JP2007255513A - Vent valve for drainage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vent valve for drainage capable of being installed even in a small space and a space having small width. <P>SOLUTION: This vent valve for drainage is provided with a connection pipe 22 connected with a vent pipe for drainage, a valve seat 24 having a seating face 24a inclined around a vent, and a valve element 25 seated on the seating face 24a when closing the valve. This vent valve for drainage has a substantially rectangular shape in plane view, and the connection pipe 22 and the vent are arranged in parallel in its longitudinal direction. The valve element may be a flexible sheet-like element. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a drainage vent valve that is connected to a drainage vent pipe and automatically opens to take in air when the inside of the pipe becomes negative.

  Conventionally, in buildings such as condominiums and office buildings, drainage devices such as toilets, kitchens, and bathtubs are connected to discharge main pipes through drainage branch pipes. Usually, the drainage branch pipe is provided with a trap so as to prevent bad odors from entering the room.

  The drainage discharged from these drainage devices flows while being concentrated from the drainage branch pipe to the drainage main pipe. By the way, when water flows through the drainage main pipe, there is a case where the pipe pressure suddenly fluctuates and the pipe pressure temporarily becomes significantly lower than the atmospheric pressure. In such a case, the trap seal water of the drainage branch pipe is sucked, and the function of the trap may be lost. Therefore, conventionally, a drainage vent pipe is connected to the drainage main pipe for the purpose of preventing a rapid drop in the pressure in the pipe.

  The drainage vent pipe is a pipe for taking in air from the outside when the pressure of the drainage main pipe is greatly reduced, and a drainage vent valve is attached to the tip of the drainage vent pipe. The drainage vent valve automatically opens when the internal pressure becomes negative, and introduces air into the drainage vent pipe. When air is introduced into the drainage vent pipe, the internal pressure fluctuation is alleviated and the trap is kept in a good state.

As a drainage vent valve of this type, for example, as shown in Patent Document 1 below, an annular wall that is inclined in a substantially funnel shape so as to spread upward is provided, and a plurality of valve openings are arranged circumferentially on the annular wall. An installed vent valve is known. The drainage vent valve includes a plurality of substantially fan-shaped valve bodies that open and close each valve port. Each valve body is made of an elastic material such as synthetic rubber, and its upper end is fixed to the ring wall, and is configured to swing open and close with the upper end as a fulcrum. Around each valve port of the ring wall is a valve seat, which is in close contact with the surrounding portion of the valve body when the valve body is closed.
Japanese Patent Laid-Open No. 10-103549

  However, in the drainage vent valve disclosed in Patent Document 1, the connection port connected to the drainage vent pipe is formed on the center side of the ring wall. In other words, the annular wall is formed so as to surround the periphery of the connection port portion, and the valve body and the valve seat are arranged so as to spread radially outward from the connection port portion in plan view. For this reason, the drainage vent valve is considerably larger than the connection port. Therefore, it is difficult to install the drainage vent valve in a small space or a narrow space.

  This invention is made | formed in view of this point, The place made into the objective is providing the vent valve for drainage which can be installed also in a small space or a narrow space.

  The drainage vent valve according to the present invention is a drainage vent valve that is connected to a drainage vent pipe and automatically opens when the pressure in the drainage vent pipe becomes negative and introduces air into the drainage vent pipe. A main body formed in a shape elongated in a predetermined direction in a plan view and formed with a connection port portion connected to the drainage vent pipe and a vent port for introducing air, and an inclination surrounding the periphery of the vent port A valve body having a seating surface and a valve body that is fixed to the valve seat and opens and closes by swinging with a fixed portion of the valve seat as a fulcrum, and seats on the seating surface when the valve is closed And the connection port portion and the vent port are arranged in the predetermined direction in a plan view.

  The above “elongated shape” means a shape in which the length in one direction is longer than the length in the other direction, and the ratio of the lengths is not limited. Therefore, squares and circles are excluded, but other shapes such as a rectangular shape (including a shape whose length in the long side direction is slightly longer than the length in the short side direction), an oval shape, etc. In the “elongated shape”.

  According to the drainage vent valve, since the connection port portion and the vent port are arranged in a predetermined direction in plan view, the length in the direction orthogonal to the predetermined direction (hereinafter referred to as the width direction) is short. Therefore, it can be easily installed in a small space or a narrow space.

