JPH0515661Y2 - - Google Patents

Description

[Detailed explanation of the invention] "Purpose of the invention" (Field of industrial application) This invention aims to solve the problem of water hammer phenomenon (also called water hammer phenomenon) that can occur in water supply pipes or hot water supply pipes, etc.
absorb. This invention relates to a water hammer absorber for a hot and cold water mixing faucet.

(Conventional Water Hammer Absorber) Fig. 3 shows a conventional water hammer absorber 3 to be installed in a water supply pipe 1 (or hot water supply pipe) etc. piped behind a building wall (not shown). FIG.
The water hammer absorber 3 includes a spherical case 4 connected to a cheese 2 interposed in a water supply pipe 1. Inside the spherical case 4, there are a pressurizing chamber 4a and a compression chamber 4b.
A diaphragm 4c was provided to divide the space into two parts. A gas such as nitrogen gas was sealed in the compression chamber 4b, and its internal pressure was maintained at around 4 kg/cm ² .

Now, assume that a faucet (not shown) attached to the discharge end of the water supply pipe 1 is suddenly stopped, and a shock wave is propagated in the reverse flow direction within the water supply pipe 1. The shock wave reaches the diaphragm 4c via the pressure chamber 4a of the water hammer absorber 3, and causes the diaphragm 4c to curve toward the compression chamber 4b. For this reason,
The shock waves are absorbed and no water hammer phenomenon occurs.

(Problems to be Solved by the Invention) The conventional water hammer absorber 3 is large in size, and it is impossible to attach it later to a water supply pipe 1 or the like installed behind a wall. Therefore, it was considered to attach the water hammer absorber 3 to the connection part of the water supply pipe 1 to a faucet, a hot water mixing faucet, etc. (not shown), which protrudes from the wall of the building, but the appearance was extremely poor. And it was almost never done. Moreover, the conventional water hammer absorber 3 has the following drawbacks. That is, the diaphragm 4c is made of nitrile rubber or the like, and also serves as a gas seal for preventing gas leakage in the compression chamber 4b. However, a perfect seal could not be expected, and nitrile rubber itself permeated a small amount of nitrogen gas, so it was used as a water hammer absorber in a relatively short period of about 6 months to 1 year. It was becoming impossible to obtain sufficient functionality. Therefore, you can replenish the gas each time,
Alternatively, the water hammer absorber 3 itself must be replaced, resulting in an increase in running costs.

The present invention was developed in view of the above-mentioned circumstances, and can be installed at the connection between a water supply pipe or a hot water supply pipe protruding from a building wall and a hot water mixing faucet, etc., and is a nitrogen gas replenishment system. All disadvantages such as work, replacement of the water hammer absorber itself, and rising running costs can be eliminated. The purpose of the present invention is to provide a new water hammer absorber (hereinafter referred to as the "proposed absorber") for a hot and cold water mixing faucet.

``Structure of the invention'' (Means for solving problems) The gist of the absorber of the present invention is that it is a water hammer absorber that is attached to a hot and cold water mixing faucet, and is a water hammer absorber installed in a water supply pipe or the like installed on the wall of a building. It has an inflow joint connected to the hot water supply pipe and an outflow joint connected to the faucet main body, a small diameter pipe part is provided in the water channel that communicates between the two joints, and an injection channel is provided around the circumference of the small diameter pipe part. A pressure absorption chamber is formed through the pressure absorption chamber, and a check valve exclusively for intake is connected to the pressure absorption chamber.

(Function) If the inflow joint is connected to a water supply pipe or hot water supply pipe installed on a building wall, etc., and the outflow joint is connected to the faucet body of a hot and cold water mixing faucet, the appearance of the proposed absorber is as follows. It is difficult to distinguish it from the mounting legs normally provided on hot and cold water mixing faucets. Therefore, it does not cause any discomfort to the viewer.

Now, suppose that a shock wave due to a sudden increase in pressure is propagated in the reverse flow direction within the faucet body by suddenly turning off a hot water/cold water mixing faucet that is in a spouting state. When water was flowing inside the faucet body, the pressure absorption chamber of the absorber of the present invention was filled with air that had flowed in through the intake-only check valve, or a lump of air had formed. ing. Therefore, the shock wave that reaches the small diameter pipe portion of the absorber of the present invention becomes a substantial flow of water and flows into the pressure absorption chamber through the injection channel. Therefore, the shock wave is absorbed by compressing the air, and no reflected wave is generated. Therefore, the water hammer phenomenon is eliminated.

(Example) The present invention will be described below based on drawings showing examples thereof.

FIG. 1 is a plan view showing a hot water mixing faucet 5 equipped with an original absorber for a water supply pipe (arrow mark X) and an original absorber for a hot water supply pipe (arrow Y). In addition, in the hot water mixing faucet 5, reference numeral 6 is a faucet main body, reference numeral 7 is a discharge pipe, and reference numeral 8 is a lever for adjusting the discharge amount and discharge temperature.

FIG. 2 is a front sectional view showing the proposed absorber for water supply pipes, taken along line A--A in FIG. 1. The absorber of the present invention is like a rectangular box tilted diagonally, and the inside thereof has a lower inlet port 11a.
An inclined L-shaped flow path is formed extending from the outlet portion 10a to the upper outlet portion 10a. The inflow port 11a extends toward the back of the drawing,
The external structure of the extended portion is as shown in Figure 1.
It serves as an inlet joint 11 for connecting to a water supply pipe (not shown). Further, the outlet portion 10a
is extended towards the front side in Figure 2,
The external structure of the extended portion is as shown in Figure 1.
It serves as an outflow joint 10 for connection to a faucet main body 6. As shown in FIG. 2, both the joints 11,
The waterway formed between the sections 10 is tapered on both upper and lower sides so that the lower end of the web is narrowest in the L-shape. This narrowest part is the small diameter tube part 12. The small-diameter tube portion 12 is provided with one or more hole-shaped injection channels 13 that penetrate laterally inside and outside the tube portion 12 . In this embodiment, the tapered portions on both sides are integrally formed with the small diameter tube portion 12 interposed in the center. This integrally formed part is made of stainless steel, brass,
It is made of corrosion-resistant metal materials such as brass, as well as rubber, synthetic resin materials, etc. Although not shown, a water stop valve (see arrow 17 in FIG. 1) is attached to the inlet port 11a to adjust the flow rate and to stop water during maintenance.

