JP2017044224A - Vent valve for drain pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a sealability at the time of valve closing to be increased and a valve opening action to be rapidly carried out.SOLUTION: A vent valve 10 includes a cylindrical case 20 having inclined planes 25 of which inner diameters are expanded toward an upper part opening end 28 and having valve ports 26 formed at the inclined planes 25 to communicate inside and outside of them; a valve body 30 having a base end part 31 with an arc shape along an inner peripheral edge of the upper part opening end 28 of the case 20 and fixed to the upper part opening end 28 and having an inclined part 32 arranged on the inclined planes 25; and a cap 40 fixed to the upper opening of the case 20 to form a valve chamber together with the case 20 and the valve body 30. The valve body 30 is constituted to close the valve ports 26 by the inclined part 32 seated on the inclined planes 25 with its resilient force and in turn enables the valve ports 26 to be released under its resilient deformation to cause corners 333 of the inclined part 32 to be lifted up due to a pressure difference between a pressure within the valve chamber and an outside pressure.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a drain pipe vent valve.

  Conventionally, a vent pipe extending upward is connected to a middle of a drain pipe of a building or the like, and a vent valve for adjusting a pressure in the drain pipe is provided at an upper end portion of the vent pipe (for example, Patent Documents). 1).

  The vent valve described in Patent Document 1 includes a connection pipe connected to the upper end of the vent pipe. The upper part of the connecting pipe is provided with an annular wall whose diameter is expanded toward the upper opening end, and a plurality of valve ports communicating with the inside and outside of the annular wall are formed at intervals in the circumferential direction. Yes. In the valve seat which is the inner peripheral surface of the annular wall, a plurality of fan-shaped valve bodies that close two valve ports adjacent in the circumferential direction are arranged in the circumferential direction. A protruding plate is provided above the valve opening in the valve seat, and the protruding plate is inserted into a through hole formed in the base end portion of the valve body. A valve box is attached to the upper opening of the connection pipe, and a valve chamber is formed by the valve box, the connection pipe and the valve body.

  According to the vent valve described in Patent Document 1, when negative pressure is generated in the drain pipe during drainage or the like, and the pressure inside the valve chamber becomes lower than the external pressure, the valve body starts from its base end. As a result of the swing, the valve port is opened. Thereby, the outside air is introduced into the valve chamber through the valve port, whereby the pressure inside the valve chamber, that is, the pressure inside the drain pipe is increased, and the negative pressure is relieved.

Japanese Patent Laid-Open No. 10-103549

  By the way, in the case of the ventilation valve of patent document 1, each valve body has comprised fan-plate shape, and the upper end edge and the lower end edge have comprised the circular arc shape, respectively. However, since each valve body has a flat plate shape, the valve body only rests on the valve seat when the valve is closed, the degree of adhesion between the valve body and the valve seat is low, and the sealing performance is low.

  Further, in this vent valve, the entire lower end edge of the valve body is swung from the base end portion, that is, the valve opening is opened by being lifted up. Therefore, a large force is required to lift the valve body, causing problems such as a delay in valve opening operation.

  An object of the present invention is to provide a vent valve that can improve the sealing performance when the valve is closed and can quickly perform the valve opening operation.

  A drain pipe vent valve for achieving the above object has an inclined surface whose inner diameter is enlarged toward the upper opening end, and a cylindrical case in which a valve port communicating inside and outside is formed on the inclined surface; A valve body having a shape along an inner peripheral edge of the upper opening end of the case and having a base end portion fixed to the upper opening end, and an inclined portion disposed on the inclined surface; and an upper portion of the case A cap that is attached to an opening and forms a valve chamber with the case and the valve body, and the valve body closes the valve opening by the inclined portion being seated on the inclined surface by an elastic force. On the other hand, due to the pressure difference between the pressure in the valve chamber and the external pressure, the valve port is opened by elastically deforming so that the corner formed by the circumferential edge and the tip edge of the inclined portion is lifted It is configured to be possible.

  According to this configuration, since the base end portion of the valve body has a shape along the inner peripheral edge of the upper opening end of the case and is fixed to the upper opening end, the shape of the entire inclined portion of the valve body is the inclined surface of the case. It becomes easy to follow. The inclined portion is seated on the inclined surface of the case by the elastic force, thereby closing the valve port. For this reason, the inclined portion of the valve body comes into close contact with the inclined surface of the case, and the sealing performance when the valve is closed can be improved.

