KR200322672Y1 - Water Hammer Arrester - Google Patents

Abstract

The present invention is a water hammer prevention device connected to the pipe to cushion the water hammer phenomenon occurring in the pipe, a body (head) having a closed head (head) on one side and a predetermined compressor body is filled therein, and is housed in the body The piston is elastically biased to the opposite side of the head by the pressure gas, the neck is formed on the opposite side of the body to the shaft, and the neck and the body are connected to separate the piston. A water hammer preventive, characterized in that the shoulder (shoulder), the beading (beading) formed on the open end of the neck, and the adapter to be coupled to the pipe connected to the neck, characterized in that the adapter of the water hammer When connecting the connection device, there is an effect that can prevent the contamination of the contaminants due to brazing, soldering or welding into the pipe line.

Description

Water Hammer Arrester}

The present invention relates to a water hammer to buffer the water hammer in the pipeline, and more particularly to a water hammer to increase the airtightness by installing an O-ring in the connection port coupled with the neck of the water hammer.

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

The water hammer phenomenon occurs when the water flow flowing in the state filled with the pipe is suddenly blocked by a valve, and a hydraulic jump occurs due to the rapid rise of the water pressure, which causes the water hammer to reciprocate in the pipe and generate noise and vibration. The noise and vibration generated as described above are transmitted to the surrounding structure through the pipe, which adversely affects the pipe structure and the system.

In the case where liquid is supplied into 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 the rotary valve which is slowly opened with screws, but is becoming more serious as the rotary valve is converted to a one-touch valve for convenience of use recently. This can cause damage to pipes, valves or pumps. In addition to the flow of the liquid in the limited conduit, if the valve is rapidly opened, the liquid is rapidly boiled by the pressure drop to generate bubbles in the liquid and cause cavitation (cavitation).

In order to prevent such phenomena from occurring, a water hammer as shown in FIG. 1 is generally used.

In FIG. 1 according to the prior art, the body B of the water hammer preventer W 'connected to the pipe P is provided with an elastic diaphragm D such as rubber supported between the upper and lower bodies B1 and B2. By injecting a gas such as air or an inert gas into the space between the upper body (B1) and the diaphragm (D) through a nipple (Nipple) installed on the upper side of the body (B) at a predetermined pressure, a kind of pressure chamber ( pressure chamber).

Such a water hammer prevents the shock wave in the pipe (P) in the diaphragm (D) is compressed in a dotted line state to prevent the occurrence of water hammer phenomenon. 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 (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 is not long, such as the coupling between the) is very difficult and the diaphragm (D) is easily aged and deteriorated due to fatigue or the like, 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.

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

The water hammer (W) having such a configuration has a much higher 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 by the nipples N only, it is important to seal the coupling portion with the nipples N, but this coupling portion is likely to deteriorate, so that the compressor body may leak during long-term use. There is concern.

In addition, the water hammer preventers W and W 'of FIG. 1 and FIG. 2 are made to apply constant back pressure to the diaphragm D or the airbag A by a compressor body. 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-Charles' 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 absorbing effect 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 (W, W '), the surface area of the interface between the fluid and the compressor body, that is, the interface of the pressure chamber is enlarged and reduced in accordance with the shock absorption. That is, since the diaphragm (D) or the airbag (A) itself repeats expansion and contraction, its material must be composed of elastic material, durability, toughness and a very expensive and stable 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 was also a problem of causing excessive stress or corrosion in the pipe P by causing local boiling or deformation.

In FIG. 3 according to the prior art, the water hammer arrester 11 constitutes a pressure chamber C filled with a pressure gas by a nipple 17, and the pressure chamber C has an orifice 15. The restriction plate 14 is partitioned into a first space C1 and a second space C2, and the first space C1 is provided with an air bag 13 through which fluid is communicated from the pipe P.

Such a water hammer preventer 11 injects fluid into the bellows-type airbag 13 when the hydro-leap phenomenon occurs in the pipe P, thereby expanding the airbag 13, whereby the pressure fluid in the first space C1 It moves to the second space (C2) through the narrow orifice 15 of the limiting plate 14 to buffer the shock caused by the hydraulic jump in the pipe (P).

