JP4841477B2 - Air valve for water pipe - Google Patents

Description

  The present invention relates to a water pipe air valve, and more particularly to a water pipe air valve that discharges air mixed in the water pipe.

An example of a conventional air valve of this type is disclosed in Patent Document 1. In the technique of Patent Literature 1, a valve chamber is formed by a valve casing, an inlet is provided in the lower part of the valve chamber, and an exhaust port is provided in the upper part. A hole is formed above the valve chamber. A valve seat member having a communication hole communicating with the valve chamber and the exhaust port is attached to the valve chamber, and a slidable cylindrical exhaust valve body is disposed in the communication hole. A through hole is formed in the exhaust valve body, and one of the through holes is opened in the valve chamber, and the other is opened in the hole. A float is attached to the exhaust valve body. At the upper part of the float, around the opening of one of the through holes, a cylindrical wall having a seal ring attached to the entire periphery of the upper end and having an orifice hole is provided. Further, the exhaust valve body is provided with an exhaust valve hole at a position that communicates with the exhaust port when the float is lowered and is located in the hole portion when the float is raised. In such a technique of Patent Document 1, when water flows into the valve chamber, the exhaust valve body rises with the rise of the float, and the exhaust valve hole is closed by the hole, so that the outflow of water to the exhaust port is prevented. Is done. Further, the cylindrical wall and the seal ring prevent water from entering the exhaust valve body and the gap between the exhaust valve body and the communication hole.
Patent No. 2835683 [F16K 24/04]

  However, the cylindrical wall and the seal ring cannot completely prevent the intrusion of water, so that there is a possibility that the water enters the exhaust valve body. Further, water may enter the exhaust valve body from the orifice hole or the exhaust port. In the technique of Patent Document 1, once water enters the exhaust valve body, the infiltrated water stays in the exhaust valve body, so that the weight of the exhaust valve body increases and the buoyancy due to the float becomes insufficient. The operation cannot be executed.

  In addition, if water enters the gap between the exhaust valve body and the communication hole, foreign matter such as mud contained in the water adheres to the exhaust valve body and the sliding ring, and the slidability of the exhaust valve body decreases. .

  Therefore, a main object of the present invention is to provide a water pipe air valve that can reliably perform a predetermined operation in conjunction with fluctuations in the water level in the water pipe.

The invention of claim 1 is a water pipe air valve attached to a vertical pipe standing on a water pipe, wherein the valve lid is connected to the upper end of the vertical pipe , and the inside and outside of the water pipe provided on the valve lid. A valve seat having an opening communicating with the exhaust, an exhaust port provided slidably in the opening and formed at a position above the upper surface of the valve lid, and an air hole formed at or near the bottom And a shaft formed in a hollow cylindrical shape having a bottom, having an air passage communicating the exhaust port and the air hole , a float provided on the shaft such that the upper end surface is located below the bottom of the shaft, and the float This is a water pipe air valve provided with a valve body portion whose upper surface is in contact with the lower surface of the valve seat portion to cut off the communication of the opening portion.

In the first aspect of the present invention, the water pipe air valve (10) includes a valve lid (12), and is connected to, for example, an upper end portion of a vertical pipe (102) erected on the water pipe (100) to supply water. The air mixed in the pipe is discharged to the outside. The valve lid is provided with a valve seat (22) having an opening (24). The opening communicates the inside and the outside of the water pipe, and the shaft (36) is slidably provided in the opening. The shaft is formed in a hollow cylindrical shape with a bottom, and an exhaust port (38) formed at a position above the upper surface of the valve lid, an air hole (40) formed at or near the bottom, and an exhaust port And an air passage (42) communicating with the air hole. Further, for example, a bowl-shaped valve body (50) is provided at the lower end of the outer surface of the shaft, and a float (56) is provided under the valve body. The float is provided on the shaft such that the upper end surface is positioned below the bottom of the shaft, and moves up and down in conjunction with fluctuations in the water level in the water pipe. When the float is descending, the air hole formed at or near the bottom of the shaft communicates the interior of the water pipe with the air path, and the air mixed in the water pipe is the air hole, air path and exhaust. It is discharged outside through the mouth. That is, when the float is descending, the opening communicates the inside and outside of the water pipe. On the other hand, when the float is rising, the upper surface of the valve body portion and the lower surface of the valve seat portion come into contact with each other, the communication of the opening is blocked, the air discharge is stopped, and the water is discharged to the outside. Is prevented. At this time, even if water enters the inside of the shaft, for example, the air hole is provided at or near the bottom of the shaft, so that the water that has entered the shaft is fed from the air hole when the float descends. It is discharged into the pipe.

