JP6467020B2 - Ventilation valve and piping structure - Google Patents

Description

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

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

  For example, Patent Document 1 discloses a main body (10) in which a connection port (12) connected to a drain pipe (101) and a vent hole (25) for introducing outside air into the drain pipe (101) are formed, and a vent hole. Disclosed is a vent valve (1) including a valve body (40) that can close (25) and can be opened by a negative pressure of a drain pipe (12). In the vent valve (1), the magnet (18) is fitted into the magnet hole (17) of the partition (16) formed in the main body (10), and the guide groove (44) of the valve body (40) is inserted. A magnet (45) is embedded below. The valve element (40) closes the vent hole (25) by the repulsive closing force of the magnets (18, 45). On the other hand, when the negative pressure of the drain pipe (101) increases and becomes larger than the closing pressure of the valve body (40) by the magnets (18, 45), the magnets (18, 45) come close to each other and the valve body (40). Opens the vent (25) to eliminate the negative pressure in the drain pipe (101). When the negative pressure in the drain pipe (102) is eliminated, the valve body (40) closes the vent (25) by the repulsive force of the magnets (18, 45) and returns to the normal state.

JP 2009-299866 A

  In the vent valve of Patent Document 1, when the negative pressure inside the drain pipe (piping material) rises, the valve body moves so that the magnet fixed to the valve body and the magnet fixed to the main body are close to each other. Open the vent. The repulsive force between the valve body side magnet and the main body side magnet increases as the distance that the valve body moves in the opening direction increases and the magnets approach each other. Therefore, the opening degree of the valve body is limited by the repulsive force of the magnet. In particular, when the negative pressure inside the drain pipe is relatively high, if the opening of the valve body becomes relatively large, the repulsive force between adjacent magnets will exceed the force acting on the valve body at negative pressure, and the negative pressure will increase. Compared to the above, the opening degree of the valve body is not sufficiently large, and it takes time to eliminate the negative pressure of the drain pipe. Further, depending on the degree of negative pressure, the outside air suction speed is insufficient, and the negative pressure in the drain pipe cannot be sufficiently eliminated, and there is a concern that sealing water may be destroyed. That is, there is a need for a vent valve that can sufficiently open the valve body according to the strength of the negative pressure when the negative pressure inside the drain pipe is large and can quickly and reliably eliminate the negative pressure in the exhaust pipe. It has been.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a ventilation valve and a piping structure that can quickly and surely eliminate the negative pressure in the piping material.

A vent valve according to one aspect of the present invention is a vent valve body having a connection port connected to the piping material and a ventilation port for introducing outside air into the piping material,
A valve shaft extending in the axial direction inside the vent valve body;
A valve body that moves along the axial direction of the valve shaft from the closed position of the vent hole to the open position when the piping material becomes negative pressure;
A first magnet coupled to the valve body;
A second magnet that is supported movably along the valve shaft at a position separated from the first magnet, repels the first magnet at the initial position, and biases the valve body to the closed position;
Return means for returning the second magnet to the initial position,
When the piping material becomes negative pressure, the first magnet moves to the second magnet side as the valve body moves, and the second magnet is separated from the first magnet by the repulsive force between the first magnet and the second magnet. By moving along the valve axis, the valve body is placed in the open position,
When the negative pressure of the piping material is eliminated, the return means returns the second magnet to the initial position, and the valve body is urged to the closed position by the repulsive force between the first magnet and the second magnet to close the vent valve. It is characterized by that.

  The vent valve according to one aspect of the present invention is characterized in that the return means is configured to bias the second magnet toward the first magnet.

  A vent valve according to one aspect of the present invention is characterized in that a valve shaft is integrally connected to a valve body, and a guide portion that guides movement of the valve shaft is provided in the vent valve body.

  The vent valve according to one aspect of the present invention is characterized in that the return means is a third magnet arranged to repel the second magnet and bias the second magnet toward the first magnet.

  In the vent valve according to one aspect of the present invention, the first magnet, the second magnet, and the third magnet are aligned along the axial direction, the first magnet is fixed to the valve body, and the third magnet is fixed to the vent valve body. The second magnet is supported so as to be movable along the valve axis between the first magnet and the third magnet.

  In the vent valve according to one aspect of the present invention, at least one fourth magnet is disposed between the second magnet and the third magnet, and the at least one fourth magnet is movable in the axial direction and is second. It is characterized by repulsion with both the magnet and the third magnet.

A vent valve according to one aspect of the present invention includes a vent valve body having a connection port connected to the piping material and a ventilation port for introducing outside air into the piping material,
A valve body that moves along the axial direction from the closed position of the vent to the open position when the piping material becomes negative pressure;
A first magnet coupled to the valve body;
A second magnet that is pivotally supported by a shaft portion provided in the vent valve body at a position separated from the first magnet, repels the first magnet at the initial position, and biases the valve body to the closed position;
Return means for returning the second magnet to the initial position,
When the piping material becomes negative pressure, the first magnet moves to the second magnet side as the valve body moves, and the second magnet escapes from the first magnet by the repulsive force between the first magnet and the second magnet. By rotating, the valve body is placed in the open position,
When the negative pressure of the piping material is eliminated, the return means returns the second magnet to the initial position, and the valve body is urged to the closed position by the repulsive force between the first magnet and the second magnet to close the vent valve. It is characterized by that.

  In the vent valve according to one aspect of the present invention, the return means includes a weight body connected to the second magnet and disposed on the opposite side of the second magnet via the shaft portion, and the weight body is more than the second magnet. It is heavy and is characterized in that the second magnet is returned to above the shaft portion by gravity.

  A piping structure according to an aspect of the present invention is a piping structure in which piping material is piped, and a vent valve is connected to a connecting end of the piping material through a connection port so as to eliminate negative pressure in the piping material. It is characterized by that.

  According to the vent valve of one aspect of the present invention, when the inside of the piping material becomes negative pressure, the first magnet moves to the second magnet side with the movement of the valve body. The second magnet moves along the valve shaft in a direction away from the first magnet so as to suppress an increase in repulsive force between the first magnet and the second magnet. That is, when the first magnet together with the valve body approaches the second magnet along the axial direction, the second magnet repels and moves so as to escape from the first magnet. The increase in repulsive force is effectively suppressed. Until the valve body reaches the open position, the repulsive force from the second magnet acting on the valve body (urging the valve body to the closed position) is effectively reduced, and the first and second The degree to which the opening degree of the valve body is restricted due to the increase in repulsive force between the magnets can be greatly reduced. After the outside air is sucked into the piping material and the negative pressure is eliminated, the return means returns the second magnet to the initial position. Thereby, a 2nd magnet repels a 1st magnet and moves a valve body to a closed position rapidly. Furthermore, in this invention, a valve body, a 1st magnet, and a 2nd magnet move along the axial direction of a valve shaft. That is, since the moving direction of the valve body, the first magnet and the second magnet is uniquely determined in the axial direction of the valve shaft, the valve body repeatedly moves between the open position and the closed position more smoothly and accurately. It becomes possible. In addition, even when the ventilation valve is tilted, the valve element is operated by the repulsive force between the first and second magnets along the axial direction, so that the influence of gravity can be almost ignored. Therefore, the vent valve of the present invention can operate quickly and accurately, and can eliminate the negative pressure of the piping material more quickly and reliably.

