JP2011052745A - Vent valve for drainage - Google Patents

Abstract

Disclosed is a drainage vent valve capable of stably and smoothly opening and closing a valve body.
A drainage vent valve (1) connected to a drainage vent pipe (A) and automatically opens when the drainage vent pipe (A) reaches a negative pressure and introduces air into the drainage vent pipe (A). A main body 2 having a connection port 15 connected to the drainage vent pipe A, a vent port 16 for introducing air, and a valve seat 17 provided around the vent port 16; and provided in the main body. And a valve body 30 that is supported by the valve seat 17 when the valve is closed and is provided so as to be movable up and down so as to open and close the vent hole 16. The main body 2 and the cover body 3 respectively have guide means for guiding the valve body 30 when the valve body 30 is moved up and down.
[Selection] Figure 2

Description

  The present invention relates to a drainage vent valve that is connected to a drainage vent pipe and automatically opens to introduce air when the inside of the pipe reaches a negative pressure.

  In general, this type of drainage vent valve has a main body formed with a connection port connected to a drainage vent pipe and a vent port for introducing air, a valve seat formed along the periphery of the vent port, A valve body provided in the vent hole so as to be freely opened and closed, and a lower opening-shaped cover body detachably attached to the main body. Moreover, in order to perform the raising / lowering operation | movement of a valve body satisfactorily, the following various means were employ | adopted in the conventional vent valve for drainage.

  For example, in Patent Document 1, a round bar-shaped guide shaft is disposed upward at the center of the vent of the main body, and the guide shaft is slidably inserted into a cylindrical portion provided in the center of the valve body. ing. Further, in the one disclosed in Patent Document 2, a round bar-shaped guide shaft is provided so as to protrude downward on the cover body side, and the guide shaft is similarly slidably inserted into the tubular portion of the valve body.

  On the other hand, there is a valve body itself provided with a guide shaft. For example, as shown in Patent Document 3, a guide shaft is slidably inserted into a cylindrical portion arranged in a vent of a main body. Further, in the device disclosed in Patent Document 4, a guide shaft is slidably inserted into a cylindrical portion protruding downward from the cover body. In these conventional devices, the valve body is moved up and down by using the guide function of the guide shaft or the cylindrical portion.

Japanese Patent No. 2866833 Japanese Patent No. 3366595 Japanese Patent No. 3041301 JP 2001-132863 A

  However, in the drainage vent valve according to Patent Documents 1 and 2, it is necessary to set the length of the cylindrical portion to be short in order to ensure the sliding amount of the valve body. A sufficient amount of contact could not be secured. Therefore, since the valve body easily tilts with respect to the guide shaft, the sliding operation cannot be performed properly.

  In the drainage vent valve according to Patent Documents 3 and 4, although the cylindrical portion is formed relatively long, the contact amount between the guide shaft and the cylindrical portion is extremely reduced as the former is opened. In the latter case, the contact amount between the guide shaft and the cylindrical portion decreases as the valve is closed. Therefore, these conventional ones cannot deny that the sliding motion of the valve body when the valve is closed or opened is extremely unstable, and there is a serious problem that the function as the valve body cannot be exhibited. It was.

  Therefore, the present invention has been made in view of such points, and an object of the present invention is to provide a drainage vent valve that can stably and smoothly perform opening and closing operations of a valve body. .

  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 having a connection port connected to the drainage vent pipe, a vent hole for introducing air, a valve seat provided around the vent hole, a cover body provided on the main body, and a closed body. A valve body supported by a valve seat at the time of valve operation and provided so as to be movable up and down to open and close the vent, and the main body and the cover body respectively provide guide means for guiding the valve body when the valve body is moved up and down. It is characterized by having.

  In such a drainage vent valve, the valve body is doubly guided by the guide means that the main body and the cover body respectively have when the valve body is moved up and down. The raising and lowering operation can be performed stably and smoothly. Thereby, since it becomes possible to make a valve body and a valve seat contact | abut favorably, a vent hole is obstruct | occluded reliably with a valve body. Further, since the valve body can be appropriately separated from the valve seat, the vent hole is automatically opened according to the situation.

