Intake valve device

Abstract

To provide a piping system capable of effectively suppressing contamination caused by drain water that splashes differently depending on the pipe shape.SOLUTION: A piping system 1 comprises a vertical pipe 2, a horizontal pipe 3, and an intake valve device 5 for adjusting pressure inside the pipes, wherein the intake valve device 5 is configured to include a first intake valve device 6 installed on the vertical pipe 2 and a second intake valve device 7 installed on the horizontal pipe 3, the first intake valve device 6 comprising a first ventilation member 50 for the vertical pipe, and the second intake valve device 7 comprising a second ventilation member 150 for the horizontal pipe, the second ventilation member 150 having a shape different from that of the first ventilation member 50.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a piping system. [Background technology]

[0002] In the water distribution pipes from the drainage system installed in the living space, the balance of the pressure inside the pipes is lost depending on the flow of the wastewater, resulting in a state of positive or negative pressure. If this causes a seal failure in the trap attached to the drainage system, odors from the sewage will enter the room via the drainage system.

[0003] Therefore, conventionally, devices capable of adjusting the internal pressure of the pipe in relation to the outside air, such as an intake valve or an air vent valve, are installed in the middle of the drainage pipe. For example, the structure of the intake valve is known as disclosed in Patent Document 1. The intake valve device of Patent Document 1 is structured so that when a pressure difference occurs between the outside air pressure and the pressure inside the drainage pipe in the water distribution pipe, the valve body moves to open the intake hole. This intake valve device moves the valve body along a cylindrical guide shaft that extends from the top surface to the base. This structure makes the intake valve device compact. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Application No. 2014-74483 Summary of the Invention [Problem to be solved by the invention]

[0005] The intake valve device of Patent Document 1 is compact, and thus the valve body is close to the drainage surface. Therefore, the splashed wastewater is likely to contaminate the valve body, and an appropriate protective member is required to prevent contamination. The piping from the drainage equipment to the sewer pipe is composed of a combination of a horizontal pipe extending horizontally to the left and right and a vertical pipe extending vertically to the top and bottom, but the conventional intake valve device was the same for the horizontal pipe and the vertical pipe. Here, the inventors found that the horizontal pipe and the vertical pipe flow differently in the way that the wastewater flows inside, and therefore the way that the wastewater splashes in each pipe is different. The inventors have conducted extensive research to be able to take effective measures to prevent contamination according to the shape of the pipe.

[0006] The present invention has been made in consideration of the above problems, and has an object to provide a piping system that can effectively suppress contamination caused by wastewater, which splashes in different ways depending on the shape of the piping. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides a piping system comprising a vertical pipe, a horizontal pipe, and an intake valve device for adjusting the pressure within the pipes, wherein the intake valve device is configured to comprise a first intake valve device installed on the vertical pipe and a second intake valve device installed on the horizontal pipe, the first intake valve device comprising a first ventilation member for the vertical piping, and the second intake valve device comprising a second ventilation member for the horizontal piping having a different shape from the first ventilation member.

[0008] According to the piping system of the present invention, a first intake valve device having a first ventilation member for vertical piping suitable for vertical piping, and a second intake valve device having a second ventilation member for horizontal piping suitable for horizontal piping are provided, and each intake valve device is provided in an appropriate location, so that pollution caused by wastewater, which splashes in different ways depending on the piping shape, can be effectively suppressed.

[0009] In the piping system of the present invention, it is preferable that the first intake valve device includes a valve body and the first vent member installed below the valve body, the second intake valve device includes a valve body and the second vent member installed below the valve body, and the first vent member and the second vent member each include a wall portion extending downward from the lower end of the vent hole. With this configuration, it is possible to efficiently prevent wastewater splashing from below from hitting the wall portion and entering the vent hole.

[0010] In the piping system of the present invention, the wall portion of the second ventilation member preferably has a shorter extension length than the wall portion of the first ventilation member. According to this configuration, by providing a second ventilation member having a wall portion with a short extension length in a horizontal piping having a small inclination angle of splashing with respect to the horizontal direction, it is possible to efficiently block only the wastewater at an angle that reaches the ventilation port without scooping up the splashing of the wastewater that does not reach the ventilation port, thereby suppressing contamination.

