Telescopic joint

Abstract

The utility model relates to the technical field of pipeline connection, in particular to an expansion joint, which is characterized in that a first shell is provided with a first flange, the first shell is fixedly connected with a fixed pipe, and the outer wall of the first shell is provided with a first lug; the second shell is provided with a second flange, and the first flange and the second flange are connected through bolts. The first shell and the second shell sleeve the outer wall of the sliding pipe; a second lug is arranged on the outer wall of the sliding pipe; a first annular groove is formed in the side, facing the second flange, of the first flange, a first sealing ring is arranged in the first annular groove, and the first sealing ring abuts against the second flange and the outer wall of the sliding pipe; a second annular groove is formed in the outer wall of the sliding pipe, a second sealing ring is arranged in the second annular groove, and the second sealing ring abuts against the inner wall of the first shell; a plurality of annular cavities are formed in the shell walls of the first shell and the second shell. The expansion joint is simple in structure, convenient to operate, reliable in sealing, convenient to transport and particularly suitable for connection of long-distance and large-caliber GRP pipelines and HDPE pipelines.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipeline connection technical field, especially a telescopic joint. BACKGROUND

[0002] The seawater cooling system is a kind of cooling system, which is connected with HDPE pipeline on one end of seawater pumping station and connected with GRP pipeline on one end of land side, and the seawater is pumped to land by seawater pumping station, for example, the industrial facilities such as oil refinery, which need to carry out a large amount of heat exchange, and then re-enter the ocean.

[0003] However, when the HDPE pipeline on the sea side and the GRP pipeline on the land side need to be connected, since the length of the pipeline in the entire cooling system is often long (≥1000m), the diameter of the pipeline is large (≥3000mm), and the two sections of HDPE pipeline and GRP pipeline to be connected cannot be installed at the same time, therefore, a telescopic joint is needed to compensate the longitudinal tolerance between the two sections of pipeline, and the existing telescopic joints are mostly corrugated telescopic joints, sleeve telescopic joints, square natural compensation telescopic joints and the like, which are small in diameter and cannot adapt to the connection of large-diameter pipelines, and the large telescopic joints have the problems of large self-weight, difficult transportation and poor sealing performance when connected with the pipelines at both ends of the telescopic joint, therefore, a telescopic joint suitable for large-diameter pipelines is urgently needed. SUMMARY

[0004] The utility model aims at overcoming the problems of large self-weight and poor sealing performance of the existing large-diameter telescopic joint, and provides a telescopic joint.

[0005] In the first aspect, the utility model provides a telescopic joint, which comprises a fixed pipe, a sliding pipe, a first shell, a second shell;

[0006] One end of the first shell is provided with a first flange, the first shell is fixedly connected with the fixed pipe, and the outer wall of the first shell is provided with a first lug;

[0007] One end of the second shell is provided with a second flange, and the first flange and the second flange are connected by bolts;

[0008] The first shell and the second shell are sleeved on the outer wall of the sliding pipe, and the first shell and the second shell are slidingly connected with the sliding pipe, and the outer wall of the sliding pipe is provided with a second lug;

[0009] The side of the first flange facing the second flange is provided with a first annular groove with an L-shaped cross section, a first sealing ring is arranged in the first annular groove, the first sealing ring abuts against the second flange, and the first sealing ring abuts against the outer wall of the sliding pipe;

[0010] The outer wall of the sliding pipe is provided with a second annular groove, and a second sealing ring is arranged in the second annular groove and abuts against the inner wall of the first shell.

[0011] The shell wall of the first shell and the second shell is provided with a plurality of annular cavities.