  According to the vent valve of one aspect of the present invention, the return means is configured to bias the second magnet toward the first magnet, thereby reducing the force acting on the valve body by eliminating the negative pressure. Then, the second magnet can be quickly returned to the initial position, and the valve body can be moved to the closed position.

  According to the vent valve of one embodiment of the present invention, the guide portion of the vent valve main body guides the movement of the valve shaft integrated with the valve body, thereby moving the valve body in the axial direction more smoothly and accurately. be able to.

  According to the vent valve of one aspect of the present invention, the return means is a third magnet disposed so as to repel the second magnet and bias the second magnet toward the first magnet, thereby providing a negative pressure. When the force acting on the valve body is reduced and the repulsive force between the second magnet and the third magnet is reduced, the second magnet can be quickly returned to the initial position and the valve body can be moved to the closed position. it can.

  According to the vent valve of one aspect of the present invention, the first magnet is fixed to the valve body, and the third magnet is fixed to the vent valve body, so that the second magnet is between the first magnet and the third magnet. It is arranged to be movable along the axial direction. Since the first magnet, the second magnet, and the third magnet are aligned along the axial direction, the repulsion between the first to third magnets along the axial direction is possible even when the vent valve is tilted. Since the valve element is operated by force, the influence of gravity can be almost ignored. That is, the vent valve of the present invention can quickly and reliably eliminate the negative pressure of the piping material with a simple structure.

  According to the vent valve of one aspect of the present invention, the distance between the first magnet and the third magnet is increased by disposing at least one fourth magnet between the second magnet and the third magnet. The movable range of the valve body can be effectively expanded. Moreover, since the moving direction of the fourth magnet is restricted to the axial direction, even if the fourth magnet is added, the operation does not become complicated.

  According to the vent valve of one aspect of the present invention, when the inside of the piping material becomes negative pressure, the first magnet moves to the second magnet side as the valve body moves. The magnetic pole of the second magnet rotates in a direction away from the first magnet so as to suppress an increase in repulsive force between the first magnet and the second magnet. That is, when the first magnet and the second magnet come close to the second magnet, the second magnet rotates so as to escape from the first magnet, so the direction of the magnetic pole of the second magnet deviates from the direction of the first magnet. The increase in repulsive force between the first magnet and the second magnet is effectively suppressed. Until the valve body reaches the open position, the repulsive force from the second magnet acting on the valve body (urging the valve body to the closed position) is effectively reduced, and the first and second The degree to which the opening degree of the valve body is restricted due to the increase in repulsive force between the magnets can be greatly reduced. After the outside air is sucked into the piping material and the negative pressure is eliminated, the return means rotates the second magnet again to return to the initial position. As a result, the distance between the first and second magnets is shortened again, and the second magnet repels the first magnet and quickly moves the valve body to the closed position. Therefore, the vent valve of the present invention can operate quickly and accurately, and can more reliably eliminate the negative pressure of the piping material.

  According to the vent valve of one aspect of the present invention, the return means is configured by a weight that is heavier than the second magnet, whereby the second magnet can be returned to the upper side of the shaft portion by gravity. Therefore, the return means can be a simple mechanism.

  According to the piping material structure of one aspect of the present invention, the effect of the vent valve can be exhibited as a piping structure. That is, the piping structure of the present invention can eliminate the negative pressure of the piping material more quickly and reliably by the vent valve.

The perspective view of the vent valve of one Embodiment (Example 1) which concerns on this invention. The (a) top view and (b) side view of the ventilation valve of FIG. The perspective view of the vent valve main body of the vent valve of FIG. (A) BB sectional drawing and (b) CC sectional drawing of the vent valve main body of FIG. The perspective view of the valve body of the ventilation valve of FIG. (A) DD figure and (b) EE sectional drawing of the valve body of FIG. The (a) perspective view and (b) sectional drawing of the cover body of the ventilation valve of FIG. FIG. 3 is a cross-sectional view of the vent valve of FIG. 2 along AA. FIG. 2 is an exploded perspective view of the vent valve of FIG. 1. Schematic which shows the piping structure where the ventilation valve of FIG. 1 was connected with the drain pipe. In the piping structure of FIG. 10, (a) the drain pipe is not in a negative pressure state and the valve body of the vent valve is in the closed position, and (b) the vent pipe is open in the negative pressure state. The form in position is shown. Sectional drawing of the vent valve of another embodiment (Example 2) which concerns on this invention. 12 shows a configuration in which (a) the drain pipe is not in a negative pressure state and the valve body of the vent valve is in the closed position, and (b) the vent valve is in a negative pressure state. The form with the body in the open position is shown. Sectional drawing of the vent valve of another embodiment (Example 3) which concerns on this invention. Sectional drawing of the vent valve of another embodiment (Example 4) which concerns on this invention. Sectional drawing of the vent valve of another embodiment (Example 5) which concerns on this invention. The perspective view of the vent valve of another embodiment (Example 6) which concerns on this invention. (A) FF sectional drawing and (b) GG sectional drawing of the vent valve of FIG. 17 shows a configuration in which (a) the drain pipe is not in a negative pressure state and the valve body of the vent valve is in a closed position, and (b) the vent valve is in a negative pressure state. The form with the body in the open position is shown.

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

Example 1
FIG. 1 is a perspective view of a vent valve 100 according to an embodiment of the present invention. 2A and 2B are a plan view and a side view of the vent valve 100, respectively. 8 is a cross-sectional view of the vent valve 100 taken along the line AA. As shown in FIGS. 1, 2, and 8, the vent valve 100 is accommodated in a vent valve main body 110 connected to a drain pipe (piping material) P, the vent valve main body 110, and a first magnet M <b> 1 is connected. The valve body 130, the second magnet holder 150 that holds the second magnet M2 movably along the valve shaft 135 (first shaft portion 135a) of the valve body 130, and the valve body 130 And a cover body 170 attached to one end of the vent valve main body 110. Next, each component will be described in detail with reference to FIGS.

  First, the vent valve body 110 will be described with reference to FIGS. 3 and 4. FIG. 3 is a perspective view of the vent valve main body 110. 4A and 4B are a BB cross-sectional view and a CC cross-sectional view of the vent valve main body 110, respectively. As shown in FIG. 3, the vent valve main body 110 is composed of a cylindrical synthetic resin casing 111 extending from one end to the other end of which both ends are open. As shown in FIG. 4A, the inner wall of the casing 111 is formed by combining a small diameter portion, a large diameter portion, a tapered portion, and a small diameter portion from the upper end.

  A circular opening end 118 is formed at one end (upper end) of the vent valve main body 110. As shown in FIG. 4A, a circular vent 112 that is opened and closed by the valve body 130 is formed below the opening end portion 118. The vent 112 communicates with the open end 118 and can introduce outside air into the vent valve main body 110. The vent 112 has an inner diameter smaller than the diameter of the disc-shaped valve body main body 131 of the valve body 130. A valve seat (or valve seat surface) 113 is provided on the lower end side so as to border the vent 112. As will be described later, when the packing 132 of the valve body 130 is in close contact with the valve seat 113, the vent 112 is closed. A valve body accommodating space 114 is defined below the vent 112 and the valve seat 113 inside the casing 111. The valve body accommodation space 114 accommodates the valve body 130 so as to be movable up and down.