  In the drainage vent valve, the seating surface of the valve seat is formed flat in a width direction perpendicular to the swinging direction of the valve body, and at least partially in an inclined direction perpendicular to the width direction. It is preferably curved so as to be convex.

  According to the above configuration, the seating surface of the valve seat is formed flat in the width direction (the direction orthogonal to the swinging direction of the valve body), and is convex upward in at least a part of the tilt direction. Is curved. Therefore, when the valve body is seated, the adhesion between the valve body and the valve seat is improved. Therefore, when the valve body is closed, air leakage can be prevented more reliably. Moreover, the opening / closing operation | movement of a valve body can be smoothed.

  In general, in a resin molded product, it is difficult to form a flat surface (a flat surface in both the width direction and the inclination direction) due to heat shrinkage and the like. However, in the drainage vent valve, the seating surface of the valve seat is flat in the width direction, but is curved in the inclined direction, and is a curved surface as a whole. Therefore, since it is not necessary to form a seating surface in a flat surface, it can manufacture simply and cheaply by resin molding.

  The valve body is preferably formed in a flexible sheet shape.

  This ensures a high degree of sealing performance between the valve body and the valve seat.

  In the drainage vent valve, it is preferable that a weight is provided at a lower end portion of the valve body.

  This is because when the weight of the lower end of the valve body (the end opposite to the fulcrum of swinging) increases, the opening and closing of the valve body is further smoothed. The weight may be formed integrally with the valve body (a part of the valve body may be a weight), or may be formed separately from the valve body.

  The drainage vent valve is disposed above the upper end portion of the valve body, and fixes the upper end portion of the valve body to the valve seat by sandwiching the upper end portion of the valve body together with the valve seat. A first plate, a second plate fixed to the upper side of the lower end of the valve body, and a connecting rod that slidably engages with the first plate and connects the first plate and the second plate And are preferably provided.

  As a result, the first plate, the second plate, and the connecting rod constitute a frame that retains the shape of the valve body, and can more reliably prevent the valve body from being twisted when the valve body is opened and closed. is there.

  Further, in the drainage vent valve, the second plate is formed with a protrusion protruding in the width direction, and the connecting rod is formed with an attachment hole through which the protrusion of the second plate is inserted. The mounting hole is preferably a long hole through which the protrusion can reciprocate.

  This is because the protrusion of the second plate reciprocates in the attachment hole of the connecting rod along with the opening / closing operation of the valve body, so that the flexible valve body moves smoothly.

  Moreover, it is preferable that the curvature of the said inclination direction in the lower end part of the seating surface of the said valve seat is smaller than the curvature of the said inclination direction above the said lower end part.

  Thereby, the inclination degree in the lower end part of a seating surface becomes comparatively gentle. Therefore, the lower end portion of the valve body is easily raised up, and the opening operation of the valve body becomes smooth. Further, the lower end portion of the valve body is easily brought into close contact with the seating surface, and the valve body is smoothly closed.

  In the drainage vent valve, it is preferable that a rib extending along the inclined direction is provided inside the vent of the valve seat.

  This is because the seated valve body can be supported by the rib and the valve seat can be reinforced.

  According to the present invention, it is possible to obtain a drainage vent valve that can be easily installed in a small space or a narrow space.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a diagram illustrating an example of a construction state of the drainage vent valve 20 according to the embodiment. In this example, the drainage vent valve 20 is disposed in the vicinity of the back side (left side in the drawing) 3 of the drainage device (a toilet is shown as an example of the drainage device in FIG. 1) in the pipe shaft 8. The inside of the pipe shaft 8 is a narrow space. The drainage device 3 is installed in the room 2 of the building 1. The drainage device 3 is connected to a drainage main pipe 5 via a drainage branch pipe 4. Although not shown, the drainage branch pipe 4 is provided with a trap. The drainage branch pipe 4 and the drainage main pipe 5 are arranged under the floor 6 of the building 1.

  A T-shaped cheese 9 is attached to the drainage main pipe 5, and a drainage vent pipe 7 is connected to the upper end of the cheese 9. The drainage vent pipe 7 extends upward from the cheese 9 through the pipe shaft 8.

