KR20000019531U - water hammer arrester - Google Patents

Abstract

The present invention discloses a water hammer of the novel configuration.

For the convenience of manufacturing and installation of the water hammer, the water hammer is designed to install a flange ring rotatably around the neck, and to connect the flange ring to the flange of the joint to install the water hammer. Simplifies manufacturing and installation costs.

Description

Water hammer arrester

The present invention relates to a water hammer preventer to prevent noise and vibration caused by water hammer in a pipe line.

If the flow resistance changes during the flow of the fluid, the pressure of the fluid changes. In the case of a gas, which is a compressible fluid, the change in flow resistance is merely a change in pressure, but in the case of an incompressible fluid, the head itself changes. For example, the flow of liquid entering a narrow flow passage from a wide flow passage increases its head, ie the liquid level, which is generally referred to as a "hydraulic jump" phenomenon.

In the case where the liquid is supplied in a limited cross section such as a pipe, the problem of the change of the flow path resistance becomes more serious. For example, in the case of a water pipe, when a valve is blocked during the flow of water, a large shock wave is generated because a large shock wave is generated because water, which is an incompressible fluid, cannot absorb a sudden change in flow path resistance. The occurrence of shock waves in the liquid pipe is called water hammer in particular. This water hammer problem is somewhat less for rotary valves where the valve is slowly opened with screws, but for the sake of ease of use in recent years, it has become more serious as the rotary valve is switched to a one-touch valve. In addition, damage to piping, valves, or pumps can occur. In addition, the flow of liquid in the confined pipeline causes the liquid to boil rapidly due to the pressure drop when the valve and the like are rapidly opened, thereby generating bubbles in the liquid and causing cavitation.

In order to prevent such manual phenomenon, a water hammer as shown in FIG. 1 is generally used.

In FIG. 1, the body B of the water hammer preventer W 'connected to the pipe P has an diaphragm D made of elastic material such as rubber supported between the upper and lower bodies B1 and B2. A kind of pressure chamber is provided by injecting a gas such as air or an inert gas, which is a compressive fluid, into a space between the upper body B1 and the diaphragm D through a nipple N provided above (B). Will form.

Such a water hammer prevents the shock wave generated by the valve V being cut off rapidly while the liquid flows in the pipe P, and the diaphragm D is compressed in a dotted line to prevent the occurrence of water hammer. .

That is, the compressor body of the pressure chamber formed between the upper body B1 and the diaphragm D buffers the pressure change in the pipe P to prevent noise and vibration, and prevents the pipe P, the valve V, or the like. To prevent damage to the pump.

However, such a conventional water hammer preventer (W ') is limited to the area of the diaphragm (D) in which the pressure change is transmitted to the diameter of the body (B) is not possible to quickly absorb a large shock wave to prevent water hammer There was not a big problem. In addition, both the formation of the airbag and the absorption of shock waves depend only on the diaphragm D. Since the outer end of the diaphragm is always supported between the upper and lower bodies B1 and B2 in a high tension state, the upper and lower bodies B1 and B2 There is a problem that the service life of the diaphragm (D) is very difficult and the diaphragm (D) is easily aged and deteriorated due to fatigue, thereby failing to achieve proper function.

On the other hand, in the conventional water hammer (W '), foreign matter generated in the pipe (P) flows into the body (B) as it is and precipitates therein, thereby preventing the operation of the water hammer (W'), which further extends its service life. There was also a problem of shortening.

Accordingly, the applicant has devised a water hammer preventive device as shown in Figure 2 and filed as Utility Model Registration No. 94-29737.

In FIG. 2, the body B of the water hammer preventer W connected to one side of the pipe P is provided with an air bag A having a closed curved surface in the form of a sphere or a blade. It is supported by the nipple (N) of the at the same time through the gas of a predetermined pressure is filled.

The water hammer (W) having such a configuration has a much larger pressure transfer area than the water hammer of FIG. 1 and changes its elasticity as well as its own shape and absorbs shock waves from the pipe (P). And effective water hammering prevention effect.

However, since the airbag A is supported only by the nipples N, the water stopper W having such a configuration is important to seal the coupling portion with the nipples N. This coupling portion is likely to deteriorate, and the compressor body leaks during long-term use. There is a concern.

1 and 2, the diaphragm D or the airbag A is subjected to a constant back pressure by the compressed gas. However, the shock absorbing force provided by the compressor body is inversely proportional to the total volume of the compressor body, that is, the volume of the pressure chamber, by Boyle's law. Accordingly, when the volume of the pressure chamber is large, the shock absorbing power is high, but when the volume is small, the shock absorbing power is small. Therefore, when the pressure in the pipe P is severe due to pulsation or frequent opening and closing of the pipe, the shock absorption effect is not constant, and the fluid in the pipe P, such as the low-rise pipe of a building with a water tank on a high floor, is not constant. If the head is high, the diaphragm (D) or the airbag (A) is excessively pressed into the contracted state of the pressure chamber, so that the proper water hammering prevention function cannot be exhibited.