[0011] In the piping system of the present invention, it is preferable that the wall portion is formed along the lower edge of the vent hole, and a notch portion is formed at the lower end portion of the wall portion of the first ventilation member. According to this configuration, by providing the first ventilation member having a wall portion with a notch portion formed therein in the vertical piping, which has a large inclination angle of jumping with respect to the horizontal direction and makes it easy for the wastewater to reach the vent hole, the wastewater that reaches the vent hole can be efficiently dropped from the notch portion. Effect of the Invention

[0012] As described above, the piping system according to the present invention can effectively suppress contamination caused by wastewater that splashes in different ways depending on the shape of the piping. [Brief description of the drawings]

[0013] [Figure 1] 1 is a diagram illustrating a piping system according to an embodiment of the present invention. [Diagram 2] 2 is a bottom perspective view showing the external appearance of the first intake valve device. FIG. [Diagram 3] FIG. 3 is an exploded perspective view of the first intake valve device corresponding to FIG. 2. [Figure 4] 5A to 5C are diagrams showing a protective member for a first intake valve device, in which (a) is a top view, (b) is a side view, and (c) is a bottom view. [Diagram 5] 4 is a top perspective view showing a protective member of the first intake valve device. FIG. [Figure 6] 4 is a bottom perspective view showing the external appearance of the second intake valve device. FIG. [Figure 7] 5A to 5C are views showing a protective member of a second ventilation member, in which (a) is a top view, (b) is a side view, and (c) is a bottom view. [Figure 8] 11 is a perspective view showing a protective member of a second ventilation member as viewed from above. FIG. [Figure 9] 5A to 5C are conceptual diagrams for explaining the effects of the first intake valve device. [Figure 10] 5 is a conceptual diagram for explaining the function and effect of the second intake valve device. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, the embodiment of the present invention will be described with reference to the drawings. Note that the embodiment shown below is intended to provide a better understanding of the gist of the invention, and does not limit the present invention unless otherwise specified. Also, each drawing is shown to make the features of the present invention easier to understand, and the dimensional ratios of each component are not necessarily the same as those in reality.

[0015] Under the floor of the living space 100 in the house shown in Figure 1, a drainage pipe 106 is formed through which wastewater discharged from drainage equipment 101 such as a sink, washing machine, toilet, and bathtub is guided to a sewer pipe (not shown). Here, the drainage pipeline 106 is configured to include a horizontal drainage pipeline 104 and a vertical drainage pipeline 105. The horizontal drainage pipeline 104 and the vertical drainage pipeline 105 are formed by connecting a plurality of pipes 102 and a plurality of joints 103. Each drainage equipment 101 is connected to a joint 103 via a drainage pipe 107 at a predetermined position, and the drainage from each drainage equipment 101 is guided in a predetermined direction (toward the sewer piping) by the drainage pipe 107 and the joint 103. In this way, a drainage pipeline 106 is formed within the building.

[0016] (Piping system configuration) The piping system 1 of this embodiment includes a vertical pipe 2, a horizontal pipe 3, and an intake valve device 5 that adjusts the pressure within these pipes. The vertical pipe 2 is a pipe that extends vertically in the drainage pipeline 106, and is composed of a vertical drainage pipeline 105. The horizontal pipe 3 is a pipe that extends horizontally in the drainage pipeline 106, and is composed of a horizontal drainage pipeline 104.

[0017] The intake valve devices 5 are provided at multiple locations along the drain pipe 106 to eliminate pressure drops (negative pressure). When a pressure drop occurs, the intake valve devices 5 open to take in outside air. The intake valve devices 5 are configured to include a first intake valve device 6 installed in the vertical pipe 2 and a second intake valve device 7 installed in the horizontal pipe 3. The first intake valve device 6 includes a first ventilation member 50 for the vertical pipe. The second intake valve device 7 includes a second ventilation member 150 for the horizontal pipe, which has a different shape from the first ventilation portion 50.

[0018] The first intake valve device 6 is provided at the upper end of the vertical pipe 2. Specifically, the first intake valve device 6 is installed above a joint 103 that connects the vertical pipe 2 and the horizontal pipe 3, and opens when a pressure drop occurs at the downstream end of the horizontal pipe 3 or the upstream end of the vertical pipe 2.

[0019] The second intake valve device 7 is installed, for example, in an upper branch section 103A (see Figure 9) provided above the joint 103, upstream of the horizontal piping 3, and opens when a pressure drop occurs in the horizontal piping 3 near the joint 103.

