Ventilation component

Abstract

This piping system effectively controls pollution caused by wastewater that splashes in different ways depending on the pipe shape. [Solution] An intake valve device installed in a drainage pipe comprises an intake valve body, a cover body covering the upper part of the intake valve body, a ventilation member attached below the intake valve body, and a ventilation opening provided in the ventilation member, wherein the ventilation member comprises a partition portion that prevents drainage from the water passage side to the intake valve body side, and a wall portion that obstructs the progress of drainage from the water passage side before it reaches the partition portion, wherein the wall portion is integrally provided so as to extend from a part of the partition portion to the water passage side and is curved in an arc shape.

Description

Technical Field

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

Background Art

[0002] Inside the water discharge pipe from the drainage facilities installed in the living space, the balance of the internal pressure of the pipe is disrupted according to the flow of the drainage, and it becomes a positive pressure or negative pressure state. Due to this, if the water seal of the trap attached to the drainage facilities is broken, the odor from the sewage will penetrate into the room via the drainage facilities.

[0003] Therefore, conventionally, a device that can adjust the internal pressure in the pipeline, such as an intake valve or a ventilation valve, is installed in the middle of the drainage pipe. As the structure of the intake valve, for example, the one disclosed in Patent Document 1 is known. The intake valve device of Patent Document 1 has a structure in which when a pressure difference occurs between the external atmospheric pressure and the internal pressure in the drainage pipeline in the water discharge pipeline, the valve body moves to open the intake hole. This intake valve device moves the valve body along a cylindrical guide shaft from the top surface to the base. With such a structure, the intake valve device is made compact.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The intake valve device described in Patent Document 1, due to its compact size, has a structure in which the valve body is closer to the drain surface. Therefore, splashing wastewater is more likely to contaminate the valve body, requiring appropriate protective components to prevent contamination. Incidentally, the piping from the drainage facility to the sewer pipe is composed of a combination of horizontal piping extending in the left-right direction and vertical piping extending in the up-down direction, but conventional intake valve devices were installed in both the horizontal and vertical piping. Here, the inventors have found that the way wastewater flows through the horizontal and vertical piping is different, and therefore the way wastewater splashes within each pipe is also different. The inventors then diligently studied how to implement effective contamination prevention measures according to the shape of the piping.

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

[0007] To solve the aforementioned problems, the present invention provides a piping system comprising vertical piping, horizontal piping, and an intake valve device for adjusting the pressure inside the piping, wherein the intake valve device comprises 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 comprising a first ventilation member for vertical piping, and the second intake valve device comprising a second ventilation member for 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 equipped with a first ventilation member for vertical piping suitable for vertical piping and a second intake valve device equipped with a second ventilation member for horizontal piping suitable for horizontal piping are provided, and each intake valve device is installed in an appropriate location, so that contamination 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, the first intake valve device comprises a valve body and the first ventilation member installed below the valve body, and the second intake valve device comprises a valve body and the second ventilation member installed below the valve body, and it is preferable that the first ventilation member and the second ventilation member each have a wall portion extending downward from the lower end of the ventilation opening. With such a configuration, it is possible to effectively suppress the intrusion of splashing wastewater into the ventilation opening when it hits the wall portion from below.

[0010] In the piping system of the present invention, it is preferable that the wall portion of the second ventilation member has a shorter extension length compared to the wall portion of the first ventilation member. With this configuration, by providing a second ventilation member with a wall portion of a shorter extension length in a horizontal pipe where the angle of inclination of splashes in the horizontal direction is small, it is possible to efficiently block only the drainage that reaches the vent at an angle that does not reach the vent without scooping up the splashes of drainage that do not reach the vent, thereby suppressing contamination.

