KR200447675Y1 - Accumulator with which a check valve for drains is equipped - Google Patents

Abstract

The present invention is a buffer device provided in the check valve for the drain pipe having a control means for increasing or decreasing the closing speed of the disk in consideration of the strength of the water shock amount that varies depending on the factors such as the inner diameter of the drain pipe or water pressure, the valve casing 10 of A rotating shaft 20 rotatably penetrated is provided at an upper portion thereof, and the disk 30 is fixed to the provided rotating shaft 20 and connected to one side of the rotating shaft 20 exposed through the valve casing 10. A check valve for a drain pipe having a structure in which a member 40 is fixed therethrough, comprising: an outer cylinder (100); An inner cylinder (200) formed in the outer cylinder (100) and having an open flow hole (210) for buffering at a tip side; A piston rod (300) connected to an end of the inner cylinder (200) connected to an end thereof, and having a piston rod (300) rotatably connected to the connecting member (40); An oil (400) accommodated in the outer cylinder (100) and the inner cylinder (200); Step opening speed adjusting means (500) for increasing and decreasing the forward speed of the piston (310) inserted into the inner cylinder (200); It includes; step-by-step closing speed adjusting means 600 for increasing or decreasing the reverse speed of the piston 310 inserted into the inner cylinder 200.

Check valve, disc, oil, hydraulic, cylinder, piston, piston rod

Description

Accumulator with which a check valve for drains is equipped}

The present invention relates to a shock absorber provided in the check valve for the drain pipe having a control means for increasing or decreasing the closing speed of the disk in consideration of the strength of the water shock amount varies depending on the factors such as the inner diameter of the drain pipe-water pressure.

Generally, a check valve (or check valve) is a valve device for blocking the back flow of a fluid when an error such as a power failure or a device failure occurs on the discharge side of a pump of a flow path through which a fluid such as water flows.

Such a check valve is provided with a disk which is rotated by a fluid flow inside the valve casing, thereby preventing backflow by closing the open disk due to the backflow pressure when urgent control is required according to the fluid flow.

However, when the disc is closed under the control of the check valve, the closed disc is rapidly closed due to the water hammer generated by the reverse flow, so that the disc is strongly hit by the valve casing constituting the check valve and the like. It acts as a factor that causes damage and noise to the disk by applying an impact. This is equally derived when the disc is opened.

In order to solve this problem, it has been proposed to reduce the closing speed of the disk by mounting a hydraulic cylinder to the rotating shaft connected to the disk.

1 is an overall configuration diagram showing a conventional shock absorber is installed in the check valve for the drain pipe, Figure 2 is a cross-sectional view showing a conventional shock absorber.

As shown, the conventional shock absorber installed in the check valve for the drain pipe is provided with a rotating shaft 20 rotatably penetrated above the valve casing 10, the disk 30 is provided on the rotating shaft 20 Is fixed, and in the check valve for the drain pipe having a structure in which the connection member 40 is fixed through one side of the rotating shaft 20 through the valve casing 10, on one side of the connection member 40 The piston rod 61 rotatably connected, the piston 63 fixedly connected to the other side of the piston rod 61, and the piston 63 portion fixedly connected to the other side of the piston rod 61 are It is composed of a cylinder (65) in which the oil is contained therein and inserted into the inner side, and a flow path tube (67) communicating with both ends of the cylinder (65).

The conventional shock absorber installed in the check valve for the drain pipe made in this way, when the disk 30 is closed by the control of the check valve, the closed disk 30 is hit by a water hammer generated by the back flow In this case, the force generated by the water shock is transmitted to the piston rod 61 through the connecting member 40.

At this time, the piston rod 61 is slid backward by the transmitted force, at this time, the oil is accommodated in the cylinder 65, the oil by the piston 63 connected to the piston rod 61 of the cylinder 65 It flows into the flow path 67 connected to the end.

At this time, the amount of oil introduced is reduced because the amount is limited the moving speed of the piston (63).

