KR101345996B1 - Snubber acting as a restraints for restricting pipe movement - Google Patents

Abstract

The present invention relates to an apparatus for buffering the impact on the pipe, which is mounted on the outside of the pipe to buffer impact applied from the outside of the pipe, thereby preventing damage to the pipe and, more specifically, to an apparatus for buffering the impact on the pipe, which comprises a first buffering unit for absorbing vibration and impact using flow resistance of a fluid and a second buffering unit for controlling an amount of oil filled therein using elasticity of a spring to prevent damage to the pipe caused by impact applied to the pipe. To this end, the present invention provides the apparatus for buffering the impact on the pipe, comprising: a first buffering unit including a first cylindrical housing filled with oil, a first piston moving inside the first housing, and a check valve mounted inside the first piston to generate flow resistance and a second buffering unit including a second housing having a third chamber filled with oil therein, a second piston moving inside the second housing, and a spring providing an elastic force.

Description

Snubber acting as a restraints for restricting pipe movement}

The present invention is installed on the outer surface of the pipe to mitigate the impact from the outside of the pipe to prevent damage to the pipe, in order to prevent the earthquake or external shock damage to the pipe by using fluid flow resistance or the elastic force of the spring A plumbing shock absorber that operates.

In general, the pipe shock absorber is disposed between the outer surface and the support surface of the pipe to prevent damage to the pipe by limiting its impact or vibration when an external shock (earthquake, explosion accident, hammering, etc.) is applied.

In particular, in the case of primary piping inside a nuclear power plant, pipes carrying dangerous goods such as high-temperature and high-pressure plumbing pipes of thermal power plants, and pipes carrying dangerous goods such as gas pipes and oil pipelines, large-scale radiation spills may occur when damaged by an earthquake or other external impact. Seismic design is indispensable because it causes secondary risks such as damage to major equipment such as turbines, human damage and explosion accidents due to strong steam leakage.

The conventional pipe shock vibration absorbing device is a vibration absorbing device for supporting a piping system and reducing vibration generated in the piping system by external force, as disclosed in Korean Patent Publication No. 10-0349722 (August 09, 2002). Located at both ends to support the pipe, the support portion is provided with a bearing to be able to rotate 360 degrees in all directions therein, the coil spring provided on the cylinder shaft to be elastic and move to the applied external force, The cylinder shaft and shoe are coupled to each other so as to linearly reciprocate on the inner surface of the first housing, to create friction damping, to increase the contact force between the lining and the cylinder, and to maintain a constant magnitude of damping. Wedges inserted at the corners and washers built between the ends of the coil springs and the shoes to equalize the compressive force of the coil springs. The.

Accordingly, the conventional pipe shock absorber shown in Figure 1 can be seen that the buffering effect through the elastic force of the spring and the friction force of the lining unit. Such a conventional pipe buffer device may be slightly inadequate for the role of catching a large shock or vibration applied to the pipe because the buffer action by the fluid resistance is excluded.

Another conventional pipe shock absorber is capable of thermal expansion of the piping device, as disclosed in Korean Patent Publication No. 10-0230482 (August 23, 1999), while suppressing movement of the piping device during dynamic movement, and vibrating Provide isolation. Accordingly, the shock absorber is composed of first and second displacement generating parts, and the first and second displacement generating parts are mutually connected by a restraining device for restraining displacement of the first and second displacement generating parts with respect to each other. Combined. The restraint device consists of first and second parts, the first and second parts generally being configured to face each other with respect to the central axis of the restraint device. The restraint device also consists of third and fourth components, the third and fourth components being offset from the first and second components near the central axis. The first, second, third and fourth parts of the restraint device are joined to each other by a helical coil of an energy absorbing wire rope.

Here, the conventional pipe shock absorber has a problem that the shock absorbing capacity is lowered because the shock absorbing function only by the elastic force of the coil spring and the damping force of the lining.

In addition, the conventional pipe shock absorber has a problem that there is no confirmation window for checking the internal oil state of the shock absorber from the outside, there is no way to visually check the state that the shock absorber is contracted by vibration.

1. Registered Patent Publication No. 10-0349722 (August 09, 2002) 2. Registered Patent Publication No. 10-0230482 (August 23, 1999)

Accordingly, an object of the present invention is to damage the pipe by limiting the vibration applied to the pipe through the buffer unit for performing the buffering action using the flow resistance of the fluid and the buffer unit for controlling the amount of oil filled therein by using the elastic force of the spring. It is to provide a pipe shock absorber to prevent.