  Further, a cylindrical portion may be formed at the center of the valve body, and the guide means may be constituted by a guide shaft that is slidably inserted into the cylindrical portion.

  According to this, the raising / lowering operation of the valve body is performed in a state where the guide shafts respectively provided on the main body and the cover body are slidably inserted into the tubular portion of the valve body. In such lifting operation, the contact amount between the tubular portion of the valve body and each guide shaft can be sufficiently secured, so that the valve body does not tilt with respect to the guide shaft, It will move up and down stably and smoothly.

  Furthermore, it is also possible to form a recess in the axial direction over the entire length of the side surface of the guide shaft.

  If such a recess is formed on the side surface of the guide shaft, the amount of contact between the side surface of the guide shaft and the inner peripheral surface of the tubular portion of the valve body will be reduced. Since it is held, there is no hindrance to the raising / lowering operation of the valve body, and rather, the raising / lowering operation of the valve body can be performed more smoothly.

  Further, the inside of the cylindrical portion may be divided into two chambers, an upper chamber and a lower chamber, by a closing portion, and a guide shaft may be slidably inserted into each chamber.

  According to this, since the cylindrical part of the valve body is closed by the closing part, it is possible to prevent the odor in the drainage vent pipe from leaking outside through the cylindrical part. Further, by forming the concave portion in the guide shaft as described above, an air flow passage is ensured when the valve body is raised and lowered, so that the raising and lowering operation is performed smoothly.

  In addition, the upper chamber may be communicated with the outside of the cylindrical portion through a condensation discharge hole formed in the cylindrical portion.

  According to this, dew condensation or the like generated in the upper chamber is discharged to the outside of the cylindrical portion through the dew condensation discharge hole. For this reason, the sliding operation between the upper chamber and the guide shaft that is slidably inserted into the upper chamber is well maintained over a long period of time.

  Furthermore, the lower end portion of the guide shaft provided in the main body may be arranged at a position below the vent hole.

  According to this, since it becomes possible to ensure the length of a guide shaft enough, the raising / lowering amount of a valve body can be set appropriately.

  ADVANTAGE OF THE INVENTION According to this invention, the vent valve for drainage which can perform the opening / closing operation | movement of a valve body stably and smoothly is obtained.

The drainage vent valve which concerns on one Embodiment of this invention is shown, (a) is a front view, (b) is a bottom view. (A) is sectional drawing of the vent valve for drainage at the time of valve closing, (b) is sectional drawing of the vent valve for drainage at the time of valve opening. (A) is a cross-sectional view of the valve body in which the lower guide shaft is inserted, and (b) is a cross-sectional view of the valve body in which the upper guide shaft is inserted. It is a longitudinal cross-sectional view of a valve body. The drainage vent valve concerning other embodiments is shown, (a) is a sectional view and (b) is a bottom view.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the drainage vent valve 1 according to the present embodiment includes a main body 2 and a cover body 3 having a lower opening that is detachably attached to the main body 2. As shown in FIG. 2A, a convex portion 10 is provided around the upper outer peripheral surface of the main body 2, and a concave groove 11 provided around the lower inner peripheral surface of the cover body 3. The two are detachably attached. The cover body 3 does not necessarily need to be detachably attached to the main body 2 and may be configured to be completely fixed.

  A flange 12 is provided on the lower outer peripheral surface of the cover body 3, and a rubber seal ring 13 is integrally formed on the lower surface thereof by insert molding. When the cover body 3 is attached to the main body 2, the seal ring 13 is pressed against the upper surface of the flange 14 provided on the main body 2, so that no odor leaks between the main body 2 and the cover body 3. . Note that the seal ring 13 is not necessarily provided on the flange 12 of the cover body 3 by insert molding, and may be provided by, for example, two-color molding, adhesion, or uneven fitting. The seal ring 13 may be provided not on the flange 12 of the cover body 3 but on the flange 14 of the main body 2. Further, the flanges 12 and 14 can be omitted.