[0020] As described above, the intake valve device 5 is installed at a location in the drain pipe 106 where a pressure drop occurs or is likely to occur.

[0021] (Configuration of first intake valve device) As shown in FIGS. 2 and 3, the first intake valve device 6 is configured to include an intake valve main body 10, a cover body 40, and a first ventilation member 50.

[0022] The cover body (so-called lid body) 40 covers the upper part of the intake valve main body 10 and is installed in a state that allows ventilation through the intake valve main body 10. The cover body 40 is composed of a cover body main body 41, an engaged protruding portion 42 extending downward from the cover body main body 41, and an operating projection 43 extending upward from the cover body main body 41.

[0023] The cover body main body 41 is a disk-shaped member made of synthetic resin or the like, and covers the upper surface of the intake valve main body portion 10 . A circular mark opening 44 is formed in a part of the cover body main body 41 .

[0024] The mark opening 44 provides a visual indication of the completion of installation of the first intake valve device 6. Specifically, the color of the mark opening 44 changes before and after the installation of the first intake valve device 6. Before a specified operation, the marker opening 44 allows a view of the upper surface of the second tube body 18, and after the specified operation, the top surface of a marker protrusion (not shown) provided on the upper surface of the second tube body 18, which will be described later, can be seen from the marker opening 44. Therefore, for example, if the color of the second tube body 18 is gray, the inside of the marker opening 44 will be gray when installation is incomplete, and if the top surface of the marker protrusion (not shown) is red, the inside of the marker opening 44 will turn red when installation is complete. That is, by rotating the operation protrusion 43, the color inside the mark opening 44 is switched between a state in which the top surface of the mark protrusion (not shown) is visible and a state in which it is not visible. Therefore, by noticing the change in color inside the mark opening 44, the worker can visually confirm that the installation of the first intake valve device 6 has been completed.

[0025] The engaged protrusion 42 is provided to engage the cover body 40 with the intake valve main body 10 and to separate the cover body 40 and the intake valve main body 10 from each other. Specifically, it is a roughly rectangular piece-like member having a shape that allows the engagement piece portion 13 of the intake valve main body 10 , which will be described later, to be attached to the inside of the engaged protrusion portion 42 . The engaged protruding portion 42 protrudes downward from the lower surface of the cover body main body 41 . By attaching the engaged protrusion 42 to the engaging piece portion 13, the cover body 40 and the intake valve main body 10 can be fixed together while providing a space between the cover body 40 and the intake valve main body 10 through which the outside air can communicate. In this embodiment, three engaged protrusions 42 are provided on the cover body 41, but the number and positions thereof may be changed as appropriate.

[0026] The operating protrusion 43 is intended to facilitate the operation of attaching the first intake valve device 6 to the upper branch portion 103A. The operation protrusion 43 is provided so as to protrude upward from a part of the cover body main body 41 . As a specific operation, when attaching the first intake valve device 6 to the upper branch portion 103A, first place the first intake valve device 6 in the upper branch portion 103A, then, while lightly pressing the first intake valve device 6 from above, place an attachment tool across any two of the operation projections 43, and rotate the attachment tool. This causes the cover body 40 and the first cylindrical member 11 described later to rotate integrally. As a result, a part of the fixed packing 16 of the intake valve main body 10 described later tries to deform in the radially expanding direction, but since it cannot be expanded beyond the inner diameter of the upper branch portion 103A, the fixed packing 16 is pressed against the inner wall of the upper branch portion 103A, and assumes a position with improved watertightness, making it impossible to easily remove the first intake valve device 6 (fixed state). In this embodiment, four operation protrusions 43 are provided on the cover body main body 41, but the number and positions thereof may be changed as appropriate within the range in which operation with a tool is possible.

[0027] The intake valve main body 10 is a member that serves as a housing for a valve body 24 described later, and draws in outside air and ventilates the air into the drain pipe 106. The intake valve body 10 is made of synthetic resin and has a generally cylindrical shape. The intake valve main body 10 is composed of a first cylindrical member 11, a sliding piece 15, a fixed gasket 16, a second cylindrical member 17, a seal washer 21, a seal gasket 22, a valve body 24, a spring member 27, and a guide shaft 51 of the first ventilation member 50.