  The drainage vent valve 20 according to the present embodiment is connected to the drainage vent pipe 7 in the vicinity of the back side of the drainage device 3 in the pipe shaft 8. The drainage vent valve 20 is mainly for keeping trapped water in the drainage branch pipe 4, and opens when the internal atmospheric pressure falls below atmospheric pressure (that is, when it becomes negative), and sucks outside air. . Thereby, outside air flows into the drainage vent pipe 7 from the drainage vent valve 20, and a rapid pressure drop in the drainage main pipe 5 is suppressed. As a result, the trap seal water of the drainage device 3 is protected without being sucked, and odor can be prevented from entering the room 2 from the drainage device 3.

  Next, the configuration of the drainage vent valve 20 will be described. FIG. 2 is a plan view of the drainage vent valve 20, and FIG. 3 is a side view of the drainage vent valve 20. As shown in FIG. 3, the drainage vent valve 20 includes a main body 26 and a substantially rectangular box-shaped cover 21 that covers the upper portion of the main body 26. In the present embodiment, the cover 21 is made of a transparent resin. Therefore, the inside of the drainage vent valve 20 can be visually recognized through the cover 21 (the internal structure is not shown in FIGS. 2 and 3), and the necessity of maintenance can be easily recognized.

  FIG. 4 is a side view of the drainage vent valve 20 with the cover 21 removed. As shown in FIG. 4, the main body 26 includes a connecting pipe 22 connected to the drainage vent pipe 7 described above, a cover connecting portion 23 into which the cover 21 is fitted, and a valve seat 24. On the valve seat 24, the valve body 25 which rocks | swings using an upper end part as a fulcrum is arrange | positioned. A first plate 31 is disposed on the upper end portion of the valve body 25, and a second plate 32 is fixed on the lower end portion of the valve body 25. The first plate 31 and the second plate 32 are connected by left and right connecting rods 35 (see FIG. 12). The valve body 25, the first plate 31, the second plate 32, and the connecting rod 35 will be described later. A seal ring 27 is provided between the cover connecting portion 23 and the cover 21, and the cover 21 and the main body 26 are airtightly connected.

  In the present embodiment, the main body 26 is resin-molded. That is, the connecting pipe 22, the cover connecting portion 23, and the valve seat 24 are integrally formed. However, the connecting pipe 22, the cover connecting portion 23, and the valve seat 24 may be formed as separate members, and may be joined by an adhesive or the like.

  The valve seat 24 is formed in a substantially right triangle shape in a side view, and is formed in a substantially rectangular shape in a plan view (see FIG. 5). As shown in FIGS. 5 and 6A, a vent hole 24b having a substantially rectangular shape in plan view is formed on the inclined surface of the valve seat 24, and a peripheral portion of the vent hole 24b is seated on which the valve body 25 is seated. It becomes the surface 24a. The seating surface 24a is formed flat in the width direction (Y direction in FIG. 6A), and is curved so as to be convex upward in the tilt direction (X direction in FIG. 6A). Yes.

  On the inner side of the vent 24b of the valve seat 24, five ribs 24c extending along the inclination direction are provided. Each rib 24c is curved so as to protrude upward similarly to the seating surface 24a, and each rib 24c is disposed flush with the seating surface 24a. In addition, although the upper side of each rib 24c may be formed in the flat surface, as shown in FIG.6 (b), it may be formed in the taper shape toward upper direction. Thereby, when the valve body 25 is closed, the contact area of the valve body 25 and each rib 24c becomes small.

  As shown in FIG. 6A, a protruding plate 24 d extending vertically upward is integrally formed at the upper end portion of the seating surface 24 a of the valve seat 24. The protruding plate 24 d is inserted through the valve body 25 and the first plate 31, and holds the upper end portion of the valve body 25 and the first plate 31. The protruding plate 24d is provided with a step 24e for preventing the inserted valve body 25 and the first plate 31 from coming off.

  FIG. 7A is a plan view of the valve body 25, and FIG. 7B is a side view of the valve body 25. The valve body 25 is formed of a flexible sheet-like member. In the present embodiment, the valve body 25 is formed of a rubber sheet that is an elastic body. The valve body 25 is formed in a substantially rectangular shape that is slightly larger than the vent hole 24b. As shown in FIG. 4, the upper end portion of the valve body 25 is sandwiched between the upper end portion of the seating surface 24 a of the valve seat 24 and the first plate 31. Therefore, the valve body 25 swings with its upper end portion as a fulcrum, and can be opened and closed by a so-called swing.

