JP2014178035A - Air valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air valve in which assembling work including maintenance work and decomposing work can be carried out more easily.SOLUTION: This air valve 1X comprises: a valve box 2 having an aeration port 2a at its upper end and having a hollow part 2c at its lower inner part; a lid body 3 having a large air hole 3a adjacent to the aeration port 2a and installed at the valve box 2; a valve body guide 5 arranged at the hollow part 2c; a float valve body 6 arranged inside the valve body guide 5; and a free moving valve body 7 arranged above the float valve body and having a small air hole 7a adjacent to the large air hole 3a. The lid body 3 has a lower cylindrical part 3b that extends to fit into the hollow part 2c. The outer surface of the lower cylindrical part 3b is formed with a recessed engaging groove 3c. The valve box 2 is provided with a lever 22 rotatably that has at its outer surface an operating part 22a and at its other surface an engaging part 22b that can be press contacted against the engaging groove 3c, and in the lever 22, at the first position, an engaging part 22b is press contacted to the engaging groove 3c and at the second position, the engaging part 22b is moved away from the engaging groove 3c, respectively.

Description

  The present invention relates to an air valve that discharges air accumulated inside a water pipe to the outside of the pipe.

  In general, water pipes such as water pipes and agricultural water pipes are designed so that air (including other gases mixed in the air in this specification) accumulates therein and does not hinder water flow. Is provided with an air valve for discharging air out of the pipe. FIG. 11 shows a conventional general air valve, which is the same as the conventional air valve described in Patent Document 1 invented by the present inventor. 11A is a front view, and FIG. 11B is a cross-sectional view. This air valve 101 has a vent 102a at the upper end, a water passage 102b at the lower end, a hollow portion 102c inside the lower portion of the vent 102a, and a water guide portion 102d below the vent 102b. A valve box 102 connected to the water pipe 100, a lid 103 having a large air hole 103a for exhausting air facing the vent 102a of the valve box 102, and a valve body 102, A valve body guide 105 disposed in the hollow portion 102c of the box 102; a spherical float valve body 106 disposed inward of the valve body guide 105; And a floating valve body 107 having a small air hole 107 a facing the large air hole 103 a of the lid body 103. More specifically, the valve box 102 has a cock 124 at an intermediate portion of the water guide portion 102d. The lid 103 includes a separate outer lid 103A, an upper inner lid 103Ba, and a lower inner lid 103Bb, and lid fixing bolts 141, 141,... And nuts 142, 142,. It is fixed to the valve box 102 by Further, the valve body guide 105 has window holes through which air and water can be circulated at appropriate positions on the upper side and the bottom of the side part. The floating valve body 107 has a valve seat 171 that protrudes slightly downward at the center, and a small air hole 107a is formed in the valve seat 171. Patent Document 1 proposes obtaining an effect such as downsizing by devising a spherical float valve element 106 as a columnar float valve element.

  The operation of the air valve 101 is as follows. That is, when the cock 124 attached to the valve box 102 is opened, the air in the water conduit 100 and the valve box 102 is rapidly exhausted (large amount of exhaust) from the large air hole 103a due to the water pressure. When water enters the hollow portion 102c of the valve box 102 from the water conduit 100, the floating valve body 107 and the float valve body 106 rise as the water level rises. As a result, as shown in FIG. 12A, the floating valve body 107 is in close contact with the lower inner lid body 103Bb to close the large air hole 103a, and the float valve body 106 is in close contact with the floating valve body 107 to In order to close the small air hole 107a, the hollow portion 102c of the valve box 102 has an air reservoir A and a water reservoir W up and down, and is completely sealed. After such a sealed state, when air enters the hollow portion 102c of the valve box 102 through the water pipe 100 and enters the hollow portion 102c, the pressure of the air pool A in the hollow portion 102c of the valve box 102 increases, and the water is retreated. The water level goes down. The float valve body 106 descends as the water level falls, while the floating valve body 107 remains pushed up by the internal pressure of the air reservoir A. Then, as shown in FIG. 12 (b), the float valve body 106 is separated downward from the floating valve body 107, and the air is discharged to the outside of the valve box 102 through the small air hole 107a and the large air hole 103a ( Exhausted under pressure). Then, the water level rises again, and the hollow portion 102c of the valve box 102 is completely sealed as shown in FIG.

  In such an air valve 101, due to adhesion of dust or the like, the small air hole 107 a remains open without being blocked by the float valve body 106, and water leaks, or conversely, the floating valve body 107 and the float valve body 106. Even if the water level drops, the float valve element 106 does not descend and the small air hole 107a remains blocked, and air may not be discharged. For this reason, maintenance work is performed urgently or when a failure occurs, and at that time, the air valve 101 is disassembled.

JP 2005-61618 A

  However, since the outer lid body 104 is fixed to the valve box 102 using a plurality of lid body fixing bolts 141, 141,..., Each time, using a tool, as shown in FIG. Valve 101 must be disassembled. That is, as shown in FIG. 13A, the nuts 142, 142,... Are removed from the lid fixing bolts 141, 141,. , The lid fixing bolts 141, 141,... Are loosened and removed, and the upper inner lid body 103Ba and the lower inner lid body 103Bb are removed. And as shown in FIG.13 (c), the valve body guide 105, the float valve body 106, and the floating valve body 107 are taken out from the hollow part 102c of the valve box 102. FIG. Thereafter, when the inspection, cleaning, or repair work is completed, the valve body guide 105, the float valve body 106, and the floating valve body 107 are returned to the hollow portion 102c of the valve box 102, and the lower inner lid body 103Bb and the upper inner lid body are returned. 103Ba and the outer lid 103A are attached to the valve box 102 and fixed with lid fixing bolts 141, 141,. As described above, disassembling the air valve 101 in maintenance work is very complicated.

  On the other hand, the air valve 101 is installed in a manhole or a water pipe bridge on the road. However, since the traffic is temporarily stopped in the work in the manhole, the maintenance work needs to be performed quickly although it is complicated as described above. There is.

  The present invention has been made in view of the above reasons, and an object of the present invention is to provide an air valve capable of more easily and quickly performing assembly and disassembly work including maintenance work.

  In order to achieve the above object, the air valve according to claim 1 has a vent at the upper end, a water vent at the lower end, a hollow portion inside the vent, and a water guide below the vent. A valve body having a large air hole facing the vent of the valve box and attached to the valve box, a valve body guide disposed in a hollow portion of the valve box, A floating valve body disposed in the direction of the valve body, and a floating valve body that is disposed inward of the valve body guide and above the float valve body, and has a small air hole facing the large air hole of the lid body, In the air valve comprising: the lid body is formed by extending a lower cylindrical portion that fits into a hollow portion of the valve box, and forming a concave engagement groove on an outer surface of the lower cylindrical portion. Is provided with a lever having an operating portion on one side and an engaging portion that can be pressed against the engaging groove of the lid on the other side of the outer surface. The lever is characterized in that the engaging portion is pressed against the engaging groove of the lid at the first position, and the engaging portion is separated from the engaging groove of the lid at the second position. To do.

  The air valve according to claim 2 is a valve box having a vent at the upper end and a water vent at the lower end, a hollow part inside the vent and a water guide part below the vent, and the valve box A lid that has a large air hole facing the air vent and is attached thereto, a valve body guide disposed in a hollow portion of the valve box, and a float valve body disposed inward of the valve body guide And a floating valve body that is disposed inward of the valve body guide and above the float valve body and has a small air hole facing the large air hole of the lid body, The box is formed with a hole through which the hollow portion and the outside can be communicated so that air is ejected when the floating valve body and the float valve body are fixed, and water is ejected when the floating valve body is not fixed. And

  The air valve according to claim 3 is the air valve according to claim 1, further comprising a lever cover that covers the outside of the lever and is detachably attached to the valve box. And

  The air valve according to claim 4 is the air valve according to claim 3, wherein the lever cover is formed with a cover fixing hole, and the floating valve body is fixed to the valve box. A hole that allows the hollow portion and the outside to communicate with each other is formed so that air is blown out while water is blown out, and a screw is screwed into the hole of the valve box through the cover fixing hole. Thus, the lever cover is attached to the valve box.

  According to a fifth aspect of the present invention, in the air valve according to any one of the first to fourth aspects, the float valve body has a long and substantially cylindrical shape, and an upper end portion is formed in a truncated cone shape. It is characterized by.

  The air valve according to claim 6 is the air valve according to any one of claims 1 to 5, wherein an insertion portion is formed in the lid, and the insertion portion is inserted into the valve box by rotating the insertion portion. Insertion grooves are formed in the circumferential direction.

  The air valve according to a seventh aspect of the present invention is the air valve according to any one of the first to sixth aspects, wherein a rectifying hole having a diameter smaller than that of the water guiding portion is provided in the center below the bottom of the valve body guide. A current plate is provided.

  According to the air valve of the present invention, the lid is fixed and released by rotating the lever of the valve box without using a tool, or the hollow portion is communicated with the outside before the lid is removed. Therefore, assembly and disassembly work including maintenance work can be easily and quickly performed.

