JP2018009706A - Vent valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vent valve capable of enhancing adhesion between a valve element and a valve seat.SOLUTION: In a bottom wall part 11a in a housing 11 forming a valve chamber 15, an opening 14 communicating with a branch pipe 13 of a drain pipe and suction ports 16 for sucking the outside air are provided. A cylindrical valve seat 17 is formed around the suction port 16, and a disk-shaped valve element 20 is supported to be openable and closeable with respect to the valve seat 17. The valve element 20 ordinarily lies on the valve seat 17 to close the valve, and the valve element 20 is configured to be separated from the valve seat 17 to open the valve when the pressure in the valve chamber 15 is reduced. A cylindrical shaft support tube 18 is supported at the central portion of the valve seat 17, and in the shaft support tube 18, a support shaft 21 provided at the central part of the valve element 20 is supported vertically movably. A through hole of the shaft support tube 18 is formed in a tapered hole 24 that becomes larger in diameter as it goes downward.SELECTED DRAWING: Figure 4

Description

  In the present invention, for example, when drainage suddenly flows through a drainage pipe of a building and the inside of the drainage pipe is in a negative pressure state, the valve body supported by the valve seat is separated from the valve seat by the negative pressure and enters the drainage pipe. The present invention relates to a vent valve device for sucking air and eliminating a negative pressure state.

  The drainage pipes provided in the building are connected to drainage facilities such as a restroom, kitchen, and bath. These drainage facilities are each provided with a drainage trap in order to prevent odors from rising in the drainage pipe. However, if the drainage water suddenly flows in the drainage pipe, the inside of the drainage pipe becomes negative pressure, the sealing water of the drain trap is sucked out and flows out, and odor may flow into the room from the drainage pipe . For this reason, a vent pipe communicating with the drain pipe is provided by branching from the drain pipe, and a vent valve is provided at the opening of the vent pipe to eliminate the negative pressure state in the drain pipe.

  This type of vent valve is disclosed in Patent Document 1, for example. That is, the vent valve is in close contact with the valve body, the valve body having an opening formed on the bottom surface of the valve chamber and communicating with the drain pipe, the intake port for sucking outside air and the valve seat, the valve body, and the valve seat. Equipped with packing. The valve body is always in close contact with the valve seat through the packing, and when the inside of the drain pipe reaches a negative pressure state, the valve body is separated from the valve seat and sucks air.

JP 2000-329245 A

  An object of the present invention is to provide a vent valve device capable of enhancing the adhesion between a valve body and a valve seat.

  In order to achieve the above object, a vent valve device according to a first aspect of the present invention has an opening communicating with a drain pipe and an intake port for sucking outside air at a bottom portion in a housing forming a valve chamber. An annular valve seat is formed around the intake port, and a disc-like valve body is supported to be openable and closable with respect to the valve seat, and the valve body is always positioned on the valve seat and is closed. And a vent valve configured to open the valve body away from the valve seat when the pressure in the valve chamber is reduced, and a cylindrical shaft support tube is supported at the center of the valve seat, and the shaft support tube Inside, a support shaft provided at the center of the valve body is supported so as to be movable up and down, and the through hole in the shaft support tube is a tapered hole whose diameter increases toward the bottom.

  According to a second aspect of the present invention, in the vent valve device according to the first aspect, the support shaft of the valve body and the tapered hole are in line contact with each other at an entrance portion of the tapered hole.

  According to the vent valve device of the present invention, when the support shaft of the valve body is inserted into the taper hole, the valve body can be inclined, and the entire circumference of the valve body can be in close contact with the valve seat.

FIG. 3 is an exploded perspective view showing a pair of ventilation valves provided in the housing in the ventilation valve device of the first embodiment. The top view which shows the valve seat of a ventilation valve. Sectional drawing which shows the valve closing state of a ventilation valve. (A) is sectional drawing which shows the valve closing state of a ventilation valve, (b) is sectional drawing which shows the valve opening state of a ventilation valve. The perspective view which shows the ventilation valve of 2nd Embodiment. The top view which shows the valve seat of a ventilation valve. Sectional drawing in the 7-7 line | wire of FIG. The disassembled perspective view which decomposes | disassembles and shows one vent valve among a pair of vent valves in 3rd Embodiment.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS.
As shown in FIGS. 1 and 4 (a), a bottom wall portion 11a of a housing 11 in which a pair of vent valves 10 is housed is formed in a bottomed rectangular frame shape, and a drain pipe branch (not shown) is formed at the center thereof. A cylindrical portion 13 connected to the pipe 12 is projected, and the cylindrical portion 13 is provided with an opening 14 communicating with the drain pipe. Further, the upper wall portion 11b constituting the housing 11 is formed in a covered rectangular box shape and is fitted to the bottom wall portion 11a to form a valve chamber 15 as a sealed chamber inside.