  According to the first aspect of the present invention, even if water enters the shaft, the water escapes from the air holes and the water does not stay in the shaft. Therefore, the opening is opened and closed in conjunction with the fluctuation of the water level in the water pipe. Can be executed reliably.

The invention of claim 2 is dependent on the invention of claim 1, and the float is made of synthetic resin and has a cylindrical side wall .

The invention of claim 3 is dependent on the invention of claim 2 , and the float is formed in a cylindrical shape with a bottom .

The invention of claim 4 is dependent on the invention of any one of claims 1 to 3, wherein the valve lid is formed of a synthetic resin, and has a short cylindrical body part and a disk-like disk part. The screw is detachably attached to the vertical tube.

The invention of claim 5 is dependent on any one of the inventions of claims 1 to 4, and further includes a drop-off preventing member provided so as to protrude from the upper portion of the outer surface of the shaft, and the upper portion of the shaft is exposed to the outside.

In the invention of claim 5, the shaft (36) is provided with a drop-off prevention member (48). The drop-off prevention member is provided so as to protrude from the upper part of the outer surface of the shaft. When the float (56) is lowered, for example, it comes into contact with the upper end of the valve seat (22) and the shaft from the opening (24) Prevent falling out. The upper part of the shaft is exposed to the outside. Therefore, the operation of the shaft can be confirmed without disassembling the water pipe air valve (10). In addition, oil can be poured into the shaft without disassembling the water pipe air valve, and the slidability of the shaft can be improved.

  The invention of claim 6 is dependent on the invention of any one of claims 1 to 5, and the water supply pipe is an agricultural water pipe.

  In the invention of claim 6, the water pipe air valve (10) is provided in the agricultural water pipe and discharges air mixed in the agricultural water pipe. Therefore, the same effect as that of the invention of claim 1 is exhibited.

  According to this invention, since the air hole is provided in the bottom part of the shaft or in the vicinity of the bottom part, even if water enters the shaft, the water escapes from the air hole and the water does not stay in the shaft. Therefore, it is possible to reliably execute a predetermined operation for opening and closing the opening in conjunction with the fluctuation of the water level in the water pipe.

  The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

  Referring to FIG. 1, an air valve 10 according to an embodiment of the present invention is attached to a vertical pipe 102 erected on a water supply pipe 100 such as an agricultural water pipe, and air mixed in the water supply pipe 100 is used. Discharge.

  As shown in FIGS. 2 to 4, a water pipe air valve (hereinafter, simply referred to as “air valve”) 10 includes a valve lid 12 formed of a synthetic resin such as polyvinyl chloride. The valve lid 12 has a short cylindrical body portion 14 and a disc-shaped disc portion 16 provided at one end thereof. The inner diameter of the body portion 14 is set corresponding to the outer diameter of the vertical tube 102. A thread groove 18 is formed on the inner surface of the body portion 14, and the valve lid 12 can be attached to and detached from the longitudinal pipe 102 by screwing the thread groove 18 and a thread 104 formed on the outer peripheral surface of the longitudinal pipe 102. It is attached. Moreover, the outer surface of the trunk | drum 14 is formed so that it may wave in the circumferential direction, and becomes a shape which is easy to have when attaching the valve lid 12 to the vertical pipe 102, etc. Further, a rubber packing 20 is attached to the lower surface of the disc portion 16 along the inner surface of the body portion 14, and the vertical tube 102 and the valve lid 12 are connected in a watertight manner via the rubber packing 20. The

  A valve seat portion 22 formed of a metal such as brass or carbon steel is provided at the center of the disc portion 16 of the valve lid 12. The valve seat portion 22 includes a hollow cylindrical side wall 26 having a columnar opening 24 and a hollow hexagonal plate-like flange portion 28 formed so as to protrude from the lower end of the side wall 26 in a bowl shape. The lower surface of the flange portion 28 becomes the lower surface of the valve seat portion 22. The opening 24 communicates the inside and outside of the vertical pipe 102, that is, the inside and outside of the water supply pipe 100. A thread 30 is formed on the outer surface of the side wall 26 of the valve seat portion 22. When the valve seat portion 22 is provided in the disc portion 16 of the valve lid 12, a hole corresponding to the outer diameter of the side wall 26 of the valve seat portion 22 is formed in the center of the disc portion 16, and the valve seat is inserted into the hole from below. The side wall 26 of the part 22 is inserted. A fastener 34 such as a hexagonal bolt having a thread groove 32 corresponding to the thread 30 of the side wall 26 is attached to the side wall 26 of the valve seat portion 22 protruding upward from the hole. The valve seat portion 22 is fixedly attached to the disc portion 16 so as to sandwich the disc portion 16.