It is (a) front view and (b) sectional view of an air valve concerning a 1st embodiment of the present invention. It is sectional drawing explaining the screw etc. for fixing the cover of an air valve same as the above. It is sectional drawing explaining operation | movement of an air valve same as the above. It is an expanded fragmentary sectional view explaining a motion of the float valve body of an air valve same as the above. It is sectional drawing which shows the decomposition | disassembly procedure of an air valve same as the above. It is (a) front view of the air valve which concerns on the 2nd Embodiment of this invention, (b) It is sectional drawing. It is sectional drawing explaining the screw etc. for fixing the cover of an air valve same as the above. It is a top view explaining mounting | wearing operation | movement of the cover body of an air valve same as the above. It is sectional drawing which shows the decomposition | disassembly procedure of an air valve same as the above. It is sectional drawing explaining the case where an air valve same as the above is used as a temporary fire hydrant. It is the (a) front view of the conventional air valve, (b) It is sectional drawing. It is sectional drawing explaining operation | movement of an air valve same as the above. It is sectional drawing which shows the decomposition | disassembly procedure of an air valve same as the above.

  The best mode for carrying out the present invention will be described below with reference to the drawings. 1A is a front view of an air valve 1X according to a first embodiment of the present invention, FIG. 1B is a cross-sectional view (cross-sectional view in front view), and FIGS. 2A and 2B are views of the air valve 1X. 3A and 3B are cross-sectional views illustrating the cover fixing screw 41 and the like, FIGS. 3A and 3B are cross-sectional views illustrating the operation of the air valve 1X, and FIGS. Enlarged partial sectional views for explaining the movement of the float valve body 6 of the air valve 1X, and FIGS. 5A to 5C are sectional views sequentially showing the disassembling procedure of the air valve 1X. This air valve 1X has a vent 2a at the upper end, a water inlet 2b at the lower end, a hollow portion 2c inside the vent 2a, and a water guide 2d below the vent 2b. A valve box 2 connected to the water pipe 100, a lid 3 having a large air hole 3a for exhausting air facing the vent 2a of the valve box 2, The valve body guide 5 disposed in the hollow portion 2c of the box 2, the float valve body 6 disposed inside the valve body guide 5, and the inside of the valve body guide 5 above the float valve body 6 And a floating valve body 7 having a small air hole 7 a facing the large air hole 3 a of the lid 3. Moreover, the lever cover 4 attached to the valve box 2 so that attachment or detachment is possible is further provided. Hereinafter, the structure of these components will be described together with their functions.

  First, the valve box 2 will be described. The valve box 2 has an outer shape similar to a wine glass as a whole. The hollow portion 2c of the valve box 2 has a relatively wide space from the vent 2a at the upper end to the middle in the vertical direction. The water guide portion 2d communicates with the hollow portion 2c, and is a substantially cylindrical pipe having a smaller diameter than the hollow portion 2c.

  The valve box 2 is provided with a lever 22 on its outer surface, which is rotatably provided with an operating portion 22a on one side and an engaging portion 22b that can be pressed against an engaging groove 3b of a lid 3 described later on the other side. Yes. Specifically, two support shafts 21 and 21 are provided on the outer surface of the valve box 2 in the vicinity of the vent hole 2a, and an intermediate portion between the operating portion 22a and the engaging portion 22b of the lever 22 is rotatable. It is supported. Further, on the side wall forming the outer surface of the valve box 2, there is provided a lever opening 2e that allows the engaging portion 22b to rotate and protrude into the hollow portion 2c. Note that the lever opening 2e may have a hollow shape by removing the upper side wall. The engaging portion 22b of the lever 22 has a so-called eccentric cam shape, and the distance from the support shaft 21 to the inner circumferential surface in the horizontal direction is the first position where the operating portion 22a is substantially vertical ( The lever 22 is long) and is short at the second position of the lever 22 (the state in which the lever 22 is raised) where the operating portion 22a is substantially horizontal (the state where the lever 22 is raised), and gradually changes according to the rotation. Yes. The support shaft 21 and the lever 22 are not limited to two and may be three or more.

  Below the lever opening 2e of the valve box 2, the inner side surface of the side wall is bent slightly inward to form a lid receiving portion 2f with which the lower end of an inner lid portion 3B of the lid 3 to be described later contacts. . The lid body receiving portion 2f has an elastic packing ring so that the inner lid portion 3B is fitted from the vent 2a of the valve box 2 and the lower end abuts against the impact, and the adhesion is improved. 23 is fitted.

  Further, the outer surface of the valve box 2 protrudes outward in a bowl shape slightly below the tip of the operation portion 22a when the lever 22 is in the first position (the state in which the lever 22 is tilted), which will be described later. A plurality of (for example, four) lever cover receiving portions 2g, 2g,... With which the lower end surface of the cylindrical lever cover 4 abuts. The tip of the lever cover receiving portion 2g protruding in a bowl shape is preferably formed in a stepped shape with the upper portion removed so that the lever cover 4 can be easily placed at the correct position. Further, on the outer side surface of the valve box 2, a cover fixing portion 2g 'protruding outward to the extent that it abuts against the inner side surface of the lever cover 4 is provided separately from the lever cover receiving portion 2g. The cover fixing portion 2g 'is formed with a screw hole 2h communicating with the hollow portion 2c from the outside (see FIG. 2), and an internal thread is engraved on the inner peripheral surface thereof. The cover fixing portion 2g 'can be shared by one of the lever cover receiving portions 2g.

  In addition, the inner surface near the lower part of the hollow portion 2c partially protrudes inward, and a plurality of (for example, four) valve body guide receivers for receiving the lower end portion of a bottomed cylindrical valve body guide 5 to be described later. These are parts 2i, 2i,.

  A cock 24 is attached to an intermediate part of the water guide part 2d below the hollow part 2c, and the opening and closing of the cock 24 controls the inflow and stoppage of water from the water conduit 100 to the hollow part 2c of the valve box 2. Further, the outside of this portion is covered with a cylindrical cock cover 25 in order to prevent the cock 24 and the valve box 2 from being damaged by the impact load from the side. The valve box 2 has a flange 2j around the water inlet 2b at the lower end, and the flange 2j is joined to the water pipe 100 so that the water inlet 2b communicates with the inside of the water pipe 100.

  Next, the lid 3 will be described. The lid 3 has an outer lid portion 3A shaped like a thin plate, an inner lid portion 3B having a substantially cylindrical shape and having a large air hole 3a in the upper portion, and a certain gap G interposed therebetween. A plurality of (for example, three) column portions 3C to be connected are integrally formed. The lower cylindrical portion 3b extending below the inner lid portion 3B is a hollow portion from the vent 2a of the valve box 2 when the levers 22 and 22 of the valve box 2 are in the second position (the levers 22 and 22 are raised). It fits into 2c, and its lower end comes into contact with the lid receiving portion 2f of the valve box 2. On the outer side surface of the lower cylindrical portion 3b, a concave engaging groove 3c is formed in which the above-described engaging portion 22b of the lever 22 can be pressed. The outer lid portion 3A prevents rainwater or the like from entering the hollow portion 2c of the valve box 2 from the large air hole 3a, and has a larger diameter than the inner lid portion 3B. The air in the hollow portion 2c of the valve box 2 flows out through the large air hole 3a and the gap G.

  When the levers 22 and 22 are rotated from the second position to the first position (the levers 22 and 22 are tilted) with the inner lid portion 3B fitted, the engaging portions 22b and 22b are used for the lever. The engagement groove 3c is pressed from both sides after passing through the openings 2e and 2e, so that the lid 3 is firmly coupled and mounted on the valve box 2 so as not to come off due to the internal pressure of water or air. Therefore, the engagement groove 3c is formed in an annular shape with a concave curve that is gentle in the vertical direction so that the pressure contact from both the engagement portions 22b and 22b is possible. When the levers 22 and 22 are rotated again to the second position (the state where the levers 22 and 22 are raised), the engaging portions 22b and 22b are separated from the engaging grooves 3c to release the pressure contact state, and the lid The body 3 and the valve box 2 can be separated. Note that elastic double O-rings 31 and 32 are fitted around the large air hole 3a of the inner lid portion 3B so that the floating valve body 7 and the valve body guide 5 are in good contact with each other. Yes.

  The cylindrical lever cover 4 is positioned at a position corresponding to the screw hole 2h of the cover fixing portion 2g ′ when the lower end of the cylindrical lever cover 4 is brought into contact with the lever cover receiving portions 2g, 2g,. A cover fixing hole 4a is formed (see FIG. 2). Further, the lever cover 4 has a height and an inner diameter such that the levers 22 and 22 in the first position can be almost completely accommodated with the lower end thereof being in contact with the lever cover receiving portions 2g, 2g,. Have. As shown in FIG. 2A, an attached cover fixing screw 41 connected to the lever cover 4 or the valve box 2 by a wire, a chain, or the like is provided. The lever cover 4 is detachably attached to the valve box 2 by the screw 41. When the lever cover 4 is attached to the valve box 2, the screw 41 is passed through the cover fixing hole 4a of the lever cover 4 and screwed into the screw hole 2h of the valve box 2, as shown in FIG. The screw 41 is preferably a butterfly bolt or a bolt with a handle as shown in the figure, which can be screwed even without a tool. Further, it is desirable that the hollow portion 2c side of the screw hole 2h is narrowed so that the tip of the screw 41 protrudes slightly inward so that dust or the like is difficult to adhere.

  The lever cover 4 prevents the levers 22 and 22 from being accidentally set to the second position due to an unexpected external force when the air valve 1X is installed not in a manhole or the like. Can also improve aesthetics. Further, the screw 41 and the screw hole 2h of the valve box 2 have an excellent effect when the air valve 1X is disassembled, which will be described later.