  Further, when the pressure in the valve chamber becomes lower than the external pressure and the pressure difference becomes large, the valve chamber is elastically deformed so that the corner portion of the inclined portion of the valve body is lifted. Thereby, the valve opening in which the corner portion is closed is opened. As described above, according to the above configuration, the entire distal end edge of the valve body is not lifted, but the corner portion is lifted, so that a portion of the inclined portion that is elastically deformed can be small. Therefore, the valve opening operation can be performed quickly.

In the drain pipe vent valve, the base end portion of the valve body is preferably sandwiched between the upper opening end of the case and the cap.
According to this configuration, the base end portion of the valve body can be easily and reliably fixed to the upper opening end of the case by sandwiching the base end portion of the valve body between the upper opening end of the case and the cap. .

  In the drain pipe vent valve, the inclined surface of the case is formed with a plurality of valve openings at intervals in the circumferential direction, and the base end portion of the valve body has an annular shape, The inclined portion of the valve body preferably has a plurality of divided portions that are divided in the circumferential direction corresponding to the plurality of valve ports.

According to this configuration, the number of valve bodies is one. Therefore, the number of parts of the vent valve can be reduced, and the valve body can be easily assembled to the case.
In the drain pipe vent valve, notches are respectively formed between the divided portions adjacent to each other in the circumferential direction of the inclined portion, and a plurality of ribs are spaced apart in the circumferential direction on the inclined surface of the case. Preferably, the plurality of ribs protrude through the notches to the inner peripheral side with respect to the divided portion.

According to this configuration, the valve body can be easily positioned with respect to the case. Therefore, the valve body can be easily assembled to the case.
In the drain pipe vent valve, when one circumferential edge of one of the plurality of ribs is in contact with the divided portion of the inclined portion, both circumferential edges of the other rib It is preferable that the plurality of ribs and the plurality of notches are respectively formed so that a gap is formed between the inclined portion and the divided portion.

  When the valve body is assembled at a position shifted in the circumferential direction from the normal position on the inclined surface of the case, there is a possibility that the dividing portion of the inclined portion abuts against the rib of the case and the opening / closing operation thereof is not smoothly performed.

In this regard, according to the above configuration, it is possible to avoid that all the divided portions of the inclined portion abut on the rib. Therefore, the reliability of the opening / closing operation of the vent valve can be improved.
In the drain pipe vent valve, the plurality of divided portions have the same shape, the plurality of cutout portions have the same shape, and the circumferential direction of one of the plurality of ribs Is preferably larger than the circumferential width of the other ribs.

  According to this configuration, since the plurality of divided portions have the same shape and the plurality of notches have the same shape, the valve body can be easily aligned with the case. In addition, since the circumferential width of one rib among the plurality of ribs is larger than the circumferential width of the other rib, the edge of one relatively large rib is the divided portion of the inclined portion. When the abutment is made, a gap is formed between both edges of the other rib having a relatively small width and the divided portion of the inclined portion. Therefore, it can avoid that all the division parts of an inclination part contact | abut to a rib, and can improve the reliability of the opening / closing operation | movement of a vent valve.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to improve the sealing performance at the time of valve closing, valve opening operation | movement can be performed rapidly.

The exploded perspective view of a vent valve about a 1st embodiment of the vent valve for drain pipes. The top view of the case in the embodiment. (A) is a top view of the valve body of the embodiment, (b) is a side view of the valve body. (A) is sectional drawing of a valve body, (b) is sectional drawing of a case. Sectional drawing of the state in the middle of attaching a valve body to a case. The top view of the ventilation valve in the state where the cap in the embodiment is not attached. The perspective view of the cap of the embodiment. Sectional drawing along line 8-8 in FIG. Sectional drawing along line 9-9 in FIG. It is a figure explaining the effect | action of the embodiment, Comprising: The perspective view of the vent valve of a valve closing state. It is a figure explaining the effect | action of the embodiment, Comprising: The perspective view of the vent valve of a valve opening state. The top view of the ventilation valve in the state where the cap in 2nd Embodiment is not attached. Sectional drawing of the vent valve in 3rd Embodiment. The top view of the case in 4th Embodiment. The top view of the valve body of the embodiment. It is a figure explaining the effect | action of the embodiment, Comprising: The perspective view of the vent valve of a valve closing state. It is a figure explaining the effect | action of the embodiment, Comprising: The perspective view of the vent valve of a valve opening state.