In addition, in the conventional water hammer preventers W and W ', the surface area of the interface between the fluid and the compressor body, that is, the interface of the pressure chamber, expands and contracts according to the shock absorption. That is, since the diaphragm (D) or the airbag (A) itself repeats expansion and contraction, its own material must be composed of high elasticity, durability, toughness and a very stable and expensive material. For this reason, periodic checks and replacements are required.

In addition, the conventional water hammer (W, W ') lacks the function of giving and absorbing shock waves and returning the fluid to the pipe (P), and when a large shock wave is generated, the continuity in the pipe (P) of the incompressible fluid is broken. There also existed a problem of causing stress or corrosion in piping P by inducing local boiling or deformation force.

Accordingly, the cause is filed with the same concept by designing a water hammer preventer having a configuration as shown in FIG.

In Fig. 5, the water hammer according to the present invention is formed in a substantially cylindrical shape, and a body 1 having a compressor body filled therein to form a pressure chamber C, and preferably a hemisphere to seal one end thereof. A head 2 and a neck 3 which is smaller in diameter than the body 1 and connected to a pipe P (not shown in FIG. 5), and is inclined between the end of the body 1 and the neck 3. As shown in FIG. 4, the shrinkage ratio 4 is gradually reduced.

Inside the pressure chamber C of the body 1 is preferably a piston 5 having a U-shaped cross section, which is opposite to the head 2 by the pressure of the compressor body in the pressure chamber C of the piston 5. Is elastically biased and caught by the shoulder 4 to prevent deviation from the body 1.

On the other hand, a plurality of limiting jaws 5a are preferably formed on the outer circumference of the piston 5 so that one or a plurality of O-rings 6 are installed to prevent leakage of the compressor body from the pressure chamber C.

On the other hand, on the neck 3 side, an appropriate connector such as a screw tube 7 is coupled to the pipe line of the pipe P by brazing bonding or the like.

As a result, the completed water hammer prevents the spring (25 of FIG. 3) from being stored inside and does not need to be combined with the cap (27 of FIG. 3). Thus, the structure of the water hammer is made of a corrosion-resistant metal. When the piston 5 is made of a corrosion-resistant metal or a synthetic resin, there is no fatigue or corrosion and thus semi-permanent use is possible.

The core of the present invention is to produce a body 1 of such a simple configuration in any way, it can be said that it depends on whether to accommodate the compressor body and the piston (5).

Such a water hammer is coupled to the pipe (P) in the same manner as in FIG. In FIG. 6, a T joint (T ') is connected to the middle of the pipe P for coupling the water hammer, and the water hammer is connected to the threaded portion S of the branch pipe R of the T joint T'. The screw portion 7a of the screw tube 7 joined to the neck 3 of the protector is engaged.

However, in order to use such a screw coupling method, since the body 1 of the water hammer is to be rotated, a nut part 7b for torque transmission must be provided in the screw tube 7, As manufacturing becomes more complicated, the cost increases.

In addition, since the T joint (T ') is commercially available as a standard product, the T joint (T') having a branch pipe (R) having a threaded portion (S) has a small number of kinds, and a general flange part (T). It is quite expensive compared to the joint (see FIG. 9). As a result, the diameter of the screw tube 7, that is, the diameter of the neck 3, must be limited to the available T joint T ', thereby providing a water hammer of appropriate capacity for the pipe P of various facility capacities. It is becoming a big obstacle.

In view of such a conventional problem, an object of the present invention is to provide a water hammer which is simpler in structure and easy to manufacture, and can be coupled to a general joint by a general pipe coupling method.

1 is a cross-sectional view showing the configuration of a conventional water hammer.

2 to 4 is a cross-sectional view showing the configuration of the applicant's first application water hammer,

Figure 5 is a cross-sectional view showing the configuration of the same application water hammer prevention device as the subject of the present invention,

Figure 6 is an exploded side view showing the pipe connection of the water hammer of Figure 5,

7 is a cross-sectional view showing the configuration of a water hammer according to the present invention,

8 (A) to (C) is a sequential cross-sectional view showing a manufacturing process of the water hammer of the present invention,

Figure 9 is an exploded side view showing the pipe heat of the water hammer according to the present invention.