For this reason, the disk 30 is prevented from being strongly hit by the valve casing 10 or the like constituting the check valve, thereby reducing damage to the disk and generation of noise.

However, in the case of the conventional shock absorber provided in the check valve for the drain pipe, the closing speed of the disk 30 is slowed because some of the force of the water shock amount transmitted to the disk 30 is used to flow oil contained in the shock absorber. For this reason, the water hammer which is continuously generated flows toward the pump P and acts as a factor that strongly hits the impeller of the pump P, causing damage to the impeller.

In addition, since the strength of the water shock generated in the drain pipe varies depending on factors such as the inner diameter of the drain pipe or water pressure, there is a case where a closing speed of the late disk 30 is required.

For this reason, the need for a control means for increasing or decreasing the closing speed of the disk 30 in consideration of the strength of the water shock amount that varies depending on factors such as the inner diameter of the drain pipe or water pressure.

The present invention is to solve the problems of the prior art, the object of the present invention is to take into account the strength of the water shock amount that varies depending on factors such as the inner diameter of the drain pipe or water pressure control means for increasing or decreasing the closing speed of the disk as needed It is to provide a shock absorber provided in the check valve for the drain pipe having a.

As a technical feature for achieving the present invention, the shock absorber provided in the check valve for the drain pipe is provided with a rotating shaft rotatably penetrated above the valve casing, the disk is fixed to the provided rotating shaft, through the valve casing A check valve for a drainage pipe having a structure in which a connection member is penetrated and fixed to one side of a rotating shaft, the outer cylinder comprising: an outer cylinder; An inner cylinder formed in the outer cylinder and having an open flow hole for buffering at a distal end thereof; A piston rod inserted into and connected to an end of the inner cylinder, and a piston rod rotatably connected to the connecting member at an end thereof; Oil contained in the outer cylinder and the inner cylinder; Step opening speed control means for increasing or decreasing the forward speed of the piston inserted into the inner cylinder; It includes; step-by-step closing speed adjusting means for increasing or decreasing the reverse speed of the piston inserted into the inner cylinder.

The opening speed adjusting means for each step is to be penetrated inwardly away from the buffer opening flow hole of the inner cylinder, the width of the edge is wide, the opening oil flow opening having a trumpet-shaped flow passage narrowing toward the inside Wow; An opening fixture having a connection space to be penetrated through the outer cylinder which is a position corresponding to the opening of the inner oil flow opening of the inner cylinder; The head is wider from the center to the edge in close contact with the trumpet shape of the flow passage, the side is connected to the end of the head and the outer side is exposed to the outside and the outside is spirally coupled to the connection space of the opening fixture It consists of an opening oil flow control unit having a handle connected to one end of the moving table.

The closing speed adjusting means for each step includes: a closing oil flow opening having a trough-shaped flow passage that has a wider edge and a narrower width toward the inner side of the inner cylinder through-holes; A closing fixture having a connection space to be penetrated through the outer cylinder at a position corresponding to the closing oil flow opening of the inner cylinder; The head is wider from the center to the edge in close correspondence with the trumpet shape of the flow passage, the side connected to the end of the head and the outer side is exposed to the outside and the movable platform that is spirally coupled to the connection space of the closing fixture It consists of a closing oil flow control unit having a handle connected to one end of the moving table.

The buffer device of the present invention provided in the check valve for the drain pipe further comprises a buffer closing guide portion, the buffer closing guide portion, the connecting pipe passing between the end of the inner cylinder and the end of the outer cylinder; A flow rate control valve in communication with one end of the connecting pipe penetrating the end side of the outer cylinder; It consists of a recovery pipe for communicating between the flow control valve and the outer cylinder.

The flow control valve uses a throttle check valve.

As described above, the present invention can increase or decrease the closing speed of the disk as necessary, and if the strength of the water shock generated in the drain pipe is large, the closing speed of the disk is increased to increase the closing speed of the disk. Is prevented from hitting the valve casing strongly, minimizing the disc breakage and noise, and at the same time, it prevents the impeller breakage of the pump caused by the water impulse as well as the closing speed of the disc when the strength of the water impulse is small. It can be used by decelerating, so that users can adjust the opening and deceleration speed of the disk as needed.

