JP2017179759A - Check valve - Google Patents

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JP2017179759A
JP2017179759A JP2016065029A JP2016065029A JP2017179759A JP 2017179759 A JP2017179759 A JP 2017179759A JP 2016065029 A JP2016065029 A JP 2016065029A JP 2016065029 A JP2016065029 A JP 2016065029A JP 2017179759 A JP2017179759 A JP 2017179759A
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upstream
downstream
annular portion
backflow prevention
prevention valve
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JP6649829B2 (en
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道浩 清水
Michihiro Shimizu
道浩 清水
達也 緑川
Tatsuya Midorikawa
達也 緑川
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Sekisui Chemical Co Ltd
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Sekisui Chemical Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a check valve of a simple structure that may be installed at a low cost.SOLUTION: A check valve is installed in a container, and includes: an upstream-side annular part inserted into an inflow pipe connecting port for having drainage flow into the container; a downstream-side annular part inserted into a drain pipe connecting port for draining the drainage from the container; an invert part connecting the upstream-side annular part with the downstream-side annular part; and an upstream-side valve body provided on an edge part of the upstream-side annular part on an outflow side for opening/closing an opening formed on the outflow side of the upstream-side annular part, or a downstream-side valve body provided on an edge part on an outflow side of the downstream-side annular part for opening/closing an opening formed on the outflow side of the downstream-side annular part. An outer peripheral surface of the downstream-side annular part and an inner peripheral surface of the drain pipe connecting port are engaged for holding the check valve.SELECTED DRAWING: Figure 1

Description

本発明は、マスに設置する逆流防止弁に関するものである。   The present invention relates to a backflow prevention valve installed in a mass.

従来、集中豪雨や台風などの大雨時に下水本管からマスを介して宅内に汚水が逆流するのを防止するためや、下水本管からマスを介して悪臭が宅内に進入するのを防止するために既設のマスに逆流防止弁を設置することが行われている。特許文献１には、取付けマスの内部から取付けマスと下水本管とを接続する取付け管の入り口に挿入され、鍔により取付け管の入り口端面に係止される逆止弁が開示されている。また特許文献２には、立ち上がり管部を有するマスに用いられ、排水が流入口へ逆流するのを防止する逆流防止弁が開示されている。この逆流防止弁においては、立ち上がり管部の内面に沿う円筒状に形成された連結部が設けられており、この連結部によりマス内の所定の位置に逆流防止弁が固定されている。   Conventionally, to prevent sewage from flowing back into the house from the sewage main through the mass during heavy rain such as torrential rain or typhoon, or to prevent bad odors from entering the house from the sewage main through the mass. A backflow prevention valve is installed in an existing mass. Patent Document 1 discloses a check valve that is inserted from the inside of the mounting mass into the inlet of the mounting pipe that connects the mounting mass and the sewage main pipe, and is locked to the inlet end surface of the mounting pipe by a ridge. Patent Document 2 discloses a backflow prevention valve which is used for a mass having a rising pipe portion and prevents drainage from flowing back to the inflow port. In this backflow prevention valve, a connecting portion formed in a cylindrical shape along the inner surface of the rising pipe portion is provided, and the backflow prevention valve is fixed at a predetermined position in the mass by this connecting portion.

実開昭６３−１４１２７４号公報Japanese Utility Model Publication No. 63-141274 特許５０６８７０８号公報Japanese Patent No. 5068708

ところで特許文献１に開示されている逆止弁は、取付けマスと下水本管とを接続する取付け管の入り口に鍔により係止する構造であるため、多量の排水が取付け管を逆流した場合には、逆止弁が取付け管の入り口から外れる恐れがある。また特許文献２に開示されている逆流防止弁は、連結部によりマス内の所定の位置に固定されているが、連結部が複雑な構造を有しており、更に既設のマスに取り付ける際に施工に手間がかかるためコスト高になるという問題を有する。   By the way, since the check valve currently disclosed by patent document 1 is a structure latched by the hook at the entrance of the attachment pipe which connects an attachment mass and a sewage main pipe, when a lot of drainage flows back through an attachment pipe The check valve may come off from the inlet of the mounting pipe. In addition, the backflow prevention valve disclosed in Patent Document 2 is fixed at a predetermined position in the mass by the connecting portion, but the connecting portion has a complicated structure, and when it is attached to an existing mass. There is a problem that the construction is troublesome and the cost is high.

本発明の目的は、簡易な構造を有し低コストでマスに設置することができる逆流防止弁を提供することである。   An object of the present invention is to provide a check valve that has a simple structure and can be installed on a mass at low cost.

