Fuel gas pipeline butt joint device

Abstract

The utility model relates to gas equipment, in particular to a gas pipeline butt joint device which comprises a first barrel and a second barrel. The circular pipe section is sleeved at the butt joint end of the pipeline, and the circular truncated cone section at one end of the circular pipe section is provided with a radial screw hole and a puller screw which abut against the outer wall of the pipeline; the frustum section at the other end extends out of the flange, and the two barrels are fixedly connected through the axial through hole and a fastening bolt; an olive-type polyethylene sealing sleeve is arranged in the frustum section, and the outer surface of the olive-type polyethylene sealing sleeve abuts against the frustum section and the inner surface of the olive-type polyethylene sealing sleeve abuts against the outer wall of the gas pipeline. Compared with the prior art, an annular groove does not need to be formed, local stress concentration and strength reduction, caused by the annular groove, of the pipeline are avoided, the strength of the gas pipeline is guaranteed, and stable butt joint and good sealing are achieved through the structure.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas equipment, concretely is a kind of gas pipeline butt joint device. BACKGROUND

[0002] Gas pipeline must exist the scene needing butt joint: when carrying out new gas pipeline laying project, for example in newly-built community, commercial district or industrial area etc., newly laid pipeline needs to be butt joint with the existing gas main pipeline or branch pipeline of city, to realize the access and supply of gas. Gas pipeline can appear damage in use process due to corrosion, external damage, aging etc., need to repair or replace damaged part. At this time, new pipeline section needs to be butt joint with original undamaged pipeline, to restore the normal operation of pipeline. With the development of city and the increase of user demand, gas pipeline system can be expanded or reformed, such as increasing gas supply area, improving gas supply capacity. This needs to connect new pipeline or equipment on the basis of original pipeline system, carries out pipeline butt joint operation.

[0003] The utility model with publication number CN 218719464U discloses a kind of gas pipeline butt joint fixing device, mainly by pipeline butt joint component constitutes. The component includes first gas pipeline, second gas pipeline, lock position groove, thickened outer layer, external rotating ring and anti-skid boss etc., when carrying out pipeline butt joint operation, rotating external rotating ring makes inward extrusion ring to move, four embedded clamping plates are pushed into lock position groove simultaneously by means of inner and outer connecting rod. This multidirectional clamping structure can provide relatively stable connecting force to some extent, compared with some devices only relying on single direction hoop or simple connection mode, it has certain limiting effect in circumferential direction and axial direction, theoretically can effectively prevent pipeline relative displacement, with good butt joint firmness. However, there is certain defect: lock position groove is opened on gas pipeline, which can cause uneven local stress distribution of pipeline, under long-term pressure effect, stress concentration area is more prone to crack initiation and propagation, thereby reducing the overall strength and durability of pipeline. Opening annular groove makes wall thickness locally decrease, which can cause significant increase of hoop stress at this part, more easily reach the yield limit of material or even fracture limit, and then cause pipeline failure. UTILITY MODEL CONTENTS

[0004] In view of the above defects or one of the defects in the prior art, the utility model aims to provide a gas pipeline butt joint device without annular lock position groove through technical improvement and function optimization, and the technical scheme adopted is:

[0005] A kind of gas pipeline butt joint device, including first cylinder and second cylinder, it is characterized in that, first cylinder and second cylinder are mirror image symmetry, with the circular tube section of gap being set in the butt joint end of first gas pipeline or second gas pipeline, the thickened pipe wall of the one end of the circular tube section away from butt joint end forms circular truncated cone section, multiple radial screw holes are evenly set in the circular truncated cone section along the circumference, multiple jacking screws are connected with radial screw hole and abut on the outer wall of the first gas pipeline or second gas pipeline;The inner diameter of the one end of the circular tube section away from butt joint end gradually expands and forms frustum, the flange is formed by the outward expansion of the one end of the frustum, multiple axial through holes are evenly set on the flange along the circumference, multiple fastening bolts are passed through axial through hole and then the first cylinder and second cylinder are fixed together;Frustum of the first cylinder and second cylinder is built into olive-shaped polyethylene sealing sleeve, the outer surface of polyethylene sealing sleeve abuts with the frustum, and the inner surface abuts with the outer wall of the first gas pipeline or second gas pipeline.

[0006] Further, the length of the circular tube section and the frustum is greater than 10 cm.

[0007] Further, the taper of the corresponding side of the frustum and the polyethylene sealing sleeve is equal.

[0008] Further, the taper of the corresponding side of the frustum and the polyethylene sealing sleeve is 1:10 to 1:20.

[0009] Further, the length of the polyethylene sealing sleeve is less than 2 times the length of the frustum.

[0010] Further, the jacking screw is screwed with back nut.

