KR20180029941A - Water piping system including slam reduction means - Google Patents

Abstract

The present invention relates to a piping system and, more specifically, to a piping system which can alleviate a slam and a water shock of a check valve by spurting water stored in a pressure tank at high pressure in the flow direction of a fluid of a main pipe when a pump of a water pipe is suddenly stopped to delay a back flow of the fluid, and by reducing pressure applied to the check valve to induce the check valve to be slowly closed.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a piping device including slam mitigation means,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piping device, and more particularly, to a piping device capable of relieving a slam phenomenon that occurs when a check valve is closed.

Generally, in the case of a pump stop or a valve closure in a piping system, there is a problem that the flow rate and the flow rate of the fluid suddenly change as a transient condition, which is called a water hammer.

As a result of this water shock phenomenon, the pressure in the pipe suddenly increases, or the pressure in the pipe falls below the saturated vapor pressure of the water, so that steam can be generated. Then, in the process of the column separation & return, Or breakage.

It is necessary to develop a piping device capable of relieving the slam phenomenon that the check valve abruptly closes due to water shock or sudden fluid movement in the piping during the pump trip.

Korean Patent No. 10-0868908 Waterproof Shock Protection System

In the present invention, when a low pressure is generated on the discharge side of the pump due to a sudden stop of the pump, the low pressure on the pump discharge side is discharged by discharging the fluid from the pressure tank, A piping device for relieving a slam phenomenon is provided.

The present invention provides a piping device capable of relieving a slam phenomenon, which is a shock pressure caused by a change in the velocity energy of the number of pipings flowing backward when the disk of the check valve is closed.

In one embodiment, the present invention provides a pump comprising: a pump for pressurizing a fluid in a forward direction;

A main pipe through which the fluid pressurized by the pump is transferred;

A check valve for opening and closing the main pipe on the discharge side of the pump;

A pressure tank connected to the main pipe at a discharge side of the check valve and operated in a first state in which the fluid of the main pipe flows in and a second state in which the fluid is discharged to the main pipe in accordance with a pressure difference with the main pipe;

A connection pipe connecting the pressure tank to the main pipe;

When the fluid in the pressure tank is discharged to the inside of the main pipe in the second state, the fluid in the pressure tank is prevented from being discharged in the reverse direction opposite to the forward direction and the fluid in the pressure tank is discharged in the forward direction A slam mitigating means having a first wall portion; .

Here, the first wall portion may be disposed inside the main pipe.

According to the present invention, it is possible to retard the reverse flow of the fluid by ejecting the high-pressure fluid stored in the pressure tank in the forward direction during the sudden stop of the pump.

The present invention has slam mitigation means for suppressing backflow of the piping water due to the fluid discharged from the pressure tank. Therefore, it is possible to suppress the backward flow of the pipe water due to the fluid discharged from the pressure tank.

Since the pressure tank and the slam mitigation means are provided at the same time, it is possible to reduce the slam or water impact applied to the check valve provided adjacent to the discharge side of the pump. It is also possible to mitigate the slam and water impact of the check valve by reducing the backflow flow rate when the disc of the check valve is closed and by reducing the change in flow rate of the last moment when the disc of the check valve is closed.

The present invention makes it possible to retard the backflow of fluid by making the end of the connecting pipe connecting the pressure tank to the main pipe or the opening of the connecting pipe facing the forward direction of the fluid. At this time, the ejector principle was applied to enhance the slam mitigation effect and the backflow delay effect. Therefore, the pressure applied to the check valve can be relatively lowered, and the reverse flow of the pipe water can be suppressed, so that the shock wave and the water shock due to the slam phenomenon of the check valve can be alleviated.

1 is a cross-sectional view schematically showing a piping device for comparison with the present invention, as a comparative example.
2 is a perspective view showing a guide tube as a slam mitigating means of the present invention.
FIG. 3 is a cross-sectional view of a guide tube bent in an elbow type according to the present invention.
4 is a cross-sectional view showing an inclined bend induction tube of the present invention.
5 is a cross-sectional view showing an embodiment in which the induction tube of the present invention is connected to a joint tube.
6 is a cross-sectional view showing an embodiment in which the induction tube of the present invention is connected to a header.
FIG. 7 is a cross-sectional view illustrating an embodiment in which the induction tube of the present invention is linearly extended and inserted into a header. FIG.
8 is a cross-sectional view showing an inflow resistance increasing portion of the present invention.
9 is a perspective view showing various embodiments of the inflow resistance increasing portion of the present invention.
10 is a sectional view showing an open state of the induction disk in the first state of the present invention.
11 is a sectional view showing a closed state of the induction disk in the second state of the present invention.
12 is a sectional view showing an embodiment in which a second opening valve is provided in the induction pipe of the present invention.
13 is an exploded view showing an embodiment of attaching and detaching of the first wall portion of the present invention.
14 is a sectional view showing the induction cylinder of the present invention.
15 is a sectional view showing an induction guide of the present invention.

Hereinafter, the configuration and operation of the piping device including the slam mitigating means of the present invention will be described.

1 is a cross-sectional view schematically showing a comparison piping device for comparison with the present invention.

1 includes a pump 2 for pressurizing the fluid introduced from the suction side 1, a main pipe 10 for conveying the pressurized fluid, and a discharge side to which the fluid delivered in the forward direction is discharged do.

1, the pump 2 and the check valve 4 can be connected to the suction side 1 or the upstream side of the main pipe 10 corresponding to the left side of the main pipe 10. [ The fluid discharged from the pump 2 is transferred to the discharge side corresponding to the right side of the main pipe 10 or to the downstream side of the main pipe 10. [

The flow inside the main pipe 10 toward the discharge side is defined as a forward flow (3). The direction in which the forward flow 3 flows is in the forward direction, and the reverse direction in the forward direction is defined as the reverse direction.

A check valve 4 may be provided on the discharge side of the pump 2 to prevent backward flow toward the suction side 1. The main pipe 10 may be provided with a flexible joint (not shown) for preventing vibration as well as a check valve 4 for preventing backflow and a shutoff valve (not shown) for interrupting the fluid flowing into the discharge side.