<First Embodiment>
The first embodiment will be described below with reference to FIGS.
As shown in FIG. 1, a drain pipe vent valve (hereinafter referred to as a vent valve 10) includes a cylindrical case 20, a cap 40 attached to an upper opening of the case 20, and a valve provided between the case 20 and the cap 40. And a body 30. The case 20 and the cap 40 are made of a hard synthetic resin material.

<Case 20>
As shown in FIGS. 1, 2, 4 (b), 8, and 9, the case 20 has an outer cylinder portion 21 that extends vertically and an inner peripheral surface of an upper end portion of the outer cylinder portion 21 that faces downward. The outer cylinder part 21 and the inner cylinder part 22 which makes a double pipe, and the enlarged diameter part 24 extended upwards from the upper end of the outer cylinder part 21 are provided. As shown in FIG. 4B, an annular recess 23 is formed between the outer cylinder part 21 and the inner cylinder part 22.

  As shown in FIGS. 1 and 4B, the enlarged diameter portion 24 has an inclined surface 25 whose inner diameter is enlarged toward the upper opening end 28. The internal space surrounded by the inclined surface 25 has an inverted truncated cone shape.

  As shown in FIGS. 1, 2, 4 (b), 8, and 9, the inclined surface 25 has five first ribs 271 and one second rib 272 that are long in the axial direction. Conveniently, six ribs 271 and 272 are projected at equal angular intervals (60 degrees) in the circumferential direction. In the present embodiment, the lengths of the ribs 271 and 272 along the axial direction are the same, while the circumferential width of the second rib 272 is larger than the circumferential width of the first rib 271. Yes.

  As shown in FIGS. 1 and 2, a plurality of (three in this embodiment) valve ports 26 communicating with the inside and outside of the case 20 are spaced in the circumferential direction between the ribs 271 and 272 adjacent to each other in the circumferential direction. Each is formed.

As shown in FIGS. 1, 2, and 8, each valve port 26 has a tapered shape in which the opening area on the inner peripheral surface side is larger than the opening area on the outer peripheral surface side.
A flange portion 281 is formed on the outer periphery of the upper opening end 28 of the case 20 over the entire circumference. On the outer peripheral surface of the flange portion 281, three engagement convex portions 29 are formed at equal angles (120 degrees) in the circumferential direction.

<Valve 30>
As shown in FIGS. 1, 3 (a), 3 (b), 4 (a), 8, and 9, the valve body 30 has an annular shape along the upper opening end 28 of the case 20. And a base end portion 31 disposed on the upper opening end 28 and an inclined portion 32 having a substantially cylindrical shape with a diameter reduced from the base end side toward the front end side and disposed on the inclined surface 25 of the case 20. And have.

  As shown in FIGS. 4A and 4B, the inclination angle α of the inclined portion 32 with respect to the central axis of the valve body 30 is made smaller than the inclination angle β of the inclined surface 25 with respect to the central axis of the case 20. (Α <β). In FIG. 4A, a two-dot chain line parallel to the central axis of the valve body 30 is shown.

  The valve body 30 is formed of an elastic material such as synthetic rubber. The synthetic rubber forming the valve body 30 is preferably, for example, ethylene / propylene / diene co-rubber rubber (EPDM) or silicone rubber.

The base end portion 31 has an annular folded portion 311 that is folded back to the outer peripheral surface side of the flange portion 281 of the case 20.
A plurality (six in this embodiment) of notches 34 extending in the axial direction from the front end edge 332 are formed in the inclined portion 32 at equiangular (60 degrees) intervals in the circumferential direction. The circumferential widths of the plurality of notches 34 are set to be the same. The circumferential widths of the plurality of notches 34 are set to be the same as each other, and are larger than the circumferential width of the second rib 272. Accordingly, the inclined portion 32 is formed with a plurality of (six in this embodiment) divided portions 33 that are divided in the circumferential direction and have the same shape.