[0011] Further, the inner and outer surfaces of the polyethylene sealing sleeve have silicone coating.

[0012] Further, the inner and outer surfaces of the polyethylene sealing sleeve have polytetrafluoroethylene layer.

[0013] Further, the inner and outer surfaces of the polyethylene sealing sleeve have polyurethane layer.

[0014] Further, the inner and outer surfaces of the polyethylene sealing sleeve have epoxy resin layer.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. Avoid the reduction of pipeline strength: without opening annular groove structure such as locking groove on the gas pipeline, the problems of stress concentration, wall thickness reduction, strength reduction of the pipeline under long-term pressure, crack initiation and expansion, even fracture failure and other problems caused by opening annular groove are overcome, the overall strength and durability of the gas pipeline are guaranteed, and the safety of gas transportation is ensured.

[0018] 2. Good connection stability: through the cooperation of the circular tube section, the circular cone section, the jacking screw, the conical section, the flange and the fastening bolt, the gas pipeline is effectively fixed. The circular tube section is sleeved on the pipeline butt joint end, the jacking screw of the circular cone section abuts against the outer wall of the pipeline, the flange connects the first cylinder and the second cylinder through the fastening bolt, the pipeline is limited and fixed from multiple directions, and the stability of the pipeline butt joint is guaranteed, and the relative displacement of the pipeline can be effectively prevented.

[0019] 3. Reliable sealing performance: the olive-shaped polyethylene sealing sleeve is arranged in the conical section of the first cylinder and the second cylinder, the inner and outer surfaces of the olive-shaped polyethylene sealing sleeve are in close abutment with the conical section and the outer wall of the gas pipeline respectively, a good sealing structure is formed, gas leakage is effectively prevented, and the sealing performance and safety of the gas conveying process are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 It is a structural schematic view of the utility model.

[0021] Fig. 2 It is a sectional view of the utility model. DETAILED DESCRIPTION

[0022] In the description of the utility model, it should be explained that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.

[0023] In the description of the utility model, it should be explained that unless otherwise specified and limited, the terms "installation", "connection", "communication" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0024] The following specific embodiments illustrate the embodiments of the present application, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosed content. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0025] As shown in Figs. 1-2 A gas pipeline butt joint device, comprising a first cylinder 100 and a second cylinder 200, the first cylinder 100 and the second cylinder 200 are mirror-symmetric, a circular tube segment 1 is sleeved on the butt joint end of a first gas pipeline 300 or a second gas pipeline 400, the end of the circular tube segment 1 away from the butt joint end is thickened to form a circular truncated cone segment 2, a plurality of radial screw holes are uniformly arranged on the circular truncated cone segment 2 in the circumferential direction, a plurality of jacking screws 3 are connected with the radial screw holes and abut on the outer wall of the first gas pipeline 300 or the second gas pipeline 400; the inner diameter of the end of the circular tube segment 1 relative to the butt joint end gradually expands to form a frustum segment 4, the end of the frustum segment 4 relative to the butt joint end expands outward to form a flange 5, a plurality of axial through holes are uniformly arranged on the flange 5 in the circumferential direction, and a plurality of fastening bolts 6 pass through the axial through holes and then fasten the first cylinder 100 and the second cylinder 200 together; the frustum segment 4 of the first cylinder 100 and the second cylinder 200 is embedded into an olive-shaped polyethylene sealing sleeve 500, the outer surface of the polyethylene sealing sleeve 500 abuts against the frustum segment 4, and the inner surface of the polyethylene sealing sleeve 500 abuts against the outer wall of the first gas pipeline 300 or the second gas pipeline 400.

[0026] Working principle: the butt joint and sealing of the gas pipeline are realized by the synergistic effect of the circular tube segment, the circular truncated cone segment, the jacking screw, the frustum segment, the flange, the fastening bolt and the polyethylene sealing sleeve. The circular tube segment provides basic support and preliminary positioning for the sleeving on the pipeline butt joint end; the jacking screw of the circular truncated cone segment is screwed through the radial screw hole to exert pressure on the outer wall of the pipeline and limit the displacement of the pipeline in the circumferential direction; the flange and the fastening bolt firmly connect the first cylinder and the second cylinder to ensure the stability of the overall structure and prevent axial separation; the frustum segment and the polyethylene sealing sleeve are tightly matched, rely on the elastic deformation of the sleeve to fill the gap between the pipeline and the cylinder, realize sealing and prevent gas leakage.