  The bottomed cylindrical valve body guide 5 has window holes 5a and 5b through which air and water can be circulated at appropriate positions on the upper side and the bottom of the side. The window hole 5 a on the upper side may be a notch from the upper end of the valve element guide 5. The valve body guide 5 has its upper end abutted against the O-ring 32 of the lid 3 and the lower end portion of the valve body guide 5 abutted against the valve body guide receiving portion 2 i of the valve box 2, thereby fixing the position.

  The float valve body 6 is lighter in specific gravity than water. The float valve body 6 has a long and substantially cylindrical shape, and an upper end portion 6a thereof is tapered in a truncated cone shape. The tip has a curved surface in consideration of adhesion when the air valve 1X is installed inclined from the vertical direction, difficulty in fixing to the valve seat 71, and the like. In this way, the curved surface at the tip can be freely designed, which is different from the float valve body 106 of the air valve 101 of FIG. 11 described in the background art section.

  The floating valve body 7 is generally disc-shaped, and an inverted truncated cone-shaped recess 7 b corresponding to the truncated cone-shaped upper end 6 a of the float valve body 6 is formed on the lower surface. At its center, it protrudes slightly downward so that it can be in close contact with the float valve body 6 and has a flat surface with a resilient valve seat 71, and a small air hole 7 a at the center of the valve seat 71. It is formed so as to penetrate vertically. Further, a small hole 7c for passing air is formed between the outer peripheral surface of the idle valve element 7 and the recess 7b. The idle valve element 7 is lighter than the float valve element 6. When the float valve body 6 is separated from the idle valve body 7, the air in the hollow portion 2c of the valve box 2 is discharged from the small air hole 7a. When the float valve body 6 is in contact with the floating valve body 7, the upper end portion 6a of the float valve body 6 is fitted into the recess 7b, thereby closing the small air hole 7a. The floating valve body 7 has a convex portion 7d formed on the upper surface thereof. The convex portion 7d is smaller than the large air hole 3a of the lid body 3, and when the floating valve body 7 rises, the convex portion 7d is loosely fitted into the large air hole 3a, and the peripheral portion of the convex portion 7d is the lid body. 3 0-rings 31 with good adhesion.

  The air valve 1X operates as follows. That is, when the cock 24 is opened and water enters the hollow portion 2c of the valve box 2 from the water conduit 100, the air in the hollow portion 2c of the valve box 2 is rapidly exhausted from the large air hole 3a by the water pressure. The At the same time, the floating valve body 7 and the float valve body 6 rise as the water level rises. As a result, as shown in FIG. 3 (a), the floating valve body 7 comes into close contact with the upper surface of the inner lid portion 3B to close the large air hole 3a, and the float valve body 6 comes into close contact with the floating valve body 7 so In order to close the air hole 7a, the hollow portion 2c of the valve box 2 has an air reservoir A and a water reservoir W up and down, and is completely sealed. After such a sealed state, when air enters the hollow portion 2c of the valve box 2 through the water pipe 100 and enters the hollow portion 2c of the valve box 2, the pressure of the air reservoir A in the hollow portion 2c of the valve box 2 increases, and the water is retreated. The water level goes down. The float valve body 6 descends as the water level falls, while the floating valve body 7 remains pushed up by the internal pressure of the air reservoir A. Then, as shown in FIG. 3B, the float valve body 6 is separated downward from the floating valve body 7, and the air is discharged to the outside of the valve box 2 through the small air hole 7a and the large air hole 3a. . And again, the water level rises and the hollow portion 2c of the valve box 2 is completely sealed.

  Here, the normal valve such as the air valve 101 of FIG. 11 described in the background art section is generally difficult to operate normally when tilted by 2 degrees or more from the vertical direction, and is installed within that range. When the float valve body 6 of the air valve 1X according to the embodiment of the present invention is installed in the vertical direction, the float valve body 6 is in close contact with the surface of the valve seat 71 of the floating valve body 7 as shown in FIG. As shown in FIG. 4 (b), the float valve element 6 is long in the case where it is installed from the vertical direction. Therefore, the water level is usually in contact with the inner side surface of the upper side wall while the cylindrical side surface is in contact with it. The tip of the floating valve body 7 comes into close contact with the surface of the valve seat 71 of the floating valve body 7. The relative positional relationship between the float valve element 6 and the valve seat 71 in FIG. 4B is such that the float valve element 6 in FIG. 4A is in the radial direction, and the gap g between the float valve element 6 and the inner side surface of the side wall. Only translated. Accordingly, the inverted frustoconical recess 7b of the floating valve body 7 is sized so as not to hinder its parallel movement. Further, the tip of the upper end portion 6a of the float valve body 6 is in close contact with the valve seat 71 in a direction close to a flat surface. In the experiment by the present inventor, a curved surface with a radius of curvature up to 1 to 3 times the height (height) L of the float valve body 6 is desirable, and the air valve 1X operates without problems even when tilted 30 degrees from the vertical direction. Has been confirmed. Therefore, it is possible to install the air valve 1X at a place where maintenance work can be performed easily and quickly, whether it is up or down.

  Next, a procedure for maintenance work of the air valve 1X will be described. First, the manhole cover or the like is removed as necessary so that the air valve 1X appears. At this time, if the water overflows, there is a possibility that the small air hole 7a remains open without being blocked by the float valve body 6 due to the attachment of dust or the like and leaks. Next, the cock 24 is closed to block communication between the water pipe 100 and the hollow portion 2c of the valve box 2 so that water does not flow in during operation.

  Next, the screw 41 of the cover fixing screw 41 is loosened and removed. At this time, normally, water is ejected from the screw hole 2h of the valve box 2, but the normal operation of the air valve 1X can be confirmed by the water pressure. Temporarily, the floating valve body 7 and the float valve body 6 were fixed, and even when the water level dropped, the float valve body 6 did not descend and the small air holes 7a remained blocked and air was not discharged. In some cases, air will erupt. In this way, even if the air valve 1X is not disassembled, it can be determined by observation from the outside whether or not the air valve 1X is operating normally. If the air valve 1X does not operate normally, the air valve 1X will be disassembled. At that time, the internal pressure due to the accumulated compressed air can be reduced and the disassembly work such as removal of the lid 3 can be started. It becomes possible to work quickly while avoiding the possibility of the lid 3 being blown off by an abnormal internal pressure at the moment when the positions 22 and 22 are set to the second position. Also in the air valve 101 of FIG. 11 described in the background art section, if the screw hole communicating with the hollow portion 102c from the outside is formed and the screw is screwed, the air valve 101 need not be disassembled. By loosening the screw and observing whether water is ejected or air is ejected, it is possible to determine whether the floating valve body 107 and the float valve body 106 are firmly attached to each other.

  Next, as shown in FIG. 5A, the lever cover 4 is removed and the lid 3 is removed. As shown in FIG. 5B, the levers 22 and 22 are moved to the second position, and the pressure contact state between the lid 3 and the levers 22 and 22 is released. And as shown in FIG.5 (c), the cover body 3 is pulled up and removed. Here, the outer lid portion 3A and the inner lid portion 3B are integrated, and the outer lid body 103A, the upper inner lid body 103Ba, and the lower inner lid body 103Bb of the air valve 101 in FIG. 11 described in the background art section. Therefore, the lid 3 can be easily and quickly removed from the valve box 2.

  When the inspection, cleaning, or repair work is completed, the valve body guide 5, the float valve body 6, and the floating valve body 7 are returned to the hollow portion 2c of the valve box 2, the lid body 3 is fitted, and the levers 22 and 22 are moved to the first position. At the position, the lid 3 and the levers 22 and 22 are attached in pressure contact. Then, the lever cover 4 is installed, and the screw 41 is screwed into the screw hole 2 h of the valve box 2. If necessary, replace the manhole cover, etc. Thus, the air valve 1X can be easily and quickly assembled.

  That is, in the air valve 1X, the lid 3 is fixed and released by rotating the levers 22 and 22 of the valve box 2, so that the assembly including the maintenance work can be easily and quickly performed without using a tool. And disassembly work becomes possible.

  Next, an air valve 1Y according to a second embodiment of the present invention will be described. Like the air valve 1X, the air valve 1Y includes a valve box 2, a lid 3, a valve body guide 5, a float valve body 6, a floating valve body 7, and a lever cover 4, and a portion of the air valve 1X. There are many parts corresponding to. In the following description, parts corresponding to the parts of the air valve 1X are denoted by the same reference numerals. 6A is a front view of the air valve 1Y, and FIG. 6B is a cross-sectional view (cross-sectional view in front view). 7A and 7B are cross-sectional views illustrating a cover fixing screw 41 and the like of the air valve 1Y. FIG. 7A is a view immediately after the lid 3 is fitted into the valve box 2. FIG. The state, (b), shows the state where the lid body 3 is then rotated and the lever cover 4 is mounted. 8A and 8B are plan views for explaining the mounting operation of the lid 3 of the air valve 1Y. FIGS. 9A to 9C are cross-sectional views sequentially showing the disassembling procedure of the air valve 1Y. In the cross-sectional views other than FIG. 9C, the cross-section background portion of the valve element guide 5 is omitted. The air valve 1Y is of a type that does not have a cock 24, and is normally used by connecting a separate repair valve 100 'having a cock 24 between the air valve 1Y and the water pipe 100. It is. Hereinafter, the structure of the components of the air valve 1Y will be described together with the functions thereof. In addition, since those skilled in the art can easily understand the same parts as those of the air valve 1X, description thereof is omitted.

