JP6861121B2 - Attachment and cylinder - Google Patents

Description

The present invention relates to an attachment body that is inserted into and attached to a tubular portion, a cylinder body to which an insertion body is inserted and attached, and a piping structure formed by the attachment body and the cylinder body.

Generally, drainage pipes are installed in drainage systems such as kitchen sinks, bathtubs, and toilets installed in buildings to treat wastewater. Such a drainage system piping structure includes a drainage pipe having a trap portion curved in an S-shape or a U-shape, and is configured to collect drainage in the trap portion. The residual drainage collected in this trap part blocks the inside of the drainage pipe to prevent the foul odor drifting from the downstream side of the drainage pipe from leaking into the room, and also prevents the invasion of pests creeping up from the downstream side of the drainage pipe. .. However, if the air pressure in the drain pipe drops to a negative pressure due to a large amount of water flowing through the drain pipe, the residual drainage in the trap portion may be sucked and flowed downstream. In order to prevent the water seal breakage in such a trap portion, a vent valve is arranged downstream of the trap portion of the drain pipe. Then, when the inside of the drain pipe becomes negative pressure, the outside air is sucked into the drain pipe through the ventilation valve to eliminate the negative pressure state of the drain pipe, thereby preventing the trap portion from breaking the water seal.

For example, Patent Document 1 discloses a vent valve capable of more quickly and surely relieving negative pressure in a piping material. Hereinafter, in the paragraph, the reference numerals of Patent Document 1 are shown in parentheses. The vent valve (100) is housed in a vent valve main body (110) connected to a drain pipe (P) and the vent valve main body (110), and a valve body (130) to which a first magnet (M1) is connected. To protect the second magnet holder (150) that holds the second magnet (M2) so as to be movable along the valve shaft (135) of the valve body (130) and the valve body (130). A cover body (170) attached to one end of the vent valve main body (110) is provided. Further, a circular vent (112) is formed which is opened and closed by the valve body (130). A valve seat (113) is provided on the lower end side so as to border the vent (112). The vent (112) is closed by the packing (132) of the valve body (130) coming into close contact with the valve seat (113). A connection port (119) for connecting to the connection end (P') of the drain pipe (P) is formed at the lower end of the vent valve main body (110). The vent valve (100) is attached to the drainage pipe (P) by fitting the inner cylinder wall (119a) of the connection port (119) into the connection end (P') of the drainage pipe (P). In the piping structure (10), when the negative pressure in the drain pipe (P) becomes large, a pressure difference occurs inside and outside the ventilation valve main body (110) via the valve body (130), and the pressure difference becomes the first magnet (1st magnet). When the repulsive force between the 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, the outside air is sucked through the vent (112). As a result, the negative pressure in the drain pipe (P) is eliminated.

Patent Document 2 discloses an intake valve device that can be installed in a small space. Hereinafter, in the paragraph, the reference numerals of Patent Document 2 are shown in parentheses. The intake valve device (1) is formed in a branch joint (6) connected to a drain pipe (5) through which drainage from the drainage fixture (3) flows, and a branch portion (15) of the branch joint (6). It is provided with an intake valve (7) housed in the intake valve fitting port (18). The intake valve 7 includes an intake valve main body (21) having a first tubular member (23) forming a lower portion and a second tubular member (24) forming an upper portion, and the inside of the intake valve main body (21). A valve body (22) that can be moved by the pressure difference between the pressure inside the drain pipe (5) and the outside air pressure is provided. Then, the fixing packing (38) is attached to the outer peripheral surface (25a) of the tubular body (25) of the first tubular member (23), and the first tubular member (23) and the second tubular member are attached. It is pressed in the width direction by (24). Therefore, the fixing packing (38) is deformed so as to project outward in the radial direction. The fixed packing (38) in this deformed state fixes the branch portion (15) and the intake valve main body (21) in a watertight manner while the intake valve main body (21) is housed in the branch portion (15).

Japanese Unexamined Patent Publication No. 2015-232369 Japanese Unexamined Patent Publication No. 2014-74483

Generally, a full water test is adopted to check the presence or absence of water leakage in the drainage piping material. This fullness test is performed by injecting water into the entire drainage system until it is full and applying a predetermined water pressure to the inside of the piping material. When the piping material has a tubular portion that communicates with the inside and outside of the tubular portion and the open end of the tubular portion is blocked by an attachment body such as a ventilation valve, the attachment body is used from the viewpoint of work efficiency and the like. It is desirable that the full water test be carried out in the attached state. However, when the full water test is carried out with the attachment body attached to the drain pipe, there is a risk that the attachment body will come out due to the water pressure and water will be ejected from the attachment body, and the full water test will fail. In particular, in the vent valve of Patent Document 1, since the tubular wall of the connection port is only fitted into the connection end of the drain pipe, it cannot withstand the water pressure at the time of the full water test, and the vent valve drains. It easily slips out of the connection end of the pipe. On the other hand, in Patent Document 2, since the intake valve is attached to the branch joint via the fixing packing, it is difficult to separate the two due to the frictional force. However, when the water pressure inside the piping material rises, the attachment by friction alone becomes insufficient, and as a result, there is a risk that the intake valve will come out of the drain pipe. In contrast to these conventional techniques, it is possible to adhere the attachment body to the drain pipe with an adhesive, but it takes time for the adhesive to cure and it is difficult to remove the attachment body once it is adhered. It is difficult to be adopted because there are various problems such as the fact that it becomes. That is, it is desirable that the attachment body (or the vent valve) can be quickly and easily attached and detached firmly to the tubular portion in order to withstand the full water test in the state where the attachment body (or the vent valve) is attached to the tubular portion.

The present invention has been made to solve the above problems, and an object of the present invention is an attachment body that can be firmly attached to and easily detached from the tubular portion, and an attachment body that can be easily detached from the tubular portion. It is an object of the present invention to provide a tubular body capable of being firmly inserted and attached to the insert body and easily detaching the insert body, and a piping structure using the attached body and the tubular body.

The attachment body according to claim 1 has a main body portion inserted from an opening end into a hollow tubular portion extending along a tubular shaft, and an outer surface of the main body portion so as to be in contact with the inner surface of the tubular portion. In a state where the main body is inserted into the tubular portion so as to project outward in the radial direction, the main body is engaged with the inner surface of the tubular portion so as to restrict the relative movement of the main body in the detachment direction along the tubular axis. A locking claw portion for stopping is provided, and in a locked state between the locking claw portion and the inner surface of the tubular portion, the main body portion opens due to the rotational movement of the main body portion around the tubular shaft. It is characterized in that it is configured to be displaced toward the end side.

The attachment body according to claim 2 is the attachment body according to claim 1, wherein the locking claw portion allows the relative movement of the main body portion along the cylinder axis in the insertion direction. It is a feature.

The attachment body according to claim 3 is the attachment body according to claim 2, wherein the locking claw portion extends so as to be inclined so that the tip thereof is located on the detachment direction side from the proximal end. At the same time, it is characterized in that it can be deformed so as to bend inward and outward in the radial direction.

The attachment body according to claim 4 is the attachment body according to any one of claims 1 to 3, and the tip of the locking claw portion can bite into the inner surface of the tubular portion. The tip blade is provided so that the end face of the tip blade facing outward in the radial direction approximately follows a virtual spiral curve centered on the cylinder axis in the circumferential direction with respect to the horizontal plane orthogonal to the cylinder axis. When the main body portion rotates in one direction or the other direction inside the tubular portion, the tip blade spirally scratches the inner surface of the tubular portion, and the main body portion has the tubular shape. It is characterized in that it can be displaced toward the open end side or the back side of the portion.

The attachment body according to claim 5 is the attachment body according to any one of claims 1 to 4, wherein the locking claw portion has the main body portion inserted into the tubular portion. In the above, the main body portion can be rotationally moved with a force weaker than the force required for moving the main body portion toward the opening end side along the tubular shaft, and the tubular shaft of the tubular portion is centered. It is characterized in that the force required for rotation in one direction and the force required for rotation in the other direction are different from each other.

In the attachment body according to claim 6, in the attachment body according to any one of claims 1 to 5, the base end portion of the claw member is held by the main body portion, and the tip end portion of the claw member is the base. It is characterized in that the locking claw portion is formed at the tip portion by bending and extending from the end portion.

The attachment body according to claim 7 is the attachment body according to any one of claims 1 to 6, wherein two or more locking claws are provided at intervals in the circumferential direction. It is a feature.

The attachment body according to claim 8 includes a main body portion inserted from an open end into a hollow tubular portion extending along a tubular shaft.
With the main body protruding from the outer surface of the main body so as to be in contact with the inner surface of the tubular portion and the main body being inserted into the tubular portion, the opening end side of the main body along the tubular axial direction. A locking claw portion that locks on the inner surface of the tubular portion so as to regulate relative movement to the tubular portion is provided.
The main body is provided with a tilting operation portion that tilts the locking claw portion in a separating direction with respect to the inner surface of the tubular portion.

The attachment body according to claim 9 is the attachment body according to claim 8, wherein the tilting operation portion tilts the locking claw portion, so that the attachment body is formed along the cylinder axis inside the tubular portion. The main body is allowed to move in the insertion direction and the detachment direction.

The attachment body according to claim 10 further includes a tilt regulation unit that regulates the tilt of the locking claw portion due to the free tilt of the tilt operation unit in the attachment body according to claim 8 or 9. It is a feature.

The attachment body according to claim 11 has vents and connection ports at both ends in the tubular axis direction so that the attachment body according to any one of claims 1 to 10 functions as a ventilation valve. The valve body is movably held in the valve body accommodating space between the vent and the connection port.

