JP2018165538A - Vent valve and piping structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vent valve capable of closing a vent hole more surely.SOLUTION: A vent valve 100 includes: a vent valve body 110; a valve body 120; and a packing 130 arranged between a body side holding surface 115 and a valve body side holding surface 122, and held and pressed by the body side holding surface 115 and the valve body side holding surface 122 when the valve body 120 moves to a closed position. The packing 130 includes: a fixing part 138 fixed to the vent valve body 110; and a sealing part 131 extending from a base end adjacent to the fixing part 138 to a tip, and elastically deforms by being held and pressed by the body side holding surface 115 and the valve body side holding surface 122. The sealing part 131 has a first surface 132 opposing to the body side holding surface 115. In a cross sectional view cut along the radial direction of an original shape of the sealing part 131, when the valve body 120 is in an open position, a second surface 133 of the sealing part 131 has a substantially linear shape, and is inclined with respect to the valve side holding surface 122 so that a distance between itself and the valve side holding surface 122 reduces toward the tip.SELECTED DRAWING: Figure 13

Description

  The present invention relates to a ventilation valve attached to a piping material in order to eliminate the negative pressure inside the piping material, and a piping structure provided with the ventilation valve.

  In general, drainage pipes are disposed in drainage systems such as kitchen sinks, bathtubs, and toilets installed in buildings in order to treat wastewater. Such a drain system piping structure includes a drain pipe having a trap portion curved in an S-shape or U-shape, and is configured to collect drainage in the trap portion. Residual wastewater collected in this trap section blocks the inside of the drainage pipe so that bad odor drifting from the downstream of the drainage pipe does not leak into the room, and also prevents the invasion of pests rising from the downstream side of the drainage pipe . However, if a large amount of water flows through the drain pipe and the atmospheric pressure in the drain pipe decreases to a negative pressure, the residual drainage in the trap portion may be sucked and flowed downstream. In order to prevent the sealing water breakage in the trap part, a ventilation valve is disposed downstream of the trap part of the drain pipe. And when the inside of a drain pipe becomes a negative pressure, outside air is attracted | sucked in a drain pipe through this vent valve, and the negative pressure state of a drain pipe is eliminated, The sealing water damage of a trap part is prevented.

  For example, Patent Document 1 discloses a vent valve that can more quickly and reliably eliminate the negative pressure in the piping material. Hereinafter, in the paragraph, reference numerals of Patent Document 1 are shown in parentheses. The ventilation valve (100) includes a ventilation valve body (110) connected to the drain pipe (P), and a valve body (130) accommodated in the ventilation valve body (110) and connected to the first magnet (M1). A second magnet holder (150) that holds the second magnet (M2) movably along the valve shaft (135) of the valve body (130), and protects the valve body (130). A cover body (170) attached to one end of the vent valve main body (110). A circular vent (112) that is opened and closed by the valve body (130) is formed. A valve seat (113) is provided on the lower end side so as to border the vent (112). When the packing (132) of the valve body (130) is in close contact with the valve seat (113), the vent (112) is closed. And the connection port (119) for connecting with the connection end (P ') of a drain pipe (P) is formed in the lower end of this vent valve main body (110). When the inner cylindrical wall (119a) of the connection port (119) is fitted into the connection end (P ') of the drain pipe (P), the vent valve (100) is attached to the drain pipe (P). In the piping structure (10), when the negative pressure in the drain pipe (P) increases, a pressure difference is generated inside and outside the vent valve body (110) via the valve body (130), and the pressure difference is generated by the first magnet ( When the repulsive force between M1) and the second magnet (M2) is exceeded, the valve body (130) starts moving toward the open position along the axial direction of the valve shaft (135). When the valve body (130) moves to the open position, outside air is sucked through the vent (112). As a result, the negative pressure in the drain pipe (P) is eliminated.

Japanese Patent Laying-Open No. 2015-232369

  In the vent valve of Patent Document 1, the packing is integrally attached to the valve body. In such a conventional vent valve, when the contact of the packing with the valve seat is not uniform, there may be a place where the packing does not contact the valve seat. For example, the movement of the valve body from the open position to the closed position is inclined from the axial direction due to factors such as no uniform force being applied to the valve body and low extension accuracy of the valve shaft. When abutting on the seat, a portion where the packing and the valve seat do not contact each other partially occurs. As a result, the blockage by the ventilation valve may be insufficient. Alternatively, even when there are minute irregularities or undulations on the valve seat surface, a gap is likely to occur between the packing and the valve seat. That is, in the conventional vent valve, when the contact of the packing with the valve seat is not uniform, there is a possibility that a gap is generated between the packing and the valve seat and the vent is not sufficiently closed.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a vent valve and a pipe structure that can more reliably close the vent.

The vent valve according to claim 1, a vent valve body having a vent,
A valve body movably supported by the vent valve main body so that the vent can be opened and closed;
The valve body is disposed between a body-side clamping surface provided at a peripheral edge of a vent inside the ventilation valve body and a valve-side clamping surface provided in the valve body so as to face the body-side clamping surface. A packing configured to seal the vent hole by being clamped by the main body side clamping surface and the valve body side clamping surface when moved to the closed position,
The packing extends from the proximal end adjacent to the stationary portion to the distal end, and is elastically deformed by being sandwiched between the body-side clamping surface and the valve body-side clamping surface. A sealing portion,
The sealing portion has a first surface facing the body-side clamping surface, and a second surface facing the valve body-side clamping surface,
In a cross-sectional view cut along the radial direction of the original shape of the sealing portion, when the valve body is in the open position, the second surface of the sealing portion has a substantially linear shape and faces the tip. Accordingly, the valve body side clamping surface is inclined so that the distance from the valve body side clamping surface becomes smaller.

  The vent valve according to claim 2 is the vent valve according to claim 1, wherein when the valve body moves from the open position to the closed position, a tip portion of the second surface of the sealing portion is the valve. It is comprised so that it may contact | abut to a body side clamping surface first.

  According to a third aspect of the present invention, in the vent valve according to the first or second aspect, the valve body moves from the open position toward the closed position, and the sealing portion is elastically deformed to hold the main body side. When abutting on a surface, the distal end portion of the first surface of the sealing portion abuts prior to the body-side clamping surface, and the first surface and the body-side clamping surface are closer to the base end side than the distal end portion. A gap is formed between the two.