Hereinafter, with reference to the accompanying drawings for the configuration and operation of the embodiment of the present invention will be described in detail.

Figure 3 is an overall configuration showing that the shock absorber of the present invention is installed in the check valve for the drain pipe, Figure 4 is a cross-sectional view showing the shock absorber of the present invention, Figure 5 is a cross-sectional view taken along line AA of Figure 4, Figure 6 4 is a cross-sectional view taken along line BB, and FIGS. 7 and 8 operate step-by-step opening-closing speed adjusting means provided in the shock absorber of the present invention installed in the check valve for drain pipe under the condition that the intensity of the water shock generated in the drain pipe is constant. 9 is a diagram illustrating a state of use when the amount of oil circulated through each cylinder is increased, and FIGS. 9 and 10 are provided in the shock absorber of the present invention installed in the check valve for drain pipe under the condition that the intensity of the water shock generated in the drain pipe is constant. This is a state diagram when the amount of oil circulated through each cylinder is reduced by operating the step-by-step opening-closing speed adjusting means.

As shown, the shock absorber of the present invention is a device applied to the check valve for the drain pipe.

First, the configuration of the check valve for the drain pipe is provided with a rotating shaft 20 rotatably penetrated at the upper portion of the valve casing 10, the disk 30 is fixed to the provided rotating shaft 20, the valve casing ( 10 has a structure in which the connection member 40 is penetrated and fixed to one side of the rotating shaft 20 exposed through.

The shock absorber of the present invention connected to the check valve for the drain pipe having such a configuration is largely the outer cylinder 100, the inner cylinder 200, the piston rod 300, oil 400, step opening speed adjusting means 500, It consists of a step-by-step closing speed adjusting means 600 and the buffer closing guide 700.

The piston rod 300 is a member in which the piston 310 connected to the end of the inner cylinder 200, which will be described later, is inserted and connected to the inside, and the front end of the piston rod is rotatably connected to the connecting member 40. The rotation of the disk 30 fixedly connected to the rotating shaft 20 is rotated hinged about the rotating shaft 20 by rotating in a counterclockwise direction about the rotating shaft 20 in conjunction with the connecting member 40 rotatably connected to the reverse. By controlling the opening and closing of the flow path formed in the valve casing (10).

Here, the weight body 50 is fixed to the rotating shaft 20 on the side opposite to the connecting member 40 around the rotating shaft 20, so that the disk 30 can be closed.

The inner cylinder 200 has a structure in which a buffer open flow hole 210 is formed at a tip side close to the connecting member 40, and the inner cylinder 200 having such a structure is embedded in the outer cylinder 100. The oil cylinder 400 is accommodated in the outer cylinder 100 and the inner cylinder 200 so that the piston rod 300 may perform a piston movement by hydraulic pressure.

At this time, the capacity of the oil accommodated is to be accommodated about 80% of the inner space of the outer cylinder 100 and the inner cylinder 200, so that the piston rod 300 can perform a smooth piston movement.

The opening speed adjusting means 500 for each step is to increase and decrease the control of the forward speed of the piston 310 inserted into the inner cylinder 200 through the adjustment of the amount of circulating oil 400 to open the disk 30. Device.

Detailed configuration of the step-by-step opening speed adjusting means 500 to perform this function is to be penetrated in the inner space farther than the buffer open flow hole 210 of the inner cylinder 200, the width of the edge is wider, toward the inside Penetrating through the open oil flow openings 510 having a trumpet-shaped flow passage 511 and the outer cylinder 100 corresponding to the opening oil flow opening 510 of the inner cylinder 200. Opening fixture 520 having a connection space 521, and the head 531, head 531 that is wider from the center toward the edge in close contact with the trumpet shape of the flow passage 511 to be provided The mobile terminal 532 is connected to the end of the mobile terminal 532 is spirally coupled to the connection space 521 of the opening fixture 520, exposed to the outside one side of the handle 533 is connected to one end of the mobile table 532 And to prevent the oil 400 from leaking It consists of an opening oil flow control unit 530 having an O-ring 534 that is fitted between the handle and the opening fixture 520 to.