  As shown in FIGS. 7A and 7B, a rectangular opening 25a is formed in the central portion of the upper end portion of the valve body 25 (the right end portion in FIG. 7A). The protruding plate 24d (see FIG. 6A) of the valve seat 24 is inserted into the rectangular opening 25a. Therefore, when the valve body 25 is attached to the valve seat 24, the rectangular opening 25a is positioned at the upper end portion of the seating surface 24a.

  In addition, two substantially cylindrical engagement protrusions 25b are integrally formed at the lower end of the valve body 25 (the left end in FIGS. 7A and 7B). These engagement protrusions 25 b extend in a direction orthogonal to the main surface of the valve body 25. These engagement protrusions 25 b are for fixing the valve body 25 and the second plate 32. When the valve body 25 is attached to the valve seat 24, these engaging projections 25b are located at the lower end of the seating surface 24a. In addition, when the engagement protrusion part 25b is integrally formed in the valve body 25, the weight of the lower end part of the valve body 25 will increase.

  As shown in FIG. 6B, the engagement protrusion 25b of the valve body 25 is disposed at a position displaced from the rib 24c. That is, the engagement protrusion 25b is disposed so as to be positioned between the rib 24c and the rib 24c when the valve body 25 is seated on the seating surface 24a of the valve seat 24. Thereby, when the valve body 25 is opened and closed, the interference between the engaging projection 25b and the rib 24c is prevented. Therefore, even if the valve body 25 is opened and closed vigorously, the opening and closing operation is stable and the generation of abnormal noise is prevented.

  8A is a plan view of the first plate 31 (second plate 32), FIG. 8B is a side view thereof, and FIG. 8C is a line VIIIc-VIIIc in FIG. 8A. It is sectional drawing. The first plate 31 and the second plate 32 may be different in shape or size, but in this embodiment, the first plate 31 and the second plate 32 are different from each other in order to reduce design and manufacturing costs by sharing parts. The plate 32 has the same shape and dimensions. Therefore, in the following, both will be described together.

  The first plate 31 (second plate 32) has an elongated and substantially thin plate shape, and both end portions thereof stand upward. An opening 31 a (32 a) having a rectangular shape in plan view is formed at a central portion in the longitudinal direction of the first plate 31 (second plate 32). A protruding plate 24 d (see FIG. 6A) of the valve seat 24 is inserted into the rectangular opening 31 a of the first plate 31. On the other hand, nothing is inserted through the rectangular opening 32 a of the second plate 32.

  As shown in FIG. 8C, the rectangular opening 31a (32a) is formed so as to be inclined in a direction orthogonal to the longitudinal direction. The inclination angle of the rectangular opening 31a (32a) is set in accordance with the inclination degree of the seating surface 24a so that the back surface of the first plate 31 is along the seating surface 24a of the valve seat 24.

  On both sides in the longitudinal direction of the rectangular opening 31a (32a), openings 31b (32b) having a circular shape in plan view are formed. The two engaging protrusions 25b (see FIG. 7) of the valve body 25 are inserted through the circular openings 32b of the second plate 32, respectively. On the other hand, nothing is inserted through the circular opening 31 b of the first plate 31.

  At both ends of the first plate 31 (second plate 32), a substantially cylindrical engaging protrusion 31c (32c) extending laterally is formed. The engaging protrusion 31c (32c) is for connecting a connecting rod 35 (described later) and the first plate 31 (second plate 32).

  FIG. 9A is a plan view of the connecting rod 35, and FIG. 9B is a side view thereof. As shown in FIGS. 9A and 9B, the connecting rod 35 has a thin thin plate shape, and both ends of the connecting rod 35 are formed in a substantially disk shape. As described above, the connecting bar 35 is for connecting the first plate 31 and the second plate 32 and is attached to both sides of the first plate 31 and the second plate 32, respectively.