  The vent valve according to claim 4 is the vent valve according to any one of claims 1 to 3, wherein the main body side clamping surface and the valve body side clamping surface facing each other are both flat surfaces on which the vent hole extends. It is characterized by being inclined with respect to.

  The ventilation valve according to claim 5 is the ventilation valve according to any one of claims 1 to 4, wherein the first surface of the sealing portion and the body-side clamping surface are at the proximal end of the sealing portion. It is characterized by being separated by a predetermined distance.

  A vent valve according to a sixth aspect of the present invention is the vent valve according to any one of the first to fifth aspects, wherein the main body side holding surface is a protrusion interposed between the sealing portion and the main body side holding surface. It is characterized in that the ridge is projected.

  The piping structure according to claim 7 is a piping structure in which piping material is piped, and the vent valve according to any one of claims 1 to 6 so as to eliminate the negative pressure in the piping material. Is connected to the opening of the piping material.

  According to the vent valve of the first aspect, in the cross-sectional view cut along the radial direction of the original shape of the sealing portion, the substantially straight second surface of the sealing portion is sandwiched on the valve body side toward the tip. It inclines with respect to the valve body side clamping surface so that the distance between surfaces may become small. Therefore, when the valve body moves from the open position to the closed position, at least a part of the second surface of the sealing portion located on the distal end side with respect to the proximal end comes into contact with the valve body-side clamping surface with priority. And the contact part of the front end side of a sealing part is pressed by the valve body side clamping surface, the applicable contact part of the 1st surface of a sealing part contact | abuts prior to a main body side clamping surface, The contact portion is elastically deformed so as to be preferentially crushed. As a result, the sealing portion can be crushed so that the pressure contact area gradually increases from the contact portion of the sealing portion. That is, the sealing portion can be more efficiently crushed by the main body side clamping surface and the valve body side clamping surface, and the vent hole can be more reliably closed. Therefore, according to the vent valve of the present invention, the vent can be more reliably closed.

  According to the vent valve of the second aspect, in addition to the effect of the invention of the first aspect, when the valve body moves from the open position to the closed position, the distal end portion of the second surface of the sealing portion is on the valve body side. First contact the clamping surface. And the front-end | tip part of the 1st surface of a sealing part contact | abuts prior to a main-body side clamping surface by the front-end | tip part of a sealing part being pressed by the valve body side clamping surface, and the front-end | tip part of a sealing part has priority. It is elastically deformed to collapse. As a result, the sealing portion can be crushed so that the pressure contact area gradually increases from the tip portion of the sealing portion. That is, the sealing portion can be more efficiently crushed by the main body side clamping surface and the valve body side clamping surface, and the vent hole can be more reliably closed.

  According to the vent valve of the third aspect, in addition to the effect of the invention of the first or second aspect, when the sealing portion is elastically deformed and comes into contact with the body-side clamping surface, the first surface of the sealing portion Since the tip portion comes into contact with the main body side clamping surface, the tip portion of the sealing portion is elastically deformed so as to be preferentially crushed. At this time, the gap formed on the proximal end side with respect to the distal end portion becomes a space that allows elastic deformation of the sealing portion toward the proximal end side. As a result, the sealing portion can be crushed so that the pressure contact area gradually increases from the distal end portion of the sealing portion to the proximal end side. That is, the sealing portion can be more efficiently crushed by the main body side clamping surface and the valve body side clamping surface, and the vent hole can be closed more reliably.

  According to the vent valve of the fourth aspect, in addition to the effect of the invention of any one of the first to third aspects, the body-side clamping surface and the valve body-side clamping surface that face each other with respect to the plane in which the vent hole extends. By inclining both of them, an inclined air passage is formed, and air circulation becomes efficient.

  According to the vent valve of the fifth aspect, in addition to the effect of the invention of any one of the first to fourth aspects, the first surface of the sealing portion and the body-side clamping surface are predetermined at the proximal end of the sealing portion. When the sealing portion is tilted and deformed toward the main body side clamping surface, the distal end portion of the sealing portion is not brought into contact with the main body side clamping surface. Can be preferentially brought into contact with the holding surface on the main body side. That is, the distal end portion of the first surface of the sealing portion abuts prior to the body-side clamping surface, and elastically deforms so that the distal end portion of the sealing portion is preferentially crushed. As a result, the sealing portion can be crushed so that the pressure contact area gradually increases from the tip portion of the sealing portion. That is, the sealing portion can be more efficiently crushed by the main body side clamping surface and the valve body side clamping surface, and the vent hole can be more reliably closed.

  According to the vent valve of the sixth aspect, in addition to the effect of the invention of any one of the first to fifth aspects, the ridge portion provided on the holding surface on the main body side so as to contact the sealing portion is a valve When the body moves from the closed position to the open position, the sealing portion is prevented from adhering to the main body side clamping surface, and assists the elastic return to the original shape of the sealing portion.

  According to the piping structure of the seventh aspect, the effect of the vent valve according to any one of the first to sixth aspects can be exhibited as the piping structure. That is, the piping structure of the present invention can reliably close the opening of the piping material by the vent valve.