[0028] The first cylindrical member 11 constitutes the upper part of the intake valve main body 10. The first cylindrical member 11 is a member for fixing the cover body 40 relative to the intake valve main body 10. The first cylindrical member 11 is formed from a substantially cylindrical first cylindrical body 12 inside which a portion of the second cylindrical member 17 can be placed, and an engagement piece portion 13 extending upward from the cylindrical body 12.

[0029] The inner diameter of the first cylindrical body 12 is slightly larger than a portion of the outer diameter of the second cylindrical member 17, and a convex portion (not shown) is formed on the inner surface of the first cylindrical body 12 so as to fit into a groove 20 of the second cylindrical body 18 described later. With the convex portion (not shown) fitted into the groove 20 of the second cylindrical body 18, the first cylindrical body 12 is rotated in a predetermined direction, whereby the first cylindrical body 12 moves relatively downward. As a result, the bottom surface of the first cylindrical body 12 presses the fixed packing 16, causing the fixed packing 16 to deform. Therefore, the first cylindrical body 12 can press the fixed packing 16 and release the pressed state in response to the rotational operation of the operating protrusion 43 provided on the cover body 40.

[0030] The engaging piece 13 is a member for engaging with the engaged protruding portion 42 of the cover body 40, and when engaged with the engaged protruding portion 42, the engaging piece 13 enables ventilation through the intake valve main body 10. A protrusion 14 extending radially outward is formed on the outer periphery of the engaging piece portion 13. This protrusion 14 corresponds to a recess (not shown) provided on the inside of the engaged protruding portion 42, and engages with the cover body 40 by the engagement between this protrusion 14 and the recess (not shown).

[0031] The sliding piece 15 facilitates the rotational operation of the first cylindrical member 11 and ensures that the first intake valve device 6 is fixed. The sliding piece 15 is provided between the bottom surface of the first cylindrical member 11 and the fixed packing 16 . The sliding piece 15 facilitates the rotation operation when the first cylindrical member 11 is rotated relative to the second cylindrical member 17, and also enables the fixed packing 16 to be deformed reliably. The choice of whether or not to use the sliding piece 15 is within the scope of design changes.

[0032] The fixed packing 16 is for fixing the first intake valve device 6 in a watertight state within the upper branch portion 103A, and is made of an elastically deformable resin or the like. The fixed packing 16 is a substantially cylindrical member, and is installed on the outer circumferential surface of the second cylindrical member 17. The upper end of the fixed packing 16 in this state is disposed on the bottom surface of the first cylindrical member 11. With this configuration, when the first cylindrical member 11 moves relatively downward due to the rotation of the cover body 40, the fixed packing 16 is pressed from above and below and deformed so as to protrude radially outward. This deformation of the fixed packing 16 enables the upper branch portion 103A and the first intake valve device 6 to be fixed watertightly.

[0033] The second cylindrical member 17 constitutes the lower part of the intake valve main body 10, and a valve body 24 can be slidably installed inside the second cylindrical member 17. The second cylinder member 17 has a substantially cylindrical second cylinder body 18, an air intake hole 19, and an engaging portion (not shown).

[0034] The second cylindrical body 18 has a groove 20 on its outer peripheral surface to enable rotation of the first cylindrical member 11 with the protrusion of the first cylindrical member 11 arranged therein during the installation operation of the first cylindrical member 11, and also has an air intake hole 19 on the upper surface.

[0035] The groove 20 is formed in a so-called spiral shape, in which the coordinates of the horizontal plane move continuously when moving from above to below. With this configuration, by rotating the first cylindrical member 11 relative to the second cylindrical member 17 in a predetermined direction, the height of the first cylindrical member 11 can be moved in either the up or down direction.

[0036] The air intake hole 19 communicates with the outside air space and draws in outside air when it is open. Normally, a seal portion 23 and a valve body 24, which will be described later, are in close contact with the lower end of the intake hole 19, blocking the outside air space from the drain pipe 106. When negative pressure occurs in the drain pipe 106, the valve body 24 descends, opening the intake hole 19 and allowing outside air to flow into the drain pipe 106.

[0037] The engaging portion (not shown) may be one that can engage with an engaged portion 54 of the first ventilation member 50 (described later) and has a male-female relationship. Specifically, it is sufficient if it is either an engaging claw or an opening for hooking the engaging claw, and in this embodiment, three openings (not shown) are provided. The engaging claw of the engaged portion 54 hooks onto this engaging portion, thereby making it possible to integrate the intake valve main body 10 and the first vent member 50.

