JP6601961B2 - Air valve - Google Patents

Description

  The present invention relates to an air valve that is connected to a water pipe and performs intake and exhaust.

  Conventionally, air valves connected to water pipes have been widely used in various places. The air valve has an intake function that guides the atmosphere into the water pipe in order to efficiently drain tap water during installation, expansion, or replacement work of the water pipe. Because of the large exhaust (rapid exhaust) function that exhausts a large amount of air (including other gases) in the water pipe after the operation of the tap water for various reasons. A function (for example, Patent Documents 1 to 6) having a function of exhausting a small amount of air mixed in a water pipe little by little is generally used.

  An air valve generally has, as a basic structure, an intake / exhaust mechanism having a valve box connected to a water pipe, a large air hole, a small air hole, and an intake / exhaust passage communicating with the large air hole and the small air hole. And a float valve body arranged in the valve box and capable of closing the small air hole from below. The intake / exhaust mechanism usually has a lid body in which large air holes are formed and attached to the upper part of the valve box, and a floating valve body that can close the large air holes of the lid body from below. The hole is formed in the floating valve body or the lid body. The float valve element and the idle valve element have a specific gravity smaller than that of water, and the idle valve element is lighter than the float valve element. A separate repair valve having a cock portion for controlling the intrusion of water into the valve box is usually connected between the air valve and the water pipe.

  When exhausting a large amount of air, the air is rapidly exhausted through an intake / exhaust passage that passes through the lower opening of the large air hole and communicates therewith. The large amount of exhaust is performed until the cock of the repair valve is opened and water enters the valve box from the water pipe until the floating valve closes the lid from the bottom close to the lid. After a large amount of exhaust is completed, a small amount of exhaust is performed when air enters the water pipe through the water pipe and enters the air reservoir near the upper end of the float valve element. When exhausting a small amount, the air passes through a small air hole formed in the floating valve body or the lid body and is exhausted through an intake / exhaust passage communicating with the small air hole. When the air in the air reservoir near the upper end of the float valve body becomes sufficiently small, the float valve body comes to close the small air hole from below, and the exhaust is stopped.

  In addition to the function as an air valve, Patent Document 3 discloses an emergency use, for example, use as a temporary fire hydrant, water supply at the time of disaster, and investigation in a pipeline. When used for such applications, first, internal components such as a float valve body and an idle valve body of the air valve are taken out. After that, the male type cap of the plug-in type (Machino type) is installed. Then, a fire hose and an angle valve having a female die coupled to the male die can be connected to the male die to perform fire extinguishing and emergency water supply, respectively. In addition, an in-pipe investigation can be conducted by entering an in-pipe investigation camera, a pressure gauge, or the like.

  Patent Document 4 discloses an air valve in which a male base part in the shape of a plug-in male base part is formed in a part of an intake / exhaust passage.

  In addition, many air valves are installed outdoors (for example, valve chambers consisting of manholes and pits provided on the road). Depending on the usage and usage environment, rainwater (rainwater, flood, tsunami, Water that is not suitable for non-treated drinking water, such as flash water, may sometimes enter the air valve due to accumulation in the valve chamber. As a countermeasure, in Patent Document 5, after the air valve is changed from a large amount of exhaust to a small amount of exhaust, a plug body that closes the intake / exhaust passage from above at an appropriate time and does not disturb the function of the small amount of exhaust is disclosed. It is disclosed that it is placed so as to prevent rainwater and the like from entering from the outside.

JP-A-9-166234 JP 2003-139260 A JP 2012-255550 A Japanese Patent Laying-Open No. 2015-117827 JP 2013-036504 A JP 2014-152785 A

  By the way, as described in Patent Document 4, the air valve having the male base part that forms a part of the intake / exhaust passage is tall, but the male valve is separately provided for use as a temporary fire hydrant. You do not have to carry the mold base. However, the air valve is in an intake state when rainwater, etc. accumulates in the valve chamber and is submerged, or when the tap water pressure drops below the head pressure of rainwater, etc., accumulated in the valve chamber due to a power failure or failure of water-related equipment. It becomes. Even if the air valve having the male base part is covered with a cover body or the like and the air layer is secured above the male base part when the upper part of the male base part is submerged, Rainwater collected in the valve chamber easily enters the intake / exhaust passage from the upper opening of the male base together with air in the air layer, and also enters the water pipe from the valve box of the air valve. Therefore, it becomes easy to invite a secondary disaster.