[0012] The sliding pipe of the telescopic joint can slide in the first shell and the second shell, thereby realizing large axial compensation and overcoming the installation tolerance problem of the large-diameter pipeline. When it is necessary to adjust the position of the sliding pipe, the sliding pipe can be moved only by loosening the connection of the first flange and the second flange. When the sliding pipe is adjusted to the position, the bolt connecting the first flange and the second flange is tightened. Since the cross section of the first annular groove is L-shaped, that is, the cross section of the first annular groove has two edges in communication with the outer wall of the second flange and the sliding pipe, the first flange and the second flange are clamped and press the first sealing ring in the first annular groove, so that the first sealing ring abuts against the inner wall of the first annular groove, the second flange and the outer wall of the sliding pipe, thereby realizing sealing and improving the sealing performance of the telescopic joint. The second annular groove on the outer wall of the sliding pipe cooperates with the second sealing ring, and the second sealing ring is attached to the inner wall of the first shell, thereby further improving the sealing performance. The double-layer sealing structure ensures that the telescopic joint can effectively prevent leakage in the application environment of high pressure and large diameter, and improves the sealing reliability. The plurality of annular cavities arranged in the shell wall of the first shell and the second shell can effectively reduce the weight of the telescopic joint, and facilitate the transportation and hoisting of the telescopic joint.

[0013] The first lug and the second lug are arranged on the first shell and the second shell. When it is necessary to move the sliding pipe, the rope or the chain hoist can be connected with the lugs to conveniently move the sliding pipe. When it is necessary to hoist the telescopic joint, the first lug and the second lug provide a lifting point for hoisting, thereby facilitating the movement of the telescopic joint. When it is necessary to transport the telescopic joint, the first lug and the second lug can be locked by the rope or the chain to prevent the telescopic joint from being damaged or the sealing from being invalid due to improper movement of the sliding pipe during transportation.

[0014] The telescopic joint provided by the utility model has the advantages of simple structure, convenient operation, reliable sealing, convenient transportation and the like, and is particularly suitable for the connection of long-distance and large-diameter GRP pipelines and HDPE pipelines.

[0015] Preferably, a plurality of annular cavities are arranged in the pipe wall of the fixed pipe and the sliding pipe.

[0016] By adopting the structure, the introduction of the annular cavities significantly reduces the overall weight of the fixed pipe and the sliding pipe, reduces the material usage amount under the premise of ensuring the structural strength, and thereby reduces the dead weight. After the arrangement, the telescopic joint is more convenient to transport and install, and has higher adaptability, especially for the connection of large-diameter and long-distance pipelines, and the demand for hoisting and supporting equipment is reduced.

[0017] Preferably, the outer wall of the first shell is provided with at least two first lugs which are evenly distributed along the circumference of the first shell; the outer wall of the sliding tube is provided with at least two second lugs which are evenly distributed along the circumference of the sliding tube.

[0018] With this structural arrangement, the evenly distributed first lugs and second lugs can evenly distribute the force during installation and adjustment, avoiding the problem of structural tilt or imbalance caused by unilateral force.

[0019] Preferably, the number of first lugs and second lugs is three each, and the angle between two adjacent first lugs is 120°; the angle between two adjacent second lugs is 120°.

[0020] With this structural arrangement, a lug is arranged every 120°, which can evenly distribute the applied external force in the entire telescopic joint, avoiding deflection or stress concentration caused by excessive local force. This design makes the moment distribution more balanced during installation, adjustment or hoisting.

[0021] Preferably, the two sides of the first lug are provided with a support plate which connects the first lug and the outer wall of the first shell; the two sides of the second lug are provided with the support plate which connects the second lug and the outer wall of the sliding tube.

[0022] With this structural arrangement, the support plate can firmly connect the lug and the tube wall, effectively dispersing and transmitting the tension, pressure and torque applied on the lug, reducing the stress concentration of the lug alone. Especially during hoisting, installation or adjustment, the support plate structure can enhance the stability of the connection, avoiding deformation or damage caused by excessive local force.

[0023] Preferably, the fixed tube is provided with a third flange at the end away from the first shell, and the sliding tube is provided with a fourth flange at the end outside the second shell.

[0024] By providing the third flange and the fourth flange, the telescopic joint can be conveniently connected with the HDPE pipe or GRP pipe to be connected at both ends, improving the connection efficiency and stability.

[0025] Preferably, the first sealing ring and the second sealing ring are both rubber sealing rings.

[0026] Rubber material has good flexibility and plasticity, which can tightly adhere to the surface of adjacent components under pressure, filling the small gap, thereby achieving efficient sealing. Rubber also has excellent corrosion resistance, and the seawater cooling system often faces a strong corrosive environment. Rubber material has excellent corrosion resistance and can resist the corrosion of seawater, chemicals and other corrosive media, maintaining the long-term stability of the sealing performance.