[0011] In the piping system of the present invention, the wall portion is formed along the lower edge of the vent opening, and it is preferable that a notch is formed at the lower end of the wall portion of the first ventilation member. With such a configuration, by providing a first ventilation member with a wall portion having a notch in it in a vertical pipe where the angle of inclination of splashing with respect to the horizontal direction is large and drainage can easily reach the vent opening, the drainage that reaches the vent opening can be efficiently dropped through the notch. [Effects of the Invention]

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

[0013] [Figure 1] This is a schematic diagram showing a piping system according to an embodiment of the present invention. [Figure 2] This is a perspective view from the bottom, showing the external appearance of the first intake valve device. [Figure 3] This is an exploded perspective view of the first intake valve device corresponding to Figure 2. [Figure 4] This is a drawing showing the protective member of the first intake valve device, where (a) is a top view, (b) is a side view, and (c) is a bottom view. [Figure 5] This is a top-view perspective showing the protective member of the first intake valve device. [Figure 6] This is a perspective view from the bottom, showing the external appearance of the second intake valve device. [Figure 7] This drawing shows the protective member of the second ventilation member, where (a) is a top view, (b) is a side view, and (c) is a bottom view. [Figure 8] This is a top-view perspective showing the protective member of the second ventilation member. [Figure 9] This is a conceptual diagram illustrating the operation and effect of the first intake valve system. [Figure 10] This is a conceptual diagram illustrating the operation and effect of the second intake valve device. [Modes for carrying out the invention]

[0014] The embodiments for carrying out the present invention will be described below with reference to the drawings. The embodiments shown below are intended to provide a better understanding of the spirit of the invention and do not limit the present invention unless otherwise specified. Furthermore, the drawings are provided to make the features of the present invention easier to understand, and the dimensional ratios of each component may not be identical to those of the actual components.

[0015] In the living space 100 of the house shown in Figure 1, a drainage pipeline 106 is formed beneath the floor, through which wastewater discharged from drainage facilities 101 such as washbasins, washing machines, toilets, and bathtubs is guided to a sewer pipe (not shown). Here, the drainage pipeline 106 is comprised of 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 multiple pipes 102 and multiple fittings 103. Each drainage facility 101 is connected to a joint 103 via a drainage pipe 107 at a predetermined position, and the drainage from each drainage facility 101 is guided in a predetermined direction (towards the sewage pipe side) by the drainage pipe 107 and the joint 103. In this way, a drainage pipeline 106 is formed within the building.

[0016] (Configuration of the piping system) The piping system 1 of the present embodiment includes a vertical pipe 2, a horizontal pipe 3, and an intake valve device 5 for adjusting the pressure within these pipes. The vertical pipe 2 is a pipe that extends in the vertical direction within the drainage pipeline 106 and is constituted by a vertical drainage pipeline 105. The horizontal pipe 3 is a pipe that extends in the horizontal direction within the drainage pipeline 106 and is constituted by a horizontal drainage pipeline 104.

[0017] The intake valve device 5 is for eliminating the pressure drop (negative pressure) that occurs within the drainage pipeline 106 and is provided at multiple locations along the middle of the drainage pipeline 106. The intake valve device 5 opens to take in outside air when a pressure drop occurs. The intake valve device 5 is configured to have 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 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 part 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 the joint 103 that connects the vertical pipe 2 and the horizontal pipe 3, and it opens when a pressure drop occurs at the downstream end of the horizontal pipe 3 or the upstream end of the vertical pipe 2. <​​​​​​As described above, the intake valve device 5 is installed in locations within the drainage pipeline 106 where a pressure drop occurs or is likely to occur.

[0021] (Configuration of the first intake valve system) As shown in Figures 2 and 3, the first intake valve device 6 is comprised of an intake valve body 10, a cover body 40, and a first ventilation member 50.

[0022] The cover body (so-called lid) 40 covers the upper part of the intake valve body 10 and is installed in a manner that allows ventilation by the intake valve body 10. The cover body 40 is composed of a cover body main body 41, an engaging projection 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 41 is a disc-shaped member made of synthetic resin or the like, and covers the upper surface of the intake valve body 10. A circular opening 44 is formed in a part of the main body 41 of the cover.