  The present invention has been made in view of the above-mentioned reasons, and the object thereof is an air valve having a male base part that forms a part of an intake / exhaust passage, and has an ability to prevent entry of rainwater and the like from the outside. The object is to provide a high structure air valve.

In order to achieve the above object, the air valve according to claim 1 is an air valve connected to a water pipe through which tap water flows, and exhausts air mixed in the water pipe to the outside. A male base having a valve box to be connected, a large air hole, a small air hole, and an intake / exhaust passage communicating with the large air hole and the small air hole, and a part of the intake / exhaust path is formed; An intake / exhaust mechanism provided; and a float valve element disposed in the valve box and capable of closing the small air hole from below, and capable of closing the intake / exhaust passage, An inner space that communicates with the small air hole in a state where the road is blocked, and a plurality of second small air holes that penetrate a wall that forms the inner space, and the second small air hole is It includes a plug body backflow prevention body capable of blocking is further provided, wherein the backflow prevention member is closely with a predetermined elastic force to the outer surface of the wall A closed ring-shaped elastic body capable of closing the second small air holes, each of the plurality of second small air holes being radially formed, and all of them are caused by the outflowing air. The closed ring-shaped elastic bodies provided outside the plurality of second small air holes are densely provided so as to be spread in one direction .

  The air valve according to claim 2 is the air valve according to claim 1, wherein the intake / exhaust mechanism is provided with a lid main body portion in which the large air hole is formed, and the male base portion. A lid attached to an upper portion of the valve box; and a floating valve body capable of closing the large air hole of the lid body portion from below, wherein the small air hole is the floating valve body or the lid body. It is formed in the part.

  The air valve according to claim 3 is the air valve according to claim 2, wherein the lid main body portion includes a lid main body inner portion with which the floating valve body can contact from below, and the lid main body inner portion is removable. It is characterized by comprising an outer part of the lid body.

The air valve according to claim 4 is the air valve according to any one of claims 1 to 3 , wherein all the centers of the plurality of second small air holes are around a center point of the elastic body. It is provided within a range of 10 degrees to 45 degrees.

The air valve according to claim 5 is the air valve according to claim 4 , wherein all the centers of the plurality of second small air holes are in the range of 25 to 35 degrees around the center point of the elastic body. It is provided in the inside.

The air valve according to claim 6 is the air valve according to any one of claims 1 to 5 , further comprising a cover body provided so as to cover the upper side of the large air hole , characterized in that it is mounted on the lower side of the front Symbol cover.

An air valve according to a seventh aspect of the present invention is the air valve according to the sixth aspect , wherein the long plate member has a reinforcing bridge bent in a U-shaped cross section, and the reinforcing bridge includes the cover body and the plug. It is characterized by being sandwiched between the body.

The air valve according to claim 8 is the air valve according to any one of claims 1 to 5 , wherein the male die portion includes a large-diameter cylindrical portion provided at an upper end portion and a small-diameter on the lower side thereof. The plug body has a claw portion, and the claw portion is biased by a spring and can come into contact with the small-diameter cylindrical portion.

  According to the present invention, in the air valve having a male base part that forms a part of the intake / exhaust passage, the stopper can enhance the ability of preventing rain water and the like from entering from the outside.

It is (a) front view and (b) sectional view of an air valve concerning an embodiment of the present invention. It is sectional drawing which shows two states at the time of small amount exhaustion of an air valve same as the above. It is a top view for demonstrating mounting | wearing operation | movement of the cover body of an air valve same as the above, (a) is the state before rotation of a cover body, (b) is the state after rotation of a cover body. It is sectional drawing which shows two states after mounting | wearing the plug body at the time of small amount exhaustion of an air valve same as the above. It is a cross-sectional enlarged partial view which shows one state after mounting | wearing with the plug body at the time of small amount exhaustion of an air valve same as the above. It is a cross-sectional enlarged partial view which shows another state after mounting | wearing the plug body at the time of small amount exhaustion of an air valve same as the above. It is an enlarged view of the plug body of the same air valve, wherein (a) is a plan view, (b) is a side view, and (c) is a bottom view. It is sectional drawing which cut | disconnected the plug body of the air valve same as the above with the line shown by BB, Comprising: (a) expands and shows (b) further expanding. It is a cross-sectional enlarged partial view which shows one state after mounting | wearing with the plug body at the time of the small amount exhaust of the example which used the reinforcement bridge in the air valve same as the above. The reinforcement bridge in an air valve same as the above is shown, (a) is a top view, (b) is a front view, (c) is sectional drawing. It is a cross-sectional enlarged partial view when a female die is coupled when the air valve is used for emergency use. It is a cross-sectional enlarged partial view which shows the modification of the cover body of an air valve same as the above. It is a sectional enlarged partial view showing a modification Katachirei the plug body of the same air valve.