When the pump 2 is suddenly stopped in this piping system, the existing piping water which has been conveyed through the forward direction continues to flow in the forward direction of the main piping 10 temporarily due to the inertia, so that the negative pressure ) May occur, and a vapor cavity in the piping may occur. At this time, the number of piping of high position energy flows backward to the check valve 4, and the steam cavity is crushed and high shock wave can be generated. As a result, breakage of the check valve 4, the pump 2, and the main pipe 10 can be caused. On the other hand, the water impact may be caused by the slam phenomenon due to the disengagement of the check valve 4. [

Referring to FIG. 1 and the following equation (1), the slam phenomenon occurs when the disk 4a constituting the check valve 4 is opened in the fluid transportation direction like the reference A during driving of the pump 2, ) Refers to the phenomenon in which the velocity energy of the fluid flowing backward is converted into the pressure energy while being abruptly closed to the position B by the refluxing fluid at the time of a sudden stop. In other words, the slam phenomenon is a phenomenon in which the disc 4a 'bangs' and closes.

(1)

DELTA H = (C / g) DELTA V

(Where H is the head, C is the shock wave transmission speed, g is the gravitational acceleration, V is the fluid velocity)

Referring to FIG. 1, in order to mitigate water shock, a pressure tank 5 may be further provided in the forward direction. As soon as negative pressure and steam cavities are generated in the upstream piping of the pump 2 due to the sudden stop of the pump 2, the high pressure fluid stored in the pressure tank 5 flows and the generation of the steam cavity is suppressed. Accordingly, the pressure drop in the main pipe 10 is prevented, the shock wave due to the back flow of the fluid is attenuated, and the effect of damping the water impact to some extent can be obtained.

The provision of the pressure tank 5 can suppress the generation of cavities in the main pipe 10 and can have an effect of attenuating the shock waves of the number of backwash pipes to some extent. However, the high-pressure fluid discharged from the pressure tank 5 may cause the check valve 4 to be closed and the slam phenomenon may occur.

The backflow of the main pipe 10 is caused by the high pressure fluid discharged from the pressure tank 5 and the disk 4a of the check valve 4 can be abruptly closed by the number of the backward flow pipe. When the disk 4a of the check valve 4 is closed, a sudden change in the flow rate of the piping is caused to flow backward. Due to such a sudden change in flow velocity, the velocity energy changes to pressure energy and a shock pressure wave (slam phenomenon) (See Equation 1).

Therefore, in order to alleviate the water impact in the piping device provided with the pressure tank 5, it is possible to prevent the slam phenomenon of the check valve 4 from occurring due to the high-pressure fluid discharged from the pressure tank 5 It is necessary to provide a slam mitigating means capable of restricting backflow of the number of pipes to be supplied.

Figs. 2 to 15 show an embodiment of the present invention including the pressure tank 5 and the slam mitigating means. The piping system of the present invention having the slam mitigating means includes all piping systems such as a general water supply duct, a circulating duct for cooling and heating and industrial use, an industrial water supply duct, a petrochemical plant, and a beverage duct.

The present invention includes the pressure tank (5) and the sram relieving means to suppress the shutoff of the check valve (4) and to prevent the reverse flow of the pipe water. Therefore, even when the pressure tank 5 is installed, it is possible to reduce the slam of the check valve 4 by suppressing the reverse flow of the piping water.

The present invention relieves the check valve (4) from being closed by the pressure of the fluid discharged from the pressure tank (5) at the time of sudden stop of the pump (2) in the piping apparatus provided with the pressure tank (5) It is possible to mitigate the generation of the shock wave due to the slam phenomenon of the check valve 4 and the water shock caused thereby.

The pump 2 and the check valve 4 may be provided in plural. Each check valve 4 is connected to each pump 2 one by one and the fluid passing through the pump 2 and the check valve 4 can be transferred to the main pipe 10. [ If a plurality of pumps 2 and check valves 4 are provided, a header 12 for converging the fluid pressurized from a plurality of pumps 2 connected in parallel and transferring the fluid in the forward direction may be provided.

The pressure tank 5 prevents the negative pressure from being generated in the main pipe 10 and also relieves the pressure rise of the main pipe 10 by compressing the gas as the compressible fluid inside the pressure tank 5 when the pressure of the main pipe 10 is increased Function. The pressure tank 5 functions to relieve the pressure fluctuation of the main pipe 10 by introducing or discharging the fluid in accordance with the pressure difference with the main pipe 10. [

The pressure of the pump 2 or the main pipe 10 is lowered at the initial point of time when the pump 2 trips when the pump 2 trips which indicates abnormal operation of the pump 2 and therefore the pressure tank 5 is connected to the main pipe 10, and the pressure tank 5 functions as a buffering means for reducing the pressure drop width of the main pipe 10. [0050] The pressure tank 5 at this time is means for increasing the pressure of the main pipe 10. [

Thereafter, the fluid that has flowed to the downstream side due to inertia loses the inertial force due to frictional loss, gravity, or the like of the pipe, and returns to the upstream side of the main pipe 10. This reverse flow returns the fluid in the reverse direction. When the backflow occurs in the main pipe 10, the pressure in the main pipe 10 rises sharply, and the pressure tank 5 becomes the first state in which fluid flows in the main pipe 10, and the pressure tank 5 And serves as a buffer means for absorbing the pressure rising width of the main pipe 10. [ At this time, the pressure tank 5 is a means for reducing the pressure of the main pipe 10.

The pressure tank (5) stores the gas as a compressible fluid at the upper portion during normal operation, stores the incompressible fluid as the number of piping at the lower portion, and can prepare for water shock. When the pressure of the main pipe 10 is lowered, the amount of the piping as incompressible fluid can be introduced into the main pipe 10 by the energy of the compressed gas. When the pressure of the main pipe (10) rises, the piping water flows into the pressure tank (5), compressing the compressible gas and relieving the pressure rise of the main pipe (10).

The gas of the pressure tank 5 is compressed in the first state and expanded in the second state. Therefore, the pressure tank 5 functions similar to an elastic spring or a damper for absorbing the fluid pressure fluctuation of the main pipe 10. [ The pressure tank 5 of the present invention includes a contact type pressure tank 5 in contact with a gas and an incompressible fluid, and a non-contact type pressure tank 5 in which a bladder or diaphragm is embedded.