  A short cylindrical third magnet holding portion 115 for disposing a third magnet M3, which is a permanent magnet, is provided below the valve body accommodating portion 114 as a return means. The third magnet holding part 115 has an annular groove part between the inner peripheral wall and the outer peripheral wall. On the other hand, the third magnet M3 is an annular body having a predetermined thickness and height. The third magnet M3 is preferably a rare earth magnet such as a neodymium magnet. The third magnet M <b> 3 is accommodated in the annular groove portion of the third magnet holding portion 115 and is fixed to the third magnet holding portion 115. In addition, as shown in FIG. 4B, the third magnet holding portion 115 is located at the center in the radial direction of the housing portion 111 and is supported by a rib 115 a provided between the inner walls of the housing portion 111. The ribs 115a extend radially from the outer peripheral wall of the third magnet holding portion 115 in four directions. The ribs 115a are orthogonal to each other in a cross shape, and two pairs of rib connecting portions 111a are formed on an inclined surface in which the inner wall of the casing portion 111 inclines in a taper shape from the upper side to the lower side near the lower end of the valve body accommodating space 114. Is fixed through. The two pairs of rib connecting portions 111a are integrally formed on the inner wall of the casing portion 111 so as to face each other.

  Further, the first guide portion 116 is defined by the inner surface of the inner peripheral wall of the third magnet holding portion 115. The first guide portion 116 is a shaft hole located at the radial center of the vent valve body 110, and functions to guide the movement of a valve shaft 135 (first shaft portion 135a) of the valve body 130 described later.

  As shown in FIG. 4A, the second guide portion 117 is provided between the vent hole 112 and the opening end portion 118. The second guide portion 117 is a shaft hole located at the radial center of the vent valve main body 110, and functions to guide the movement of a valve shaft 135 (second shaft portion 135b) of the valve body 130 described later. The 2nd guide part 117 is supported by the rib 117a constructed between the inner walls of the housing | casing part 111 (refer FIG. 3). The rib 117 a extends from the outer peripheral wall of the second guide portion 117 and is integrated with the inner wall above the housing portion 111.

  A connection port 119 for connecting to the connection end P ′ of the drain pipe P is formed at the other end (lower end) of the vent valve main body 110. That is, the vent 112, the open end 118, and the connection port 119 communicate with each other in the vent valve main body 110. The connection port 119 is defined by the tip of the inner cylinder wall 119a. When the inner cylindrical wall 119 a is fitted into the connection end P ′ of the drain pipe P, the connection port 119 is connected to the drain pipe P. On the other hand, a cylindrical outer cylinder wall 119b is formed on the radially outer side of the inner cylinder wall 119a. The outer cylindrical wall 119b extends downward along the axial direction from the outer surface of the tapered portion of the casing 111. The outer cylinder wall 119b is configured to be fitted into a piping material having a larger inner diameter. That is, the connection port 119 is configured to be able to connect piping materials having two types of diameters.

  Next, the valve body 130 will be described with reference to FIGS. 5 and 6. FIG. 5 is a perspective view of the valve body 130. FIG. 6 is a (a) DD cross-sectional view and (b) EE cross-sectional view of the valve body 130. As shown in FIG. 5, the valve body 130 includes a disc-shaped valve body 131 made of synthetic resin, a packing 132 made of synthetic rubber or the like exposed on the upper surface side in the vicinity of the outer periphery of the valve body 131, and the valve The first magnet holding part 133 that holds the first magnet M1 at the center in the radial direction of the body 130, and the valve shaft 135 that extends vertically from the center of the valve body main body 131 coaxially. The first magnet M1 is a cylindrical block having a predetermined diameter and length, and is preferably a rare earth magnet such as a neodymium magnet.

  As shown in FIG. 6A, the valve body 131 is formed by superposing a lower first substrate 131a and an upper second substrate 131b. As shown in FIG. 6B, the first magnet holding portion 133 is integrally provided on the first substrate 131a in the center of the valve body 131. The first magnet holding part 133 is formed of a hollow cylindrical body, and includes the first magnet M1 therein. Then, the first magnet holding portion is provided on the first substrate 131a by the bottom wall protruding downward near the center of the first substrate 131a and the three ribs 133a extending radially from the cylindrical wall of the first magnet holding portion 133. 133 is connected.

  A packing 132 is sandwiched between the first substrate 131a and the second substrate 131b. The packing 132 is a disk-shaped flat packing, and a hole 132a is formed in the center. The first magnet holding part 133 is disposed in the hole 132a (see FIG. 9).

  In the valve body 131, the outer diameter of the first substrate 131a is larger than the outer diameter of the second substrate 131b. Further, the outer diameter of the first substrate 131 a is substantially equal to the outer diameter of the packing 132. That is, the entire packing 132 is supported on the upper surface of the first substrate 131a, and the upper surface of the packing 132 is exposed upwardly outside the second substrate 131b. The outer diameter of the first substrate 131a is larger than the inner diameter of the vent 112, and the outer diameter of the second substrate 131b is slightly smaller than the inner diameter of the vent 112. That is, when the vent 112 is closed by the valve body 130, the second substrate 131b is disposed in the vent 112, and the packing 132 on the upper surface of the first substrate 131a can be engaged with the valve seat 113 around the vent 112. A valve body 130 is configured.

  A first shaft portion 135a of the valve shaft 135 extending downward is integrally formed at the center of the lower surface of the first substrate 131a of the valve body 131. The first shaft portion 135a passes through the shaft hole of the first guide portion 116 of the vent valve main body 110, and is configured to be movable up and down in the shaft hole. Further, the first shaft portion 135a passes through the shaft hole of the annular second magnet holder 150 and is configured to be movable relative to each other. On the other hand, a second shaft portion 135b of the valve shaft 135 extending upward is integrally formed at the center of the upper surface of the second substrate 131b of the valve body 131. The second shaft portion 135b is configured to pass through the shaft hole of the second guide portion 117 of the vent valve main body 110 and to move up and down in the shaft hole.

  Next, the second magnet holder 150 will be described. The second magnet holder 150 holds the second magnet M2 between the outer peripheral wall and the inner peripheral wall. The second magnet M2 is an annular body having a predetermined thickness and height. The second magnet M2 is preferably a rare earth magnet such as a neodymium magnet. As described above, the shaft hole of the second magnet holder 150 is configured such that the first shaft portion 135a of the valve shaft 135 is loosely inserted.

