JPH08326986A - Water hammer absorbing device - Google Patents

Abstract

PURPOSE: To absorb a water hammer generated in a water duct in a good efficiency, by packing an elastic body including a hollow filler or an indipendent bubbles at the bottom side, together with a rubber diaphragm opening to the water duct side, in a casing. CONSTITUTION: This water hammer absorbing device 1 is to be installed to a water duct 51 allowable to connect and disconnect, through an installing metal fitting 2, and when a water hammer is generated at the water duct side, the water hammer applied through the water hammer leading-in hole 2b of the installing metal fitting 2 operates to the inner peripheral surface of the expansion space of a rubber diaphragm 3, and the bottom 3b of the rubber diaphragm 3 is to be pressed to the upper side. And by applying the pressing force by the expansion of the rubber diaphragm 3 to the whole body of an elastic body 6 including a hollow filler evenly through a pressure receiving plate 5, the water hammer is absorbed in a good efficiency. That is, an excellent water hammer absorbing function in obtained by the synergetic effect of the expansion of the rubber diaphragm 3 and the contraction of the elastic body 6 including the hollow filler.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water hammer absorbing device capable of favorably absorbing a water hammer generated in a water pipe.

[0002]

2. Description of the Related Art Conventionally, there is a water hammer absorption device having a structure as shown in FIG. 12, for example, and a rubber bellows 53 made of synthetic rubber is installed inside a cover 52 attached to a water pipe 51. Therefore, a water hammer generated when, for example, a single-lever water faucet 54 or the like provided in the water pipe 51 is suddenly closed is introduced into the rubber bellows 53 as indicated by an arrow, and the water bellows 53 is used. It is configured to absorb a water hammer, and in such a conventional structure, there is a problem that the rubber bellows 53 is fully stretched due to long-term use and the water hammer absorbing function is deteriorated. If the space S between the rubber bellows 53 and the cover 52 is not wide enough, the water hammer absorption capacity will be reduced, and the cover 52 will have a considerably large diameter, resulting in an increase in size. There was.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems of the prior art, and an object thereof is not to provide a water hammer absorbing device which is small in size and can exhibit extremely good water hammer absorbing ability. The first gist of the invention is that the casing is provided with a rubber diaphragm that opens toward the water conduit and an elastic body containing hollow fillers or closed cells inside the casing. The second gist is that a pressure receiving plate is interposed between the rubber diaphragm and the hollow filler-containing or closed-cell elastic body. A third gist is that the elastic body is formed with a spherical concave portion that wraps the bottom portion of the rubber diaphragm when the bottom portion at the tip of the rubber diaphragm expands due to a water hammer and prevents the rubber diaphragm from spreading in the lateral direction. It is that. Further, a fourth gist is that a sliding contact projection portion is formed on a peripheral surface of the elastic body, which is in contact with the inner wall of the casing, for forming a gap for enhancing slidability with the inner wall of the casing. Is. Also, the fifth
The gist of is that the sliding contact member for improving the slidability of the rubber diaphragm and the elastic body is arranged on the inner wall of the casing.

[0004]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional configuration diagram of a water hammer absorption device 1. The water hammer absorption device 1 is configured to be attachable to a water pipe line 51 via a mounting bracket 2, and the mounting bracket 2 at the lower end is made of brass or It is made of stainless steel and has a water pipe 51
A screw 2a for attaching to a water hammer is formed, and a water hammer introducing hole 2b for vertically introducing a water hammer is formed vertically. A tool for hanging a tool is provided on the upper portion of the screw 2a. The hanging portion 2c is formed in a cut shape, and a flange portion 2d protruding outward is formed above the hanging portion 2c, and a fitting groove portion 2f is formed above the flange portion 2d by being recessed inward. It has become a thing.