BRIEF DESCRIPTION OF THE DRAWINGS (a) The perspective view from upper direction of the ventilation valve of one Embodiment which concerns on this invention, (b) The perspective view from the downward direction. The (a) top view, (b) front view, (c) side view, and (d) bottom view of the vent valve of FIG. 1. (a) Top view, (b) Front view, (c) Side view and (d) Bottom view of the vent valve in the state where the lid is removed, which is the vent valve of FIG. FIG. 3 is a cross-sectional view of the vent valve main body of FIG. BB sectional drawing of the vent valve main body of FIG. CC sectional drawing of the vent valve main body of FIG. The (a) perspective view, (b) top view, (c) side view, (d) bottom view, and (e) DD sectional view of the packing of the vent valve of FIG. FIG. 2 is an exploded perspective view of the vent valve of FIG. 1. The exploded perspective view of the piping structure of one embodiment concerning the present invention. The schematic sectional drawing which shows 1 process for constructing | assembling the piping structure of one Embodiment which concerns on this invention. The schematic sectional drawing of the state where the communicating path was obstruct | occluded in the piping structure of one Embodiment which concerns on this invention. In the piping structure of one embodiment concerning the present invention, the schematic sectional view in the state where the communicating passage was opened. The piping structure (open state) of one embodiment concerning the present invention WHEREIN: The partial expanded end view showing packing in an original shape. The piping structure (intermediate stage 1) of one Embodiment concerning this invention WHEREIN: The partial expanded end elevation which shows the packing of the state in which the valve body side clamping surface contact | abutted to the sealing part. The piping structure (intermediate stage 2) of one Embodiment concerning this invention WHEREIN: The partial expanded end elevation which shows the packing of the state elastically deformed partially. The partial expanded end view which shows the packing of the state which was crushed in the piping structure (blocking state) of one Embodiment which concerns on this invention. Sectional drawing of the vent valve of the modification which concerns on this invention. Sectional drawing of the vent valve of the modification which concerns on this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In addition, the shape of each figure referred in the following description is a conceptual diagram or a schematic diagram for explaining a suitable shape dimension, and a dimension ratio etc. do not necessarily correspond with an actual dimension ratio. That is, the present invention is not limited to the dimensional ratio in the drawings. In addition, the vertical and horizontal directions in the present invention are merely a concept indicating a relative position, and needless to say, these can be applied interchangeably.

  A piping structure 10 according to an embodiment of the present embodiment is a drainage piping structure in which a drain pipe (pipe material) is disposed. The pipe structure 10 is provided with a hollow cylinder portion 13 that opens to the outside and forms a communication path that communicates with the inside and outside of the piping material 11. The pipe structure 10 is vented to the opening of the cylinder section 13 to close the communication path. The valve 100 is mounted (see FIG. 9). However, it is needless to say that this embodiment is merely an example of the present invention and does not limit the application and configuration. Hereinafter, the configuration of the vent valve 100 of the present embodiment will be described with reference to the drawings.

  1A and 1B are perspective views of a vent valve 100 according to an embodiment of the present invention. 2A to 2D are a plan view, a front view, a side view, and a bottom view of the vent valve 100. FIG. 3A to 3D are a plan view, a front view, a side view, and a bottom view of the vent valve 100 in which the cover body 140 is omitted for convenience of explanation. FIG. 4 is a cross-sectional view of the vent valve 100 taken along the line AA. 5 and 6 are a BB sectional view and a CC sectional view cut along the radial direction of the vent valve 100. FIG.

  The vent valve 100 is fixed to an opening of a cylindrical tube portion of the piping material, and is configured to selectively close and communicate the communication path according to pressure fluctuation in the piping material. As shown in FIGS. 1 and 2, the vent valve 100 includes a vent valve main body 110 attached to an opening of a piping material, a valve body 120 supported by the vent valve main body 110 movably in the axial direction, A packing 130 fixed inside the vent valve body 110 and disposed so as to be in close contact with the valve body 120, and a cover body attached to an end of the vent valve body 110 on the side of the vent hole 110a so as to protect the valve body 120. 140.

  The vent valve body 110 has a cylindrical shape with both ends open and extending along the axial direction. In other words, the vent valve body 110 has a vent 110a for taking outside air into the piping material at the upper end (external side of the piping material), and a connection port connected to the piping material at the lower end (inside of the piping material). 110b. The ventilation port 110a and the connection port 110b extend on a plane perpendicular to the axial direction. A valve body accommodating space 110c for movably accommodating the valve body 120 is provided in a space between the vent hole 110a and the connection port 110b of the vent valve body 110.

  The vent valve main body 110 is connected to the peripheral wall 111 surrounding the valve body accommodating space 110c, the upper wall 111 connected to the upper end of the peripheral wall 111 and forming the opening peripheral surface of the vent hole 110a, and the upper wall 111 standing up from the upper wall 111. And a standing wall 113 provided.

  The peripheral wall 111 is inserted in the cylinder part of piping material, and has an outer peripheral surface extended in an axial direction so that the inner peripheral surface of a cylinder part may be met. In addition, a connection port 110b facing downward is formed by the opening end surface on the lower side of the peripheral wall 111. As shown in FIGS. 5 and 6, a concave groove 111 a extending in the circumferential direction is formed in the vicinity of the connection port 110 b of the peripheral wall 111. A water stop member 118 made of an annular rubber is accommodated in the concave groove 111a. The water stop member 118 slightly protrudes from the outer peripheral surface of the peripheral wall 111 and is crushed and closely adhered to the inner peripheral surface of the pipe material cylinder portion when the vent valve 100 is mounted, thereby stopping the gap between the vent valve main body 110 and the pipe material. Functions like water.

  The upper wall 112 extends in the shape of an annulus so as to face upward around the vent 110a that opens with a predetermined diameter. In addition, a body-side clamping surface 115 is provided on the periphery of the vent 110 a inside the vent valve body 110 of the upper wall 112. That is, as shown in FIGS. 5 and 6, a ring-shaped body-side clamping surface 115 is defined on the opening peripheral surface of the upper wall 112 inside the ventilation valve body 110 so as to face the valve body 120. . The main body side clamping surface 115 is inclined so that the outer peripheral side is lowered with respect to the axial direction in a cross-sectional view and extends in a straight shape, and faces obliquely downward (inner radial direction and lower axial direction). Furthermore, the main body side clamping surface 115 is formed with a protrusion 115a that slightly protrudes along the circumferential direction (see FIG. 13).

  Further, as shown in FIGS. 3 and 4, three beam-like portions 112 a extending toward the radial center at equal intervals are formed on the upper surface of the upper wall 112. The main body side magnet holding part 117 is supported at the center of the vent 110a by these beam-like parts 112a. As shown in FIGS. 5 and 6, the main body side magnet holding portion 117 is provided with a shaft hole 117 a penetrating vertically and inserting the valve shaft 123 of the valve body 120. In the main body side magnet holding portion 117, an annular main body side magnet 117b is fitted and held in a groove around the shaft hole 117a. The main body side magnet 117b is made of a permanent magnet such as a neodymium magnet and functions to exert a repulsive force on a valve body side magnet 124a described later.

