JPH10325481A - Air valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air valve having an earthquake resistant mounting structure to eliminate a fear of looseness, leakage of water, and separation by eliminating a screwing-in joint at the mounting part of an air valve on a flange part for fastening a lower part fastened against a flange for fastening of a water transmission line. SOLUTION: In an air valve, a valve casing 2, having upper and lower end openings, comprising a valve casing body 3 and a small cylinder part 4 connected to the bottom of the body 3, is provided and the lower end opening of the small cylinder part 4 of the valve casing 2 is mounted on a mounting hole 8 formed in a flange part 7 for fastening a lower part fastened against the flange 52 for fastening of a water transmission line 51 in a manner to be communicated with the internal part of the water transmission line. At least the small cylinder part 4 of the valve casing 2 consists of a thin section hollow cylindrical metal fitting. A rubber ring 5 and a rubber ring presser 6 are fitted in the outer periphery of the small cylinder part 4 consisting of the cylindrical metal fitting for mounting. Thereafter, the rubber ring 5 is fitted in the mounting hole 8 of the flange part 7 for fastening through press-in. The inner surface of the lower end part of the small cylinder part 4 is formed in an expansion part 9, having a protrusion curved surface, having an outside diameter larger the mounting hole 8 such that the annular protrusion part of the rubber ring 5 is turned over and through into an out state and forced into pressure contact with the inner surface of the flange for fastening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water supply pipe having a seismic mounting structure at a lower portion thereof. The present invention relates to an air valve for discharging air and gas separated from water in a full water state where the inside of a pipe is further pressurized.

[0002]

2. Description of the Related Art Conventionally, many techniques have been disclosed for an air valve. For example, the one shown in FIG. 9 is a JIS B 2063 single-port air valve for water supply established in Japanese Industrial Standards. The air valve 50 has a valve box 55 attached to a fastening flange 52 of a T-shaped pipe 51 as a water supply pipe via a lower fastening flange 53 of the air valve 50 and a repair valve (water stopcock) 54. The lower end opening 56 of the valve box communicates with the inside of the T-shaped pipe 51, and a float 57 having an apparent specific gravity of 1 or less, which is housed in the valve box 55 and can freely move up and down and functions as a valve body, is provided with a water level in the valve box 55. It rises and descends in conjunction with the fluctuation, and opens and closes an air hole 60 provided in an elastic valve seat 59 fixed to the center of an upper lid 58 that closes an upper end opening of the valve box 55. The fastening flange 52 of the T-shaped pipe 52 of the air valve 50 described above.
When mounting to the flange 53, a male screw 61 tapered at the lower end opening small diameter part of the valve box 55 so that the tip has a small diameter is attached to the flange 53.
In order to form a tapered shape in the female screw hole 64 for valve mounting, the screw 63 is screwed. The flange 53 of the air valve 50 is fastened to the flange portion 52 of the T-shaped pipe 51 with a bolt nut 65.

The conventional air valve 50 mounted as described above has a mounting form of cantilever support with a tapered screw thread on a flange 53 fastened to a T-shaped pipe 51. If the screwing amount is small, the mounting strength is affected. In addition, since the position of the center of gravity of such an air valve 50 is relatively high, when an external load such as an impact is applied to the air valve 50, or when vibration occurs in the water pipe of the T-type pipe 51 due to an earthquake or other causes. The inertia causes the air valve 50 to sway, and loosening of the mounting and bending force concentrate on the mounting part, causing water leakage at the screwed part and damage to the male screw 61 and the female screw 63 at the part. May come off.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and provides an air valve for a lower fastening flange which is fastened to a fastening flange of a water pipe (T-shaped pipe). An object of the present invention is to provide an air valve having an earthquake-resistant mounting structure that eliminates a screw threaded portion in a mounting portion and does not cause loosening, leakage, or detachment of the portion.