  As shown in FIGS. 1 and 2, the main body 2 is formed with a connection port 15 connected to the drainage vent pipe A and a vent port 16 for introducing air. An annular valve seat 17 is provided around the vent 16 so as to face upward. At a position below the vent hole 16, there is provided a planar substantially cross-shaped support member 18 composed of four pieces inclined downward toward the center. A lower guide shaft 19 as shown in FIG. 3A protrudes substantially vertically at the center of the upper surface of the support member 18. In addition, since the lower end part of the lower guide shaft 19 is disposed at a position below the vent hole 16, the length of the lower guide shaft 19 can be sufficiently secured. Since a plurality of recesses 19a are provided in the side surface of the lower guide shaft 19 in the axial direction over the entire length, the cross section of the lower guide shaft 19 is formed in a substantially cross shape.

  On the upper inner surface of the cover body 3, a round bar-shaped upper guide shaft 20 is provided so as to protrude downward, which is coaxially disposed with a predetermined distance from the upper end portion of the lower guide shaft 19. The upper guide shaft 20 may be formed in a substantially cross-shaped cross section like the lower guide shaft 19. Further, the number of the vent holes 16 can be appropriately changed, and a plurality of vent holes 16 may be provided.

  A valve body 30 is provided at the vent 16 so as to be freely opened and closed. As shown in FIG. 4, the valve body 30 is divided into a cylindrical portion 32 in which the inside is partitioned by a closing portion 31 and two chambers 32 a and 32 b are formed in the upper and lower sides, and a lower-side outer peripheral surface of the cylindrical portion 32. A valve main body 34 including a flange portion 33 provided substantially horizontally and a rubber packing 35 provided on the outer peripheral edge portion of the flange portion 33 so as to cover both front and back surfaces are provided. The flange portion 33 is not necessarily provided substantially horizontally on the cylindrical portion 32, and may be provided so as to be inclined upward or downward toward the distal end portion side. When inclined downward, the dew condensation adhering to the surface of the valve body 30 can be flowed down satisfactorily.

  The packing 35 is integrally formed with the flange portion 33 by insert molding, and can be elastically deformed. When the packing 35 is seated on the valve seat 17 of the main body 2, the vent hole 16 of the main body 2 is closed. A concave groove 36 is provided on the upper surface of the flange portion 33 in order to enhance the integrity with the packing 35. The concave groove 36 may be provided on the lower surface or both upper and lower surfaces of the flange portion 33 and may be omitted. The flange 33 is made of ABS resin to facilitate insert molding. However, the specific material of the collar portion 33 is not limited to this, including the cylindrical portion 32.

  As shown in FIGS. 2 and 3B, a pair of slit-shaped condensation discharge holes 37, 37 are formed in the tubular portion 32 so as to face each other in the vertical direction from the upper end portion to the closing portion 31. The upper chamber 32 a of the tubular part 32 communicates with the outside of the tubular part 32 through a condensation discharge hole 37. Thereby, the dew condensation generated in the upper chamber 32a is appropriately discharged to the outside, so that a good sliding operation between the upper guide shaft 20 and the cylindrical portion 32 can be maintained for a long time. The condensation discharge hole 37 does not need to be formed from the upper end portion of the cylindrical portion 32 to the closing portion 31. For example, only the portion of the cylindrical portion 32 located above the side portion of the closing portion 31 may be provided so as to penetrate in the radial direction, and the number thereof can be changed as appropriate.

  The upper guide shaft 20 of the cover body 3 and the lower guide shaft 19 of the support member 18 are slidably inserted into the chambers 32a and 32b of the cylindrical portion 32, respectively. The axial lengths of the guide shafts 19 and 20 are such that the lower end portion of the upper guide shaft 20 slightly protrudes into the upper chamber 32a of the valve body 30 when the valve is closed, as shown in FIG. As shown in FIG. 4B, the upper end of the lower guide shaft 19 slightly protrudes into the lower chamber 32b of the valve body 30 at the valve opening time when the valve body 30 is most raised. Is set to According to this, when the valve body 30 is moved up and down, the valve body 30 is held double by the guide shafts 19 and 20 and the contact amount is sufficient. As a result, the raising / lowering operation of the vent hole 16 by the valve body 30 is performed stably and smoothly.