  An attachment hole 35a is formed at one end of the connecting rod 35 (the right end in FIG. 9A). The engaging projection 31c of the first plate 31 is rotatably inserted into the mounting hole 35a. Thereby, the connecting rod 35 is connected to the first plate 31 so as to be swingable. An attachment hole 35b is formed at the other end of the connecting rod 35 (the left end in FIG. 9A). The engaging projection 32c of the second plate 32 is inserted through the mounting hole 35b. The attachment hole 35b is a long hole extending in the longitudinal direction, and the engagement protrusion 32c is supported in the attachment hole 35b so as to be rotatable and reciprocally movable.

  Further, as shown in FIG. 9B, a protrusion 35c is formed on the right side of the mounting hole 35b. As shown in FIG. 12, the protrusion 35c suppresses the valve body 25 from being deformed by pressing the valve body 25 from above. That is, in a state where the valve body 25, the first plate 31, the second plate 32, and the connecting rod 35 are assembled, the protrusion 35 c is disposed above the valve body 25. When the valve body 25 is likely to be bent during the opening / closing operation of the valve body 25, the valve body 25 is pressed by the projection 35c, and the valve body 25 is prevented from being greatly bent or twisted.

  Next, the shape of the seating surface 24a of the valve seat 24 will be described in more detail. FIG. 10 is a partial sectional view (longitudinal sectional view) of the valve seat 24 showing an inclined state of the seating surface 24a. 11 is a cross-sectional view (cross-sectional view) taken along line XI-XI in FIG. As shown in FIG. 10, the seating surface 24a is divided into a curved region A and a flat region B, with an inflection point C near the lower end as a boundary. The curved region A is a region from the vicinity of the upper end portion serving as the pivot point of the valve body 25 to the inflection point C, and is curved so as to protrude upward along the tilt direction (the X direction in the drawing). Yes. On the other hand, the flat region B is a region from the inflection point C to the lower end, and forms a flat surface. Therefore, the inclination of the seating surface 24a is steep from the upper end to the lower end in the curved region A at a constant change rate, but the inclination is constant in the flat region B with the inflection point C as a boundary. It becomes.

  More specifically, in this embodiment, the curvature of the curved region A is constant, and the flat region B is flat, so the curvature is zero. Therefore, the curvature of the seating surface 24a decreases discontinuously from the vicinity of the upper end portion toward the lower end with the inflection point C as a boundary. Here, if the entire area of the seating surface 24a is a curved region, the entire seating surface 24a is curved so as to protrude upward, and the lower end portion of the seating surface 24a is the portion with the largest inclination angle. Therefore, the lower end portion of the valve body 25 is unlikely to rise when the valve is opened. On the other hand, in this embodiment, the lower end portion of the valve body 25 is likely to rise as much as the flat region B is provided at the lower end portion of the seating surface 24a. Further, the lower end portion of the valve element 25 is likely to be in close contact with the seating surface 24a when the valve is closed.

  As shown in FIG. 11, the seating surface 24a is flat in the width direction (Y direction).

  FIG. 12 is a plan view showing a state in which the first plate 31, the second plate 32, and the two connecting rods 35 are attached to the valve body 25. The first plate 31, the second plate 32, and the connecting rod 35 constitute a frame that holds the shape of the valve body 25.

  The protruding plate 24 d formed on the valve seat 24 passes through the rectangular opening 25 a (see FIG. 7) of the valve body 25 and the rectangular opening 31 a of the first plate 31. Thereby, the upper end part of the valve body 25 is being fixed in the state clamped between the 1st plate 31 and the valve seat 24. FIG. Further, the two engaging protrusions 25 b formed at the lower end of the valve body 25 are inserted into the circular opening 32 b of the second plate 32. Thereby, the valve body 25 and the second plate 32 are fixed. As described above, nothing is inserted through the circular opening 31b of the first plate 31 and the rectangular opening 32a of the second plate.

  Engagement projections 31 c formed on both sides of the first plate 31 are inserted through the mounting holes 35 a of the two connecting rods 35. Further, the engaging protrusions 32 c formed on both sides of the second plate 32 are inserted into the mounting holes 35 b of the two connecting rods 35. Thereby, the first plate 31 and the second plate 32 are connected via the two connecting rods 35.

  Thus, in the state where the two connecting rods 35 are attached to the first plate 31 and the second plate 32, the protrusions 35c formed on the connecting rod 35 are arranged so as to extend inward. And each projection part 35c of the connecting rod 35 presses both sides near the lower end part of the valve body 25 from above.

