JPH022128Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention relates to a water hammer prevention device.
In particular, the present invention relates to a water hammer prevention device that is suitable for use in piping systems such as water pipes and is generated by generating negative pressure.

"Prior Art" In general, in piping systems such as water pipes, the pressure inside the water pipe fluctuates rapidly due to the sudden closing of a valve installed in the middle of the pipe, the stoppage of a water pump, etc. Pressure transients occur, a notable example of which is water hammer. especially,
Water hammer when negative pressure is generated can cause water column separation within the water pipe and an abnormal pressure rise when the water column recombines, leading to accidents such as bursting or crushing of the water pipe, or destruction of the valve body. Countermeasures are required.

Conventionally, a T-shaped pipe or the like is inserted in the middle of the water pipe, and a pressure regulating means such as a surge tank, air chamber, or safety valve is attached to the T-shaped pipe, so that when the water hammer described above occurs, The pressure regulating means removes a portion of the water in the water pipe when the pressure increases, and supplies water into the water pipe when the pressure drops, thereby preventing water hammer.

"Problems to be Solved by the Invention" The present invention is intended to solve the following problems of the prior art described above.

In other words, in the conventional technology described above, in order to attach the pressure regulating means, it is necessary to cut the water pipe short or replace it with a shorter water pipe and insert a T-shaped pipe in that part, which requires a lot of effort. This is time consuming, and the use of T-shaped pipes increases the number of connecting parts such as flanges, which is undesirable in terms of water leakage prevention.

The present invention is easy to install on water pipes, does not require an increase in the number of connecting parts, and is preferable from a water leakage countermeasure. It is an object of the present invention to provide a piping system water hammer prevention device that can be controlled.

"Means for Solving the Problems" In order to achieve the above object, the present invention provides a valve body having flanges at both ends of the water passageway, and a valve body for opening and closing the water passageway. A water flow pipe is provided between at least one of the flanges to communicate with the water flow path and is integrally formed with the valve box, and the water flow pipe is provided with a pressure adjustment means for absorbing water hammer in the water flow path. It is something.

"Operation" To install a water hammer prevention device on a water pipe, remove the existing valve from the water pipe and attach the water hammer prevention device according to the present invention to that part using the flange of the valve box.

When the valve body is moved to close the valve box, the water that was previously flowing through the water channel stops flowing. At this time, immediately after the valve body is closed, pressure increases on the upstream side of the valve body and decreases on the downstream side due to inertial movement of water flowing through the water passage. The faster the water flows and the more rapidly the valve body is blocked, the more the pressure of the water increases and decreases, resulting in a so-called water hammer, which causes the various problems mentioned above. In the water hammer prevention device of the present invention, the pressure regulating means works to prevent the water hammer described above.

In addition, when closing the valve body, it quickly senses from the operating sound and vibration of the pressure regulating means that the valve body is being operated too quickly, and reduces the subsequent closing speed of the valve body to prevent large amounts of water. Hammers can be prevented.

"Embodiment" A preferred embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, reference numeral 1 indicates a water hammer prevention device according to this embodiment.

The water hammer prevention device 1 includes a valve box 3a of a valve 3 provided in the middle of a water pipe 2, and a water pipe 5 that communicates with a water passage 4 inside the water pipe 5. The general structure includes a pressure adjusting means 6 for absorbing a sudden pressure drop within the pressure chamber 4.

Next, to explain these details, the valve 3 is installed in the middle of the water pipe 2 via a flange 3b, and the side wall of the valve box 3a is inserted between the downstream flange 3b and the valve body 3c. The water pipe 5 is integrally provided therethrough.

The water pipe 5 opens into the water passage 4 near the valve body 3c inside the valve box 3a. Further, a flange 7 is provided at the outer end of the water pipe 5, and the pressure adjusting means 6 is integrally provided via the flange 7.

In this embodiment, the pressure adjusting means 6 is connected to the water pipe 2.
A check valve 8 attached to the flange 7 and the check valve 8 and a surge tank 9 connected to the surge tank 9.

When the check valve 8 is in a normal water supply state, it is closed by the pressure inside the water pipe 2 to enable water supply, and when the pressure drops due to a transient phenomenon, it is opened and the water pipe 2 is opened. and the surge tank 9 are in communication with each other. Further, the surge tank 9 stores auxiliary water in an amount that can prevent the negative pressure described above.

