A protective device for resisting pipeline impact

Abstract

The present invention discloses a protective device against pipeline impact, wherein an annular first guide groove, a second guide groove and a third guide groove are arranged on the inner wall of an energy absorber shell, wherein guide bosses are arranged on the outer circumferential surfaces of a lower pressure plate, an action plate and an upper pressure plate of the energy absorber, wherein the guide boss on the lower pressure plate of the energy absorber is embedded in the first guide groove, the guide boss on the action plate is embedded in the second guide groove, and the guide boss on the lower pressure plate of the energy absorber is embedded in the third guide groove, and the end of a connecting rod passes through a lower connecting plate of the energy absorber, an upper pressure plate of the energy absorber, an upper energy absorbing block, an action plate and a locking plate in sequence, wherein the connecting rod is connected to the action plate and the locking plate, the upper connecting plate of the energy absorber is connected to the upper end of the energy absorber shell, and the lower connecting plate of the energy absorber is connected to the lower end of the energy absorber shell, and the device has the characteristics of active energy consumption, constant protective force and the ability to effectively reduce the dynamic stress of pipeline impact.

Description

Technical Field

[0001] The invention relates to a protective device, in particular to a protective device capable of resisting pipeline impact. Background Art

[0002] Pipelines are transportation systems that connect two or more devices to transport media. They are widely used in thermal power plants, nuclear power plants, petrochemicals and other energy industries. Due to operational needs, the opening and closing of valves in the pipe system are often adjusted during the production process, which will cause greater pipeline impact vibration. If the operation is improper, it will also cause steam hammer and water hammer. The impact of pipeline vibration and the expansion and compression waves caused by steam hammer and water hammer are transmitted in the pipeline, and impact displacement will occur at the elbows and valves. When the impact energy is large, it is easy to cause accidents such as pipeline cracking and medium leakage, which will bring great safety hazards to equipment and personnel.

[0003] At present, the main measure to protect against pipeline impact is to arrange hydraulic dampers on the pipeline. When the pipeline is subjected to impact load, the motion characteristics of the damper change, and its response stiffness increases sharply, showing the characteristics of a nearly rigid body. The pipeline impact force is transmitted to other structures through the damper. This approach cannot effectively absorb the pipeline impact energy. The impact energy will be transmitted in the pipeline system in the form of waves, resulting in a wider range and stronger destructive consequences. According to Newton's third law, under the constraint of a damper that is nearly a rigid body, the pipeline will be subjected to the reaction force of the damper, which often causes local dynamic stress to exceed the allowable stress of its material, resulting in weld cracking, pipeline deformation and other phenomena.

[0004] Therefore, it is necessary to design a more reasonable and effective pipeline impact protection device, which must have the following functions: active energy consumption, constant protection force, and effective reduction of pipeline impact dynamic stress. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a protective device for pipeline impact resistance, which has the characteristics of active energy consumption, constant protective force and the ability to effectively reduce pipeline impact dynamic stress.

[0006] To achieve the above-mentioned purpose, the pipeline impact protection device described in the present invention includes a flange connecting rod, a hydraulic damper, a lower connecting plate of an energy absorber, a lower pressure plate of an energy absorber, a lower energy absorbing block, a locking plate, an action plate, an upper energy absorbing block, an upper pressure plate of an energy absorber, an energy absorber housing, a connecting rod and an upper connecting plate of an energy absorber;

[0007] One end of the flange connecting rod is connected to the hydraulic damper, and the other end of the flange connecting rod is connected to the lower connecting plate of the energy absorber.

[0008] The lower pressure plate of the energy absorber, the lower energy absorbing block, the locking plate, the action plate, the upper energy absorbing block and the upper pressure plate of the energy absorber are located in the energy absorber shell from bottom to top in sequence, and the inner wall of the energy absorber shell is provided with an annular first guide groove, a second guide groove and a third guide groove, wherein the outer peripheral surfaces of the lower pressure plate of the energy absorber, the action plate and the upper pressure plate of the energy absorber are all provided with guide bosses, wherein the guide boss on the lower pressure plate of the energy absorber is embedded in the first guide groove, the guide boss on the action plate is embedded in the second guide groove, and the guide boss on the lower pressure plate of the energy absorber is embedded in the third guide groove, and the end of the connecting rod passes through the lower connecting plate of the energy absorber, the upper pressure plate of the energy absorber, the upper energy absorbing block, the action plate and the locking plate in sequence, wherein the connecting rod is connected to the action plate and the locking plate, the upper connecting plate of the energy absorber is connected to the upper end of the energy absorber shell, and the lower connecting plate of the energy absorber is connected to the lower end of the energy absorber shell.