Here, the number of the oil flow port 510 is formed in a plurality at equal intervals along the side of the inner cylinder 200, which is expressed as about eight in the figure.

As such, the reason why the number of the oil flow holes 510 is required is to open the disk to prevent the water shock generated by the backflow during the piston movement of the piston rod 300 from being damaged by hitting the impeller of the pump P. This is to allow the oil 400 contained in the inner cylinder 200 to flow out quickly in the section in which the heavy water shock flows through the valve casing. The number of the oil flow openings 510 may be variously selected and applied according to the size of the cylinder.

And when it is not necessary to increase the opening speed of the disk due to the strength of the water hammer is small or for other reasons, by operating the handles 533 exposed to the outer cylinder 100, each opening fixture of the inner cylinder 200 ( When the amount of the oil 400 flowing out through 520 is reduced, the opening speed of the disk 30 is also slowed down by hydraulic pressure. As such, it is provided to be used by adjusting the increase and decrease of the opening speed of the disk 30 as necessary.

In the section immediately before opening, which is a section without influence of the water shock generated by the backflow during opening of the disk, the disk 30 is formed on the edge side of the oil flow port 510 so as to buffer the disk 30 from being strongly hit by the valve casing 10. By allowing the remaining oil 400 contained in the inner cylinder 200 to flow out only toward one buffered open flow hole 210, the opening speed of the disk 30 immediately before opening is drastically reduced so that the valve casing 10 may be reduced. ) To provide safe contact.

Here, the distance L1 between the buffer open flow hole 210 and the oil flow port 510 formed in the inner cylinder 200 is about 5 to 10 mm.

The step-by-step closing speed adjusting means 600 increases and decreases the reverse speed of the piston 310 inserted into the inner cylinder 200 for the closing of the disk 30 by adjusting the amount of circulating oil 400. As the main device, the configuration is substantially the same as the detailed configuration of the opening step adjusting means 500 described above.

That is, the detailed configuration of the step-by-step closing speed adjusting means 600 is a through-hole provided at the end side of the inner cylinder 200 has a wide width of the edge, having a trumpet-shaped flow passage 611 narrowing inward Closing fixture having a connection space 621 to be penetrated through the outer cylinder 100, which is a position corresponding to the closing oil flow openings 610 and the closing oil flow openings 610 of the inner cylinder ( 620 and the head 631, which is wider from the center to the edge in close contact with the trumpet shape of the flow passage 611, are connected to the ends of the head 631, and the outside of the closing fixture 620 is closed. The handle 632 spirally coupled to the connection space 621 of the, exposed to the outside one side of the handle 633 is connected to one end of the movable table 632 and the handle to prevent the outflow of oil 400 633 between the fastener 620 and the closing fixture 620 634 comprises a closed oil flow control unit 630 for having a.

At this time, the number of closing oil flow openings 610 also has about eight along the side of the inner cylinder 200. In addition, the water shock generated by the reverse flow during the piston movement of the piston rod 300 pump (P This is to allow the oil 400 to quickly flow into the inner cylinder 200 in a section in which the water shock flows through the valve casing during the closing of the disk to prevent the impeller from being damaged by being hit.

In addition, when the strength of the water hammer is small so that the closing speed of the disk does not need to be increased, the handles 633 exposed to the outer cylinder 100 are manipulated to flow through each closing fixture 620 of the inner cylinder 200. When the inflow of the oil 400 is reduced, the closing speed of the disk 30 is also slowed down by hydraulic pressure. As such, it is provided to be used by adjusting the increase and decrease of the closing speed of the disk 30 as necessary.

In the section immediately before closing, which is a section in which there is no influence of the water shock generated by the backflow during the closing of the disk, the shock absorbing closing guide 700 is buffered so that the disk 30 does not hit the valve casing 10 strongly. I use it.