本発明の逆流防止弁は、マス内に設置する逆流防止弁であって、前記マスに排水を流入させる流入管接続口に挿入する上流側環状部と、前記マスから前記排水を排出させる排出管接続口に挿入する下流側環状部と、前記上流側環状部と前記下流側環状部を接続するインバート部と、前記上流側環状部の流出側の端部に設けられ前記上流側環状部の流出側に形成される開口を開閉自在とする上流側弁体または前記下流側環状部の流出側の端部に設けられ前記下流側環状部の流出側に形成される開口を開閉自在とする下流側弁体と、を有し、前記下流側環状部の外周面と前記排出管接続口の内周面とが係止することにより保持されることを特徴とする。   The backflow prevention valve of the present invention is a backflow prevention valve installed in a mass, and is an upstream side annular portion that is inserted into an inlet pipe connection port for allowing wastewater to flow into the mass, and a discharge pipe for discharging the wastewater from the mass. A downstream annular portion inserted into a connection port, an invert portion connecting the upstream annular portion and the downstream annular portion, and an outflow of the upstream annular portion provided at an end on the outflow side of the upstream annular portion An upstream valve body that allows opening and closing of an opening formed on the side, or a downstream side that is provided at an end on the outflow side of the downstream annular portion and that allows opening and closing of an opening formed on the outflow side of the downstream annular portion And a valve body, wherein the outer peripheral surface of the downstream annular portion and the inner peripheral surface of the discharge pipe connection port are held and held.

また本発明の逆流防止弁は、前記上流側弁体は前記上流側環状部の流出側に形成される開口を塞いだ時に、前記上流側環状部の中心と前記下流側環状部の中心とを結ぶ線と成す角度θが３０°〜６０°となるように設置され、前記下流側弁体は前記下流側環状部の流出側に形成される開口を塞いだ時に、前記上流側環状部の中心と前記下流側環状部の中心とを結ぶ線と成す角度θが３０°〜６０°となるように設置されることを特徴とする。   In the check valve of the present invention, when the upstream valve body closes an opening formed on the outflow side of the upstream annular portion, the upstream annular portion and the downstream annular portion are centered. The angle θ formed with the connecting line is set to be 30 ° to 60 °, and when the downstream valve body closes the opening formed on the outflow side of the downstream annular portion, the center of the upstream annular portion And an angle θ formed with a line connecting the center of the downstream annular portion and the center of the downstream annular portion is set to be 30 ° to 60 °.

また本発明の逆流防止弁は、前記上流側弁体及び前記下流側弁体の流出側の面に凹部を備えることを特徴とする。   The backflow prevention valve of the present invention is characterized in that a recess is formed on the outflow side surface of the upstream valve body and the downstream valve body.

また本発明の逆流防止弁は、前記上流側弁体が前記流出側の面に第１把持部を備えること特徴とする。   In the check valve according to the present invention, the upstream valve body includes a first gripping portion on the outflow side surface.

また本発明の逆流防止弁は、前記上流側環状部及び前記下流側環状部の上部に第２把持部を備えること特徴とする。   Moreover, the backflow prevention valve of this invention is equipped with a 2nd holding part in the upper part of the said upstream annular part and the said downstream annular part.

また本発明の逆流防止弁は、前記上流側環状部及び前記下流側環状部の少なくとも一方の底面にスリットが形成されていること特徴とする。   The backflow prevention valve of the present invention is characterized in that a slit is formed on the bottom surface of at least one of the upstream annular portion and the downstream annular portion.

また本発明の逆流防止弁は、前記インバート部が前記逆流防止弁を前記上流側環状部側と前記下流側環状部側とに分割する分割部を有することを特徴とする。   The backflow prevention valve of the present invention is characterized in that the invert part has a split part that divides the backflow prevention valve into the upstream annular part side and the downstream annular part side.

また本発明の逆流防止弁は、前記上流側環状部の外周面には止水部が形成されていることを特徴とする。   The backflow prevention valve of the present invention is characterized in that a water stop portion is formed on the outer peripheral surface of the upstream annular portion.

本発明によれば、簡易な構造を有し低コストでマスに設置することができる逆流防止弁を提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the backflow prevention valve which has a simple structure and can be installed in a mass at low cost can be provided.

本発明の実施の形態に係る逆流防止弁の斜視図である。It is a perspective view of the backflow prevention valve which concerns on embodiment of this invention. 本発明の実施の形態に係る逆流防止弁の側面図である。It is a side view of the backflow prevention valve which concerns on embodiment of this invention. 本発明の実施の形態に係る逆流防止弁をマスに設置する工程を示す図である。It is a figure which shows the process of installing the backflow prevention valve which concerns on embodiment of this invention in a mass. 本発明の実施の形態に係る逆流防止弁をマスに設置する工程を示す図である。It is a figure which shows the process of installing the backflow prevention valve which concerns on embodiment of this invention in a mass. 本発明の他の実施の形態に係る逆流防止弁の側面図である。It is a side view of the backflow prevention valve which concerns on other embodiment of this invention. 本発明の他の実施の形態に係る逆流防止弁の底面図である。It is a bottom view of the backflow prevention valve which concerns on other embodiment of this invention. 本発明の他の実施の形態に係る逆流防止弁の側面図である。It is a side view of the backflow prevention valve which concerns on other embodiment of this invention. 本発明の他の実施の形態に係る弁体の斜視図である。It is a perspective view of the valve body which concerns on other embodiment of this invention.