  A pair of standing walls 113 are erected from substantially the center in the radial direction of the upper wall 111 so as to face each other. The pair of standing walls 113 have an arc shape so that the concave curved surface is directed radially inward in plan view. That is, the outer peripheral surface of the peripheral wall 111, the inner peripheral edge of the upper wall 112, and the outer surface of the standing wall 113 are located on concentric circles (of different diameters). The outer surface of the upright wall 113 is at a position retracted radially inward from the outer peripheral surface of the peripheral wall 111. A screw receiving portion 114 is formed on the outer surface of each standing wall 113 to receive the screw 150. Each screw receiving portion 114 is disposed on the axially upper side (outside of the piping material) of the water stop member 118. The screw receiving portion 114 includes a concave curved surface that faces outward in the radial direction and is curved in a concave shape. The distance (in plan view) between the concave curved surface of the screw receiving portion 114 and the outer peripheral surface of the peripheral wall 111 is determined to be not more than the diameter of the screw 150. The radius of curvature of the concave curved surface of the screw receiving portion 114 preferably corresponds to the axial diameter of the screw 150 (at the trough). Furthermore, a connecting piece 113a for fixing the cover body 140 in a fitting manner is provided at the upper end of the standing wall 113 so as to protrude upward.

  A packing 130 is attached inside the vent valve main body 110 so as to cover the main body side clamping surface 115. The packing 130 is an annular body made of elastically deformable rubber or soft synthetic resin having an opening at the center. 7A to 7E are a perspective view, a plan view, a side view, a bottom view, and a DD sectional view of the packing 130 of the vent valve 100. FIG. As shown in FIG. 7, the packing 130 includes a sealing portion 131 located on the inner peripheral side and a fixing portion 138 located on the outer peripheral side and fixed to the vent valve main body 110. The sealing portion 131 extends from the base end 131a adjacent to the fixed portion 138 to the tip 131b (the inner peripheral end of the opening). In a cross-sectional view cut along the radial direction, the sealing portion 131 is inclined so that the outer peripheral side is lowered with respect to the axial direction, extends substantially linearly, and has a straight first surface 132 that faces obliquely upward. (Upper surface) and a straight second surface 133 (lower surface) facing diagonally downward. The first surface 132 and the second surface are parallel to each other. As shown in FIGS. 5 and 6, the sealing portion 131 of the packing 130 extends radially inward from the inner wall surface of the vent valve main body 110 to cover the main body side clamping surface 115. On the other hand, the fixing portion 138 of the packing 130 is embedded and fixed inside the inner wall surface (the peripheral wall 111 and the upper wall 112) of the vent valve main body 110. That is, the proximal end 131a and the distal end 131b of the sealing portion 131 of the packing 130 become a fixed end and a free end, respectively. As will be described later, the sealing portion 131 can be elastically deformed so as to be close to or separated from the main body side clamping surface 115.

  The valve body 120 is accommodated in the valve body accommodating space 110c of the ventilation valve body 110, and is supported by the ventilation valve body 110 so as to move along the axial direction. The valve body 120 includes a valve body main body 121 formed in a circular cup shape in plan view, a valve shaft 123 extending upward from the center of the valve body main body 121, and a valve body side magnet formed at the upper end of the valve shaft 123. Holding part 124.

  A valve body side clamping surface 122 is formed on the outer surface of the valve body main body 121. As shown in FIGS. 5 and 6, the valve-side clamping surface 122 extends in a straight line with an inclination so that the outer peripheral side is lowered with respect to the axial direction in a sectional view cut along the radial direction. It faces the direction (radially outer side and axially upper side). That is, the valve body side clamping surface 122 faces the body side clamping surface 115 of the vent valve body 110 with the packing 130 interposed therebetween. And the valve body side clamping surface 122 and the main body side clamping surface 115 are inclined with respect to the plane in which the vent 110a extends so as to face each other.

  As shown in FIGS. 4 to 6, the valve shaft 123 is disposed on the central axis of the vent 110 a and passes through the shaft hole 117 a of the main body side magnet holding portion 117 of the vent valve main body 110. At the upper end of the valve shaft 123, a valve body side magnet holding portion 124 that is located above the main body side magnet holding portion 117 and has a diameter larger than the diameter of the shaft hole 117a is provided. The valve body side magnet holding part 124 holds the valve body side magnet 124a inside. The valve body side magnet 124a is made of a permanent magnet such as a neodymium magnet. The valve body side magnets 124a are arranged so as to repel each other with respect to the main body side magnet 117b. That is, the opposing magnetic poles of the main body side magnet 117b and the valve body side magnet 124a are the same. A magnetic repulsive force (repulsive force) is generated between the main body side magnet 117b and the valve body side magnet 124a, and the valve body 120 is urged by the magnetic force so as to float upward. As a result, the valve body side clamping surface 122 of the valve body main body 121 is in pressure contact with the packing 130 and closes the vent hole 110a. On the other hand, when a downward force exceeding the magnetic force is applied to the valve body 120 (in general, when the inside of the piping material becomes negative pressure), the valve body 120 moves downward along the axial direction. The valve element side clamping surface 122 is separated from the packing 130, and the vent 110a is opened. At this time, since the valve shaft 123 moves through the shaft hole 117a, the movement of the valve body 120 in the axial direction is stably guided by the main body side magnet holding portion 117.

  The cover body 140 is configured to cover the vent hole 110a from above in order to protect or prevent dust inside the vent valve body 110 and the valve body 120. The cover body 140 has a circular shape in plan view. Two slit-shaped connecting holes 141 are formed on the outer peripheral side of the cover body 140. In addition, two notch portions 142 are formed in a substantially rectangular shape in a plan view on the radially outer side of the two connecting holes 141 on the outer peripheral edge of the cover body 140. The cover body 140 is detachably fitted to the vent valve body 110 by fitting the connecting piece 113a of the vent valve body 110 into the connecting hole 141. A C-shaped screw holding portion 143 is formed in each notch portion 142. As shown in FIGS. 1 and 2, the two screws 150 are held by the two screw holding portions 143, respectively. As will be described later, the two screws 150 are removed from the screw holding portion 143 when the ventilation valve 100 is fixed to the pipe material tube portion.