[0027] Preferably, the fixed pipe, the sliding pipe, the first shell, the second shell are all HDPE structural parts; the bolt is a GRP bolt.

[0028] With this structural arrangement, the HDPE structural parts and the GRP structural parts have low density, reducing the weight of the whole expansion joint, facilitating on-site installation and transportation; the HDPE structural parts and the GRP structural parts have excellent corrosion resistance and are not easily affected by seawater and common chemical corrosives, being particularly suitable for cooling systems that are exposed to saltwater environments for a long time, effectively resisting corrosion in humid and high-salt environments, thereby improving the durability of the expansion joint.

[0029] Preferably, the fixed pipe, the sliding pipe, the first shell, the second shell, the third flange, the fourth flange are all HDPE structural parts; the bolt is a GRP bolt.

[0030] Preferably, further comprising a connecting cable, the connecting cable connecting adjacent first lugs and second lugs, the connecting cable being detachably connected with the first lugs and the second lugs.

[0031] With this structural arrangement, when the expansion joint needs to be transported, the connecting cable can be used to fix the first lugs and the second lugs, preventing uncontrolled displacement of the structure of the expansion joint in the transportation vibration, effectively protecting the stability and sealing of each component of the expansion joint, thereby reducing the risk of transportation damage; when the expansion joint needs to be used, only the connecting cable needs to be detached, so that the length of the expansion joint can be quickly adjusted, improving the use convenience of the expansion joint.

[0032] Compared with the prior art, the utility model has the advantages of:

[0033] 1. The expansion joint provided by the utility model, the sliding pipe can slide in the first shell and the second shell, thereby realizing large axial compensation and overcoming the installation tolerance problem of large-diameter pipelines. When the position of the sliding pipe needs to be adjusted, the sliding pipe can be moved only by loosening the connection of the first flange and the second flange, and when the position of the sliding pipe is adjusted in place, the bolt connecting the first flange and the second flange is tightened. Since the cross section of the first annular groove is L-shaped, that is, the cross section of the first annular groove has two edges in communication with the outer wall of the second flange and the sliding pipe, the first flange and the second flange are clamped and press the first sealing ring in the first annular groove, forcing the first sealing ring to tightly abut against the inner wall of the first annular groove, the second flange and the outer wall of the sliding pipe, thereby realizing sealing and improving the sealing performance of the expansion joint. The second annular groove on the outer wall of the sliding pipe cooperates with the second sealing ring, and the second sealing ring abuts against the inner wall of the first shell, further enhancing the sealing performance. This double-layer sealing structure ensures that the expansion joint can effectively prevent leakage in the application environment of high pressure and large diameter, thereby improving the sealing reliability.

[0034] 2. The telescopic joint provided by the utility model, a plurality of annular cavities arranged in the shell wall of the first shell and the second shell can effectively reduce the weight of the telescopic joint, and facilitate the transportation and hoisting of the telescopic joint;

[0035] 3. The telescopic joint provided by the utility model, lugs are arranged on the first shell and the second shell, when the sliding pipe needs to be moved, the lugs can be connected with the ropes or the chain hoists, so that the sliding pipe is conveniently moved; when the telescopic joint needs to be hoisted, the first lug and the second lug provide a hoisting point, so that the telescopic joint is conveniently moved; when the telescopic joint needs to be transported, the first lug and the second lug can be locked by the ropes or the chains, so that the telescopic joint is prevented from being damaged or the seal from being lost due to improper movement of the sliding pipe during the transportation;

[0036] 4. The telescopic joint provided by the utility model is simple in structure, convenient to operate, reliable in sealing, convenient to transport, and particularly suitable for the connection of long-distance and large-diameter GRP pipelines and HDPE pipelines. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 It is a front view of the telescopic joint;

[0038] Figure 2 It is a sectional view of the telescopic joint;

[0039] Figure 3 It is Figure 2 an enlarged view of the A part;

[0040] Figure 4 It is Figure 3 a schematic view of the first flange structure;

[0041] Figure 5 It is Figure 2 an enlarged view of the B part;

[0042] Figure 6 It is a sectional view of the telescopic joint;

[0043] Figure 7 It is a sectional view of the second lug.