  The opening 24 is slidably provided with a hollow cylindrical shaft 36 (see FIG. 5) formed of a metal such as brass or carbon steel. The outer diameter of the shaft 36 is set to be substantially the same as the inner diameter of the opening 24, but is set slightly smaller than the inner diameter of the opening 24 in consideration of the slidability of the shaft 36. The upper end of the shaft 36 is opened above the upper surface of the valve lid 12, and an exhaust port 38 is formed there. Further, two air holes 40 having a circular cross section are formed in the lower portion of the side surface of the shaft 36, that is, in the vicinity of the bottom portion of the shaft 36. The air hole 40 is located at a position lower than the lower surface of the valve seat portion 22 when a float 56 described later is lowered, and is located at a position higher than the lower surface of the valve seat portion 22 when the float 56 is raised. It is formed. Further, an air passage 42 that connects the exhaust port 38 and the air hole 40 is formed in the shaft 36.

  As shown in FIG. 5A, a groove 44 extending in the axial direction from the upper end of the shaft 36 to a position above the air hole 40 is formed on the outer surface of the shaft 36. However, the shape of the groove 44 is not limited, and for example, as shown in FIG. Further, the groove 44 may be formed on the inner surface of the side wall 26 of the valve seat portion 22, that is, on the side surface of the opening portion 24.

  Further, two bolt holes 46 are formed in the upper part of the side surface of the shaft 36, and hexagon bolts are attached thereto. When the float 56 is lowered, the lower end of the hexagon bolt and the upper end of the valve seat portion 22 come into contact with each other. That is, this hexagon bolt is provided so as to protrude from the upper portion of the outer surface of the shaft 36 and functions as a drop-off preventing member 48 that prevents the shaft 36 from falling off the opening 24. As a result, the portion of the shaft 36 above the position where the drop-off prevention member 48 is provided is always exposed to the outside.

  In addition, a disc-shaped valve body portion 50 that protrudes like a bowl from the lower end of the outer surface of the shaft 36 is integrally formed at the bottom of the shaft 36 (see FIG. 5). A bolt hole 52 is formed in the center of the valve body 50, that is, in the center of the bottom of the shaft 36, and a float 56 described later is attached to the shaft 36 using a fixing member 54 such as a hexagon bolt.

  The float 56 is formed in a cylindrical shape with a synthetic resin such as polyvinyl chloride. A hole 58 is formed in the center of the upper surface of the float 56. When the float 56 is attached to the shaft 36, the fixing member 54 is inserted into the hole 58 and the bolt hole 52 from below the hole 58 via the spring washer and fixed by bolting.

  As described above, such an air valve 10 is connected to the water supply pipe 100 via the vertical pipe 102 and discharges air mixed in the water supply pipe 100. As shown in FIG. 3, when the float 56 is lowered, the air hole 40 of the shaft 36 is located at a position lower than the lower surface of the valve seat portion 22, and communicates the inside of the vertical tube 102 and the air passage 42. To do. Therefore, the air mixed in the water supply pipe 100 enters the air passage 42 from the vertical pipe 102 through the air hole 40 and is discharged to the outside through the exhaust port 38. That is, when the float 56 is descending, the opening 24 communicates the inside and the outside of the water pipe 100. On the other hand, when the water level inside the vertical tube 102 rises, the float 56 rises due to its buoyancy. As the float 56 rises, the shaft 36 also rises, and the lower surface of the valve seat portion 22 and the upper surface of the valve body portion 50 come into contact with each other as shown in FIG. Thereby, the communication of the opening 14 is blocked, the discharge of air is stopped, and the discharge of water to the outside is prevented.

  At this time, even if water enters the shaft 36, when the water level inside the vertical tube 102 falls, the shaft 36 also descends as the float 56 descends, so that the air hole 40 is connected to the valve seat 22. It is at a position lower than the lower surface. Since the air hole 40 is formed near the bottom of the shaft 36, the water that has entered the shaft 36 is discharged into the vertical tube 102 through the air hole 40.