Hereinafter, modes for carrying out the present invention will be described. The air valve 1 according to the embodiment of the present invention is connected to a water pipe through which tap water flows, and can exhaust the air mixed in the water pipe to the outside. As shown in FIGS. 1 to 7, the air valve 1 has a valve box 2 connected to a water pipe, a large air hole 3 a, a small air hole 7 a, and these large air holes 3 a and small air holes as a basic structure. An intake / exhaust mechanism having an intake / exhaust passage 3b communicating with 7a and provided with a male base part 32 in which a part of the intake / exhaust passage 3b is formed; and a small air hole 7a provided in the valve box 2 A float valve body 6 which can be closed from below, and which can close the intake / exhaust passage 3b, and which is connected to the small air hole 7a in a state where the intake / exhaust passage 3b is closed; And a one or a plurality of second small air holes 8b penetrating through the wall 80a forming the inner space 8a, and provided with a backflow prevention body 81 capable of closing the second small air holes 8b. A body 8 is further provided. Here, the intake / exhaust mechanism includes a lid body portion 31 in which a large air hole 3a is formed and the male base portion 32 described above, and a lid body 3 mounted on the upper portion of the valve box 2, and the lid The floating valve body 7 is configured to close the large air hole 3 a of the main body 31 from below, and the small air hole 7 a is formed in the floating valve body 7. The float valve element 6 and the floating valve element 7 have a specific gravity smaller than that of water, and the idle valve element 7 is lighter than the float valve element 6. Further, the backflow prevention body 81 of the plug body 8 can be exhausted from the inner space 8a to the outside, and the second small air hole 8b is sealed so as to prevent intrusion of rainwater or the like from the outside into the inner space 8a. Is functional.

  A more specific structure of the air valve 1 can be as follows.

  The valve box 2 has a vent 2a at its upper end, a water vent 2b at its lower end, a hollow portion 2c inside the vent 2a, and a water guide 2d below it. Moreover, the valve box 2 has two levers 21 and 21 in the circumferential direction of the outer surface thereof. The lever 21 has a portion of a lever operating portion 21a that is operated by touching the lever 21 and a portion of an engaging portion 21b that can be pressed against an engaging groove 31ba described later of the lid 3 (FIG. 1). (See (b) and FIG. 5). Further, the valve box 2 has two recessed portions 2e on which two insertion portions 31bb (to be described later) of the lid 3 can be placed, and grooves (not shown) formed in the circumferential direction from each of them (FIG. 3). (Refer to (a) and (b)). Further, the valve box 2 is normally used by connecting a separate repair valve 100 having a cock portion for controlling water intrusion into the hollow portion 2c between the air valve 1 and the water pipe. Instead of the repair valve 100, a cock function may be provided in the vicinity of the water inlet 2b of the valve box 2.

  The lid body 31 of the lid 3 is attached to the vent 2 a of the valve box 2. As described above, the large air hole 3a is formed in the lid body 31 and the intake / exhaust passage 3b is formed in the male base 32, but the large air hole 3a and the intake / exhaust passage 3b are continuous. There is no need to set the boundary. The male die part 32 and the lid main body part 31 (more specifically, a lid main body outer part 31b described later) can be joined by screwing, for example, by forming a screw thread at the joint location.

  The lid main body portion 31 includes a lid main body inner portion 31a with which the floating valve body 7 can contact from below, and a lid main body outer portion 31b fitted so that the lid main body inner portion 31a is fixed inside. The lid body 31 may be configured so that the lid body inner portion 31a and the lid body outer portion 31b cannot be separated, that is, integrally formed.

The large air hole 3a in the lid body 31 is formed in the lid body inner portion 31a. An O-ring 31aa is provided on the lower end surface of the lid body inner portion 31a so that the floating valve body 7 can be satisfactorily brought into close contact (see FIG. 5). Instead of the O-ring 31aa, an O-ring may be provided on the upper end surface of the floating valve body 7 at the corresponding position.

  On the outer surface of the lid main body outer portion 31b, a concave engaging groove 31ba is formed in an annular shape (see FIG. 5) to which the engaging portion 21b of the lever 21 can be pressed. In addition, two insertion portions 31bb that protrude slightly outward are formed at the peripheral edge near the upper surface of the lid main body outer portion 31b (see FIGS. 3A and 3B).