The water hammer of FIG. 3 has such an excellent effect, but the structure thereof is somewhat complicated, resulting in manufacturing cost problems.

In FIG. 4 according to the prior art, the water hammer preventer 21 is sealed in the cylindrical body 22 by a cap 27 by receiving a piston 24 elastically biased by a spring 25. O-ring 26 is provided on the outer periphery of the piston 24 is sealed so that the pressure in the pipe does not enter the fluid in the pipe 25 side.

Such a water hammer preventing device 21 of Figure 4 has a relatively simple configuration and easy to manufacture, but has some problems as follows.

First, the problem is caused by the characteristics of the spring (25), but the damping element is necessary for the damping phenomenon of the spring 25 is an elastic element, so the efficient damping is not achieved and the reaction is increased. In order to solve such a problem, since a large spring having a large energy dissipation due to internal friction must be used, the length and size of the water hammer 11 are increased, resulting in problems in the installation space. In addition, water hammer occurs every time the valve is opened and closed, so fatigue occurs in the spring 25, and spring steel having a large elasticity has low corrosion resistance, so durability can be guaranteed when used in a humid environment such as piping. There will be no.

5 shows a method of forming a hemispherical head 2 on one side of the body 1 of the water hammer.

In FIG. 5, the water hammer is formed in a substantially cylindrical shape and has a compressor body filled therein to form a pressure chamber C, and preferably a hemispherical head 2 which seals one end thereof. 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 gradually reduced in an inclined state between the end of the body 1 and the neck 3. The rater 4 is formed.

In the pressure chamber C of the body 1, a piston 5 having a U-shaped cross section is preferably housed. The pressure of the compressor body in the pressure chamber C of the piston 5 is opposite to the head 2. Is elastically biased and caught by the shoulder 4 to prevent its departure 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 pipe 7 is coupled to the pipe line of the pipe P by brazing or soldering.

The water hammer of the configuration of FIG. 5 has the effect of providing a water hammer preventive having excellent durability with a very simple structure that is less likely to be corroded or damaged, but has some problems as follows.

First, such a water hammer is generally attached to the neck of the water hammer by the solder brazing or welding at the end of the water hammer, that is, a screw connection member 7 made of brass is attached to the pipe line. However, there is a problem that poisonous substances such as lead flow into the pipe line because they are connected by brazing, soldering, or welding in the proper connection of the neck 3 and the screw connection member 7. .

Secondly, when the neck 3 and the screw member 7 are combined, the manufacturing process is lengthened since the high temperature of solder, brazing or welding is basically applied, and the water hammer 1 and the screw member ( There was a problem that the deformation caused by heat in 7).

Third, if the airtightness is lowered due to the failure of brazing, soldering or welding, for example, air bubbles, in the brazing, soldering or welding process of joining the neck 3 and the screw member 7, leakage occurs in the pipe. There is a problem that the durability of the water hammer preventer 1 cannot be guaranteed.

Accordingly, an object of the present invention is to prevent the contamination in the piping pipeline due to the leakage of harmful substances such as lead by eliminating the thermal process when the neck 3 and the screw member 7 is coupled, the water hammer preventive to increase the airtightness To provide.

1 to 5 is a cross-sectional view showing the configuration of a conventional water hammer;

Figure 6 is a cross-sectional view showing the configuration of the present water hammer.

Figure 7 is a cross-sectional perspective view showing the configuration of the water hammer of the present invention.

<Explanation of symbols for the main parts of the drawings>

101: body 102: head

105: piston 111: shoulder

113: neck 115: bidding

117: adapter

In order to achieve the above object, the water hammer of the present invention has a sealed head on one side and a body in which a compressor body is filled, and an elastic bias to the opposite side of the head by a pressure gas housed in the body. A piston to be formed, a neck formed on the opposite side of the body to the shaft, and a neck connected to the pipe, and a shoulder connecting the neck and the body to prevent separation of the piston ( shoulder), a beading formed at the open end of the neck, an adapter coupled to the neck, and an O-ring formed on an outer circumferential surface of the adapter to be tightly coupled to the bead. .