Such a detailed configuration of the shock absorbing closure guide 700 is a connection pipe 710 passing between the end of the inner cylinder 200 and the end of the outer cylinder 100, and penetrates to the end of the outer cylinder 100 The flow control valve 720 is in communication with one end of the connection pipe 710 and the recovery pipe 730 for communicating between the flow control valve 720 and the outer cylinder (100).

The shock absorbing closing guide 700 having the structure as described above has a piston 310 sliding backward while the oil 400 contained in the inner cylinder 200 is rapidly leaked through each closing fixture 620 during closing. After closing the closing fixture 620, the remaining oil 400 accommodated in the inner cylinder 200 flows out only through the connection pipe 710 of the inner cylinder 200.

At this time, the flow rate of the oil 400 flowing through the connecting pipe 710 is controlled before the flow rate is controlled through the flow control valve 720 so that the closing speed of the disk 30 immediately before closing is rapidly reduced. The disk 30 is provided to safely contact the valve casing (10).

In addition, to improve the opening speed of the piston rod 300 at the time of opening, the flow control valve 720 checks the throttle so that the oil 400 of the outer cylinder 100 can be introduced into the inner cylinder 200 more quickly. It is desirable to provide it as a throttle check valve.

Here, the throttle check valve is a flow control valve that flows freely in one direction to the inner diameter of the pipe, but can limit the flow in the opposite direction, the oil 400 toward the connecting pipe 710 from the recovery pipe 730 side. ) Flows freely, but is limited by the flow rate of the oil 400 from the connecting pipe 710 toward the recovery pipe 730, so that the closing speed of the disk 30 is rapidly reduced.

And the distance (L2) to the bottom of the inner cylinder 200, which is one end of the closing fixture 620 and the connection pipe 610 formed in the inner cylinder 200 is about 5 to 10 mm.

As such, the shock absorber of the present invention installed in the check valve for the drain pipe can be provided by increasing or decreasing the opening and closing speed of the disk 30 as necessary.

That is, FIGS. 7 and 8 are circulated through each cylinder by operating step-by-step opening-closing speed adjusting means provided in the shock absorber of the present invention installed in the check valve for drain pipe under the condition that the intensity of the water shock generated in the drain pipe is constant. Referring to the performance of the opening and closing of the disk 30 as a state of use when the amount of oil is increased as follows.

First, when stopping the pump (P) in operation by closing the handle (533, 633) exposed to both sides of the outer cylinder 100 in a rotational operation so that the amount of oil circulated through each cylinder is large ( The oil flowing from the P side toward the valve casing 10 flows back and flows in the opposite direction, that is, toward the pump P from the valve casing 10 side, so that the amount of water shock backflowed against the open disk 30 is encountered.

Understanding this, the force generated by the water shock is transmitted to the piston rod 300 through the connecting member 40, the piston rod 300 is slid backward by the transmitted force, at this time, the piston rod 300 to be reversed The oil 400 accommodated in the inner cylinder 200 is radially leaked out through the eight closing fixtures 620 formed at the end side of the inner cylinder 200 (see the process of FIG. 7A) and the eight openings. The oil 400 accommodated in the outer cylinder 100 is radially introduced through the fastener 520.

In this case, the heads 531 and 631 located in the vicinity of each closing fixture 620 and each opening fixture 520 are spaced apart so as not to affect the amount of oil introduced / exited through the inner cylinder 200. It provides a quick inflow / outflow. As a result, the flow path of the valve casing 10 is provided while allowing the piston rod 300 to reverse rapidly and in conjunction with this, while the disk 30 connected to the rotation shaft 20 of the valve casing 10 also rotates in a clockwise direction. Is rapidly closed (see FIG. 7B).

At this time, the amount of water shock continuously generated is limited to flow toward the pump P by hitting one side (corresponding to the right side in the drawing) of the disk 30 closing the flow path of the valve casing 10.