A rubber diaphragm 3 is attached to the upper end of the mounting bracket 2 in a fitting manner. The rubber diaphragm 3 has a hardness of rubber hardness of 50 ° to 70 ° and is shown in a sectional view in FIG. As shown, the lower end has a horseshoe-shaped cross section with an opening K formed therein. A fitting convex portion 3a is formed on the inner peripheral side of the opening K at the lower end so as to project inward, and the fitting convex portion 3a is fitted into the fitting groove portion 2f of the mounting bracket 2. . An orifice projection 3c is formed above the fitting projection 3a so as to project further inward.
A narrow orifice passage is formed by the orifice protrusion 3c. The upper surface side of the orifice projection 3c is a water draining taper surface 3d that is gently inclined,
Above the water draining tapered surface 3d is a substantially circular inner peripheral surface 3e, which forms an expansion space S capable of absorbing a water hammer. Further, both ends of the bottomed portion 3b at the upper end are gently curved rounded portions 3f, and a uniform thickness t is formed from the bottomed portion 3b to a lower portion of the rounded portion 3f. Is set to have uniform stretchability, and the thickness t of the bottomed portion 3b is about 4.4 mm. The expansion space S from the inner peripheral surface 3e of the bottomed portion 3b to the orifice protrusion 3c is formed in an arc surface having a radius of about 7 mm. Further, more preferably, the bottomed portion 3b
It is preferable that the inner periphery of the expansion space S from the inner peripheral surface 3e to the orifice protrusion 3c be water repellent. The drainage taper surface 3d is for satisfactorily letting water remaining in the expansion space S escape to the opening K side, and is particularly formed so as to exhibit an antifreezing effect in cold regions. .

Next, returning to FIG. 1, a pressure receiving plate 5 is horizontally arranged on the upper end of the bottomed portion 3b of the rubber diaphragm 3, and an elastic body 6 containing a hollow filler is further arranged above it. Has been done. The rubber diaphragm 3, the pressure receiving plate 5 and the hollow filler-containing elastic body 6 are surrounded by a stainless steel casing 4, and the casing 4 is opened at the lower end thereof and bent into a fitting portion 4 which is bent.
b, the fitting 4b is fitted below the flange 2d of the mounting bracket 2, and the casing 4 is mounted on the mounting bracket 2
The hollow filler-containing elastic body 6 is attached and fixed to the inner bottom portion 4c of the upper end of the casing 4 by, for example, a double-sided tape or the like.

The pressure receiving plate 5 and the elastic body 6 containing the hollow filler are not adhered to each other. For example, the surface of the pressure receiving plate 5 can be brought into a non-contact state by fluorine coating or the like. A force is uniformly applied to the entire elastic body 6 containing the hollow filler. The pressure receiving plate 5 may be made of metal such as stainless steel or resin such as acrylic and may be formed in a disc shape.

The hollow filler-containing elastic body 6 may be, for example, β gel (trade name) manufactured by Siegel Co., Ltd. or MNCS (trade name) manufactured by Bridgestone Co., Ltd., and the hollow filler is mixed therein. The gel is formed into a gel. As the hollow filler mixed in the inside, it is preferable to use, for example, Expancel 091DE (trade name) manufactured by Nippon Philite Co., which has high heat resistance and pressure resistance, and the heat and pressure resistance hollow filler is 3 to 5% by weight. (Preferably 4%) The hollow filler-containing elastic body 6 can be manufactured by uniformly mixing it inside.
Further, the outer periphery of the hollow filler-containing elastic body 6 can be coated with a non-permeable film to increase the tear strength of the hollow filler-containing elastic body 6.

As shown in FIG. 3, it is possible to form the hollow filler-containing elastic body 6 by mixing the closed cells 6b into the resin base material 6a which constitutes the hollow filler-containing elastic body 6. As shown in FIG. 4, a hollow rubber ball 6c can be put in the resin base material 6a to form the hollow filler-containing elastic body 6.

When manufacturing such a water hammer absorbing device 1, first, the rubber diaphragm 3 is fitted to the upper end of the mounting member 2 and the fitting convex portion 3a is fitted in the fitting groove portion 2f so as to be integrated. On the other hand, after the casing 4 has been drawn through a press die, the hollow filler-containing elastic body 6 is attached.
The bottom surface of the central portion of the casing is bonded and fixed with double-sided tape or the like, and in that state, the fitting portion 4b of the casing 4 is bent below the collar portion 2d of the mounting bracket 2 through the press die to form the casing 4
Can be firmly connected and integrated in a state in which they are prevented from coming off from the mounting bracket 2, and when the casing 4 is integrally connected to the mounting bracket 2 using the press die in this way, the outer periphery is surrounded by the casing 4. The rubber diaphragm 3 and the hollow filler-containing elastic body 6 are internally provided.
At the time of this molding, the pressure receiving plate 5 can be formed between the rubber diaphragm 3 and the elastic body 6 containing the hollow filler.