[0009] The energy absorber shell is provided with ventilation holes.

[0010] The first pressure plate reset screw passes through the lower connecting plate of the energy absorber and contacts the lower pressure plate of the energy absorber.

[0011] The second pressure plate reset screw passes through the upper connecting plate of the energy absorber and contacts the upper pressure plate of the energy absorber.

[0012] The energy absorber shell is connected to the upper connecting plate of the energy absorber and the lower connecting plate of the energy absorber by connecting bolts.

[0013] It also includes a displacement pointer. A slot is arranged on the side of the energy absorber shell. The end of the displacement pointer passes through the slot and is connected to the action disk. A scale line matching the displacement pointer is arranged on the side of the energy absorber shell.

[0014] The present invention has the following beneficial effects:

[0015] During specific operation of the pipeline impact protection device described in the present invention, when the low-speed walking resistance of the hydraulic damper is less than the crushing force of the upper energy absorbing block, the crushing force of the lower energy absorbing block is less than the rated load of the hydraulic damper, so as to ensure that in a non-working state, the length of the telescopic rod of the hydraulic damper changes to match the normal expansion displacement of the pipeline, and the upper energy absorbing block and the lower energy absorbing block do not move; when an impact load appears in the pipeline, the movement speed of the pipeline at the constraint point is greater than the locking speed of the hydraulic damper, and the hydraulic damper is in a nearly rigid state. At this time, the upper energy absorbing block and the lower energy absorbing block undergo plastic deformation under the compression of the action disk, generate constant resistance, consume the pipeline impact energy, so as to realize the functions of active energy consumption and constant protective force, and effectively reduce the pipeline impact dynamic stress. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention;

[0017] Figure 2An exploded view of the present invention;

[0018] Figure 3 It is a cross-sectional view of the present invention.

[0019] Among them, 1 is a hydraulic damper, 2 is a flange connecting rod, 31 is a first pressure plate reset screw, 32 is a second pressure plate reset screw, 4 is a connecting bolt, 5 is a lower connecting plate of the energy absorber, 6 is a lower pressure plate of the energy absorber, 7 is a lower energy absorbing block, 8 is a locking plate, 9 is an action plate, 10 is a displacement pointer, 11 is an upper energy absorbing block, 12 is an upper pressure plate of the energy absorber, 13 is a shell of the energy absorber, 14 is an upper connecting plate of the energy absorber, and 15 is a connecting rod. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0021] refer to Figures 1 to 3 The pipeline impact protection device of the present invention comprises a flange connecting rod 2, a hydraulic damper 1, a lower connecting plate 5 of an energy absorber, a lower pressure plate 6 of an energy absorber, a lower energy absorbing block 7, a locking plate 8, an actuating plate 9, an upper energy absorbing block 11, an upper pressure plate 12 of an energy absorber, an energy absorber housing 13, a connecting rod 15 and an upper connecting plate 14 of an energy absorber; one end of the flange connecting rod 2 is connected to the hydraulic damper 1, and the other end of the flange connecting rod 2 is connected to the lower connecting plate 5 of the energy absorber, the lower pressure plate 6 of the energy absorber, the lower energy absorbing block 7, the locking plate 8, the actuating plate 9, the upper energy absorbing block 11 and the upper pressure plate 12 of the energy absorber are arranged in sequence from bottom to top in the energy absorber housing 13, and an annular first guide groove, a second guide groove and a second guide groove are arranged on the inner wall of the energy absorber housing 13. Grooves and third guide grooves, wherein guide bosses are arranged on the outer peripheral surfaces of the lower pressure plate 6, the action plate 9 and the upper pressure plate 12 of the energy absorber, wherein the guide boss on the lower pressure plate 6 of the energy absorber is embedded in the first guide groove, the guide boss on the action plate 9 is embedded in the second guide groove, and the guide boss on the lower pressure plate 6 of the energy absorber is embedded in the third guide groove, and the end of the connecting rod 15 passes through the lower connecting plate 5 of the energy absorber, the upper pressure plate 12 of the energy absorber, the upper energy absorbing block 11, the action plate 9 and the locking plate 8 in sequence, wherein the connecting rod 15 is connected to the action plate 9 and the locking plate 8, the upper connecting plate 14 of the energy absorber is connected to the upper end of the energy absorber shell 13, and the lower connecting plate 5 of the energy absorber is connected to the lower end of the energy absorber shell 13.