  FIG. 8 is an exploded perspective view of the vent valve 100 of the present embodiment. As shown in FIG. 8, the vent valve main body 100 is formed by combining an upper divided body 110-1 and a lower divided body 110-2. The upper divided body 110-1 has a female threaded portion at the lower end, the lower divided body 110-2 has a male threaded portion at the upper end, and the upper divided body 110-1 and the lower divided body 110-2 can be screwed together. It is. Then, the packing 130 is fixed by screwing the upper divided body 110-1 and the lower divided body 110-2 so as to sandwich the packing 130 between the upper divided body 110-1 and the lower divided body 110-2. The vent valve body 110 is constructed by fixing the part 138 so as to be embedded in the wall. Further, by inserting the valve shaft 123 of the valve body 120 into the shaft hole 117a of the vent valve body 110 from below and screwing or bonding the valve body side magnet holding portion 124 to the upper end of the valve shaft 123, the valve body 120 is The vent valve body 110 is supported to prevent falling off. The cover body 140 is detachably fitted to the vent valve main body 110 by inserting a connecting piece 113a extending upward from the tip of the standing wall 113 of the vent valve main body 110 into the connection hole 141 of the cover body 140. The Thus, the ventilation valve 100 is constructed. The upper divided body 110-1, the lower divided body 110-2, the valve body 120, and the cover body 140 of the present embodiment are formed by molding a hard synthetic resin material, but the present invention is not limited to this, A person skilled in the art can arbitrarily select the material.

  FIG. 9 is an exploded perspective view of the piping structure 10 of the present embodiment. As shown in FIG. 9, in this embodiment, two drain pipes 11 are connected via a drain pipe joint 12 branched in three directions. The drainage pipe joint 12 has three connection ports, two drainage pipes 11 are connected to two of the connection ports, and one connection port opens upward. That is, the drain pipe joint 12 (which is a kind of drain pipe) has a cylindrical portion that opens to the outside and extends in the axial direction so as to form a communication path that communicates with the inside and outside of the piping material (drain pipe 11 or drainage system). 13 is provided. A ventilation valve 100 is attached to the hollow cylindrical portion 13 so as to selectively close the communication path. As shown in FIG. 10, the vent valve 100 can be pushed into the cylindrical portion 13 and selectively fixed to the cylindrical portion 13 with screws 150. In addition, a drain pipe, a drain pipe joint, and a drainage system are named generically as piping materials in this specification.

  FIG. 11 is a cross-sectional view of the piping structure 10 in which the ventilation valve 100 is fixed to the cylindrical portion 13. As shown in FIG. 11, the inside of the drain pipe 11 of the piping structure 10 is at normal pressure or positive pressure, the valve body 120 of the vent valve 100 seals the vent 110 a, and the vent valve 100 communicates with the inside and outside of the drain pipe 11. The communication path to be closed is blocked. Further, the water stop member 118 is crushed by being pressed against the inner peripheral surface of the tube portion 13, and the outer peripheral surface of the peripheral wall 111 of the vent valve main body 110 and the inner peripheral surface of the tube portion 13 are stopped. Thus, in the closed state where the drainage pipe 11 is not under negative pressure, the biasing force due to the magnetic force exceeds the force in the opening direction acting on the valve body 120, and the valve body 120 steadily blocks the vent hole 110a. And in this piping structure 10, while preventing the bad smell drifting from the downstream of the drain pipe 11 from leaking indoors, the invasion of the pest that crawls up from the downstream side of the drain pipe 11 is also prevented.

  And if the negative pressure in the drain pipe 11 becomes large from the steady blockage state, the valve body accommodating space 110c in the vent valve body 110 communicating with the drain pipe 11 also becomes negative pressure. As a result, a pressure difference is generated inside and outside the vent valve body 110 via the valve body 120 (and the vent 110a), and this pressure difference acts to move the valve body 120 in the opening direction. When the force in the opening direction acting on the valve body 120 exceeds the repulsive force between the magnets 117b and 124a, the valve body 120 starts moving toward the opening position along the axial direction. Along with the movement of the valve body 120, the valve body side magnet holding part 124 moves close to the main body side magnet holding part 117 along the axial direction. Then, as shown in FIG. 12, the valve body 120 reaches an open position where the valve body 120 is sufficiently opened, and the outside air is sucked through the vent 110a. When the valve body 120 is in the open position, the packing 130 is attached to the inside of the vent valve main body 110, so that the surface of the packing 130 is hardly exposed to the outside. That is, compared with the case where the packing is attached to the upper surface of the valve body, the ratio of the packing exposed to the outside is very small, so that adhesion of sewage or the like to the packing 130 is effectively reduced. . Further, in the open state, the main body side magnet holding portion 117 and the valve body side holding surface 122 are inclined obliquely from the axial direction, so that an inclined air passage is formed and air circulation is efficient. Furthermore, since the packing 130 is attached not to the valve body 120 but to the ventilation valve main body 110, the valve body 120 becomes relatively light. Thereby, the operation of the valve body 120 becomes light, such that the initial movement of the valve body 120 becomes faster and the minute operation of the valve body 120 becomes possible. As a result, the negative pressure in the drain pipe 11 is more reliably and quickly resolved.

  When the negative pressure in the drain pipe 11 is eliminated, the force acting on the valve body 120 due to the negative pressure disappears, and the repulsive force of the main body side magnet holding portion 117 and the valve body side magnet holding portion 124 causes the valve body 120 to be Return to the closed position indicated by 11.

  Next, the operation of the packing 130 in the series of opening / closing operations of the valve body 120 described above will be described in detail. In particular, referring to FIGS. 13 to 16, when the ventilation valve 100 changes from the open state to the closed state, the packing 130 is deformed by being compressed by the main body side clamping surface 115 and the valve body side clamping surface 122. This will be explained step by step. FIG. 13 is a partially enlarged end view of the vent valve 100 when the vent valve 100 is in an open state (or before the valve body 120 comes into contact with the packing 130). FIG. 14 is a partially enlarged end view of the intermediate stage 1 before the valve body 120 abuts against the packing 130 and the packing 130 is refracted and deformed. FIG. 15 is a partially enlarged end view of the intermediate stage 2 before the valve body 120 abuts on the packing 130 and the refractively deformed packing 130 is crushed. FIG. 16 is a partially enlarged end view of the packing 130 in a closed state of the vent valve 100.