以下、図面を参照して、本発明の実施の形態に係る逆流防止弁について説明する。図１は実施の形態に係る逆流防止弁の斜視図であり、図２は実施の形態に係る逆流防止弁の側面図である。図１及び図２に示す逆流防止弁２は、マス２０（図３、図４参照）内に設置され、マス２０から流入管接続口２２（図３、図４参照）を介して宅内に排水が逆流するのを防止するためのものである。   Hereinafter, a backflow prevention valve according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a check valve according to the embodiment, and FIG. 2 is a side view of the check valve according to the embodiment. The backflow prevention valve 2 shown in FIG.1 and FIG.2 is installed in the mass 20 (refer FIG.3, FIG.4), and drains into the house from the mass 20 via the inflow pipe connection port 22 (refer FIG.3, FIG.4). This is to prevent reverse flow.

マス２０は、地中に埋設して設置されるもので、少なくとも、地上開口部（図示せず）と、地上開口部とマス２０の上部開口部とを接続する縦管（図示せず）と、流入管接続口２２と、流出管接続口２４と、流入管接続口２２と流出管接続口２４とを接続するインバートと、を備えている。また、流入管接続口２２には上流の宅内からの排水を搬送する流入管（図示せず）が接続され、流出管接続口２４には下流にある下水本管へ排水を搬送する流出管（図示せず）が接続される。   The mass 20 is embedded and installed in the ground, and includes at least a ground opening (not shown) and a vertical pipe (not shown) that connects the ground opening and the upper opening of the mass 20. , An inflow pipe connection port 22, an outflow pipe connection port 24, and an invert for connecting the inflow pipe connection port 22 and the outflow pipe connection port 24. The inflow pipe connection port 22 is connected to an inflow pipe (not shown) for transporting waste water from the upstream house, and the outflow pipe connection port 24 is an outflow pipe for transporting waste water to the downstream sewage main pipe ( (Not shown) are connected.

逆流防止弁２は、マス２０に排水を流入させる流入管接続口２２に挿入される上流側環状部４と、マス２０から排水を排出させる排出管接続口２４に挿入される下流側環状部６と、上流側環状部４と下流側環状部６を接続するインバート部８を備えており、例えば塩化ビニルなどの樹脂により形成されている。   The backflow prevention valve 2 includes an upstream annular portion 4 that is inserted into the inflow pipe connection port 22 that allows drainage to flow into the mass 20, and a downstream annular portion 6 that is inserted into the discharge pipe connection port 24 that discharges drainage from the mass 20. And the invert part 8 which connects the upstream side annular part 4 and the downstream side annular part 6 is provided, for example, is formed of resin such as vinyl chloride.

上流側環状部４は、上流側環状部４の外径が流入管接続口２２の内径よりも僅かに小さく形成されており流入管接続口２２に挿入され、上流側環状部４の外径と流入管接続口２２の内径とが一致する箇所で互いに係止し、止水される。上流側環状部４の外壁には周状に止水部４ａが形成されており、止水部４ａにより上流側環状部４の外周面と流入管接続口２２の内周面との間が止水されていても良い。ここで止水部４ａには、例えばブチルテープや平板ゴムなどが用いられ、平ゴムにはスチレンゴム、エチレンプロピレンゴム、クロロプレンゴムなどが用いられる。   The upstream annular portion 4 is formed so that the outer diameter of the upstream annular portion 4 is slightly smaller than the inner diameter of the inflow pipe connection port 22 and is inserted into the inflow pipe connection port 22. The inflow pipe connection ports 22 are locked to each other at a place where the inner diameter of the inflow pipe connection port 22 matches, and water is stopped. A water stop portion 4 a is formed on the outer wall of the upstream annular portion 4 in a circumferential shape, and the water stop portion 4 a stops between the outer peripheral surface of the upstream annular portion 4 and the inner peripheral surface of the inflow pipe connection port 22. It may be watered. Here, for example, butyl tape or flat rubber is used for the water stop portion 4a, and styrene rubber, ethylene propylene rubber, chloroprene rubber, or the like is used for the flat rubber.