  As shown in FIG. 2 and FIG. 4B, a pair of air inlets 16 having a planar circular shape are provided on both sides of the opening 14 in the bottom wall portion 11a so that outside air can be sucked. Yes. An annular valve seat 17 is provided around the intake port 16. A cylindrical shaft support cylinder 18 is supported at the center of the valve seat 17 by three support plates 19 extending in the radial direction.

  As shown in FIG. 3, a support shaft 21 provided at the center of a disc-shaped valve body 20 is supported in the shaft support cylinder 18 of the valve seat 17 so as to be vertically movable. The valve body 20 is in close contact with or separated from the valve seat 17 with the packing 22 and the packing presser 23 interposed therebetween. The packing 22 has the same diameter as the valve body 20 and is held on the lower surface of the valve body 20 by a packing presser 23. The through hole in the shaft support cylinder 18 becomes a tapered hole 24 whose diameter increases toward the lower part, and is configured to be tiltable when the support shaft 21 of the valve body 20 is inserted into the taper hole 24. It can come into close contact with the seat 17. Further, since the shaft support cylinder 18 has a tapered hole 24, the support shaft 21 of the valve body 20 and the tapered hole 24 are in line contact with each other at the entrance. Therefore, the support shaft 21 is not easily caught in the tapered hole 24, and the vent valve 10 can be opened and closed smoothly.

  As shown in FIG. 1, a plurality (9 in the first embodiment) of guide grooves 25 extending radially from the center to the periphery are formed at equal intervals in the circumferential direction on the upper surface of the valve body 20. The valve body 20 is always positioned on the valve seat 17 via the packing 22 and is closed. When the pressure in the valve chamber 15 is reduced, the valve body 20 is opened away from the valve seat 17 and can be opened and closed. It is configured. In the closed state of the valve body 20, the packing 22 is interposed between the valve body 20 and the valve seat 17 to improve the sealing performance between the valve body 20 and the valve seat 17, and the odor in the valve chamber 15 is reduced. It is designed not to leak outside.

  A plurality of first guide grooves 26 extending in parallel in the vertical direction are formed on the outer peripheral surface of the valve seat 17 at regular intervals. The first guide groove 26 guides condensed water downward from between the valve seat 17 and the valve body 20, that is, to a region other than between the valve seat 17 and the valve body 20 in the valve chamber 15. Yes.

  The valve seat 17 has an upper outer peripheral surface provided with an inclined surface 27 that is inclined so as to be reduced in diameter toward the upper portion, and the inclined surface 27 is formed so as to extend upward from the first guide groove 26. 28 is provided. Condensed water generated between the valve seat 17 and the valve body 20 is drawn into the second guide groove 28 provided on the inclined surface 27 of the valve seat 17, and is further provided on the outer peripheral surface of the valve seat 17. One guide groove 26 is drawn.

The vent valve device includes the valve seat 17, the first guide groove 26, the second guide groove 28, the valve body 20, the housing 11, the valve chamber 15, and the like.
The operation of the vent valve device according to the first embodiment configured as described above will be described.

  As shown in FIG. 4A, when the drainage facility is used and the drainage flows in the normal state in the drain pipe, the inside of the valve chamber 15 should be kept at the same pressure (normal pressure) as the outside air. Therefore, the valve body 20 is supported on the valve seat 17 and the ventilation valve 10 is closed. Therefore, the sealing water of the drain trap in each drainage facility does not flow out, and there is no possibility that the odor leaks to the outside.

  At this time, since the inside of the shaft support cylinder 18 of the valve seat 17 is a tapered hole 24 whose diameter increases toward the lower part, the support shaft 21 of the valve body 20 can be inclined in any direction of 360 degrees. The entire circumference of 20 is in close contact with the valve seat 17. Furthermore, since the packing 22 is attached to the lower surface of the valve body 20, the adhesion between the valve body 20 and the valve seat 17 is enhanced. For this reason, it is suppressed that the odor in a drain pipe leaks outside.

  As shown in FIG. 4 (b), when drainage suddenly flows in the drainage pipe due to the use of drainage equipment, negative pressure is generated upstream of the drainage pipe, and the inside of the valve chamber 15 is in a reduced pressure state. As a result, the support shaft 21 of the valve body 20 rises in the shaft support cylinder 18, the valve body 20 is lifted and separated from the valve seat 17, and the vent valve 10 is opened. For this reason, air is sucked from the intake port 16, and the air flows from the opening 14 through the branch pipe 12 to the drain pipe through the vent valve 10 as shown by the arrow in FIG. For this reason, the reduced pressure state in the drain pipe is eliminated, the sealing water of each drain trap is not affected, and the leakage of odor is suppressed.