[0005]

In order to achieve the above object, an invention according to claim 1 is to provide a valve box having upper and lower openings formed by a valve box main body and a small-diameter cylindrical portion connected to the bottom of the main body. Yes,
In the air valve mounted at the lower end opening of the small-diameter cylindrical portion of the valve box so as to be able to communicate with the inside of the water pipe in the mounting hole drilled in the lower fastening flange portion fastened to the fastening flange of the water pipe, at least the small diameter of the valve box The cylindrical part is formed by a thin hollow cylindrical fitting,
A rubber ring and a rubber ring retainer are fitted and mounted on the outer periphery of the small-diameter cylindrical portion made of this cylindrical metal fitting, and this rubber ring has an outwardly directed annular flange portion at an upper end portion and protrudes inward at a lower end portion. A small-diameter cylindrical portion having an annular protrusion and having a rubber ring and a rubber ring retainer attached thereto is pressed against the outer surface of the fastening flange by the flange portion of the rubber ring so that the rubber ring retainer presses the flange portion of the rubber ring from above. Press-fit into the mounting hole of the fastening flange and attach it, and the inner surface of the lower end of the small-diameter cylindrical portion is turned outward so that the annular protrusion of the rubber ring is inverted and pressed against the inner surface of the fastening flange. It is characterized in that the outer diameter is formed in the enlarged diameter portion of the convex curved surface larger than the mounting hole.

According to a second aspect of the present invention, in the first aspect, the bottom of the valve box main body presses the rubber ring presser from above. According to a third aspect of the present invention, in the first or second aspect, the rubber ring retainer has a downward flange on an outer peripheral side thereof for engaging with an outer peripheral surface of a flange portion of the rubber ring. According to a fourth aspect of the present invention, instead of the rubber ring presser according to any one of the first to third aspects, a rubber ring presser is integrally provided on the outer periphery of the small-diameter cylindrical portion. According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the small-diameter cylindrical portion is separate from the valve box main body, and the casing housing the water stopcock between the cylindrical portion and the valve box main body is provided. The upper end is connected to the lower end of the valve box main body, and the lower end is integrally connected to the upper end of the small-diameter tubular portion.

[0007]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional front view showing a first embodiment in which an air valve having an earthquake-resistant mounting structure portion is mounted in a mounting hole of a lower fastening flange portion fastened to a fastening flange of a water pipe. In the drawings, a water supply pipe and a fastening flange provided on the water pipe are omitted. Reference numeral 1 denotes an air valve, which has a valve box 2 made of a thin cylindrical metal fitting with upper and lower openings. The valve box 2 made of a cylindrical metal fitting is integrally formed by pressing stainless steel.
And a small-diameter hollow cylindrical portion 4 integrally provided at the bottom of the main body. A rubber ring 5 and a rubber ring retainer 6 are fitted and mounted on the outer periphery of the hollow cylindrical portion 4, and the rubber ring 5 and the rubber ring retainer 6 are attached to a mounting hole 8 formed in the flange portion 7 with the rubber ring 5 and the rubber ring retainer 6 mounted. The inner surface of the lower end portion of the hollow cylindrical portion 4 is press-fitted and mounted, and an inner diameter portion 9 having a convex curved surface is formed. The inner diameter of the enlarged diameter portion 9 of the hollow cylindrical portion 4 has an outer diameter larger than the diameter of the mounting hole 8, and the outer edge thereof is located near the inner surface of the flange portion 7. The rubber ring 5 is provided with an outwardly-facing annular flange portion 11 at an upper end portion, and an inwardly projecting annular projection portion 12 at a lower end portion.

At the time of mounting in the mounting hole 8, the annular flange portion 11 of the rubber ring 5 presses against the outer peripheral surface of the flange portion 7 around the mounting hole 8, and the annular projection 12 faces outward by forming the enlarged diameter portion 9. To be. The rubber ring presser 6 has a downward flange 13 on the outer peripheral edge. The flange 13 engages with and holds the upper peripheral surface of the upper end of the flange portion 11 of the rubber ring 5 when the rubber ring 5 is attached to the mounting hole 8. From above.
In this embodiment, the upper surface of the rubber ring presser 6 is formed so as to be inclined upward from the central portion to the peripheral portion, and the bottom surface of the valve box main body 3 can be brought into surface contact with a similarly formed inclined bottom surface. .

In the above description, the outer diameter d of the small-diameter hollow cylindrical portion 4 of the valve box 2 is set at the upper end opening of the rubber ring 5 as is apparent from FIG. 5 is slightly larger than the inner diameter e of the guide portion 14 which is slightly larger than the inner diameter a, and the diameter c of the mounting hole 8 is slightly larger than the outer diameter b of the body of the rubber ring 5.