On the other hand, the check valve 4 is closed when the pressure on the rear side of the check valve 4 is higher than the pressure on the front side of the check valve 4. The slam is a shock pressure wave generated when the disk of the check valve (4) is abruptly closed.

The pressure on the front side of the check valve 4 at the time of tripping of the pump 2 is instantly dropped to zero and the pressure decrease width is relieved while the fluid is discharged from the pressure tank 5 to the main pipe 10 at the rear side of the check valve 4 .

The check valve 4 which is closed when the pressure on the rear side is higher than the pressure on the front side can be closed in the second state in which the fluid is discharged from the pressure tank 5 to the main pipe 10. [ In order to suppress abrupt closing, the pressure difference between the front side and the back side of the check valve 4 is reduced in a second state in which the fluid is discharged from the pressure tank 5 to the main pipe 10, and the slamming means performs this function .

In order to reduce the pressure difference between the front side and the back side of the check valve 4 in the second state, the slack relieving means is provided so that the pressure tank 5 abruptly compensates the pressure drop on the rear side of the check valve 4 in the second state Or to control the discharge directionality of the pressure compensating fluid, thereby suppressing the slam.

The fluid discharged from the pressure tank 5 during the trip of the pump 2 is for compensating the pressure drop of the main pipe 10. [ The slam mitigating means can relieve the slam by guiding the discharge direction of the fluid in the pressure tank 5 for pressure compensation to the forward direction of the main pipe 10. [ When the principle of the ejector is used to guide the fluid in the forward direction of the main pipe 10, the slam can be more effectively mitigated. The sram mitigation means can reduce the pressure difference between both ends of the check valve 4 by slowing down the pressure compensation rate on the rear side of the check valve 4. [

The method of reducing the front and rear pressure differentials of the check valve 4 when the pump 2 is tripped is a method in which the pressure rise on the back side of the check valve 4 due to the back flow or the check valve (4) a method of delaying the pressure rise on the rear side even a little.

Therefore, the slam mitigating means induces the fluid discharged from the pressure tank 5 to the main pipe 10 to be discharged to the downstream side opposite to the check valve 4 when the pump 2 is tripped. The slam mitigating means induces the fluid to be discharged to the discharging side where the fluid is discharged. For this purpose, it may be more effective to utilize the principle of ejector in the slam mitigation means.

The ejector is one of the fluid conveying apparatuses, which is similar to the fluid conveying apparatus employing the impeller rotating as the pump 2, but it is unusual that it is a fluid conveying apparatus such as an impeller that continuously rotates and has no moving structure. In the present invention, when the pressure of the main pipe 10 drops, the fluid discharged from the pressure tank 5 is discharged to the discharging side of the main pipe 10, that is, the fluid is discharged from the pump 2 and the check valve 4, It can be derived in the forward direction using the principle. In this case, the pump 2 is suddenly stopped, and the phenomenon that the fluid discharged from the pressure tank 5 to the main pipe 10 flows back to the check valve 4 and the pump 2 can be mitigated.

The present invention can reduce the slam by making the pressure behind the check valve 4 a little lower by using the principle of the ejector that gives the directionality of the discharged fluid.

In one embodiment, the piping apparatus of the present invention includes a pump 2, a main pipe 10, a check valve 4, a pressure tank 5, a connection pipe 50, and a slam mitigation means.

The pump 2 pressurizes the fluid in the forward direction and supplies it to the discharge side of the main pipe 10. [

The main pipe (10) is defined as all the pipes for conveying the pressurized fluid from the pump (2). Therefore, the main pipe 10 may include at least one of the joint pipe 13, header 12, T-type main pipe 210, first main pipe 101 and second main pipe 102.

The check valve 4 opens and closes the main pipe 10 on the discharge side of the pump 2. Since the fluid flowing back from the discharge side is blocked by the check valve 4, breakage of the pump 2 due to back flow can be prevented.

The check valve 4 is closed when the pressure on the rear side is high and can be opened when the pressure on the front side is high when the pump 2 is started. When the pump (2) trips, the check valve can be closed because the pressure on the rear side is high, and when the pump (2) is driven normally, the pressure on the front side is high.

The pressure tank 5 is connected to the main pipe 10 at the discharge side of the check valve 4. The pressure tank 5 is connected to the main pipe 10 in a first state in which the fluid of the main pipe 10 flows in according to the pressure difference with the main pipe 10, To the second state (10).

The connecting pipe 50 includes all types of piping connecting the pressure tank 5 to the main pipe 10. [ It is possible to include any type of pipe such as a double pipe or a bent pipe in the connection pipe 50 by connecting the pressure tank 5 to the main pipe 10 although it is depicted as a single pipe.

The fluid discharged in the forward direction by the slam mitigating means can suppress the vapor cavity formed by the pressure drop of the fluid in the main pipe 10 in the open or closed state of the check valve 4. [ In addition, the fluid discharged in the forward direction by the slam mitigating means can push the fluid in the main pipe 10 in the second state in the direction away from the check valve 4, It can be mitigated at its source.

The sram mitigation means is provided in the second state in which the pressure tank 5 discharges the fluid to the main pipe 10 for pressure compensation on the rear side of the check valve 4 when the pump 2 is tripped, And a first wall portion 110 for imparting a discharge directionality to the first wall portion 110.

The first wall portion 110 may be disposed in a region where the fluid in the pressure tank 5 and the fluid in the main pipe 10 intersect to give the direction of the fluid in the pressure tank 5. To this end, the first wall portion 110 may be disposed within the main pipe 10.

Therefore, the slam mitigating means can be provided at a position where the connection pipe 50 communicates with the inside of the main pipe 10. [

The first wall portion 110 suppresses the discharge of the fluid in the pressure tank 5 in the reverse direction which is the reverse direction of the forward direction when the fluid in the pressure tank 5 is discharged to the inside of the main pipe 10 in the second state And discharging the fluid in the pressure tank 5 in the forward direction. To this end, the first wall portion 110 is preferably disposed inside the main pipe 10.

The first wall portion 110 confronts the fluid in the pressure tank 5 and imparts a flow direction of the fluid, thereby forming a channel of the fluid in the defined range. Thus, the first wall portion 110 can include any type of fluid conduits, including plates, shells, in the form of planar or curved surfaces.