When the inside of the drain pipe returns to normal pressure, the inside of the valve chamber 15 also becomes normal pressure, the valve body 20 descends by its own weight and reaches the valve seat 17, the vent valve 10 is closed, and the outside Odor leakage is suppressed.
In the closed state of the vent valve 10, when the outside air temperature is low, such as in the winter, the air present between the valve seat 17 and the valve body 20 of the vent valve 10 is cooled and dew condensation occurs when the dew point is reached. Arise. The water generated by this condensation is drawn into the second guide groove 28 provided on the inclined surface 27 on the upper part of the valve seat 17 by capillary action, and further into the first guide groove 26 on the outer peripheral surface of the valve seat 17. It is drawn by the phenomenon. For this reason, it is suppressed that condensed water accumulates between the valve seat 17 and the valve body 20. As a result, a situation in which condensed water freezes between the valve seat 17 and the valve body 20 and the valve body 20 adheres to the valve seat 17 is avoided. Therefore, the opening operation of the vent valve 10 is performed without any trouble.

The effects exhibited by the above first embodiment will be described collectively below.
(1) In the vent valve device according to the first embodiment, the first guide groove 26 is provided on the outer peripheral surface of the valve seat 17. For this reason, when condensed water is generated between the valve seat 17 and the valve body 20, the condensed water can be guided to the first guide groove 26 of the valve seat 17. Therefore, there is no possibility that the valve body 20 adheres to the valve seat 17, and the valve opening function is maintained.

Therefore, according to the vent valve device of the first embodiment, the valve body 20 can be prevented from sticking to the valve seat 17 and the valve opening function can be exhibited without hindrance.
(2) Since the first guide groove 26 is provided in plural (many), freezing of condensed water can be effectively suppressed over the entire circumference between the valve seat 17 and the valve body 20.

(3) The plurality of first guide grooves 26 are provided at equal intervals. For this reason, the dew condensation water can be uniformly guided to the first guide groove 26 over the entire circumference between the valve seat 17 and the valve body 20.
(4) The valve seat 17 is formed in a cylindrical shape, the valve body 20 is formed in a disc shape, and an inclined surface 27 is provided on the upper outer peripheral surface of the valve seat 17 so that the diameter of the valve seat 17 is reduced toward the upper portion. A first guide groove 26 is formed on the outer peripheral surface of the valve seat 17, and a second guide groove 28 connected to the first guide groove 26 is provided on the inclined surface 27. Therefore, the dew condensation water generated between the valve seat 17 and the valve body 20 can be smoothly guided to the first guide groove 26 via the second guide groove 28.

  (5) A guide groove 25 extending from the center to the periphery is provided on the upper surface of the valve body 20. For this reason, the dew condensation water which accumulates on the upper surface of the valve body 20 can be guided downward from the periphery of the valve body 20 via the guide groove 25.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, parts different from the first embodiment will be mainly described.

  As shown in FIGS. 5 and 6, a third guide groove 29 that communicates with the first guide groove 26 and the second guide groove 28 is provided at the boundary between the outer peripheral surface of the valve seat 17 and the inclined surface 27. It is formed over. And the dew condensation water which exists on the inclined surface 27 of the valve seat 17 is comprised so that this 3rd guide groove 29 may be guide | induced. Further, the condensed water that has entered the second guide groove 28 of the inclined surface 27 can also enter the third guide groove 29. Note that the bottom surface of the guide groove 25 on the upper surface of the valve body 20 has a slope that becomes lower toward the outer peripheral side, and the condensed water on the upper surface of the valve body 20 is promptly guided to the outer peripheral side.

  As shown in FIGS. 5 and 7, the third guide groove 29 is formed in the same shape as the first guide groove 26 and the second guide groove 28, and the width and depth of the third guide groove 29 are the same as the first guide groove 29. The width and depth of the groove 26 and the second guide groove 28 are set to be the same.

  Now, in winter, when the vent valve 10 is closed, the air present in the vicinity of the position between the valve seat 17 and the valve body 20 is cooled below the dew point to generate moisture. The moisture is located from the second guide groove 28 provided on the inclined surface 27 of the valve seat 17 to the first guide groove 26 on the outer peripheral surface of the valve seat 17 or the boundary between the inclined surface 27 and the outer peripheral surface of the valve seat 17. It is drawn into the third guide groove 29. Alternatively, moisture present on the inclined surface 27 of the valve seat 17 is drawn into the third guide groove 29 or the second guide groove 28.