[0024] The indicator opening 44 allows for visual confirmation of the completion of the installation of the first intake valve device 6. Specifically, the color of the indicator opening 44 changes before and after the installation of the first intake valve device 6. Before a predetermined operation, the marker opening 44 allows a view of the upper surface of the second cylindrical body 18, and after a predetermined operation, the top surface of a marker projection (not shown) provided on the upper surface of the second cylindrical body 18 (described later) can be viewed from the marker opening 44. For example, if the second cylindrical body 18 is gray in color, the inside of the marker opening 44 will be gray when the installation is not yet complete. If the top surface of the marker projection (not shown) is red, the inside of the marker opening 44 will turn red when the installation is complete. In other words, the rotational operation of the operating projection 43 switches the color inside the marker opening 44 between a state where the top surface of the marker projection (not shown) is visible and a state where it is not. Therefore, the worker can visually confirm that the installation of the first intake valve device 6 is complete by observing the change in color within the indicator opening 44.

[0025] The engaging projection 42 is provided to engage the cover body 40 with the intake valve body 10, and to separate the cover body 40 from the intake valve body 10. Specifically, it is a roughly rectangular, segmented member having a shape that allows the engaging segment 13 of the intake valve body 10 (described later) to be attached to the inside of the engaged projection 42. The engaged projection 42 protrudes downward from the lower surface of the cover body 41. By attaching the engaging projection 42 to the engaging piece 13, the cover body 40 and the intake valve body 10 are fixed integrally, while a space is provided between the cover body 40 and the intake valve body 10 that allows outside air to communicate. In this embodiment, three engaging protrusions 42 are provided on the cover body 41, but their number and position may be changed as appropriate.

[0026] The operating projection 43 is intended to facilitate the operation of attaching the first intake valve device 6 to the upper branch section 103A. The operating projection 43 is provided to protrude upward from a part of the cover body 41. As a specific operation, when attaching the first intake valve device 6 to the upper branch section 103A, first the first intake valve device 6 is placed inside the upper branch section 103A, and then, while lightly pressing the first intake valve device 6 from above, the mounting device (tool) is positioned so as to span across any two of the operating protrusions 43, and the mounting device is rotated. As a result, the cover body 40 and the first cylindrical member 11, which will be described later, rotate together. Consequently, a part of the fixing packing 16 of the intake valve body 10, which will be described later, attempts to deform in the direction of expanding the diameter, but it cannot expand beyond the inner diameter of the upper branch section 103A, so the fixing packing 16 is pressed against the inner wall of the upper branch section 103A, resulting in a watertight position, and making it impossible to easily remove the first intake valve device 6 (fixed state). In this embodiment, four operating protrusions 43 are provided on the cover body 41, but their number and position may be changed as appropriate within the range that allows operation by a tool.

[0027] The intake valve body 10 is a component that serves as the housing for the valve element 24, which will be described later, and it draws in outside air and also ventilates into the drainage pipe 106. The intake valve body 10 is made of synthetic resin and has a substantially cylindrical shape. The intake valve body 10 consists of a first cylindrical member 11, a sliding piece 15, a fixing packing 16, a second cylindrical member 17, a sealing washer 21, a sealing packing 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 body 10. The first cylindrical member 11 is a member for fixing the cover body 40 relative to the intake valve body 10. The first cylindrical member 11 is formed from a substantially cylindrical first cylindrical body 12 in which a part of the second cylindrical member 17 can be positioned inside, and an engaging piece 13 extending upward from the cylindrical body 12.

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

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

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

[0032] The fixing packing 16 is for fixing the first intake valve device 6 in a watertight state within the upper branch section 103A, and is formed from an elastically deformable resin or the like. The fixing packing 16 is a substantially cylindrical member and is installed on the outer circumferential surface of the second cylindrical member 17. In this state, the upper end of the fixing packing 16 is positioned on the bottom surface of the first cylindrical member 11. In this configuration, the rotation of the cover body 40 causes the first cylindrical member 11 to move relatively downward, so that the fixing packing 16 is pressed from above and below and deformed to protrude radially outward. This deformation of the fixing packing 16 allows the upper branch portion 103A and the first intake valve device 6 to be fixed in a watertight manner.