In one embodiment, the first wall portion 110 has a planar or curved shape and may be in the form of a plate or shell that guides the flow of fluid. The first wall portion 110 can switch the discharge direction of the fluid in the pressure tank 5 in the forward direction when the fluid in the pressure tank 5 reaches the second state in a plane or a curved surface forming the first wall portion 110 have.

In one embodiment, the first wall portion 110 faces the fluid entering the interior of the pressure tank 5 in the first state and is discharged from the pressure tank 5 to the main pipe 10 in the second state. It can be confronted with the fluid.

For example, the first wall portion 110 may be formed by an inner wall of the induction pipe 150, a side wall of the induction disk 160, a side wall of the second opening valve 153, an inner wall of the induction cylinder 140, (Not shown).

The inner wall of the induction pipe 150, which is an embodiment of the first wall portion 110, inhibits the fluid in the pressure tank 5 from flowing in the opposite direction and flows in the opposite direction of the check valve 4, .

One side of the guide disc 160, which is an embodiment of the first wall portion 110, can be pivoted to close at least a portion of the main tube 10 in the second state. One side of the second opening valve 153 shown in Fig. 13 can be pivoted to close the induction pipe 150. Fig. These can be sram mitigation means for suppressing the backward flow of the fluid in the pressure tank 5 and for guiding the forward flow 3.

One side of the guide wall 170 or the inner wall of the induction cylinder 140 which is the embodiment of the first wall portion 110 has openings or end portions exposed in the forward direction and therefore the syringe for discharging the fluid of the pressure tank 5 in the forward direction It can be a mitigating means.

On the other hand, the slam mitigating means may have a second wall portion 120 which is the opposite side of the first wall portion 110. The second wall portion 120 may be confronted with a fluid in the forward fluid or main conduit 10 conveyed from the pump 2. The second wall portion 120 is preferably disposed within the main pipe 10 together with the first wall portion 110.

The second wall portion 120 may be confronted with a forward fluid being delivered from the pump 2 in the first or second state. The second wall portion 120 can partly isolate the fluid in the pressure tank 5 from the fluid in the main pipe 10. [ When the fluid of the main pipe 10 flows to the discharge side, the forward frictional resistance can be reduced according to the shape of the second wall portion 120.

For example, the second wall portion 120 may include an outer wall of the induction pipe 150, the other side of the induction disk 160, the other side of the second opening valve 153, the outer wall of the induction cylinder 140, 170).

The outer wall of the induction pipe 150 which is an embodiment of the second wall portion 120, the outer wall of the induction cylinder 140 and the other side of the induction guide 170 are circular or streamlined, Can be reduced.

The other side surface of the induction disk 160, which is the embodiment of the second wall portion 120, opens in the direction to open the main pipe 10 in the first state, so that the forward frictional resistance can be reduced. The other side of the second opening valve 153 shown in Fig. 13 is turned to the open position with respect to the forward flow 3, thereby reducing the forward frictional resistance.

The slam mitigation means may include a support 130 for supporting the first wall portion 110 and the second wall portion 120 to the main pipe 10 or the connection pipe 50.

For example, the support 130 may include a weld 132 shown in FIG. The induction pipe 150 is inserted into the fixing hole 131 formed in the main pipe 10 and can be supported by the fixing hole 131.

The support portion 130 may include an induction disk hinge 162 or a second opening valve hinge 154. The supporting portion 130 may include a connecting portion between the induction cylinder 140 and the main pipe 10 shown in FIG. 14 or a connecting portion between the induction guide 170 and the first main pipe 101 shown in FIG. 15 .

2 to 15, the ejector effect is introduced to prevent the backflow of the pressure tank 5 and the slam phenomenon of the check valve 4 during a sudden stop of the pump 2 The sram relaxation means is provided.

The ejector is a type of jet pump that ejects water, steam, air, etc. having pressure at a high velocity from an ejection port and can send the surrounding fluid to another place. The ejector is mainly used for the pulsating and condensing of rainwater and muddy water, It can also be used to discharge or condense steam or water.

The present invention adopts such a function and structure of the ejector as the sram relaxation means. The slam mitigation means may be provided at a portion where the connection pipe 50 and the main pipe 10 are connected. As shown in FIG. 2, when the actual piping device model is constructed, when the induction pipe 150 is oriented in the forward direction as shown in FIG. 2, the water impact is mitigated by about 20% as compared with FIG.

In one embodiment, the main pipe 10 includes a joint pipe 13. The joint pipe 13 can be attached to and detached from the main pipe 10 by means of the pipe joint member 11 in the form of both open sides. 5, the connection pipe 50 and the slam mitigating means are connected to the joint pipe 13 and communicate with the main pipe 10, and the first wall portion 110 can be located in the joint pipe 13. As shown in FIG. Although not shown, the induction disk 160, the induction cylinder 140, and the induction guide 170 may also be located in the joint tube 13 of FIG.

In one embodiment, the main tube 10 includes a header 12. The header 12 is connected to the rear side of the check valve 4 and is capable of converging the fluid discharged from the pump 2. Referring to FIG. 6, the connector 50 and the slam mitigating means are connected to the header 12 and communicate with the main pipe 10, and the first wall 110 can be located in the header 12. Although not shown, the induction disk 160, the induction cylinder 140, and the induction guide 170 may also be located in the header 12 of FIG.

7, the first wall portion 110 is inserted into the header 12 from one end of the header 12 and extends horizontally (in parallel) with the header 12 so that the fluid in the pressure tank 5 is directed in the forward direction. . The induction cylinder 140 shown in FIG. 14 is also the same as the embodiment shown in FIG. 7 when it is inserted into one end of the header 12 in a forward direction and in parallel.

In one embodiment, the venturi 14 may be provided on the rear side of the slam mitigation means so as to exert a flow resistance on the fluid discharged in a forward direction from the slam mitigation means. The venturi (14) is a means for narrowing the cross sectional area of the main pipe (10). The fluid discharged from the slam mitigation means passes through the narrow cross section of the venturi 14 and speeds up and sucks the surrounding piping water due to the pressure drop. When the fluid reaches the widened end face of the venturi 14 on the rear side, since the pressure rises as the pressure rises, the backflow delay effect of the number of pipes becomes greater, and the slam easing effect of the check valve 4 can be further increased.