  The valve box 2 of the air valve 1Y does not have the cock 24 in the water guide portion 2d, and communicates with the water guide portion 100d of the repair valve 100 'through the water inlet 2b at the end of the short water guide portion 2d. The hollow portion 2c of the valve box 2 has a space from the vent 2a at the upper end to the vicinity of the lower end because the water guiding portion 2d is short. Insertion grooves 2k and 2k for inserting later-described two insertion portions 3D and 3D of the lid 3 are formed in the circumferential direction on the inner side surface near the vent 2a (see FIG. 9C). . The lid mounting portion at the entrance of the insertion grooves 2k, 2k is a downward slope so that the lid 3 cannot be pressed by the levers 22, 22 while the insertion sections 3D, 3D are not securely inserted into the insertion grooves 2k, 2k. Portion 2ka and 2ka (see FIG. 9C). On the upper part of the side wall of the valve box 2, a cover mounting male screw 2m for attaching the lever cover 4 by hand tightening with a nut is provided. Below the lid body receiving portion 2f, the inner surface of the side wall is bent slightly inward, and a valve body guide support portion 2n that contacts and supports the flange portion of the valve body guide 5 is formed. Although the water guide part 2d is a little smaller than the hollow part 2c, it is a short, substantially cylindrical pipe having a relatively large diameter. In the figure, the diameter of the water guide portion 2d is different between the front view and the side view. The cover fixing portion 2g 'in which the screw hole 2h is formed is larger than that of the air valve 1X in FIG. 7, but the basic structure is the same. The cover fixing portion 2g 'may not necessarily protrude outward as long as the outer surface of the valve box 2 and the inner surface of the lever cover 4 are in contact with each other. Therefore, the valve box 2 does not have the lever cover receiving portion 2g, the valve body guide receiving portion 2i, the cock 24, and the cock cover 25 in the air valve 1X. In the valve box 2 of the air valve 1Y, the description other than the above is the same as that of the air valve 1X.

  The lid body 3 of the air valve 1Y is formed by integrally forming an inner lid portion 3B and two insertion portions 3D and 3D provided on the periphery of the upper surface of the inner lid portion 3B. Therefore, the lid 3 does not have the outer lid portion 3A and the column portion 3C in the air valve 1X. The insertion portion 3D is formed with a step so that the end portion 3Da is thin, and the end portion 3Da protrudes outward from the outer surface of the inner lid portion 3B (see FIG. 7A). As shown in FIG. 8 (a), the lid 3 is mounted by placing the two insertion portions 3D and 3D on the lid mounting portion at the inlet of the insertion grooves 2k and 2k of the valve box 2, The inner lid 3B is fitted. And as shown in the figure (b), it rotates clockwise and the two insertion parts 3D and 3D are inserted in the insertion grooves 2k and 2k, and then the levers 22 and 22 are rotated. This is because, in the unlikely event that the cover fixing screw 41 is screwed into the screw hole 2h without mounting the lever cover 4 by mistake, the cover 3 and the levers 22 and 22 can be removed during maintenance work. This is to avoid the possibility that the lid 3 will blow off when the pressure contact state is released. The lid 3 of the air valve 1Y is not provided with the O-rings 31 and 32 in the air valve 1X. In the lid 3 of the air valve 1Y, the description of the air valve 1Y other than the above is the same as that of the air valve 1X.

  The lever cover 4 of the air valve 1Y has a cylindrical shape having a top portion. The top portion 4b of the lever cover 4 functions in place of the outer lid portion 3A of the air valve 1X, and the cover mounting male screw 2m of the valve box 2 is inserted therethrough when the lever cover 4 is mounted. A hole is formed. The lever cover 4 has a height and an inner diameter so that most of the levers 22 and 22 in the first position can be accommodated. In FIG. 7, the screw 41 for fixing the cover is in the shape of a bolt with a handle and is larger than that of the air valve 1X, but the basic structure is the same. Further, in FIG. 7, the screw 41 is not connected to the lever cover 4 or the like by a wire or a chain, but can be connected. In the lever cover 4 of the air valve 1Y, the description other than the above is the same as that of the air valve 1X.

  A disc-shaped rectifying plate 5A having a rectifying hole 5Aa in the center is attached to the bottom of the valve body guide 5 of the air valve 1Y. In the rectifying plate 5A, the diameter of the rectifying hole 5Aa is smaller than the diameter of the water guiding portion 2d, and the main body 5Ab around the rectifying hole 5Aa is superposed on the position of the window hole 5b at the bottom of the valve element guide 5. . Therefore, the rectifying plate 5A allows air (in the case of a large amount of exhaust) or water (in the case of exhaust under pressure) from the water guide 2d to flow into the window hole 5b at the same flow rate regardless of the diameter of the water guide 2d. Therefore, the flow of air or water can be adjusted so as not to disturb the normal operation of the float valve body 6. In addition, the window hole 5a on the upper side of the valve element guide 5 of the air valve 1Y is notched from the upper end (see FIG. 9C). In the valve element guide 5 of the air valve 1Y, the description other than the above is the same as that of the air valve 1X.

  The float valve body 6 of the air valve 1Y is the same as that of the air valve 1X.

  The floating valve body 7 of the air valve 1Y is provided with an O-ring 72 instead of the O-ring 31 provided on the lid 3 in the air valve 1X. In the floating valve body 7 of the air valve 1Y, the description other than the above is the same as that of the air valve 1X.

  The operation of the air valve 1Y is the same as the operation of the air valve 1X described above. The maintenance procedure for the air valve 1Y is as follows: when the lever cover 4 is attached / detached, the nut is manually screwed in and out of the cover mounting male screw 2m, and when the cover 3 is attached / detached, Except for the operation of inserting the insertion portions 3D and 3D into the insertion grooves 2k and 2k, as shown in FIGS. 9A to 9C, it is the same as the case of the air valve 1X and can be easily performed without using a tool. Assembly and disassembly work including maintenance work can be performed quickly. In addition, the cover body 3 is rotating between FIG.9 (b) and the same figure (c).

  The air valve 1Y can be used as a temporary fire hydrant. FIG. 10 shows the lever cover 4, the lid 3, the valve body guide 5, the float valve body 6, and the floating valve body 7, and the insertion type (machino type) base 8 is inserted into the hollow portion 2 c of the valve box 2. It is sectional drawing which shows the state which set 22 and 22 to the 1st position. An engagement groove 3c ′ similar to the concave engagement groove 3c of the lid 3 is formed in the base 8. The engagement portions 22b and 22b of the levers 22 and 22 of the valve box 2 are engaged with the engagement groove 3c ′. The base 8 is firmly joined to the valve box 2. In this state, the fire hose can be connected to extinguish the fire. Since the water guide portion 2d has a relatively large diameter, a large amount of water can be supplied. When the base 8 is removed, the levers 22 and 22 are set to the second position. In addition, an angle valve can be attached in the state shown in FIG. 10 and used for water supply in the event of a disaster. Furthermore, the state shown in FIG. 10 may be used in order to conduct an investigation by introducing an in-pipe investigation camera or a pressure gauge into the water pipe 100.

  As mentioned above, although the air valve which concerns on embodiment of this invention was demonstrated, this invention is not restricted to what was described in embodiment, Various design change within the range of the matter described in the claim is carried out. Is possible. For example, such an air valve can be integrally attached to a normal fire hydrant. Of course, the shapes and structures of the valve box, the lid, the valve body guide, the float valve body, the floating valve body and the like described in the embodiments can be modified as appropriate. It is also possible to easily make the air valve 1X a type without the cock 24 or make the air valve 1Y a type with the cock 24.

1X, 1Y Air valve 2 Valve box 2a Valve box vent 2b Valve box water inlet 2c Valve box hollow part 2d Valve box water guide part 2g 'Cover fixing part 2h Valve box screw hole 22 Lever 22a Lever operation part 22b Lever engaging portion 3 Lid 3B Lid inner lid 3a Lid large air hole 3b Lid lower cylinder 3c Lid engaging groove 4 Lever cover 41 Screw 5 Valve guide 5A Current plate 5Aa Rectification hole 6 Float valve body 7 Floating valve body 7a Small air hole of the floating valve body

  The present invention relates to an air valve that discharges air accumulated inside a water pipe to the outside of the pipe.

  In general, water pipes such as water pipes and agricultural water pipes are designed so that air (including other gases mixed in the air in this specification) accumulates therein and does not hinder water flow. Is provided with an air valve for discharging air out of the pipe. FIG. 11 shows a conventional general air valve, which is the same as the conventional air valve described in Patent Document 1 invented by the present inventor. 11A is a front view, and FIG. 11B is a cross-sectional view. This air valve 101 has a vent 102a at the upper end, a water passage 102b at the lower end, a hollow portion 102c inside the lower portion of the vent 102a, and a water guide portion 102d below the vent 102b. A valve box 102 connected to the water pipe 100, a lid 103 having a large air hole 103a for exhausting air facing the vent 102a of the valve box 102, and a valve body 102, A valve body guide 105 disposed in the hollow portion 102c of the box 102; a spherical float valve body 106 disposed inward of the valve body guide 105; And a floating valve body 107 having a small air hole 107 a facing the large air hole 103 a of the lid body 103. More specifically, the valve box 102 has a cock 124 at an intermediate portion of the water guide portion 102d. The lid 103 includes a separate outer lid 103A, an upper inner lid 103Ba, and a lower inner lid 103Bb, and lid fixing bolts 141, 141,... And nuts 142, 142,. It is fixed to the valve box 102 by Further, the valve body guide 105 has window holes through which air and water can be circulated at appropriate positions on the upper side and the bottom of the side part. The floating valve body 107 has a valve seat 171 that protrudes slightly downward at the center, and a small air hole 107a is formed in the valve seat 171. Patent Document 1 proposes obtaining an effect such as downsizing by devising a spherical float valve element 106 as a columnar float valve element.