FIG. 3 shows a diameter increasing jig for forming the lower end of the hollow cylindrical portion 4 of the valve box 2 into the enlarged diameter portion 9. This expanding jig 15
The upper end has an opening, and the bottom has a shaft hole 17 formed in a tapered surface 16 inclined downward, and a hook member projecting window 18 is cut out in a front peripheral wall facing the tapered surface 16 of the shaft hole. Spindle
20, a movable shaft 22 fitted in the shaft hole 17 of the main shaft 20 so as to be movable up and down, and a lower end bifurcated portion of the movable shaft 22 pivotally supported by a pin 23 so as to be tiltable at a predetermined angle with respect to the axis by a movable When the shaft 22 moves downward, the tapered surface 16 of the main shaft 20 slides and tilts to form the forming surface 25 into the window 18.
And a hook member 26 protruding outward from the hook member 26. The shaft hole 17 is drilled at a position slightly eccentric with respect to the center of the main shaft 20 so that the peripheral wall with the window 18 is thicker than the peripheral wall on the opposite side of the window 18 and can withstand a strong bending force. Has become. Another window 27 is cut out on the rear peripheral wall opposite to the window 18.

A spline 41 for separately attaching a handle is formed on an outer peripheral surface of an upper end portion of the main shaft 20. An upper end of the spline 41 is used for a cap nut 43 for fixing an adjusting nut 42 screwed to an upper male screw of the movable shaft 22. A screw 44 is formed concentrically with the shaft hole 17 of the movable shaft 22. The adjustment nut 42 adjusts the vertical movement position of the movable 22 by screwing and loosening or tightening the upper end male screw of the movable shaft 22 as described above. The cap nut 43 is removed when moving the movable shaft 22 up and down, and the hook member
26 is installed in a tilted position with the movable shaft 22
And serves to lock the spindle 20. At the same time hook member 26
Of the movable shaft 22 is also pressed and fixed by the enlarged portion 28 at the lower end of the movable shaft 22. An elevating screw 45 is formed on the outer peripheral surface of the main shaft 20 below the spline 41 to be screw-fitted to an elevating member (not shown). The outer diameter of the movable shaft 22 is larger than the width of the window 18 in the circumferential direction.

The diameter increasing jig 15 is mounted on a diameter expanding device (not shown), and the vertical movement of the diameter expanding jig 15, the vertical movement of the movable shaft 22, the rotation of the diameter expanding jig 15, and the minute vertical movement are performed by the device. Operated by

The procedure for attaching the air valve 1 to the water pipe 7 will be described below. In the lower fastening flange 7, rubber ring 5, rubber ring retainer 6, and valve box 2 of the air valve 1 provided as shown in FIG. 2A, the hollow cylindrical portion of the valve box 2 into which the diameter increasing jig 15 is inserted. 4
A rubber ring presser 6 is fitted into the rubber ring 5 from below.
(See the same figure (b)). Next, by operating the above-described diameter expanding device, the valve box 2 and the diameter expanding jig 15 are simultaneously lowered and gradually inserted from the lower end of the rubber ring 5 into the mounting hole 8. The part 11 comes into contact ((c) in the figure). When the valve box 2 and the expanding jig 15 are further lowered, the guide portion 14 of the rubber ring 5 is moved.
The hollow cylindrical part 4 is pushed into the rubber ring 5 and protrudes from the lower end surface of the rubber ring 5. The flange part 11 of the rubber ring 5 is strongly connected between the outer surface of the flange part 7 and the bottom of the valve body 3 via the rubber ring retainer 6. It is pressed (FIG. 4D).

As a result, the annular projection 12 of the rubber ring 5 is turned from the inside toward the outside to the outside, and the press-fitting of the rubber ring 5 causes the gap between the rubber ring 5 and the edge of the mounting hole 8 and the gap between the mounting hole 8. The seal between the inner peripheral surfaces and between the outer peripheral surfaces of the rubber ring 5 and the hollow cylindrical portion 4 is maintained. At this time, the lower end of the main shaft 20 of the diameter increasing jig 15 is slightly protruded from the lower end surface of the hollow cylindrical portion 4.

Next, the main shaft 20 is lowered while rotating, so that the pin 23 of the hook member 26 is lower than the lower end surface of the hollow cylindrical portion 4. Then, loosen the adjustment nut 42 and move the movable shaft
When the hook member 26 starts to move downward, the hook member 26 descends while sliding on the tapered surface 16 and stops while projecting from the window 18 as shown in FIG. After that, the adjustment nut 42 on the upper part of the movable shaft 22 is fixed with the cap nut 43. As a result, the hook member 26 is
, And the fixed and tilted state is maintained.