[0044] Markings in the drawing:

[0045] 1 - fixed pipe, 11 - third flange, 2 - sliding pipe, 21 - second annular groove, 22 - fourth flange, 31 - first shell, 311 - first flange, 312 - first annular groove, 32 - second shell, 321 - second flange, 41 - first lug, 42 - second lug, 51 - first sealing ring, 52 - second sealing ring, 6 - annular cavity, 7 - bolt, 8 - support plate, 9 - connecting rope. DETAILED DESCRIPTION

[0046] The utility model will be described in further detail below in combination with specific embodiments. However, this should not be understood as limiting the scope of the above-mentioned subject matter of the utility model to the following embodiments only, and any technology realized based on the content of the utility model falls within the scope of the utility model.

[0047] In the description of the embodiments of the utility model, the terms indicating the orientation or position relationship of "up", "down", "left", "right", "center", "inner", "outer", etc. are expressed based on the orientation or position relationship shown in the drawings, or the orientation or position relationship when the product / equipment / device of the utility model is usually used. These terms of orientation or position relationship are only used to facilitate the description of the utility model scheme or simplify the description in the embodiments, so as to enable the skilled person to quickly understand the scheme, and therefore cannot be understood as indicating or implying that a specific device / component / element must have a specific orientation or be constructed and operated in a specific position relationship, and therefore cannot be understood as limiting the utility model.

[0048] In addition, the terms "horizontal", "vertical", "overhanging", "parallel", etc. do not mean that the corresponding device / component / element must be absolutely horizontal or vertical or overhanging or parallel, but can be slightly inclined or deviated. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. Alternatively, it can be simplified to mean that the corresponding device / component / element is arranged in the direction of "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction, more preferably an error / deviation of ±8% or less, more preferably an error / deviation of ±6% or less, more preferably an error / deviation of ±5% or less, and more preferably an error / deviation of ±4% or less. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the utility model.

[0049] In addition, the terms "first", "second", "third", etc. in the terms are only used to distinguish the description of the same or similar components, and should not be understood as emphasizing or implying the relative importance of the specific components.

[0050] In addition, in the description of the embodiments of the utility model, "several", "a plurality of", "several" represent at least 2. It can be 2, 3, 4, 5, 6, 7, 8, 9, etc. in any case, or even more than 9.

[0051] Furthermore, in the description of the technical solutions of the utility model, unless otherwise explicitly specified / limited / limited, the terms "provided", "installed", "connected", "connected", "provided", "laid", "arranged" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected, which can be welding, riveting, bolting, screwing and other commonly used connection means in the art. The connection can be mechanical connection, electrical connection or communication connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be connected inside two elements.

[0052] HDPE pipe is a kind of pipe made of high density polyethylene (English name "High Density Polyethylene", abbreviated as "HDPE").

[0053] GRP pipe is a kind of glass fiber reinforced resin plastic pipe (English name "Glass-reinforced plastics").

[0054] Embodiment 1

[0055] When the sea side HDPE pipeline and the land side GRP pipeline need to be connected, because the diameter of the HDPE pipeline and the GRP pipeline is large (≥3000mm), the pipeline extension distance is long (≥1000m), when the two pipelines need to be connected, it is often impossible to install at the same time, at this time, the expansion joint provided by the embodiment can be used.

[0056] Specifically, as shown in Figures 1-6 The embodiment provides an expansion joint, which comprises a fixed pipe 1, a sliding pipe 2, a first shell 31, a second shell 32.

[0057] One end of the first shell 31 is provided with a first flange 311, and the first shell 31 is fixedly connected with the fixed pipe 1 (for example Figure 2 As shown, one end of the fixed pipe 1 can be welded with the end of the first shell 31 away from the first flange 311 through hot melting), and the outer wall of the first shell 31 is provided with a first lug 41.

[0058] One end of the second shell 32 is provided with a second flange 321, and the first flange 311 and the second flange 321 are connected through bolts 7.