  The operation of the air valve 101 is as follows. That is, when the cock 124 attached to the valve box 102 is opened, the air in the water conduit 100 and the valve box 102 is rapidly exhausted (large amount of exhaust) from the large air hole 103a due to the water pressure. When water enters the hollow portion 102c of the valve box 102 from the water conduit 100, the floating valve body 107 and the float valve body 106 rise as the water level rises. As a result, as shown in FIG. 12A, the floating valve body 107 is in close contact with the lower inner lid body 103Bb to close the large air hole 103a, and the float valve body 106 is in close contact with the floating valve body 107 to In order to close the small air hole 107a, the hollow portion 102c of the valve box 102 has an air reservoir A and a water reservoir W up and down, and is completely sealed. After such a sealed state, when air enters the hollow portion 102c of the valve box 102 through the water pipe 100 and enters the hollow portion 102c, the pressure of the air pool A in the hollow portion 102c of the valve box 102 increases, and the water is retreated. The water level goes down. The float valve body 106 descends as the water level falls, while the floating valve body 107 remains pushed up by the internal pressure of the air reservoir A. Then, as shown in FIG. 12 (b), the float valve body 106 is separated downward from the floating valve body 107, and the air is discharged to the outside of the valve box 102 through the small air hole 107a and the large air hole 103a ( Exhausted under pressure). Then, the water level rises again, and the hollow portion 102c of the valve box 102 is completely sealed as shown in FIG.

  In such an air valve 101, due to adhesion of dust or the like, the small air hole 107 a remains open without being blocked by the float valve body 106, and water leaks, or conversely, the floating valve body 107 and the float valve body 106. Even if the water level drops, the float valve element 106 does not descend and the small air hole 107a remains blocked, and air may not be discharged. For this reason, maintenance work is performed urgently or when a failure occurs, and at that time, the air valve 101 is disassembled.

JP 2005-61618 A

  However, since the outer lid body 104 is fixed to the valve box 102 using a plurality of lid body fixing bolts 141, 141,..., Each time, using a tool, as shown in FIG. Valve 101 must be disassembled. That is, as shown in FIG. 13A, the nuts 142, 142,... Are removed from the lid fixing bolts 141, 141,. , The lid fixing bolts 141, 141,... Are loosened and removed, and the upper inner lid body 103Ba and the lower inner lid body 103Bb are removed. And as shown in FIG.13 (c), the valve body guide 105, the float valve body 106, and the floating valve body 107 are taken out from the hollow part 102c of the valve box 102. FIG. Thereafter, when the inspection, cleaning, or repair work is completed, the valve body guide 105, the float valve body 106, and the floating valve body 107 are returned to the hollow portion 102c of the valve box 102, and the lower inner lid body 103Bb and the upper inner lid body are returned. 103Ba and the outer lid 103A are attached to the valve box 102 and fixed with lid fixing bolts 141, 141,. As described above, disassembling the air valve 101 in maintenance work is very complicated.

  On the other hand, the air valve 101 is installed in a manhole or a water pipe bridge on the road. However, since the traffic is temporarily stopped in the work in the manhole, the maintenance work needs to be performed quickly although it is complicated as described above. There is.

  The present invention has been made in view of the above reasons, and an object of the present invention is to provide an air valve capable of more easily and quickly performing assembly and disassembly work including maintenance work.

In order to achieve the above object, the air valve according to claim 1 has a vent at the upper end, a water vent at the lower end, a hollow portion inside the vent, and a water guide below the vent. A valve body having a large air hole facing the vent of the valve box and attached to the valve box, a valve body guide disposed in a hollow portion of the valve box, A floating valve body disposed in the direction of the valve body, and a floating valve body that is disposed inward of the valve body guide and above the float valve body, and has a small air hole facing the large air hole of the lid body, In the air valve comprising: the lid body is formed by extending a lower cylindrical portion that fits into a hollow portion of the valve box, and forming a concave engagement groove on an outer surface of the lower cylindrical portion. Is provided with a lever having an operating portion on one side and an engaging portion that can be pressed against the engaging groove of the lid on the other side of the outer surface. Serial lever state, and are not engaging portion in the first position is pressed against the engagement groove of the lid, engaging portion at the second position away from the engaging groove of the lid, the valve A lever cover that is detachably attached to the box, houses the lever in the first position, and is lifted and removed when the lid is pulled up and removed; It is characterized by.

The air valve according to claim 2 is the air valve according to claim 1, wherein when the lever is in the first position, the lever is accidentally moved to the second position by an unexpected external force. It is characterized by preventing becoming .

The air valve according to claim 3 is the air valve according to claim 1 or 2, wherein the valve box blows out air when air is not discharged normally from the small air hole and is not operating normally. In addition, when the air can be discharged from the small air hole and is operating normally, a hole capable of communicating the hollow portion with the outside is formed so as to eject water .

The air valve according to claim 4 is the air valve according to any one of claims 1 to 3, wherein the lever cover has a cover fixing hole, and a screw is inserted into the hole of the valve box. The lever cover is attached to the valve box by being screwed through .

The air valve according to claim 5 is the air valve according to any one of claims 1 to 4, which is performed by putting an in-pipe inspection camera or a pressure gauge into the fire extinguishing, water supply, or water pipe. When used for investigation, the lid, the valve body guide, the float valve body, and the floating valve body are removed, and a plug-in base is inserted into the hollow portion so that the lever is in the first position. Thus, the base can be coupled to the valve box .

The air valve according to claim 6 is the air valve according to any one of claims 1 to 4 , wherein the valve box includes a plug-in base to which a fire hose or an angle valve can be connected is inserted into the hollow portion. Then, the base can be coupled by setting the lever to the first position .

The air valve according to claim 7 is the air valve according to any one of claims 1 to 6, wherein the valve body guide has a bottomed cylindrical shape, and air is located at the side upper side and the bottom side. The hollow portion is formed with a plurality of valve body guide receiving portions in which the inner surface in the vicinity of the lower portion partially protrudes inward. The lower end part of the said valve body guide contact | abuts to a part, It is characterized by the above-mentioned.

  According to the air valve of the present invention, the lid is fixed and released by rotating the lever of the valve box without using a tool, or the hollow portion is communicated with the outside before the lid is removed. Therefore, assembly and disassembly work including maintenance work can be easily and quickly performed.

It is (a) front view and (b) sectional view of an air valve concerning a 1st embodiment of the present invention. It is sectional drawing explaining the screw etc. for fixing the cover of an air valve same as the above. It is sectional drawing explaining operation | movement of an air valve same as the above. It is an expanded fragmentary sectional view explaining a motion of the float valve body of an air valve same as the above. It is sectional drawing which shows the decomposition | disassembly procedure of an air valve same as the above. It is (a) front view of the air valve which concerns on the 2nd Embodiment of this invention, (b) It is sectional drawing. It is sectional drawing explaining the screw etc. for fixing the cover of an air valve same as the above. It is a top view explaining mounting | wearing operation | movement of the cover body of an air valve same as the above. It is sectional drawing which shows the decomposition | disassembly procedure of an air valve same as the above. It is sectional drawing explaining the case where an air valve same as the above is used as a temporary fire hydrant. It is the (a) front view of the conventional air valve, (b) It is sectional drawing. It is sectional drawing explaining operation | movement of an air valve same as the above. It is sectional drawing which shows the decomposition | disassembly procedure of an air valve same as the above.

  The best mode for carrying out the present invention will be described below with reference to the drawings. 1A is a front view of an air valve 1X according to a first embodiment of the present invention, FIG. 1B is a cross-sectional view (cross-sectional view in front view), and FIGS. 2A and 2B are views of the air valve 1X. 3A and 3B are cross-sectional views illustrating the cover fixing screw 41 and the like, FIGS. 3A and 3B are cross-sectional views illustrating the operation of the air valve 1X, and FIGS. Enlarged partial sectional views for explaining the movement of the float valve body 6 of the air valve 1X, and FIGS. 5A to 5C are sectional views sequentially showing the disassembling procedure of the air valve 1X. This air valve 1X has a vent 2a at the upper end, a water inlet 2b at the lower end, a hollow portion 2c inside the vent 2a, and a water guide 2d below the vent 2b. A valve box 2 connected to the water pipe 100, a lid 3 having a large air hole 3a for exhausting air facing the vent 2a of the valve box 2, The valve body guide 5 disposed in the hollow portion 2c of the box 2, the float valve body 6 disposed inside the valve body guide 5, and the inside of the valve body guide 5 above the float valve body 6 And a floating valve body 7 having a small air hole 7 a facing the large air hole 3 a of the lid 3. Moreover, the lever cover 4 attached to the valve box 2 so that attachment or detachment is possible is further provided. Hereinafter, the structure of these components will be described together with their functions.