  Next, the cover body 170 will be described with reference to FIG. 7A and 7B are a perspective view and a sectional view of the cover body 170. FIG. The cover body 170 is detachably attached to the vent valve body 110 arbitrarily or selectively. The cover body 170 functions to reduce dust and dust from entering the vent valve body 110 through the vent 112 and to physically protect the valve body 130. As shown in FIGS. 7A and 7B, the cover body 170 includes a cap member 171 having a shape like a third cap and a ventilation member 172 that opens below the cap member 171. It is open. The cap member 171 has a raised portion 171a that protrudes inward at the center thereof. As will be described later, the raised portion 171 a functions to guide the air flowing in from the side between the shade member 171 and the ventilation member 172 to the ventilation port 112. The shade member 171 is formed in a size that covers the upper surface of the vent valve body 110. The shade member 171 is fixed to the fixed cylinder 172c of the ventilation member 172 with screws (not shown) through the fixing hole 171b. The ventilation member 172 is formed of an annular plate body having an opening at the center and a raised opening periphery. More specifically, an opening 172 a that is joined to the opening end portion 118 of the ventilation valve main body 110 is formed at the center of the ventilation member 172. The outer peripheral edge of the opening 172a is inclined. Further, a curved slit-shaped fixing groove 172 b is formed in the vicinity of the outer periphery of the ventilation member 172. As will be described later, a fitting protrusion 111e protruding upward from one end of the vent valve main body 110 is fitted into the fixing groove 172b.

  Based on the description of each component described above, the structure of the vent valve 100 will be described in detail with reference to FIG. FIG. 8 is a cross-sectional view of the vent valve 100 taken along the line AA. The vent valve 100 in FIG. 8 is in a closed state in which the valve body 130 closes the vent 112, and maintains this state (that is, the initial position) unless an external force acts on the valve body 130.

  As shown in FIG. 8, a cover body 170 is attached to the upper end of the vent valve main body 110. The opening 172a of the cover body 170 communicates with the opening end portion 118 and the air vent 112 of the vent valve main body 110, and external air can be introduced into the inside from the side of the cover body 170. A valve element 130 is accommodated in the valve element accommodating space 114 of the vent valve main body 110. The valve body 130 is disposed at the closed position of the vent 112.

  More specifically, the second substrate 131b of the valve body 130 is disposed in the vent 112, and the packing 132 supported by the first substrate 131a is in close contact (pressure contact) with the seat surface of the valve seat 113. And the 1st axial part 135a of the valve stem 135 of the valve body 130 has penetrated the axial hole of the 1st guide part 116 under the valve body main body 131 in the loose insertion state. Similarly, the second shaft portion 135b of the valve shaft 135 passes through the shaft hole of the second guide portion 117 above the valve body main body 131 in a loosely inserted state. That is, the guide portions 116 and 117 provided on the vent valve main body 110 guide the vertical movement of the valve shaft 135. In other words, the guide portions 116 and 117 restrict the tilting of the movement axis along the axial direction of the valve body 130.

  In the vent valve 100, the first magnet M1, the second magnet M2, and the third magnet M3 are aligned along the axial direction of the valve shaft 135. Specifically, the first magnet M <b> 1 is disposed in the first magnet holding portion 133 of the valve body 130 in the vicinity of the vent 112. The first magnet M <b> 1 is movable along the axial direction of the valve shaft 135 together with the valve body 130. Further, the first shaft portion 135a of the valve shaft 135 passes through the second magnet holder 150 in a loosely inserted state. For this reason, the second magnet M2 can move along the axial direction on the first shaft portion 135a of the valve shaft 135 together with the second magnet holder 150. And the 3rd magnet holding part 135 which supports the 3rd magnet M3 is being fixed to the ventilation valve main body 110 so that it may be located in the radial direction center of the valve body accommodation space 114 lower end.

  The vent valve 100 of the present embodiment integrates the second magnet M2 and the third magnet M3 inside the vent 112 in the vent valve body 110 by incorporating (connecting) the first magnet M1 into the valve body 130. It is a thing. That is, the first magnet M1 is installed in the valve body 130, the third magnet M3 is fixed to the vent valve body 110 on the connection port 119 side of the valve body 130, and the second magnet M2 is connected to the first magnet M1. The third magnet M3 is supported so as to be movable along the valve shaft 135. These first magnet M1 and second magnet M2 are opposed to the same magnetic pole so as to repel each other. That is, due to the repulsive force between the first magnet M1 and the second magnet M2, the second magnet M2 in the initial position separates the first magnet M1 and urges it upward. Similarly, the second magnet M2 and the third magnet M3 are opposite to each other in the same polarity so as to repel each other. That is, due to the repulsive force between the second magnet M2 and the third magnet M3, the third magnet M3 as the return means separates the second magnet M2 and biases it to the initial position. That is, the repulsive force between these magnets cooperates, and the valve body 130 is urged to the closed position so that the packing 132 of the valve body 130 is in pressure contact with the valve seat 113.

  In addition, since the magnetic force of each magnet is set substantially equal, the 2nd magnet M2 is spaced apart at equal distance with respect to the 1st magnet M1 and the 3rd magnet M3. However, the second magnet M2 may be deflected to any position by changing the relationship of the magnetic force of each magnet. The opening position of the valve body 130 can be arbitrarily set by adjusting the axial length of the valve body accommodating space 114 (or the position of the third magnet holding portion 115) and the magnetic force or number of magnets. The open position shifts to the connection port 110 side according to the strength of the negative pressure.

  FIG. 9 is an exploded perspective view of the vent valve 100. With reference to FIG. 9, a method of manufacturing the vent valve 100 will be described. As shown in FIG. 9, the vent valve main body 110 is formed by combining a cylindrical first member 110a, a cross-shaped second member 110b, and a short cylindrical third member 110c. First, the rib 115a is coupled to the rib coupling portion 111a so that the cross-shaped second member 110b (holding the third magnet M3) is fixed to the cylindrical first member 110a of the vent valve body 110. Subsequently, the valve body 130 is assembled by joining the first substrate 131a, the packing 132, and the second substrate 131b. Then, the second magnet holder 150 is extrapolated to the first shaft portion 135a of the valve body 130, and the first shaft portion 135a is inserted into the shaft hole of the first guide portion 116 of the second member 110b. Subsequently, the third member 110c is assembled to the upper end of the first member 110a. At this time, the second shaft portion 135b of the valve body 130 is inserted through the shaft hole of the second guide portion 117 of the third member 110c, and the male screw portion 111d of the third member 110c is inserted into the female screw portion 111c at the upper end of the first member 110a. Screw together. Thereby, the ventilation valve main body 110 incorporating the valve body 130 is assembled. Further, the cover member 170 is assembled by fixing the shade member 171 and the ventilation member 172, and the cover body 170 is fitted to the upper end of the ventilation valve main body 110. That is, the cover body 170 can be detachably attached to the vent valve main body 110 by fitting the fitting protrusion 111e protruding at the upper end of the vent valve main body 110 into the fixing groove 172b.

  FIG. 10 is a schematic diagram of the piping structure 10 in which the above-described vent valve 100 is connected to the connection end P ′ of the drain pipe P. As shown in FIG. 9, in the piping structure 10, a plurality of drain pipes P are connected to the main pipe under the floor and piped. One of the drain pipes P is connected to a drain port of a drainage facility such as a sink, a bathtub, or a toilet, and has a trap portion curved in an S shape. A connection end P ′ opened downstream of the trap portion is provided. The connection port 119 of the vent valve 100 is connected to the connection end P ′ of the drain pipe P in a sealed state. In the piping structure of the present invention, as shown in FIG. 10, one or a plurality of vent valves can be attached to the piping material, and the position and direction can be arbitrarily set according to the situation. And in the piping structure of this embodiment, since the force which the repulsive force and negative pressure between magnets M1, M2, and M3 act on a valve body is sufficiently larger than gravity, the influence of gravity can be disregarded here. .