2 to 9 show a first embodiment of the present invention. 2 to 9 together, the pressure tank 5 is connected to the main pipe 10 by a connecting pipe 50 and the pressure tank 5 is connected to the discharge side of the check valve 4 or the check valve 4, (Discharging side) of the ink cartridge.

In one embodiment, the first wall portion 110 is in the form of a tube that is connected to the connecting tube 50 as an integral member or a separate member with the connecting tube 50. The first wall portion 110 extends into the interior of the main pipe 10 and the opening of the end portion 111 of the first wall portion 110 faces forward and in the second state the fluid in the pressure tank 5 flows into the connection pipe 50 to the inside of the main pipe 10 through the opening of the end portion 111 of the first wall portion 110.

In one embodiment, the slam mitigation means includes a pipe-shaped induction pipe 150 connected to the connection pipe 50 and disposed within the main pipe 10. [ The inner wall of the induction pipe 150 may form the first wall 110 and the induction pipe 150 may be bent toward the forward direction or diagonally forward.

The induction pipe 150 or the connection pipe 50 may extend from the outside of the main pipe 10 to the inside of the main pipe 10 and the induction pipe 150 or the connection pipe 50 may be formed such that the opening And may be bent into an elbow shape.

When a pressure drop occurs on the rear side of the check valve 4 in the emergency stop of the pump 2, the fluid can be discharged from the pressure tank 5 to the main pipe 10. [ At this time, the discharged fluid can be guided in the forward direction by the slam mitigation means.

When the end of the induction pipe 150 or the connection pipe 50 is bent toward the forward direction, the fluid discharged from the pressure tank can be guided in the direction opposite to the check valve 4. [ That is, to the discharge side.

The fluid discharged from the pressure tank 5 can be temporarily induced in the forward direction by the ejector effect of the present invention.

When the back flow of the fluid in the main pipe 10 is temporarily delayed by the sram moderation means and the pressure transmitted to the disk (4a in Fig. 1) of the check valve 4 is applied to the connection pipe 50 of the comparison object in Fig. 1 Can be relatively lower.

Further, according to the present invention, the back flow velocity or the pressure difference between the front side and the rear side of the check valve 4 can be lower than that when the connection tube 50 to be compared in Fig. 1 is applied. When the slam mitigation means is provided, the check valve 4 is closed in a state in which the differential pressure between the front side and the rear side is low, thereby relieving the slam phenomenon of the check valve 4 and achieving the water shock mitigation effect.

4, the induction pipe 150 or the connection pipe 50 may be in the form of an intrusion which extends into the interior of the main pipe 10 and is obliquely arranged such that the extended end thereof faces the forward direction of the fluid . When the end opening of the connector 50 faces the forward direction of the fluid, the opening through which the fluid is discharged is directed in the forward direction, so that the structure thereof is not particularly limited.

On the other hand, as shown in FIG. 5, a venturi 14 (VT) may be formed in the forward direction of the rear end of the pressure tank 5. When the fluid passes through the venturi 14, the cross section becomes narrower, and the velocity of the fluid is increased by Bernoulli's theorem and the pressure is lowered accordingly have. The fluid whose discharge has been stopped by the rapid stop of the pump 2 can be transferred from the pump 2 through the check valve 4 to the downstream side of the main pipe 10 through the venturi. This is also the principle of the ejector. The principle of the ejector raised by the venturi 14 is activated so that the slam generated when the disc of the check valve 4 is abruptly closed can be alleviated if the disc of the check valve 4 is closed.

When the venturi 14 is installed on the rear side main pipe 10 at the end of the induction pipe 150 or the connection pipe 50, the fluid ejected through the connection pipe 50 passes through the narrow cross section of the venturi 14 Speed can be accelerated. Since the fluid is transferred from the check valve 4 side through the venturi 14 due to the pressure drop, the reverse flow of this portion is mitigated, and the backflow delay effect of the fluid is further increased, thereby maximizing the slam easing effect of the check valve 4.

Meanwhile, as mentioned above, the pressure tank 5 stores the fluid in the normal time, and discharges the fluid to the main pipe 10 during the sudden stop of the pump 2 to prevent the negative pressure. When the fluid flows backward, a part of the fluid flows into the pressure tank (5) to absorb the impact caused by the pressure of the fluid flowing backward, thereby alleviating the impact of water. The flow of fluid into and out of the pressure tank 5 is repeated until the water shock phenomenon completely disappears.

In order to prevent water shock by the pressure tank 5, the pressure tank 5 must be maintained at a relatively high operating pressure. If the fluid is introduced into the pressure tank 5, if the frictional resistance is increased, 5) can be kept low.

The side pipe is parallel to the connecting pipe 50 and both ends are connected to the pressure tank 5 and the main pipe 10 respectively and the connecting pipe 50 is provided with a check valve The negative pressure is relieved when the fluid flows from the pressure tank 5 to the main pipe 10 and flows to the side pipe having a large frictional resistance when the fluid flows from the main pipe 10 to the pressure tank 5 There is a disadvantage that the piping structure is complicated and the production cost is increased due to the addition of separate valves and structures.

In order to solve such a disadvantage, according to a preferred embodiment of the present invention, it is preferable that the inflow resistance increasing part 600 is provided as shown in FIG.

The inflow resistance increasing part 600 may increase the resistance of the fluid flowing into the pressure tank 5 in the first state to reduce the operating pressure of the pressure tank 5. [

The inflow resistance increasing portion 600 may be installed in the flow path of the fluid in the pressure tank 5 from the pressure tank 5 to the first wall portion 110 via the connecting pipe 50.

The inflow resistance increasing portion 600 includes a resistance disk (not shown) for opening the flow path of the fluid in the pressure tank 5 in the second state and closing at least part of the flow path of the fluid in the pressure tank 5 in the first state 60).

The resistance disk 60 reduces the cross-sectional area of the passage of the fluid flowing into the pressure tank 5 when the fluid flows backward when the water shock occurs, thereby increasing the flow velocity, thereby lowering the operating pressure of the pressure tank 5 have.