  First, the valve box 2 will be described. The valve box 2 has an outer shape similar to a wine glass as a whole. The hollow portion 2c of the valve box 2 has a relatively wide space from the vent 2a at the upper end to the middle in the vertical direction. The water guide portion 2d communicates with the hollow portion 2c, and is a substantially cylindrical pipe having a smaller diameter than the hollow portion 2c.

  The valve box 2 is provided with a lever 22 on its outer surface, which is rotatably provided with an operating portion 22a on one side and an engaging portion 22b that can be pressed against an engaging groove 3b of a lid 3 described later on the other side. Yes. Specifically, two support shafts 21 and 21 are provided on the outer surface of the valve box 2 in the vicinity of the vent hole 2a, and an intermediate portion between the operating portion 22a and the engaging portion 22b of the lever 22 is rotatable. It is supported. Further, on the side wall forming the outer surface of the valve box 2, there is provided a lever opening 2e that allows the engaging portion 22b to rotate and protrude into the hollow portion 2c. Note that the lever opening 2e may have a hollow shape by removing the upper side wall. The engaging portion 22b of the lever 22 has a so-called eccentric cam shape, and the distance from the support shaft 21 to the inner circumferential surface in the horizontal direction is the first position where the operating portion 22a is substantially vertical ( The lever 22 is long) and is short at the second position of the lever 22 (the state in which the lever 22 is raised) where the operating portion 22a is substantially horizontal (the state where the lever 22 is raised), and gradually changes according to the rotation. Yes. The support shaft 21 and the lever 22 are not limited to two and may be three or more.

  Below the lever opening 2e of the valve box 2, the inner side surface of the side wall is bent slightly inward to form a lid receiving portion 2f with which the lower end of an inner lid portion 3B of the lid 3 to be described later contacts. . The lid body receiving portion 2f has an elastic packing ring so that the inner lid portion 3B is fitted from the vent 2a of the valve box 2 and the lower end abuts against the impact, and the adhesion is improved. 23 is fitted.

  Further, the outer surface of the valve box 2 protrudes outward in a bowl shape slightly below the tip of the operation portion 22a when the lever 22 is in the first position (the state in which the lever 22 is tilted), which will be described later. A plurality of (for example, four) lever cover receiving portions 2g, 2g,... With which the lower end surface of the cylindrical lever cover 4 abuts. The tip of the lever cover receiving portion 2g protruding in a bowl shape is preferably formed in a stepped shape with the upper portion removed so that the lever cover 4 can be easily placed at the correct position. Further, on the outer side surface of the valve box 2, a cover fixing portion 2g 'protruding outward to the extent that it abuts against the inner side surface of the lever cover 4 is provided separately from the lever cover receiving portion 2g. The cover fixing portion 2g 'is formed with a screw hole 2h communicating with the hollow portion 2c from the outside (see FIG. 2), and an internal thread is engraved on the inner peripheral surface thereof. The cover fixing portion 2g 'can be shared by one of the lever cover receiving portions 2g.

  In addition, the inner surface near the lower part of the hollow portion 2c partially protrudes inward, and a plurality of (for example, four) valve body guide receivers for receiving the lower end portion of a bottomed cylindrical valve body guide 5 to be described later. These are parts 2i, 2i,.

  A cock 24 is attached to an intermediate part of the water guide part 2d below the hollow part 2c, and the opening and closing of the cock 24 controls the inflow and stoppage of water from the water conduit 100 to the hollow part 2c of the valve box 2. Further, the outside of this portion is covered with a cylindrical cock cover 25 in order to prevent the cock 24 and the valve box 2 from being damaged by the impact load from the side. The valve box 2 has a flange 2j around the water inlet 2b at the lower end, and the flange 2j is joined to the water pipe 100 so that the water inlet 2b communicates with the inside of the water pipe 100.

  Next, the lid 3 will be described. The lid 3 has an outer lid portion 3A shaped like a thin plate, an inner lid portion 3B having a substantially cylindrical shape and having a large air hole 3a in the upper portion, and a certain gap G interposed therebetween. A plurality of (for example, three) column portions 3C to be connected are integrally formed. The lower cylindrical portion 3b extending below the inner lid portion 3B is a hollow portion from the vent 2a of the valve box 2 when the levers 22 and 22 of the valve box 2 are in the second position (the levers 22 and 22 are raised). It fits into 2c, and its lower end comes into contact with the lid receiving portion 2f of the valve box 2. On the outer side surface of the lower cylindrical portion 3b, a concave engaging groove 3c is formed in which the above-described engaging portion 22b of the lever 22 can be pressed. The outer lid portion 3A prevents rainwater or the like from entering the hollow portion 2c of the valve box 2 from the large air hole 3a, and has a larger diameter than the inner lid portion 3B. The air in the hollow portion 2c of the valve box 2 flows out through the large air hole 3a and the gap G.

  When the levers 22 and 22 are rotated from the second position to the first position (the levers 22 and 22 are tilted) with the inner lid portion 3B fitted, the engaging portions 22b and 22b are used for the lever. The engagement groove 3c is pressed from both sides after passing through the openings 2e and 2e, so that the lid 3 is firmly coupled and mounted on the valve box 2 so as not to come off due to the internal pressure of water or air. Therefore, the engagement groove 3c is formed in an annular shape with a concave curve that is gentle in the vertical direction so that the pressure contact from both the engagement portions 22b and 22b is possible. When the levers 22 and 22 are rotated again to the second position (the state where the levers 22 and 22 are raised), the engaging portions 22b and 22b are separated from the engaging grooves 3c to release the pressure contact state, and the lid The body 3 and the valve box 2 can be separated. Note that elastic double O-rings 31 and 32 are fitted around the large air hole 3a of the inner lid portion 3B so that the floating valve body 7 and the valve body guide 5 are in good contact with each other. Yes.

  The cylindrical lever cover 4 is positioned at a position corresponding to the screw hole 2h of the cover fixing portion 2g ′ when the lower end of the cylindrical lever cover 4 is brought into contact with the lever cover receiving portions 2g, 2g,. A cover fixing hole 4a is formed (see FIG. 2). Further, the lever cover 4 has a height and an inner diameter such that the levers 22 and 22 in the first position can be almost completely accommodated with the lower end thereof being in contact with the lever cover receiving portions 2g, 2g,. Have. As shown in FIG. 2A, an attached cover fixing screw 41 connected to the lever cover 4 or the valve box 2 by a wire, a chain, or the like is provided. The lever cover 4 is detachably attached to the valve box 2 by the screw 41. When the lever cover 4 is attached to the valve box 2, the screw 41 is passed through the cover fixing hole 4a of the lever cover 4 and screwed into the screw hole 2h of the valve box 2, as shown in FIG. The screw 41 is preferably a butterfly bolt or a bolt with a handle as shown in the figure, which can be screwed even without a tool. Further, it is desirable that the hollow portion 2c side of the screw hole 2h is narrowed so that the tip of the screw 41 protrudes slightly inward so that dust or the like is difficult to adhere.

  The lever cover 4 prevents the levers 22 and 22 from being accidentally set to the second position due to an unexpected external force when the air valve 1X is installed not in a manhole or the like. Can also improve aesthetics. Further, the screw 41 and the screw hole 2h of the valve box 2 have an excellent effect when the air valve 1X is disassembled, which will be described later.

  The bottomed cylindrical valve body guide 5 has window holes 5a and 5b through which air and water can be circulated at appropriate positions on the upper side and the bottom of the side. The window hole 5 a on the upper side may be a notch from the upper end of the valve element guide 5. The valve body guide 5 has its upper end abutted against the O-ring 32 of the lid 3 and the lower end portion of the valve body guide 5 abutted against the valve body guide receiving portion 2 i of the valve box 2, thereby fixing the position.

  The float valve body 6 is lighter in specific gravity than water. The float valve body 6 has a long and substantially cylindrical shape, and an upper end portion 6a thereof is tapered in a truncated cone shape. The tip has a curved surface in consideration of adhesion when the air valve 1X is installed inclined from the vertical direction, difficulty in fixing to the valve seat 71, and the like. In this way, the curved surface at the tip can be freely designed, which is different from the float valve body 106 of the air valve 101 of FIG. 11 described in the background art section.

  The floating valve body 7 is generally disc-shaped, and an inverted truncated cone-shaped recess 7 b corresponding to the truncated cone-shaped upper end 6 a of the float valve body 6 is formed on the lower surface. At its center, it protrudes slightly downward so that it can be in close contact with the float valve body 6 and has a flat surface with a resilient valve seat 71, and a small air hole 7 a at the center of the valve seat 71. It is formed so as to penetrate vertically. Further, a small hole 7c for passing air is formed between the outer peripheral surface of the idle valve element 7 and the recess 7b. The idle valve element 7 is lighter than the float valve element 6. When the float valve body 6 is separated from the idle valve body 7, the air in the hollow portion 2c of the valve box 2 is discharged from the small air hole 7a. When the float valve body 6 is in contact with the floating valve body 7, the upper end portion 6a of the float valve body 6 is fitted into the recess 7b, thereby closing the small air hole 7a. The floating valve body 7 has a convex portion 7d formed on the upper surface thereof. The convex portion 7d is smaller than the large air hole 3a of the lid body 3, and when the floating valve body 7 rises, the convex portion 7d is loosely fitted into the large air hole 3a, and the peripheral portion of the convex portion 7d is the lid body. 3 0-rings 31 with good adhesion.

