KR20140140452A

KR20140140452A - Water hammer arrestor

Info

Publication number: KR20140140452A
Application number: KR1020130061336A
Authority: KR
Inventors: 이덕록
Original assignee: 이덕록
Priority date: 2013-05-29
Filing date: 2013-05-29
Publication date: 2014-12-09

Abstract

The present invention relates to a water hammer absorber, and more particularly, to a water hammer absorber having a cylindrical container (100) having an upper portion sealed and an opening portion (101) A first pressure reducing plate 110; A secondary pressure reducing plate 120 formed on the inner side wall of the upper cylindrical container 100 of the primary pressure reducing plate 110 and having a plurality of through holes 121 for reducing the fluid flowing therethrough; A pressure equalization pipe 130 having one end connected to the cylindrical container 100 between the first pressure reducing plate 110 and the second pressure reducing plate 120 and the other end connected to the center of the upper surface of the cylindrical container 100; And a reverse pressure ejector 140 installed at the center of the inner upper surface of the cylindrical container 100 and introducing and spraying water through the pressure equalization pipe 130. The water pressure is reduced while passing through the first and second pressure reduction plates , The water passing through the first and second pressure reduction plates and the water sprayed through the bypass channel collide with each other and the water pressure is canceled each other. Therefore, there is no inconvenience of filling the filling gas such as nitrogen from time to time, And the piston is not installed in the water hammer absorber, so that it is possible to downsize the water hammer absorber by simplifying the structure. Moreover, the cost of the product is reduced and the economical efficiency is excellent. In addition, the flange is attached to the end of the opening mouth, It is a useful invention having a particular advantage in that it is easy to install in the pump piping and reduces vibration and noise of the pump piping.

Description

Water hammer arrestor

The present invention relates to a water hammer absorber, and more particularly, to a water hammer absorber used in a water supply pipe for absorbing water hammer applied to a pipe during water supply shutoff.

Generally, when the flow path resistance of a fluid changes, the pressure of the fluid changes. In the case of an object which is a compressible fluid, the change of the flow path resistance is merely a change of the pressure, but in the case of a liquid which is an incompressible fluid, the water head itself changes. For example, the flow of liquid entering a narrow channel from a wide channel increases its head, that is, the liquid level, which is generally referred to as a hydraulic jump phenomenon.

On the other hand, when the liquid is supplied in a limited cross section such as a pipe or the like, the problem of the change in the flow path resistance becomes more serious. For example, in the case of a water pipe, when a valve is shut off during the flow of water, a sudden change in the flow path resistance can not be absorbed by water, which is an incompressible fluid, so that a large shock wave is generated and high noise and vibration are generated. The shock wave in this liquid pipe is called a watermark hammer phenomenon.

The problem of this water hammer phenomenon can be solved by using valves that can be opened and closed slowly, by increasing the diameter of the valve, by slowing the flow rate, and by reducing the pipe length by as much as possible. However, The valve of the present invention has become more serious as the valve is switched to the one-touch type valve, thereby causing not only noise and vibration but also damage to pipes, valves, pumps, and the like.

In order to prevent such a water hammer phenomenon, a water hammer absorber connected to a pipe is generally used as shown in FIG.

As shown in the figure, the water hammer absorber 10 includes a housing 12 having a circular cross section, a piston 14 provided under the water pressure in the housing 12 so as to be vertically movable, And the other end of the threaded portion 16b is connected to the pipe 20 having the threaded portion 20a formed therein by a screw so that the threaded portion 16b, And a connecting member 16 composed of a connecting piece formed with the connecting portions 16c.

The upper end of the housing 12 is closed and the lower end of the housing 12 is open. The interior of the housing 12 has a gas chamber 12a due to the inner wall of the piston 14.

In the housing 12, the gas chamber 12a is filled with nitrogen gas as a reaction force medium which does not inflate and contract shrinkage with respect to a temperature change.

A plurality of O-rings 18 are interposed in the outer circumferential surface of the piston 14 installed in the housing 12 to seal the inner circumferential surface of the housing 12.