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

[0034] The second cylindrical body 18 has a groove 20 on its outer circumferential surface that allows the first cylindrical member 11 to rotate while the protrusion of the first cylindrical member 11 is positioned during the installation operation of the first cylindrical member 11, and an intake hole 19 is provided on its upper surface.

[0035] The groove 20 is formed in a so-called helical shape, such that the coordinates on the horizontal plane move continuously when it moves from top to bottom. With this configuration, by rotating the first cylindrical member 11 in a predetermined direction relative to the second cylindrical member 17, the height of the first cylindrical member 11 can be moved in either the vertical or horizontal direction.

[0036] The intake port 19 communicates with the outside air space and draws in outside air when it is open. Under normal conditions, the lower end of the intake port 19 is tightly sealed by the seal portion 23 and the valve body 24, which will be described later, and the outside air space and the drainage pipe 106 are shielded. When negative pressure is generated in the drainage pipe 106, the valve body 24 descends, causing the intake port 19 to open and allowing outside air to flow into the drainage pipe 106.

[0037] The engaging portion, which is not shown, is one that can engage with the engaged portion 54 of the first ventilation member 50, which will be described later, and only needs to have a male-female relationship. Specifically, it can be 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 integrating the intake valve body 10 and the first ventilation member 50.

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

[0039] The seal packing 22 is intended to seat on the second cylindrical member 17 and close the intake hole 19. The seal packing 22 is an annular member with a larger outer diameter than the seal washer 21, and a groove is provided on the inside of the seal packing 22 in which the seal washer 21 can be placed.

[0040] The sealing portion 23 allows the intake port 19 to be closed / opened in accordance with the sliding motion of the valve body 24. The sealing portion 23 is composed of the aforementioned sealing washer 21 and sealing packing 22. The sealing portion 23 is pressed against the valve body 24 while being locked to the top surface of the valve body 24 by the sealing locking 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 its outer shape is formed as 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 vertically within the second cylindrical body 18. The valve body 24 slides to close / open the intake hole 19 of the second cylindrical member 17, using the elastic force of the spring member 27 as a biasing force. In this embodiment, the sliding direction of the valve body 24 is provided parallel to the extension direction of the guide shaft 51, which will be described later. The valve body 24 includes a spring retaining portion 25 and a seal locking portion 26.

[0042] Furthermore, the biasing means for the valve body 24 can be changed as appropriate, as long as it is a mechanism that maintains its position with the intake port 19 closed under normal conditions, such as magnetic force, air pressure, or hydraulic pressure, in addition to using elastic force such as a spring. Furthermore, although the valve body 24 in this embodiment is formed into a cylindrical hollow shape to facilitate floating when the water-flowing side is full, the shape of the valve body 24 is not limited to this and may be appropriately changed to various shapes such as a disc, part of a sphere, a cone, or a pyramidal shape.

[0043] The spring retaining portion 25 extends from a part of the valve body 24 upward from the top surface of the valve body 24, and is formed in a roughly cylindrical shape with its upper end closed and its inner side open. Inside this spring retaining portion 25, the spring member 27 and the guide shaft 51 (described later) are arranged in a predetermined state, whether the spring member 27 is extended or compressed.

[0044] The spring member 27 is a biasing means located inside the valve body 24 to maintain its position so that the valve body 24 is closed to the intake port 19 under normal conditions. The spring member 27 is positioned between the spring holding portion 25 and the guide shaft 51.

[0045] The first ventilation member 50 has a generally disc-like shape overall. The first ventilation member 50 is installed below the intake valve body 10 and prevents splashed wastewater from entering the ventilation opening of the intake valve body 10 within the drainage pipe 106. The first ventilation member 50 consists of a guide shaft 51, a partition portion 52, a wall portion 53, an engaged portion 54, a ventilation opening 55, and an outer peripheral portion 56.