  The air valve 1X operates as follows. That is, when the cock 24 is opened and water enters the hollow portion 2c of the valve box 2 from the water conduit 100, the air in the hollow portion 2c of the valve box 2 is rapidly exhausted from the large air hole 3a by the water pressure. The At the same time, the floating valve body 7 and the float valve body 6 rise as the water level rises. As a result, as shown in FIG. 3 (a), the floating valve body 7 comes into close contact with the upper surface of the inner lid portion 3B to close the large air hole 3a, and the float valve body 6 comes into close contact with the floating valve body 7 to reduce its small size. In order to close the air hole 7a, the hollow portion 2c of the valve box 2 has an air reservoir A and a water reservoir W up and down, and is completely sealed. After such a sealed state, when air enters the hollow portion 2c of the valve box 2 through the water pipe 100 and enters the hollow portion 2c of the valve box 2, the pressure of the air reservoir A in the hollow portion 2c of the valve box 2 increases, and the water is retreated. The water level goes down. The float valve body 6 descends as the water level falls, while the floating valve body 7 remains pushed up by the internal pressure of the air reservoir A. Then, as shown in FIG. 3B, the float valve body 6 is separated downward from the floating valve body 7, and the air is discharged to the outside of the valve box 2 through the small air hole 7a and the large air hole 3a. . And again, the water level rises and the hollow portion 2c of the valve box 2 is completely sealed.

  Here, the normal valve such as the air valve 101 of FIG. 11 described in the background art section is generally difficult to operate normally when tilted by 2 degrees or more from the vertical direction, and is installed within that range. When the float valve body 6 of the air valve 1X according to the embodiment of the present invention is installed in the vertical direction, the float valve body 6 is in close contact with the surface of the valve seat 71 of the floating valve body 7 as shown in FIG. As shown in FIG. 4 (b), the float valve element 6 is long in the case where it is installed from the vertical direction. Therefore, the water level is usually in contact with the inner side surface of the upper side wall while the cylindrical side surface is in contact with it. The tip of the floating valve body 7 comes into close contact with the surface of the valve seat 71 of the floating valve body 7. The relative positional relationship between the float valve element 6 and the valve seat 71 in FIG. 4B is such that the float valve element 6 in FIG. 4A is in the radial direction, and the gap g between the float valve element 6 and the inner side surface of the side wall. Only translated. Accordingly, the inverted frustoconical recess 7b of the floating valve body 7 is sized so as not to hinder its parallel movement. Further, the tip of the upper end portion 6a of the float valve body 6 is in close contact with the valve seat 71 in a direction close to a flat surface. In the experiment by the present inventor, a curved surface with a radius of curvature up to 1 to 3 times the height (height) L of the float valve body 6 is desirable, and the air valve 1X operates without problems even when tilted 30 degrees from the vertical direction. Has been confirmed. Therefore, it is possible to install the air valve 1X at a place where maintenance work can be performed easily and quickly, whether it is up or down.

  Next, a procedure for maintenance work of the air valve 1X will be described. First, the manhole cover or the like is removed as necessary so that the air valve 1X appears. At this time, if the water overflows, there is a possibility that the small air hole 7a remains open without being blocked by the float valve body 6 due to the attachment of dust or the like and leaks. Next, the cock 24 is closed to block communication between the water pipe 100 and the hollow portion 2c of the valve box 2 so that water does not flow in during operation.

  Next, the screw 41 of the cover fixing screw 41 is loosened and removed. At this time, normally, water is ejected from the screw hole 2h of the valve box 2, but the normal operation of the air valve 1X can be confirmed by the water pressure. Temporarily, the floating valve body 7 and the float valve body 6 were fixed, and even when the water level dropped, the float valve body 6 did not descend and the small air holes 7a remained blocked and air was not discharged. In some cases, air will erupt. In this way, even if the air valve 1X is not disassembled, it can be determined by observation from the outside whether or not the air valve 1X is operating normally. If the air valve 1X does not operate normally, the air valve 1X will be disassembled. At that time, the internal pressure due to the accumulated compressed air can be reduced and the disassembly work such as removal of the lid 3 can be started. It becomes possible to work quickly while avoiding the possibility of the lid 3 being blown off by an abnormal internal pressure at the moment when the positions 22 and 22 are set to the second position. Also in the air valve 101 of FIG. 11 described in the background art section, if the screw hole communicating with the hollow portion 102c from the outside is formed and the screw is screwed, the air valve 101 need not be disassembled. By loosening the screw and observing whether water is ejected or air is ejected, it is possible to determine whether the floating valve body 107 and the float valve body 106 are firmly attached to each other.

  Next, as shown in FIG. 5A, the lever cover 4 is removed and the lid 3 is removed. As shown in FIG. 5B, the levers 22 and 22 are moved to the second position, and the pressure contact state between the lid 3 and the levers 22 and 22 is released. And as shown in FIG.5 (c), the cover body 3 is pulled up and removed. Here, the outer lid portion 3A and the inner lid portion 3B are integrated, and the outer lid body 103A, the upper inner lid body 103Ba, and the lower inner lid body 103Bb of the air valve 101 in FIG. 11 described in the background art section. Therefore, the lid 3 can be easily and quickly removed from the valve box 2.

  When the inspection, cleaning, or repair work is completed, the valve body guide 5, the float valve body 6, and the floating valve body 7 are returned to the hollow portion 2c of the valve box 2, the lid body 3 is fitted, and the levers 22 and 22 are moved to the first position. At the position, the lid 3 and the levers 22 and 22 are attached in pressure contact. Then, the lever cover 4 is installed, and the screw 41 is screwed into the screw hole 2 h of the valve box 2. If necessary, replace the manhole cover, etc. Thus, the air valve 1X can be easily and quickly assembled.

  That is, in the air valve 1X, the lid 3 is fixed and released by rotating the levers 22 and 22 of the valve box 2, so that the assembly including the maintenance work can be easily and quickly performed without using a tool. And disassembly work becomes possible.

  Next, an air valve 1Y according to a second embodiment of the present invention will be described. Like the air valve 1X, the air valve 1Y includes a valve box 2, a lid 3, a valve body guide 5, a float valve body 6, a floating valve body 7, and a lever cover 4, and a portion of the air valve 1X. There are many parts corresponding to. In the following description, parts corresponding to the parts of the air valve 1X are denoted by the same reference numerals. 6A is a front view of the air valve 1Y, and FIG. 6B is a cross-sectional view (cross-sectional view in front view). 7A and 7B are cross-sectional views illustrating a cover fixing screw 41 and the like of the air valve 1Y. FIG. 7A is a view immediately after the lid 3 is fitted into the valve box 2. FIG. The state, (b), shows the state where the lid body 3 is then rotated and the lever cover 4 is mounted. 8A and 8B are plan views for explaining the mounting operation of the lid 3 of the air valve 1Y. FIGS. 9A to 9C are cross-sectional views sequentially showing the disassembling procedure of the air valve 1Y. In the cross-sectional views other than FIG. 9C, the cross-section background portion of the valve element guide 5 is omitted. The air valve 1Y is of a type that does not have a cock 24, and is normally used by connecting a separate repair valve 100 'having a cock 24 between the air valve 1Y and the water pipe 100. It is. Hereinafter, the structure of the components of the air valve 1Y will be described together with the functions thereof. In addition, since those skilled in the art can easily understand the same parts as those of the air valve 1X, description thereof is omitted.

  The valve box 2 of the air valve 1Y does not have the cock 24 in the water guide portion 2d, and communicates with the water guide portion 100d of the repair valve 100 'through the water inlet 2b at the end of the short water guide portion 2d. The hollow portion 2c of the valve box 2 has a space from the vent 2a at the upper end to the vicinity of the lower end because the water guiding portion 2d is short. Insertion grooves 2k and 2k for inserting later-described two insertion portions 3D and 3D of the lid 3 are formed in the circumferential direction on the inner side surface near the vent 2a (see FIG. 9C). . The lid mounting portion at the entrance of the insertion grooves 2k, 2k is a downward slope so that the lid 3 cannot be pressed by the levers 22, 22 while the insertion sections 3D, 3D are not securely inserted into the insertion grooves 2k, 2k. Portion 2ka and 2ka (see FIG. 9C). On the upper part of the side wall of the valve box 2, a cover mounting male screw 2m for attaching the lever cover 4 by hand tightening with a nut is provided. Below the lid body receiving portion 2f, the inner surface of the side wall is bent slightly inward, and a valve body guide support portion 2n that contacts and supports the flange portion of the valve body guide 5 is formed. Although the water guide part 2d is a little smaller than the hollow part 2c, it is a short, substantially cylindrical pipe having a relatively large diameter. In the figure, the diameter of the water guide portion 2d is different between the front view and the side view. The cover fixing portion 2g 'in which the screw hole 2h is formed is larger than that of the air valve 1X in FIG. 7, but the basic structure is the same. The cover fixing portion 2g 'may not necessarily protrude outward as long as the outer surface of the valve box 2 and the inner surface of the lever cover 4 are in contact with each other. Therefore, the valve box 2 does not have the lever cover receiving portion 2g, the valve body guide receiving portion 2i, the cock 24, and the cock cover 25 in the air valve 1X. In the valve box 2 of the air valve 1Y, the description other than the above is the same as that of the air valve 1X.