Another object of the present invention is to provide a shock absorbing device having an indicator for visually confirming the state in which the shock absorber is contracted by vibration and a confirmation window for confirming the oil filling state in the shock absorber.

In order to achieve the above object, the pipe shock absorber of the present invention is a second shock absorbing vibration and shock using the flow resistance of the fluid and the second to control the amount of oil filled therein using the elasticity of the spring It is composed of a buffer unit, it is connected between the pipe and the support surface is characterized in that to protect the pipe from vibration or shock applied to the pipe.

The first shock absorbing unit of the present invention is linearly moved in close contact with the inner surface of the first housing and the first housing having a cylindrical shape filled with oil in the first shock absorbing unit, and the first chamber and the second housing inside the first housing. A piston rod connected to one side of the piston and a check valve which is mounted inside the first piston and the first piston that divides into a chamber and generates a flow resistance, and one side of which is fixed to an outer surface of the pipe. It is characterized in that it comprises a cover member which is arranged to be slidably movable on the outer surface of the joint and the first housing, is connected to the piston rod and moved together when the piston rod is moved.

The second shock absorbing unit of the present invention is elastically applied to the second piston and the second piston which is fixed to one end of the first housing and is linearly moved in close contact with the inner surface of the housing and the third chamber in which oil is filled. A connecting rod fixed to one end of the spring and the housing to be connected to the outside of the housing and one side is fixed to the fixed shaft or the support surface and the other side includes a second connection joint fixed to the connecting rod.

The first housing of the present invention is characterized in that the confirmation window for confirming the amount of oil inside the first housing is formed, and further comprises an indicator connected to the first housing outer surface for measuring the moving distance of the cover member. do.

In the check valve of the present invention, the opening and closing spring is located at the center, the valve body is located at both sides of the opening and closing spring, and an oil flow path is formed at one side of the valve body to limit the bidirectional movement of the pipe using oil flow resistance. .

In the second housing of the present invention, an oil passage is located at one side thereof, and a third chamber in which the oil of the first housing is filled is formed, and the third chamber measures the elastic force of the second piston and the spring. It is characterized by using.

The connecting rod of the present invention includes a supporting part fixed to one side of the second housing to support the spring and a connecting shaft extending from the supporting part and having a hollow interior, and a connecting member connecting the connecting shaft and the second connecting joint. Characterized in that configured.

As described above, the pipe shock absorber of the present invention can prevent the pipe from being damaged by preventing the pipe from being flowed by hydraulic pressure.

In addition, the pipe shock shock absorber of the present invention can easily check the state of the pipe shock shock absorber through the confirmation window for confirming the oil filling state inside the shock absorber and the indicator for visually confirming the contracted state of the shock absorber. There is an advantage.

1 is a cross-sectional view showing a conventional pipe shock absorber.
2 is a perspective view of a pipe shock absorber according to the present invention.
3 is a cross-sectional view of the pipe shock absorber according to the present invention.

In one aspect, the present invention is a shock absorber disposed between the pipe and the fixed shaft or the pipe and the support surface to absorb the vibration and shock applied to the pipe, the shock absorber to limit the flow resistance of the fluid and the movement of the fluid to vibrate And a first shock absorbing unit 400 for absorbing the shock and a second shock absorbing unit 500 for controlling the amount of oil filled therein by using the elasticity of the spring. The first shock absorbing unit 400 includes a first shock absorbing unit 400. The first housing 130 having a cylindrical shape filled with oil in the shock absorbing unit and the first housing 130 are linearly moved in close contact with the inner surface of the first housing, and the first chamber 131 and the second chamber 132 are disposed inside the first housing. A check valve 125 and the first piston 120 mounted inside the first piston 120 and the first piston 120 to block the oil block to block the flow of the first piston to block the flow of the first piston. Piston rod 110 and one side connected to one side of the blood The ton rod 110 and the other side are arranged to be slidably movable from the outer surface of the first connecting joint 100 and the first housing 130 fixed to the outer surface of the pipe, and connected to the piston rod 110 to connect the piston. And a cover member 140 which is moved together when the rod is moved. The second buffer unit 500 is fixed to one end of the first housing 130 and filled with oil in the third chamber 133. The spring 230 which provides elastic force to the second piston 220 and the second piston 240 to be linearly moved in close contact with the second housing 220 and the inner surface of the second housing 220 is formed. And a connecting rod 210 fixed to one end of the second housing 220 to connect to the outside of the second housing, and one side of the second connecting joint fixed to the fixed shaft or the support surface. Provides a pipe shock absorber comprising a (200).