The conventional water hammer absorber 10 has a structure in which the water pressure transmitted through the pipe 20 is passed through the through hole 16a of the connecting member 16 screwed in the pipe 20 Is transmitted to the inside of the water hammer absorber (10). Therefore, the water hammer 12, which receives the water pressure, absorbs the water pressure, i.e., the water hammer, by moving the piston 14 disposed inside the water hammer 10 upward and compressing the gas chamber 12a.

However, the water hammer as described above must be provided with a connecting member having a threaded portion for screwing and fixing the T-shaped connecting pipe, as described above, There is a problem that the unit price is increased due to the connection member and a time required for installation is long.

In addition, there is a case where the function of the water hammer absorber is lost due to a decrease in nitrogen filled in the gas chamber during long-term use, or a rubber bag is provided in place of the gas chamber and the tank is filled again when the amount of nitrogen filled in the rubber bag is reduced. It is not only inconvenienced by the filling, but also the rubber bag is damaged and it becomes impossible to use it as a water hammer absorber.

Also, as a conventional water hammer absorber, a "water hammer absorber" of Patent Publication No. 2012-0108866 is disclosed in the published patent publication.

As shown in FIG. 2, the "water hammer absorber" of the above-mentioned Patent Publication No. 2012-0108866 comprises a cylindrical container formed by an opening (B) whose upper portion is closed and whose lower portion is opened to allow piping to pass, , A piston (E) fitted with a packing (F) for preventing leakage is filled, and a connecting port for a pipe is formed in the lower part. The top of the housing A is closed with a closed surface (C) inside the housing And the outer peripheral surface of the lower portion is provided with a circular tube G having an axial tube portion D at the end portion of the opening portion B side sealingly joined to the opening portion B of the housing A, And a packing (F) member is provided in one of the inside or outside of the circular tube which is divided by the circular tube in the inside of the housing.

However, there is a problem that the function of the water hammer absorber is lost due to a decrease in the amount of gas filled in the inside of the water hammer absorbing housing (A), and there is a problem that the recharging operation is troublesome even if a separate means for recharging the gas is provided .

SUMMARY OF THE INVENTION In view of the foregoing, the present invention has been made to solve the various drawbacks and problems caused by the conventional water hammer absorber. The object of the present invention is to provide a water hammer that has a low water pressure while passing through first and second pressure reduction plates, Since the water passing through the plate and the water sprayed through the bypass channel collide with each other, the water pressure is canceled with each other, so there is no inconvenience of filling the filling gas such as nitrogen from time to time, which is convenient to use and has a long service life Thereby providing a water hammer absorber.

Another object of the present invention is to provide a water hammer absorber which can be miniaturized due to its simple structure because it is not provided with a piston in the water hammer absorber.

Another object of the present invention is to provide a water hammer absorber which is easy to install on a pipe by mounting a flange on an end portion of the open mouth and reduces vibration and noise of the pump pipe.

In order to accomplish the above object, there is provided a water hammer absorber according to the present invention, comprising: a cylindrical container (100) having an upper portion sealed and an opening portion (101) A primary pressure reduction plate 110 formed on the inner side wall of the cylindrical container 100 near the opening 101 and having a plurality of through holes 111 for reducing the fluid flowing therethrough; A secondary pressure reducing plate 120 formed on the inner side wall of the upper cylindrical container 100 of the primary pressure reducing plate 110 and having a plurality of through holes 121 for reducing the fluid flowing therethrough; A pressure equalization pipe 130 having one end connected to the cylindrical container 100 between the first pressure reducing plate 110 and the second pressure reducing plate 120 and the other end connected to the center of the upper surface of the cylindrical container 100; And a reverse pressure ejector 140 installed at a central portion of an inner upper surface of the cylindrical container 100 and introducing water through the pressure equalizing pipe 130 to inject water.

Since the water pressure is lowered while passing through the first and second pressure reduction plates and the water passing through the first and second pressure reduction plates and the water sprayed through the bypass channels are collided with each other, It is not only easy to use but also has a long life which can be stably used for a long period of time. Since the piston is not installed in the water hammer absorber, it is possible to miniaturize the water hammer absorber by reducing the cost of the product Not only is excellent in economical efficiency, but also has a special advantage in that it is easy to install a flange on the end portion of the opening side of the pipe to reduce the vibration and noise of the pump pipe.