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

[0047] The partition 52 separates the intake valve body 10 side from the water passage side in the first intake valve device 6. The partition 52 allows outside air to be drawn in when the intake valve is open, while physically preventing wastewater splashed from the water passage side from entering the intake valve body 10.

[0048] In this embodiment, the partition 52 is composed of a disc-shaped partition plate 52A positioned inside the outer periphery 56, and a rib 52B extending toward the center from a part of the partition plate 52A, with a ventilation opening 55 for intake formed in a part of the rib. The partition plate 52A protrudes downward relative to the outer periphery, and a stepped portion 57 is formed at the boundary between the outer periphery 56 and the partition plate 52A. The ventilation opening 55 is formed in the central part of the partition plate 52A, excluding the rib 52B.

[0049] The wall portion 53 prevents water splashes from the water-passing side from reaching the partition portion 52. The wall portion 53 extends downward from the lower end of the vent 55. Specifically, the wall portion 53 extends toward the water passage side from a part of the partition plate 52A of the partition portion 52. 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, which will be described later. The wall portion 53 is formed along the periphery of the vent 55 and has a concentric arc shape with the vent 55. Three wall portions 53 are provided so as to surround the periphery of the vent 55. A notch 53A is formed between each wall portion 53, 53, and adjacent wall portions 53, 53 are spaced apart. The notch 53A is for facilitating drainage and, in this embodiment, is formed along the entire length of the wall portion 53 from the lower end to the upper end. The notch 53A only needs to be formed at the lower end of the wall portion 53, and the upper parts of adjacent wall portions 53, 53 may be connected to each other.

[0050] Since the wall portion 53 is located inside the outer peripheral portion 56, the outer peripheral surface of the wall portion 53 and the inner peripheral surface of the drainage pipe 106 are separated by a predetermined distance, and a space is provided between them. Some of the splashed drainage collides with the wall 53 and then flows down along its outer and inner surfaces.

[0051] The engaged portion 54 is for locking the first ventilation member 50 to the intake valve body portion 10. The engaged portion 54 in this embodiment is the part that engages with an engaging portion (claw) not shown, and is shaped to allow engagement of the engaging portion. The engaged portion 54 is formed at three equal intervals along the outer circumference 56. By engaging the engaging portion (not shown) with the engaged portion 54, the intake valve body 10 and the first ventilation member 50 can be integrated.

[0052] (Configuration of the second intake valve system) 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 composed of an intake valve body 10, a cover body 40, and a second ventilation member 150, and the configuration of the second ventilation member 150 differs from that of the first intake valve device 6. The intake valve 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 their description is omitted.

[0053] As shown in Figures 7 and 8, the second ventilation member 150 consists of a guide shaft 51, a partition portion 152, a wall portion 153, an engaged portion 54, a ventilation opening 55, and an outer peripheral portion 56. The second ventilation member 150 differs from the first ventilation member 50 in the configuration of the partition portion 152 and the wall portion 153. The guide shaft 51, engaged portion 54, ventilation opening 55, and 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 the same reference numerals are used and their explanation is 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) are similar in configuration. Specifically, the configurations are known, such as engaging claws formed on the ventilation members 50 and 150 with stepped portions of the piping, screwing male threads formed on the ventilation members 50 and 150 into female threads of the piping, or fitting the ventilation members 50 and 150 into the openings of the piping.

[0054] The partition portion 152 of the second ventilation member 150 is composed of a disc-shaped partition plate 152A positioned inside the outer periphery 56, and a rib 52B extending towards the center from a part of the partition plate 152A, with a ventilation opening 55 for intake formed in a part of the rib. The partition plate 152A has no step between it and the outer periphery 56 and is flush with the bottom surface of the outer periphery 56. The other ribs 52B and the ventilation opening 55 are the same as those of the first ventilation member 50.