  Next, the opening / closing operation of the valve body 25 will be described. FIG. 13A is a side view showing a closed state of the valve body 25, and FIG. 13B is a side view showing an open state of the valve body 25. A symbol F in FIG. 13B indicates the swinging direction of the valve body 25.

  As shown in FIG. 13A, in the closed state, the valve body 25 is seated along the seating surface 24a of the valve seat 24, and the vent hole 24b (see FIG. 5) is closed by the valve body 24. . Thereby, the inside of the drainage vent valve 20 is kept airtight. At this time, the engagement protrusion 32c of the second plate inserted through the attachment hole 35b, which is a long hole, is located on the left end side (the left end side in FIG. 13A) of the attachment hole 35b.

  When the drainage device 3 (see FIG. 1) is drained in this closed state, and the inside of the drainage vent valve 20 becomes negative pressure, the valve body 25 is sucked and pressed by the first plate 31. It swings with the (fixed part) as a fulcrum (see FIG. 13B). As a result, the vent 24 b is opened, and outside air is introduced into the drainage vent pipe 7 via the drainage vent valve 20. As a result, a significant pressure drop in the drain main pipe 5 is suppressed. In addition, as shown in FIG.13 (b), in the open state, the valve body 25 can be opened until it becomes substantially horizontal.

  In this open state, the engaging projection 32c of the second plate 32 has moved to the right end side of the mounting hole 35b. That is, in the present embodiment, during the opening operation of the valve body 25, the engagement protrusion 32c moves from the left side to the right side in FIG. 13B in the attachment hole 35b which is a long hole. Conversely, during the closing operation of the valve body 25, the engaging projection 32c moves from the right side to the left side in the mounting hole 35b. As described above, the engagement protrusion 32c of the second plate 32 reciprocates inside the attachment hole 35b of the connecting rod 35 in accordance with the opening / closing operation of the valve body 25, so that the movement of the valve body 25 becomes smooth. .

  As described above, the drainage vent valve 20 according to the present embodiment has an elongated shape in plan view, and the connection pipe 22 and the vent hole 24b are arranged side by side in the longitudinal direction (see FIG. 5). . Specifically, the drainage vent valve 20 according to the present embodiment is formed in a substantially rectangular shape in plan view. For this reason, the width is shortened (the aspect ratio is not particularly limited, but in this embodiment, the aspect ratio is formed to be 2 or more), and it is installed in a small space or a narrow space. can do.

  FIGS. 14A to 14C are views showing the installation status of the drainage vent pipe 7 and the drainage vent valve 20. FIG. 14A shows a case where the drainage vent pipe 7 is arranged near the corner in the pipe shaft. As described above, when the drainage vent pipe 7 is arranged near the corner, the large drainage vent valve 100 having a shape as shown in the prior art (the shape indicated by a two-dot chain line in FIG. 14A) is used. , The installation space will be lost and it will not be possible to install.

  However, like the drainage vent valve 20 according to the present embodiment, the plan view has an elongated shape, and when the connection pipe 22 and the vent 24b are arranged along the longitudinal direction, FIG. As shown in (b), the drainage vent valve 20 can be installed along the inner wall 40 of the pipe shaft. When the drainage vent pipe 7 is arranged in the vicinity of the corners in this way, the drainage vent valve 20 is set in the lateral direction with the connecting pipe 22 connected to the drainage vent pipe 7 as an axis (FIG. 14B). ) In the vertical direction (indicated by a two-dot chain line in FIG. 14B). Therefore, according to the drainage vent valve 20, the layout such as the position of the pipe shaft can be flexibly dealt with.

  Furthermore, as shown in FIG. 14C, when the installation space for the drainage vent valve 20 is narrow, a large size having a shape as shown in the prior art (a shape indicated by a two-dot chain line in FIG. 14C). This drainage vent valve 100 interferes with the inner wall 40 of the pipe shaft and cannot be installed. In contrast, the drainage vent valve 20 according to the present embodiment can be easily installed even in such a narrow installation space. Therefore, as shown in FIG. 1, it can arrange | position efficiently also in narrow spaces, such as the back side of a wall.