上流側環状部４のインバート部８側である流出側には、端面が斜め上方向に向く傾斜端面４ｂが形成されている。上流側環状部４のインバート部８側の上部には、ヒンジ１０が設けられこのヒンジ１０に上流側弁体１２が取り付けられている。上流側弁体１２は、インバート部８の両側部の上面８ａに当接する段部１２ａを両側部に備える円板形状を有し、上流側環状部４のインバート部８側の傾斜端面４ｂにより形成される開口を開閉自在に塞ぐ。また上流側弁体１２は、流出側の面に凹部１２ｂを備えている。   On the outflow side, which is the invert portion 8 side of the upstream annular portion 4, an inclined end surface 4 b whose end surface is directed obliquely upward is formed. A hinge 10 is provided at an upper portion of the upstream annular portion 4 on the invert portion 8 side, and an upstream valve body 12 is attached to the hinge 10. The upstream-side valve body 12 has a disk shape provided on both sides with stepped portions 12a that contact the upper surfaces 8a on both sides of the invert portion 8, and is formed by the inclined end surface 4b on the invert portion 8 side of the upstream-side annular portion 4. The opening to be opened is closed freely. The upstream valve body 12 includes a recess 12b on the outflow side.

ここで上流側弁体１２は、上流側環状部４の流出側に形成された開口を塞いだ時に、上流側環状部４の中心と下流側環状部６の中心とを結ぶ線と成す角度θが３０°〜６０°、好ましくは４０°〜５０°、更に好ましくは４５°となるように設置されている。上流側弁体１２は、上流側環状部４の内側から押されると外側に開き、上流側環状部４の外側から押されると傾斜端面４ｂにより形成される開口を塞ぐ。なお、上流側環状部４の中心（下流側環状部６の中心）とは、上流側環状部４（下流側環状部６）の断面の中心を指す。   Here, the upstream valve body 12 has an angle θ formed with a line connecting the center of the upstream annular portion 4 and the center of the downstream annular portion 6 when the opening formed on the outflow side of the upstream annular portion 4 is closed. Is 30 ° to 60 °, preferably 40 ° to 50 °, and more preferably 45 °. The upstream valve body 12 opens outward when pressed from the inside of the upstream annular portion 4 and closes the opening formed by the inclined end surface 4b when pressed from the outside of the upstream annular portion 4. The center of the upstream annular portion 4 (center of the downstream annular portion 6) refers to the center of the cross section of the upstream annular portion 4 (downstream annular portion 6).

この場合に上流側弁体１２が上述の角度θとなるように設置されているため、上流側弁体１２の流入側の排水が上流側弁体１２の流入側の面と接触する面積が大きくなり、排水量が少ない場合においても上流側弁体１２が容易に開く。また上流側弁体１２は、流出側の面に凹部１２ｂを備えているため凹部１２ｂに逆流した排水が溜まることで上流側弁体１２に荷重がかかり上流側弁体１２の浮き上がりを防止することができる。   In this case, since the upstream valve body 12 is installed so as to have the above-described angle θ, the area where the drainage on the inflow side of the upstream valve body 12 contacts the inflow side surface of the upstream valve body 12 is large. Thus, even when the amount of drainage is small, the upstream valve body 12 is easily opened. Further, since the upstream valve body 12 has a recess 12b on the outflow side surface, the upstream valve body 12 is applied with a load by preventing the drained water flowing back to the recess 12b from collecting, thereby preventing the upstream valve body 12 from being lifted. Can do.

また上流側環状部４は、上部に上流側環状部４をマス２０内に設置等する際に用いる把持部１１を備えている。   Further, the upstream side annular part 4 includes a grip part 11 used when the upstream side annular part 4 is installed in the mass 20 in the upper part.

下流側環状部６の外径は、インバート部８側の外径が排出管接続口２４の内径よりも僅かに大きく形成されており、かつ下流側端部に向かって外径が小さくなるように形成されている。従って下流側環状部６の流出側端部が排出管接続口２４に挿入された場合には、排出管接続口２４の内周面と下流側環状部６の外周面の径が一致する箇所で互いに係止し、保持される。即ち下流側環状部６の外径が排出管接続口２４の内径と略同一となる位置の外周面が保持部として機能し、この保持力がインバート部８を通して上流側環状部４に伝達されることで、流入管接続口２２に挿入された上流側環状部４が宅内から流入してくる排水によって外れるのを防ぐことができる。下流側環状部６の外径が排出管接続口２４の内径と略同一となる位置には周状に止水部６ａが形成されており、止水部６ａにより下流側環状部６の外周面と排出管接続口２４の内周面との間が止水される。   The outer diameter of the downstream annular portion 6 is formed such that the outer diameter on the invert portion 8 side is slightly larger than the inner diameter of the discharge pipe connection port 24 and the outer diameter becomes smaller toward the downstream end portion. Is formed. Therefore, when the outflow side end of the downstream side annular portion 6 is inserted into the discharge pipe connection port 24, the diameter of the inner peripheral surface of the discharge pipe connection port 24 and the outer peripheral surface of the downstream side annular portion 6 is the same. Locked together and held. That is, the outer peripheral surface at a position where the outer diameter of the downstream annular portion 6 is substantially the same as the inner diameter of the discharge pipe connection port 24 functions as a holding portion, and this holding force is transmitted to the upstream annular portion 4 through the invert portion 8. Thereby, it can prevent that the upstream side annular part 4 inserted in the inflow pipe connection port 22 remove | deviates by the waste_water | drain which flows in from the house. A water stop portion 6a is formed circumferentially at a position where the outer diameter of the downstream annular portion 6 is substantially the same as the inner diameter of the discharge pipe connection port 24, and the outer peripheral surface of the downstream annular portion 6 is formed by the water stop portion 6a. And the inner peripheral surface of the discharge pipe connection port 24 are stopped.