  Next, the operation of the vent valve 100 in the piping structure 10 with the vent valve 100 attached will be described with reference to FIG. FIG. 11A shows a form in which the drain pipe P is not in a negative pressure state in the piping structure 10 and the valve body 130 of the vent valve 100 is in the closed position. FIG. 11B shows a form in which the drain pipe P is in a negative pressure state and the valve body 130 of the vent valve 100 is in the open position.

  As shown in FIG. 11A, in a normal closed state where the drain pipe P is not negative pressure, the valve body 130 is biased to the closed position, the packing 132 is brought into close contact with the valve seat 113, and the vent 112 is connected to the valve body 130. It is sealed with. In this closed state, the pressure in the drain pipe P is the same as or greater than the external pressure, and no force in the opening direction acts on the valve body 130 (other than gravity). Alternatively, the negative pressure in the drain pipe P is sufficiently small, and the pressure that the pressure difference between the internal pressure of the drain pipe P and the external pressure acts on the valve body 130 rather than the repulsive force that the second magnet M2 biases the first magnet M1. Is smaller. That is, as long as the urging force due to the magnetic force exceeds the force in the opening direction that acts on the valve body 130, the valve body 130 blocks the vent 112 constantly. And in this piping structure 10, while preventing the malodor which drifts from the downstream of the drain pipe P from leaking indoors, the invasion of the pest which crawls up from the drain pipe P downstream side is also prevented.

  When the negative pressure in the drain pipe P increases from the normal closed state (or the initial state), the valve body accommodating space 114 in the vent valve main body 110 communicating with the drain pipe P similarly has a negative pressure. As a result, a pressure difference occurs between the inside and outside of the vent valve body 110 via the valve body 130 (and the vent 112), and this pressure difference acts to move the valve body 130 in the opening direction. When the force in the opening direction acting on the valve body 130 exceeds the repulsive force between the first magnet M1 and the second magnet M2 in the initial position, the valve body 130 is directed to the opening position along the axial direction of the valve shaft 135. To start moving.

  And as shown in FIG.11 (b), with the movement of the valve body 130, the 1st magnet M1 moves to the 2nd magnet M2 side along an axial direction. The valve body 130 is moved while the second magnet M2 moves along the valve shaft 135 in a direction away from the first magnet M1 so as to suppress an increase in repulsive force between the first magnet M1 and the second magnet M2 accompanying this. Moves to the open position. That is, with the movement of the first magnet M1, the second magnet M2 escapes to the third magnet M3 side. At this time, since the second magnet M2 is biased toward the first magnet M1 by the third magnet M3, the distance (d1) that the first magnet M1 has moved is greater than the distance (d2) that the second magnet M2 has moved. Is also big. The reduced distance between the first magnet M1 and the second magnet M2 is obtained by subtracting the distance (d2) moved by the second magnet M2 from the distance (d1) moved by the first magnet M1. That is, an increase in repulsive force is suppressed (compared to the conventional one) by the distance (d2) that the second magnet M2 has moved in the separation direction. Therefore, in the vent valve 100, the distance between the first magnet M1 and the second magnet M2 is not proportionally reduced according to the moving distance (d1) of the first magnet M1. Thereby, the increase in the repulsive force between the 1st magnet M1 and the 2nd magnet M2 is suppressed effectively. Then, as shown in FIG. 11 (b), the valve body 130 reaches the open position where the valve body 130 is sufficiently opened quickly and surely, and sucks outside air through the vent 112. At this time, the external airflow sucked from the side of the cover body 170 collides with the raised portion 171a of the cap member 171 and is guided to the vent 112 through the opening 172a. As a result, the negative pressure in the drain pipe P is quickly and reliably eliminated.

  Next, when the negative pressure in the drain pipe P is eliminated, the force acting on the valve body 130 due to the negative pressure disappears, and the third magnet M3 as the return means moves the second magnet M2 along the valve shaft 135. To return to the initial position. That is, the second magnet M2 repels the third magnet M3 and lifts the second magnet M2 upward (against gravity). As a result, the second magnet M2 returns to the initial position, and the first magnet M1 is pushed up together with the valve body 130 to the closed position along the axial direction. Then, the valve body 130 is urged to the closed position by the repulsive force between the first magnet M1 and the second magnet M2, and the valve body 130 closes the vent hole 130 again. ) Return to the state. That is, in the piping structure 10, after eliminating the negative pressure in the drain pipe P, each member returns to its original position quickly and reliably.

  Hereinafter, the effect in the ventilation valve 100 and the piping structure 10 of one Embodiment which concerns on this invention is demonstrated.

  According to the vent valve 100 of the present embodiment, when the first magnet M1 and the second magnet M2 approach each other along the axial direction together with the valve body 130, the second magnet M2 repels and escapes from the first magnet M1. Therefore, an increase in repulsive force between the first magnet M1 and the second magnet M2 is effectively suppressed. Until the valve body 130 reaches the open position, the repulsive force from the second magnet M2 acting on the valve body 130 is effectively reduced, and the repulsive force between the first magnet M1 and the second magnet M2 is increased. As a result, the degree to which the opening degree of the valve body 130 is limited can be greatly reduced. As a result, the opening position of the valve body 130 is moved from the vent 112 side to the connection port 119 side in accordance with the strength of the negative pressure, and the opening degree of the valve body 130 at the opening position is increased. Thus, the negative pressure inside the drain pipe P can be quickly eliminated.

  Then, after the outside air is drawn into the drain pipe P and the negative pressure is eliminated, the third magnet M3 returns the second magnet M2 to the initial position as a return means. That is, the repulsive force between the second magnet M2 and the third magnet M3 biases the second magnet M2 toward the first magnet M1, thereby reducing the force acting on the valve element 130 by eliminating the negative pressure. Then, the second magnet M2 is immediately returned to the initial position, and the valve body 130 can be quickly moved to the closed position.

  Further, in the present embodiment, the first magnet M1, the second magnet M2, and the third magnet M3 are aligned along the axial direction of the valve shaft 135, and the moving directions of the first magnet M1 and the second magnet M2 are the valve directions. By being uniquely defined in the axial direction of the shaft 135, the valve body 130 can be repeatedly moved between the open position and the closed position more smoothly and accurately. Moreover, even when the vent valve 100 is tilted, the first, second, and third magnets M1, M2, and M3 along the axial direction of the valve shaft 135 (at least the first and second magnets M1 and M2). Since the valve body 130 is operated by the repulsive force between (b), the influence of gravity can be almost ignored. That is, the possibility that the movement axis of the valve body 135 is inclined and the operation of the valve body 130 is hindered due to the installation angle of the vent valve 100 can be reduced. In addition, since the first, second, and third magnets M1, M2, and M3 are concentrated inside the vent 112, the magnets are more reliably protected by the peripheral wall of the casing 111. Therefore, the vent valve 100 of the present embodiment can operate quickly and accurately, and the negative pressure in the drain pipe P can be more reliably eliminated.

  The present invention is not limited to the above embodiment, and various modifications can be made. Hereinafter, representative examples 2 to 6 of the present invention will be described. In the description of each embodiment, the description of the components common to the first embodiment is omitted, but members having the same two-digit code generally mean the same or similar members.