  As shown in FIGS. 6, 8, and 9, the ribs 271 and 272 protrude through the notch 34 toward the inner peripheral side with respect to the divided portion 33. Thus, the valve body 30 is positioned with respect to the case 20.

Each divided portion 33 closes the three valve ports 26 located between the ribs 271 and 272 adjacent to each other in the circumferential direction.
<Cap 40>
As shown in FIGS. 1 and 7 to 9, the cap 40 has a cylindrical peripheral wall 41 and a top wall 42 provided at one end of the peripheral wall 41. A stepped portion 43 is provided between the peripheral wall 41 and the top wall 42 of the cap 40 by reducing the diameter of the inner peripheral surface from the peripheral wall 41 toward the top wall 42.

  As shown in FIGS. 8 and 9, the inner peripheral surface of the peripheral wall 41 faces the outer peripheral surface of the flange portion 281 of the case 20 and the outer peripheral surface of the folded portion 311 of the base end portion 31 of the valve body 30. Further, the base end portion 31 of the valve body 30 is sandwiched between the stepped portion 43 and the upper opening end 28 of the case 20. As a result, the base end portion 31 of the valve body 30 is fixed to the upper opening end 28.

  As shown in FIGS. 7 and 8, on the inner peripheral surface of the cap 40, three engaging recesses 44 that respectively engage with the engaging protrusions 29 of the case 20 are equiangular (120 degrees) spaced in the circumferential direction. Is formed. In addition, three protrusions 45 are formed on the outer peripheral surface of the cap 40 corresponding to the positions where the three engagement recesses 44 are formed. These protrusions 45 are marks for grasping the position of the engaging recess 44 from the outer peripheral side of the cap 40.

As shown in FIGS. 8 and 9, the valve chamber 11 is formed by the inner peripheral surface of the case 20, the inner peripheral surface of the valve body 30, and the inner surface of the top wall 42 of the cap 40.
As shown in FIGS. 8 and 9, when the vent valve 10 is fixed to the vent pipe 51 extending upward from a drain pipe (not shown), the outer periphery of the case 20 is attached to the outer peripheral surface of the upper end portion of the vent pipe 51. By fitting the inner peripheral surface of the tube portion 21, the upper end portion of the vent pipe 51 is inserted into the annular recess 23 of the case 20. Note that an adhesive is applied between the inner peripheral surface of the outer cylindrical portion 21 of the case 20 and the outer peripheral surface of the upper end portion of the vent pipe 51.

  In such a vent valve 10, the inclination angle α of the inclined portion 32 of the valve body 30 with respect to the central axis of the case 20 is smaller than the inclination angle β of the inclined surface 25 of the case 20 with respect to the central axis of the case 20. Therefore, as shown in FIG. 5, when the inclined portion 32 of the valve body 30 is placed on the inclined surface 25 of the case 20, the inclined portion 32 is elastically deformed toward the inner peripheral side by the inclined surface 25. . Therefore, as shown in FIGS. 8 and 9, the inclined portion 32 is seated on the inclined surface 25 by this elastic force.

  Further, the vent valve 10 is formed by a circumferential edge 331 and a leading edge 332 in the divided portion 33 (inclined portion 32) of the valve body 30 due to a pressure difference between the pressure in the valve chamber 11 and the external pressure. The valve body 30 is configured to be able to open the valve port 26 by elastically deforming so that the corner portion 333 is lifted.

Next, the operation of this embodiment will be described.
As shown in FIG. 10, the base end portion 31 of the valve body 30 has an arc shape along the inner peripheral edge of the upper opening end 28 of the case 20 and is fixed to the upper opening end 28. The shape of the whole 32 becomes easy to follow along the inclined surface 25 of the case 20. The inclined portion 32 is seated on the inclined surface 25 of the case 20 by the elastic force, thereby closing the valve port 26. For this reason, the inclined portion 32 of the valve body 30 comes into close contact with the inclined surface 25 of the case 20, and the sealing performance when the valve is closed is improved.