[0059] The first shell 31 and the second shell 32 are sleeved on the outer wall of the sliding pipe 2, and the first shell 31 and the second shell 32 are slidably connected with the sliding pipe 2. The outer wall of the sliding pipe 2 is provided with a second lug 42.

[0060] As Figure 3 , Figure 4As shown, the first flange 311 is provided with a first annular groove 312 with an L-shaped cross section on the side facing the second flange 321, that is, the first annular groove 312 is open on the side facing the sliding pipe 2 and on the side facing the second flange 321. A first sealing ring 51 is arranged in the first annular groove 312, and the first sealing ring 51 abuts against the second flange 321 and the outer wall of the sliding pipe 2;

[0061] The outer wall of the sliding pipe 2 is provided with a second annular groove 21, and a second sealing ring 52 is arranged in the second annular groove 21, and the second sealing ring 52 abuts against the inner wall of the first outer shell 31; for example, Figure 5 As shown, the opening of the second annular groove 21 faces the direction of the first outer shell 31.

[0062] As shown, Figures 3-5 The shell wall of the first outer shell 31 and the second outer shell 32 is provided with a plurality of annular cavities 6.

[0063] Further, as shown, Figure 2 In this embodiment, a plurality of annular cavities 6 are also arranged in the pipe wall of the fixed pipe 1 and the sliding pipe 2. By adopting this structure, the introduction of the annular cavities 6 significantly reduces the overall weight of the fixed pipe 1 and the sliding pipe 2, reduces the material usage under the premise of ensuring the structural strength, and thus reduces the dead weight. After such arrangement, the expansion joint is more portable during transportation and installation, and has better adaptability, especially for large-diameter and long-distance pipe connections, reducing the demand for hoisting and supporting equipment.

[0064] Further, as shown, Figure 1 , Figure 2 , Figure 6 The outer wall of the first outer shell 31 is provided with at least two first lugs 41, and the first lugs 41 are uniformly distributed along the circumference of the first outer shell 31; the outer wall of the sliding pipe 2 is provided with at least two second lugs 42, and the second lugs 42 are uniformly distributed along the circumference of the sliding pipe 2. The uniformly distributed first lugs 41 and second lugs 42 can uniformly distribute the applied external force during installation and adjustment, avoiding the problem of structural inclination or imbalance caused by unilateral force.

[0065] Preferably, the number of first lugs 41 and second lugs 42 is three respectively, and the angle between adjacent two first lugs 41 is 120°; the angle between adjacent two second lugs 42 is 120°. Arranging a lug every 120° can uniformly distribute the applied external force in the entire circumference of the expansion joint, avoiding deflection or stress concentration caused by excessive local force. This design makes the moment distribution during installation, adjustment or hoisting more balanced.

[0066] Further, as shown, Figure 1 , Figure 2 , Figure 6As shown, the fixed pipe 1 is provided with a third flange 11 at one end away from the first shell 31, and the sliding pipe 2 is provided with a fourth flange 22 at one end outside the second shell 32. By providing the third flange 11 and the fourth flange 22, the telescopic joint can be conveniently connected with the HDPE pipe or the GRP pipe to be connected at both ends, thereby improving the connection efficiency and stability.

[0067] The sliding pipe 2 of the telescopic joint provided by the embodiment can slide in the first shell 31 and the second shell 32, thereby achieving a large axial compensation and overcoming the installation tolerance problem of the large-diameter pipe. When it is necessary to adjust the position of the sliding pipe 2, the sliding pipe 2 can be moved only by loosening the connection of the first flange 311 and the second flange 321. When the sliding pipe 2 is adjusted to the right position, the bolt 7 connecting the first flange 311 and the second flange 321 is tightened. Since the cross section of the first annular groove 312 is L-shaped, i.e., the cross section of the first annular groove 312 has two edges in communication with the outer wall of the second flange 321 and the sliding pipe 2, the first flange 311 and the second flange 321 are clamped and pressed into the first annular groove 312, thereby forcing the first sealing ring 51 to be tightly attached to the inner wall of the first annular groove 312, the second flange 321 and the outer wall of the sliding pipe 2, so as to achieve sealing and improve the sealing performance of the telescopic joint. The second annular groove 21 on the outer wall of the sliding pipe 2 cooperates with the second sealing ring 52, and the second sealing ring 52 is attached to the inner wall of the first shell 31, thereby further enhancing the sealing performance. The double-layer sealing structure ensures that the telescopic joint can effectively prevent leakage in the application environment of high pressure and large diameter, thereby improving the sealing reliability.