(Example 2)
Next, a vent valve 200 according to another embodiment of the present invention will be described. FIG. 12 is a cross-sectional view of the vent valve 200. The vent valve 200 of this embodiment includes a vent valve body 210, a valve body 230, a second magnet holder 250, and a cover body 270. The vent valve 200 is configured so that the first magnet M1, the second magnet M2, and the third magnet M3 are disposed above the vent 212, unlike the vent valve 100 of the first embodiment.

  As shown in FIG. 12, a first magnet holding portion 233 is provided at the tip of the second shaft portion 235 b above the valve shaft 235 of the valve body 230. The first magnet M1 is fixed to the first magnet holding part 233. That is, the first magnet M1 is coupled to the valve body 230 via the second shaft portion 235b, and the first magnet M1 can move in the axial direction of the valve shaft 235 together with the valve body 230. A third magnet holding part 215 is formed adjacent to the second guide part 217 above the vent hole 212. The second guide part 217 is connected to the inner wall of the casing part 211 of the vent valve main body 210 by a rib (not shown) in the same manner as the second guide part 117 of the first embodiment. That is, the third magnet M3 is fixed to a predetermined height at the radial center of the vent valve main body 210 by the third magnet holding portion 215. On the other hand, although the 1st guide part 216 is being fixed to the inner wall of the housing | casing part 211 by the rib 216a below the valve body accommodation space 214, it does not have a magnet adjacently. Further, the second magnet holder 250 is disposed between the first magnet holder 233 and the third magnet holder 215 on the second shaft portion 235 b of the valve shaft 235. The valve shaft 235 passes through the shaft hole of the second magnet holding portion 250 in a loosely inserted state, and the second magnet holding body 250 is supported so as to be movable along the valve shaft 235.

  In the vent valve 200 of the present embodiment, the first magnet M1, the second magnet M2, and the third magnet M3 are aligned along the axial direction of the valve shaft 235, and the first magnet M1 extends outward from the vent 212. The third magnet M3 is fixed to the vent valve body 210 between the valve body 230 and the first magnet M1, and the second magnet M2 is fixed to the end of the second shaft portion 235b of the shaft 235. It arrange | positions between the 3rd magnets M3. That is, in the vent valve 200 (unlike the vent valve 100 incorporating the first magnet M1), the first magnet M1 is fixed to the tip of the valve shaft 235 on the vent 232 side and connected to the valve body 230, thereby The first, second and third magnets M 1, M 2 and M 3 were gathered outside the vent 212 in the vent valve body 210. Therefore, the first, second, and third magnets M1, M2, M3 can be easily seen from the outside without disassembling the vent valve 200, and the vent valve 200 is advantageous in terms of maintenance. It is.

  Next, the operation of the vent valve 200 in the piping structure 20 with the vent valve 200 attached will be described with reference to FIG. FIG. 13A shows a form in which the drain pipe P is not in a negative pressure state in the piping structure 20 and the valve body 230 of the vent valve 200 is in the closed position. FIG. 13B shows a mode in which the drain pipe P is in a negative pressure state and the valve body 230 of the vent valve 200 is in the open position.

  As shown in FIG. 13A, in a normal closed state where the drain pipe P is not negative pressure, the valve body 230 is biased to the closed position, the packing 232 is in close contact with the valve seat 213, and the vent 212 is the valve body 230. It is sealed with. When the negative pressure in the drain pipe P increases, a pressure difference is generated inside and outside the vent valve body 210 via the valve body 230 (and the vent 212), and this pressure difference moves the valve body 230 in the opening direction. Acts as follows.

  And as shown in FIG.13 (b), with the movement of the valve body 230, the 1st magnet M1 moves to the 2nd magnet M2 side along an axial direction. The valve body 230 is moved while the second magnet M2 moves along the valve shaft 235 in a direction away from the first magnet M1 so as to suppress an increase in repulsive force between the first magnet M1 and the second magnet M2 accompanying this. Moves to the open position. That is, with the movement of the first magnet M1, the second magnet M2 escapes to the third magnet M3 side. Thereby, like Example 1, the increase in the repulsive force between the 1st magnet M1 and the 2nd magnet M2 is suppressed effectively. As a result, as shown in FIG. 13 (b), the valve body 230 quickly and surely reaches the fully opened position, sucks the outside air through the vent 212, and the negative pressure in the drain pipe P is reached. Relieve pressure.

  When the negative pressure in the drain pipe P is eliminated, the force acting on the valve body 230 due to the negative pressure disappears, and the third magnet M3 as the return means returns the second magnet M2 to the initial position along the valve shaft 235. Let That is, the second magnet M2 repels the third magnet M3 and lifts the second magnet M2 upward (against gravity). Then, the second magnet M2 returns to the initial position, and the first magnet M1 is pushed up together with the valve body 230 to the closed position along the axial direction. As a result, the valve body 230 is urged to the closed position by the repulsive force between the first magnet M1 and the second magnet M2, and the valve body 230 closes the vent 212 again. Return to the closed state. That is, the pipe structure 20 is configured such that each member returns to the original position quickly and reliably after the negative pressure in the drain pipe P is eliminated.

  Therefore, the vent valve 200 and the piping structure 20 of the second embodiment exhibit the same functions and effects as those of the first embodiment. In other words, the positions of the first magnet, the second magnet, and the return means of the present invention are not limited to the inside of the casing, and can be arbitrarily changed.

(Example 3)
A vent valve 300 according to another embodiment of the present invention will be described. FIG. 14 is a cross-sectional view of the vent valve 300. The vent valve 300 of this embodiment includes a vent valve body 310, a valve body 330, a second magnet holder 350, and a cover body 370. As shown in FIG. 14, the vent valve 300 extends the length in the axial direction of the valve body accommodating space 314 and the first shaft portion 335 a of the valve shaft 335 compared to the vent valve 100 of the first embodiment. A fourth magnet M4 is disposed between the second magnet M2 and the third magnet M3. The fourth magnet M4 is held by the fourth magnet holder 360, and the first shaft portion 335a of the valve shaft 335 penetrates the shaft hole of the fourth magnet holder 360 in a loosely inserted state. That is, the fourth magnet M4 is movable along the axial direction between the second magnet M2 and the third magnet M3.

  Since the fourth magnet M4 functions to bias the second magnet M4 to the initial position (the first magnet M1 side), it can also be interpreted as a part of the return means. Then, by disposing the fourth magnet M4 between the second magnet M2 and the third magnet M3, the distance between the first magnet M1 (valve element) and the third magnet M3 (return means) is increased. The movable range of the valve body 330 can be effectively expanded. Further, since the moving direction of the fourth magnet M4 is similarly restricted in the axial direction, the operation does not become complicated no matter how many magnets increase. In the present embodiment, one fourth magnet M4 is added, but a plurality of fourth magnets M4 may be added between the second magnet M2 and the third magnet M3.