The piping structure according to claim 12 includes a tubular portion extending in the axial direction so as to form a communication passage that opens to the outside and communicates with the inside and outside of the piping system.
The attachment body according to any one of claims 1 to 11, which is inserted and attached to the tubular portion in order to close the communication passage.

The tubular body according to claim 13 has an open end into which an insert body is inserted, and has a hollow tubular portion extending along a tubular axis.
Inside the tubular portion, the tubular portion projects radially inward from the inner surface of the tubular portion so as to be in contact with the outer surface of the insert body, and is elastically deformed so as to allow the insert body to move in the insertion direction, and the tubular portion is elastically deformed. With the insert body inserted therein, a locking claw portion that locks the outer surface of the insert body so as to restrict the relative movement of the insert body toward the opening end side along the cylinder axis. Prepare,
In the locked state between the locking claw portion and the outer surface of the insert body, the insert body is configured to move relative to the opening end side by the rotational movement of the insert body around the cylinder axis. It is characterized by being.

The cylinder according to claim 14 is the cylinder according to claim 13, wherein the locking claw portion extends so as to be inclined so that the base end thereof is located closer to the opening end side than the tip end. At the same time, it can be deformed so as to bend inward and outward in the radial direction.

The tubular body according to claim 15 is the tubular body according to claim 13 or 14, wherein a tip blade capable of biting into the outer surface of the insert body is provided at the tip of the locking claw portion and has a diameter. The end face of the tip blade facing inward in the direction is inclined in the circumferential direction with respect to the horizontal plane orthogonal to the cylinder axis so as to approximately follow a virtual spiral curve centered on the cylinder axis.
When the insert body rotates in one direction or the other direction inside the tubular portion, the tip blade spirally scratches the outer surface of the tubular portion, and the insert body is on the open end side of the tubular portion or. It is characterized in that it can be displaced to the back side.

The tubular body according to any one of claims 13 to 15, wherein the piping structure according to claim 16 forms a communication passage that opens to the outside and communicates with the inside and outside of the piping system.
It is characterized by including an insert body inserted and attached to the tubular portion of the tubular body so as to close the communication passage.

According to the attachment body according to claim 1, in a state where the main body portion is inserted into the tubular portion, the locking claw portion abuts on the inner surface of the tubular portion and is locked to the inner surface of the tubular portion. , The main body is restricted from moving relative to the opening end side (disengagement direction) of the tubular portion along the tubular axis. As a result, even if a force on the opening end side along the tubular shaft (assumed by water pressure, for example) is applied to the attachment body, the tubular portion is prevented from coming out of the tubular portion. And the attachment body are firmly connected. Further, the attachment body of the present invention is configured such that the main body portion is displaced toward the open end side by the rotational movement of the main body portion about the cylinder shaft. That is, the force suddenly applied to the attachment body attached to the tubular portion is generally assumed to be a linear force along the tubular shaft, but the locking claw portion and the inner surface of the tubular portion are assumed to be. It is effectively regulated that the main body portion moves relative to the opening end side of the tubular portion along the tubular shaft by the locked state with the above. On the other hand, by rotating the main body portion as necessary, the attachment body can be easily separated from the tubular portion without any difficulty. Therefore, the attachment body of the present invention can be firmly attached to the tubular portion and can be easily detached from the tubular portion.

According to the attachment body according to claim 2, in addition to the effect of the invention of claim 1, the main body portion of the locking claw portion moves toward the back side (insertion direction) of the tubular portion along the tubular axis. By allowing relative movement, the attachment body advances in the insertion direction inside the tubular part by simply pushing the main body part linearly along the tubular axis with respect to the tubular part, and the attachment body. Can be easily attached to the tubular part.

According to the attachment body according to claim 3, in addition to the effect of the invention of claim 1 or 2, the locking claw portion is the tip of the locking claw portion in the locked state between the locking claw portion and the inner surface of the tubular portion. Is inclined and extends so as to be located on the opening end side of the base end, and is configured to bend and deform in and out in the radial direction. As a result, when the attachment body is inserted into the tubular portion and a force is applied to the main body portion on the opening end side of the tubular portion, the locking claw portion is deformed so as to bend outward. The contact of the claw portion with the inner surface of the tubular portion becomes stronger, and the locking force of the locking claw portion becomes stronger. On the other hand, when the attachment body is inserted into the tubular portion, when the main body portion is moved in the insertion direction of the tubular portion, the locking claw portion is deformed so as to bend inward, so that the locking force due to the locking claw portion is obtained. Is hardly exhibited, and the attachment body can be easily moved in the insertion direction inside the tubular portion.

According to the attachment body according to claim 4, in addition to the effect of the invention according to any one of claims 1 to 3, the tip blade of the locking claw portion bites into the inner surface of the tubular portion, whereby the locking claw portion is formed. Can effectively lock the tubular portion. Further, the end face of the tip blade is inclined in a direction approximately along a virtual spiral curve centered on the cylinder axis. As a result, the main body rotates in one direction or the other direction inside the tubular part, so that the tip blade spirally damages the inner surface of the tubular part, in other words, the main body opens while carving a screw groove. It can be displaced to the end side or the back side (opposite the end of the opening).

According to the attachment body according to claim 5, in a state where the main body portion is inserted into the tubular portion, the force is weaker than the force required for moving the main body portion toward the opening end side along the tubular axis. Since the main body can be rotated and moved, the main body can be easily displaced in the detaching direction. Further, the force required for rotation of the tubular portion in one direction around the tubular axis and the force required for rotation in the other direction are different, so that the main body portion is displaced in the insertion direction. It becomes easy to distinguish between the rotation direction and the rotation direction in which the displacement is made in the detaching direction.

According to the attachment body according to claim 6, in addition to the effect of the invention according to any one of claims 1 to 5, the locking claw portion is easily attached to the main body portion via the base end portion of the claw member. Is possible.

According to the attachment body according to claim 7, in addition to the effect of the invention according to any one of claims 1 to 6, a plurality of locking claw portions cooperate to strengthen the attachment body by a tubular portion. Can be connected to.

According to the attachment body according to claim 8, in a state where the main body portion is inserted into the tubular portion, the locking claw portion abuts on the inner surface of the tubular portion and is locked to the inner surface of the tubular portion. , The main body is restricted from moving relative to the opening end side (disengagement direction) of the tubular portion along the tubular axis. As a result, even if a force on the opening end side along the tubular shaft (assumed by water pressure, for example) is applied to the attachment body, the tubular portion is prevented from coming out of the tubular portion. And the attachment body are firmly connected. Further, the attachment body of the present invention is configured such that the locking claw portion is tilted in the separating direction by the tilting operation portion. That is, the force suddenly applied to the attachment body attached to the tubular portion is generally assumed to be a linear force along the tubular shaft, but the locking claw portion and the inner surface of the tubular portion are assumed to be. It is effectively regulated that the main body portion moves relative to the opening end side of the tubular portion along the tubular shaft by the locked state with the above. On the other hand, by operating the tilting operation portion as necessary, the locking claw portion can be separated from the inner surface of the tubular portion, and the attachment body can be easily separated from the tubular portion without any difficulty. it can. Therefore, the attachment body of the present invention can be firmly attached to the tubular portion and can be easily detached from the tubular portion.

According to the attachment body according to claim 9, in addition to the effect of the invention of claim 8, by tilting the locking claw portion by the tilting operation portion, the main body portion of the locking claw portion becomes a tubular shaft. Since it is allowed to move relative to the inner side (insertion direction) of the tubular portion along the tubular portion, the attachment body can be easily pushed by simply pushing the main body portion linearly along the tubular axis with respect to the tubular portion. It advances in the insertion direction inside the tubular portion, and the attachment body can be easily attached to the tubular portion.

According to the attachment body according to claim 10, in addition to the effect of the invention of claim 8 or 9, the attachment body is restricted from free tilting of the locking claw portion in the separation direction by the tilt regulation portion. Can be prevented from suddenly detaching from the tubular portion.

According to the attachment body according to claim 11, in addition to the effect of the invention according to any one of claims 1 to 10, the attachment body can function as a vent valve.

According to the piping structure according to claim 12, the effect of the invention of the attachment body according to any one of claims 1 to 10 can be comprehensively exhibited as a piping structure.

According to the cylinder according to claim 13, in a state where the insert body is inserted into the tubular portion, the locking claw portion abuts on the outer surface of the insert body to lock the outer surface of the insert body, whereby the insert body is formed. It is restricted to move relative to the opening end side (disengagement direction) of the tubular portion along the tubular axis. As a result, even if a force on the opening end side along the cylinder axis (assumed by water pressure, for example) is applied to the insert body, the cylinder body and the insert body are prevented from coming out of the tubular portion. Is firmly connected. Further, the tubular body of the present invention is configured such that the insert body is displaced toward the open end side by the rotational movement of the insert body about the cylinder axis. That is, the force suddenly applied to the insert body mounted on the tubular portion is generally assumed to be a linear force along the tubular axis, but the locking claw portion and the outer surface of the insert body The locked state effectively regulates the relative movement of the insert along the tubular axis toward the open end side of the tubular portion. On the other hand, by rotating the insert body as needed, the insert body can be easily separated from the tubular portion without any difficulty. Therefore, the tubular body of the present invention can firmly hold the insert body and can easily separate the insert body from the tubular portion.