[0055] The wall portion 153 extends downward from the lower end of the vent 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 periphery of the vent 55. The wall portion 153 has no notches and exhibits a continuous cylindrical shape around its entire circumference. The cylindrical shape of the wall portion 153 is concentric with the vent 55.

[0056] Since the wall portion 153 is located inside the outer peripheral portion 56, the outer peripheral surface of the wall portion 153 and the inner peripheral surface of the upper branch portion 103A are separated by a predetermined distance, and a space is provided between them. Some of the splashed drainage collides with the wall portion 153 and then flows down along its outer and inner peripheral surfaces.

[0057] The following describes the operation and effects of the piping system 1 according to this embodiment. First, the operation and effects of the first intake valve device 6 equipped with the first ventilation member 50 will be explained using Figure 9. As shown in Figure 9, the drainage flowing from the horizontal pipe 3 towards the vertical pipe 2 is directed downward by the joint 103. However, the increased volume of drainage in the horizontal pipe 3 flows into the joint 103 with the same force, causing it to collide with the inner wall of the joint 103, making splashing of the drainage likely. For example, the splashed drainage W1 shown as W1 to W3 in Figure 9 collides with the outer surface of the wall 53. Also, the splashed drainage W2 and W3 collide with the partition plate 52A (see Figure 2) and the rib 52B (see Figure 2) of the partition 52. As described above, most of the splashed drainage W1 to W3 is stopped by the first ventilation member 50, thus preventing drainage from entering the intake valve body 10 inside the vent 55. The drainage that collides with the first ventilation member 50 travels along the partition plate 52A and the ribs 52B to the wall 53, flows down along the wall 53, and falls from the lower end of the wall 53. At this time, a notch 53A is formed at the lower end of the wall 53, so the drainage tends to collect at the corner of the wall 53 and fall easily.

[0058] Furthermore, at the upper end of the vertical pipe 2, the angle of the splashing drainage W1 with respect to the water surface (hereinafter referred to as the "jumping angle") is large, so by making the downward extension length of the wall portion 53 relatively long, a large amount of drainage W1 is blocked. Drainage that passes under the wall portion 53 has a smaller jumping angle than the blocked drainage W1, so it is less likely to reach the vent 55. In addition, since the first intake valve device 6 is equipped with a stepped portion 57 on its lower surface, the lower end position of the wall portion 53 can be lowered even further, and more drainage W1 can be blocked. Also, by providing the stepped portion 57, drainage that reaches the outer circumference 56 is more likely to fall.

[0059] As described above, the first ventilation member 50 for the vertical piping 2 can effectively block the drainage W1 to W3 that splashes towards the ventilation opening 55. In other words, the first intake valve device 6 equipped with the first ventilation member 50 can provide effects specifically tailored to the vertical piping 2.

[0060] Next, the effects of the second intake valve device 7 equipped with the second ventilation member 150 will be explained using Figure 10. As shown in Figure 10, the wastewater W11 that bounces within the horizontal pipe 3 bounces diagonally upward from the surface of the wastewater flowing downstream. The bounced wastewater W1 is prevented from reaching the inner vent 55 by colliding with the outer surface of the wall portion 153. Since the bounce angle of the jumping wastewater W11 is small within the horizontal pipe 3, there is little wastewater that bounces directly toward the vent 55. Therefore, the second ventilation member 150 for the horizontal pipe 3 has a wall portion 153 that extends downward shorter than the wall portion 53 of the first ventilation member 50. This prevents the scooping up of wastewater W12, which has an even smaller bounce angle, while efficiently suppressing the bounce of wastewater W11 toward the vent 55. In addition, since the wall portion 153 does not have a notch and is formed as a continuous structure around its entire circumference, it prevents the intrusion of wastewater W11 from the side.

[0061] As described above, the second intake valve device 7 for the horizontal piping 3 can efficiently block the drainage W11 that splashes towards the second ventilation member 150. In other words, the second intake valve device 7 equipped with the second ventilation member 150 can provide effects specifically tailored to the horizontal piping 3.

