JPH0314640Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a water hammer absorber that can effectively absorb the water hammer phenomenon (also called water hammer phenomenon) that occurs in water supply pipes or hot water supply pipes. be.

(Prior Art and its Problems) Conventionally, there is a water hammer absorber disposed in a water supply pipe, etc., as shown in FIG. 6, for example.

That is, the water hammer absorber 3 is constructed by connecting a spherical case 4 to a cheese 2 connected to a water supply pipe 1, and inside the spherical case 4, the inside of the case 4 is divided into a pressurizing chamber 4a and a compression chamber 4b. A diaphragm 4c is provided to partition the compression chamber 4b, and a gas such as nitrogen gas is sealed in the compression chamber 4b, and its internal pressure is maintained at around 4 kg/cm ² .

In such a water hammer absorber 3, when a faucet (not shown) attached to the discharge end of the water supply pipe 1 is abruptly shut off, a shock wave is propagated in the reverse flow direction within the water supply pipe 1. This shock wave reaches the diaphragm 4c via the pressure chamber 4a of the water hammer absorber 3, and bends the diaphragm 4c toward the pressure chamber 4b. By curving the diaphragm 4c in this manner, shock waves are absorbed and water hammer phenomenon is effectively prevented.

In such a conventional water hammer absorber 3, the diaphragm 4c is made of nitrile rubber, etc., and also serves as a gas leak prevention seal in the pressure chamber 4b, so perfect sealing performance cannot be expected. Also, since nitrile rubber itself has the property of permeating a small amount of nitrogen gas, it loses its function as a water hammer absorber after a relatively short period of about 6 months to 1 year, and each time, There was a problem in that nitrogen gas had to be replenished or the water hammer absorber 3 itself had to be replaced.

(Means for Solving the Problems) In order to improve the drawbacks of the conventional structure, the inventors of the present invention previously proposed a method that does not require replenishment of nitrogen gas, etc. We have devised a water hammer absorber with a new and durable structure, but because this structure adjusts the amount of water downstream of the ventilator, it is not possible to obtain a sufficient ventilator differential pressure. The purpose of this invention is to further improve this and provide a water hammer absorber with high water hammer absorption effect. A ventilate pipe section that has a minimum diameter section that has a small cross-sectional area and generates negative pressure through the flow of water or hot water, and is formed in a shape that gradually expands in diameter toward the downstream side, and an upstream side of the ventilate pipe section. a bypass passage that communicates with the downstream side; a pressure absorption chamber that is connected to the flow passage so as to communicate with the minimum diameter portion of the ventilary pipe portion; and an air passage that is provided in the pressure absorption chamber that communicates with the atmosphere. and a check valve that allows air to flow into the pressure absorption chamber only in one direction.

(Function) A flow path is formed in the water hammer absorber, and a ventilate pipe portion having a minimum diameter portion is provided within this flow path, and further communicates with the minimum diameter portion of this ventilee pipe portion. A pressure absorption chamber is formed connected to the flow path, and atmospheric air can be introduced into the pressure absorption chamber via a check valve. Therefore, when water or hot water flows in the flow path, the flow rate of the water or hot water increases at the minimum diameter portion of the ventilate tube portion, and negative pressure is generated at the minimum diameter portion. The negative pressure generated at this time causes atmospheric air to be sucked into the pressure absorption chamber via the check valve, and the pressure chamber is filled with air. If the discharge side is suddenly stopped in this state, a shock wave acts in the reverse flow direction, and the shock wave is propagated from the minimum diameter portion to the pressure chamber through the ventilate tube. Therefore, the shock wave presses the air in the pressure absorption chamber, and the shock wave is well absorbed in this pressure absorption chamber, and the water hammer phenomenon in the flow path is effectively prevented. In addition, in the present invention, since a bypass passage is provided that communicates the upstream side and the downstream side of the ventilate pipe section, a considerable amount of water or hot water is passed through this bypass passage, and the water or hot water flowing through this bypass passage is used. A sufficient amount of water or hot water can be discharged from the discharge side, and only the flow rate necessary and sufficient to generate a good negative pressure at the minimum diameter part needs to flow into the ventilate pipe. The pipe section fully demonstrates water hammer absorption function,
Moreover, a sufficient flow rate can be obtained through the bypass passage.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows a plan view of a mixing faucet equipped with the water hammer absorber of this example, FIG. B line sectional view,
FIG. 4 shows a sectional view taken along the line C--C in FIG. 2.

In the figure, a rotatable discharge pipe 7 is provided on the faucet body 6 of the hot water mixing faucet 5, and a lever 8 is provided on the top side for adjusting the discharge amount and discharge temperature.
is provided. Further, a water supply pipe and a hot water supply pipe (not shown) are connected to the faucet body 6, and water hammer absorbers X and Y of the present invention are connected and arranged between each pipe and the faucet body 6, respectively. .