Due to this, the amount of water shock continuously generated continues to hit one side of the disk 30, thereby continuously transmitting the force to the disk 30, but the remaining oil 400 contained in the inner cylinder interlocked with the disk 30 rapidly. When the piston 310 sliding back closes the eight closing fixtures 620, the outflow is rapidly reduced because only the connection pipe 710 of the shock absorbing closing guide 700 flows out, which is rapidly reversed. By rapidly decreasing the speed of the piston rod 300 (see FIG. 7C), the disk 30 is provided to slowly reach the valve casing 10.

At this time, the oil 400 introduced into the connection pipe 710 flows out toward the outer cylinder 100 through the recovery pipe 730.

Then, as the opening process of the disk 30, when the suspended pump P is operated, the oil flowing rapidly from the pump P side to the valve casing 10 hits the closed disk 30 with a water shock amount. .

Understanding this, the force generated by the water shock is transmitted to the piston rod 300 through the connecting member 40, the piston rod 300 is sliding forward by the transmitted force, at this time, the piston rod 300 to be advanced The oil 400 accommodated in the inner cylinder 200 is quickly discharged through the eight opening fixtures 520 formed at the front end side of the inner cylinder 200, and is completely opened. The oil 400 contained in the outer cylinder 100 is introduced rapidly through the eight closing fixtures 620 and the return pipe 730 to provide the piston rod 300 to move forward rapidly and interlock therewith. Thus, the disk 30 connected to the rotation shaft 20 of the valve casing 10 also rotates counterclockwise to rapidly open the flow path of the valve casing 10 (see FIG. 8E).

For this reason, the water shock continuously generated flows through the open flow path of the valve casing 10. At this time, because the disk 30 is not completely open, the disk 30 in which part of the water shock is opened. The other side of the side (corresponding to the left side in the drawing) hits a part.

Due to this, the force continues to be transmitted to the disk 30, but the openings 220 are closed by the piston 310, so that the remaining oil 400 contained in the inner cylinder interlocked with the disk 30 has its outflow open. The disk 30 is reduced by rapidly decreasing the speed of the piston rod 300 which is flowing out through only one buffer opening flow hole 210 smaller than the diameter of the fastener 220 and is rapidly reversing (see FIG. 8F). Is provided to slowly open the valve casing (10).

As such, by controlling the opening and closing speed of the disk 30 through the operation of the opening-closing speed adjusting means 500, 600 step by step, it can be applied to the drain pipe having a high strength of the water shock.

9 and 10 are circulated through each cylinder by operating step-by-step opening-closing speed adjusting means provided in the shock absorber of the present invention installed in the check valve for drain pipe under the condition that the intensity of the water shock generated in the drain pipe is constant. Referring to the performance of the opening and closing of the disk 30 as a state of use when the amount of oil is reduced as follows.

First, when stopping the pump (P) in operation by closing the handle (533, 633) exposed to both sides of the outer cylinder 100 in a rotational operation so that the amount of oil circulated through each cylinder is large ( The oil flowing from the P) side toward the valve casing 10 flows back and flows in the opposite direction, that is, from the valve casing 10 side toward the pump P, so that an amount of water shock flowed back to the open disk 30 is encountered.

Understanding this, the force generated by the water shock is transmitted to the piston rod 300 through the connecting member 40, the piston rod 300 is slid backward by the transmitted force, at this time, the piston rod 300 to be reversed Due to the oil 400 accommodated in the inner cylinder 200 is radially leaked out through the eight closing fixtures 620 formed at the end side of the inner cylinder 200 (see FIG. 9A) and eight openings. The oil 400 accommodated in the outer cylinder 100 is radially introduced through the fixture 520.

At this time, the heads 531 and 631 located in the vicinity of each closing fixture 620 and each opening fixture 520 are close enough to affect the amount of oil introduced / exited through the inner cylinder 200. The inflow / outflow amount of the oil 400 is halved.

Due to this, the reverse speed of the piston rod 300 is also halved so that the piston rod 300 is slowly reversed (see FIGS. 9B and 9C) and in conjunction with the disk connected to the rotating shaft 20 of the valve casing 10. 30 also closes the flow path of the valve casing 10 while rotating slowly in the clockwise direction (see FIG. 9B and FIG. 9C).