In another aspect, the present invention, the impact pipe further comprises a confirmation window for confirming the amount of oil inside the first housing and an indicator connected to the outer surface of the first housing to measure the moving distance of the cover member. Provide shock absorbers.

In another aspect, the present invention, the check valve is located in the center of the opening and closing spring, the valve body is located on both sides of the opening and closing spring, an oil flow path is formed on one side of the valve body using the oil flow resistance or the valve body is closed By providing a pipe shock absorber, characterized in that to limit the bi-directional movement of the pipe.

In another aspect, the present invention, the second housing is the oil passage is located on one side, the third chamber is filled with the oil of the first housing is formed, the third chamber is the amount of oil filled inside 2 is controlled by the elastic force of the piston and the spring, the connecting rod is fixed to one side of the second housing and the support shaft for supporting the spring and the connecting shaft extending from the support portion and empty inside, and the connecting shaft and the second It provides a pipe shock absorber characterized in that it comprises a connecting member for connecting the connection joint.

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

In this process, the size or shape of the components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms that are specifically defined in consideration of the configuration and operation of the present invention may vary depending on the intention or custom of the user or operator. Definitions of these terms should be based on the content of this specification.

1 is a cross-sectional view showing a conventional pipe shock absorber, Figure 2 is a perspective view of a pipe shock absorber according to an embodiment of the present invention, Figure 3 is a pipe shock absorber according to another embodiment of the present invention It is a cross section.

As shown in FIGS. 2 to 3, the present invention includes a first piston 120 and a first connection joint 100 in which a first housing 130 filled with oil and a check valve 125 are formed. The first shock absorbing unit 400 and the spring 230 is composed of a second shock absorbing unit 500 configured to include a second housing 220 and a second connection joint 200 disposed therein.

The first buffer unit 400 according to the present invention buffers using the flow resistance of the oil. The first shock absorbing unit 400 includes a first piston 120 and a piston rod partitioned into a cylindrical first housing 130, a first chamber 131, and a second chamber 132 filled with oil therein. It comprises a 110 and the first connection joint 120 and the cover member 140.

As shown in FIG. 2, the pipe shock absorber according to the present invention further includes an indicator 160 connected to the outer surface of the housing and measuring a moving distance of the cover member 140. Accordingly, the present invention can determine the magnitude of the impact applied to the outside, the oil filled state and the state of the pipe shock buffer (snubber) through the confirmation window 150 described above can be visually confirmed from the outside.

As shown in FIG. 3, the first housing 130 of the present invention may check the amount of oil inside the first housing 130 by placing a confirmation window 150 (site glass) on the outside. In addition, one end of the first housing 130 is mounted with a packing member 135 for sealing the other end of the first housing and passing the piston rod 110 in a sealed state.

The first piston 120 moves linearly in close contact with the inner surface of the first housing and simultaneously partitions the inside of the first housing into the first chamber 131 and the second chamber 132. In addition, the first piston 130 is formed with a check valve 125 for generating a flow resistance of oil therein. The first piston 130 is connected to the first connection joint 100 located outside the first housing through the piston rod 110.

The first connection joint 100 is connected to the pipe or the support surface at a position corresponding to the second connection joint 200 made structurally the same. The first connection joint 100 and the second connection joint 200 are connected to the support surface or the beam by a hinge or pin through a separate fixed shaft (clavis bracket). In addition, the first connection joint 100 and the second connection joint 200 are connected to and fixed through a clamp (not shown) when connected to the pipe to absorb the shock. In addition, when the first connection joint 100 and the second connection joint 200 are fixedly connected to the pipe or the support surface, they are connected through the spherical plain bearing 202 formed at the center of the circular connection portion. The spherical plain bearing 202 is characterized by being rotated 360 degrees. In addition, the first and second joints 100 and 200 have a rotation fixing part in which threads are formed in a direction orthogonal to a direction in which the shock absorbing units 400 and 500 absorb shocks. This rotation fixing part is connected to the piston rod 110 or the connecting rod 210. The spherical plain bearing 202 can be easily connected when the pipe shock absorber is connected to the pipe or the fixed shaft, and additionally, the rotation fixing part is configured to lock nut-type fixing bolt 201 is more firmly fixed.