  In the open state of FIG. 13, the main body side clamping surface 115 and the valve body side clamping surface 122 are separated from each other, and the vent 110a is opened. At this time, the packing 130 (sealing part 131) has an original shape and covers the main body side clamping surface 115 from below. In the original shape of the sealing portion 131, the first surface 132 of the sealing portion 131 is opposed to the body-side clamping surface 115, and from the radially outer side (base end 131a) toward the radially inner side (tip 131b). It is separated from the main body side holding surface 115 so that the distance from the main body side holding surface 115 is increased. Further, the second surface 133 of the sealing portion 131 is arranged on the valve body side so that the distance from the valve body side clamping surface 115 decreases from the radially outer side (base end 131a) toward the radially inner side (tip 131b). It is inclined with respect to the clamping surface 131. Then, at the base end 131a of the sealing portion 131, the first surface 132 and the main body side clamping surface are arranged so that the first surface 132 does not contact the main body side clamping surface 115 (forms a gap 135) at the base end 131a during pressure contact. 115 is separated by a predetermined distance. Here, the “distance” is a linear distance between the first surface (second surface) and the main body side clamping surface (valve element side clamping surface) along the axial direction. In other words, the sealing portion 131 does not contact the main body side clamping surface 115 over the whole, and the free end (tip 131b) approaches the valve body side clamping surface 122 side (opposite each other). It is inclined with respect to the clamping surface 122 and the main body side clamping surface 115. In the present embodiment, the inclination angle of the first surface 132 with respect to the body-side clamping surface 115 is about 4 degrees. On the other hand, the inclination angle of the second surface 133 with respect to the valve element side clamping surface 122 is about 5 degrees. The sealing portion 131 of the packing 130 can be elastically deformed so as to be bent with the fixed end (base end 131a) as a fulcrum.

  When the force in the opening direction applied to the valve body 120 in the opened state of FIG. 13 is eliminated and the valve body 120 moves upward along the axial direction by the magnetic force, the valve body-side clamping surface 122 of the valve body 120 becomes the packing 130. In close proximity to the second surface 133 of the sealing portion 131, the valve body side clamping surface 122 and the second surface 133 abut. As shown in FIG. 14, the distance between the second surface 133 and the valve element side clamping surface 122 at the distal end 131b of the sealing portion 131 is minimized. 134 first comes into contact with the valve-side clamping surface 122.

  When the valve body side clamping surface 122 moves further upward along the axial direction, as shown in FIG. 15, the sealing portion 131 is elastically deformed so as to tilt or bend toward the main body side clamping surface 115, and the sealing portion 131. The first surface 132 abuts on the body-side clamping surface 115 (or the protrusion 115a). In particular, the distal end portion of the first surface 132 of the sealing portion 131 pressed against the valve body side sandwiching surface 122 abuts on the body side sandwiching surface 115 prior to the other portion (before other portions), and the distal end portion of the sealing portion 131 Can be preferentially pinched. A gap 135 is formed on the proximal end side with respect to the contact portion of the sealing portion 131. At this time, since the elastic restoring force toward the valve body side clamping surface 122 is generated in the sealing portion 131, the valve body side clamping surface 122 is urged downward by the second surface 133. Therefore, a uniform force is not applied to the valve body, the moving direction is inclined from the axial direction, the valve shaft 123 is slightly inclined (insufficient accuracy), or the valve body side clamping surface 122 is slightly distorted (unevenness). Even if there is, the second surface 133 of the packing 130 may be elastically deformed along the shape of the valve-side clamping surface 122 and contact over the entire circumferential direction of the valve-side clamping surface 122. In this stage of FIG. 15, the packing 130 is tilted and deformed, but it is not yet crushed.

  In the state of FIG. 15, the main body side clamping surface 115 and the valve body side clamping surface 122 press the sealing portion 131 of the packing 130, whereby the first surface 132 comes into pressure contact with the main body side clamping surface 115 and the second surface 133 is The valve body side clamping surface 122 is in pressure contact. As the valve body 120 is tightly closed, the sealing part 131 is crushed so that the pressure contact area (or contact area) with the valve body side clamping part 122 gradually expands from the edge of the packing 130 (near the tip 131a). That is, since the distal end portion of the first surface 132 of the sealing portion 131 abuts prior to the body side clamping surface 115, the distal end portion of the sealing portion 131 is elastically deformed so as to be preferentially crushed, In the center, the pressure contact area (with both clamping parts) expands on both the distal end side and the proximal end side. At this time, the gap 135 becomes a space that allows elastic deformation to the proximal end side of the sealing portion 131, and the space (vent hole 110 a) on the distal end 131 b side of the sealing portion 131 moves to the distal end side of the sealing portion 131. It becomes the space which accepts elastic deformation. Therefore, according to the clamping pressure of the packing 130, the pressure contact region of the sealing portion 131 gradually expands to the proximal end side so as to retract the gap 135 toward the proximal end side, and the distal end portion of the sealing portion 131 gradually increases. We are pressed.

  As a result, as shown in FIG. 16, in a state where the valve body 120 is stationary, the sealing portion 131 is elastically deformed so as to be crushed compared to the original shape. Further, the ridge 115 a bites into the first surface 132 of the sealing portion 131. That is, when the sealing portion 131 is sandwiched between the main body side clamping surface 115 and the valve body side clamping surface 122, the meat portion of the sealing portion 131 is bordered on the (particularly strong) tip portion of the sealing portion 131. Is effectively crushed so as to escape into both the front end side space (vent hole 110a) and the rear end side space (gap 135). Although the gap 135 is significantly smaller than that in FIG. 15, the gap 135 may be completely eliminated. Accordingly, a sufficient contact area between the sealing portion 131 and the both sandwiching surfaces 115 and 122 is ensured, and the sealing portion 131 is efficiently in pressure contact with both the sandwiching surfaces 115 and 122. That is, in the closed state of the vent valve 100, the vent 110a is closed by the valve body 120 in a more reliable form.