[0022] A ventilation hole is provided on the energy absorber shell 13; the first pressure plate reset top screw 31 passes through the lower connecting plate 5 of the energy absorber and contacts the lower pressure plate 6 of the energy absorber; the second pressure plate reset top screw 32 passes through the upper connecting plate 14 of the energy absorber and contacts the upper pressure plate 12 of the energy absorber; the energy absorber shell 13 is connected to the upper connecting plate 14 of the energy absorber and the lower connecting plate 5 of the energy absorber by connecting bolts 4.

[0023] The present invention further includes a displacement pointer 10. A slot hole is provided on the side surface of the energy absorber housing 13. The end of the displacement pointer 10 passes through the slot hole and is connected to the action disk 9. A scale line cooperating with the displacement pointer 10 is provided on the side surface of the energy absorber housing 13.

[0024] The guiding boss on the energy absorber lower pressing disk 6 is embedded in the first guiding groove, the guiding boss on the action disk 9 is embedded in the second guiding groove, and the guiding boss on the energy absorber lower pressing disk 6 is embedded in the third guiding groove, so as to ensure that the energy absorber lower pressing disk 6, the action disk 9 and the energy absorber upper pressing disk 12 do not cause loosening of the threaded connection due to axial rotation during the movement process and induce non-axial compression deformation of the upper energy absorbing block 11 and the lower energy absorbing block 7; a ventilation hole is provided on the energy absorber housing 13 to ensure that the air in the energy absorber housing 13 can be discharged in time during the movement process of the action disk 9 and the locking disk 8; during use, rotate the first pressing disk reset screw 3 and the second pressing disk reset screw 32 to push the energy absorber upper pressing disk 12 and the energy absorber lower pressing disk 6 to move until the upper energy absorbing block 11 and the lower energy absorbing block 7 are pressed tightly to ensure that the dead band is eliminated.

[0025] During use, the hydraulic damper 1 is connected to the on-site rigid structural member, and the connecting rod 15 is connected to the pipeline accessory. Since the low-speed walking resistance F1 of the hydraulic damper 1, the crushing force F2 of the upper energy absorbing block 11, the crushing force F3 of the lower energy absorbing block 7 and the rated load F4 of the hydraulic damper 1 satisfy the following relationship: F1 < F2 = F3 < F4. When the pipeline does not undergo impact, due to temperature change, the pipeline generates thermal displacement and drags the piston rod of the hydraulic damper 1 to move. At this time, the relative positions of the action disk 9 and the locking disk 8 with respect to the energy absorber housing 13 do not change, and the upper energy absorbing block 11 and the lower energy absorbing block 7 are not compressed. Therefore, the present invention can match the thermal displacement of the pipeline throughout the process without generating dead band. When the pipeline appears impact load, the impact movement speed of the pipeline at the constraint point is greater than the locking speed of the hydraulic damper 1. At this time, the hydraulic damper 1 is in a near-rigid state, and the pipeline drags the action disk 9 and the locking disk 8 through the connecting rod 15 to compress the upper energy absorbing block 11 or the lower energy absorbing block 7. Specifically, when the impact displacement direction at the pipeline constraint point is away from the present invention, at this time the upper energy absorbing block 11 is compressed and the lower energy absorbing block 7 is not compressed; when the impact displacement direction at the pipeline constraint point is close to the present invention, at this time the lower energy absorbing block 7 is compressed and the upper energy absorbing block 11 is not compressed; when the upper energy absorbing block 11 or the lower energy absorbing block 7 undergoes plastic deformation under the compression of the action disk 9 and the locking disk 8, since the lower energy absorbing block 7 and the upper energy absorbing block 11 are made of metal foam material and have obvious stress plateau characteristics under compression, a constant force output can be realized during the compression process, so the function of constant force protection can be realized.