According to the cylinder according to claim 14, in addition to the effect of the invention of claim 13, the base end of the locking claw portion is closer to the tip in the locked state between the locking claw portion and the outer surface of the insertion body. Is inclined and extends so as to be located on the opening end side, and is configured to bend and deform in and out in the radial direction. As a result, when a force is applied to the insert body on the opening end side of the tubular portion while the insert body is inserted into the tubular portion, the locking claw portion is deformed so as to bend inward (protruding direction). As a result, the contact of the locking claw portion with the outer surface of the insertion body becomes stronger, and the locking force of the locking claw portion becomes stronger. On the other hand, when the insert body is inserted into the tubular portion, when the insert body is moved in the insertion direction of the tubular portion, the locking claw portion is deformed so as to bend outward (backward direction), so that the locking claw portion causes it. Almost no locking force is exerted, and the insert can easily move in the insertion direction inside the tubular portion.

According to the cylinder according to claim 15, in addition to the effect of the invention of claim 13 or 14, the tip blade of the locking claw portion bites into the outer surface of the insertion body, so that the locking claw portion has the effect of the insertion body. Can be locked. Further, the end face of the tip blade is inclined in a direction approximately along a virtual spiral curve centered on the cylinder axis. As a result, the insert body rotates in one direction or the other direction inside the tubular portion, so that the tip blade spirally damages the outer surface of the insert body, in other words, the insert body cuts a screw groove and the insert body opens. It can be displaced to the side or the back (opposite the opening end).

According to the piping structure according to claim 16, the effect of the invention of the tubular body according to any one of claims 13 to 15 can be comprehensively exhibited as a piping structure.

A perspective view from above (a) and a perspective view from below (b) of the ventilation valve of one embodiment (first embodiment) according to the attachment body of the present invention. 1 (a) plan view, (b) front view, (c) side view and (d) bottom view of the vent valve of FIG. 1 (a) plan view, (b) front view, (c) side view and (d) bottom view of the vent valve of FIG. 1 with the lid removed. A cross-sectional view taken along the line AA of the vent valve of FIG. BB sectional view of the vent valve of FIG. FIG. 2 is a cross-sectional view taken along the line CC of the vent valve of FIG. (A) Partially enlarged front view and (b) Partially enlarged side view of the vent valve of FIG. FIG. 3 is a perspective view of a claw member forming the locking claw portion of FIG. An exploded perspective view of the vent valve of FIG. An exploded perspective view of a piping structure of an embodiment (first embodiment) according to the present invention. FIG. 3 is a schematic cross-sectional view of a state in which the communication passage is closed in the piping structure of one embodiment (first embodiment) according to the present invention. FIG. 3 is a schematic cross-sectional view of a piping structure of an embodiment (first embodiment) according to the present invention in a state where the communication passages are open. FIG. 6 is a schematic cross-sectional view showing one step for constructing the piping structure of one embodiment (first embodiment) according to the present invention. FIG. 6 is a schematic cross-sectional view showing one step for disassembling the piping structure of one embodiment (first embodiment) according to the present invention. A perspective view from above (a) and a perspective view from below (b) of the ventilation valve of another embodiment (second embodiment) according to the attachment body of the present invention. (A) front view and (b) side view of the vent valve of FIG. The front view (a) and the side view (b) of the ventilation valve of FIG. 15 with the lid removed. FIG. 6 is a schematic view showing a state in which the tilting operation unit is operated in the ventilation valve of FIG. The schematic sectional view of the piping structure of another embodiment (second embodiment) which concerns on this invention. FIG. 6 is a schematic cross-sectional view showing one step for constructing or disassembling the piping structure of one embodiment (second embodiment) according to the present invention. The exploded perspective view of the piping structure provided with the cylinder of the embodiment (third embodiment) which concerns on the cylinder of this invention. FIG. 2 is a schematic cross-sectional view cut along the radial direction of the cylinder of FIG. 21. FIG. 2 is a schematic cross-sectional view of the piping structure of FIG. The figure which shows the modification of one Embodiment which concerns on the attachment body or the piping structure of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The shapes of the figures referred to in the following description are conceptual diagrams or schematic views for explaining suitable shape dimensions, and the dimensional ratios and the like do not always match the actual dimensional ratios. That is, the present invention is not limited to the dimensional ratio in the drawings. Further, it goes without saying that the vertical and horizontal directions in the present invention are merely concepts indicating relative positions, and these can be interchanged and applied.

[First Embodiment]
The piping structure 10 of one embodiment of the present embodiment is a drainage system piping structure in which a drainage pipe (piping material) is arranged. The piping structure 10 is provided with a hollow tubular portion 13 that opens to the outside to form a communication passage that communicates with the inside and outside of the piping material 11, and the opening of the tubular portion 13 is provided to close the communication passage. A vent valve 100 is attached to the (see FIG. 10). In the present embodiment, the vent valve 100 is used as the "attachment body" in order to eliminate the negative pressure of the drainage system. However, it goes without saying that the present embodiment is merely an example of the present invention and does not limit its use and configuration. Hereinafter, the configuration of the vent valve 100 will be described as the first embodiment of the attachment body of the present invention with reference to the drawings.

1 (a) and 1 (b) are perspective views of a vent valve 100 according to an embodiment of the present invention. 2 (a) to 2 (d) are a plan view, a front view, a side view, and a bottom view of the vent valve 100. 3A to 3D are a plan view, a front view, a side view, and a bottom view of the ventilation valve 100 in which the cover body 130 is omitted for convenience of explanation. FIG. 4 is a cross-sectional view taken along the line AA of the vent valve 100. 5 and 6 are a BB cross-sectional view and a CC cross-sectional view cut along the radial direction of the vent valve 100.

The ventilation valve 100 is fixed to the opening of the cylindrical tubular portion of the piping material, and is configured to selectively close and communicate the communication passage according to the pressure fluctuation in the piping material. As shown in FIGS. 1 and 2, the vent valve 100 is movably supported by the vent valve main body (main body portion) 110 attached to the opening of the piping material and the vent valve main body 110 in the tubular axial direction. A valve body 120 and a cover body 130 attached to an end portion of the ventilation valve main body 110 on the ventilation hole 110a side so as to protect the valve body 120 are provided.

The vent valve main body 110 has a cylindrical shape extending along the cylindrical axial direction while having both ends open. That is, the ventilation valve main body 110 has a ventilation port 110a at the upper end (outside side of the piping material) for taking in outside air into the piping material, and a connection port connected to the piping material at the lower end (inside side of the piping material). It has 110b. The vent 110a and the connection 110b extend parallel to the horizontal plane orthogonal to the cylinder axis. Then, a valve body accommodating space 110c for movably accommodating the valve body 120 is provided in a space arranged side by side along the tubular axis between the vent port 110a and the connection port 110b of the vent valve main body 110. There is.

Further, the ventilation valve main body 110 stands from the peripheral wall 111 surrounding the valve body accommodating space 110c, the upper wall 112 which is connected to the upper end of the peripheral wall 111 and forms the opening peripheral surface of the ventilation port 110a, and the upper wall 112. It is provided with the provided vertical wall 113.

The peripheral wall 111 has an outer peripheral surface that is inserted into the tubular portion of the piping material and extends in the tubular axial direction along the inner peripheral surface of the tubular portion. Further, a connecting port 110b facing downward is formed by the opening end surface on the lower side of the peripheral wall 111. Then, as shown in FIGS. 5 and 6, a concave groove 111a extending in the circumferential direction is formed in the vicinity of the connection port 110b of the peripheral wall 111. A water blocking member 118 made of annular rubber is housed in the recessed groove 111a. The water blocking member 118 slightly protrudes from the outer peripheral surface of the peripheral wall 111, and when the ventilation valve 100 is attached, the water blocking member 118 is crushed and adhered to the inner peripheral surface of the tubular portion of the piping material, and between the ventilation valve main body 110 and the piping material. It works to stop the water.

The upper wall 112 extends in a ring band shape so as to face upward around the vent 110a that opens with a predetermined diameter. Further, a main body side holding surface 115 is provided on the periphery of the vent 110a inside the vent valve main body 110 of the upper wall 112. That is, as shown in FIGS. 5 and 6, an annular band-shaped holding surface 115 on the main body side is defined on the opening peripheral surface of the upper wall 112 inside the vent valve main body 110 so as to face the valve body 120. .. In cross-sectional view, the main body side holding surface 115 is inclined so that the outer peripheral side is lowered with respect to the tubular axis direction and extends in a straight line, and faces diagonally downward (inward in the radial direction and downward in the tubular axis direction). ..

Further, as shown in FIGS. 3 and 4, three beam-shaped portions 112a extending toward the center in the radial direction are formed on the upper surface of the upper wall 112 at equal intervals. The main body side magnet holding portion 117 is supported at the center of the vent 110a by these beam-shaped portions 112a. Further, as shown in FIGS. 5 and 6, the main body side magnet holding portion 117 is provided with a shaft hole 117a that penetrates vertically and inserts the valve shaft 123 of the valve body 120. Then, in the main body side magnet holding portion 117, the annular main body side magnet 117b is fitted and held in the 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 act a repulsive force on the valve body side magnet 124a described later.

The standing walls 113 are erected in pairs so as to face each other from substantially the center in the radial direction of the upper wall 111. The pair of standing walls 113 have an arc shape so that a concave curved surface is directed inward in the radial direction in a 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 vertical wall 113 are located on concentric circles (of different diameters). More specifically, the tip end side portion of the outer surface of the vertical wall 113 is located at a position retracted radially inward from the outer peripheral surface of the peripheral wall 111, and the base end portion is thick so as to be continuous with the outer peripheral surface of the peripheral wall 111. A holding portion 113b for holding the locking claw portion 114 is formed as a rib. The thick-walled holding portion 113b suppresses the vertical wall 113 from bending and deforming. A step is formed between the outer surface of the vertical wall 113 and the holding portion 113b. A slit 113c (see FIG. 6 or 9) for inserting the locking claw portion 114 is opened on the upper surface of the holding portion 113b. The locking claws 114 are provided on the holding portions 113b of the pair of standing walls 113 so as to project outward in the radial direction through the slits 113c.