The resistance disk 60 may be configured to be rotatably coupled to the end opening of the induction pipe 150 or the connection pipe 50 by a resistance disk hinge 61. The resistance disk 60 is configured to be opened when the fluid is discharged from the pressure tank 5 in the forward direction and to be closed when the fluid flows backward and the opening of the induction pipe 150 or the connection pipe 50 is partially It is preferable to cover it. The opening area of the induction pipe 150 or the connection pipe 50 covered by the resistance disk 60 may vary depending on the piping device, but it is preferable that cavitation is not caused by an increase in the flow rate which is too large.

The resistance disk 60 according to the embodiment of FIG. 9A is configured to cover only the upper part of the opening of the induction pipe 150 or the connection pipe 50, And can be pivotably coupled by the hinge 61. [

The resistance disk 60 according to the embodiment of FIG. 9 (b) is semicircularly configured to cover only a lower portion of the opening of the induction pipe 150 or the connection pipe 50, and the resistance disk hinge 61 is connected to the induction pipe 150 ) Or across the connection tube (50).

The resistance disk 60 according to the embodiment of FIG. 9C is formed in a circular shape coupled with the resistance disk hinge 61 on the upper side of the induction pipe 150 or the connection pipe 50, A resistance disk orifice 62 is formed so that fluid can pass through the center. When the fluid in the pressure tank 5 is discharged to the main pipe 10, the resistance disk 60 is completely opened and the fluid is smoothly discharged. When the fluid flows from the main pipe 10 into the pressure tank 5 The resistance disk 60 is closed and the opening of the induction pipe 150 or the connection pipe 50 is partially opened and the frictional resistance is increased so that the pressure of the fluid is reduced compared with the case where the opening is completely opened, ). Therefore, the operating pressure of the pressure tank 5 is lowered, so that the design pressure can be lowered.

The resistance disk 60 according to the embodiment of FIG. 9 (d) may be installed in the middle of the induction pipe 150 or the connection pipes 50 and 5.

The second embodiment of the slam mitigating means shown in Figs. 10 to 11 comprises an induction disk 160. Fig.

In one embodiment, the sram mitigation means includes an induction disk 160 provided within the main tube 10 between the check valve 4 and the connection tube 50.

The induction disk 160 acts as a first resistor for the fluid flowing in the forward direction and a second resistance larger than the first resistance for the fluid flowing in the reverse direction. The induction disk 160 reduces the cross sectional area of the main pipe 10 when the fluid is discharged from the pressure tank 5 to the main pipe 10 to suppress the fluid in the pressure tank 5 from flowing in the reverse direction, .

The induction disk 160 can open the main pipe 10 and close only a part of the connection pipe 50 when the pump 2 is operated. When the pump 2 trips or stops, the induction disk 160 can open the connection pipe 50 and close only a part of the main pipe 10. [

The induction disk 160 may have a first wall portion 110 facing the fluid of the pressure tank 5 discharged from the connection pipe 50. The first wall portion 110 may correspond to one side of the induction disk 160. The induction disk 160 opens and closes the main pipe 10 in accordance with the pressure of the fluid flowing in the forward direction. According to the difference between the pressure exerted by the fluid discharged from the pressure tank 5 on the first wall portion 110 and the pressure exerted on the second wall portion 120 by the fluid of the main pipe 10, The main pipe 10 can be opened and closed. When the fluid in the pressure tank 5 is discharged, the first wall portion 110 closes the main pipe 10 and restrains the fluid in the pressure tank 5 from flowing backward in the reverse direction.

The induction disk 160 may have a second wall portion 120 facing the forward fluid delivered from the pump 2. The second wall 120 may correspond to the other side of the guide disk 160.

The induction disk 160 may include a support 130 for rotatably connecting the first wall portion 110 and the second wall portion 120 to the connection pipe 50 or the main pipe 10. The support 130 may include an induction disk hinge 162.

The position of the induction disk 160 rotated to open the main pipe 10 and the position of the induction disk 160 rotated to close the main pipe 10 can be acute, Can be redirected more quickly in the forward direction.

The induction disk 160 can be pivoted to a position where the fluid in the pressure tank 5 is prevented from flowing in the reverse direction when the fluid in the pressure tank 5 is discharged from the connection pipe 50 to the main pipe 10 .

Since the inflow and outflow of fluid into and out of the pressure tank 5 are performed through a single pipe including the valve body provided with the induction disk 160, the structure is simple and installation, maintenance and repair are easy.

The induction disk 160 may be disposed at an intersection area of the main pipe 10 and the connection pipe 50. The induction disk 160 is preferably installed to be rotatable by the induction disk hinge 162 near the check valve 4 in the intersecting region of the main pipe 10 and the connection pipe 50. The induction disk 160 selectively covers the connection pipe 50 or the main pipe 10 by an open / close direction rotation. The induction disk 160 covers the inlet of the connection pipe 50 while rotating upward and covers the main pipe 10 while rotating downward. The induction disk 160 may be provided with an induction disk orifice 161 so that only a part of the fluid passes therethrough. A part of the induction disk 160 is provided in a cut shape so that only a part of the fluid can be passed.

The slam mitigating means may have a modular form in which the crossing portions of the main pipe 10 and the connecting pipe 50 in which the induction disk 160 is installed are independent. The independent modular slam mitigation means is connected to the main pipe 10 of the suction side 1 and the main pipe 10 of the discharge side by a pipe joint member 11 and is connected to a connection pipe 50 ) Can be taken as an overall T-shape.

11 showing the first state and FIG. 12 showing the second state, the inner wall of the main pipe 10 is formed so as to restrict the excessive rotation of the induction disk 160 or arrange the induction disk 160 at a desired inclination angle. An induction disk stopper 165 may be provided.

10, during the normal operation of the pump 2, the induction disk 160 is rotated upward by the urging force of the pump 2, the main tube 10 is opened and the connection tube 50 is rotated by the induction disk 160 At least partly covered. The fluid is smoothly transported along the forward direction of the main pipe 10 with minimized frictional resistance.

11, when the pump 2 suddenly stops, the pressing force of the pump 2 is extinguished. As a result, steam cavities are generated on the rear side of the check valve 4, the pressure in the main pipe 10 is lowered, The fluid that has been transported in the forward direction along the main pipe 10 can flow backward in the reverse direction as shown in FIG. The fluid stored in the pressure tank 5 is discharged to the main pipe 10 through the connection pipe 50 and the induction disk 160 is rotated downward. Thus, the connection pipe 50 is opened, the main pipe 10 is covered, and the fluid discharged to the main pipe 10 through the connection pipe 50 is guided to be blown in the forward direction.