[0068] The first flange (311) and the second flange (321) of the telescopic joint are tightened to complete the compression of the first sealing ring 51 to achieve sealing, but cannot provide axial resistance. Therefore, the telescopic joint of the embodiment can be immediately poured with concrete after installation to prevent accidental movement of the pipe.

[0069] The plurality of annular cavities 6 arranged in the shell wall of the first shell 31 and the second shell 32 can effectively reduce the weight of the telescopic joint, thereby facilitating the transportation and hoisting of the telescopic joint.

[0070] The first lug 41 and the second lug 42 are arranged on the first shell 31 and the second shell 32, respectively. When it is necessary to move the sliding pipe 2, the first lug 41 and the second lug 42 can be connected with a rope or a chain hoist, thereby facilitating the movement of the sliding pipe 2. When it is necessary to hoist the telescopic joint, the first lug 41 and the second lug 42 provide a lifting point for hoisting, thereby facilitating the movement of the telescopic joint. When it is necessary to transport the telescopic joint, the first lug 41 and the second lug 42 can be locked by a rope or a chain to prevent the telescopic joint from being damaged or the sealing from being ineffective due to the improper movement of the sliding pipe 2 during transportation.

[0071] The telescopic joint structure provided by the utility model is simple in structure, convenient to operate, reliable in sealing, convenient to transport, and particularly suitable for connecting long-distance and large-diameter GRP pipelines and HDPE pipelines.

[0072] Embodiment 2

[0073] In this embodiment, the two sides of the first lug 41 are provided with a support plate 8, the support plate 8 connects the first lug 41 and the outer wall of the first shell 31; the two sides of the second lug 42 are provided with a support plate 8, the support plate 8 connects the second lug 42 and the outer wall of the sliding pipe 2.

[0074] Specifically, for example Figure 7 As shown in the partial view of the second lug 42, the support plate 8 is located on the left and right sides of the second lug 42, and the support plate 8 can be triangular in structure.

[0075] With this structure, the support plate 8 can firmly connect the lug and the pipe wall, effectively disperse and transfer the tension, pressure and torque applied on the lug, and reduce the stress concentration of the lug alone. In particular, during hoisting, installation or adjustment, the support plate 8 structure can enhance the stability of the connection, and avoid deformation or damage caused by excessive local stress.

[0076] Embodiment 3

[0077] In this embodiment, the fixed pipe 1, the sliding pipe 2, the first shell 31, the second shell 32, the third flange 11 and the fourth flange 22 are all HDPE structural parts; the bolt 7 is a GRP bolt; the first sealing ring 51 and the second sealing ring 52 are both rubber sealing rings, and specifically, chloroprene rubber sealing rings, nitrile rubber sealing rings, fluororubber sealing rings and the like commonly used in industrial production can be used.

[0078] With this structure, the HDPE structural parts and the GRP structural parts have low density, reducing the weight of the entire telescopic joint and facilitating on-site installation and transportation; the HDPE structural parts and the GRP structural parts have excellent corrosion resistance and are not easily affected by seawater and common chemical corrosion agents, and are particularly suitable for cooling systems that are exposed to saltwater environments for a long time, can effectively resist corrosion in humid and high-salt environments, and thus improve the durability of the telescopic joint. Rubber material has good flexibility and plasticity, can tightly adhere to the surface of adjacent components under pressure, and can fill small gaps, thereby achieving efficient sealing. Rubber also has excellent corrosion resistance, and seawater cooling systems often face strong corrosive environments, and rubber materials have excellent corrosion resistance and can resist the corrosion of corrosive media such as seawater and chemicals, maintaining the long-term stability of the sealing performance.