[0062] As explained above, the present invention focuses on the fact that in vertical piping 2, wastewater that splashes relatively upward tends to reach the first ventilation member 50, while in horizontal piping 3, wastewater that splashes sideways tends to reach the second ventilation member 150. Furthermore, according to the piping system 1 of this embodiment, a first intake valve device 6 equipped with a first ventilation member 50 suitable for vertical piping 2 and a second intake valve device 7 equipped with a second ventilation member 150 suitable for horizontal piping 3 are provided in appropriate locations, thereby effectively preventing contamination by wastewater that splashes in different ways depending on the piping shape.

[0063] Furthermore, since the first ventilation member 50 is equipped with a wall portion 53 and the second ventilation member 150 is equipped with a wall portion 153, splashing drainage from below hits the wall portions 53 and 153, effectively preventing it from entering the ventilation opening 55.

[0064] In this embodiment, since the wall portion 153 of the second ventilation member 150 has a shorter extension length compared to the wall portion 53 of the first ventilation member 50, by providing the second ventilation member 150, which has a wall portion with a shorter extension length, to the horizontal pipe 3 where the angle of inclination of splashing in the horizontal direction is small, it is possible to efficiently receive only the drainage that reaches the vent opening, without receiving splashing drainage that does not reach the vent opening, 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 opening 55, and a notch portion 53A is formed at the lower end of the wall portion 53. By providing the first ventilation member 150 in the vertical pipe 2, where the angle of inclination of splashing with respect to the horizontal direction is large and drainage can easily reach the ventilation opening 55, the drainage that reaches the ventilation opening 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 are the same. Therefore, even if the piping configuration changes at the construction site, for example, the first ventilation member 50 and the second ventilation member 150 are changed, it is possible to accommodate these changes and install them easily.

[0067] On the other hand, if negative pressure is generated in the drain vertical pipe 105, the pressure near the valve body 24 in the intake valve body 10 decreases through the vent 55 of the first ventilation member 50 of the first intake valve device 6 and the vent 55 of the second ventilation 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 port 19 opens. Outside air enters the drain pipe 106 through the opened intake port 19, and the differential pressure is eliminated. This prevents the water in the S-trap of the drain pipe from being drawn out. After the differential pressure is eliminated, the valve body 24 rises, the intake port 19 closes, and the system returns to its normal state.

[0068] Although embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and can be modified as appropriate without departing from its spirit. For example, in the above embodiment, a notch 53A is provided in the wall portion 53 to facilitate drainage, but the invention is not limited to this. The wall portion may be formed in a cylindrical shape, and a projection protruding downward may be provided at the lower end of the cylinder. With such a configuration, drainage that flows into the wall portion will collect at the projection and fall more easily. [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 portion 55 Ventilation holes 150 Second ventilation member 153 Wall

Claims

1. An intake valve device installed in a drainage pipe, It comprises an intake valve body, a cover body that covers the upper part of the intake valve body, a ventilation member attached below the intake valve body, and a ventilation opening provided in the ventilation member, The ventilation member includes a partition that prevents drainage from entering the intake valve body from the water passage side, It is equipped with a wall portion that prevents the drainage from the water-conducting side from reaching the partition portion, The aforementioned wall portion is integrally provided so as to extend from a part of the partition portion toward the water passage side, and is curved in an arc shape. An intake valve device characterized by the following features.

2. The ventilation member has an annular shape overall, The partition portion is formed from a plate-like member that extends substantially horizontally, The outer edge of the aforementioned vent is formed in an arc shape. The intake valve device according to feature 1.

3. Multiple ventilation openings are provided in relation to the partition section. The outer peripheral edge and the ventilation member are formed to be concentric. The intake valve device according to feature 2.

4. The partition comprises a disc-shaped partition plate positioned inward from the outer periphery, and a rib extending toward the center from a portion of the partition plate. The wall portion is formed perpendicular to the outer edge of the partition plate. The intake valve device according to feature 1.

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