A pressure absorption chamber 1 is provided on the outer periphery of the small diameter tube portion 12.
4 is formed. The pressure absorption chamber 14 bulges diagonally upward from the small-diameter tube portion 12 and is formed into a box shape, and a check valve 15 exclusively for intake is attached to the top of this box-shaped portion. Further, a dustproof cap 16 is attached to the upper part of the check valve 15.

The operation of the absorber of the present invention will be explained based on FIG. The absorber of the present invention is installed so that water flows in the direction of the outlined arrow. When the small diameter tube portion 12 of the absorber of the present invention is in a non-flowing state, the inside of the pressure absorption chamber 14 is substantially full of water. Open the lever 8 (see Figure 1) of the hot water mixing faucet 5,
It is assumed that water is flowing inside the small diameter tube portion 12. At this time, the internal pressure of the small diameter pipe portion 12 in the absorber of the present invention is in a (negative) state with respect to the internal pressure of the water supply pipe. Therefore, the water filling the pressure absorption chamber 14 passes through the injection channel 13 of the small diameter pipe section 12 and reaches the outlet section 10a.
It feels like it's being sucked out. At the same time, outside air is sucked into the pressure absorption chamber 14 via the check valve 15. In this way, the pressure absorption chamber 1
4 becomes filled with air.

Now, assume that the lever 8 is suddenly operated to stop the faucet, and a shock wave due to a sudden increase in pressure is propagated in the reverse flow direction within the faucet body 6. The shock wave becomes a substantial flow of water and flows from the injection channel 13 into the pressure absorption chamber 14 . Therefore, the force of the shock wave is absorbed, and no reflected wave is generated with respect to the shock wave. Therefore, the water hammer phenomenon is eliminated. Furthermore, when the lever 8 is opened next, the small diameter tube portion 12 of the absorber of the present invention is opened.
Since the water becomes flowing again, the inside of the pressure absorption chamber 14 is again filled with air and becomes ready for absorption of the next shock wave.

(Study of another aspect) The positioning of the small-diameter pipe section 12 provided in the flow path of the absorber of the present invention, the number of holes, the hole diameter, and the positioning of the injection channel 13 bored in the small-diameter pipe section 12 are also determined by the supply pressure of water or hot water. It can be changed as appropriate depending on the situation. In this way, the configuration and shape of the absorber of the present invention can be changed as appropriate depending on the embodiment.

"Effects of the invention" As is clear from the above explanation, the water hammer absorber for hot and cold water mixing faucets according to the present invention is difficult to distinguish from the mounting legs normally provided on hot and cold water mixing faucets; , it is not inferior. Of course, it can also be attached to an existing hot and cold water mixing faucet, and if necessary, it can be attached only to the water supply pipe side, or conversely, only to the hot water supply pipe side. In addition, the proposed absorber does not have a structure that constantly stores special gas such as nitrogen gas, so there is no need to worry about gas leaks, and there is no need to replenish gas or replace the water hammer absorber itself due to gas leaks. Become. Furthermore, since there are no mechanically moving parts except for attached parts such as check valves, there is almost no risk of failure. In other words, the absorber of the present invention can be used semi-permanently and has no running costs.

The conventional water hammer absorber compresses the nitrogen gas filled in the compression chamber to ensure an inflow space for water or hot water and absorb shock waves. Therefore, a large pressure receiving area (diaphragm area) is required to absorb shock waves,
Furthermore, it was necessary to ensure a sufficient compression volume for nitrogen gas in the compression chamber. Therefore, it was quite large. In contrast, the proposed absorber absorbs shock waves by mixing the air inside the pressure absorption chamber with water or hot water, so the space inside the pressure absorption chamber can be used effectively against shock waves. Therefore, miniaturization is possible. Furthermore, since the shock wave is absorbed as a substantial flow of water or hot water into the pressure absorption chamber, it has many excellent advantages, such as increasing the absorbable pressure.

[Brief explanation of the drawing]

Figure 1 is a plan view showing a hot water mixing faucet equipped with the absorber of the present invention, Figure 2 is a front cross-sectional view of the absorber of the present invention (cross-sectional view taken along the line A-A in Figure 1), and Figure 3 is a plan view of a water mixing faucet equipped with the absorber of the present invention. It is a side sectional view showing a shock absorber. 5... Hot water mixing faucet, 6... Faucet body, 10...
... Outflow joint, 11 ... Inflow joint, 12 ... Small diameter pipe section, 13 ... Injection channel, 14 ... Pressure absorption chamber,
15...Check valve.

Claims (1)

[Scope of utility model registration request] A water hammer absorber that is attached to a hot and cold water mixing faucet, and includes an inlet joint that is connected to a water supply pipe or hot water supply pipe installed on a building wall, etc., and an outflow joint that is connected to the faucet body, and both joints A small-diameter pipe portion is provided in the waterway that communicates with the two, a pressure absorption chamber is formed around the small-diameter pipe portion via an injection channel, and a check valve exclusively for intake is connected to the pressure absorption chamber. A water hammer absorber for a hot and cold water mixing faucet.