  Further, according to the drainage vent valve 20 according to the present embodiment, the seating surface 24a of the valve seat 24 is curved so as to protrude upward along the tilt direction (X direction) and is flat in the width direction. have. For this reason, when the flexible sheet-like valve body 25 is seated on the seating surface 24a, the adhesion between the valve body 25 and the seating surface 24a is improved. As a result, when the valve body 25 is in the open state, the inside of the drainage vent valve 20 is kept airtight, and the outflow of air to the outside can be more reliably prevented. Therefore, generation of malodor can be prevented more reliably. In addition, since the adhesion between the seating surface 24a and the valve body 25 is improved, the valve body 25 can be smoothly opened when the inside of the drainage vent pipe 7 becomes negative pressure.

  In this embodiment, the main body 26 of the drainage vent valve 20 is manufactured by resin molding. Here, in the resin molded product, due to heat shrinkage or the like, it is difficult to form a flat surface unless advanced quality control is performed. However, in the drainage vent valve 20, the seating surface 24a of the valve seat 24 is a curved surface as a whole. Therefore, since it is not necessary to form the seating surface 24a on a flat surface, it can be manufactured easily and inexpensively by resin molding.

  Moreover, in this embodiment, the engagement protrusion part 25b is integrally formed in the lower end part of the valve body 25, and, thereby, the weight of the lower end part of the valve body 25 is increasing. Therefore, the valve body 25 and the seating surface 24a of the valve seat 24 are easily in close contact with each other. Further, since the swing operation of the valve body 25 is stabilized, the valve body 25 is smoothly opened when the inside of the drainage vent valve 20 becomes negative pressure. Further, since the valve body 25 and the valve seat 24 are stably in close contact with each other, the valve body 25 is not easily detached from the valve seat 24 even if the drainage vent valve 20 is slightly inclined. The weight of the valve body 25 is not limited to the engagement protrusion 25b, and may not engage with the second plate 32.

  In the present embodiment, the upper end portion and the lower end portion of the valve body 25 are fixed by the first plate 31 and the second plate 32, respectively, and the first plate 31 and the second plate 32 are connected by the two connecting rods 35. . Therefore, the shape of the valve body 25 can be maintained more reliably. Therefore, it is possible to more reliably prevent the valve body 25 from being bent or twisted during the opening / closing operation. Note that the second plate 32 also functions as a weight of the valve body 25. Therefore, the opening / closing operation of the valve body 25 can be further stabilized for the reasons described above.

  In the present embodiment, the attachment hole 35b of the connecting rod 35 is formed as a long hole, and the engagement protrusion 32c of the second plate 32 can reciprocate within the attachment hole 35b. Therefore, the engagement protrusion 32c of the second plate 32 reciprocates with the opening / closing operation of the valve body 25, so that the movement of the valve body 25 can be made smooth.

  In the present embodiment, a flat region B is formed at the lower end of the seating surface 24a of the valve seat 24. Therefore, it is easy for the valve body 25 to rise up while the valve body 25 is seated on the seating surface 24a. As a result, the initial movement of the valve body 25 becomes smooth, and the valve body 25 can be opened smoothly. Further, when the valve body 25 is closed, the lower end portion of the valve body 25 is easily brought into close contact with the seating surface 24a. Therefore, the valve body 25 can be closed smoothly.

  In the present embodiment, a rib 24c is provided on the inner side of the vent valve 24b. Therefore, when the valve body 25 is seated, the valve body 25 can be supported by the rib 24c. Therefore, the opening / closing operation of the valve body 25 can be stabilized. Further, the valve seat 24 can be reinforced by the ribs 24c. Further, the rib 24c serves as a filter, and it is possible to prevent large dust from entering from the outside.

  In the present embodiment, the rib 24c extends along the tilt direction, but the rib 24c may extend in another direction (for example, the width direction). The number of ribs 24c is not particularly limited. The ribs 24c may be formed in a lattice shape.

  As shown in FIG. 6B, the cross section of the rib 24c is formed to be tapered upward. Thereby, the contact area of the valve body 25 and the rib 24c becomes small, and the opening / closing operation | movement of the valve body 25 can be made smoother.