7 (a) and 7 (b) are a partially enlarged front view and a side view of the locking claw portion 114 of the ventilation valve 100 of the present embodiment. In this embodiment, two locking claws 114 are provided at intervals in the circumferential direction. The locking claw portion 114 has a length capable of contacting the inner surface of the tubular portion 13 (in which the vent valve 100 is inserted), and is radially outside the outer surface of the vent valve main body 110 to the peripheral wall 111 and the outer peripheral surface of the packing 116. It protrudes into.

FIG. 8 is an overall perspective view of the claw portion member 114A constituting the locking claw portion 114. As shown in FIG. 8, the claw member 114A is made by refracting a thin metal plate, and occupies a base end portion held by the vent valve main body 110 and a tip end portion that bends and extends from the base end portion. It is composed of a claw portion 114. The claw member 114A can be elastically deformed so as to be further bent in both directions with the bent portion as an axis. Further, a tip blade 114a capable of biting into the inner surface of the tubular portion 13 is provided at the tip of the locking claw portion 114. The tip blade 114a is capable of cutting a hard resin material and is sharp to some extent. In the present embodiment, an arcuate recess is formed substantially in the center of the end surface of the tip blade 114a, and sharp cutting edges extend linearly on both sides of the recess. Both edges (corner portions) in the circumferential direction of the end surface of the tip blade 114a are sufficiently sharp so that the inner surface of the tubular portion 13 in contact with the tip blade 114a can be cut in the circumferential direction. Further, in order to change the ease of rotation inside the tubular portion 13 of the vent valve main body 110 according to the rotation direction of the vent valve main body 110, a difference in sharpness may be provided between both edges. However, the shape of the tip blade 114a is not limited to this embodiment and can be formed arbitrarily. On the other hand, a holding piece 114b bent inward in the radial direction is formed at the base end portion of the claw member 114A. As shown in FIG. 6, the base end portion of the claw member 114A is inserted into the slit 113c formed on the upper surface of the holding portion 113b, and the holding piece 114a of the locking claw portion 114 comes into contact with the meat portion of the vent valve main body 110. As a result, the claw member 114A is held by the holding portion 113b of the vent valve main body 110 to prevent it from coming off.

As shown in the front view of FIG. 7A, the locking claw portion 114 (tip portion of the claw member 114A) extends diagonally upward in the radial direction, and the tip blade 114a faces outward in the radial direction. There is. In other words, the locking claw portion 114 is tilted (relative to a horizontal plane orthogonal to the cylinder axis) so that its tip is located on the detachment direction side from the proximal end in a cross-sectional view cut along the radial direction. It is postponed. The locking claw portion 114 can be elastically deformed so as to bend in and out in the radial direction like a leaf spring. According to the structure of the locking claw portion 114, when a downward (backward) force is applied to the tip blade 114a, the locking claw portion 114 is elastic so that the tip blade 114a is displaced outward in the radial direction. On the other hand, when a force upward (open end side) is applied to the locking claw portion 114, the locking claw portion 114 is elastically deformed so that the tip blade 114a is displaced inward in the radial direction. That is, as will be described later, the locking claw portion 114 allows the vent valve main body 110 to move relative to the tubular portion 13 in the insertion direction, and the vent valve main body 110 is inserted into the tubular portion 13. The vent valve main body 110 is configured to be locked to the inner surface of the tubular portion 13 so as to regulate the relative movement of the vent valve main body 110 in the detaching direction along the tubular axis.

As shown in the side view (front view of the tip blade 114a) of FIG. 7B, the upper surface of the holding portion 113b of the vertical wall 113 is inclined in the circumferential direction, and the locking claw portion 114 extends from the inclined upper surface. ing. Then, in the circumferential direction with respect to the horizontal plane orthogonal to the tubular axis, the end surface of the tip blade 114a facing the radial outer side of the locking claw portion 114 substantially follows a virtual spiral curve centered on the tubular axis. It is inclined. That is, in FIG. 7B, the tip blade 114a is in an inclined posture so that the right end side of the end surface of the tip blade 114a extending in a straight line is raised. All of the plurality of locking claws 114 are inclined in the same spiral direction and at the same angle so that the tip blades 114a of the plurality of (two in the present embodiment) locking claws 114 cooperate like a screw thread. It is configured as follows. The inclination angle is preferably set to about 45 degrees or less with respect to the horizontal direction, but can be arbitrarily set within a range that functions like a screw thread. In this embodiment, the inclination angle is 5 degrees. According to the structure of the locking claw portion 114, when the ventilation valve 100 rotates about its central axis (cylindrical axis), the tip blade 114a of the locking claw portion 114 moves in a spiral manner. That is, as will be described later, when the vent valve main body 110 rotates in one direction or the other direction inside the tubular portion 13, the tip blade 114a spirally damages the inner surface of the tubular portion 13 while the vent valve main body 110 Can be displaced toward the open end side or the back side of the tubular portion 13. The locking claw portion 114 has a force weaker than the force required to move the vent valve main body 110 toward the opening end side along the tubular axis in a state where the vent valve main body 110 is inserted into the tubular portion 13. The vent valve main body 110 can be rotationally moved, and the force required for rotation of the tubular portion 13 in one direction around the tubular axis is different from the force required for rotation in the other direction. It is configured.

Then, as shown in FIGS. 5 and 6, a packing 116 is attached to the inside of the ventilation valve main body 110 so as to cover the main body side holding surface 115. The packing 116 is an annular body made of elastically deformable rubber or soft synthetic resin having an opening in the center.

The valve body 120 is housed in the valve body accommodating space 110c of the vent valve main body 110, and is supported by the vent valve main body 110 so as to move along the tubular axis direction. The valve body 120 includes a valve body 121 formed in a circular cup shape in a plan view, a valve shaft 123 extending upward from the center of the valve body 121, and a valve body side magnet formed at the upper end of the valve shaft 123. It is provided with a holding unit 124.

A valve body side holding surface 122 is formed on the upper surface of the valve body main body 121 on the outer peripheral side. As shown in FIGS. 5 and 6, the valve body side sandwiching surface 122 is inclined and extends in a straight line so that the outer peripheral side is lowered with respect to the tubular axis direction in a cross-sectional view cut along the radial direction, and is oblique. It faces upward (outer in the radial direction and upper in the tubular axis). That is, the valve body side holding surface 122 faces the main body side holding surface 115 of the ventilation valve main body 110 with the packing 116 interposed therebetween. The vent 110a is inclined with respect to the extending plane so that the valve body side holding surface 122 and the main body side holding surface 115 are substantially parallel to each other.

As shown in FIGS. 4 to 6, the valve shaft 123 is arranged on the central axis of the ventilation port 110a and penetrates the shaft hole 117a of the main body side magnet holding portion 117 of the ventilation valve main body 110. A valve body side magnet holding portion 124 is provided at the upper end of the valve shaft 123, which is located above the main body side magnet holding portion 117 and has a diameter larger than the diameter of the shaft hole 117a. The valve body side magnet holding portion 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 magnet 124a is 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. Then, 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 to float upward by the magnetic force. As a result, the valve body side holding surface 122 of the valve body main body 121 is pressed against the packing 116 to close the vent 110a. On the other hand, when a downward force exceeding the magnetic force is applied to the valve body 120 (generally when the inside of the piping material becomes negative pressure), the valve body 120 moves downward along the tubular axis direction. Then, the valve body side holding surface 122 is separated from the packing 116, 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 tubular axis direction is stably guided by the main body side magnet holding portion 117.

The cover body 130 is configured to cover the inside of the vent valve main body 110 and the vent body 120 from above in order to protect or protect the valve body 120 from dust. The cover body 130 has a circular shape in a plan view. Two slit-shaped connecting holes 131 are formed on the outer peripheral side of the cover body 130. Further, two notches 132 are formed on the outer peripheral edge of the cover body 130 in the radial direction of the two connecting holes 131, respectively, in a substantially rectangular shape in a plan view. Then, by fitting the connecting piece 113a of the ventilation valve main body 110 into the connecting hole 131, the cover body 130 is detachably fitted to the ventilation valve main body 110.

FIG. 9 is an exploded perspective view of the vent valve 100 of the present embodiment. As shown in FIG. 9, the vent valve main body 100 is formed by combining the upper split body 110-1 and the lower split body 110-2. The upper split body 110-1 has a female threaded portion at the lower end, the lower split body 110-2 has a male threaded portion at the upper end, and the upper split body 110-1 and the lower split body 110-2 can be screwed together. Is. Then, the packing 116 is sandwiched between the upper division body 110-1 and the lower division body 110-2, and the upper division body 110-1 and the lower division body 110-2 are screwed together to form an outer circumference of the packing 116. The vent valve body 110 is constructed by fixing the side portions so as to be embedded in the wall. Further, the locking claw portion 114 can be provided in the vent valve main body 110 by inserting the base end portion of the claw member 114A into the slit 113c of the holding portion 113b of the vent valve main body 110. Further, the valve shaft 123 of the valve body 120 is inserted into the shaft hole 117a of the ventilation valve main body 110 from below, and the valve body side magnet holding portion 124 is screwed or adhered to the upper end of the valve shaft 123, whereby the valve body 120 is formed. It is supported by the vent valve main body 110 to prevent it from falling off. Then, by inserting the connecting piece 113a extending upward from the tip of the standing wall 113 of the vent valve main body 110 into the connecting hole 131 of the cover body 130, the cover body 130 is detachably fitted to the vent valve main body 110. To. In this way, the vent valve 100 is constructed. The upper split body 110-1, the lower split body 110-2, the valve body 120, and the cover body 130 of the present embodiment are formed by molding a hard synthetic resin material, but the present invention is not limited thereto. Those skilled in the art can arbitrarily select the material.