  In addition, it is preferable that the inclination | tilt angle of the 1st surface 132 with respect to the main body side clamping surface 115 is about 0-10 degree | times. That is, as long as the main body side clamping surface 115 and the first surface 132 are separated from each other, they may be parallel to each other (the inclination angle is 0 degree). On the other hand, if the tilt angle is larger than 10 degrees, the gap 135 becomes too large, and there is a possibility that the contact area cannot be secured sufficiently. However, the above range is merely a preferred range, and the technical scope of the present invention is not limited to the above range. On the other hand, the inclination angle of the second surface 133 with respect to the valve-body-side clamping surface 122 is such that when the valve body 120 moves from the open position to the closed position, the distal end portion or the proximal end portion of the second surface 133 is part of the valve. It can be arbitrarily determined so as to be able to preferentially contact the body side clamping surface.

  Then, when the valve body 120 moves from the closed state of FIG. 16 to the open position of FIG. 13, the valve body side clamping surface 122 is separated from the second surface 133 of the sealing portion 131 of the packing 130, and the sealing portion 131 is The first surface 132 is separated from the body-side clamping surface 115 while returning to elasticity. At this time, the protruding portion 115 a formed to protrude from the main body side holding surface 115 acts to keep the first surface 132 of the sealing portion 131 away from the main body side holding surface 115. That is, the protrusion 115a prevents the sealing portion 131 from adhering to the main body side clamping surface 115, and when the valve body 120 moves from the closed position to the open position, the original shape of the sealing portion 131 is restored. Assists elastic recovery. It is preferable that the protruding portion 115a is formed so as to contact the distal end side from the center of the sealing portion 131. This is because if the protrusion 115a is disposed in the vicinity of the proximal end, the sealing portion 131 may not be reliably contacted. Since the protrusion 115a is mainly for elastically returning the sealing part 131 to the original shape, even if the protrusion 115a is omitted, the sealing part 131 is as shown in FIGS. Almost the same behavior can be taken.

  Hereinafter, the effect in the ventilation valve 100 of one Embodiment which concerns on this invention is demonstrated.

  According to the vent valve 100 of the present embodiment, the substantially straight first surface 132 of the sealing portion 131 has a main body side clamping surface 115 so that the distance from the main body side clamping surface 115 increases toward the tip. Separated from. Further, the substantially straight second surface 133 of the sealing portion 131 is inclined with respect to the valve body side clamping surface 122 so that the distance from the valve body side clamping surface 122 decreases toward the tip. That is, when the valve body 120 moves from the open position to the closed position and the valve body side clamping surface 122 contacts the sealing portion 131, the sealing portion 131 is elastically deformed so as to tilt toward the main body side clamping surface 122 side. . At this time, since the elastic restoring force toward the valve body side clamping surface 122 is generated in the sealing portion 131, the valve body side clamping surface 122 is opposite to the traveling direction of the valve body 120 by the second surface 133. Be energized. Therefore, the second surface 133 of the packing 130 is elastically deformed along the shape of the valve body side clamping surface 122 and can be more reliably contacted over the entire circumferential direction of the valve body side clamping surface 122. Further, when the valve body 120 moves from the open position toward the closed position, the distal end edge (front end portion) of the second surface 133 of the sealing portion 131 first comes into contact with the valve body side clamping surface 122 and is elastically deformed. Since the distal end portion of the first surface 132 of the stop portion 131 comes into contact with the main body side clamping surface 122, the distal end portion of the sealing portion 131 is elastically deformed so as to be preferentially crushed. At this time, the gap 135 formed on the proximal end side with respect to the distal end portion of the sealing portion 131 allows elastic deformation of the sealing portion 131 toward the proximal end 131a. As a result, the sealing portion 131 can be crushed so that the pressure contact region gradually increases from the distal end portion of the sealing portion 131 toward the base end 131a. Therefore, the sealing portion 131 can be more efficiently crushed by the main body side clamping surface 115 and the valve body side clamping surface 122, and the vent 110 a can be more reliably closed by the valve body 120.

[Modification]
The present invention is not limited to the above embodiment, and various modifications can be made. Hereinafter, modifications of the present invention will be described. Note that, in each modified example, components having the same last two digits in the components indicated by three digits have the same or similar features unless otherwise described, and a part of the description is omitted.

(1) The shape of the packing of this invention is not limited to the said embodiment. For example, the first surface and the second surface of the sealing portion of the packing need not be parallel. The ventilation valve 200 of FIG. 17 has a packing 230 having a shape different from that of the packing 130 of the above embodiment. The packing 230 is configured such that the tip side is thin. That is, the packing 230 extends from the fixing portion 238 fixed to the vent valve main body 210 and the base end 231a adjacent to the fixing portion 238 to the tip, and is sandwiched between the main body side holding surface 215 and the valve body side holding surface 222. And a sealing portion 231 that is elastically deformed. The sealing portion 231 has a first surface 232 that faces the main body side clamping surface 215 and a second surface 233 that faces the valve element side clamping surface 222. In a cross-sectional view cut along the radial direction of the original shape of the sealing portion 231, the first surface 232 and the second surface 233 of the sealing portion 231 have a substantially linear shape. When the valve body 220 is in the open position, the sealing portion 231 has the first surface 232 substantially parallel to the body-side clamping surface 215 and the second surface 233 and the valve body-side clamping surface 222 toward the tip. The second surface 233 is formed so as to incline with respect to the valve-side clamping surface 222 so that the distance between the two is small. In this mode, the tip portion of the second surface 233 of the sealing portion 231 first comes into contact with the valve body side clamping surface 222, so that the same effect as the vent valve 100 of the above embodiment can be exhibited.

(2) The shape of the packing of this invention is not limited to the said embodiment. For example, the corner may not be formed at the leading edge of the second surface of the sealing portion of the packing. A ventilation valve 300 in FIG. 18 includes a packing 330 having a shape different from that of the packing 130 of the above embodiment. The leading edge of the second surface 333 of the sealing portion 331 of the packing 330 is curved, and no corner is formed. However, even in such a configuration, the portion close to the tip of the second surface 333 of the sealing portion 331 (which is also included in the tip portion) first comes into contact with the valve body side clamping surface 322, so that The same quality effect as that of the vent valve 100 can be exhibited.