In Figures 2 to 4, the internal structure of the water hammer absorber X on the water supply pipe side will be explained by taking it as an example. From the inlet 11a to the outlet 1
0a, the flow path WR is formed in an inclined L-shape, and the inlet portion 11a extends outward as shown in FIG. 4, and the external structure of the extended portion is shown in FIG. It serves as an inlet joint 11 for connecting to a water supply pipe (not shown). Moreover, the outlet 10a
is extended outward as shown in Fig. 3, and the external structure of this extended part is the faucet body 6 as shown in Fig. 1.
It serves as an outflow joint 10 for connecting to the outlet.

In addition, there is a cone-shaped ventilly tube 1 in the flow path WR.
2 is arranged, and this ventilly tube 12
is formed in a shape that gradually increases in diameter from the minimum diameter portion 12a toward the outflow port 10a side (downstream side), and also slightly expands in diameter toward the inflow port 11a side (upstream side). One or more water injection holes 13 are bored in the circumferential surface of the minimum diameter portion 12a. That is, when water passes through the ventilate tube 12, the flow velocity is increased at the minimum diameter portion 12a, and the minimum diameter portion 12a is set to have a negative pressure.
is integrally formed using corrosion-resistant metal materials such as stainless steel, brass, and other materials such as rubber and synthetic resin.

A water shutoff valve 17 is attached to the inlet 11a to adjust the flow rate and shut off water during maintenance. Furthermore, numeral 18 in the figure is a water-tight cap attached in a water-tight manner.

Further, the minimum diameter portion 12a of the ventilate tube 12
A pressure absorption chamber 14 is formed on the outer periphery of the
This pressure absorption chamber 14 has an air passage communicating with the atmosphere.
A dustproof cap 16 is attached to the open end of the air passage ER, and a check valve 15 is disposed inside the air passage ER. This check valve 15 is set so that air can flow into the pressure absorption chamber 14 only in the direction.

Further, in the water hammer absorber
A bypass passage RB is formed which directly communicates from 1a to the outlet 10a. Also, bypass passage RB
A throttle valve 19 is interposed in a watertight manner through an O-ring or the like on the outflow port 10a side of the water outlet 10a. Bypass passage upon selection
The amount of water flowing out from the RB to the outlet 10a side can be changed.

In the water hammer absorber X formed in this way,
When the water is in a non-flowing state, the pressure absorption chamber 14 is almost full of water, and when the lever 8 of the mixing faucet 5 is opened, water flows into the flow path WR, and the water flows out. When the flow rate increases through the minimum diameter section 12a when flowing to the ventilate pipe section 12, the internal pressure of the minimum diameter section 12a becomes a negative pressure state with respect to the internal pressure of the water supply pipe, and at that time, the water passes through the water injection hole 13 and enters the pressure absorption chamber 14. The filled water is introduced into the minimum diameter portion 12 and sucked out to the outlet 10a side. At this time, outside air is introduced into the pressure absorption chamber 14 via the check valve 15, and the pressure absorption chamber 14 is filled with air.

When the lever 8 is abruptly operated to stop the faucet in such a state, an impulse wave due to a sudden increase in pressure is propagated in the direction of reverse flow inside the faucet body 6, and the impulse wave is converted into a substantial flow of water. The pressure absorption chamber 14 is connected from the injection hole 13 of the minimum diameter part 12a of the ventilate tube 12.
flow inward. The incoming shock wave enters the pressure absorption chamber 14
The force is absorbed by the outside air filled inside, and the water hammer phenomenon is satisfactorily neutralized without causing any reflected waves against the shock waves.

If the lever 8 is then opened, the minimum diameter portion 12a will be in a flowing state again, and the pressure absorption chamber 14 will be filled with air again.
Prepared for absorption of the next shock wave.

In this example, since the bypass passage RB and the ventilate tube section 12 are provided in parallel in the flow path WR, sufficient negative pressure can be generated at the minimum diameter section 12a toward the ventilate tube section 12 side. It is sufficient to flow only the required amount of water, and the ventilate pipe section 12
can be formed into a small size.

In addition, Fig. 5 shows a relationship diagram between the amount of water discharged and the water supply pressure. Line A in the figure is the characteristic line without a water hammer absorber, and Line B in the figure is the characteristic line that was previously filed by the inventors. This is the characteristic line of the water hammer absorber according to Utility Model Application Publication No. 62-175920, and the line a in C in the figure is the characteristic line on the bypass passage RB side of the water hammer absorber of this example, and the line b in C in the figure is the characteristic line of the water hammer absorber in this example. This is a characteristic line in the ventilate pipe section 12 of the water hammer absorber, and c in the figure is the total water amount characteristic line of a in c and b in c.