Next, the piping structure 10 of the present embodiment will be described. FIG. 10 is an exploded perspective view of the piping structure 10. As shown in FIG. 10, in the present embodiment, two drainage pipes 11 are connected via a drainage pipe joint 12 branched in three directions. The drainage pipe joint 12 has three connection ports, two drainage pipes 11 are connected to the two connection ports, and one connection port is opened upward. That is, the drainage pipe joint 12 (a type of drainage pipe) extends along the cylinder axis so as to open to the outside and form a communication passage that communicates with the inside and outside of the piping material (drainage pipe 11 or drainage system). A hollow tubular portion 13 is provided. A vent valve 100 is attached to the hollow tubular portion 13 as an attachment body in order to selectively close the communication passage.

FIG. 11 is a cross-sectional view of the piping structure 10 in which the vent valve 100 is fixed to the tubular portion 13. As shown in FIG. 11, in the piping structure 10, the peripheral wall 111 of the vent valve main body 110 is completely inserted into the tubular portion 13 until the lower end surface of the peripheral wall 111 comes into contact with the step of the reduced diameter portion of the tubular portion 13. , The water blocking member 118 seals between the outer surface of the peripheral wall 111 and the inner surface of the tubular portion 13. At this time, since the water stop member 118 is arranged on the back side of the locking claw portion 114, the water stop member 118 is sealed at a portion on the inner surface of the tubular portion 13 where the locking claw portion 114 is not damaged. Can be (watertight and airtight).

As shown in FIG. 11, a pair of locking claw portions 114 extend to the outside of the peripheral wall 111, and the tip blade 114a abuts on the inner surface of the tubular portion 13 and bites into the tubular portion 13. As a result, the locking claw portion 114 is locked to the inner surface of the tubular portion 13 so as to restrict the relative movement of the vent valve main body 110 and the tubular portion 13 in the detaching direction along the tubular axis. More specifically, the locking claw portion 114 is inclined and extends so that the tip thereof is located on the opening end side of the base end in the locked state between the tip blade 114a and the inner surface of the tubular portion 13. At the same time, it is configured to bend and deform in and out in the radial direction. Therefore, when a force on the open end side of the tubular portion 13 is applied to the vent valve main body 110, a downward force acts on the tip blade 114a, and the locking claw portion 114 is elastically deformed so as to expand outward. As a result, the contact (bite) of the tip blade 114a with respect to the inner surface of the tubular portion 13 becomes stronger, and the locking force of the locking claw portion 114 becomes stronger. That is, the inclined locking claw portion 114 effectively prevents the vent valve 100 from moving in the detaching direction along the tubular shaft so as to come out of the tubular portion 13. Therefore, in the piping structure 10 of the present embodiment, the ventilation valve 100 is firmly fixed to the tubular portion 13 so as to withstand the water pressure in the full water test.

Further, in FIG. 11, the inside of the drain pipe 11 of the piping structure 10 is normal pressure or positive pressure, the valve body 120 of the ventilation valve 100 seals the ventilation port 110a, and the ventilation valve 100 communicates with the inside and outside of the drain pipe 11. The communication passage is blocked. Then, the water blocking member 118 is pressed against the inner peripheral surface of the tubular portion 13 and crushed, and the outer peripheral surface of the peripheral wall 111 of the ventilation valve main body 110 and the inner peripheral surface of the tubular portion 13 are stopped. As described above, in the closed state where the drain pipe 11 is not negative pressure, the urging force due to the magnetic force exceeds the force in the opening direction acting on the valve body 120, and the valve body 120 constantly closes the vent 110a. Further, in the piping structure 10, the malodor drifting from the downstream side of the drainage pipe 11 is prevented from leaking into the room, and the invasion of pests creeping up from the downstream side of the drainage pipe 11 is also prevented.

Then, when the negative pressure in the drain pipe 11 increases from the steady closed state, the valve body accommodating space 110c in the ventilation valve main body 110 communicating with the drain pipe 11 also becomes a negative pressure. As a result, a pressure difference is generated inside and outside the vent valve main 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 acting on the valve body 120 in the opening direction exceeds the repulsive force between the magnets 117b and 124a, the valve body 120 starts moving toward the opening position along the tubular axis direction. As the valve body 120 moves, the valve body side magnet holding portion 124 moves closer to the main body side magnet holding portion 117 along the tubular axis direction. Then, as shown in FIG. 12, the valve body 120 reaches a sufficiently open open position, and the outside air is sucked through the vent 110a. When the valve body 120 is in the open position, the packing 116 is attached to the inside of the ventilation valve main body 110, so that the surface of the packing 116 is hardly exposed to the outside. That is, since the proportion of the packing exposed to the outside is very small as compared with the case where the packing is attached to the upper surface of the valve body body, the adhesion of sewage or the like to the packing 116 is effectively reduced. .. Further, in the open state, the magnet holding portion 117 on the main body side and the holding surface 122 on the valve body side are inclined obliquely from the tubular axis direction, so that an inclined ventilation path is formed and air flow becomes efficient. Further, since the packing 116 is attached to the ventilation valve main body 110 instead of the valve body 120, the valve body 120 becomes relatively lightweight. As a result, the operation of the valve body 120 becomes light, for example, the initial movement of the valve body 120 becomes faster, and the minute movement of the valve body 120 becomes possible. As a result, the negative pressure in the drain pipe 11 is more reliably and quickly eliminated.

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 valve body 120 is shown by the repulsive force of the main body side magnet holding portion 117 and the valve body side magnet holding portion 124. It returns to the closed position shown in 11.

Subsequently, with reference to FIGS. 13 and 14, a method of mounting the vent valve 100 of the present embodiment on the tubular portion 13 and a method of detaching the vent valve 100 from the tubular portion 13 will be described.

First, in order to attach the vent valve 100 to the tubular portion 13, the vent valve main body 110 is inserted into the tubular portion 13 so that the connection port 110b of the vent valve 100 communicates with the opening of the tubular portion 13. .. At this time, the central axis of the vent valve 100 and the central axis of the tubular portion 13 are matched. Then, by pushing the vent valve main body 110 into the inner side of the tubular portion 13, the vent valve 100 can be easily attached to the tubular portion 13. In particular, when the vent valve 100 is inserted into the tubular portion 13, when the vent valve main body 110 is moved in the insertion direction of the tubular portion 13, the tip blade 114a of the locking claw portion 114 hits the inner surface of the tubular portion 13. In contact with each other, an upward force acts on the tip portion 114a to elastically deform the locking claw portion 114 so as to bend inward in the radial direction. Due to this elastic deformation in the radial inward direction, the locking force of the locking claw portion 114 with respect to the inner surface of the tubular portion 13 is hardly exerted, and the tip portion 114a does not bite into the inner surface of the tubular portion 13 and is a vent valve. The main body 110 can be easily moved in the insertion direction inside the tubular portion 13. That is, the relative movement of the vent valve main body 110 into the tubular portion 13 in the insertion direction is allowed, and the vent valve main body 100 can be easily inserted into the tubular portion 13. Then, when the vent valve main body 110 is inserted all the way into the tubular portion 13 to stop the movement in the tubular axial direction, the elastic return force of the locking claw portion 114 causes the tip blade 114a to bite into the inner surface of the tubular portion 13. be able to. As a result, the ventilation valve 100 can be fixed to the tubular portion 13 to construct the piping structure 10.

Next, in order to disengage the vent valve 100 from the tubular portion 13, one direction of the vent valve main body 110 centered on the tubular shaft in the locked state between the locking claw portion 114 and the inner surface of the tubular portion 13 (this implementation). The ventilation valve main body 110 can be displaced toward the open end side of the tubular portion 13 by the rotation operation (counterclockwise in the form). At this time, since the circumferential edge of the tip blade 114a is sharp enough to cut the inner surface of the tubular portion 13, the force required to move the vent valve main body 110 toward the open end side along the tubular axis is sufficient. The vent valve body 110 can be rotated and moved with a weak force. In the present embodiment, the edge on the upper side (right side in FIG. 7B) of the tip blade 114a has better sharpness, so that it is necessary for rotation in one direction (counterclockwise side) about the cylinder axis. The force is less than the force required to rotate in the other direction (clockwise). When the ventilation valve main body 110 is rotated in the other direction (clockwise), the ventilation valve main body 110 is displaced toward the back side of the tubular portion 13. As a result, the operator can easily distinguish the rotation direction to be displaced in the detaching direction. Then, the vent valve main body 110 rotates in one direction inside the tubular portion 13, so that the end face of the tip blade 114a is inclined in a direction approximately along a virtual spiral curve centered on the tubular axis. As a result, the tip blade 114a spirally scratches the inner surface of the tubular portion 13 to carve a screw groove, and the vent valve main body 110 is displaced toward the open end side. Therefore, the operator can easily separate the vent valve 100 from the tubular portion 13 by rotating the vent valve main body 110 in one direction.