[0038] The seal washer 21 is intended to improve the adhesion of the seal packing 22 . In this embodiment, the seal washer 21 is made of a synthetic resin or the like. The seal washer 21, together with the seal packing 22, is engaged by a seal engaging portion 26 on the valve body 24, thereby improving the adhesion of the seal packing 22.

[0039] The seal packing 22 is seated on the second cylindrical member 17 to close the intake hole 19 . The seal packing 22 is a ring-like member having an outer diameter larger than that of the seal washer 21, and a groove in which the seal washer 21 can be disposed is provided on the inside of the seal packing 22.

[0040] The seal portion 23 enables the intake hole 19 to be closed / opened in accordance with the sliding movement of the valve body 24 . The seal portion 23 is composed of the above-mentioned seal washer 21 and seal packing 22. The seal portion 23 is pressed against the valve body 24 in a state where it is engaged with the top surface of the valve body 24 by a seal engaging portion 26 on the top surface of the valve body 24, which will be described later.

[0041] The valve body 24 is made of synthetic resin or the like and has an outer shape formed like a cylinder with a closed top. Since the outer diameter of the valve body 24 is smaller than the inner diameter of the second cylindrical body 18, the valve body 24 moves up and down within the second cylindrical body 18. The valve body 24 slides to close / open the intake hole 19 of the second cylindrical member 17 by utilizing the elastic force of the spring member 27 for biasing, and in this embodiment, the sliding direction of the valve body 24 is set parallel to the extension direction of the guide shaft 51 described later. The valve body 24 includes a spring holding portion 25 and a seal engaging portion 26 .

[0042] The biasing means for the valve body 24 can be changed as appropriate to any mechanism that utilizes the elastic force of a spring or the like, such as magnetic force, air pressure, hydraulic pressure, etc., as long as it maintains the position of the intake hole 19 in a closed state under normal circumstances. In addition, the valve body 24 in this embodiment is molded into a cylindrical hollow shape so that it is easy to float when the water-passing side of the pipe is full, but the shape of the valve body 24 is not limited to this and may be changed as appropriate to various shapes such as a disk, a part of a sphere, a cone, or a pyramid.

[0043] The spring retaining portion 25 extends from a part of the valve body 24 upward beyond the top surface of the valve body 24, and is formed in a generally cylindrical shape with a closed upper end and an open inner side. Inside the spring holding portion 25, the spring member 27 and a guide shaft 51, which will be described later, are arranged in a predetermined state when the spring member 27 is in either an expanded or compressed state.

[0044] The spring member 27 is a biasing means that is disposed inside the valve body 24 and maintains the position of the valve body 24 so that the valve body 24 is in a closing state relative to the intake hole 19 under normal circumstances. The spring member 27 is disposed between the spring holding portion 25 and the guide shaft 51 .

[0045] The first ventilation member 50 has a generally disk-like shape. When attached to the lower part of the intake valve body 10 , the first ventilation member 50 prevents drainage water splashing in the drain pipe 106 from entering the ventilation hole of the intake valve body 10 . The first ventilation member 50 is composed of a guide shaft 51, a partition portion 52, a wall portion 53, an engaged portion 54, a ventilation hole 55, and an outer circumferential portion 56.

[0046] The guide shaft 51 allows the valve body 24 to slide along the guide shaft 51 . The guide shaft 51 is a cylindrical member that extends upward from a part of the partition portion 52 . Guide shaft 51 is formed in the center of partition portion 52, and spring member 27 is attached to its upper end. Specifically, guide shaft 51 is provided with a reduced diameter convex portion 51A for holding spring member 27 at its upper end, and spring member 27 is held by fitting the inner periphery of spring member 27 into the outer periphery of reduced diameter convex portion 51A.

[0047] The partition portion 52 separates the first intake valve device 6 between the intake valve main body 10 side and the water passage side. The partition portion 52 allows the intake of outside air when the intake valve is open, while physically preventing the infiltration of wastewater splashed from the water passage side to the intake valve main body portion 10 side.

[0048] In this embodiment, the partition 52 is composed of a disk-like partition plate 52A disposed inside the outer periphery 56, and a crosspiece 52B extending from a part of the partition plate 52A toward the center, and a vent hole 55 for intake air is formed in a part of the crosspiece 52B. The partition plate 52A protrudes downward from the outer periphery, and a step 57 is formed at the boundary between the outer periphery 56 and the partition plate 52A. The vent hole 55 is formed in the central part of the partition plate 52A, excluding the crosspiece 52B.