[0027] The butt joint process: first, the round pipe sections of the first and second cylinders are respectively sleeved on the butt joint ends of the first and second gas pipelines, ensuring proper position and a certain gap. Then, the jackscrews are screwed into the radial screw holes of the conical sections, so that they are uniformly pressed against the outer walls of the corresponding gas pipelines, fixing the pipelines and the cylinders. Then, the olive-shaped polyethylene sealing sleeve is accurately placed in the conical sections of the first and second cylinders, so that its inner and outer surfaces are in good contact with the conical sections and the outer walls of the gas pipelines respectively. Finally, the fastening bolts are used to pass through the axial through holes on the flanges, tightly fastening the first and second cylinders together, completing the butt joint operation of the gas pipeline and ensuring stable connection and good sealing.

[0028] In another preferred embodiment, the lengths of the round pipe sections 1 and the conical sections 4 are greater than 10 cm. Longer round pipe sections and conical sections can provide more sufficient contact area and support length. For the round pipe sections, longer length can better wrap and position the gas pipeline, making it less likely to deviate during installation, enhancing the installation positioning stability of the pipeline. For the conical sections, longer length can provide more sufficient accommodation space for the polyethylene sealing sleeve inside, which is conducive to the sealing function of the sealing sleeve, and when subjected to the internal pressure of the pipeline, it can better disperse the pressure, avoid local stress concentration, and prevent sealing failure. In the long-term use process, due to the longer length, the connection and sealing structure between the components are relatively dispersedly affected by the environment, reducing the risk of overall functional failure caused by local environmental factors (such as corrosion, wear, etc.), thereby improving the reliability and service life of the entire gas pipeline butt joint device.

[0029] In another preferred embodiment, the tapers of the corresponding sides of the conical sections 4 and the polyethylene sealing sleeve 500 are equal. When the tapers of the corresponding sides of the conical sections and the polyethylene sealing sleeve are equal, they can be tightly fitted. During installation, the sealing sleeve can better match the shape of the conical section, ensuring that the outer surface of the sealing sleeve is in uniform contact with the inner surface of the conical section, forming a continuous and stable sealing surface, reducing gaps caused by shape mismatch, and improving sealing effect. This equal taper design can ensure that the sealing pressure is evenly distributed at different positions, avoiding the situation of local sealing being too tight or too loose due to inconsistent taper, so that the sealing performance is more uniform and consistent, preventing gas leakage from weak pressure points.

[0030] In another preferred embodiment, the taper of the corresponding sides of the frustum section 4 and the polyethylene sealing sleeve 500 is 1:10 to 1:20. Within this range of taper, a certain taper can be guaranteed to achieve good sealing effect, and the installation will not be affected by too large or too small taper. Too large taper may cause the sealing sleeve to be difficult to install or easily damaged during installation, and too small taper may not be able to provide sufficient sealing force. The taper in this range allows the sealing sleeve to deform moderately under certain axial force during installation, closely fits the frustum section, and achieves better sealing effect. Different taper choices can be adjusted according to the specific gas pipeline pressure, size and use environment, so that the device can adapt to various working conditions and pipeline specifications, and has stronger universality and adaptability.

[0031] In another preferred embodiment, the length of the polyethylene sealing sleeve 500 is less than 2 times the length of the frustum section 4. Controlling the length of the sealing sleeve within a certain range can prevent excessive axial deformation during installation and use. If the sealing sleeve is too long, it may be compressed and deformed during installation, affecting its service life and sealing performance. This design ensures that the sealing sleeve works within a reasonable deformation range, maintains its elasticity and sealing performance. Ensuring a reasonable ratio of the length of the sealing sleeve to the length of the frustum section can avoid waste of materials, make the entire device structure more compact, save installation space, and facilitate use in various complex pipeline layout environments while ensuring sealing performance.

[0032] In another preferred embodiment, a back nut is screwed on the jacking screw 3. The back nut can lock the jacking screw to prevent it from loosening due to pipeline vibration, temperature change or other external factors during long-term use. Once the jacking screw loosens, it may cause the jacking force on the pipeline to decrease, affecting the fixing effect and sealing performance of the pipeline. Using a back nut can enhance the long-term stability of the connection. When the jacking screw needs to be adjusted or tightened again, the back nut can serve as an auxiliary positioning function, making it easier for workers to use tools to tighten the jacking screw, while avoiding damage to the jacking screw or pipeline due to excessive tightening, making maintenance more convenient.

[0033] In another preferred embodiment, the inner and outer surfaces of the polyethylene sealing sleeve 500 have a silicone coating. The silicone coating has low surface energy and good flexibility, which can reduce the coefficient of friction, so that the sealing sleeve can better adapt to pressure and deformation when in contact with the frustum section and the gas pipeline, reducing the risk of sealing failure due to friction and deformation. The silicone coating has excellent water repellency, which can effectively prevent water from adhering and penetrating the sealing surface. For gas pipelines that may be in a humid environment, it can improve the long-term effectiveness of the seal and reduce the decline in sealing performance due to moisture.