Next, the main shaft 20 is raised while being rotated in the opposite direction, so that the molding surface 25 of the hook member 26 is in contact with the lower end surface of the hollow cylindrical portion 4. After a while, the hook member 26 is
The jig 15 projecting from the window 18 moves upward and rotates while repeating small up and down movements, so that the lower end surface of the hollow cylindrical portion 4 is gradually enlarged to become a trumpet-shaped enlarged portion 9 ( (Fig. 4 (a), (b)). The outer diameter of the lower end of the hollow cylindrical portion 4 formed in the trumpet-shaped enlarged diameter portion 9 is equal to the mounting hole 8 of the flange portion 7.
Is larger than the caliber. When the diameter is increased, the inner surface of the lower end of the hollow cylindrical portion 4 that is pressed from the molding surface 25 of the hook member 26 disposed on the main shaft 20 that moves up and down in small increments (and rotates and moves up and down) is a rubber ring 5. The upper portion of the enlarged diameter portion 9 is easily formed without buckling so as to include the annular projecting portion 12 at the lower end portion thereof and press it against the lower surface of the flange portion 7.

When the diameter expansion is completed, the diameter expansion jig 15 is lowered, the cap nut 43 is loosened, the movable shaft 22 is raised, and the hook member 26 is inserted into the shaft hole 17.
Then, the adjusting nut 44 is loosened, and the expanding jig 15 is pulled up. Then, a float or the like is set in the valve box 2 as shown in FIG. 1, an upper cover is attached, and the air valve 1 has a normal configuration.

As described above, the air valve 1 mounted in the mounting hole 8 of the flange portion 7 is not mounted by screwing, and the inner surface of the lower end portion of the hollow cylindrical portion 4 of the valve box 2 is moved to the outside. Since it is formed in the enlarged diameter portion 9 having a convex curved surface so that the diameter is larger than the mounting hole 8, there is no possibility of loosening or water leakage. , Which has an earthquake-resistant mounting structure at the bottom. FIG. 5 shows a state after the mounting is completed. As shown in the figure, the flange portion 7 in which the air valve 1 is mounted in the mounting hole 8 is
A bolt nut 65 is attached to the upper fastening flange 52 of the T-shaped pipe 51 as a water pipe.

FIG. 6 shows a second embodiment. In this embodiment, a rubber ring retainer 6a is provided on the outer periphery of the upper end of the hollow cylindrical portion 4.
Are integrally fixed, and the other configuration is the same as that of the first embodiment. In such an embodiment, the same operation and effect as in the first embodiment can be expected.

FIG. 7 shows a third embodiment. In this embodiment, a repair valve (water stopcock) 47 is interposed similarly to the prior art, and a ball valve element 48 of the water stopcock 47 is provided. The outer shell (casing) 49 containing the inside and the hollow cylindrical portion 4 which is reduced in diameter and integrally extended at the lower portion thereof are made of stainless steel, and are attached to the flange portion 7 below the reduced diameter portion of the outer shell 49. The same mounting as in the first embodiment is performed on the hole 8. FIGS. 8A and 8B are operation diagrams corresponding to FIGS. 4A and 4B in the first embodiment.

[0021]

The present invention has the above-described configuration,
The mounting configuration of the lower portion of the air valve with respect to the mounting hole perforated in the lower fastening flange portion that is fastened to the fastening flange of the water pipe is not a mounting portion by screwing as in the related art, but via a rubber ring. Since the lower end of the hollow cylindrical portion press-fitted into the mounting hole is formed in the enlarged diameter portion, the following excellent effects can be expected. That is, (1) Even if an external load such as impact is applied to the air valve, or if the tilting force acts on the air valve due to the inertia due to the sway of the water pipe, the elastic force of the rubber ring should allow it. Therefore, looseness in the mounting portion and stress that breaks the mounting portion are not generated, and the cause of water leakage can be prevented. (2) When a pulling force acts on the air valve, the outer diameter of the enlarged diameter portion is larger than the inner diameter of the mounting hole. (3) Since the hollow cylindrical portion pushes and expands the rubber ring inserted into the mounting hole and press-fits the annular protrusion at the lower end of the rubber ring at the enlarged diameter portion and presses it against the lower surface of the flange, The surface pressure between the inner peripheral surface of the mounting hole and the outer peripheral surface of the rubber ring and the hollow cylindrical portion is equal, and the lower surface of the flange has the rubber ring pressing portion, so that there is no concern about the sealing mechanism. (4) In the first and second embodiments, the valve box main body and the small-diameter cylindrical portion are formed of stainless steel, and the valve box (exterior) can be reduced in weight. Can be smaller.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing a first embodiment of the present invention in which an air valve having an earthquake-resistant mounting structure is mounted in a mounting hole of a lower fastening flange portion fastened to a fastening flange of a water pipe; FIG.