  Further, as shown in FIG. 11, when the pressure in the drain pipe (not shown) becomes low, the pressure in the valve chamber 11 becomes lower than the external pressure, and the pressure difference becomes large, the divided portion 33 (inclination of the valve body 30). The corner portion 333 of the portion 32) is elastically deformed so as to be lifted. Thereby, the valve port 26 in which the corner portion 333 is closed is opened. As described above, according to the present embodiment, the entire distal end edge of the valve body is not lifted, but the corner portion 333 is lifted, so that the portion of the inclined portion 32 that is elastically deformed can be small. Therefore, the valve opening operation is promptly performed.

  By the way, when the circumferential width of the plurality of ribs 271 and 272 is set to be the same, when the valve body 30 is assembled at a position shifted in the circumferential direction from the normal position on the inclined surface 25 of the case 20, There is a possibility that the dividing portion 33 contacts the ribs 271 and 272 of the case 20 so that the opening / closing operation is not smoothly performed.

  In this regard, in the present embodiment, when one circumferential edge of the second rib 272 is in contact with the divided portion 33 of the valve body 30, both circumferential edges of the first rib 271 and the valve body 30. A plurality of ribs 271 and 272 and a plurality of notches 34 are formed so that a gap is formed between each of the divided portions 33. For this reason, it can avoid that all the division parts 33 of the inclination part 32 contact | abut to the ribs 271 and 272, and the reliability of the opening / closing operation | movement of the vent valve 10 can be improved.

According to the vent valve according to the present embodiment described above, the following effects can be obtained.
(1) The valve body 30 has an arc shape along the inner peripheral edge of the upper opening end 28 of the case 20 and is fixed to the upper opening end 28, and an inclined portion disposed on the inclined surface 25. 32. In addition, the valve portion 30 is closed by the elastic member so that the inclined portion 32 is seated on the inclined surface 25, thereby closing the valve opening 26, while the inclined portion 32 is caused by the pressure difference between the pressure in the valve chamber 11 and the external pressure. The valve port 26 can be opened by elastically deforming so that the corner portion 333 formed by the circumferential edge 331 and the tip edge 332 is lifted.

  According to such a configuration, the inclined portion 32 of the valve body 30 is in close contact with the inclined surface 25 of the case 20, and the sealing performance when the valve is closed can be improved. Further, since the elastically deformed portion (corner portion 333) of the inclined portion 32 may be small, the valve opening operation can be performed quickly. Therefore, the sealing performance when the valve is closed can be improved, and the valve opening operation can be performed quickly.

  (2) The base end portion 31 of the valve body 30 is sandwiched between the upper opening end 28 of the case 20 and the cap 40. For this reason, the base end portion 31 of the valve body 30 can be easily and reliably fixed to the upper opening end 28 of the case 20.

  (3) The base end portion 31 of the valve body 30 has an annular shape. The inclined portion 32 of the valve body 30 has a plurality of divided portions 33 that are divided in the circumferential direction corresponding to the plurality of valve ports 26. According to such a configuration, the number of valve bodies 30 is one. Therefore, the number of parts of the vent valve 10 can be reduced, and the valve body 30 can be easily assembled to the case 20.

  (4) The plurality of ribs 271 and 272 protrude through the cutout portion 34 toward the inner peripheral side with respect to the divided portion 33. According to such a configuration, the valve body 30 can be easily positioned with respect to the case 20. Therefore, the valve body 30 can be easily assembled to the case 20.

  (5) When one edge in the circumferential direction of one rib 272 of the plurality of ribs 271 and 272 is in contact with the divided portion 33 of the inclined portion 32, both edges in the circumferential direction of the other rib 271 A plurality of ribs 271 and 272 and a plurality of cutout portions 34 are formed so that a gap is formed between the inclined portion 32 and the divided portion 33.

  According to such a configuration, it is possible to avoid that all the divided portions 33 of the inclined portion 32 come into contact with the ribs 271 and 272, so that the reliability of the opening / closing operation of the vent valve 10 can be improved.

  (6) The plurality of divided portions 33 have the same shape as each other, the plurality of cutout portions 34 have the same shape as each other, and the circumferential direction of one rib 272 of the plurality of ribs 271 and 272 is The width is larger than the circumferential width of the other ribs 271.