また下流側環状部６は、上部に下流側環状部６をマス２０内に設置等する際に用いる把持部７を備えている。   The downstream-side annular portion 6 includes a gripping portion 7 that is used when the downstream-side annular portion 6 is installed in the mass 20 at the upper portion.

インバート部８は、上流側環状部４と下流側環状部６の間に位置しており、上部が開いた断面半円状の凹部を有している。インバート部８の上流側環状部４側の端部は、傾斜端面４ｂにより形成される開口の下部に接続されている。またインバート部８の下流側環状部６側の端部は、下流側環状部６により形成される開口の下部に接続されている。更にインバート部８は、逆流防止弁２を上流側環状部４側と、下流側環状部６側に分割する分割部８ｂを有している。分割部８ｂを有していることで、マス２０がすでに地中に埋設された既設のマスであっても、マス２０の地上開口部から逆流防止弁２をマス２０内に設置することができる。   The invert part 8 is located between the upstream side annular part 4 and the downstream side annular part 6 and has a semicircular concave section with an open top. An end portion of the invert portion 8 on the upstream annular portion 4 side is connected to a lower portion of an opening formed by the inclined end surface 4b. The end of the invert part 8 on the downstream annular part 6 side is connected to the lower part of the opening formed by the downstream annular part 6. Furthermore, the invert part 8 has the division part 8b which divides | segments the backflow prevention valve 2 into the upstream annular part 4 side and the downstream annular part 6 side. By having the division part 8b, the backflow prevention valve 2 can be installed in the mass 20 from the ground opening of the mass 20 even if the mass 20 is an existing mass already buried in the ground. .

この実施の形態に係る逆流防止弁２をマス２０内に設置する場合には、図３に示すように、まずマス２０内に逆流防止弁２の下流側環状部６側の部分を入れ、下流側環状部６の下流側端部を排出管接続口２４に挿入し、下流側環状部６の外周面の保持部により下流側環状部６を排出管接続口２４の端部に固定する。ここで下流側環状部６側の部分を地中１ｍ程度の深さにあり人の手の届かないマス２０内に設置する際には、把持部７を施工用の取り付け治具で掴んで設置する。これにより下流側環状部６の外周面の止水部６ａにより下流側環状部６の外周面と排出管接続口２４の内周面との間が止水される。   When the backflow prevention valve 2 according to this embodiment is installed in the mass 20, as shown in FIG. 3, the downstream side annular portion 6 side portion of the backflow prevention valve 2 is first placed in the mass 20 and then the downstream side. The downstream end of the side annular portion 6 is inserted into the discharge pipe connection port 24, and the downstream side annular portion 6 is fixed to the end of the discharge pipe connection port 24 by the holding portion on the outer peripheral surface of the downstream side annular portion 6. Here, when installing the downstream annular portion 6 side portion in the mass 20 that is about 1 m deep in the ground and cannot be reached by humans, grasp the gripping portion 7 with a construction mounting jig and install it. To do. As a result, the water stop portion 6 a on the outer peripheral surface of the downstream annular portion 6 stops water between the outer peripheral surface of the downstream annular portion 6 and the inner peripheral surface of the discharge pipe connection port 24.

次に図４に示すように、マス２０内に逆流防止弁２の上流側環状部４側の部分を入れ、上流側環状部４の上流側端部を流入管接続口２２に挿入する。ここで上流側環状部４側の部分を地中１ｍ程度の深さにあり人の手の届かないマス２０内に設置する際には、把持部１１を施工用の取り付け治具で掴んで設置する。これにより上流側環状部４の外周面の止水部４ａにより上流側環状部４の外周面と流入管接続口２２の内周面との間が止水される。   Next, as shown in FIG. 4, a portion on the upstream annular portion 4 side of the check valve 2 is inserted into the mass 20, and the upstream end portion of the upstream annular portion 4 is inserted into the inflow pipe connection port 22. Here, when installing the upstream annular portion 4 side in the mass 20 which is about 1 m deep in the ground and cannot be reached by human hands, the gripping portion 11 is held by a construction mounting jig. To do. Accordingly, the water stop portion 4 a on the outer peripheral surface of the upstream annular portion 4 stops water between the outer peripheral surface of the upstream annular portion 4 and the inner peripheral surface of the inflow pipe connection port 22.