[0049] The wall portion 53 is intended to block the progress of wastewater that splashes from the water passing side before it reaches the partition portion 52. The wall portion 53 is provided extending downward from the lower end of the ventilation hole 55. Specifically, the wall portion 53 is provided extending from a part of the partition plate 52A of the partition portion 52 toward the water passage side. The downward extension length of the wall portion 53 of the first ventilation member 50 is longer than the downward extension length of the wall portion 153 of the second ventilation member 150 described later. The wall portion 53 is formed along the peripheral portion of the ventilation hole 55 and has an arc shape concentric with the ventilation hole 55. Three wall portions 53 are provided so as to surround the peripheral portion of the ventilation hole 55. A notch portion 53A is formed between each wall portion 53, 53, and adjacent wall portions 53, 53 are spaced apart. The notch portion 53A is for facilitating dripping of wastewater, and in this embodiment, is formed over the entire length from the lower end to the upper end of the wall portion 53. It should be noted that the cutout portion 53A only needs to be formed at the lower end portion of the wall portion 53, and the upper portions of adjacent wall portions 53, 53 may be connected to each other.

[0050] Since the wall portion 53 is provided inside the outer circumferential portion 56, the outer circumferential surface of the wall portion 53 and the inner circumferential surface of the drain pipe 106 are separated by a predetermined distance, with a space being provided therebetween. A part of the splashed wastewater collides with the wall portion 53, and then drips down along the outer and inner peripheral surfaces thereof.

[0051] The engaged portion 54 is for engaging the first ventilation member 50 with the intake valve body 10 . The engaged portion 54 in this embodiment is a portion that engages with an engaging portion (claw) (not shown), and has a shape that allows the engaging portion to engage. The engaged portion 54 is formed at three locations at equal intervals along the outer circumferential portion 56. By engaging the engaged portion 54 with an engaging portion (not shown), the intake valve main body 10 and the first ventilation member 50 can be integrated.

[0052] (Configuration of second intake valve device) The second intake valve device 7 will be described with reference to Figures 6 to 8. As shown in Figure 6, the second intake valve device 7 is configured to include an intake valve main body 10, a cover body 40, and a second ventilation member 150, with the configuration of the second ventilation member 150 differing from that of the first intake valve device 6. The intake valve main body 10 and the cover body 40 other than the second ventilation member 150 are the same as those of the first intake valve device 6, so the same reference numerals are used and description will be omitted.

[0053] 7 and 8, the second ventilation member 150 is composed of a guide shaft 51, a partition portion 152, a wall portion 153, an engaged portion 54, a ventilation hole 55, and an outer peripheral portion 56. The second ventilation member 150 differs from the first ventilation member 50 in the configurations of the partition portion 152 and the wall portion 153. The guide shaft 51, the engaged portion 54, the ventilation hole 55, and the outer peripheral portion 56 other than the partition portion 152 and the wall portion 153 are the same as those of the first ventilation member 50, so they are denoted by the same reference numerals and description thereof will be omitted. The fixing structure of the second ventilation member 150 to the piping (horizontal piping 3) and the fixing structure of the first ventilation member 50 to the piping (vertical piping 2) have the same configuration. Specifically, this is a known configuration, such as engaging a claw portion formed on the ventilation member 50, 150 with a step portion of the piping, screwing a male thread portion formed on the ventilation member 50, 150 into a female thread portion of the piping, or fitting the ventilation member 50, 150 into the opening of the piping.

[0054] The partition section 152 of the second ventilation member 150 is composed of a disk-like partition plate 152A arranged inside the outer periphery 56, and a crosspiece 52B extending from a part of the partition plate 152A toward the center, and a ventilation hole 55 for intake air is formed in a part of the crosspiece 52B. There is no step between the partition plate 152A and the outer periphery 56, and the crosspiece 52B is flush with the bottom surface of the outer periphery 56. The other crosspieces 52B and the ventilation hole 55 are the same as those of the first ventilation member 50.

[0055] The wall portion 153 is provided extending downward from the lower end of the ventilation hole 55. The downward extension length of the wall portion 153 of the second ventilation member 150 is shorter than the downward extension length of the wall portion 53 of the first ventilation member 50. The wall portion 153 is formed along the peripheral edge of the ventilation hole 55. The wall portion 153 has no notch and has a cylindrical shape that is connected all around. The cylindrical shape of the wall portion 153 is concentric with the ventilation hole 55.