  Further, in the present embodiment, the drainage vent valve 20 includes a pair of valve bodies 25 and a valve seat 24. That is, in the drainage vent valve 20 of the present embodiment, one valve body 25 and one valve seat 24 are provided. Therefore, it is excellent in maintainability compared with a drainage vent valve provided with a plurality of valve bodies and valve seats. Further, it becomes easier to reduce the size as compared with a drainage vent valve provided with a plurality of valve bodies and valve seats. Therefore, it can be installed in a relatively small space and is excellent in storage.

  However, in the present invention, the number of valve bodies and valve seats is not limited to one each. The drainage vent valve according to the present invention may include a plurality of valve bodies and valve seats. In plan view, the pair of valve bodies and valve seats may be provided only on one side of the connection pipe 22, but may be provided on both sides of the connection pipe 22 (both sides in the longitudinal direction of the main body 26).

  As described above, the present invention is useful for a drainage vent valve connected to a drainage vent pipe.

It is a figure which shows the construction state of the vent valve for drainage which concerns on embodiment. It is a top view of the vent valve for drainage. It is a side view of the vent valve for drainage. It is a side view which shows the vent valve for drainage of the state which removed the cover. It is a top view which shows the vent valve for drainage of the state which removed the cover. (A) is a perspective view of a valve seat, (b) is the VIb-VIb sectional view taken on the line of (a). (A) is a top view of a valve body, (b) is the side view. (A) is a top view of the 1st plate, (b) is the side view, (c) is a VIIIc-VIIIc line sectional view of (a). (A) is a top view of a connecting rod, (b) is the side view. It is a longitudinal cross-sectional view of the valve seat which shows a seating surface. It is the XI-XI sectional view taken on the line of FIG. It is a top view which shows a mode that the 1st plate, the 2nd plate, and the connecting rod are attached to the valve body. (A) is a side view which shows the closed state of a valve body, (b) is a side view which shows the open state of a valve body. (A)-(c) is a top view which shows the installation condition of the vent pipe for drainage, and the vent valve for drainage.

Explanation of symbols

7 Drainage vent pipe 20 Drainage vent valve 21 Cover 22 Connection pipe 24 Valve seat 24a Seating surface 24b Air vent 24c Rib 25 Valve body 31 First plate 32 Second plate 35 Connecting rod F Swing direction X Inclination direction Y Width direction

Claims (8)

A drainage vent valve that is connected to a drainage vent pipe and automatically opens when the inside of the drainage vent pipe becomes negative pressure, and introduces air into the drainage vent pipe,
A body formed in a shape elongated in a predetermined direction in a plan view, and formed with a connection port portion connected to the drainage vent pipe and a vent port for introducing air;
A valve seat having an inclined seating surface surrounding the periphery of the vent;
The upper end portion is fixed to the valve seat, and opens and closes by swinging with a fixed portion with the valve seat as a fulcrum, and includes a valve body that is seated on the seating surface when the valve is closed,
A drainage vent valve in which the connection port portion and the vent port are arranged in the predetermined direction in a plan view.   The seating surface of the valve seat is formed flat in the width direction orthogonal to the swinging direction of the valve body, and is convex upward in at least a part of the inclined direction orthogonal to the width direction. The drainage vent valve according to claim 1, which is curved.   The drain valve according to claim 1 or 2, wherein the valve body is formed in a flexible sheet shape.   The drainage vent valve according to any one of claims 1 to 3, wherein a weight is provided at a lower end portion of the valve body. A first plate that is disposed above the upper end portion of the valve body, and fixes the upper end portion of the valve body to the valve seat by sandwiching the upper end portion of the valve body together with the valve seat;
A second plate fixed above the lower end of the valve body;
The drainage vent according to any one of claims 1 to 4, further comprising a connecting rod that swingably engages with the first plate and connects the first plate and the second plate. valve. The second plate has a protrusion protruding in the width direction,
The connecting rod is formed with an attachment hole through which the protrusion of the second plate is inserted,
The drainage vent valve according to claim 5, wherein the attachment hole is a long hole through which the protrusion can reciprocate.   The drainage vent valve according to any one of claims 1 to 6, wherein a curvature in the inclined direction at a lower end portion of a seating surface of the valve seat is smaller than a curvature in the inclined direction above the lower end portion. . The drainage vent valve according to any one of claims 1 to 7, wherein a rib extending along the inclined direction is provided inside the vent hole of the valve seat.

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