In such a structure, when a water hammer occurs on the water pipe 51 side, the water hammer is applied to the rubber diaphragm 3 through the water hammer introducing hole 2b of the mounting bracket 2, and the water hammer is expanded in the expansion space of the rubber diaphragm 3. By acting on the inner peripheral surface of S, the bottomed portion 3b of the rubber diaphragm 3 is pressed upward, whereby a uniform pressing force is applied to the entire hollow filler-containing elastic body 6 via the pressure receiving plate 5, and the rubber diaphragm 3 and the elastic body 6 containing the hollow filler can absorb water hammer satisfactorily, and exert an excellent water hammer absorbing function by the synergistic effect of expansion of the rubber diaphragm 3 and contraction of the elastic body 6 containing the hollow filler. .

A wide space is not required above the rubber diaphragm 3 as in the conventional case, and even if the elastic body 6 containing the hollow filler is made small in size, a sufficient water hammer absorbing function can be exerted. The entire device 1 can be made small in size, and the elastic body 6 containing the hollow filler backs up the rubber diaphragm 3, so that the durability of the rubber diaphragm 3 is dramatically improved as compared with the conventional one. If the hollow filler-containing elastic body 6 has a small size, it can be manufactured at a reduced cost. The hollow filler-containing elastic body 6 has the drawbacks of low mechanical strength and the surface being scraped.
In this example, since the hollow filler-containing elastic body 6 is arranged on the back side of the rubber diaphragm 3, the hollow filler-containing elastic body 6 is not directly hit by a water hammer and should be arranged on the back side of the rubber diaphragm 3. The drawbacks can be eliminated.

Next, FIG. 5 is a cross-sectional configuration diagram of a water hammer absorbing device showing a modified example. In FIG. 5, the shape of the elastic body 6 containing the hollow filler is changed and the pressure receiving plate 5 is omitted. Is. That is, the elastic body 6 containing the hollow filler
6 is formed in a shape as shown in a perspective view in FIG. 6. In FIG. 6, the hollow filler-containing elastic body 6 is shown upside down, and a spherical surface is provided on the bottom surface side of the hollow filler-containing elastic body 6. 6 d is formed in a spherical shape, and the spherical concave portion 6 d is a bottomed portion 3 b of the rubber diaphragm 3.
It is formed in a spherical shape corresponding to the spherical shape of.

Further, the hollow filler-containing elastic body 6 is formed so that its transverse cross section has a substantially quadrangular shape, and each corner portion of the quadrangle is slidably protruding outward in a rounded shape.
e, 6e, 6e are formed, and when such a hollow filler-containing elastic body 6 having a substantially quadrangular cross section is housed in the casing 4, the hollow filler is filled in the inner peripheral surface of the cylindrical casing 4. Sliding contact protrusions 6e, 6 of the elastic body 6
e, 6e, 6e are in contact with each other, and therefore the entire outer circumference of the hollow filler-containing elastic body 6 is not in contact with the inner peripheral surface of the casing 4, so that the inner peripheral surface of the casing 4 and the outer peripheral surface of the hollow filler-containing elastic body 6 are not in contact with each other. A proper gap is formed between them, and this gap improves slidability of the hollow filler-containing elastic body 6 with respect to the casing 4 in the vertical direction.

That is, when a water hammer is applied to the expansion space S, the bottomed portion 3b of the rubber diaphragm 3 expands upward due to the water hammer as shown in FIG. 7, but at this time, the bottomed portion 3b of the rubber diaphragm 3 expands. It contacts the spherical concave portion 6d of the hollow filler-containing elastic body 6, and the bottomed portion 3b is wrapped in the spherical concave portion 6d, so that the lateral expansion of the bottomed portion 3b is satisfactorily prevented. In this state, the rubber diaphragm 3 The hollow filler-containing elastic body 6 is pressed upwards and is compressed upward, and at the time of this compression, the hollow filler-containing elastic body 6 can be slid upward with respect to the casing 4. Therefore, the bottomed portion 3b is wrapped by the spherical concave portion 6d, and the pressing force is uniformly transmitted from the bottomed portion 3b to the hollow filler-containing elastic body 6, and the hollow filler-containing elastic body 6 slides well on the casing 4. Therefore, the elastic body 6 containing the hollow filler is not biased and partially deformed, and the stress from the rubber diaphragm 3 is uniformly applied to the elastic body 6 containing the hollow filler, so that the rubber diaphragm 3 is locally deformed. Deformation and local deformation of the hollow filler-containing elastic body 6 are eliminated, so that durability is improved and a better water hammer prevention effect is obtained. Since the shape of the rubber diaphragm 3 is almost the same as that in FIG. 2 and the mounting member 2 is also the same as that in FIG. 1, the same reference numerals are given and the description thereof is omitted.