Hereinafter, the action and effect of the vent valve (attachment body) 100 of the embodiment according to the present invention will be described.

According to the ventilation valve 100 (piping structure 10) of the present embodiment, with the ventilation valve main body 110 inserted into the tubular portion 13, the locking claw portion 114 abuts on the inner surface of the tubular portion 13 so as to bite into the inner surface. By locking the inner surface of the tubular portion 13, the vent valve main body 110 is restricted from relatively moving along the tubular shaft toward the opening end side (disengagement direction) of the tubular portion 13. In particular, the locking claw portion 114 is configured to bite into the inner surface of the tubular portion 13 more strongly when a force in the detaching direction is applied to the tubular portion 13. As a result, even if a force on the open end side along the tubular shaft is applied to the vent valve 100, the tubular portion 13 and the vent valve 100 are strengthened so that the vent valve 100 does not come out of the tubular portion 13. Is connected to. Further, the vent valve 100 of the present embodiment is configured such that the vent valve main body 110 is displaced toward the open end side by the rotational movement of the vent valve main body 110 about the cylinder shaft. That is, the force suddenly applied to the vent valve 100 mounted on the tubular portion 13 is generally assumed to be a linear force along the tubular shaft, but the locking claw portion 114 and the tubular portion are formed. The locked state with the inner surface of the portion 13 effectively regulates the relative movement of the vent valve main body 110 along the tubular shaft toward the open end side of the tubular portion 13. On the other hand, by rotating the vent valve main body 110 as needed, the vent valve 100 can be easily separated from the tubular portion 13 without any difficulty. Therefore, the vent valve 100 of the present embodiment can be firmly attached to the tubular portion 13 and can be easily detached from the tubular portion 13. As a result, maintenance work related to the piping structure 10 such as inspection and replacement of the ventilation valve 100 becomes remarkably easy.

[Second Embodiment]
Next, with reference to FIGS. 15 to 20, the vent valve 200 of the second embodiment of the attachment body of the present invention and the piping structure 20 provided with the vent valve 200 will be described. The vent valve 200 includes a vent valve main body (main body) 210 attached to an opening of a piping material, a valve body 220 movably supported by the vent valve main body 210 in the axial direction, and the valve body 220. A cover body 230 attached to an end portion of the ventilation valve main body 210 on the ventilation hole 210a side is provided so as to protect the ventilation valve body 210. In the vent valve 200 of the second embodiment, the configuration of the locking claw portion 214 is different from the configuration of the first embodiment, but is common in other configurations. Then, the components having the same last two digits in the components represented by the three digits have the same or similar characteristics unless otherwise specified, and the description thereof will be partially omitted.

As shown in FIGS. 16 and 17, the vertical wall 213 of the vent valve main body 210 is not provided with a thick holding portion and extends with a uniform thickness. Therefore, the vertical wall 213 can be elastically bent and deformed inward in the radial direction. Then, as shown in FIG. 19, the locking claw portion 214 is inserted by inserting the claw member 314A (having a shape and structure similar to that of the claw member 114A in FIG. 8) into the slit 313c formed in the vertical wall 213. It is provided so as to project outward in the radial direction from the peripheral wall 211. Similar to the first embodiment, a sharp tip blade 214a that can bite into the inner surface of the tubular portion 23 is formed at the tip of the locking claw portion 214.

As shown in FIG. 17A, the locking claw portion 214 extends diagonally upward in the radial direction, and the tip blade 214a faces outward in the radial direction, as in the first embodiment. That is, the locking claw portion 214 is inclined and extended (with respect to the horizontal plane orthogonal to the cylinder axis) so that the tip thereof is located on the detachment direction side from the proximal end in the cross-sectional view cut along the radial direction. Exists. The locking claw portion 214 can be elastically deformed so as to bend in and out in the radial direction like a leaf spring. That is, the locking claw portion 214 allows the vent valve main body 210 to move relative to the tubular portion 23 in the insertion direction, and the vent valve main body 210 is inserted into the tubular portion 23. It is configured to be locked to the inner surface of the tubular portion 23 so as to regulate the relative movement of the 210 in the detaching direction along the tubular axis. On the other hand, as shown in FIG. 17B, the tip blade 214a of the locking claw portion 214 extends along a horizontal plane orthogonal to the cylinder axis in the circumferential direction, unlike the first embodiment.

Then, as shown in FIG. 18, the standing wall 213 holding the locking claw portion 214 is configured as a tilting operation portion that can be elastically bent and deformed inward in the radial direction. The tilting operation portion is defined as a portion that holds the posture of the locking claw portion 214 so as to be tiltable. In this way, by picking the pair of vertical walls 213 and operating the tilting operation unit so as to bring them close to each other, the locking claw portion 214 can be tilted and the tip blade 214a can be displaced so as to retract inward in the radial direction. it can. In other words, the ventilation valve main body 210 is provided with a tilting operation portion (standing wall 213) that tilts the locking claw portion 214 with respect to the inner surface of the tubular portion 23 in the separation direction, and the locking claw portion 214 is provided by the tilting operation portion. Tilts in the separating direction, so that the ventilation valve main body 210 can move along the tubular shaft to the opening end side and the back side of the tubular portion 23.

FIG. 19 is a schematic cross-sectional view of a piping structure 20 in which the ventilation valve 200 is attached to the tubular portion 23 of the drainage pipe joint 22 of the drainage pipe 21. As shown in FIG. 19, a pair of locking claw portions 214 extend to the outside of the peripheral wall 211, and the tip blade 214a abuts on the inner surface of the tubular portion 23 and bites into the tubular portion 23. As a result, the locking claw portion 214 is locked to the inner surface of the tubular portion 23 so as to restrict the relative movement of the vent valve main body 210 and the tubular portion 23 in the detaching direction along the tubular shaft. More specifically, the locking claw portion 214 is inclined and extends so that the tip thereof is located on the opening end side of the base end in the locked state between the tip blade 214a and the inner surface of the tubular portion 23. At the same time, it is configured to bend and deform in and out in the radial direction. Therefore, when a force on the open end side of the tubular portion 23 is applied to the vent valve main body 210, the locking claw portion 214 is elastically deformed so as to expand outward, so that the inner surface of the tubular portion 23 of the tip blade 214a is formed. The contact (bite) with respect to the object becomes stronger, and the locking force by the locking claw portion 214 becomes stronger. The cover body 230 attached to the standing wall 213 functions as a tilting regulating portion that regulates the free tilting of the locking claw portion 214 (standing wall 213). That is, the locking claw portion 214 effectively prevents the vent valve 200 from moving in the detaching direction along the tubular shaft so as to come out of the tubular portion 23. Therefore, in the piping structure 20 of the present embodiment, the ventilation valve 200 is firmly fixed to the tubular portion 23 so as to withstand the water pressure in the full water test.

Subsequently, a step of attaching the vent valve 200 to the tubular portion 23 or a step of detaching the vent valve 200 from the tubular portion 23 will be described. As shown in FIG. 20, these steps can be easily performed by operating the tilting operation unit (standing wall 213) from which the cover body 230 has been removed. Specifically, when the operator tilts the locking claw portion 214 by the tilting operation portion to maintain the state in which the tip blade 214a is retracted inward in the radial direction, the tip blade 214a is brought into contact with the inner surface of the tubular portion 23. Without or without locking them to each other, the vent valve main body 210 can be linearly and relatively moved in both the insertion direction and the detachment direction along the cylinder axis inside the tubular portion 23. Therefore, by operating the tilting operation unit, the vent valve main body 210 is inserted into the tubular portion 23, the vent valve main body 210 is pushed into the inner side of the tubular portion 23 in the insertion direction, and the vent valve 200 is tubular. It can be easily attached to the portion 23. As in the first embodiment, by pushing the vent valve main body 210 into the inner side of the tubular portion 23, the locking claw portion 214 is bent inward in the radial direction, and the vent valve 200 is brought into the tubular portion 23. It may be attached. On the other hand, in the piping structure 20, by removing the cover body 230 and then operating the tilting operation unit, the ventilation valve main body 210 is moved in the detaching direction, and the ventilation valve 200 is easily detached from the tubular portion 23. Can be done.

That is, according to the ventilation valve 200 (piping structure 20) of the present embodiment, the locking claw portion 214 bites into the inner surface of the tubular portion 23 in a state where the ventilation valve main body 210 is inserted into the tubular portion 23. By abutting and locking to the inner surface of the tubular portion 23, the vent valve main body 210 is restricted from relatively moving along the tubular shaft toward the open end side (disengagement direction) of the tubular portion 23. In particular, the locking claw portion 214 is configured to bite into the inner surface of the tubular portion 23 more strongly when a force in the detaching direction is applied to the tubular portion 23. As a result, even if a force on the open end side along the tubular shaft is applied to the vent valve 200, the tubular portion 23 and the vent valve 200 are strengthened so that the vent valve 200 does not come out of the tubular portion 23. Is connected to. Further, the ventilation valve 200 of the present embodiment is configured such that the locking claw portion 214 is tilted in the separating direction by the tilting operation portion (standing wall 213). That is, the force suddenly applied to the vent valve 200 mounted on the tubular portion 23 is generally assumed to be a linear force along the tubular shaft, but the locking claw portion 214 and the tubular portion are formed. The locked state with the inner surface of the portion 23 effectively regulates the relative movement of the vent valve main body 210 along the tubular shaft toward the open end side of the tubular portion 23. On the other hand, by operating the tilting operation unit as necessary to tilt the locking claw portion 214 in a direction away from the inner surface of the tubular portion 23, the vent valve 200 can be moved into the tubular portion without any difficulty. It can be easily separated from 23. Therefore, the vent valve 200 of the present embodiment can be firmly attached to the tubular portion 23 and can be easily detached from the tubular portion 23. As a result, maintenance work related to the piping structure 20 such as inspection and replacement of the ventilation valve 200 becomes remarkably easy.