  According to such a configuration, since the plurality of divided portions 33 have the same shape and the plurality of notches 34 have the same shape, the positioning of the valve body 30 with respect to the case 20 can be easily performed. it can. Further, since the circumferential width of one rib 272 of the plurality of ribs 271 and 272 is larger than the circumferential width of the other ribs 271, the edge of one relatively large rib 272 is formed. Is in contact with the divided portion 33 of the inclined portion 32, a gap is formed between both edges of the other rib 271 having a relatively small width and the divided portion 33 of the inclined portion 32. Therefore, it can avoid that all the division parts 33 of the inclination part 32 contact | abut to the ribs 271 and 272, and the reliability of the opening / closing operation | movement of the vent valve 10 can be improved.

Second Embodiment
Hereinafter, with reference to FIG. 12, the second embodiment will be described focusing on differences from the first embodiment.

In addition, about the structure which is the same as that of the structure of 1st Embodiment, or corresponds, the same description is attached | subjected and the overlapping description is abbreviate | omitted.
As shown in FIG. 12, three ribs 271 protrude from the inclined surface 25 of the case 20 at equal angular intervals (120 degrees) in the circumferential direction. In the present embodiment, the lengths of these ribs 271 along the axial direction are set to be the same. Further, the circumferential widths of these ribs 271 are set to be the same.

Between the ribs 271 adjacent to each other in the circumferential direction, a plurality (eight in this embodiment) of valve ports 26 are formed at intervals in the circumferential direction.
The inclined portion 32 of the valve body 30 is formed with a plurality of (three in the present embodiment) cutout portions 34 extending in the axial direction from the tip edge 332 thereof at equal intervals (120 degrees) in the circumferential direction. Yes. The circumferential widths of the plurality of notches 34 are set to be the same as each other, and are larger than the circumferential width of the rib 271. Therefore, the inclined portion 32 is formed with a plurality of (three in the present embodiment) divided portions 33 that are divided in the circumferential direction and have the same shape.

Each divided portion 33 closes the eight valve ports 26 positioned between the ribs 271 adjacent to each other in the circumferential direction.
Further, in the present embodiment, a corner portion 333 (a triangle indicated by a two-dot chain line in FIG. 12) formed by the circumferential edge 331 and the tip edge 332 in the divided portion 33 (inclined portion 32) of the valve body 30. ) Is thinner than the other parts of the divided portion 33.

According to the vent valve according to the present embodiment described above, in addition to the effects (1) to (6) of the first embodiment, the following functions and effects can be newly obtained.
(7) The thickness of the corner portion 333 in the divided portion 33 is made thinner than other portions. For this reason, the corner | angular part 333 becomes easy to elastically deform. Therefore, the valve opening operation of the valve body 30 can be performed more promptly.

<Third Embodiment>
Hereinafter, the third embodiment will be described with a focus on differences from the first embodiment with reference to FIG. 13.

In addition, about the structure which is the same as that of the structure of 1st Embodiment, or corresponds, the same description is attached | subjected and the overlapping description is abbreviate | omitted.
As shown in FIG. 13, a concave portion 241 that is recessed toward the outer peripheral side with respect to the inclined surface 25 is formed on the inner peripheral surface of the enlarged diameter portion 24 of the case 20. The concave portion 241 is located at a central portion between the ribs 271 and 272 adjacent in the circumferential direction.

According to the vent valve according to the present embodiment described above, the following operational effects can be obtained in addition to the effects (1) to (6) of the first embodiment.
(8) A recess 241 is formed on the inner peripheral surface of the enlarged diameter portion 24 of the case 20. For this reason, a gap is partially formed between the outer peripheral surface of the divided portion 33 of the valve body 30 and the enlarged diameter portion 24 of the case 20 by the concave portion 241. As a result, when the pressure in the drain pipe (not shown) becomes high, the pressure in the valve chamber 11 becomes higher than the external pressure, and the pressure difference becomes large, the central portion in the circumferential direction of the dividing portion 33 swells into the recess 241. The corner portion 333 of the dividing portion 33 is lifted by the reaction. Thereby, the valve port 26 in which the corner portion 333 is closed is opened. Therefore, the valve body 30 can be opened not only when the pressure in the valve chamber 11 becomes low but also when the pressure becomes high.

<Fourth embodiment>
Hereinafter, with reference to FIGS. 14 to 17, the fourth embodiment will be described focusing on differences from the second embodiment.