Example 4
A vent valve 400 according to another embodiment of the present invention will be described. FIG. 15 is a cross-sectional view of the vent valve 400. The vent valve 400 of this embodiment includes a vent valve body 410, a valve body 430, a second magnet holder 450, and a cover body 470. As shown in FIG. 15, the vent valve 400 differs from the vent valve 100 of the first embodiment in that a spring S is used instead of a magnet as a return means. The spring S is extrapolated to the first shaft portion 435a of the valve shaft 435, and the lower end of the spring S is connected to the first guide portion 416 and the upper end of the spring S is connected to the second magnet holder 450. Has been. That is, the elastic force of the spring S acts on the second magnet holding body 450 instead of the repulsive force of the magnet, so that the spring S biases the second magnet M2 to the initial position. The initial position of the second magnet M2 can be arbitrarily changed by adjusting the strength of the spring S. Thereby, the open position of the valve body 450 can be adjusted.

  In the vent valve 400 of the fourth embodiment, when the negative pressure in the drain pipe P becomes large, a pressure difference is generated between the inside and outside of the vent valve body 410 via the valve body 430 (and the vent 412), and this pressure difference is the valve body. It acts to move 430 in the opening direction. And with the movement of the valve body 430, the 1st magnet M1 moves to the 2nd magnet M2 side along an axial direction. While the second magnet M2 moves along the valve shaft 435 in a direction away from the first magnet M1 so as to suppress an increase in repulsive force between the first magnet M1 and the second magnet M2, the valve body 430 is in the open position. Moving. That is, the spring S is compressed while the second magnet M2 escapes downward against the elastic force of the spring S as the first magnet M1 moves. Thereby, like Example 1, the increase in the repulsive force between the 1st magnet M1 and the 2nd magnet M2 is suppressed effectively. When the negative pressure in the drain pipe P is eliminated, the force acting on the valve body 430 due to the negative pressure disappears, and the elastic return force of the compressed spring S as the return means causes the second magnet M2 to act on the valve shaft 435. To return to the initial position. Accordingly, the second magnet M2 returns to the initial position, and the first magnet M1 is pushed up together with the valve body 430 to the closed position along the axial direction. The valve body 430 is urged to the closed position by the repulsive force between the first magnet M1 and the second magnet M2, and the valve body 430 closes the vent 412 again, thereby returning to the initial (closed) state.

  Accordingly, the fourth embodiment provides a vent valve 400 that can quickly and reliably eliminate the negative pressure in the drain pipe as in the first embodiment. That is, the biasing means of the present invention is not limited to the third magnet, and alternative means can be arbitrarily employed.

(Example 5)
A vent valve 500 according to another embodiment of the present invention will be described. FIG. 16 is a cross-sectional view of the vent valve 500. The vent valve 500 of this embodiment includes a vent valve main body 510, a valve body 530, a second magnet holder 550, and a cover body 570. As shown in FIG. 16, the vent valve 500 is different from the vent valve 100 of the first embodiment in that the valve shaft 535 is fixed to the vent valve main body 510 and is movable along the valve shaft 535 and the second valve body 530. The magnet holder 550 is supported by magnetic force. That is, the valve body 530 and the valve shaft 535 are configured as separate bodies. On the other hand, the 3rd magnet holding | maintenance part 515 is being fixed to the ventilation valve main body 510 through the rib 515a similarly to Example 1. FIG. The valve shaft 535 is fixed to the third magnet holding portion 515 below the valve body 530, and is connected to the inner wall of the housing portion 511 via the rib 515b above the valve body 530. The valve shaft 535 extends in the axial direction at the radial center of the vent valve main body 510.

  In the vent valve 500 of the fifth embodiment, when the negative pressure in the drain pipe P increases, a pressure difference is generated between the inside and outside of the vent valve main body 510 via the valve body 530 (and the vent 512), and this pressure difference is the valve body. It acts to move 530 in the opening direction. As the valve body 530 moves relative to the valve shaft 535, the first magnet M1 moves along the valve shaft 535 toward the second magnet M2. The valve body 530 is moved while the second magnet M2 moves along the valve shaft 535 in a direction away from the first magnet M1 so as to suppress an increase in repulsive force between the first magnet M1 and the second magnet M2 accompanying this. Moves to the open position. That is, the second magnet M2 escapes downward against the repulsive force with the third magnet M3 as the first magnet M1 moves. Thereby, like Example 1, the increase in the repulsive force between the 1st magnet M1 and the 2nd magnet M2 is suppressed effectively. When the negative pressure in the drain pipe P is eliminated, the force acting on the valve body 530 due to the negative pressure disappears, and the third magnet M3 as the return means moves the second magnet M2 along the valve shaft 535 to the initial position. Return to. As a result, the second magnet M2 returns to the initial position, and the first magnet M1 is pushed up along with the valve body 530 along the valve shaft 535 to the closed position. Then, the valve body 530 is urged to the closed position by the repulsive force between the first magnet M1 and the second magnet M2, and the valve body 530 closes the vent hole 512 again, thereby returning to the initial (closed) state.

  Therefore, the fifth embodiment provides a vent valve 500 that can quickly and reliably eliminate the negative pressure in the drain pipe as in the first embodiment. That is, the valve shaft of the present invention may not be integrally formed with the valve body, and the valve body may be moved relative to the valve shaft.

(Example 6)
A vent valve 600 according to another embodiment of the present invention will be described. FIG. 17 is a perspective view of the vent valve 600, and FIG. 18 is a cross-sectional view of the vent valve 600. The vent valve 600 is separated from the first magnet M1 by rotating the second magnet M2 as compared with the above embodiment.

  As shown in FIG. 17, the vent valve 600 of the present embodiment includes a cylindrical vent valve main body 610, a valve body 630 housed in the vent valve main body 610 and incorporating the first magnet M1, and a second magnet M2. A second magnet holder 650 that is rotatably supported, and an annular protective member 670 made of sponge provided at the upper end.

  As shown in FIG. 18 (a), the vent valve body 610 includes a cylindrical casing 611, a connection port 619 formed at the lower end of the casing 611 and connected to the drain pipe P, and the casing. A vent 612 formed in communication with the open end 618 at the upper end of the portion 611. A valve seat 613 that contacts the valve body 630 is provided around the vent 612, and a valve body accommodating space 614 is defined below the vent 612. In addition, a guide groove 621 for guiding the vertical movement of the valve body 630 is formed on the inner wall of the housing portion 611, and a pair of concavities 622 that are opposed to support the second magnet holding body 650 are formed. ing.

  The valve body 630 includes a valve body main body 631 including a first substrate 631a and a second substrate 631b, a packing 632 held between the first substrate 631a and the second substrate 631b, and a radial direction of the valve body 630. A first magnet holding portion 633 that holds the first magnet M1 at the center of the air gap and a guide protrusion 634 (see FIG. 17) that is guided by the guide groove 621 of the vent valve main body 610. In the valve body 630, the packing 632 is exposed on the upper surface of the valve body 630 so as to be able to contact the valve seat 613.

  Further, as shown in FIG. 18B, the second magnet holder 650 includes a short cylindrical holder 651 that holds the second magnet M2, a shaft 652 that extends laterally from the holder 651, And a weight body 653 disposed on the opposite side of the second magnet M2 via the shaft portion 652. The weight body 653 is heavier than the second magnet M2. That is, in the second magnet holding body 650, the weight body 653 functions so as to hang downward through the shaft portion 652 due to gravity. That is, the weight body 653 maintains the magnetic pole of the second magnet M <b> 2 so as to face upward at the radial center of the vent valve body 610.