Such specific features and advantages of the water hammer preventer of the present invention, as well as details of a method and apparatus for manufacturing the same will be more clearly understood from the following description of the preferred embodiments with reference to the accompanying drawings.

(Example)

The configuration of the present invention will be described in detail with reference to FIGS. 6 and 7. The water hammer preventing device 100 according to the present invention is formed in a substantially cylindrical shape, and a body 101 which forms a pressure chamber C by filling the compressor body 103 therein, and one end thereof integrally with the body 101. Preferably, a hemispherical head 102 to be sealed, a piston 105 housed in the body 101 and elastically biased to the opposite side of the head by the pressure gas 103, and a shaft diameter than the body 101 are sealed. And a neck 113 connected to a pipe (not shown), a shoulder 111 for integrally connecting the neck 113 and the body 101 to prevent the piston 105 from being separated, and the neck ( A beading 115 formed at an open end of the 113, an adapter 117 coupled to the neck 113, a groove 119 formed in the female fitting portion of the adapter 117, and the groove ( It is formed on the outer periphery of the 119 is composed of an O-ring 119 to be hermetically coupled to the beading 115.

A groove 119 is formed in the female fitting portion of the adapter 117 and an O-ring 121 is formed in the outer circumference of the groove 119 of the formed female fitting. The open end of the adapter 117 and the neck 113 is forcibly coupled by inserting the female fitting portion of the adapter 117 such as a screw tube into the open end of the neck 113 with a strong force in the manufacturing process. At this time, the beading 115 formed in the neck 113 and the O-ring 121 attached to the outer circumferential surface of the adapter 117 are strongly bonded to prevent the fluid such as water from leaking to the outside of the body 101. do. In addition, the water hammer preventer 100 is prevented from being separated from the pipe line due to the impact of hydraulic pressure or water hammer.

Between the end of the body 101 and the neck 113, a shoulder 111 gradually reduced in the inclined state is formed integrally with the body 101. In the pressure chamber C of the body 101, a piston 105, preferably having a U-shaped cross section, is accommodated. The piston 105 is formed by the pressure of the compressor body 103 in the pressure chamber C. ) Is biased to the opposite side and is caught by the shoulder 111 to prevent departure from the body 101.

On the other hand, it is preferable that a plurality of limiting jaws 109 are formed on the outer circumference of the piston 105. On the other hand, formed between the limiting jaws 109, the plurality of O-rings 107 formed on the outer periphery of the piston prevents the leakage of the compressor body 103 from the pressure chamber (C).

As described above, the present invention can prevent the contaminants caused by brazing, soldering, or welding from flowing into the pipe line when the adapter of the water hammer is connected.

In addition, the present invention can prevent thermal deformation that may occur due to the thermal process such as brazing, soldering or welding, it is possible to shorten the manufacturing process.

In addition, the present invention has the effect of preventing the deterioration of airtightness that may occur in the thermal process as described above.

Claims (2)

In the water hammer to be connected to the pipe to buffer the water hammer phenomenon occurring in the pipe, A body 101 having a sealed head 102 on one side and having a predetermined compressor body filled therein; A piston 105 accommodated in the body 101 and elastically biased to the opposite side of the head 102 by the pressure gas 103; Neck 113 is formed on the opposite side of the head 102 of the body 101 in a shaft diameter than the body, and A shoulder 111 connecting the neck and the body to prevent the piston 105 from being separated; A biding 115 formed at an open end of the neck 113; Water hammer preventer, characterized in that the adapter 117 having an O-ring 121 is formed in the groove 119 formed in the arm fitting portion coupled to the neck 113. The method of claim 1, The female fitting portion of the adapter 117 is inserted into the open end of the neck 113 so that the beading 115 formed on the neck 113 and the O-ring 121 attached to the outer circumferential surface of the adapter 117 are provided. Water hammer preventer to be in close contact with each other.