  The male die part 32 has a function of a plug-type (Machino type) male die. That is, the male die part 32 is a part to which the female die 10 (see FIG. 11) can be coupled, and a large-diameter cylindrical part 32a provided at the upper end part for locking the female die 10 and the lower part thereof. A small-diameter cylindrical portion 32b on the side. The female die 10 has a fire hose, a stand pipe, an angle valve or the like for connection. Further, the male die part 32 has an unlocking part (push wheel) 32 c for releasing the locking of the female die 10. Specifically, the unlocking portion 32c is movable in the vertical direction outside the small-diameter cylindrical portion 32b, and the collar portion 32ca (see FIG. 5) is pushed toward the large-diameter cylindrical portion 32a so as to be female. The locking with the base 10 can be released. The intake / exhaust passage 3b in the male base part 32, that is, the vicinity of the upper opening of the intake / exhaust passage 3b of the lid 3 is wide due to water flow during fire extinguishing and emergency water supply described later. In addition, it makes it easier to conduct in-pipe investigations and washing operations, which will be described later.

  The lid 3 is mounted so that the insertion portion 31bb is positioned in the recess 2e of the valve box 2 (see FIG. 3A), and the portion below the insertion portion 31bb is the vent of the valve box 2. 2a (see FIG. 1 etc.). Then, the lid 3 is rotated (clockwise in FIGS. 3A and 3B), and the insertion portion 31bb is inserted into the groove (not shown) formed in the circumferential direction from the recess 2e of the valve box 2. (See FIG. 3B). Then, the levers 21 and 21 are tilted so that the engaging portions 21b and 21b press the engaging groove 31ba of the lid 3 from both sides (see FIG. 5).

  The structure of the lid 3 can be modified. This modification will be described in detail later.

  The air valve 1 includes a cover body 4 provided to cover the upper side of the intake / exhaust passage 3b. The cover body 4 has a cylindrical shape with a top portion, and is, for example, a valve from the lateral direction by a screw 41 with a handle (see FIG. 1A) and / or from the upper side by two bolts (or nuts) 42. Can be attached to the box 2.

  The air valve 1 includes a valve body guide 5 disposed in the hollow portion 2 c of the valve box 2. The valve body guide 5 has a bottomed cylindrical shape and has a window hole 5a through which air and water can flow. The window hole 5a is provided at an appropriate position on the bottom or side. The float valve body 6 and the floating valve body 7 are arranged inside the valve body guide 5.

  The float valve body 6 has a substantially cylindrical shape, and the length in the vertical direction is longer than the length (diameter) in the horizontal direction, that is, is long. Further, the upper end portion 6a is tapered in a truncated cone shape, and the upper end surface 6aa which is the tip thereof is substantially flat (see FIG. 5). The higher the flatness of the upper end surface 6aa, the easier it is to come into close contact with the valve seat 71 (see FIG. 5) of the floating valve body 7, but on the other hand, the upper end face 6aa is in a fixed state with the valve seat 71 and is less likely to be separated. In some cases, it may have a slight curvature.

  The idle valve body 7 is generally disc-shaped and has a recess 7b (see FIG. 5) formed on the lower surface. At the center of the concave portion 7b, a slightly projecting downward so as to be in close contact with the float valve body 6 and having a substantially flat surface and an elastic valve seat 71, the small air hole 7a described above is provided. It is formed through the center of the valve seat 71 vertically. The concave portion 7b is sized such that the upper end portion 6a of the float valve body 6 can enter with a margin so that the float valve body 6 can contact the valve seat 71. Further, a through hole 7c (see FIG. 5) is formed in the lateral direction so that air can pass from the outer peripheral surface of the idle valve body 7 to the recess 7b. Further, the floating valve body 7 has a convex portion 7d (see FIG. 5) formed at the center of the upper end surface thereof, and this convex portion 7d is formed in the large air hole 3a of the lid body 3 (lid body portion 31). It is smaller than that so that it can enter.

  The plug body 8 is used by being mounted between the lid body 3 and the cover body 4 as shown in FIGS. 4 to 6 when the air valve 1 is in a small amount of exhaust state. That is, after a large amount of exhaust is initially performed, the cover body 4 is removed, the plug body 8 is placed so as to close the intake / exhaust passage 3b, and the cover body 4 is attached again to mount the plug body 8. At that time, the stopper 8 is pressed against both the lid 3 and the cover 4 so as to be in close contact with both of them without any gap and fixed so as not to move up and down. Therefore, the contact portion between the lid 3 and the plug 8 is in a state where air does not leak. In addition, a plug body lifting / lowering control mechanism (for example, the one described in Patent Document 6) is separately provided so that the plug body 8 can be lowered or raised together with the cover body 4 or the cover body 4 as a reference. It is also possible to attach the plug body 8 so as to close the upper part of the large air hole 3a when the 8 is lowered.