Further, as shown in a partial cross-sectional perspective view in FIG. 8, in order to improve the slidability of the hollow filler-containing elastic body 6, the hollow filler-containing elastic body 6 is formed in a cylindrical shape, Sliding contact protrusions 6e, 6e, 6e, 6e that bulge outward at predetermined angular intervals can be formed on the outer periphery of the elastic body 6 with a hollow filler having a shape as shown in FIG. Also, the sliding contact projections 6e, 6e, 6e, 6e come into contact with the inner wall surface of the casing 4, and a gap for enhancing slidability with the inner wall surface of the casing 4 is favorably formed. Therefore, the slidability of the hollow-filler-containing elastic body 6 at the time of compression is enhanced, the local deformation of the hollow-filler-containing elastic body 6 is eliminated, and the durability is enhanced.

Further, the hollow filler-containing elastic body 6 as shown in FIG. 9 may be formed. In the case of FIG. 9, the sliding contact projection 6f is formed in a lateral band on the outer peripheral side of the spherical recess 6d to the outside. It is formed by bulging, and a lateral strip-shaped sliding contact protruding portion 6f is formed on the other end side so as to face the sliding contact protruding portion 6f, and between the upper and lower sliding contact protruding portions 6f, 6f. When the hollow filler-containing elastic body 6 having such a shape is housed inside the casing 4, it is a horizontal band-shaped contact with the inner peripheral surface of the casing 4. The two sliding contact projections 6f, 6f, and the recessed portion 6g form a good gap with the inner wall surface of the casing 4, so that the hollow filler-containing elastic body 6 slides vertically when compressed. Durability of the hollow-filled elastic body 6 is improved due to excellent mobility. But the thing to improve.

Further, in order to further improve the slidability of the elastic body 6 containing the hollow filler during compression, FIG. 10 and FIG.
1, the sliding contact member 7 can be interposed between the inner peripheral surface of the casing 4 and the outer peripheral surface of the hollow filler-containing elastic body 6, and in FIG. A slidable contact member 7 in the shape of a cap, which is in contact with the entire area of the peripheral surface and the bottom part 4c and whose lower side is open, is fitted inside the casing 4, and in FIG. 7 is inserted. The sliding contact member 7 can be made of a material having extremely large slidability, such as polyacetal resin. Further, this sliding contact member 7 can be formed by attaching a Teflon tape to the inner peripheral surface of the casing 4.

By interposing the sliding contact member 7 in this way, the slidability of the rubber diaphragm 3 and the elastic body 6 containing the hollow filler in the up and down direction becomes very good, and the hollow filler is contained well during compression. Since the elastic body 6 is not compressed upward and does not locally deform, the durability of the rubber diaphragm 3 and the elastic body 6 containing the hollow filler can be extremely improved, and the water hammer absorption function is further improved. It will be able to be demonstrated.

The water hammer absorbing device 1 of each of the above embodiments,
When a water hammer test was performed on the conventional structure shown in FIG. 12, each of the examples described above exhibited a good water hammer absorbing function not only at the initial stage of use but also after the durability test as compared with the conventional structure. It is confirmed to be persistent. Further, it has been confirmed that, despite its compact size, it can absorb the impact sound at the time of water hammer as well as the conventional large-sized one, and exerts an excellent effect.

[0021]