The cover member 140 is connected to the piston rod and moved together when the piston rod 110 is moved. Since the piston rod 110 flows inside the first housing, oil remains on the outer surface. The cover member 140 serves to prevent oil remaining on the outer surface of the piston rod 110 from being exposed to the outside and being contaminated.

The second shock absorbing unit 500 according to the present invention is a second piston 220 which is fixed to one end of the first housing and is formed with a third chamber in which oil is filled, the second piston linearly moving in the inner surface of the second housing 220. 240, a spring 230 providing an elastic force, a connection rod 210 connected to the outside of the second housing, and a second connection joint 200.

The second housing 220 is fixed to one end of the first housing 130 and the oil passage 250 is formed on the contact surface with the first housing 130 so that the impact is applied from the outside through the oil passage 250. The oil filled in the two chambers 132 enters and exits. In addition, a second chamber 240 is positioned at one end of the second housing 220 to form a third chamber 133 in which oil entering and exiting through the second chamber 132 is filled.

The second piston 240 is linearly moved inside the second housing 220 according to the amount of oil filled in the third chamber 133. The spring 230 is positioned between the connecting rod 210 fixed to one end of the second housing 220 and the second piston 240 that is linearly moved inside the second housing 220, thereby providing a constant elastic force to the second piston ( 240). This constant elastic force serves to control the amount of oil filled in the third chamber (133).

That is, the spring 230 flows together with the second piston 240 according to the amount of oil introduced into the third chamber 133 when an impact is applied from the outside, and after a predetermined time passes, the spring 230 flows into the third chamber 133. The filled oil is pushed back into the second chamber 132.

The connecting rod 210 is fixed to one end of the housing and connected to the second connecting joint 200. Here, the connecting rod 210 is fixed to one side of the housing and is connected to the support part 211 and the support part 211 to support the spring, and is connected to the connecting shaft 212 and the connecting shaft 212 of the cylindrical shape of the hollow inside the second connection. It is configured to include a connection member 213 for connecting the joint 200.

One end of the connecting member 213 is formed with a screw thread and is connected to the second connection joint 200. The first connection joint 100 and the second connection joint 200 described above further strengthen the fixing force by additionally using the fixing bolt 201 when connected to the piston rod 110 or the connection rod 210, respectively.

The check valve 125 of the present invention is disposed inside the first piston 120 and includes two valve bodies 129 and an opening / closing spring 128 that provides elastic force to the valve body.

The check valve 125 has an opening and closing spring 128 at the center thereof. The opening / closing spring 128 provides a resilient force in a direction in which the valve body 129 is located at both sides thereof so that the valve body 129 is far from the center. That is, the elastic force is provided in the direction in which the valve body 129 opens.

An oil filling groove 127 is formed in the inner surface of the first piston 120 which is in close contact with the front surface of the valve body 129. An orifice (not shown) is formed radially in the valve body 129 to flow oil between the first chamber 131 and the second chamber 132.

When the valve body 129 is closed, the orifice is connected to the oil filling groove 127 to allow a small amount of oil to flow. This is to prevent the shock when the valve is opened and closed.

The oil in the first chamber 131 and the second chamber 132 may generate an oil hydraulic difference between the chambers 131 and 132 due to external impact. The hydraulic vehicle closes the valve body 129, and since the oil does not flow in the first housing 130 while the valve body is closed, the first piston 120 does not flow. This keeps the pipe from being flowed by the external impact.

After a certain period of time after the external impact, the oil flows slowly through the orifice formed in the valve body 129, which causes the check valve 125 to be opened again by the elastic force of the opening / closing spring 128 connected to the check valve 125. do. In addition, when the check valve 125 is opened, the hydraulic pressure between the first chamber 131 and the second chamber 132 is maintained in an equilibrium state. The operation of the check valve 125 described above generates a flow resistance of the fluid in the direction corresponding to the external shock.