  As shown in FIG. 7, the plug body 8 is formed with a base portion 80 having an inner space portion 8 a that opens downward. The base 80 is generally generally cylindrical as shown in FIG. When the plug body 8 is in close contact with the lid body 3, the intake / exhaust passage 3 b is closed, and the inner space 8 a communicates with the small air hole 7 a of the floating valve body 7. A part of the base 80 is a wall 80a that forms the inner space 8a, and a second small air hole 8b that penetrates from the inner space 8a to the outer surface of the wall 80a is formed. There are one or more second small air holes 8b. Therefore, when the plug 8 is in close contact with the lid 3, the inner space 8a has no air passage other than the second small air hole 8b and the small air hole 7a. In addition, although the inner space part 8a may penetrate vertically, in that case, it is necessary to make it the state which does not leak between the plug body 8 and the cover body 4. FIG.

  As described above, the second small air hole 8b is provided with the backflow prevention body 81 that can block the second small air hole 8b. The backflow prevention body 81 can be a ring-shaped elastic body that can close the second small air hole 8b by being in close contact with the outer surface of the wall 80a forming the inner space 8a with a predetermined elastic force. The diameter of the wire diameter of the backflow prevention body 81 is larger than the diameter of the second small air hole 8b and can be closed. The backflow prevention body 81 is expanded by the outer surface of the wall 80a and is always in a tensioned state (a stretched state), and thereby is in close contact with a predetermined elastic force. More specifically, a ring-shaped recess is formed at the position of the opening portion of the second small air hole 8b on the outer surface of the wall 80a, and the backflow prevention body 81 is fitted therein. As the backflow prevention body 81, an elastic ring body (for example, an O-ring as shown in FIG. 7 or the like, a strip-shaped ring body having a thin cross-sectional shape, or a ring body having a square cross-sectional shape). Can be used. Moreover, although the planar view shape of the plug body 8 and the ring-shaped backflow prevention body 81 is usually circular, it is not limited to this shape, and may be elliptical or polygonal.

  In the case where a plurality of second small air holes 8b are provided, all of the plurality of second small air holes 8b are such that the elastic body 81 is pushed and expanded in one direction by the outflowing air as illustrated in FIG. It is preferable that they are provided densely. Accordingly, the elastic body 81 is air that flows out from each of the second small air holes 8b and is surely spread in one direction according to the pressure of the inner space 8a. The outer surface of the wall 80a, more specifically, the ring-shaped recess is surely in close contact. As a result, the air valve 1 can perform a stable and responsive exhaust operation with respect to the set pressure, and has a high sealing performance by the elastic body 81 except for the exhaust operation, and can prevent rainwater and the like from entering from the outside. Can be high. On the other hand, if a plurality of second small air holes 8b are provided in a dispersed manner, the elastic body 81 is independently pushed and expanded by the air flowing out from each of the second small air holes 8b. It is pushed out in the direction and is easily separated from the outer surface of the wall 80a of the plug body 8, more specifically from the ring-shaped recess. In that case, depending on the pressure of the inner space 8a, the elastic body 81 is likely to be displaced or detached from the ring-shaped recess.

  Each of the plurality of second small air holes 8b is preferably formed radially. This is because the air flowing out from each of the plurality of second small air holes 8b is applied to the elastic body 81 as vertically as possible so that the air can be easily spread.

  All of the second small air holes 8b are dense as described above, and their centers P are provided within a limited range (angle) θ. All the centers P of the second small air holes 8b are preferably provided within the range θ of 10 degrees to 45 degrees around the center point C of the elastic body 81, and more preferably within the range θ of 25 degrees to 35 degrees. Is good. When the range θ in which all the centers P of the second small air holes 8b are provided is less than 10 degrees, the number of the second small air holes 8b having a good response to the set pressure is formed without impairing the sealing performance. Is no longer easy. When the range θ in which all the centers P of the second small air holes 8b are provided is larger than 45 degrees, the possibility that the elastic body 81 is displaced increases.