As described above, as the fluid ejected from the pressure tank 5 to the main pipe 10 at a high pressure is directed in the forward direction of the main pipe 10, the pressure at the rear end side of the check valve 4 is relatively lowered or the backflow flow rate is delayed.

When the sram mitigation means is provided, the disc of the check valve 4 is closed when the backflow flow rate is relatively slow as compared with Fig. 1, or when the pressure on the rear end side of the check valve 4 is relatively low as compared with Fig. 1, The slam phenomenon of the water hammer 4 is relieved and the water hammer effect can be obtained.

The diameter of the induction disk 160 is formed to be smaller than the diameter of the coupling tube 50 and the diameter of the main tube 10 so that only the coupling tube 50 and the main tube 10 can be partially covered . At this time, a gap may be formed between the coupling tube 50 and the induction disk 160, and a gap may be formed between the main tube 10 and the induction disk 160.

The fluid backwardly flowing backward is moved to the check valve 4 side through the gap between the induction disk 160 and the main pipe 10. The clearance is a gap between the lower side of the induction disk 160 and the main pipe 10 in Figs.

 The fluid that flows back through the gap between the induction disk 160 and the main pipe 10 is increased in frictional resistance and the pressure is lowered so that the pressure applied to the check valve 4 is lowered and the slam phenomenon of the check valve 4 and the water shock . The clearance may have the same function as the guide disk orifice 161.

Referring to Fig. 12, there is shown an embodiment in which the second opening valve 153 is provided in the induction pipe 150 to reduce the forward frictional resistance, as an improved embodiment of the first embodiment of the slam mitigation means.

A first opening 151 exposed toward the forward direction is provided at one side of the induction pipe 150 and a second opening 152 exposed toward the opposite direction is provided at the other side of the induction pipe 150 .

At this time, a second opening valve 153 may be provided which is rotated to open and close at least a part of the second opening 152.

When the fluid in the pressure tank 5 is discharged in the second state, the second opening valve 153 closes the second opening 152, and the fluid in the pressure tank 5 is prevented from flowing backward in the reverse direction. On the other hand, the fluid in the pressure tank 5 is diverted along the inner wall bent in the forward direction of the induction pipe 150 and can be discharged in the forward direction through the first opening 151.

When the forward fluid of the main pipe 10 is faced, the second opening valve 153 can be pivoted to open the second opening 152. The frictional resistance of the forward fluid with respect to the second wall portion 120 of the induction tube 150 is greater than the frictional resistance of the forward fluid through the second opening 152 and the second opening valve 153 ). ≪ / RTI >

The second opening valve hinge 154 that rotatably supports the second opening valve 153 may be provided as in the case of the induction disk 160 described above and the second opening valve hinge 154 may be provided to restrict the rotation angle of the second opening valve 153 A second opening valve stopper 155 may be provided.

13 is an exploded view showing a fastening example of the first wall portion 110 of the present invention. The first wall portion 110 can be attached to and detached from the main pipe 10 by the insertion portion 230 and the fastening member.

The main pipe 10 has an insertion portion 230 opened for insertion of the first wall portion 110. The first wall portion 110 is inserted into the main pipe 10 through the insertion portion 230 And can be attached to and detached from the main pipe 10 by the engagement member 240. When the first wall portion 110 is fastened to the insertion portion 230, the end portion 111 of the first wall portion 110 can be aligned in a forward direction.

13 illustrates a guide tube 150 as a first wall 110 and removes the bent guide tube 150 from the insertion portion 230 of the main tube 10. FIG. Although not shown, the induction disk 160, the induction cylinder 140, and the induction guide 170 can be installed in a detachable structure using the insertion portion 230 and the fastening member in the same manner as in FIG.

The T-shaped main pipe 210 shown in FIG. 13 may also be included in the main pipe 10 of the present invention. When the T-type main pipe 210 is fastened through the pipe joint member 11, it becomes the main pipe 10 of the present invention as a whole.

The main tube 10 may include a guide tube insertion portion 230 opened for insertion of the guide tube 150. The induction pipe 150 is inserted into the main pipe 10 through the induction pipe 150 inserting unit 230 and can be attached to and detached from the main pipe 10 by the coupling member 240 of the induction pipe 150. When the induction pipe 150 is fastened to the insertion portion 230 of the induction pipe 150, the end of the induction pipe 150 may be directed in the forward direction.

The induction pipe 150 may be provided in both the connection pipe 50, the induction pipe 150 and the T-type main pipe 210. When they are centered and fastened with bolts, As shown in FIG. The guide pipe 150 can be easily taken out of the main pipe 10 by detaching the coupling member 240 of the guide pipe 150 during maintenance of the guide pipe 150.

Referring to Fig. 14, a third embodiment of the sram mitigation means is shown.

In one embodiment, the slam mitigation means includes an induction cylinder 140 that is connected to the connector tube 50 as an integral or separate member with the connector tube 50.

The induction cylinder 140 may be an intuitive rather than a curved elbow tube. The induction cylinder 140 may extend linearly from the coupling tube 50 toward the interior of the main tube 10. [

The inner wall of the induction cylinder 140 forms the first wall portion 110 and the outer wall of the induction cylinder 140 forms the second wall portion 120 and the induction cylinder 140 is connected to the main pipe 10 The supporting portion 130 may be formed.

In the second state, the fluid in the pressure tank 5 can be restrained from flowing in the reverse direction by the first wall portion 110 corresponding to the inner wall of the induction cylinder 140. The fluid in the pressure tank 5 in the second state can be discharged in a forward direction through the induction cylinder opening 141 formed in one side of the induction cylinder 140 through the interior of the induction cylinder 140. [

In the first state, the fluid inside the main pipe 10 can be introduced into the pressure tank 5 through the induction cylinder opening 141. The induction cylinder opening 141 may be exposed toward the forward direction and may be formed on the side of the induction cylinder 140.

At this time, if the shape and size of the induction cylinder opening 141 are adjustably controlled, the same effect as the flow resistance increasing portion described above can be obtained. That is, when the fluid flows backward, the frictional resistance is increased by the guide cylinder opening 141, so that the pressure of the fluid flowing into the pressure tank 5 can be reduced, and the operating pressure of the pressure tank 5 can be lowered. The pressure can be lowered.