そして逆流防止弁２の上流側環状部４側の部分を上流側環状部４の開口の中心を通る軸周りに回転させることにより、逆流防止弁２の下流側環状部６側の部分と上流側環状部４側の部分を分割している分割部８ｂを嵌合させる。これによりマス２０内における逆流防止弁２の設置が完了する。   Then, by rotating the upstream annular portion 4 side portion of the backflow prevention valve 2 around the axis passing through the center of the opening of the upstream annular portion 4, the downstream side annular portion 6 side portion and the upstream side of the backflow prevention valve 2 are rotated. The division part 8b which has divided | segmented the part by the side of the cyclic | annular part 4 is fitted. Thereby, the installation of the check valve 2 in the mass 20 is completed.

なおマス２０内の底部は、流入管接続口２２側から排出管接続口２４側に向かって低くなるように形成されているため、逆流防止弁２もマス２０内において上流側環状部４が下流側環状部６よりも高くなるように傾斜して設置される。   In addition, since the bottom part in the mass 20 is formed so as to become lower from the inflow pipe connection port 22 side toward the discharge pipe connection port 24 side, the upstream side annular part 4 is also downstream in the backflow prevention valve 2. It is installed to be inclined so as to be higher than the side annular portion 6.

この実施の形態に係る逆流防止弁２によれば、多量の雨水がマス２０に流入した場合においても宅内への排水の逆流を防止することができる。またこの実施の形態に係る逆流防止弁２は、簡易な構造を有しており、また既設のマス２０に取り付ける際に施工に手間がかからないため低コストで既設のマス２０に設置することができる。   According to the backflow prevention valve 2 according to this embodiment, even when a large amount of rainwater flows into the mass 20, backflow of drainage into the house can be prevented. The backflow prevention valve 2 according to this embodiment has a simple structure and can be installed on the existing mass 20 at a low cost because it does not take time to install the existing mass 20 when it is attached. .

図５は本発明の他の実施の形態に係る逆流防止弁４０の側面図であり、図６は逆流防止弁４０の底面図である。なお逆流防止弁４０の説明においては、逆流防止弁２の構成と同一の構成には同一の符号を用い、逆流防止弁２と異なる部分についての説明を行う。   FIG. 5 is a side view of a backflow prevention valve 40 according to another embodiment of the present invention, and FIG. 6 is a bottom view of the backflow prevention valve 40. In the description of the backflow prevention valve 40, the same components as those of the backflow prevention valve 2 are denoted by the same reference numerals, and different portions from the backflow prevention valve 2 will be described.

逆流防止弁４０は、逆流防止弁２の上流側環状部４の流入側の底部にスリット５を備えており、その他の部分においては逆流防止弁２と同一の構造を有している。スリット５は、上流側環状部４の底部の上流側弁体１２が接触する位置よりも上流側の位置に形成されている。逆流防止弁４０は、上流側環状部４の流入側の底部にスリット５を備えることにより、上流側環状部４が弾性変形し易くなり、マス２０内において上流側環状部４を流入管接続口２２に挿入し易くすることができる。また上流側環状部４の底部と流入管接続口２２の底部との段差を小さくすることができ排水中のごみが上流側環状部４の流入側に引っかかるのを防止することができる。なお、逆流防止弁４０の下流側環状部６の流出側の底部にスリットを備えるようにしてもよい。下流側環状部６の流出側の底部にスリットを備えることにより、下流側環状部６が弾性変形し易くなり、マス２０内において下流側環状部６を排出管接続口２４に挿入し易くすることができる。逆流防止弁４０の下流側環状部６の流出側の底部にスリットを備える場合に、上流側環状部４の流入側の底部にスリット５を設けないようにしてもよい。   The backflow prevention valve 40 includes a slit 5 at the bottom on the inflow side of the upstream side annular portion 4 of the backflow prevention valve 2, and has the same structure as the backflow prevention valve 2 in other portions. The slit 5 is formed at a position upstream of the position where the upstream valve body 12 contacts the bottom of the upstream annular portion 4. The backflow prevention valve 40 is provided with the slit 5 at the bottom of the inflow side of the upstream side annular part 4 so that the upstream side annular part 4 is easily elastically deformed, and the upstream side annular part 4 is connected to the inlet pipe connection port in the mass 20. 22 can be easily inserted. Further, the step between the bottom of the upstream annular portion 4 and the bottom of the inflow pipe connection port 22 can be reduced, and dust in the drainage can be prevented from being caught on the inflow side of the upstream annular portion 4. In addition, you may make it equip the bottom part of the outflow side of the downstream side annular part 6 of the backflow prevention valve 40 with a slit. By providing a slit in the bottom on the outflow side of the downstream annular portion 6, the downstream annular portion 6 is easily elastically deformed, and the downstream annular portion 6 is easily inserted into the discharge pipe connection port 24 in the mass 20. Can do. When a slit is provided at the bottom on the outflow side of the downstream annular portion 6 of the backflow prevention valve 40, the slit 5 may not be provided at the bottom on the inflow side of the upstream annular portion 4.