[0079] Embodiment 4

[0080] For example Figure 1As shown, on the basis of Embodiment 1, the telescopic joint in the present embodiment further comprises a connecting rope 9 connecting the adjacent first lug 41 and second lug 42, and the connecting rope 9 is detachably connected with the first lug 41 and the second lug 42. Specifically, the connecting rope 9 can be a commonly used rope in industry such as nylon fiber rope, steel wire rope, etc. When the telescopic joint needs to be transported, the first lug 41 and the second lug 42 can be fixed by using the connecting rope 9 to prevent the structure of the telescopic joint from producing uncontrollable displacement in the transportation vibration, effectively protecting the stability and sealing of each component of the telescopic joint, thereby reducing the risk of transportation damage; when the telescopic joint needs to be used, only the connecting rope 9 needs to be detached, and the length of the telescopic joint can be quickly adjusted, improving the use convenience of the telescopic joint.

[0081] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An expansion joint, characterized in that: It comprises a fixed tube (1), a sliding tube (2), a first shell (31), and a second shell (32); A first flange (311) is provided at one end of the first shell (31), the first shell (31) is fixedly connected to the fixed pipe (1), and a first lug (41) is provided on the outer wall of the first shell (31); A second flange (321) is provided at one end of the second housing (32), and the first flange (311) and the second flange (321) are connected by bolts (7); The first shell (31) and the second shell (32) are sleeved on the outer wall of the sliding tube (2), the first shell (31) and the second shell (32) are slidably connected to the sliding tube (2), and a second lug (42) is provided on the outer wall of the sliding tube (2); A first annular groove (312) with an L-shaped cross section is provided on one side of the first flange (311) facing the second flange (321), a first sealing ring (51) is provided in the first annular groove (312), the first sealing ring (51) abuts against the second flange (321), and the first sealing ring (51) abuts against the outer wall of the sliding tube (2); A second annular groove (21) is provided on the outer wall of the sliding tube (2), a second sealing ring (52) is provided in the second annular groove (21), and the second sealing ring (52) abuts against the inner wall of the first shell (31); A plurality of annular cavities (6) are provided in the shell walls of the first shell (31) and the second shell (32).

2. The expansion joint according to claim 1, characterized in that: A plurality of annular cavities (6) are provided in the walls of the fixed tube (1) and the sliding tube (2).

3. The expansion joint according to claim 1, characterized in that: At least two first lugs (41) are provided on the outer wall of the first shell (31), and the first lugs (41) are evenly distributed along the circumference of the first shell (31); and at least two second lugs (42) are provided on the outer wall of the sliding tube (2), and the second lugs (42) are evenly distributed along the circumference of the sliding tube (2).

4. The expansion joint according to claim 3, characterized in that: The number of the first lugs (41) and the number of the second lugs (42) are three, respectively. The angle between two adjacent first lugs (41) is 120°; the angle between two adjacent second lugs (42) is 120°.

5. The expansion joint according to claim 1, characterized in that: Support plates (8) are provided on both sides of the first lug (41), and the support plates (8) connect the first lug (41) and the outer wall of the first shell (31); support plates (8) are provided on both sides of the second lug (42), and the support plates (8) connect the second lug (42) and the outer wall of the sliding tube (2).

6. The expansion joint according to claim 1, characterized in that: A third flange (11) is provided at one end of the fixed tube (1) away from the first shell (31), and a fourth flange (22) is provided at one end of the sliding tube (2) located outside the second shell (32).

7. The expansion joint according to claim 1, characterized in that: The first sealing ring (51) and the second sealing ring (52) are both rubber sealing rings.

8. The expansion joint according to claim 1, characterized in that: The fixed tube (1), the sliding tube (2), the first shell (31), and the second shell (32) are all HDPE structural parts; and the bolts (7) are GRP bolts.

9. The expansion joint according to claim 6, characterized in that: The fixed pipe (1), the sliding pipe (2), the first shell (31), the second shell (32), the third flange (11), and the fourth flange (22) are all HDPE structural parts; the bolts (7) are GRP bolts.

10. The expansion joint according to claim 1, characterized in that: It also includes a connecting rope (9), which connects the adjacent first lug (41) and the second lug (42), and the connecting rope (9) is detachably connected to the first lug (41) and the second lug (42).

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