In the operation of the pipe shock absorber according to the present invention, the oil between the first chamber 131 and the second chamber 132 is usually oil oil due to the state in which the check valve 125 is open in normal operation (when there is no external impact). Flows along. In addition, the oil filling amount of the third chamber 133 controls the amount of filling oil inside the first chamber 131 and the second chamber 132 by a constant elastic force of the spring 230.

On the other hand, when an impact is applied to the opening / closing spring 128 beyond the elastic limit, the oil pressure difference between the first chamber 131 and the second chamber 132 is a check valve 125. Acts as a closing force.

As a result, the check valve 125 is closed, and oil between the first chamber 131 and the second chamber 132 does not flow with each other. In this situation, the first piston 120 is fixed. This fixed state causes a small amount of oil to flow again through an orifice formed in the check valve 125 as time passes, and the check valve 125 is opened by a small amount of oil and an elastic force of the opening / closing spring 128. . This causes the oil between the first chamber and the second chamber to reach an equilibrium state. In addition, the check valve 125 is normally maintained in the open state by the elastic force of the opening and closing spring 128.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, Modification is possible. Accordingly, it is intended that the scope of the invention be defined by the claims appended hereto, and that all equivalent or equivalent variations thereof fall within the scope of the present invention.

100. First connection joint 110. Piston rod
120. First piston 125. Check valve
127. Oil filling groove
128. Opening and closing spring 129. Valve body
130. First housing 131. First chamber
132. Second chamber 133. Third chamber
135. Packing member 140. Cover member
150. Confirmation window 160. Indicator
200. Second connection joint 201. Fixing bolt
202. Spherical plain bearing 210. Connecting rod
211. Supports 212. Connecting shaft
213. Connecting member
220. Second housing 230. Spring
240. Second piston 250. Oil passage
400. First buffer unit 500. Second buffer unit

Claims (6)

A shock absorber disposed between a pipe and a fixed shaft or a pipe and a support surface to absorb vibrations and shocks applied to the pipe.
The buffer device controls the amount of oil filled therein by using the elasticity of the spring and the first buffer unit 400 to absorb vibration and shock by limiting the flow resistance of the fluid and the movement of the fluid. ),
The first shock absorbing unit 400 includes a first housing 130 having a cylindrical shape filled with oil in the first shock absorbing unit; A first piston 120 linearly moving in close contact with the inner surface of the first housing and partitioning the inside of the first housing into a first chamber 131 and a second chamber 132; A check valve (125) mounted inside the first piston (120) to block the flow of oil to an external impact to prevent the flow of the first piston; A piston rod 110 connected to one side of the first piston 120; One side is the piston rod 110 and the other side is the first connection joint fixed to the outer surface of the pipe (100); And a cover member 140 disposed to be slidably movable on an outer surface of the first housing 130 and connected to the piston rod 110 to move together when the piston rod is moved.
The second shock absorbing unit 500 includes: a second housing 220 having a third chamber 133 fixed to one end of the first housing 130 and filled with oil therein; A second piston 240 linearly moving in close contact with the inner surface of the second housing 220; A spring 230 providing an elastic force to the second piston 240; A connection rod 210 fixed to one end of the second housing 220 to connect to the outside of the second housing; And one side of the connection rod 210 and the other side of the second connection joint 200 fixed to the fixed shaft or the support surface.
The check valve 125 has an opening and closing spring 128 at the center, a valve body is located at both sides of the opening and closing spring, and an oil flow path is formed at one surface of the valve body 129 to use an oil flow resistance or the valve body ( 129) by closing the piping shock absorber, characterized in that to limit the bi-directional movement of the first piston. The method of claim 1,
The first housing 130, the pipe shock absorber, characterized in that the confirmation window 150 is formed to check the amount of oil inside the first housing. delete The method of claim 1,
Piping shock absorber, characterized in that configured to further include an indicator (160) connected to the outer surface of the first housing 130 to measure the moving distance of the cover member (140). The method of claim 1,
The second housing 220 has an oil passage located at one side thereof, and a third chamber 133 filled with oil of the first housing is formed, and the third chamber has a second piston ( Pipe shock absorber, characterized in that for controlling by using the elastic force of the 240 and the spring (230). The method of claim 1,
The connecting rod 210 is fixed to one side of the second housing for supporting the spring (211); and the connecting shaft (212) extending from the support and the hollow form; And a connecting member (213) connecting the connecting shaft and the second connecting joint.

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