The number of the second small air holes 8b is preferably 2 to 6, more preferably 3 to 5. When the number of second small air holes 8b to one, resulting increased need to increase the diameter of the second small air hole 8 b in order to improve a response to the set pressure, Then, such sealability It is easy to become unpreferable at a point. Further, when the number of the second small air holes 8b is 7 or more, the diameter of the second small air holes 8b is set so as not to exceed the preferable range where all the centers P of the second small air holes 8b are provided as much as possible. The necessity of reducing the size is increased, and providing a large number of holes having a very small hole diameter is not preferable in terms of workability (ease of manufacturing, maintenance, etc.).

  The plug body 8 is preferably made of a synthetic resin such as an ABS resin having moderate flexibility so that the plug body 8 can be easily mounted between the lid body 3 and the cover body 4. As shown in FIG. 7 and the like, it is preferable to use a packing made of rubber or the like (for example, an O-ring) 82 so that the air does not leak well.

  The structure of the plug 8 can be modified. This modification will be described in detail later.

  Further, the plug body 8 is firmly pressed downward by the cover body 4 so that it does not shift upward even when the pressure in the inner space 8a increases. Therefore, a strong upward pressure is applied to the portion where the plug body 8 is located at the top of the cover body 4. In order to prevent the cover body 4 from being deformed by this pressure, for example, the thickness of the top of the cover body 4 is increased, ribs or the like are formed on the cover body 4, or reinforcement is performed as shown in FIG. It is preferable that the bridge 9 is sandwiched between the cover body 4 and the plug body 8. The reinforcing bridge 9 is suitable when the plug body 8 is attached to an existing air valve and used as the air valve 1. Specifically, as shown in FIGS. 10A to 10C, the reinforcing bridge 9 is bent in a U-shaped cross section so that a long plate material has both flange portions 9a and 9a. Is. The pressure from the plug body 8 is absorbed by both flange portions 9a, 9a. The reinforcing bridge 9 is preferably fixed to the cover body 4 with double-sided tape or the like in order to prevent displacement.

  The exhaust operation of the air valve 1 is as follows. Before water enters the hollow portion 2c of the valve box 2 from the water pipe through the repair valve 100, that is, before a large amount of exhaust is performed, as shown in FIG. 1B, the floating valve body 7 and the float valve body 6 is the state which overlapped on the bottom part of the valve body guide 5. FIG. The plug 8 is stored elsewhere. When the cock of the repair valve 100 is opened and water enters the hollow portion 2c of the valve box 2 from the water pipe through the repair valve 100, the air in the hollow portion 2c of the valve box 2 becomes the side of the valve body guide 5 and the like. The air is pushed by the water pressure while passing through the window hole 5a, and is rapidly exhausted (a large amount of exhaust) from the large air hole 3a. At the same time, the floating valve body 7 and the float valve body 6 rise as the water level rises. As a result, the floating valve body 7 comes into close contact with the lid body 3 and closes the large air hole 3a (see FIG. 2 (a) and the like).

  After a large amount of exhaust is completed in this way, a small amount of exhaust is performed. A relatively small amount of air is accumulated between the floating valve element 7 and the float valve element 6, and the float valve element 6 is pushed down by the air reservoir A together with the draft line as shown in FIG. On the other hand, the floating valve body 7 remains pushed up. Then, the air is discharged to the outside of the valve box 2 (a small amount of exhaust) through the small air hole 7a. When the air in the air reservoir A decreases, as shown in FIG. 2 (b), the float valve body 6 rises and closes to the floating valve body 7 to close the small air hole 7 a, and the valve box 2 is hollow. The part 2c is sealed. Thereafter, when air enters the hollow portion 2c of the valve box 2 from the water pipe through the repair valve 100 and enters the water, and the air in the air reservoir A increases again, a small amount of air is exhausted again.

  After exhausting a small amount, the plug 8 is mounted between the lid 3 and the cover 4 at an appropriate time. Specifically, if necessary, the cock of the repair valve 100 is closed, the screw 41 with the handle and the bolt 42 are removed from the valve box 2, the cover body 4 is removed, and then the plug body 8 so as to block the intake / exhaust passage 3b. When the cover body 4 is attached again and the cock of the repair valve 100 is closed, the cock of the repair valve 100 is then opened. The operation of a small amount of exhaust after mounting the plug 8 is as follows. When air enters the hollow portion 2c of the valve box 2 from the water pipe into the hollow portion 2c of the valve box 2 and enters the air, and the air in the air reservoir A increases, as shown in FIGS. 6 is pushed down, while the floating valve body 7 remains pushed up. Then, air enters the inner space 8a of the plug 8 from the small air hole 7a.