[0056] Since the wall portion 153 is provided inside the outer circumferential portion 56, the outer circumferential surface of the wall portion 153 and the inner circumferential surface of the upper branch portion 103A are spaced apart by a predetermined distance, providing a space therebetween. After colliding with the wall portion 153, a part of the splashed wastewater drips down along the outer circumferential surface and the inner circumferential surface.

[0057] The following describes the effects of the piping system 1 according to this embodiment. First, the function and effect of the first intake valve device 6 equipped with the first ventilation member 50 will be described with reference to FIG. As shown in FIG. 9, the wastewater that flows from the horizontal pipe 3 toward the vertical pipe 2 falls downward through the joint 103, but the wastewater that has risen in the horizontal pipe 3 flows into the joint 103 with the same momentum, colliding with the inner wall of the joint 103, which makes it easy for the wastewater to splash. For example, the splashed wastewater W1 shown by W1 to W3 in FIG. 9 collides with the outer peripheral surface of the wall portion 53. In addition, the splashed wastewater W2 and the splashed wastewater W3 collide with the partition plate 52A (see FIG. 2) and the crosspiece 52B (see FIG. 2) of the partition portion 52. As described above, most of the splashed wastewater W1 to W3 are stopped by the first ventilation member 50, so that the infiltration of the wastewater into the intake valve main body 10 inside the ventilation port 55 can be suppressed. The wastewater that collides with first ventilation member 50 reaches wall portion 53 along partition plate 52A and crosspiece 52B, flows down along wall portion 53, and falls from the lower end of wall portion 53. At this time, since notch portion 53A is formed at the lower end portion of wall portion 53, the wastewater gathers at the corner portion of wall portion 53 and is likely to fall.

[0058] In addition, since the angle of the splashing wastewater W1 with respect to the water surface (hereinafter referred to as the "splash angle") is large at the upper end of the vertical pipe 2, the wall portion 53 is extended relatively long downward to block a large amount of the wastewater W1. The wastewater that passes under the wall portion 53 has a smaller splash angle than the blocked wastewater W1, and is therefore less likely to reach the vent hole 55. Furthermore, since the first intake valve device 6 is provided with a step portion 57 on the lower surface, the lower end position of the wall portion 53 can be further lowered, and more wastewater W1 can be blocked. In addition, the step portion 57 makes it easier for the wastewater that reaches the outer circumferential portion 56 to fall.

[0059] As described above, the first ventilation member 50 for the vertical piping 2 can effectively block the wastewater W1 to W3 splashed toward the ventilation port 55. In other words, the first intake valve device 6 including the first ventilation member 50 can achieve an advantageous effect specialized for the vertical piping 2.

[0060] Next, the function and effect of the second intake valve device 7 equipped with the second ventilation member 150 will be described with reference to FIG. As shown in FIG. 10, the wastewater W11 that splashes in the horizontal pipe 3 splashes from the surface of the wastewater flowing downstream toward the diagonally upward downstream side. The splashed wastewater W1 collides with the outer peripheral surface of the wall portion 153, thereby preventing it from reaching the inner vent 55. In the horizontal pipe 3, the splash angle of the splashing wastewater W11 is small, so there is little wastewater that splashes directly toward the vent 55. Therefore, the second ventilation member 150 for the horizontal pipe 3 has a shorter downward extension length of the wall portion 153 than the wall portion 53 of the first ventilation member 50. This prevents the scooping up of the wastewater W12, which has an even smaller splash angle, while efficiently suppressing the splashing of the wastewater W11 toward the vent 55. In addition, the wall portion 153 does not have a notch and is formed to be connected all around, thereby preventing the infiltration of the wastewater W11 from the lateral direction.

[0061] As described above, the second intake valve device 7 for the horizontal piping 3 can efficiently block the drainage water W11 that splashes toward the second ventilation member 150. In other words, the second intake valve device 7 including the second ventilation member 150 can achieve an advantageous effect specific to the horizontal piping 3.