[0034] In another preferred embodiment, the inner and outer surfaces of the polyethylene sealing sleeve 500 have a layer of polytetrafluoroethylene. Polytetrafluoroethylene has a very low friction coefficient, which can reduce the friction of the sealing sleeve when the gas flows in the pipeline, reduce wear and tear, and prolong the service life of the sealing sleeve. At the same time, it can also prevent the sealing sleeve from being damaged due to friction when cooperating with the frustum section, and maintain the integrity of the sealing structure. It can prevent impurities, dust and other impurities in the gas from adhering to the surface of the sealing sleeve, ensure smooth flow of the gas and cleanliness of the sealing surface, and avoid damage to the sealing structure due to impurity accumulation.

[0035] In another preferred embodiment, the inner and outer surfaces of the polyethylene sealing sleeve 500 have a layer of polyurethane. Polyurethane has high elasticity and impact resistance, which can provide buffer protection for the sealing sleeve when the pipeline is impacted by external impact or internal pressure fluctuation, and prevent sealing failure due to impact. It can form a dense coating to prevent gas molecules from penetrating, has good sealing effect for small molecule gas, ensures the tightness of the sealing, and enhances the sealing performance.

[0036] In another preferred embodiment, the inner and outer surfaces of the polyethylene sealing sleeve 500 have a layer of epoxy resin. Epoxy resin can fill the small pores and uneven places on the surface of the sealing sleeve, form a smoother and more uniform sealing surface, reduce potential leakage channels, and improve the sealing effect. The adhesion of epoxy resin helps the sealing sleeve to be tightly combined with the frustum section and the gas pipeline, enhances the adhesion of the sealing sleeve under different working conditions, and ensures the firmness and reliability of the sealing structure.

[0037] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A gas pipeline butt joining device comprising a first cylinder (100) and a second cylinder (200), characterized in that, The first cylinder (100) and the second cylinder (200) are mirror-symmetrical, and have a circular tube segment (1) sleeved on the butt joint end of the first gas pipeline (300) or the second gas pipeline (400), one end of the circular tube segment (1) away from the butt joint end is thickened to form a circular truncated cone segment (2), a plurality of radial screw holes are uniformly arranged on the circular truncated cone segment (2) in the circumferential direction, and a plurality of jacking screws (3) are connected with the radial screw holes and abut on the outer wall of the first gas pipeline (300) or the second gas pipeline (400); the inner diameter of one end of the circular tube segment (1) away from the butt joint end is gradually expanded to form a frustoconical segment (4), the frustoconical segment (4) is expanded outward at one end away from the butt joint end to form a flange (5), a plurality of axial through holes are uniformly arranged on the flange (5) in the circumferential direction, and a plurality of fastening bolts (6) pass through the axial through holes to connect the first cylinder (100) and the second cylinder (200) together; the frustoconical segment (4) of the first cylinder (100) and the second cylinder (200) is embedded into an olive-shaped polyethylene sealing sleeve (500), the outer surface of the polyethylene sealing sleeve (500) abuts against the frustoconical segment (4), and the inner surface of the polyethylene sealing sleeve (500) abuts against the outer wall of the first gas pipeline (300) or the second gas pipeline (400).

2. A gas pipe butt joint apparatus according to claim 1, characterised in that The length of the circular tube segment (1) and the frustoconical segment (4) is greater than 10 cm.

3. A gas pipe butt joint apparatus according to claim 1, characterized in that The taper of the corresponding side of the frustoconical segment (4) and the polyethylene sealing sleeve (500) is equal.

4. A gas pipe butt joint apparatus according to claim 1, characterized in that The taper of the corresponding side of the frustoconical segment (4) and the polyethylene sealing sleeve (500) is 1:10 to 1:

20.

5. A gas pipe coupling device according to claim 1, wherein The length of the polyethylene sealing sleeve (500) is less than 2 times the length of the frustoconical segment (4).

6. A gas pipe coupling device according to claim 1, wherein A back-tightening nut is screwed on the jacking screw (3).

7. A gas pipe coupling device according to claim 1, wherein The inner and outer surfaces of the polyethylene sealing sleeve (500) have a silicone coating.

8. A gas pipe coupling device according to claim 1, wherein The inner and outer surfaces of the polyethylene sealing sleeve (500) have a polytetrafluoroethylene layer.

9. A gas pipe coupling device according to claim 1, wherein The inner and outer surfaces of the polyethylene sealing sleeve (500) have a polyurethane layer.

10. A gas pipe coupling device according to claim 1, wherein The inner and outer surfaces of the polyethylene sealing sleeve (500) have an epoxy resin layer.

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