In addition, about the structure which is the same as that of the structure of 2nd Embodiment, or respond | corresponds, the overlapping description is abbreviate | omitted by attaching | subjecting the same code | symbol.
As shown in FIG. 14, between the pair of ribs 271 adjacent to each other in the circumferential direction, four first valve ports 261 and one second valve port 262 having a larger width in the circumferential direction than the first valve port 261. , And one first valve port 261 is formed at intervals in the circumferential direction. The shape and position of the first valve port 261 match the shape and position of the corresponding valve port 26 in the second embodiment. The outer shape of the second valve port 262 matches the outer shape of the three valve ports 26 arranged in the circumferential direction of the second embodiment. Therefore, the opening area of the second valve port 262 is three times or more than the opening area of the first valve port 261.

  As shown in FIG. 15, the portion corresponding to the second valve port 262 in one divided portion 33 of the valve body 30, that is, the central portion in the circumferential direction of the divided portion 33 is thicker than the other portions in the divided portion 33. A thin thin portion 334 is formed. Therefore, as shown in FIG. 16, the thin portion 334 faces the second valve port 262. In addition, in the valve body 30 of this embodiment, the thickness of the corner | angular part 333 of the division part 33 is not made thinner than another site | part. In the present embodiment, unlike the second embodiment, the thickness of the corner portion 333 in the dividing portion 33 is the same as the other portions in the dividing portion 33.

Next, the operation of this embodiment will be described.
When the pressure in the drain pipe (not shown) becomes high, the pressure in the valve chamber 11 becomes higher than the external pressure and the pressure difference increases, as shown in FIG. It bulges into the mouth 262 and the corner portion 333 of the dividing portion 33 is lifted by the reaction. Thereby, the 1st valve port 261 in which the corner | angular part 333 was obstruct | occluded is open | released. Therefore, the valve opening operation can be performed more quickly.

According to the ventilation valve which concerns on this embodiment demonstrated above, there can exist an effect according to the effect (1)-(6) of 1st Embodiment, and the effect (8) of 3rd Embodiment.
<Modification>
In addition, the said embodiment can also be changed as follows, for example.

-In 1st Embodiment and 4th Embodiment, the thickness of the corner | angular part 333 in the division part 33 of the valve body 30 can also be made thin compared with the other site | part of the division part 33 similarly to 2nd Embodiment. .
For example, in 1st Embodiment, the valve opening 26 located in the center among the three valve openings 26 located between the ribs 271 and 272 adjacent to each other in the circumferential direction can be omitted. That is, the valve port 26 may be formed at a portion that is opened and closed by the corner portion 333 in the divided portion 33 of the valve body 30.

  8 and 9, by inserting the outer peripheral surface of the outer cylinder portion 21 of the case 20 into the inner peripheral surface of the upper end portion of the vent pipe 51, the vent pipe 51 is ventilated. The valve 10 can also be fixed. In this case, the insect is prevented from entering between the inclined surface 25 of the case 20 and the valve body 30 because the annular recess 23 serves as a barrier when the insect tries to climb up the inner peripheral surface of the vent pipe 51. be able to.

  -The number (partition number) of the division parts 33 of the valve body 30 is not limited to the number illustrated in the said embodiment. For example, as shown in Table 1, it is preferable to set the number of divisions according to the pipe diameter (outer diameter) of the vent pipe 51.

  Table 1 shows the relationship between the pipe diameter of the vent pipe 51 and the preferable number of division parts 33 (number of divisions).

The number of divisions is based on parameters such as the thickness of the valve body 30, the hardness of the valve body 30, the length of the inclined portion 32, the inclination angle α of the inclined portion 32, and the circumferential length of the inner peripheral edge of the proximal end portion 31. Is derived.

-The shape and magnitude | size of the some division | segmentation part 33 can also be varied mutually.
The shape and size of the plurality of notches 34 can be made different from each other.
-Although the notch part 34 was formed between the division parts 33 mutually adjacent in the circumferential direction in the inclination part 32, it may replace with the notch part 34 and you may make it form a notch. In this case, the ribs 271 and 272 of the case 20 may be omitted.

  -The valve body should just be formed with the material which can be elastically deformed, for example, can also be formed with thin plate-like stainless steel, aluminum, etc. In this case, the corrosion resistance and durability of the valve body can be improved, and the reliability of the valve function of the vent valve can be improved.