On the other hand, if the cross-sectional area of the induction cylinder opening 141 becomes narrower toward the forward direction, the same effect as that of the venturi 14 described above can be obtained. In other words, the backflow delay effect of the number of pipes can be further increased due to the difference in sectional area between the front side and the rear side of the guide cylinder opening 141, and the ejector effect and the slam easing effect of the check valve 4 can be further increased .

Since the frictional resistance is increased by the guide cylinder opening 141 when the fluid reversely flows, the pressure of the fluid flowing into the pressure tank 5 can be reduced, the operating pressure of the pressure tank 5 can be lowered, Can be lowered.

7, when the induction cylinder 140 shown in FIG. 14 is inserted into the header 12 as shown in FIG. 7 and the induction cylinder opening 141 is formed at the end of the induction cylinder 140, .

Fig. 15 shows a fourth embodiment of the sram mitigation means.

The main pipe 10 includes a first main pipe 101 to which the pump 2 and the check valve 4 are connected and a second main pipe 102 to which the pressure tank 5 and the connection pipe 50 are connected ). The first main pipe 101 may be a main pipe 10 located at an inflow side and the second main pipe 102 may be a main pipe 10 located at a discharge side. The first main pipe 101 and the second main pipe 102 may be disposed in order in the forward direction.

In one embodiment, the slam mitigating means includes an induction guide 170 installed within the first main pipe 101 or the second main pipe 102. The induction guide 170 may be integral with or separate from the first main pipe 101 and may extend from the first main pipe 101 toward the second main pipe 102.

One surface of the induction guide 170 may form a first wall portion 110 facing the pressure tank 5 and the connection pipe 50. The other surface of the induction guide 170 may form a second wall portion 120 facing the inside of the main pipe 10. [ One side of the induction guide 170 may form a first wall portion 110 facing the pressure tank 5 and the connection pipe 50. The other side of the induction guide 170 may form the second wall portion 120 on which the pump 2 and the check valve 4 are opposed.

A portion where the induction guide 170 crosses the main pipe 10 or the connection pipe 50 may correspond to the support portion 130. [

In the second state, the fluid in the pressure tank 5 can be discharged toward the inside of the main pipe 10 through the end portion 171 of the guide. Although not shown, the fluid in the pressure tank 5 may be discharged through an induction guide opening formed in the guide 170.

The end portion 171 of the guide can be exposed in the forward direction. The induction guide 170 may be bent such that at least a portion thereof is directed toward the center of the main pipe 10. [ Thus, the fluid in the pressure tank 5 can be inhibited from flowing in the reverse direction and discharged in the forward direction.

The venturi (14) may be provided on the rear side of the end of the induction pipe (150). The fluid discharged through the induction pipe 150 passes through the narrow cross section of the venturi 14 and speeds up and the surrounding fluid can be sucked due to the pressure drop. As the fluid passes through the widened cross section again, the pressure rises, so the ejector effect increases, maximizing the backflow delay effect and slam mitigation effect of the fluid.

Although the present invention has been described in detail with reference to the embodiments of the present invention, the scope of the present invention is not limited thereto, and the scope of the present invention is substantially equivalent to the embodiments of the present invention.

4 ... Check valve 3 ... Forward flow
5 ... pressure tank 10 ... main pipe
11 ... pipe fitting member 12 ... header
13 ... joint pipe 14 ... venturi
50 ... connector 600 ... inflow resistance increasing portion
60 ... resistance disk 61 ... resistance disk hinge
62 ... resistance disk orifice 101 ... first main pipe
102 ... second main pipe 110 ... first wall portion
111 ... end portion 120 of the first wall portion ... second wall portion
130 ... support part 131 ... fixing hole
132 ... weld portion 140 ... induction cylinder
141 ... induction cylinder opening 150 ... induction tube
151 ... first opening 152 ... second opening
153 ... second opening valve 154 ... second opening valve hinge
155 ... second opening valve stopper 160 ... guiding disk
161 ... induction disk orifice 162 ... induction disk hinge
165 ... Induction disc stopper 170 ... Induction guide
171 ... end of the guide
210 ... T type main pipe 220 ... Junction point
230 ... insertion portion 240 ... engagement member

Claims (4)

A pump for pressurizing the fluid in the forward direction;
A main pipe through which the fluid pressurized by the pump is transferred;
A check valve for opening and closing the main pipe on the discharge side of the pump;
A pressure tank connected to the main pipe at a discharge side of the check valve and operated in a first state in which the fluid of the main pipe flows in and a second state in which the fluid is discharged to the main pipe in accordance with a pressure difference with the main pipe;
A connection pipe connecting the pressure tank to the main pipe;
When the fluid in the pressure tank is discharged to the inside of the main pipe in the second state, the fluid in the pressure tank is prevented from being discharged in the reverse direction opposite to the forward direction, and the fluid in the pressure tank is discharged in the forward direction A slam mitigating means having a first wall portion;
A second wall facing the forward fluid delivered from the pump or the fluid inside the main pipe; Lt; / RTI >
Wherein the first wall portion is disposed inside the main pipe,
Wherein the slam mitigation means includes an induction guide for guiding the fluid.
The method according to claim 1,
Wherein the main pipe includes a first main pipe to which the pump and the check valve are connected and a second main pipe to which the pressure tank and the connection pipe are connected,
The induction guide is installed inside the first main pipe or the second main pipe,
Wherein one surface of the guide member forms the first wall portion facing the pressure tank and the connection pipe,
And the other surface of the guide forms the second wall portion facing the fluid of the main pipe.
The method according to claim 1,
Wherein the main pipe includes a first main pipe to which the pump and the check valve are connected and a second main pipe to which the pressure tank and the connection pipe are connected,
The first main pipe and the second main pipe are arranged in order in the forward direction,
And the induction guide extends from the first main pipe toward the inside of the second main pipe.
The method according to claim 1,
Wherein the induction guide extends into the interior of the main pipe,
Wherein one side of the induction guide forms the first wall portion facing the pressure tank and the connection tube,
The fluid in the pressure tank is discharged to the inside of the main pipe through the guide,
Wherein the guide is bent such that at least a part thereof is directed toward the center of the main pipe.

Images