JP6752411B2 - Piping structure - Google Patents

Description

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.

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").

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.

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.

Japanese Unexamined Patent Publication No. 2008-169575

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.

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").

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.

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 .

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.

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.

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.

It is sectional drawing which shows the 1st Example. It is a side view which shows the construction state of 1st Example. FIG. 2 is a sectional view taken along the line AA of FIG. It is a reference figure which shows the state which took out the check flow prevention valve unit from the structure of FIG. It is a bottom view which shows the state which the closed part of a check valve is closed. FIG. 5 is a cross-sectional view taken along the line BB of FIG. FIG. 5 is a sectional view taken along the line CC of FIG. It is a perspective view from the lower side of the check valve in the state of FIG. It is a bottom view which shows the state which the closed part of the check valve is open. It is a perspective view from the lower side of the check valve in the state of FIG. It is sectional drawing which shows the closed state of the intake valve. It is sectional drawing which shows the opening state of an intake valve. It is sectional drawing which shows the conventional example. 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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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 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 (3)

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 . 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. 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.

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