[0062] As described above, the present invention focuses on the fact that in the vertical piping 2, wastewater that splashes relatively upwards tends to reach the first ventilation member 50, whereas in the horizontal piping 3, wastewater that splashes sideways tends to reach the second ventilation member 150. According to the piping system 1 of this embodiment, the first intake valve device 6 equipped with the first ventilation member 50 suitable for the vertical piping 2 and the second intake valve device 7 equipped with the second ventilation member 150 suitable for the horizontal piping 3 are provided in appropriate positions, so that contamination by wastewater that splashes in different ways depending on the piping shape can be effectively prevented.

[0063] In addition, since the first ventilation member 50 has a wall portion 53 and the second ventilation member 150 has a wall portion 153, wastewater splashing from below hits the walls 53, 153 and can be efficiently prevented from entering the ventilation hole 55.

[0064] In this embodiment, the wall portion 153 of the second ventilation member 150 has a shorter extension length than the wall portion 53 of the first ventilation member 50. Therefore, by providing the second ventilation member 150 with a wall portion having a short extension length on the horizontal piping 3 which has a small inclination angle of splashing with respect to the horizontal direction, it is possible to efficiently receive only the wastewater at an angle that reaches the ventilation hole, without receiving the splashing of the wastewater that does not reach the ventilation hole, thereby preventing contamination.

[0065] In this embodiment, the wall portion 53 of the first ventilation member 50 is formed along the lower edge of the ventilation hole 55, and a notch portion 53A is formed at the lower end portion of the wall portion 53. Therefore, by providing the first ventilation member 150 in the vertical piping 2 which has a large inclination angle of splash with respect to the horizontal direction and which makes it easy for wastewater to reach the ventilation hole 55, the wastewater that reaches the ventilation hole 55 can be efficiently dropped through the notch portion 53A.

[0066] In this embodiment, the fixing structure of the first ventilation member 50 to the piping and the fixing structure of the second ventilation member 150 to the piping have the same configuration. Therefore, even if the first ventilation member 50 and the second ventilation member 150 are changed, for example, when the piping configuration is changed at the construction site, the change can be accommodated and installation can be easily performed.

[0067] On the other hand, when negative pressure occurs in the drain vertical pipe 105, the pressure near the valve body 24 in the intake valve main body 10 decreases through the vent hole 55 of the first vent member 50 of the first intake valve device 6 and the vent hole 55 of the second vent member 150 of the second intake valve device 7. In the piping system 1, as the pressure in the drain pipe 106 decreases, the valve body 24 descends and the intake hole 19 opens. Outside air enters the drain pipe 106 through the open intake hole 19, and the pressure difference is eliminated. This makes it possible to prevent the water in the S-trap of the drain pipe from being drawn away. After the pressure difference is eliminated, the valve body 24 rises and the intake hole 19 is closed, returning to the normal state.

[0068] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and can be modified as appropriate without departing from the spirit of the present invention. For example, in the above embodiment, the wall portion 53 is provided with the notch portion 53A to facilitate the drainage water to fall, but the present invention is not limited to this. The wall portion may be formed into a cylindrical shape and a protrusion protruding downward may be provided at the lower end of the cylinder. With such a configuration, the drainage water that flows into the wall portion is collected on the protrusion and easily falls. [Explanation of symbols]

[0069] 1 Piping System 2 Vertical piping 3 Horizontal piping 5. Intake valve device 6. First intake valve device 7. Second intake valve device 50 First ventilation member 53 Wall 53A Notch 54 Engaged part 55 Vent 150 Second ventilation member 153 Wall

Claims

1. A piping system including a vertical pipe, a horizontal pipe, and an intake valve device for adjusting pressure in the pipes, the intake valve device includes a first intake valve device installed in the vertical piping and a second intake valve device installed in the horizontal piping, The first intake valve device includes a first ventilation member for a vertical pipe, The second intake valve device includes a second ventilation member for a horizontal pipe having a different shape from the first ventilation member. A piping system comprising:

2. the first intake valve device includes a valve body and the first ventilation member disposed below the valve body, the second intake valve device includes a valve body and the second ventilation member disposed below the valve body, The first ventilation member and the second ventilation member each include a wall portion extending downward from a lower end of the ventilation port. The piping system according to claim 1 .

3. The wall portion of the second ventilation member has an extending length shorter than that of the wall portion of the first ventilation member. The piping system according to claim 2 .

4. The wall portion is formed along a lower edge of the ventilation opening, A notch is formed in a lower end of the wall of the first ventilation member.

4. The piping system according to claim 2 or 3.

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