閉塞を維持する構造の逆流防止弁を備えた配管構造において生じるものであるから、当該逆流防止弁は上記第一実施例において記載した逆流防止弁１に限定されるものではない。
又、上記第一実施例において、吸気部は内部に吸気口３ｂの開閉を行う弁部材３ｅを備えた吸気弁３であったが、当該吸気弁３に代えて、端部が大気中に開放されており、弁部材を有さない吸気管を採用しても良い。
又、上記第一実施例において、封水式排水トラップ８は管体を略Ｓ字形状に屈曲させ、横転させた形状を成すものであったが、椀や防臭パイプと呼ばれる筒状部材を備えた封水式排水トラップ８等、種々の形状の封水式排水トラップ８を採用しても良い。 Examples of the present invention are as described above, but the present invention is not limited to the above examples, and can be freely changed without changing the gist.
For example, the problem to be solved by the present invention is a structure that maintains the blockage of the drainage flow path when the space in the drainage flow path on the downstream side of the sealing water of the drainage trap and on the upstream side of the check valve is negative pressure. The check valve is not limited to the check valve 1 described in the first embodiment because it occurs in the piping structure provided with the check valve.
Further, in the first embodiment, the intake portion is an intake valve 3 provided with a valve member 3e for opening and closing the intake port 3b inside, but instead of the intake valve 3, the end portion is open to the atmosphere. An intake pipe that does not have a valve member may be adopted.
Further, in the first embodiment, the water-sealed drain trap 8 has a shape in which the pipe body is bent into a substantially S shape and rolled over, but it is provided with a tubular member called a bowl or a deodorant pipe. Various shapes of the water-sealing type drain trap 8 such as the water-sealing type drain trap 8 may be adopted.

１逆流防止弁１ａ本体部
１ｂ開口部１ｃ傾斜部
２閉塞部２ａ当接面
３吸気弁３ａ吸気弁本体
３ｂ吸気口３ｃ配管接続部
３ｄ弁部材３ｅスプリング部材
５逆流防止弁継手６ケース部材
６ａ取出口６ｂソケット部
６ｃ吸気弁接続部７逆流防止弁ユニット
７ａユニット本体７ｂ貫通孔
７ｃ蓋部８封水式排水トラップ
８ａ第一下り部８ｂ第一屈曲部
８ｃ上り部８ｄ第二屈曲部
８ｅ第二下り部８ｆ封水貯留部
Ｏ溢れ面Ｒ空間
ＬＬ字形状管体Ｓ直線状管体 1 Backflow prevention valve 1a Main body 1b Opening 1c Inclined 2 Closure 2a Contact surface 3 Intake valve 3a Intake valve body 3b Intake port 3c Piping connection 3d Valve member 3e Spring member 5 Backflow prevention valve joint 6 Case member 6a Outlet 6b Socket part 6c Intake valve connection part 7 Backflow prevention valve unit 7a Unit body 7b Through hole 7c Lid part 8 Water-sealing drain trap 8a First down part 8b First bending part 8c Up part 8d Second bending part 8e Second Downward part 8f Sealed water storage part O Overflow surface R Space L L-shaped pipe body S Straight pipe body

Claims

内部に排水を貯留し、封水を形成する排水トラップと、
下流側からの排水や臭気の逆流を防止する逆流防止弁と、
配管外の大気を排水流路内へ流入させる吸気部からなり、
上記逆流防止弁は、排水トラップの下流側の排水流路内に配置され、排水トラップの封水より下流側且つ逆流防止弁よりも上流側の排水流路内の空間が負圧の際において排水流路の閉塞を維持する構造であって、
上記排水トラップは、管体を略Ｓ字形状に屈曲させた部材であって、第一屈曲部及び第二屈曲部を有し、
上記吸気部は第二屈曲部上面に設けた突出部分の上方に配置され、排水トラップ側に負圧が発生した場合は、排水トラップ側に外気を供給し、それ以外の状態では配管の内外の連通を防止し、配管内部の排水や臭気等の流体が配管外に漏れることを防ぐ弁部材と吸気口を備えてなるとともに、
前記逆流防止弁の下流側に配管外の大気を配管内に吸気する吸気部を備えたことを特徴とする配管構造。 A drain trap that stores drainage inside and forms a seal,
A check valve that prevents drainage from the downstream side and backflow of odors,
It consists of an intake part that allows the air outside the pipe to flow into the drainage channel.
The check valve is arranged in the drain flow path on the downstream side of the drain trap, and drains when the space in the drain flow path on the downstream side of the sealing water of the drain trap and on the upstream side of the backflow prevention valve is negative pressure. A structure that maintains the blockage of the flow path
The drain trap is a member in which a pipe body is bent into a substantially S shape, and has a first bent portion and a second bent portion.
The intake portion is arranged above the protruding portion provided on the upper surface of the second bent portion, and when a negative pressure is generated on the drain trap side, outside air is supplied to the drain trap side, and in other states, inside and outside the pipe. to prevent communication, fluid drainage and odors of internal piping, such a valve member and inlet to prevent leaking outside pipe Rutotomoni,
A piping structure characterized in that an intake portion for sucking air outside the piping into the piping is provided on the downstream side of the check valve .

前記逆流防止弁は、逆流防止弁に応力が作用していない状態において排水流路の閉塞を維持する構造であることを特徴とする請求項１に記載の配管構造。 The piping structure according to claim 1, wherein the check valve has a structure that maintains the blockage of the drainage flow path in a state where stress is not applied to the check valve.

前記逆流防止弁は略筒体状にして弾性を有する素材からなり、
下流側に進むにつれて、対向する面に対して漸次近接するよう傾斜を設けた傾斜面と、
逆流防止弁に応力が作用していない状態において、前記傾斜面が対向する面と当接面によって当接することで形成される閉塞部を備えることを特徴とする請求項１乃至請求項２のいずれか一つに記載の配管構造。 The check valve is made of an elastic material that has a substantially tubular shape.
An inclined surface that is inclined so as to gradually approach the opposite surface as it advances to the downstream side,
Any of claims 1 and 2 , wherein the check valve is provided with a closed portion formed by abutting the inclined surface with the facing surface by the contact surface in a state where no stress is applied to the check valve. The piping structure described in one.