  When the air discharged from the small air hole 7a of the floating valve body 7 accumulates in the inner space 8a (and the intake / exhaust passage 3b) of the plug body 8 and becomes higher than a preset pressure (set pressure), the second A ring-shaped backflow preventer 81 that is in close contact with the outside of the small air hole 8b with a predetermined elastic force is spread. If it does so, a clearance gap will be made between the backflow prevention body 81 and the wall 80a, and the air of the inner space part 8a will flow out from the 2nd small air hole 8b, and will be discharged | emitted outside the valve box 2. FIG. The set pressure of the inner space 8a is determined in consideration of the pressure of the hollow portion 2c of the valve box 2.

  When the air in the air reservoir A decreases, as shown in FIGS. 4 (b) and 6, the float valve body 6 rises and comes into close contact with the floating valve body 7 to close the small air hole 7a. 2 hollow part 2c will be in a sealed state. At the same time, when the air pressure in the inner space 8a becomes lower than the set pressure, the backflow prevention body 81 closes the second small air hole 8b, and the inner space 8a is also completely sealed. Thereafter, when air enters the hollow portion 2c of the valve box 2 from the water pipe through the repair valve 100 and enters the water, and the air in the air reservoir A increases again, a small amount of air is exhausted again.

  Thus, when the external pressure is lower than the pressure of the hollow portion 2c of the valve box 2, the air valve 1 to which the plug 8 is attached can appropriately perform a small amount of exhaust operation.

  On the other hand, when rainwater or the like tries to enter from the outside due to the head pressure of rainwater or the like accumulated in the valve chamber, the large intake / exhaust passage 3b is blocked by the plug body 8, and the second small air hole 8b is tensioned. Since the backflow prevention body 81 is closed tightly in the state of being applied, intrusion of rainwater or the like is prevented. Therefore, the blocking capability of the air valve 1 is very high and does not weaken even if the air valve 1 is tilted.

  As described above, the air valve 1 has a simple structure and a high blocking capability against the intrusion of rainwater or the like from the outside even if the vicinity of the upper opening of the air intake / exhaust passage 3b of the lid 3 is wide.

  When the air valve 1 is used in an emergency, for example, as a temporary fire hydrant, water supply in a disaster, investigation in a pipeline, washing pipe work, the cock of the repair valve 100 is closed in advance, After removing the plug body 8, the lid body 3, the valve body guide 5, the float valve body 6, and the floating valve body 7, the lid body 3 is mounted again. In this state, as shown in FIG. 11, a fire base hose, a stand pipe, an angle valve, or the like can be connected by joining the female base 10 to the male base 32 of the lid 3 from above. When a fire hose or a stand pipe is connected and the cock of the repair valve 100 is opened, the fire can be extinguished. When the angle valve is connected and the cock of the repair valve 100 is opened, water supply at the time of disaster becomes possible. In addition, with the lid 3 mounted again, the cock of the repair valve 100 is opened, and an in-pipe investigation camera, a pressure gauge, or the like is entered to conduct an in-pipe investigation or a washing tube operation. Is possible.

  Next, a modified example of the structure of the lid 3 will be described. As shown in FIG. 12, the lid main body 31 can be configured such that the lid main body inner portion 31 a and the lid main body outer portion 31 b can be easily detached. In that case, the lid main body inner portion 31a and the lid main body outer portion 31b are usually joined by screwing by forming a screw thread at the joining portion. Then, even if the lid body inner portion 31a is large, by removing the lid body inner portion 31a during the above-described emergency use, the vicinity of the lower opening of the large air hole 3a of the lid body 3 is enlarged, It is possible to prevent the water flow from being interrupted during emergency water supply, and from interfering with in-pipe investigations and washing pipe work. In FIG. 12, a packing 31c is provided above the joint portion between the lid body inner portion 31a and the lid body outer portion 31b.

  Next, a modified example of the structure of the plug 8 will be described.

Shown to stopper 8C in FIG. 13 has a pawl portion 85, the claw portion 85 of the lower large-diameter cylindrical portion 32a of the male die portion 32 of the cover 3 is urged by a spring 85a diameter By being in contact with the cylindrical portion 32b, the male die portion 32 is locked. The above-described packing 82 is provided at a position in contact with the outside of the large-diameter cylindrical portion 32 a of the male die portion 32. A rubber band 86 is provided outside the claw portion 85 (via the base portion 80). In other words, the portion 8d of the plug 8C that closes the male cap 32 of the lid 3 and closes the intake / exhaust passage 3b is substantially the same as the female cap 10 that is inserted into the male cap of the insertion type (machino type). It has a simple structure. Therefore, the cover body 8C may use the cover body 4 and can close the intake and exhaust passage 3b in close contact with the male base portion 32 of the lid body 3 without using the cover body 4. Other portions of the plug body 8C (such as a portion around the second small air hole 8b) can have the same structure as the plug body 8 described above.