(3) In the said embodiment, the sealing part of packing is arrange | positioned so that the front-end | tip edge may substantially correspond or adjoin to the inner periphery of a main body side clamping surface. However, the front end edge of the sealing portion of the packing may extend radially inward from the end edge of the body-side clamping surface. In such a case, when the valve body moves to the open position, a portion where the sealing portion of the packing and the main body side clamping surface first come into contact is a portion on the proximal end side from the distal end edge. At this time, the first contact portion is defined as the “tip portion” even if the tip edge is not included. Or the front-end edge of the sealing part of packing may recede from the end edge of a main body side clamping surface to a base end side.

(4) In the embodiment described above, the first surface and the body-side clamping surface are separated by a predetermined distance at the proximal end of the sealing portion of the packing, but this is not an essential requirement in the present invention. That is, even if the first surface and the main body side holding surface are not separated from each other, if the first surface and the main body side holding surface are separated from each other so that the distance between the first surface and the main body side holding surface increases toward the tip, The problem of the present invention can be solved. In addition, when the first surface and the main body side holding surface are not separated from each other, when the sealing portion is elastically deformed and comes into contact with the main body side holding surface, the tip portion of the first surface of the sealing portion becomes the main body side holding surface. When contacted in advance, a gap may be formed between the first surface and the body-side clamping surface on the proximal side with respect to the distal end portion (although smaller than when the first surface and the body-side clamping surface are separated from each other).

(5) In the vent valve according to the present invention, the piping material is fixed to the cylindrical portion via the screw and the screw receiving portion, but is not limited to the configuration of the above embodiment. That is, a person skilled in the art can arbitrarily select the manner of fixing or mounting the vent valve to the piping material. For example, the peripheral wall of the ventilation valve may simply be fitted into the opening of the piping material.

(6) In this embodiment, the valve body of the vent valve is biased in the closing direction by the repulsive force of the magnet, but the present invention is not limited to this. For example, the biasing of the valve body may be performed by another mechanism such as a spring under the technical scope of the present invention.

(7) Although the vent valve of the present embodiment is configured as a circular opening provided with a vent hole at the center, the present invention is not limited to the above embodiment. For example, the technical idea of the present invention can be adopted even with a vent valve in which the shape of the vent and the valve body is annular (donut-shaped). That is, those skilled in the art can arbitrarily change or modify the configuration of the vent valve within the technical scope of the present invention.

  The present invention is not limited to the above-described embodiments and modifications, and can be implemented in various modes as long as they belong to the technical scope of the present invention. That is, a part of the configuration of the present embodiment may be omitted or modified, or another configuration may be added under the technical scope of the present invention.

10 Piping structure 11 Drainage pipe (pipe material)
12 Drainage pipe joint (piping material)
13 Tube 100 Ventilation valve (occlusion device)
110 Ventilation valve body (main body)
110a Vent 110b Connection 110c Valve body accommodating space 111 Peripheral wall 111a Groove 112 Upper wall 113 Standing wall 114 Screw receiving portion 115 Body side clamping surface 115a Projection portion 117 Body side magnet holding portion 117a Shaft hole 117b Body side magnet 118 Water stop Member 120 Valve body (blocking part)
121 Valve body main body 122 Valve body side clamping surface 123 Valve shaft 124 Valve body side magnet holding part 124a Valve body side magnet 130 Packing 131 Sealing part 131a Base end (fixed end)
131b Tip (free end)
132 First surface 133 Second surface 134 Corner 135 Clearance 138 Fixing part 140 Cover body 141 Connection hole 142 Notch part 143 Screw holding part 150 Screw

Claims (7)

A vent valve body having a vent;
A valve body movably supported by the vent valve main body so that the vent can be opened and closed;
The valve body is disposed between a body-side clamping surface provided at a peripheral edge of a vent inside the ventilation valve body and a valve-side clamping surface provided in the valve body so as to face the body-side clamping surface. A packing configured to seal the vent hole by being clamped by the main body side clamping surface and the valve body side clamping surface when moved to the closed position,
The packing extends from the proximal end adjacent to the stationary portion to the distal end, and is elastically deformed by being sandwiched between the body-side clamping surface and the valve body-side clamping surface. A sealing portion,
The sealing portion has a first surface facing the body-side clamping surface, and a second surface facing the valve body-side clamping surface,
In a cross-sectional view cut along the radial direction of the original shape of the sealing portion, when the valve body is in the open position, the second surface of the sealing portion has a substantially linear shape and faces the tip. The vent valve is inclined with respect to the valve body side clamping surface so that the distance between the valve body side clamping surface and the valve body side clamping surface decreases.   When the valve body moves from the open position to the closed position, the tip portion of the second surface of the sealing portion is configured to first abut against the valve body-side clamping surface. Item 2. The ventilation valve according to Item 1.   When the valve body moves from the open position toward the closed position, and the sealing portion is elastically deformed and comes into contact with the holding surface on the main body side, the tip portion of the first surface of the sealing portion is on the main body side. The ventilation according to claim 1 or 2, wherein a gap is formed between the first surface and the body-side clamping surface at a proximal end side with respect to the distal end portion and abutting prior to the clamping surface. valve.   The said main body side clamping surface and the said valve body side clamping surface which mutually oppose each are inclined with respect to the plane where the said vent hole extends, The Claim 1 characterized by the above-mentioned. Vent valve.   The said 1st surface of the said sealing part and the said main body side clamping surface are spaced apart by predetermined distance in the base end of the said sealing part, The Claim 1 characterized by the above-mentioned. Vent valve.   6. The ridge portion interposed between the sealing portion and the body-side clamping surface is provided on the body-side clamping surface so as to protrude. 6. Vent valve.   It is a piping structure where piping material was piped, Comprising: The vent valve as described in any one of Claim 1 to 6 is connected with the opening part of the said piping material so that the negative pressure in the said piping material may be eliminated. Piping structure characterized by that.

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