  As described above, in the vent valve device of the second embodiment, the third guide groove 29 is provided in addition to the first guide groove 26 and the second guide groove 28 of the first embodiment. Water can be guided to the third guide groove 29, and water guided to the second guide groove 28 can also be guided to the third guide groove 29, and condensed water can be dispersed and guided downward. . Therefore, the dew condensation water can be efficiently guided downward, the dew condensation water remains between the valve seat 17 and the valve body 20, the dew condensation water freezes, and the valve body 20 is fixed to the valve seat 17. Can be avoided. Therefore, there is no possibility that the opening operation of the vent valve 10 will be hindered.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. In the third embodiment, portions different from the first embodiment will be mainly described.

  As shown in FIG. 8, a V-shaped fourth guide groove 30 is provided instead of the second guide groove 28 provided on the inclined surface 27 of the valve seat 17 in the first embodiment, and the fourth guide is provided. The lower end portion of the groove 30 is configured to be continuous with the first guide groove 26. For this reason, the third guide groove 30 and the first guide groove 26 form a Y-shaped groove. The fourth guide groove 30 is formed in the same cross-sectional shape as the first guide groove 26, and the width and depth of the fourth guide groove 30 are set to be the same as the width and depth of the first guide groove 26. The number of first guide grooves 26 is set to be smaller than the number of first guide grooves 26 of the first embodiment.

  In the winter, when the vent valve 10 is closed, the air present between the valve seat 17 and the valve body 20 or in the vicinity thereof is cooled below the dew point to generate moisture. The moisture is guided from the fourth guide groove 30 provided on the inclined surface 27 of the valve seat 17 to the first guide groove 26 on the outer peripheral surface of the valve seat 17. Alternatively, moisture present on the inclined surface 27 of the valve seat 17 is drawn into the fourth guide groove 30.

  Thus, in the vent valve device of the third embodiment, instead of the second guide groove 28 of the first embodiment, the fourth guide groove 30 extending obliquely on the inclined surface 27 so as to form a V shape is provided. Therefore, the condensed water on the inclined surface 27 can be easily guided to the third guide groove 30, and the water collected in the fourth guide groove 30 can be guided to the first guide groove 26. For this reason, dew condensation water can be guide | induced efficiently below and the situation where the valve body 20 adheres to the valve seat 17 by freezing of dew condensation water can be avoided. Therefore, the valve opening operation of the vent valve 10 can be performed satisfactorily.

It should be noted that the embodiment described above can be modified and embodied as follows.
The first guide groove 26, the second guide groove 28 of the first embodiment, the third guide groove 29 of the second embodiment, and the fourth guide groove 30 of the third embodiment are configured so that the opening side is widened. Or the bottom surface of the groove may be formed in a circular arc shape, or the side surface of the groove may be formed in a step shape.

-At least one of the first guide groove 26, the second guide groove 28 of the first embodiment, the third guide groove 29 of the second embodiment, and the fourth guide groove 30 of the third embodiment is set to a different shape. Also good.
-About the 4th guide groove 30 of 3rd Embodiment, the angle of the V-shape may be changed suitably, the shape may be formed in a U shape, or it may be formed in an X shape. In addition, when forming in X shape, the two lower end parts of the 4th guide groove 30 are comprised so that it may continue to the 1st guide groove 26 which adjoins, respectively.

The valve seat 17 may be formed in a rectangular tube shape such as a rectangular tube shape. A first guide groove 26 is formed on the outer peripheral surface of the valve seat 17 having such a shape.
The inclined surface 27 of the valve seat 17 may be omitted.

  -In 3rd Embodiment, you may comprise so that the 2nd guide groove 29 of 2nd Embodiment may be provided. In this case, the condensed water can be discharged more efficiently.

DESCRIPTION OF SYMBOLS 10 ... Ventilation valve, 11 ... Housing, 14 ... Opening part, 15 ... Valve chamber, 16 ... Inlet, 17 ... Valve seat, 18 ... Shaft support cylinder, 20 ... Valve body, 21 ... Support shaft, 24 ... Tapered hole.

Claims (2)

The bottom of the housing forming the valve chamber has an opening communicating with the drain pipe and an intake port for sucking outside air. An annular valve seat is formed around the intake port, and the valve seat is The disc-shaped valve body is supported to be openable and closable, and the valve body is always positioned on the valve seat and closed, and the valve body is opened away from the valve seat when the pressure in the valve chamber is reduced. Vented vent valve,
A cylindrical shaft support cylinder is supported at the center of the valve seat, and a support shaft provided at the center of the valve body is supported in the shaft support cylinder so as to be movable up and down. A vent valve device in which the through hole in the support cylinder is a tapered hole with a diameter increasing toward the bottom. The vent valve device according to claim 1, wherein the support shaft of the valve body and the tapered hole are in line contact with each other at an entrance portion of the tapered hole.

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