図７は本発明の他の実施の形態に係る逆流防止弁５０の側面図である。なお逆流防止弁５０の説明においては、逆流防止弁２の構成と同一の構成には同一の符号を用い、逆流防止弁２と異なる部分についての説明を行う。   FIG. 7 is a side view of a backflow prevention valve 50 according to another embodiment of the present invention. In the description of the backflow prevention valve 50, the same components as those of the backflow prevention valve 2 are denoted by the same reference numerals, and different portions from the backflow prevention valve 2 will be described.

逆流防止弁５０は、逆流防止弁２の上流側弁体１２に代え下流側弁体１３を備える。下流側環状部６の流出側には、端面が斜め上方向に向く傾斜端面が形成されている。下流側環状部６の流出側の上部には、ヒンジ１５が設けられこのヒンジ１５に下流側弁体１３が取り付けられている。下流側弁体１３は、下流側環状部６の流出側の傾斜端面により形成される開口を開閉自在に塞ぐ。   The backflow prevention valve 50 includes a downstream side valve body 13 instead of the upstream side valve body 12 of the backflow prevention valve 2. On the outflow side of the downstream-side annular portion 6, an inclined end surface whose end surface is directed obliquely upward is formed. A hinge 15 is provided at the upper part on the outflow side of the downstream annular portion 6, and the downstream valve body 13 is attached to the hinge 15. The downstream valve body 13 closes the opening formed by the inclined end surface on the outflow side of the downstream annular portion 6 so as to be freely opened and closed.

ここで下流側弁体１３は、下流側環状部６の流出側に形成された開口を塞いだ時に、上流側環状部４の中心と下流側環状部６の中心とを結ぶ線と成す角度θが３０°〜６０°、好ましくは４０°〜５０°、更に好ましくは４５°となるように設置されている。下流側弁体１３は、下流側環状部６の内側から押されると外側に開き、下流側環状部６の外側から押されると傾斜端面により形成される開口を塞ぐ。この場合に下流側弁体１３が上述の角度θとなるように設置されているため、下流側弁体１３の流入側の排水が下流側弁体１３の流入側の面と接触する面積が大きくなり、排水量が少ない場合においても下流側弁体１３が容易に開く。また下流側弁体１３を備えることによりマス２０に複数の流入管接続口が接続されている場合においても、全ての流入管接続口への逆流を防止することができる。   Here, the downstream valve body 13 forms an angle θ formed with a line connecting the center of the upstream annular portion 4 and the center of the downstream annular portion 6 when the opening formed on the outflow side of the downstream annular portion 6 is closed. Is 30 ° to 60 °, preferably 40 ° to 50 °, and more preferably 45 °. The downstream valve body 13 opens outward when pressed from the inside of the downstream annular portion 6, and closes the opening formed by the inclined end surface when pressed from the outside of the downstream annular portion 6. In this case, since the downstream valve body 13 is installed so as to have the above-described angle θ, the area where the drainage on the inflow side of the downstream valve body 13 contacts the inflow side surface of the downstream valve body 13 is large. Thus, even when the amount of drainage is small, the downstream valve body 13 is easily opened. Further, by providing the downstream valve body 13, even when a plurality of inflow pipe connection ports are connected to the mass 20, backflow to all the inflow pipe connection ports can be prevented.

なお下流側弁体１３は、流出側の面に凹部を備えるようにしてもよい。流出側の面に凹部を備える場合には、凹部に逆流した排水が溜まることで下流側弁体１３に荷重がかかり下流側弁体１３の浮き上がりを防止することができる。   In addition, you may make it the downstream valve body 13 equip the outflow side surface with a recessed part. In the case where the outflow side surface is provided with a recess, a load is applied to the downstream valve body 13 due to accumulation of the backflowed drainage in the recess, so that the downstream valve body 13 can be prevented from rising.

図８は他の実施の形態に係る上流側弁体１２の斜視図である。この上流側弁体１２は、凹部１２ｂに把持部１２ｃを備えている。把持部１２ｃを備えることによりマス２０内から上流側弁体１２を開ける際に、把持部１２ｃを掴んで開けることができる。   FIG. 8 is a perspective view of the upstream valve body 12 according to another embodiment. The upstream valve body 12 includes a grip portion 12c in a recess 12b. By providing the grip portion 12c, the grip portion 12c can be grasped and opened when the upstream valve body 12 is opened from the inside of the mass 20.