  Further, since the recess 19a is formed in the lower guide shaft 19, a sufficient air flow path is ensured when the valve body 30 is raised and lowered, and the outer peripheral surface of the lower guide shaft 19 and the valve body 30 are The amount of contact with the inner peripheral surface is reduced. Even if the contact amount is reduced in this way, the valve body 30 is held in the upper and lower directions as described above, so that there is no hindrance to the raising / lowering operation. The raising / lowering operation of the body 30 becomes even better.

  The drainage vent valve 1 according to the present embodiment is configured as described above. The drainage vent pipe A to which the drainage vent valve 1 is connected is arranged, for example, in a wall space such as a detached house or an apartment house, and is connected to each floor via a drainage main pipe, a drainage branch pipe and a trap. Connected to drainage facilities such as toilets, bathrooms and washrooms.

  The vent 16 of the drainage vent valve 1 is normally closed. That is, the valve body 30 is lowered by its own weight, the packing 35 is seated on the valve seat 17, and the vent 16 is closed. In this case, since the packing 35 can be elastically deformed, the packing 35 and the valve seat 17 are in close contact with each other in a pressure contact state. Further, the packing 35 is integrally formed on the outer peripheral edge of the flange portion 33, and the cylindrical portion 32 of the valve body 30 is closed by the closing portion 31. Therefore, it is possible to reliably prevent the odor in the exhaust pipe for drainage from leaking outside through the vent hole 16.

  On the other hand, when a negative pressure greater than the weight of the valve body 30 is generated in the drainage vent pipe A during drainage of the drainage facility, the valve body 30 rises while being guided by the guide shafts 19 and 20. As a result, the pressure contact state between the packing 35 and the valve seat 17 is released, and the vent 16 is opened. And since air required for waste_water | drain is introduce | transduced from the vent hole 16, while the trap seal water of a drainage facility is protected, it drains smoothly.

  When the drainage is completed, the negative pressure state in the drainage vent pipe A is eliminated, so that the valve body 30 is lowered again by its own weight. At that time, since the valve body 30 moves along the guide shafts 19 and 20, the valve body 30 can be accurately and smoothly closed. Thereby, since the packing 35 is pressed against the valve seat 17, the vent hole 16 is reliably and firmly closed by the valve body 30. Even in such a series of drainage processes, the odor in the drainage vent pipe A does not leak to the outside.

  Moreover, since the drainage vent valve 1 according to the present embodiment has a very simple configuration as a whole, there is also a practical advantage that its manufacture can be performed easily and inexpensively.

  In the above embodiment, the guide shafts 20 and 19 provided on the main body 2 and the cover body 3 are used as the guide means for the valve body 30, but for example, a guide tube is provided on the main body 2 and the cover body 3 to provide a guide. It may be a means. In this case, instead of the cylindrical portion 32, the valve body 30 is formed with a shaft portion that is slidably inserted into the guide cylinder. However, when the guide means of the cover body 3 is constituted by the guide shaft 20 as in the above embodiment, the following advantages are obtained. In general, the cover body 3 is manufactured by injection molding a synthetic resin such as ABS resin. However, since the cover body 3 according to the present embodiment has the concave groove 11 on the lower inner peripheral surface, Thus, a so-called undercut portion is formed. Therefore, in an actual molding operation, the mold for molding the inner side of the cover body 3 is divided into a plurality of parts, and the predetermined mold is slid in a substantially horizontal direction to form the concave groove 11. Is done. In this case, the outer diameter dimension can be set to a smaller diameter when the guide means of the cover body 3 is constituted by the guide shaft 20 as in the above embodiment, rather than the guide cylinder. For this reason, there is an operational advantage that the mold can be attached and detached relatively easily in terms of space.