1 is a view showing a state where a conventional water hammer absorber according to the first embodiment is installed in a pipe,
2 is a cross-sectional view of a conventional water hammer absorber according to a second embodiment,
3 is a sectional view of the water hammer absorber according to the present invention.

Hereinafter, preferred embodiments of the inventive water hammer absorber will be described in detail with reference to the accompanying drawings.

FIG. 3 is a cross-sectional view of the water hammer absorber according to the present invention, wherein the water hammer absorber of the present invention comprises a cylindrical vessel 100 having an upper portion sealed and an upper portion opened to a pipe 101; A primary pressure reduction plate 110 formed on the inner side wall of the cylindrical container 100 near the opening 101 and having a plurality of through holes 111 for reducing the fluid flowing therethrough; A secondary pressure reducing plate 120 formed on the inner side wall of the upper cylindrical container 100 of the primary pressure reducing plate 110 and having a plurality of through holes 121 for reducing the fluid flowing therethrough; A pressure equalization pipe 130 having one end connected to the cylindrical container 100 between the first pressure reducing plate 110 and the second pressure reducing plate 120 and the other end connected to the center of the upper surface of the cylindrical container 100; And a reverse pressure ejector 140 installed at a central portion of an inner upper surface of the cylindrical container 100 for introducing and injecting water through the pressure equalization pipe 130.

It is preferable that the opening 101 is formed with a flange 102 to be coupled with the pipe and that the area of the secondary pressure reducing plate 120 is made larger than the area of the primary pressure reducing plate 110, .

The reverse pressure ejector 140 is a cylindrical body having a hollow portion inside, and a plurality of through holes 141 are radially formed on the outer circumference.

Next, the operation of the inventive water hammer absorber constructed as described above will be described in detail.

The water flowing into the opening 101 with a large pressure is reduced in pressure through the plurality of through holes 111 of the first pressure reducing plate 110 and then discharged through the plurality of through holes 121 of the secondary pressure reducing plate 120 And a part of the water that has passed through the plurality of through holes 111 is introduced into the reverse pressure ejector 140 through the pressure equalizing pipe 130. [

The water that has passed through the plurality of through holes 121 of the secondary pressure reduction plate 120 and the water that is injected into the plurality of through holes 141 of the reverse direction pressure ejector 140 are mixed with each other to absorb the water pressure .

While the present invention has been described with reference to the preferred embodiments, it is to be understood that the invention is not limited thereto and that various changes and modifications may be made therein without departing from the scope of the invention.

100: Cylindrical container 101:
102: flange 110: primary pressure reduction plate
111: through hole 120: secondary pressure reduction plate
121: through hole 130: pressure equalization pipe
140: reverse pressure ejector 141: through hole

Claims

A cylindrical container 100 having an upper portion sealed and an upper portion opened to an opening 101 to communicate with a pipe; A primary pressure reduction plate 110 formed on the inner side wall of the cylindrical container 100 near the opening 101 and having a plurality of through holes 111 for reducing the fluid flowing therethrough; A secondary pressure reducing plate 120 formed on the inner side wall of the upper cylindrical container 100 of the primary pressure reducing plate 110 and having a plurality of through holes 121 for reducing the fluid flowing therethrough; A pressure equalization pipe 130 having one end connected to the cylindrical container 100 between the first pressure reducing plate 110 and the second pressure reducing plate 120 and the other end connected to the center of the upper surface of the cylindrical container 100; And a reverse direction pressure ejector (140) installed at a center of an inner upper surface of the cylindrical container (100) to introduce and inject water through the pressure equalization pipe (130).

2. The water hammer absorber according to claim 1, wherein the opening (101) has a flange (102) coupled with a pipe.

The water hammer absorber according to claim 1, wherein the area of the secondary pressure reducing plate (120) is larger than the area of the primary pressure reducing plate (110).

2. The water hammer absorber according to claim 1, wherein the reverse-direction pressure ejector (140) is a cylindrical body having an inner hollow portion and a plurality of through holes (141) radially formed on an outer periphery thereof.