Since the plug body 8C can be mounted and fixed to the lid body 3 by the claw portion 85 without using the cover body 4, the plug body 8C depends on the use situation and the use environment in addition to the cover body 4 being provided. The present invention can also be applied to a specially shaped air valve with the cover body removed or the cover body does not originally exist. In addition, it is also possible to use fixtures (for example, a screw, a bolt, a nut, etc.) as other things which attach and fix a plug to the lid 3 without using the cover 4.

  The air valve according to the embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and various designs within the scope of the matters described in the claims. It can be changed. Accordingly, the present invention can be applied to air valves having various shapes and structures other than the air valve 1. For example, it can of course be applied to an air valve in which a small air hole is formed in the floating valve body as in Patent Documents 1 and 3 to 6, and the small air hole is a lid (as in Patent Document 2 above). The present invention can also be applied to an air valve formed on the lid body.

DESCRIPTION OF SYMBOLS 1 Air valve 2 Valve box 2a Valve box vent 2b Valve box water flow port 2c Valve box hollow part 2d Valve box water guide part 3 Lid body 31 Lid main body part 31a Lid main body inner part 31b Lid main body outer part 32 Male type Base part 3a Large air hole 3b Intake / exhaust passage 4 Cover body 5 Valve body guide 6 Float valve body 7 Floating valve body 7a Small air hole
Center of 8,8C stopper 8a in an empty portion 8b second small air holes 80a in the hollow portion forms a wall 81 backflow prevention member 9 reinforcing bridge 10 female die P second small air holes

Claims (8)

An air valve connected to a water pipe through which tap water flows and exhausts the air mixed in the water pipe to the outside,
A valve box connected to the water pipe;
An intake / exhaust mechanism having a large air hole, a small air hole, and the large air hole, an intake / exhaust passage communicating with the small air hole, and provided with a male base part in which a part of the intake / exhaust path is formed When,
A float valve body arranged in the valve box and capable of closing the small air hole from below;
With
The intake / exhaust passage can be blocked, and an inner space portion communicating with the small air hole in a state where the intake / exhaust passage is closed, and a plurality of second small holes penetrating through a wall forming the inner space portion. An air hole, and further includes a plug body provided with a backflow prevention body capable of closing the second small air hole ,
The backflow prevention body is a closed ring-shaped elastic body that can close the second small air hole by closely contacting the outer surface of the wall with a predetermined elastic force,
Each of the plurality of second small air holes is formed in a radial shape, and all of them are formed in the closed ring shape provided outside the plurality of second small air holes by the outflowing air. An air valve characterized by being densely provided so that an elastic body is spread in one direction . The air valve according to claim 1,
The intake / exhaust mechanism includes a lid body portion in which the large air hole is formed, the male base portion, a lid body that is mounted on the upper portion of the valve box, and a large air hole in the lid body portion A floating valve body that can be closed from below,
The small air hole is formed in the floating valve body or the lid main body part. The air valve according to claim 2,
The air valve according to claim 1, wherein the lid body portion is composed of an inner portion of the lid body with which the floating valve body can contact from below and an outer portion of the lid body from which the inner portion of the lid body can be removed. The air valve according to any one of claims 1 to 3 ,
The center of all of the plurality of second small air holes is provided within a range of 10 degrees to 45 degrees around the center point of the elastic body. The air valve according to claim 4 ,
The center of all these 2nd small air holes is provided in the range of 25 to 35 degree | times around the center point of the said elastic body, The air valve characterized by the above-mentioned. In the air valve according to any one of claims 1 to 5 ,
A cover body provided so as to cover the upper side of the large air hole;
The plug, the air valve, characterized in that mounted on the lower side of the front Symbol cover. The air valve according to claim 6 ,
An air valve characterized in that a long plate member has a reinforcing bridge bent in a U-shaped cross section, and the reinforcing bridge is sandwiched between the cover body and the plug body. In the air valve according to any one of claims 1 to 5 ,
The male die part has a large-diameter cylindrical part provided at the upper end part and a small-diameter cylindrical part below it,
The plug body has a claw portion, and the claw portion is biased by a spring so as to come into contact with the small-diameter cylindrical portion.

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