[0026] In addition, in the specific operation, the cross-sectional area and porosity of the upper energy absorbing block 11 and the lower energy absorbing block 7 are designed to ensure that the present invention outputs the same constant force characteristics under tension and compression. Specifically, the following should be satisfied: S1(1-ρ1) 1.5 =S2(1-ρ2) 1.5 , where S1 is the cross-sectional area of ​​the upper energy absorbing block 11 , ρ1 is the porosity of the upper energy absorbing block 11 , S2 is the cross-sectional area of ​​the lower energy absorbing block 7 , and ρ2 is the porosity of the lower energy absorbing block 7 .

[0027] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope introduced in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A protection device for pipeline impact resistance, characterized in that: It comprises a flange connecting rod (2), a hydraulic damper (1), a lower connecting plate of the energy absorber (5), a lower pressure plate of the energy absorber (6), a lower energy absorbing block (7), a locking plate (8), an actuating plate (9), an upper energy absorbing block (11), an upper pressure plate of the energy absorber (12), an energy absorber housing (13), a connecting rod (15) and an upper connecting plate of the energy absorber (14); One end of the flange connecting rod (2) is connected to the hydraulic damper (1), and the other end of the flange connecting rod (2) is connected to the lower connecting plate (5) of the energy absorber. The energy absorber lower pressure plate (6), the lower energy absorbing block (7), the locking plate (8), the actuating plate (9), the upper energy absorbing block (11) and the energy absorber upper pressure plate (12) are sequentially arranged in the energy absorber housing (13) from bottom to top, and the inner wall of the energy absorber housing (13) is provided with an annular first guide groove, a second guide groove and a third guide groove, wherein the energy absorber lower pressure plate (6), the actuating plate (9) and the energy absorber upper pressure plate (12) are all provided with guide bosses on the outer circumferences, wherein the guide bosses on the energy absorber lower pressure plate (6) are embedded in the first guide groove, and the actuating plate (9) is provided with a guide boss on the outer circumferences of the energy absorber lower pressure plate (6). The guide boss on the disc (9) is embedded in the second guide groove, the guide boss on the upper pressure plate (12) of the energy absorber is embedded in the third guide groove, and the end of the connecting rod (15) passes through the lower connecting plate (5) of the energy absorber, the upper pressure plate (12) of the energy absorber, the upper energy absorbing block (11), the action disc (9) and the locking disc (8) in sequence, wherein the connecting rod (15) is connected to the action disc (9) and the locking disc (8), the upper connecting plate (14) of the energy absorber is connected to the upper end of the energy absorber shell (13), and the lower connecting plate (5) of the energy absorber is connected to the energy absorber shell (13); The selected hydraulic damper low-speed walking resistance F1, the selected upper energy absorbing block crushing force F2, the selected lower energy absorbing block crushing force F3, and the selected damper rated load F4 satisfy the following relationship: F1 <F2=F3<F4; The cross-sectional area S1 and porosity ρ1 of the upper energy absorbing block, and the cross-sectional area S2 and porosity ρ2 of the lower energy absorbing block should satisfy the following relationship: S1(1-ρ1) 1.5 =S2(1-ρ2) 1.5 ; Since the lower energy absorbing block (7) and the upper energy absorbing block (11) are made of metal foam material, they have stress platform characteristics under compression and achieve constant force output during the compression process.

2. The protection device for pipeline impact resistance according to claim 1, characterized in that: The energy absorber shell (13) is provided with ventilation holes.

3. The protection device for pipeline impact resistance according to claim 1, characterized in that: The first pressure plate reset screw (31) passes through the lower connecting plate (5) of the energy absorber and contacts the lower pressure plate (6) of the energy absorber.

4. The protection device for pipeline impact resistance according to claim 3 is characterized in that: The second pressure plate reset screw (32) passes through the upper connection plate (14) of the energy absorber and contacts the upper pressure plate (12) of the energy absorber.

5. The protection device for pipeline impact resistance according to claim 1, characterized in that: The energy absorber shell (13) is connected to the upper connecting plate (14) and the lower connecting plate (5) of the energy absorber via connecting bolts (4).

6. The protection device for pipeline impact resistance according to claim 1, characterized in that: It also includes a displacement pointer (10). A slot is provided on the side of the energy absorber shell (13). The end of the displacement pointer (10) passes through the slot and is connected to the action disk (9). A scale line matching the displacement pointer (10) is provided on the side of the energy absorber shell (13).

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