FIGS. 2 (a) to 2 (d) are action diagrams showing a mounting procedure of the above.

FIG. 3 shows a diameter expansion jig, (a) is a longitudinal front view thereof, (b)
Is a side view, and (c) is a bottom view.

FIGS. 4A and 4B are cross-sectional views of a main part for explaining the operation.

FIG. 5 is a longitudinal sectional front view showing a state after completion of mounting.

FIG. 6 is a longitudinal sectional front view showing a state in which an air valve according to a second embodiment is attached to a mounting hole of a lower fastening flange portion fastened to a fastening flange of a water pipe.

FIG. 7 is a longitudinal sectional front view showing a third embodiment in which an air valve is mounted in a mounting hole of a lower fastening flange portion fastened to a fastening flange of a water pipe.

FIGS. 8A and 8B are main-portion cross-sectional views for explaining the operation of the third embodiment.

FIG. 9 is a vertical sectional front view showing a state in which a conventional air valve is attached to a mounting hole of a lower fastening flange portion fastened to a fastening flange of a water pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pneumatic valve 2 Valve box 3 Valve box main body 4 Hollow cylinder part 5 Rubber ring 6, 6a Rubber ring retainer 7 Lower fastening flange part 8 Mounting hole 9 Large diameter part 11 Annular flange part 12 Annular projection 13 Downward flange 14 Guide part 15 Diameter expansion jig 47 Repair valve (water stop valve) 48 Ball-shaped valve element 49 Outer shell (casing)

Claims (5)

[Claims] 1. A valve box having an upper and lower end opening comprising a valve box main body and a small-diameter cylindrical portion connected to the bottom of the main body, and a lower end opening of the small-diameter cylindrical portion of the valve box is used for fastening a water pipe. An air valve mounted in a mounting hole drilled in a lower fastening flange portion fastened to a flange so as to be able to communicate with the inside of a water pipe. At least a small-diameter cylindrical portion of the valve box is formed of a thin hollow cylindrical metal fitting. A rubber ring and a rubber ring retainer are fitted and mounted on the outer periphery of a small-diameter cylindrical portion made of metal fittings, and the rubber ring has an outwardly-facing annular flange portion at an upper end portion and an inwardly projecting annular projection at a lower end portion. The flange portion of the rubber ring is pressed against the outer surface of the fastening flange portion so that the rubber ring and the small-diameter cylindrical portion on which the rubber ring retainer is mounted are pressed so that the rubber ring retainer presses the flange portion of the rubber ring from above. Press-fit into the mounting holes in the The inner surface of the lower end portion of the cylindrical portion is formed into an enlarged portion of a convex curved surface whose outer diameter is larger than the mounting hole so that the annular protrusion of the rubber ring is turned outward and becomes inwardly pressed against the inner surface of the fastening flange portion. An air valve characterized in that: 2. The air valve according to claim 1, wherein a bottom portion of the valve box main body presses the rubber ring presser from above. 3. The air valve according to claim 1, wherein the rubber ring retainer has a downward flange on an outer peripheral side thereof, the downward flange engaging with an outer peripheral surface of a flange portion of the rubber ring. 4. An air valve comprising a rubber ring retainer integrally provided on the outer periphery of a small-diameter cylindrical portion instead of the rubber ring retainer according to claim 1. 5. A casing in which a small-diameter cylindrical portion is separate from a valve box main body, and a casing containing a water stopcock between the cylindrical portion and the valve box main body has an upper end connected to a lower end of the valve box main body. The air valve according to any one of claims 1 to 4, wherein a lower end is integrally connected to an upper end of the small-diameter cylindrical portion.