[Third Embodiment]
Next, with reference to FIGS. 21 to 23, the tubular body 300 of the third embodiment utilizing the principle of the present invention and the piping structure 30 provided with the tubular body 300 will be described. FIG. 21 is an exploded perspective view of the piping structure 30. As shown in FIG. 21, in the present embodiment, the tubular body 300 is integrally formed as a tubular portion with the drainage pipe joint 12 of the drainage pipe 11 as a piping material. Further, in the piping structure 30, the lid-shaped insertion body 350 is inserted into the tubular body 300 to block the communication passages communicating with the inside and outside of the piping material (drainage pipe 31 or drainage system). The tubular body 300 of the third embodiment is provided not on the mounting body 100 (inserting body) side but on the tubular portion 13 (cylindrical body) side of the mechanism of the locking claw portion 114 of the first embodiment. It is also understandable.

The tubular body 300 has an open end into which the insert body 350 is inserted, and has a hollow tubular portion 310 extending along the tubular axis and a pair of locking claws extending radially inward from the inner surface of the tubular portion 310. A unit 314 is provided. By inserting the claw member 314A (having a shape and structure similar to that of the claw member 114A in FIG. 8) into the slit 313c formed in the inner wall of the tubular body 300, the locking claw portion 314 is radially oriented from the inner surface of the tubular body 300. It is provided so as to protrude inward. The locking claw portion 314 projects through the tip blade 314a within the tubular portion 310 with a length capable of contacting the outer surface of the insertion body 350.

As shown in FIG. 22A, the locking claw portion 314 extends diagonally downward inward in the radial direction, and the tip blade 314a faces inward in the radial direction. That is, the locking claw portion 314 is inclined and extended (with respect to the horizontal plane orthogonal to the cylinder axis) so that the base end thereof is located on the detachment direction side from the tip in the cross-sectional view cut along the radial direction. Exists. The locking claw portion 314 can be elastically deformed so as to bend in and out in the radial direction like a leaf spring. That is, the locking claw portion 314 can be elastically deformed so as to allow the insertion body 350 to move in the insertion direction. Then, the locking claw portion 314 has the insertion body 350 outer surface so as to restrict the relative movement of the insertion body 350 toward the opening end side along the cylinder axis in a state where the insertion body 350 is inserted into the tubular portion 310. Is configured to lock.

As shown in FIG. 22B, the end face of the tip blade 314a facing inward in the radial direction of the locking claw portion 314 is orthogonal to the tubular axis so as to approximately follow a virtual spiral curve centered on the tubular axis. It is inclined in the circumferential direction with respect to the horizontal plane. That is, in FIG. 22B, the tip blade 314a is in an inclined posture so that the right end side of the end surface of the tip blade 314a extending in a straight line is raised. All of the plurality of locking claws 314 are inclined in the same spiral direction and at the same angle so that the tip blades 314a of the plurality of (two in the present embodiment) locking claws 314 cooperate with each other like a screw thread. It is configured as follows. The inclination angle is preferably set to about 45 degrees or less with respect to the horizontal direction, but is arbitrarily set within a range that functions like a screw thread. In this embodiment, the inclination angle is 5 degrees. According to the structure of the locking claw portion 314, when the insertion body 350 rotates about its central axis (cylindrical axis), the tip blade 314a of the locking claw portion 314 spirals along the outer surface of the insertion body 350. Move relative to each other. That is, as will be described later, when the insert body 350 rotates in one direction or the other direction inside the tubular portion 310, the tip blade 314a spirally scratches the outer surface of the insert body 350, and the insert body 350 has a tubular shape. It can be displaced toward the open end side or the back side of the portion 310. Then, the locking claw portion 314 has a force weaker than the force required for moving the vent valve main body 110 toward the opening end side along the tubular axis in a state where the insertion body 350 is inserted into the tubular portion 310. The vent valve main body 310 can be rotated and moved. Further, as in the first embodiment, the force required for rotation of the tubular portion 310 in one direction around the tubular axis and the force required for rotation in the other direction are configured to be different. May be good.

FIG. 23 is a schematic cross-sectional view of the piping structure 30 in which the insert body 350 is attached to the tubular portion 310 of the tubular body 300. As shown in FIG. 23, the tip blades 314a of the pair of locking claws 314 are in contact with the outer surface of the insert 350 and bite into it. As a result, the locking claw portion 314 locks the outer surface of the insert body 350 so as to restrict the relative movement of the insert body 350 and the tubular portion 310 in the detachment direction along the cylinder axis. More specifically, the locking claw portion 314 is inclined and extends so that the base end thereof is located on the open end side of the tip in the locked state between the tip blade 314a and the outer surface of the insert body 350. At the same time, it is configured to bend and deform in and out in the radial direction. Therefore, when a force on the opening end side of the tubular portion 310 is applied to the insert body 350, the locking claw portion 314 is elastically deformed so as to expand inward in the radial direction, so that the outer surface of the insert body 350 of the tip blade 314a The contact (bite) with respect to the object becomes stronger, and the locking force by the locking claw portion 314 becomes stronger. That is, the locking claw portion 314 effectively prevents the insertion body 350 from moving in the detaching direction along the tubular shaft so as to come out of the tubular portion 310. Therefore, in the piping structure 30 of the present embodiment, the ventilation valve 300 is firmly fixed to the tubular portion 23 so as to withstand the water pressure in the full water test.

Then, in order to attach the insert body 350 to the cylinder body 300, the insert body 350 can be easily attached to the cylinder body 300 by inserting the insert body 350 into the cylinder body 300 and pushing it to the back side thereof. In particular, when the insertion body 350 is inserted into the tubular portion 310, when the insertion body 350 is moved in the insertion direction with respect to the tubular portion 310, the tip blade 314a of the locking claw portion 314 hits the outer surface of the insertion body 350. In contact with each other, the locking claw portion 314 is elastically deformed so as to bend outward in the radial direction. Due to this elastic deformation in the radial outward separation direction, the locking force of the locking claw portion 314 with respect to the outer surface of the insert body 350 is hardly exerted, and the insert body 350 does not bite into the outer surface of the insert body 350 with the tip portion 314a. It can be easily moved in the insertion direction inside the tubular portion 310. That is, the relative movement of the insert body 350 into the tubular portion 310 in the insertion direction is allowed, and the insert body 350 can be easily inserted into the tubular portion 310. Then, when the insertion body 350 is inserted all the way into the tubular portion 310 to stop the movement in the tubular axis direction, the tip blade 314a can be made to bite into the outer surface of the insertion body 350 by the elastic return force of the locking claw portion 314. it can. As a result, the insertion body 350 can be fixed to the tubular body 300 to construct the piping structure 30.

On the other hand, in order to separate the insert body 350 from the cylinder body 300, in the locked state between the locking claw portion 314 and the inner surface of the tubular portion 13, the insertion body 350 is rotated in one direction around the cylinder shaft. , The insert body 350 can be displaced toward the open end side of the tubular portion 310. At this time, since the circumferential edge of the tip blade 314a is sharp enough to cut the outer surface of the insert body 350, it is weaker than the force required to move the insert body 350 toward the open end side along the tubular axis. The insert body 350 can be rotationally moved by force. In the present embodiment, the edge on the upper side (right side in FIG. 22B) of the tip blade 314a has better sharpness, so that the force required for rotation in one direction (disengagement direction) about the cylinder axis. However, it is smaller than the force required for rotation in the other direction (insertion direction). When the insert body 350 is rotated in the other direction, the insert body 350 is displaced toward the back side of the tubular portion 310. As a result, the operator can easily distinguish the rotation direction to be displaced in the detaching direction. Then, as the insert body 350 rotates in one direction inside the tubular portion 310, the end face of the tip blade 314a is inclined in a direction approximately along the virtual spiral curve centered on the tubular axis. , The tip blade 314a spirally scratches the outer surface of the insert body 350 to cut a screw groove, and the insert body 350 is displaced toward the open end side. Therefore, the operator can easily separate the insert body 350 from the cylinder body 310 by rotating the insert body 350 in one direction.

That is, according to the tubular body 300 of the present embodiment, with the insert body 350 inserted into the tubular portion 310, the locking claw portion 314 abuts on the outer surface of the insert body 350 so as to bite into the outer surface of the insert body 350. By locking, the insertion body 350 is restricted from moving relative to the opening end side (disengagement direction) of the tubular portion 310 along the tubular axis. As a result, even if a force on the opening end side along the cylinder axis is applied to the insert body 350, the cylinder body 300 and the insert body 350 are firmly held so that the insert body 350 does not come out of the tubular portion 310. Be connected. Further, the tubular body 300 of the present embodiment is configured so that the insert body 350 is displaced toward the opening end side by the rotational movement of the insert body 350 about the cylinder axis. That is, the force suddenly applied to the insert body 350 mounted on the tubular portion 310 is generally assumed to be a linear force along the tubular axis, but the locking claw portion 314 and the insert body The locked state with the outer surface of the 350 effectively regulates the relative movement of the insert 350 along the tubular axis toward the open end side of the tubular portion 310. On the other hand, by rotating the insert body 350 as needed, the insert body 350 can be easily separated from the tubular portion 310 without any difficulty. Therefore, the tubular body 300 of the present embodiment can firmly hold the insert body 350 and can easily detach the insert body 350 from the tubular portion 310. As a result, maintenance work related to the piping structure 30 such as internal inspection of the tubular body 300 and replacement of the insert body 350 becomes remarkably easy.