  Therefore, according to this embodiment, water does not stay in the shaft 36, and the weight of the shaft 36 does not increase due to the water staying. Therefore, the opening 24 is opened and closed in conjunction with the fluctuation of the water level in the water supply pipe 100. It is possible to reliably execute a predetermined operation.

  Further, since a part of the shaft 36 is always exposed to the outside, the operation of the shaft 36 can be confirmed without disassembling the air valve 10. Further, oil can be supplied from a portion exposed to the outside of the shaft 36 without disassembling the air valve 10. Further, since the groove 44 is formed on the outer surface of the shaft 36, the oil is easily transmitted to the lower portion of the shaft 36, and the surroundings of the oil are improved. Therefore, if oil is supplied to the shaft 36 when performing maintenance of the air valve 10, the slidability of the shaft 36 can be improved, and a predetermined operation can be more reliably performed.

  Further, since the exhaust port 38 of the shaft 36 is positioned above the upper surface of the valve lid 12 and the shaft 36 is slid under atmospheric pressure, the air valve 10 can be appropriately operated even at a low pressure. Therefore, the air valve 10 is optimal for the water supply pipe 100 such as an agricultural water pipe having a generally low water pressure.

  In the above-described embodiment, when the float 56 is raised, the lower surface of the valve seat portion 22 and the upper surface of the valve body portion 50 are in direct contact with each other, but the present invention is not limited to this. For example, as shown in FIG. 6, a seal member 60 can be provided on the upper surface of the valve body 50 along the outer surface of the shaft 36. For the seal member 60, for example, a rubber O-ring may be used. As a result, when the float 56 is raised, the lower surface of the valve seat portion 22 and the upper surface of the valve body portion 50 come into contact with each other via the seal member 60, so that it is difficult for water to enter the inside and the outer surface of the shaft 36. In addition, the slidability of the shaft 36 is hardly lowered.

  Further, in each of the above-described embodiments, the valve lid 12 and the valve seat portion 22 are formed as separate members and are attached using the fasteners 34. However, the present invention is not limited to this. For example, the valve seat portion 22 may be attached to the valve lid 12 by welding or an adhesive, or the valve lid 12 and the valve seat portion 22 may be integrally formed in advance as shown in FIG. May be. Similarly, in each of the above-described embodiments, the shaft 36 and the valve body portion 50 are integrally formed, and the float 56 is attached thereto by the fixing member 54. However, the shaft 36, the valve body portion 50, and the float 56 are attached to each other. It may be formed as a separate member and connected later. Moreover, as shown in FIG. 7, the shaft 36, the valve body part 50, and the float 56 can also be integrally formed previously. Furthermore, as shown in FIG. 8, the upper surface of the float 56 may function as the valve body 50.

  Further, in each of the above-described embodiments, the shape of the float 56 is formed in a cylindrical shape, but the shape of the float is not limited to this. For example, as shown in FIG. 9, it may be formed in a cylindrical shape having a top and a bottom, or may be formed in a spherical shape or an elliptical spherical shape.

  Further, in each of the above-described embodiments, the shaft 36 is prevented from dropping out of the opening 24 by the drop-off preventing member 48 provided at the upper portion of the side surface of the shaft 36. However, the present invention is not limited to this. For example, as shown in FIG. 10, a cap member 62 can be provided on the upper portion of the shaft 36. The cap member 62 is formed, for example, in a cylindrical shape with a top, and an exhaust port 64 communicating with the outside is formed on the side surface. In this case, for example, a screw thread is formed on the upper part of the outer surface of the shaft 36, and a screw groove corresponding to the screw thread is formed on the inner surface of the cap member 62. The cap member 62 may be attached to the shaft 36 by screwing the thread of the shaft 36 and the thread groove of the cap member 62. When the float 56 is lowered, the lower end of the cap member 62 and the upper end of the valve seat member 22 come into contact with each other, and the shaft 36 is prevented from falling off from the opening 24.