The auxiliary water is stored in the surge tank 9 using a bypass circuit B provided with a manual valve A when the water pipe 2 is filled with water. Further, when the surge tank 9 is a closed type, it is necessary to provide an air valve C in the surge tank 9.

The water hammer prevention device 1 of this embodiment configured as described above can be used when the valve body 3c is closed to stop the water supply flowing from left to right in FIG. It operates when the pressure inside the water pipe 2 drops, such as when water is started to be fed from right to left in Figure 1. That is, due to the pressure drop mentioned above, the force that had been pushing the check valve 8 upward is reversed, and the check valve 8 is thereby opened as shown by the chain line in FIG. By supplying auxiliary water in the surge tank 9 to the water pipe 2, generation of negative pressure in the water pipe 2 is prevented.

In addition, when the water supply is restarted, the check valve 8 is closed as the pressure inside the water pipe 2 increases, thereby cutting off communication between the surge tank 9 and the water pipe 2. , restore the piping system to a state where water can be supplied.

On the other hand, FIG. 2 shows another embodiment of the present invention, in which a water pipe 10 similar to the water pipe 5 in the previous embodiment is provided on the upstream side of the valve box 3a, and another pressure is applied to the water pipe 10. Adjustment means 11 is provided in series.

Pressure adjustment means 1 newly provided in this embodiment
1 is provided to suppress the pressure increase in the water pipe 2 when a transient phenomenon occurs, and the water pipe 1
0 through a flange 12 at its outer end.

For example, when a transient phenomenon occurs due to rapid closing of the valve 3, and a sudden pressure rise occurs on the upstream side of the valve 3, the pressure regulating means 11 controls the water pressure in the vicinity of the valve body 3c. By guiding the air into the air chamber 13 and compressing the air within the air chamber 13, the energy of the transient phenomenon is absorbed and pressure rise is suppressed.

Such a pressure increase suppression effect is achieved by guiding water near the valve body 3c into the air chamber 13, so that no abnormal pressure acts on the valve body 3c or the like.

On the other hand, the pressure regulating means 11 of this embodiment operates effectively even when the pressure inside the water pipe 2 increases other than when the valve 3 is closed.

Note that the structures of the pressure regulating means 6 and 11 shown in the above embodiments are merely examples, and can be modified in various ways based on design requirements and the like. In addition, water pipes 5 and 1
0 and the pressure adjusting means 6, 11 by interposing an auxiliary pipe or the like as necessary.
can also be installed at a desired location.

"Effects of the Invention" As explained above, the piping system water hammer prevention device according to the present invention is provided with a valve body that opens and closes the water passage in a valve box having flanges at both ends of the water passage, and the valve body and at least one of the flanges, a water flow pipe is provided integrally with the valve box and communicates with the water flow channel, and the water flow pipe is provided with pressure regulating means for absorbing water hammer in the water flow channel. Therefore, the existing valve can be removed from the water pipe and the water pipe according to the present invention can be installed in that part without cutting the water pipe short or replacing it with a shorter water pipe and installing a T-shaped pipe in that part. A hammer prevention device can be easily installed using a flange of a valve box without increasing the number of connecting parts. Therefore, according to the present invention, the water hammer prevention device can be installed easily and quickly, and there is an advantage that no special measures against water leakage are required.

In addition, since the pressure adjustment means is provided immediately near the valve body, when opening and closing the valve body, the suitability of the valve body operation at that time can be quickly determined from the operating sound and vibration of the pressure adjustment means, and the subsequent By controlling the operation of the valve body, large water hammer can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view showing one embodiment of the present invention, and FIG. 2 is a partially sectional front view showing another embodiment of the present invention. 1...Water hammer prevention device, 2...Water pipe, 3...Valve, 3a...Valve box, 4...Water passage,
5, 10... Water pipe, 6, 11... Pressure adjustment means, 7, 12... Flange, 8... Check valve, 9...
...Surge tank, 13...Air chamber.

Claims (1)

[Scope of utility model registration request] A valve body 3c for opening and closing the water passage 4 is provided in a valve box 3a having flanges 3b, 3b at both ends of the water passage 4, and the water passage pipe 5 is connected between the valve body 3c and at least one of the flanges 3b. Prevention of water hammer in a piping system, characterized in that the water passage pipe 5 is provided with a pressure regulating means 6 that communicates with the water passage 4 and is provided integrally with the valve box 3a, and that absorbs water hammer in the water passage 4. Device.