  The valve body may be formed of a composite material including a hard material such as a metal material and a soft material such as synthetic rubber that is softer than the hard material. In this case, a portion of the valve body that does not contribute to the opening / closing operation at the base end portion or the inclined portion (a portion not including the corner portion) fixed to the case is formed of a hard material, while contributing to the opening / closing operation at the inclined portion. The portion (including the corner portion), that is, the portion exhibiting the valve function is preferably formed of a soft material. According to such a valve body, the shape of the base end portion and the like of the valve body can be easily maintained, so that the assembly of the valve body to the case can be improved, and the portion contributing to the opening / closing operation of the inclined portion is elastic. The valve function can be easily exhibited by being easily deformed.

A plurality of independent valve bodies can be provided for each portion located between the ribs 271 and 272 adjacent to each other in the circumferential direction on the inclined surface 25.
Only one valve port 26 can be formed on the inclined surface 25 of the case 20.

  -The base end part of a valve body is not limited to what is clamped by the upper opening end of a case, and a cap. In addition, for example, the base end portion of the valve body may be fixed to the upper opening end of the case by a fixing member different from the cap.

  DESCRIPTION OF SYMBOLS 10 ... Ventilation valve, 11 ... Valve chamber, 20 ... Case, 21 ... Outer cylinder part, 22 ... Inner cylinder part, 23 ... Annular recessed part, 24 ... Expanded diameter part, 241 ... Recessed part, 25 ... Inclined surface, 26 ... Valve port , 261 ... 1st valve opening, 262 ... 2nd valve opening, 271 ... 1st rib, 272 ... 2nd rib, 28 ... Upper opening end, 281 ... Flange part, 29 ... Engaging convex part, 30 ... Valve body, 31 ... Base end portion, 311 ... Folded portion, 32 ... Inclined portion, 33 ... Dividing portion, 331 ... Edge in circumferential direction, 332 ... End edge, 333 ... Corner portion, 34 ... Notch portion, 40 ... Cap, 41 ... Peripheral wall , 42 ... top wall, 43 ... stepped portion, 44 ... engaging recess, 45 ... ridge, 51 ... vent pipe.

Claims (6)

A cylindrical case having an inclined surface whose inner diameter is enlarged toward the upper opening end, and a valve port that communicates the inside and the outside with the inclined surface;
A valve body having a shape along the inner peripheral edge of the upper opening end of the case and having a base end portion fixed to the upper opening end, and an inclined portion disposed on the inclined surface;
A cap that is attached to the upper opening of the case and forms a valve chamber with the case and the valve body;
The valve body closes the valve port by seating the inclined portion on the inclined surface by an elastic force, while the circumferential direction in the inclined portion is caused by a pressure difference between the pressure in the valve chamber and the external pressure. It is configured to be able to open the valve port by elastically deforming so that the corner formed by the edge and the tip edge is lifted,
Drain pipe vent valve. The base end portion of the valve body is sandwiched between the upper opening end of the case and the cap.
The drainage pipe vent valve according to claim 1. A plurality of the valve openings are formed at intervals in the circumferential direction on the inclined surface of the case,
The base end of the valve body has an annular shape,
The inclined portion of the valve body has a plurality of divided portions divided in the circumferential direction corresponding to the plurality of valve ports,
The drainage pipe vent valve according to claim 1 or 2. Notches are respectively formed between the divided portions adjacent to each other in the circumferential direction in the inclined portion,
A plurality of ribs are formed at intervals in the circumferential direction on the inclined surface of the case,
The plurality of ribs protrudes to the inner peripheral side from the divided portion through the notch,
A vent valve for a drain pipe according to claim 3. When one circumferential edge of one of the plurality of ribs is in contact with the divided portion of the inclined portion, both circumferential edges of the other rib and the divided portion of the inclined portion A plurality of the ribs and a plurality of the notches are respectively formed so that a gap is formed between
The drainage pipe vent valve according to claim 4. The plurality of divided portions have the same shape as each other,
The plurality of notches have the same shape as each other,
The circumferential width of one rib among the plurality of ribs is larger than the circumferential width of the other rib.
A vent valve for a drain pipe according to claim 5.