  In addition, as shown in FIG. 11, the shaft 36 may be prevented from falling off by the valve lid 12 instead of providing the shaft 36 with the falling-off preventing member 48. Specifically, for example, the height of the body portion 14 of the valve lid 12 is set longer than the height from the upper end of the air hole 40 to the lower end of the float 56, and the center direction of the body portion 14 is set at the lower end of the body portion 14. A stopper portion 66 that protrudes toward is formed. Further, the outer diameter of the body portion 14 is set to a size corresponding to the inner diameter of the vertical tube 102. Then, the air valve 10 is connected to the vertical tube 102 so that the body portion 14 is fitted into the vertical tube 102. When the float 56 is lowered, the lower end of the float 56 and the upper surface of the stopper portion 66 are in contact with each other, and the shaft 36 is prevented from falling off from the opening 24. In addition, when connecting the air valve 10 to the vertical pipe 102, it may be connected in a screw type or may be connected using an adhesive or the like. Further, for example, by providing a hook-like engaging portion that protrudes from the upper portion of the outer surface of the body portion 14 and locking the engaging portion to the upper end of the vertical tube 102 via a rubber packing or the like, the air valve 10 and the vertical tube 102 may be connected.

  Further, in each of the above-described embodiments, the air hole 40 is provided in the lower portion of the side surface of the shaft 36. However, as shown in FIG. 12, the air hole 40 may be provided in the bottom portion of the shaft 36. In this case, since it is necessary to provide a space for communicating the air hole 40 and the inside of the vertical tube 102 below the air hole 40, for example, the shaft 36 using the fixing member 54 having a long shaft portion 54 a. And the float 56 may be connected. Further, the shaft 36 and the float 56 may be connected by interposing a spacer between the shaft 36 and the float 56.

  Note that the specific numerical values such as the diameter and height described above are merely examples, and can be appropriately changed as necessary.

It is an illustration figure which shows a mode that the air valve for water pipes of one Example of this invention is provided in the water pipe. It is a top view which shows the air valve for water pipes of FIG. It is sectional drawing which shows a state when the float of the water valve for water pipes of FIG. 1 is falling. It is sectional drawing which shows a state when the float of the air valve for water supply pipes of FIG. 1 is rising. (A) is a side view which shows an example of the shaft with which the air valve for water pipes of FIG. 1 is provided, (b) is a side view which shows another example of a shaft. It is sectional drawing which shows the air valve for water pipes of the other Example of this invention. It is sectional drawing which shows the air valve for water supply pipes of the further another Example of this invention. It is sectional drawing which shows the air valve for water supply pipes of the further another Example of this invention. It is sectional drawing which shows the air valve for water supply pipes of the further another Example of this invention. It is sectional drawing which shows the air valve for water supply pipes of the further another Example of this invention. It is sectional drawing which shows the air valve for water supply pipes of the further another Example of this invention. It is sectional drawing which shows the air valve for water supply pipes of the further another Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Air valve for water supply pipes 12 ... Valve cover 22 ... Valve seat part 24 ... Opening part 36 ... Shaft 38 ... Exhaust port 40 ... Air hole 42 ... Air path 44 ... Groove 48 ... Fall-off prevention member 50 ... Valve body 56 ... Float 60 ... Seal member 100 ... Water pipe 102 ... Vertical pipe

Claims (6)

A water pipe air valve attached to a vertical pipe installed on the water pipe,
A valve lid connected to the upper end of the vertical pipe ;
A valve seat provided on the valve lid and having an opening communicating the inside and the outside of the water pipe;
An exhaust port slidably provided in the opening and formed at a position above the upper surface of the valve lid, an air hole formed at or near the bottom, and the exhaust and the air hole; A shaft formed in a hollow cylindrical shape with a bottom, having an air passage communicating with
The float provided on the shaft so that the upper end surface is positioned below the bottom of the shaft, and when the float is raised, the upper surface abuts on the lower surface of the valve seat and the opening An air valve for a water supply pipe, comprising a valve body portion that cuts off the communication. The air valve for a water pipe according to claim 1 , wherein the float is made of a synthetic resin and has a cylindrical side wall . The water valve for a water pipe according to claim 2, wherein the float is formed in a cylindrical shape having a bottom and a bottom . The said valve lid is formed with a synthetic resin, has a short cylindrical body part and a disk-shaped disk part, and is detachably attached to the vertical pipe by screwing. The air valve for water pipes according to any one of 3 above. Further comprising a drop-off preventing member provided protruding from the upper outer surface of the shaft,
The upper part of the said shaft is an air valve for water pipes in any one of Claims 1 thru | or 4 exposed outside .   The air valve for a water pipe according to any one of claims 1 to 5, wherein the water pipe is an agricultural water pipe.

Images