As shown in the figure, in the past, the amount of water discharged increased due to the water supply pressure, and it was necessary to throttle the water discharge pipe side to adjust the appropriate amount of water discharged.Especially in B, the entire flow rate passed through the ventilate pipe. , when the discharge amount of the water discharge pipe section on the downstream side of the ventilate pipe section is adjusted and narrowed, sufficient negative pressure cannot be obtained in the minimum diameter section 12a due to the narrowing operation, so that the pressure absorption chamber is sufficiently filled with air. Therefore, when the discharge side was abruptly stopped, water hammer could not be absorbed well in the pressure absorption chamber 14. However, according to the present water hammer absorber, the bypass passage RB Both the flow rate flowing through the side and the flow rate flowing through the ventilate tube portion 12 side can be maintained within the appropriate water discharge amount range shown by the broken line, and the flow rate required to generate a good negative pressure in the minimum diameter portion 12a toward the ventilee tube 12 side. It is only necessary to flow a sufficient flow rate, and the ventilary pipe 12 side has a function of filling the pressure absorption chamber 14 with sufficient air for water hammer absorption, and the bypass passage RB side has a function of ensuring the amount of water discharged. Therefore, the total amount of discharge from the outlet 10a can be obtained as a flow rate as shown in c. Therefore, a sufficient flow rate can be secured on the discharge side, and the water hammer absorption function can also be fully exhibited.

Note that by appropriately selecting the diameter of the water passage hole 19a of the throttle valve 19 and replacing the throttle valve 19, the amount of water flowing through the Ipass passage RB side can be changed as appropriate.

Incidentally, the arrangement position of the ventilate tube 12 in the flow path WR can be changed as appropriate, and the arrangement position of the minimum diameter portion 12a can also be changed. Furthermore, the hole diameter and positioning of the water injection hole 13 formed in the minimum diameter portion 12a can be changed as appropriate.

In addition, although this example shows the case where the water hammer absorber is used in a mixer faucet, it can be used in the same way for a single faucet, and it can also be installed as appropriate in the liquid flow path to absorb water. It is possible to prevent the impact phenomenon.

(Effects of the invention) The water hammer absorber of the present invention has a minimum diameter part that is installed in a flow path, and the cross-sectional area of the flow path gradually decreases toward the downstream side, generating negative pressure by the flow of water or hot water. Further, a ventilate tube portion formed in a shape whose diameter gradually expands toward the downstream side, and a bypass passage communicating the upstream side and the downstream side of the ventilee tube portion,
A pressure absorption chamber connected to the flow path so as to communicate with the minimum diameter part of the ventilate pipe portion, and an air passage provided in the pressure absorption chamber communicating with the atmosphere, and air only directed into the pressure absorption chamber. By being equipped with a check valve that allows water to flow in, the ventilary tube side has the function of generating good negative pressure and filling the pressure absorption chamber with sufficient air to absorb water hammer. At the same time, since a good amount of water can be ensured on the bypass passage side, the water hammer absorption function and the function of ensuring the amount of water to be spouted can be effectively achieved.

[Brief explanation of drawings]

The figures show an embodiment of the present invention. Figure 1 is a plan configuration diagram of a water hammer absorber attached to a mixing faucet, and Figure 2 is a cross-sectional view of the water hammer absorber taken along A-A in Figure 1. Line sectional view, Figure 3 is a BB line sectional view of Figure 2, Figure 4
The figure is a sectional view taken along the line C--C in FIG. 2, FIG. 5 is a relational diagram showing the relationship between the amount of water discharged and the water supply pressure, and FIG. 6 is a sectional view showing the structure of a conventional water hammer absorber. 7...Discharge pipe, 8...Lever, 10...Outflow joint, 11a...Inflow port, 12...Venture pipe, 12a...Minimum diameter section, 13...Water injection hole, 14
... Pressure absorption chamber, 15 ... Check valve, 19 ... Throttle valve, 19a ... Water hole, X, Y ... Water hammer absorber,
WR...Flow path, ER...Air passage, RB...Bypass passage.

Claims (1)

[Scope of utility model registration request] Provided within the flow path, the cross-sectional area of the flow path gradually decreases toward the downstream side, and has a minimum diameter section that generates negative pressure due to the flow of water or hot water, and is formed in a shape that gradually expands toward the downstream side. a bypass passage that communicates between the upstream side and the downstream side of the ventuille tube section; a pressure absorption chamber connected to the flow path so as to communicate with the minimum diameter part of the ventuille tube section; A water hammer absorber comprising: a check valve provided in an air passage communicating with the atmosphere of a pressure absorption chamber, and allowing air to flow into the pressure absorption chamber only in the direction toward the pressure absorption chamber.