２，４０，５０…逆流防止弁、４…上流側環状部、４ａ…止水部、４ｂ…傾斜端面、５…スリット、６…下流側環状部、６ａ…止水部、７，１１…把持部、８…インバート部、８ｂ…分割部、１０…ヒンジ、１２…上流側弁体、１２ｂ…凹部、１２ｃ…把持部、１３…下流側弁体、２０…マス
2, 40, 50 ... backflow prevention valve, 4 ... upstream side annular part, 4a ... water stop part, 4b ... inclined surface, 5 ... slit, 6 ... downstream side annular part, 6a ... water stop part, 7, 11 ... gripping , 8 ... Inverted part, 8b ... Dividing part, 10 ... Hinge, 12 ... Upstream valve element, 12b ... Recessed part, 12c ... Gripping part, 13 ... Downstream valve element, 20 ... Mass

Claims (8)

マス内に設置する逆流防止弁であって、
前記マスに排水を流入させる流入管接続口に挿入する上流側環状部と、
前記マスから前記排水を排出させる排出管接続口に挿入する下流側環状部と、
前記上流側環状部と前記下流側環状部を接続するインバート部と、
前記上流側環状部の流出側の端部に設けられ前記上流側環状部の流出側に形成される開口を開閉自在とする上流側弁体または前記下流側環状部の流出側の端部に設けられ前記下流側環状部の流出側に形成される開口を開閉自在とする下流側弁体と、
を有し、
前記下流側環状部の外周面と前記排出管接続口の内周面とが係止することにより保持されることを特徴とする逆流防止弁。 A backflow prevention valve installed in the mass,
An upstream annular portion to be inserted into an inlet pipe connection port for allowing drainage to flow into the mass;
A downstream annular portion inserted into a discharge pipe connection port for discharging the waste water from the mass;
An invert portion connecting the upstream annular portion and the downstream annular portion;
Provided at the end on the outflow side of the upstream side annular part and provided at the end on the outflow side of the upstream side annular part for opening and closing the opening formed on the outflow side of the upstream side annular part. A downstream valve body that freely opens and closes an opening formed on the outflow side of the downstream annular portion,
Have
The backflow prevention valve characterized by hold | maintaining because the outer peripheral surface of the said downstream side annular part and the inner peripheral surface of the said discharge pipe connection port latch. 前記上流側弁体は前記上流側環状部の流出側に形成される開口を塞いだ時に、前記上流側環状部の中心と前記下流側環状部の中心とを結ぶ線と成す角度θが３０°〜６０°となるように設置され、前記下流側弁体は前記下流側環状部の流出側に形成される開口を塞いだ時に、前記上流側環状部の中心と前記下流側環状部の中心とを結ぶ線と成す角度θが３０°〜６０°となるように設置されることを特徴とする請求項１記載の逆流防止弁。   When the upstream valve body closes an opening formed on the outflow side of the upstream annular portion, an angle θ formed with a line connecting the center of the upstream annular portion and the center of the downstream annular portion is 30 °. When the downstream valve body blocks an opening formed on the outflow side of the downstream annular portion, the center of the upstream annular portion and the center of the downstream annular portion are installed so as to be ˜60 °. The backflow prevention valve according to claim 1, wherein the backflow prevention valve is installed so that an angle θ formed with a line connecting the two is 30 ° to 60 °. 前記上流側弁体及び前記下流側弁体は、流出側の面に凹部を備えることを特徴とする請求項１または２記載の逆流防止弁。   3. The backflow prevention valve according to claim 1, wherein the upstream valve body and the downstream valve body have a recess on an outflow side surface. 4. 前記上流側弁体は、前記流出側の面に第１把持部を備えること特徴とする請求項１〜３の何れか一項に記載の逆流防止弁。   The backflow prevention valve according to any one of claims 1 to 3, wherein the upstream valve body includes a first grip portion on the outflow side surface. 前記上流側環状部及び前記下流側環状部の上部に第２把持部を備えること特徴とする請求項１〜４の何れか一項に記載の逆流防止弁。   The backflow prevention valve according to any one of claims 1 to 4, further comprising a second grip portion on top of the upstream annular portion and the downstream annular portion. 前記上流側環状部及び前記下流側環状部の少なくとも一方の底面にスリットが形成されていること特徴とする請求項１〜５の何れか一項に記載の逆流防止弁。   The backflow prevention valve according to any one of claims 1 to 5, wherein a slit is formed on a bottom surface of at least one of the upstream annular portion and the downstream annular portion. 前記インバート部は、前記逆流防止弁を前記上流側環状部側と前記下流側環状部側とに分割する分割部を有することを特徴とする請求項１〜６の何れか一項に記載の逆流防止弁。   The backflow according to any one of claims 1 to 6, wherein the invert part has a split part that divides the backflow prevention valve into the upstream annular part side and the downstream annular part side. Prevention valve. 前記上流側環状部の外周面には止水部が形成されていることを特徴とする請求項１〜７の何れか一項に記載の逆流防止弁。
The backflow prevention valve according to any one of claims 1 to 7, wherein a water stop portion is formed on an outer peripheral surface of the upstream annular portion.
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