[Modification example]
The present invention is not limited to the above embodiment, and various modifications can be taken. Hereinafter, modifications of the present invention will be described. In each modification, the components having the last two digits in common among the components indicated by the three digits have the same or similar characteristics unless otherwise explained, and some of the description thereof will be omitted.

(1) The attachment body of the present invention is not limited to the configuration of the vent valve of the first and second embodiments. For example, FIG. 24 shows the piping structure 40 as another embodiment of the first embodiment. The piping structure 40 includes a tubular portion 43 extending in the axial direction so as to form a communication passage that opens to the outside and communicates with the inside and outside of the piping material 41, and an opening of the tubular portion 43 so as to close the communication passage. The attachment body 400 is attached to the. The attachment body 400 is inserted into the tubular portion 43 and has a peripheral wall 411 that extends in the axial direction along the inner peripheral surface of the tubular portion 43. A locking claw portion 414 that locks to the inner surface of the tubular portion 43 so as to restrict relative movement in the direction is provided. In the piping structure 40 of this modified example, the attachment body 400 is attached so as to constantly close the opening of the tubular portion 43. Furthermore, the attachment body of the present invention can be applied to a connection structure with a tubular portion in all applications.

(2) The tubular body of the present invention is not limited to the configuration of the tubular body of the third embodiment. That is, in the above embodiment, the tubular body is integrally formed as the tubular portion of the drain pipe joint 12, but it may be a single tubular body that can be fixed to the drain pipe or the drain pipe joint. Further, the tubular body provided with the joint and the locking claw portion may be separate bodies. Then, the insert body of the third embodiment may be replaced with a vent valve. Furthermore, the tubular body is not limited to piping applications, and can be applied to a connection structure with an insert body in all applications.

(3) The configurations of the above embodiments may be combined and applied. For example, the action of the locking claw portion of the first embodiment due to the bending deformation and the action of the tilting operation portion of the second embodiment are made to cooperate to facilitate the insertion of the attachment body into the tubular portion. It may be configured as.

(4) In the first and third embodiments, the locking claw portion spirally moves with respect to the attachment target and is displaced in the detaching direction by a simple rotation operation. However, not only the rotation operation but also the rotation operation of the attachment body or the insertion body while applying a force in the pulling direction along the cylinder axis to the attachment body or the insertion body causes the attachment body or the insertion body to be displaced in the detachment direction. May be good. For example, if the angle of inclination of the locking claw is shallow, or if the spiral scratch cannot be made well by the rotation operation, or if the configuration cannot be effectively moved in the detachment direction only by the rotation operation, the pulling direction is linear. By applying a strong force, it is possible to effectively assist the detachment of the attachment body or the insertion body.

(5) In the above embodiment, the number of locking claws is two, but in the present invention, the number of locking claws may be one or three or more.

(6) In the present embodiment, the valve body of the vent valve is urged in the closing direction by the repulsive force of the magnet, but the present invention is not limited to this. For example, the urging of the valve body may be performed by another mechanism such as a spring 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 embodiments as long as it belongs to the technical scope of the present invention. That is, within the technical scope of the present invention, some configurations of the present embodiment may be omitted or modified, or other configurations may be added.

10 Piping structure 11 Drainage pipe (piping material)
12 Drainage pipe joint (piping material)
13 Cylindrical part 100 Vent valve (attachment body)
110 Vent valve body (main body)
110a Ventilation port 110b Connection port 110c Valve body accommodation space 111 Peripheral wall 111a Concave groove 112 Upper wall 112a Beam-shaped part 113 Standing wall 113a Connecting piece 113b Holding part 113c Slit 114 Locking claw part 114a Tip blade 114b Holding piece 115 Body side holding surface 115a Protrusion part 116 Packing 117 Main body side magnet holding part 117a Shaft hole 117b Main body side magnet 118 Water stop member 120 Valve body (closed part)
121 Valve body 122 Valve body side holding surface 123 Valve shaft 124 Valve body side magnet holding part 124a Valve body side magnet 130 Cover body 131 Connecting hole 132 Notch part 200 Vent valve (attachment body)
213c Tilt operation unit 230 cover body (tilt regulation unit)
300 Cylinder 310 Cylinder 314 Locking claw 350 Insert

Claims (16)

A main body that is inserted from the open end into a hollow tubular part that extends along the cylinder axis,
With the main body protruding radially outward from the outer surface of the main body so as to be in contact with the inner surface of the tubular portion and the main body being inserted into the tubular portion, the main body is detached along the tubular axis. A locking claw portion that locks on the inner surface of the tubular portion so as to regulate relative movement in the direction is provided.
In the locked state between the locking claw portion and the inner surface of the tubular portion, the main body portion is configured to be displaced toward the opening end side by the rotational movement of the main body portion around the tubular shaft. An attachment body characterized by being present. The attachment body according to claim 1, wherein the locking claw portion allows relative movement of the main body portion in the insertion direction along the tubular axis. 2. The locking claw portion is characterized in that its tip is inclined and extends so as to be located on the side in the detaching direction from the base end, and is deformable so as to bend in and out in the radial direction. The attachment body described in. A tip blade capable of biting into the inner surface of the tubular portion is provided at the tip of the locking claw portion, and the end surface of the tip blade facing outward in the radial direction is a virtual spiral centered on the tubular shaft. It is inclined in the circumferential direction with respect to the horizontal plane orthogonal to the cylinder axis so as to approximately follow the curve.
By rotating the main body portion in one direction or the other direction inside the tubular portion, the tip blade spirally scratches the inner surface of the tubular portion, and the main body portion is on the open end side of the tubular portion or. The attachment body according to any one of claims 1 to 3, wherein the attachment body can be displaced to the back side. The locking claw portion has a force weaker than the force required to move the main body portion toward the opening end side along the tubular axis in a state where the main body portion is inserted into the tubular portion. The main body can be rotationally moved, and the force required to rotate the tubular portion in one direction around the tubular axis and the force required to rotate in the other direction are configured to be different. The attachment body according to any one of claims 1 to 4, wherein the attachment body is characterized by the above. The base end portion of the claw member is held by the main body portion, the tip end portion of the claw member is bent and extended from the base end portion, and the locking claw portion is formed at the tip end portion. The attachment body according to any one of claims 1 to 5. The attachment body according to any one of claims 1 to 6, wherein two or more locking claws are provided at intervals in the circumferential direction. A main body that is inserted from the open end into a hollow tubular part that extends along the cylinder axis,
With the main body protruding from the outer surface of the main body so as to be in contact with the inner surface of the tubular portion and the main body being inserted into the tubular portion, the opening end side of the main body along the tubular axial direction. A locking claw portion that locks on the inner surface of the tubular portion so as to regulate relative movement to the tubular portion is provided.
The attachment body is provided with a tilting operation portion for tilting the locking claw portion in a separating direction with respect to the inner surface of the tubular portion. The claim is characterized in that the tilting of the locking claw portion by the tilting operation portion allows the main body portion to move in the insertion direction and the detachment direction along the tubular shaft inside the tubular portion. The attachment body according to 8. The attachment body according to claim 8 or 9, further comprising a tilt regulating portion that regulates the tilt of the locking claw portion due to the free tilting of the tilt operating portion. In order to function as a vent valve, the main body has vents and connection ports at both ends in the tubular axis direction, and the valve body is movably held in the valve body accommodating space between the vent and the connection port. The attachment body according to any one of claims 1 to 10, wherein the attachment body is characterized in that. A tubular portion that extends in the axial direction so as to form a communication passage that opens to the outside and communicates with the inside and outside of the piping system.
A piping structure comprising the attachment body according to any one of claims 1 to 11, which is inserted and attached to the tubular portion so as to close the communication passage. A hollow tubular portion that has an open end for inserting the insert and extends along the tubular axis,
Inside the tubular portion, the tubular portion protrudes radially inward from the inner surface of the tubular portion so as to be in contact with the outer surface of the insert body, and is elastically deformed so as to allow the insert body to move in the insertion direction. With the insert body inserted therein, a locking claw portion that locks the outer surface of the insert body so as to restrict the relative movement of the insert body toward the opening end side along the cylinder axis. Prepare,
In the locked state between the locking claw portion and the outer surface of the insert body, the insert body is configured to move relative to the opening end side by the rotational movement of the insert body around the cylinder axis. A cylinder characterized by being present. The claim is characterized in that the locking claw portion is inclined and extends so that its base end is located closer to the opening end side than the tip end, and is deformable so as to bend in and out in the radial direction. 13. The tubular body according to 13. A tip blade capable of biting into the outer surface of the insert is provided at the tip of the locking claw portion, and the end surface of the tip blade facing inward in the radial direction is a virtual spiral curve centered on the cylinder axis. It is inclined in the circumferential direction with respect to the horizontal plane orthogonal to the cylinder axis so as to approximately follow the above.
When the insert body rotates in one direction or the other direction inside the tubular portion, the tip blade spirally scratches the outer surface of the tubular portion, and the insert body is on the open end side of the tubular portion or. The tubular body according to claim 13 or 14, characterized in that it can be displaced to the back side. The tubular body according to any one of claims 13 to 15, which forms a communication passage that opens to the outside and communicates with the inside and outside of the piping system.
A piping structure comprising an insert body inserted into and mounted on the tubular portion of the tubular body so as to close the communication passage.

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