In addition, the flow toward the pump P is restricted by hitting one side (corresponding to the right side in the drawing) of the disk 30 to close the flow path of the valve casing 10 due to the water shock continuously generated.

Due to this, the amount of water shock continuously generated continues to hit one side of the disk 30, thereby continuously transmitting the force to the disk 30, but the remaining oil 400 contained in the inner cylinder interlocked with the disk 30 rapidly. When the piston 310 sliding backwards closes the eight closing fixtures 620, the outflow is further reduced because only the connection pipe 710 of the shock absorbing closing guide 700 flows out. By slowing the speed of 300 a little further (see FIG. 9D), the disk 30 is provided to slowly reach the valve casing 10.

At this time, the oil 400 introduced into the connection pipe 710 flows out toward the outer cylinder 100 through the recovery pipe 730.

Then, as the opening process of the disk 30, when the suspended pump P is operated, the oil flowing rapidly from the pump P side to the valve casing 10 hits the closed disk 30 with a water shock amount. .

Understanding this, the force generated by the water shock is transmitted to the piston rod 300 through the connecting member 40, the piston rod 300 is sliding forward by the transmitted force, at this time, the piston rod 300 to be advanced Due to the oil 400 contained in the inner cylinder 200 flows out through the eight opening fixtures 520 formed at the tip side of the inner cylinder 200 (see FIG. 10E process), but each opening fixture 520 Each head 531 which is located in the vicinity of is located close, so that the outflow amount of the oil 400 is halved.

As a result, each head 631 is close enough to affect the amount of oil introduced / exited through the inner cylinder 200 located close to each other, thereby providing half the inflow / outflow of the oil 400.

Since the oil 400 accommodated in the outer cylinder 100 through the eight closing fixtures 620 and the recovery pipe 730 is also small inflow amount, the piston rod 300 also has a slow forward speed and is linked with the valve. The disk 30 connected to the rotating shaft 20 of the casing 10 also slowly rotates in the counterclockwise direction, thereby slowly opening the flow path of the valve casing 10 (see FIG. 10F and FIG. 10G).

Thereafter, the water shock continuously generated flows through the open flow path of the valve casing 10. At this time, since the disk 30 is not completely open, the other part of the disk 30 in which the water shock is opened is partially opened. Some hit on the side (corresponding to the left side in the drawing).

Due to this, the force continues to be transmitted to the disk 30, but the openings 220 are closed by the piston 310, so that the remaining oil 400 contained in the inner cylinder interlocked with the disk 30 has its outflow open. The disk 30 is reduced by rapidly decreasing the speed of the piston rod 300 which is flowing out through only one buffered open flow hole 210 smaller than the diameter of the fastener 220 and is rapidly reversing (see FIG. 10H). Is provided to slowly open the valve casing (10).

As such, by controlling the opening and closing speed of the disk 30 to be slow through the operation of the step-opening closing speed adjusting means (500, 600), it can be applied to the drain pipe having a small strength of the water impact amount.

1 is an overall configuration showing that a conventional shock absorber is installed on the check valve for the drain pipe,

2 is a cross-sectional view showing a conventional shock absorber,

Figure 3 is an overall configuration showing that the shock absorber of the present invention is installed in the check valve for the drain pipe,

4 is a cross-sectional view showing a shock absorber of the present invention;

5 is a cross-sectional view taken along line A-A of FIG.

6 is a cross-sectional view taken along line B-B of FIG. 4;

7 and 8 are oil circulated through each cylinder by operating the step-by-step opening-closing speed adjusting means provided in the shock absorber of the present invention installed on the check valve for the drain pipe under the condition that the intensity of the water shock generated in the drain pipe is constant. The state of use when the quantity of

9 and 10 are oil circulated through each cylinder by operating step-by-step opening-closing speed adjusting means provided in the shock absorber of the present invention installed on the check valve for drain pipe under the condition that the intensity of the water shock generated in the drain pipe is constant. It is a state of use when the amount of is small.