According to the water hammer absorbing device of the present invention, the inside of the casing is provided with the rubber diaphragm which opens toward the side of the water pipe and the elastic body containing the hollow filler or the closed cells inside the casing. Being backed up by the elastic body containing hollow filler or closed cells on the side, it exhibits a good water hammer absorption function, and it can be made smaller, more compact, and cheaper than the conventional one, and its durability is dramatically higher than before. It has an effect that it can be used as a water hammer absorption device that is improved. In addition, since the pressure receiving plate is interposed between the rubber bellows and the elastic body containing the hollow filler or the closed cells, the pressure is uniformly applied to the hollow filler filled or closed cell elastic body through the pressure receiving plate. Since it is added, there is an effect that a more excellent water hammer absorption function can be exhibited. In addition, the elastic body is formed with a spherical concave portion that wraps the bottomed portion of the rubber diaphragm when the bottomed portion of the tip end of the rubber diaphragm expands due to a water hammer and prevents lateral expansion. When the rubber diaphragm expands due to the impact, the bottom of the rubber diaphragm abuts the spherical recess of the elastic body, and the bottom of the rubber diaphragm is wrapped in the spherical recess to prevent the rubber from expanding in the lateral direction and the pushing force from the rubber diaphragm. Has an effect that it can be uniformly applied to the entire elastic body, local deformation of the rubber diaphragm and the elastic body can be prevented, durability can be dramatically improved, and an excellent water hammer absorbing function can be exerted. Further, on the peripheral surface of the elastic body which is in contact with the inner wall of the casing, a sliding contact projection portion for forming a gap for improving slidability is formed between the elastic body and the inner wall of the casing. When a compressive force is applied from the diaphragm, the elastic body slides well along the inner peripheral surface of the casing and contracts, preventing the elastic body from being locally deformed and damaging the elastic body. The absorption function is enhanced and the durability of the elastic body is improved. Further, by disposing the sliding contact member for enhancing the slidability of the rubber diaphragm and the elastic body on the inner wall of the casing, the rubber diaphragm and the elastic body can be slidably moved through the sliding contact member. Therefore, it has an effect that a good water hammer absorption function can be exhibited and the durability of the rubber diaphragm and the elastic body is improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional configuration diagram of a water hammer absorbing device.

FIG. 2 is a cross-sectional configuration diagram of a rubber diaphragm.

FIG. 3 is a schematic configuration diagram showing a modified example of an elastic body containing a hollow filler.

FIG. 4 is a configuration diagram showing a further modified example of an elastic body containing a hollow filler.

FIG. 5 is a cross-sectional configuration diagram showing a modified example of the water hammer absorption device.

FIG. 6 is a perspective configuration diagram of an elastic body containing a hollow filler in FIG.

7 is a cross-sectional configuration diagram showing an operation of the water hammer absorbing device of FIG.

FIG. 8 is a partial cross-sectional perspective view of a modified example of an elastic body containing a hollow filler.

FIG. 9 is a perspective view of a further modified example of an elastic body containing a hollow filler.

FIG. 10 is a cross-sectional configuration diagram in which a cap-shaped sliding contact member is provided inside the casing of the water hammer absorbing device.

FIG. 11 is a cross-sectional configuration diagram of a water hammer absorbing device in which a cylindrical sliding contact member is interposed in a casing.

FIG. 12 is a cross-sectional configuration diagram of a conventional water hammer absorption device.

[Explanation of symbols]

 1 Water Hammer Absorbing Device 2 Mounting Metal Fitting 2b Water Hammer Introduction Hole 2f Fitting Groove 3 Rubber Diaphragm 3a Fitting Convex 3b Bottomed 3c Orifice Projection 3d Drain Tapered Surface 4 Casing 4b Fitting 5 Pressure Receptive Plate 6 Elastic with Hollow Filler Body 6d Spherical recess 6e Sliding contact projection 7 Sliding contact member S Expansion space

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Tokimasa Kamiya 5-1-1, Koiemotocho, Tokoname City, Aichi Prefecture Inax Co., Ltd. (72) Inventor Motohiko Hattori 5-1-1, Koiemotocho, Tokoname-shi, Aichi Stock Company Inax, Inc. (72) Inventor, Katsumi Iwai 5-1-1, Koiemoto-cho, Tokoname City, Aichi Prefecture, Inax Inc.

Claims (5)

[Claims] 1. A water hammer absorption device, characterized in that, in a casing, a rubber diaphragm that opens toward a water conduit is provided, and an elastic body containing a hollow filler or containing closed cells is provided inside the casing. 2. The water hammer absorbing device according to claim 1, wherein a pressure receiving plate is interposed between the rubber diaphragm and the elastic body containing the hollow filler or containing closed cells. 3. A spherical concave portion is formed in the elastic body so as to wrap the bottom end portion of the rubber diaphragm when the bottom end portion of the rubber diaphragm expands by a water hammer and prevent the rubber diaphragm from spreading in the lateral direction. Item 1. A water hammer absorption device according to item 1. 4. The sliding contact protrusion for forming a gap for enhancing slidability with the inner wall of the casing is formed on a peripheral surface of the elastic body which is in contact with the inner wall of the casing. The described water hammer absorbing device. 5. The water hammer absorption device according to claim 1, wherein a sliding contact member for enhancing slidability between the rubber diaphragm and the elastic body is provided on an inner wall of the casing.