  In the ventilation valve 600, as shown in FIG. 18B, both ends of the shaft portion 652 of the second magnet holder 650 are disposed in the recess 622 on the inner wall of the housing portion 611. That is, the second magnet holder 650 is pivotally supported by the vent valve main body 610 so as to be rotatable about the shaft 652 as an axis. At this time, due to the weight of the cone 653, the cone 653 is located below the shaft portion 652, and the second magnet M2 is located above. When the vent valve 600 is vertically disposed, the weight body 653 functions as a return unit that urges the second magnet M2 to the initial position facing upward. As a result, the second magnet M2 facing upward and the first magnet M1 of the valve body 630 repel each other, and the valve body 630 is biased to the closed position so as to be pressed against the valve seat 613.

  Next, with reference to FIG. 19, the operation of the vent valve 600 in the piping structure 60 with the vent valve 600 attached will be described. FIG. 19A shows a form in which the drain pipe P is not in a negative pressure state in the piping structure 60 and the valve body 630 of the vent valve 600 is in the closed position. FIG. 19B shows a form in which the drain pipe P is in a negative pressure state and the valve body 630 of the vent valve 600 is in the open position.

  As shown in FIG. 19A, in a normal closed state where the drain pipe P is not negative pressure, the valve body 630 is urged to the closed position, the packing 632 is brought into close contact with the valve seat 613, and the vent 612 is connected to the valve body 630. It is sealed with. When the negative pressure in the drain pipe P increases, a pressure difference is generated inside and outside the vent valve body 610 via the valve body 630 (and the vent 612), and this pressure difference moves the valve body 630 in the opening direction. Acts as follows.

  And as shown in FIG.19 (b), the 1st magnet M1 moves to the 2nd magnet M2 side with the movement of the valve body 630. FIG. While suppressing the increase in repulsive force between the first magnet M1 and the second magnet M2 accompanying this, the magnetic pole of the second magnet M2 rotates about the shaft portion 622 in the direction of escaping from the magnetic pole of the first magnet M1. The valve body 630 moves to the open position. That is, as the first magnet M1 moves, the magnetic pole of the second magnet M2 rotates so as to deviate from the magnetic pole of the first magnet M1. Thereby, like Example 1, the increase in the repulsive force between the 1st magnet M1 and the 2nd magnet M2 is suppressed effectively. As a result, as shown in FIG. 19B, the valve body 630 quickly and surely reaches the open position, sucks outside air through the vent 612, and eliminates the negative pressure in the drain pipe P. .

  When the negative pressure in the drain pipe P is eliminated, the force acting on the valve body 630 due to the negative pressure disappears, and the weight body 653 as the return means rotates so as to hang down, and the second magnet M2 faces upward. To return to the initial position. That is, the cone 653 returns the second magnet M2 to the initial position by gravity. Then, the second magnet M2 returns to the initial position, and the first magnet M1 is pushed up together with the valve body 630 to the closed position along the axial direction. Then, the valve body 630 is urged to the closed position by the repulsive force between the first magnet M1 and the second magnet M2, and the valve body 630 closes the vent hole 612 again. ) Return to the state. That is, in the piping structure 60, after eliminating the negative pressure in the drain pipe P, each member returns to the original position quickly and reliably.

  Accordingly, the sixth embodiment provides a vent valve 600 that can eliminate the negative pressure in the drain pipe more quickly and reliably, as in the first embodiment. That is, in this invention, the form of the 2nd magnet M and a return means can be changed arbitrarily.

(Modification)
The installation method of the wiring / pipe box of the present invention is not limited to the above embodiment, and can be modified as follows, for example.
1) The shape and material of the drain pipe can be arbitrarily changed according to the installation application. For example, although the vent and the connection port are opened coaxially with the valve shaft, the connection port may be opened laterally with respect to the vent.
2) In the embodiment described above, the vent valve is used for the purpose of eliminating the negative pressure of the drain pipe. However, the present invention is not limited to the drainage application, and those skilled in the art can use the present invention for piping for other applications. It can also be applied to materials.
3) You may combine the characteristic component of each Example mentioned above partially, respectively.

  The present invention is not limited to the above-described embodiments and modifications, and can be implemented in various modes as long as they belong to the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Piping structure 100 Ventilation valve 110 Ventilation valve main body 111 Housing | casing part 112 Venting hole 113 Valve seat 114 Valve body accommodation space 115 Third magnet holding part 116 First guide part 117 Second guide part 118 Opening end part 119 Connection port 130 Valve Body 131 Valve body 132 Packing 133 First magnet holding part 135 Valve shaft 135a First shaft part 135b Second shaft part 150 Second magnet holding body 170 Cover body 600 Ventilation valve 650 Second magnet holding body 652 Shaft part 653 Weight body M1 1st magnet M2 2nd magnet M3 3rd magnet (return means)
M4 4th magnet S Spring (return means)
P Drain pipe P 'connection end

Claims (3)

A vent valve body having a connection port connected to the piping material and a ventilation port for introducing outside air into the piping material;
A valve body that moves from a closed position of the vent to an open position when the piping material becomes negative pressure;
A cover body attached to the vent valve body,
The cover body is a cap member having a cap shape covering the vent hole, and is attached to one end of the vent valve main body, and is open to the side and opens on the vent port side of the cap member. A ventilation member for fixing the cap member;
The cap member has a raised portion that protrudes toward the vent at a substantially center of the cap member so as to guide the air flowing from the side between the cap member and the vent member to the vent. Provided ,
The ventilation valve is characterized in that the ventilation member is formed of an annular plate body that is opened at the center and whose opening periphery is raised toward the shade member side . A vent valve body having a connection port connected to the piping material and a ventilation port for introducing outside air into the piping material;
A valve shaft extending in the axial direction inside the vent valve body;
A valve body that moves along the axial direction of the valve shaft from the closed position of the vent hole to the open position when the piping material becomes negative pressure;
A first magnet coupled to the valve body;
A second magnet that is movably supported along the valve shaft at a position separated from the first magnet, repels the first magnet at an initial position, and biases the valve body to the closed position;
Returning means for returning the second magnet to the initial position;
A cover body attached to the vent valve body,
When the piping material becomes negative pressure, the first magnet moves toward the second magnet as the valve body moves, and the second magnet is moved by the repulsive force between the first magnet and the second magnet. By moving along the valve shaft in a direction away from the first magnet, the valve body is disposed at the open position,
When the negative pressure of the piping material is eliminated, the return means returns the second magnet to the initial position, and attaches the valve body to the closed position by the repulsive force between the first magnet and the second magnet. Forcefully close the vent valve,
The cover body is a cap member having a cap shape covering the vent hole, and is attached to one end of the vent valve main body, and is open to the side and opens on the vent port side of the cap member. A ventilation member for fixing the cap member;
The cap member has a raised portion that protrudes toward the vent at a substantially center of the cap member so as to guide the air flowing from the side between the cap member and the vent member to the vent. Provided ,
The ventilation valve is characterized in that the ventilation member is formed of an annular plate body that is opened at the center and whose opening periphery is raised toward the shade member side . A piping structure in which piping material is piped, wherein the vent valve according to claim 1 or 2 is connected to a connection end of the piping material through a connection port so as to eliminate negative pressure in the piping material. Piping structure characterized by that.

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