Applied when the water shock is small and the opening and closing speed is low

<Code Description of Main Parts of Drawing>

10 valve casing 20 rotating shaft

30: disk 40: connecting member

50: weight 61: piston rod

63: piston 65: cylinder

67: flow path tube 100: outer cylinder

200: inner cylinder 210: buffer type open flow hole

300: piston rod 310: piston

400: oil 500: step opening speed adjustment means

510: Opening oil flow port 511,611: Flow passage

520: Fixture for opening 521,621: Connection space

530: opening oil flow control unit 531,631: head

532,632 Mobile Table 533,633

534,634: O-ring 600: Closed speed control means

610: closing oil flow opening 620: closing fixture

700: closing guide for buffer 710: connector

720: flow control valve 730: recovery pipe

Claims (5)

A rotating shaft 20 rotatably penetrated is provided on the upper portion of the valve casing 10, and the disk 30 is fixed to the provided rotating shaft 20, and the rotating shaft penetrated through the valve casing 10 ( In the check valve for the drain pipe having a structure in which the connecting member 40 is fixed to one side of the 20), An outer cylinder 100; An inner cylinder (200) formed in the outer cylinder (100) and having an open flow hole (210) for buffering at a tip side; A piston rod (300) connected to an end of the inner cylinder (200) connected to an end thereof, and having a piston rod (300) rotatably connected to the connecting member (40); An oil (400) accommodated in the outer cylinder (100) and the inner cylinder (200); Step opening speed adjusting means (500) for increasing and decreasing the forward speed of the piston (310) inserted into the inner cylinder (200); And a closing speed adjusting means (600) for increasing and decreasing the reverse speed of the piston (310) inserted into the inner cylinder (200). The method according to claim 1, The step opening speed adjusting means 500 is, Opening oil having a trumpet-shaped flow passage 511 that is wider in the width of the edge and narrows inwardly from the inner side of the inner cylinder 200 to be penetrated in the inner space farther than the buffer open flow hole 210. Flow ports 510; Opening fixtures 520 having a connection space 521 to be penetrated through the outer cylinder 100 which is a position corresponding to the opening oil flow opening 510 of the inner cylinder 200; A connection space of the head 531 that is wider from the center to the edge toward the edge of the flow passage 511 and connected to the end of the head 531, the outer side of which is connected to the opening fixture 520 ( 521 is a spirally coupled mobile stand 532 and exposed to the outside, the one side is made of an opening oil flow control unit 530 consisting of a handle 533 connected to one end of the mobile stand 532 A shock absorber provided in the check valve for the drain pipe. The method according to claim 1, The closing speed adjusting means 600 for each step, Closing oil flow openings 610 having a trough-shaped flow passage 611 having a wider edge and a narrower width toward the inner side of the inner cylinder 200 through a through hole; Closing fasteners 620 having a connection space 621 to be penetrated through the outer cylinder 100 which is a position corresponding to the closing oil flow opening 610 of the inner cylinder 200; A connection space of the head 631, which is wider from the center to the edge to correspond to the trumpet shape of the flow passage 611, is connected to the end of the head 631, and the outside thereof is connected to the closing fixture 620. 621 is a helicon coupled to the mobile 632 and exposed to the outside, one side is made of a closing oil flow control unit 630 consisting of a handle 633 connected to one end of the mobile 632 A shock absorber provided in the check valve for the drain pipe. The method according to claim 1, Further includes a buffer closing guide portion 700, The buffer closing guide 700, A connection pipe 710 penetrating between an end of the inner cylinder 200 and an end of the outer cylinder 100; A flow rate control valve (720) communicating with one end of the connection pipe (710) penetrated at the end of the outer cylinder (100); Shock absorber provided in the check valve for the drain pipe, characterized in that consisting of a recovery pipe 730 for communicating between the flow control valve 720 and the outer cylinder (100). The method according to claim 4, The flow control valve 720 is a buffer device provided in the check valve for the drain pipe, characterized in that the throttle check valve.

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