  The lid body 3 of the air valve 1Y is formed by integrally forming an inner lid portion 3B and two insertion portions 3D and 3D provided on the periphery of the upper surface of the inner lid portion 3B. Therefore, the lid 3 does not have the outer lid portion 3A and the column portion 3C in the air valve 1X. The insertion portion 3D is formed with a step so that the end portion 3Da is thin, and the end portion 3Da protrudes outward from the outer surface of the inner lid portion 3B (see FIG. 7A). As shown in FIG. 8 (a), the lid 3 is mounted by placing the two insertion portions 3D and 3D on the lid mounting portion at the inlet of the insertion grooves 2k and 2k of the valve box 2, The inner lid 3B is fitted. And as shown in the figure (b), it rotates clockwise and the two insertion parts 3D and 3D are inserted in the insertion grooves 2k and 2k, and then the levers 22 and 22 are rotated. This is because, in the unlikely event that the cover fixing screw 41 is screwed into the screw hole 2h without mounting the lever cover 4 by mistake, the cover 3 and the levers 22 and 22 can be removed during maintenance work. This is to avoid the possibility that the lid 3 will blow off when the pressure contact state is released. The lid 3 of the air valve 1Y is not provided with the O-rings 31 and 32 in the air valve 1X. In the lid 3 of the air valve 1Y, the description of the air valve 1Y other than the above is the same as that of the air valve 1X.

  The lever cover 4 of the air valve 1Y has a cylindrical shape having a top portion. The top portion 4b of the lever cover 4 functions in place of the outer lid portion 3A of the air valve 1X, and the cover mounting male screw 2m of the valve box 2 is inserted therethrough when the lever cover 4 is mounted. A hole is formed. The lever cover 4 has a height and an inner diameter so that most of the levers 22 and 22 in the first position can be accommodated. In FIG. 7, the screw 41 for fixing the cover is in the shape of a bolt with a handle and is larger than that of the air valve 1X, but the basic structure is the same. Further, in FIG. 7, the screw 41 is not connected to the lever cover 4 or the like by a wire or a chain, but can be connected. In the lever cover 4 of the air valve 1Y, the description other than the above is the same as that of the air valve 1X.

  A disc-shaped rectifying plate 5A having a rectifying hole 5Aa in the center is attached to the bottom of the valve body guide 5 of the air valve 1Y. In the rectifying plate 5A, the diameter of the rectifying hole 5Aa is smaller than the diameter of the water guiding portion 2d, and the main body 5Ab around the rectifying hole 5Aa is superposed on the position of the window hole 5b at the bottom of the valve element guide 5. . Therefore, the rectifying plate 5A allows air (in the case of a large amount of exhaust) or water (in the case of exhaust under pressure) from the water guide 2d to flow into the window hole 5b at the same flow rate regardless of the diameter of the water guide 2d. Therefore, the flow of air or water can be adjusted so as not to disturb the normal operation of the float valve body 6. In addition, the window hole 5a on the upper side of the valve element guide 5 of the air valve 1Y is notched from the upper end (see FIG. 9C). In the valve element guide 5 of the air valve 1Y, the description other than the above is the same as that of the air valve 1X.

  The float valve body 6 of the air valve 1Y is the same as that of the air valve 1X.

  The floating valve body 7 of the air valve 1Y is provided with an O-ring 72 instead of the O-ring 31 provided on the lid 3 in the air valve 1X. In the floating valve body 7 of the air valve 1Y, the description other than the above is the same as that of the air valve 1X.

  The operation of the air valve 1Y is the same as the operation of the air valve 1X described above. The maintenance procedure for the air valve 1Y is as follows: when the lever cover 4 is attached / detached, the nut is manually screwed in and out of the cover mounting male screw 2m, and when the cover 3 is attached / detached, Except for the operation of inserting the insertion portions 3D and 3D into the insertion grooves 2k and 2k, as shown in FIGS. 9A to 9C, it is the same as the case of the air valve 1X and can be easily performed without using a tool. Assembly and disassembly work including maintenance work can be performed quickly. In addition, the cover body 3 is rotating between FIG.9 (b) and the same figure (c).

  The air valve 1Y can be used as a temporary fire hydrant. FIG. 10 shows the lever cover 4, the lid 3, the valve body guide 5, the float valve body 6, and the floating valve body 7, and the insertion type (machino type) base 8 is inserted into the hollow portion 2 c of the valve box 2. It is sectional drawing which shows the state which set 22 and 22 to the 1st position. An engagement groove 3c ′ similar to the concave engagement groove 3c of the lid 3 is formed in the base 8. The engagement portions 22b and 22b of the levers 22 and 22 of the valve box 2 are engaged with the engagement groove 3c ′. The base 8 is firmly joined to the valve box 2. In this state, the fire hose can be connected to extinguish the fire. Since the water guide portion 2d has a relatively large diameter, a large amount of water can be supplied. When the base 8 is removed, the levers 22 and 22 are set to the second position. In addition, an angle valve can be attached in the state shown in FIG. 10 and used for water supply in the event of a disaster. Furthermore, the state shown in FIG. 10 may be used in order to conduct an investigation by introducing an in-pipe investigation camera or a pressure gauge into the water pipe 100.

  As mentioned above, although the air valve which concerns on embodiment of this invention was demonstrated, this invention is not restricted to what was described in embodiment, Various design change within the range of the matter described in the claim is carried out. Is possible. For example, such an air valve can be integrally attached to a normal fire hydrant. Of course, the shapes and structures of the valve box, the lid, the valve body guide, the float valve body, the floating valve body and the like described in the embodiments can be modified as appropriate. It is also possible to easily make the air valve 1X a type without the cock 24 or make the air valve 1Y a type with the cock 24.

1X, 1Y Air valve 2 Valve box 2a Valve box vent 2b Valve box water inlet 2c Valve box hollow part 2d Valve box water guide part 2g 'Cover fixing part 2h Valve box screw hole 22 Lever 22a Lever operation part 22b Lever engaging portion 3 Lid 3B Lid inner lid 3a Lid large air hole 3b Lid lower cylinder 3c Lid engaging groove 4 Lever cover 41 Screw 5 Valve guide 5A Current plate 5Aa Rectification hole 6 Float valve body 7 Floating valve body 7a Small air hole of the floating valve body

Claims (8)

It has a vent at the upper end and a water vent at the lower end, and has a valve box with a hollow part inside the vent and a water guiding part below it, and a large air hole facing the vent of the valve box. A lid mounted on the valve body guide, a valve body guide disposed in a hollow portion of the valve box, a float valve body disposed inward of the valve body guide, and an inner side of the valve body guide An air valve comprising: a floating valve body disposed above the float valve body and having a small air hole facing the large air hole of the lid body;
The lid is formed by extending a lower cylindrical portion that fits into a hollow portion of the valve box, and forming a concave engagement groove on an outer surface of the lower cylindrical portion,
The valve box is rotatably provided with a lever having an operating portion on one side and an engaging portion that can be pressed against the engaging groove of the lid on the other side,
In the lever, the engaging portion is in pressure contact with the engaging groove of the lid body at the first position, and the engaging portion is separated from the engaging groove of the lid body at the second position. Air valve to do. It has a vent at the upper end and a water vent at the lower end, and has a valve box with a hollow part inside the vent and a water guiding part below it, and a large air hole facing the vent of the valve box. A lid mounted on the valve body guide, a valve body guide disposed in a hollow portion of the valve box, a float valve body disposed inward of the valve body guide, and an inner side of the valve body guide An air valve comprising: a floating valve body disposed above the float valve body and having a small air hole facing the large air hole of the lid body;
The valve box is formed with a hole through which a hollow portion can communicate with the outside so that air is ejected when the floating valve body and the float valve body are fixed, and water is ejected when the floating valve body is not fixed. An air valve characterized by. The air valve according to claim 1,
The air valve further comprising a lever cover that covers the outside of the lever and is detachably attached to the valve box. The air valve according to claim 3,
The lever cover has a cover fixing hole,
The valve box is formed with a hole through which the hollow portion and the outside can be communicated so that air is ejected when the floating valve body and the float valve body are fixed, and water is ejected when the floating valve body is not fixed,
An air valve characterized in that the lever cover is attached to the valve box by screwing a screw into the hole of the valve box through a cover fixing hole. In the air valve according to any one of claims 1 to 4,
The air valve according to claim 1, wherein the float valve body has an elongated substantially cylindrical shape, and an upper end portion is formed in a truncated cone shape. The air valve according to any one of claims 1 to 5,
An air valve, wherein an insertion portion is formed in the lid body, and an insertion groove for rotating the insertion portion to be inserted in the valve box is formed in a circumferential direction. The air valve according to any one of claims 1 to 6,
An air valve characterized in that a rectifying plate having a rectifying hole having a diameter smaller than that of the water guide portion in the center is provided below the bottom of the valve body guide. It has a vent at the upper end and a water vent at the lower end, and has a valve box with a hollow part inside the vent and a water guiding part below it, and a large air hole facing the vent of the valve box. A lid mounted on the valve body guide, a valve body guide disposed in a hollow portion of the valve box, a float valve body disposed inward of the valve body guide, and an inner side of the valve body guide A floating valve body disposed above the float valve body and having a small air hole facing the large air hole of the lid body,
A method for disassembling an air valve, characterized in that, before removing the lid, air or water is ejected from the hollow portion through a hole that allows the hollow portion to communicate with the outside.

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