<Description of the code | symbol about the principal part of drawing>

1: body (water hammer) 3: neck

3a: limit flange 8: flange ring

8a: bolt hole 8b: recess

In order to achieve the above object, the water hammer according to the present invention rotatably couples a flange ring that can be coupled to the flange of the joint at the neck,

It extends in the radial direction at the bottom of the neck is characterized in that for forming a limiting flange to prevent the departure of the flange ring.

According to this configuration, the coupling between the flange ring and the flange of the general joint by bolt and nut coupling, so that the limiting flange of the water hammer is supported between the two, so that the water hammer can be easily coupled.

As a result, the construction of the water hammer is simplified, and the manufacturing is easy, and the installation cost can be reduced because the inexpensive and general flange joint can be used.

Such specific features and advantages of the present invention will become more apparent from the following description of the preferred embodiments with reference to the accompanying drawings.

(Example)

In FIG. 7, the internal configuration of the water hammer of the present invention is the same as the water hammer of the same as the water hammer of FIG. 5 is a pressure chamber (C) is filled with a pressure gas inside the body (1) formed with a hemisphere head (2) on one side The piston 5 is elastically biased toward the neck 3 side, and the separation of the piston 5 is restricted by the shoulder 4 between the neck 3 and the body 1.

Here, the shape of the piston 5 is slightly different from the configuration of FIG. 5, but this is a difference depending on the melt of the water hammer, and a limiting jaw 5a is formed on the outer circumference thereof to couple the O-ring 6 to the pressure chamber C. FIG. ), And performs the same function of sealing the pressure fluctuations in the pipe P delivered to the neck 3 by the pressure gas in the pressure chamber C.

According to the features of the present invention, a flange ring 8 is rotatably provided at the outer circumference of the neck 3, and a limiting flange 3a is formed at the lower end of the neck 3 in the circumferential direction to remove the flange ring 8. Will be prevented.

Here, the flange ring 8 is formed with a bolt hole 8a corresponding to the flange F (see FIG. 9) of the T joint T on the pipe P to be coupled thereto, preferably the limiting flange 3a. The inlet groove 8b corresponding to) is formed.

8 shows one preferred method of constructing such a water hammer.

In FIG. 8A, the water hammer is not provided with the screw tube 7 in the water hammer of FIG. 5. The flange ring 8 is inserted into the neck 3 of the water hammer in this state.

Next, in FIG. 8 (B), when the front end of the neck 3 is extended by an appropriate forming die D, a limiting flange 3a that extends in the radial direction is formed. Becomes In this state, the flange ring 8 is rotatable around the neck 3 with the restriction flange 3b inserted into the inlet groove 8b of the flange ring 8.

Figure 9 shows the process of installing such a water hammer preventer in the pipe (P).

In the middle of the pipe (P) is installed a T joint (T) for the installation of a water hammer. Unlike the T joint (T ') of Figure 6, the T joint (T) is installed in all three connections in the flange (F) Has a general configuration.

Here, the water hammer can be installed at the end as well as the middle of the pipe (T), T joint (T) means all joints to which the water hammer is to be coupled.

Then, the water hammer of the present invention is brought into contact with the flange (F) of the T joint (T) and the flange is fitted so that the bolt hole (8a) of the flange ring (8) fits into the bolt hole of the flange (F) of the T joint (T). Rotating the ring (8), and then through the bolt (B) to fasten with the nut (N) to complete the coupling of the water hammer. An appropriate gasket 9 can be provided between the flange ring 8 and the flange F for watertightness.

Thus, the present invention can use the T joint (T) of the general configuration, the installation cost is lowered, and there is no limit to the size of the neck (3) according to the change in the capacity of the pipe (P), the optimal water hammer prevention design It becomes possible.

In addition, the construction of the water hammer preventer itself is simplified, and the use and joining of the screw tube 7 having the nut portion 7b and the screw portion 7a are unnecessary, thereby greatly reducing the manufacturing cost.

Therefore, the present invention is easy to install, and there is an effect of providing a water hammer prevention device with low installation and manufacturing cost.

Claims (2)

In the water hammer preventing body having a body which has a sealed head on one side of the body, the pressure gas is filled therein and the piston is stored therein, and the neck and shoulder are formed on the other side, The neck (3) rotatably couples the flange ring (8) which can be coupled to the flange (F) of the joint (T) to be installed water hammer, Water hammer preventive, characterized in that extending to the lower end of the neck (3) in the radial direction to form a limiting flange (3a) to prevent the departure of the flange ring (8). The method of claim 1, Water hammer preventer, characterized in that the inlet groove (8b) is formed in the lower portion of the flange ring (8) to enter the limiting flange (3a).