  Moreover, in the said embodiment, although the closed part 31 was provided in the cylindrical part 32 of the valve body 30 and the two chambers 32a and 32b were formed in the inside, the closed part 31 does not necessarily need to be provided.

  Furthermore, in the above embodiment, the plurality of recesses 19a are formed on the side surface so that the cross-sectional shape of the lower guide shaft 19 is substantially cross-shaped, but the number of recesses 19a is not limited to this, It can also be omitted. Therefore, the cross-sectional shape of the lower guide shaft 19 is not limited to a substantially cross shape. However, if the lower guide shaft 19 including the upper guide shaft 20 is formed in a substantially cross-shaped cross section, there is an advantage that sufficient strength can be secured, and an advantage that deformation such as warpage after molding can be suppressed. There is also.

  Furthermore, in the above embodiment, since the lower end portion of the lower guide shaft 19 is disposed at a position below the vent hole 16, the length of the lower guide shaft 19 can be sufficiently secured. The advantage that the raising / lowering amount of the valve body 30 can be set appropriately was obtained. However, the present invention is by no means limited to this. For example, as shown in FIG. 5A, the lower end portion of the lower guide shaft 19 may be arranged on the substantially same horizontal plane as the vent hole 16. Good. In this case, as shown in FIG. 5B, the support member 18 is disposed substantially horizontally at the vent 16. According to this, although the raising / lowering amount of the valve body 30 is slightly reduced, there is no practical problem.

  Moreover, in the said embodiment, although the vent hole 16 is obstruct | occluded using the dead weight of the valve body 30, you may make it provide the urging means which urges | biases the valve body 30 to the vent hole 16 side. . For example, as shown by a two-dot chain line in FIG. 2A, a coil spring 40 as an urging means is inserted into the upper guide shaft 20, and the valve body 30 is vented through the upper surface of the cylindrical portion 32. Energize 16 side. In this way, the closing performance of the vent hole 16 by the valve body 30 is further improved, and the valve closing operation can be performed quickly and reliably. In particular, in the present invention, the stability of the lifting and lowering operation of the valve body 30 is achieved, so that the function of the urging means can be used effectively. In adopting the urging means, it is desirable to select the coil spring 40 having an appropriate elastic force while sufficiently considering the magnitude of the negative pressure generated in the drainage vent pipe A. However, in this case, the biasing means is not limited to the coil spring 40.

  In addition, the specific configuration such as the shape of each part constituting the drainage vent valve 1 can be arbitrarily changed within the intended scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Drain valve for drainage 2 Main body 3 Cover body 15 Connection port 16 Vent port 17 Valve seat 19, 20 Guide shaft (guide means)
19a Concave part 30 Valve body 31 Closure part 32 Cylindrical part 32a Upper chamber 32b Lower chamber 37 Condensation discharge hole A Drain vent pipe

Claims (6)

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 main body having a connection port connected to the drainage vent pipe, and a vent port for introducing air;
A cover provided on the main body;
A valve body that is supported by a valve seat when the valve is closed, and is provided so as to be movable up and down to open and close the vent.
The drainage vent valve characterized in that the main body and the cover body each have guide means for guiding the valve body when the valve body is moved up and down.   The drainage vent valve according to claim 1, wherein a cylindrical portion is formed at the center of the valve body, and the guide means is a guide shaft that is slidably inserted into the cylindrical portion.   The drainage vent valve according to claim 2, wherein a concave portion is formed in the axial direction on a side surface of the guide shaft over the entire length.   The drainage vent valve according to claim 2 or 3, wherein the cylindrical portion is divided into two chambers, an upper chamber and a lower chamber, by a closing portion, and a guide shaft is slidably inserted into each chamber.   The drainage vent valve according to claim 4, wherein the upper chamber communicates with the outside of the cylindrical portion through a condensation discharge hole formed in the cylindrical portion. The drainage vent valve according to any one of claims 2 to 5, wherein a lower end portion of a guide shaft provided in the main body is disposed at a position below the vent hole.

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