Replaceable combined sulfur-resistant pipe

Abstract

The replaceable combined sulfur-resistant pipe is formed by mutually splicing a plurality of minimum connecting units, the minimum connecting unit comprises an outer pipe, a sulfur-resistant replacement pipe, a connecting piece and a sealing ring; limiting thread grooves are formed in the two ends of the outer pipe. A limiting ring is arranged on the outer surface, close to one end, of the sulfur-resistant replacement pipe; first external threads matched with the limiting thread grooves are arranged outside the two ends of the connecting piece; the sulfur-resistant replacement pipe is sleeved with the outer pipe, the limiting ring is clamped in the limiting threaded groove, the first external thread of the connecting piece is connected with the limiting threaded groove clamped with the limiting ring in a matched mode, and the sealing ring is arranged in the connecting piece and attached to the end face of the sulfur-resistant replacement pipe. The utility model has the advantages that the outer pipe and the sulfur-resistant replacement pipe are high in rigidity and strength, the mechanical strength is high, the manufacturing cost is low, and the disassembly and the maintenance are convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of anti-sulfur pipelines, and specifically refers to a replaceable combined anti-sulfur pipe. Background Art

[0002] Anti-sulfur pipes are pipes that are resistant to hydrogen sulfide corrosion. In the production of petrochemicals, coal chemicals, coal gas and fertilizers, it is often encountered that the medium contains hydrogen sulfide and other sulfides. Targetedly, anti-sulfur pipes reduce the content of elements C, S, and P to enhance the corrosion resistance of the pipeline. However, when the content of hydrogen sulfide and other sulfides in the transport medium is high, the transport medium layer that is in direct contact with the medium, that is, the anti-sulfur layer, must be a polymer plastic with good anti-sulfur effect, such as polybutene or anti-sulfur composite plastic.

[0003] Plastic pipes have the advantages of being smooth, corrosion-resistant, and wear-resistant, but their rigidity and compressive resistance are relatively weak. At present, the steel-framed plastic composite pipes that are widely used in my country still have the following two major disadvantages: ① Although the steel-framed plastic composite pipe uses a steel frame to enhance its structural strength, its rigidity is still poor compared to the direct use of metal pipes, and it may bend and deform under the action of gravity, which poses a safety hazard; ② The cost is high. Since the raw materials of the steel-framed plastic composite pipe use both metal and plastic materials, compared with the plastic pipe without a frame, special production equipment and technology are required, such as plastic extruders, wire mesh winding machines, etc., and the cost of raw materials and production processes is high. At the same time, the price of sulfur-resistant composite plastics is more than three times that of ordinary polyethylene plastics, and in terms of technology, steel-framed plastic composite pipes usually use a single plastic and steel frame for compounding. If all sulfur-resistant composite plastics are used, the cost is high. Summary of the invention

[0004] The technical problem to be solved by the utility model is to design a replaceable combined anti-sulfur tube, which has an outer tube with high rigidity and an anti-sulfur replacement tube, and has the advantages of high mechanical strength, low manufacturing cost and convenient disassembly and maintenance.

[0005] The utility model is achieved in this way:

[0006] A replaceable combined anti-sulfur pipe comprises: a plurality of minimum connection units spliced ​​together;

[0007] The minimum connection unit includes: an outer tube, an anti-sulfur replacement tube, a connector and a sealing ring;

[0008] Limiting thread grooves are provided inside the two ends of the outer tube;

[0009] A limiting ring is provided on the outer surface of the anti-sulfur replacement tube near one end;

[0010] The two ends of the connecting member are provided with first external threads matching the limiting thread groove;

[0011] The anti-sulfur replacement tube is sleeved into the outer tube, the limiting ring is clamped in the limiting thread groove, the first external thread of the connecting piece is matched and connected with the limiting thread groove clamped with the limiting ring, and the sealing ring is arranged in the connecting piece and fits with the end face of the anti-sulfur replacement tube.

[0012] Furthermore, the anti-sulfur replacement tube comprises: an outer plastic layer and an inner anti-sulfur layer.

[0013] Furthermore, the thickness of the anti-sulfur layer is 5 mm.

[0014] Furthermore, the outer tube is a steel tube.

[0015] Furthermore, the limiting ring is provided with a second external thread matching the limiting thread groove.

[0016] Furthermore, a groove is formed on the edge of the limiting ring, and a protrusion matching the limiting thread groove is provided on the limiting thread groove to limit the rotation of the anti-sulfur replacement tube.

[0017] The advantages of the utility model are: since the structural design of outer tube plus inner tube is adopted and the outer tube is a steel tube, which provides necessary structural support, the overall rigidity and pressure resistance of the pipeline are enhanced, and it is particularly suitable for large-span installation scenarios; since the anti-sulfur replacement tube design is adopted, the anti-sulfur replacement tube can be made of plastic and anti-sulfur plastic composite, and there is no need to use anti-sulfur plastic alone, so the cost of the overall pipeline is reduced, and when the anti-sulfur layer or the plastic layer is damaged, only the damaged part needs to be replaced, and there is no need to replace the entire pipeline system, saving maintenance costs; since the design of the connecting piece threaded connection extrusion sealing ring is adopted, not only the sealing of the pipeline is guaranteed, but also the structural strength of the connection is enhanced; since the design of the limit ring with grooves or threads is adopted, the rotation of the anti-sulfur replacement tube in the outer tube is further limited, avoiding pipeline wear caused by the rotation of the anti-sulfur replacement tube due to factors such as pipeline vibration, thereby extending the service life of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the embodiments with reference to the accompanying drawings.

[0019] Figure 1 This is a split diagram of the minimum connection unit of the utility model.

[0020] Figure 2 It is a schematic diagram of the splicing state of two minimum connection units of the utility model.

[0021] Figure 3 It is a top view of the splicing state of two minimum connection units of the utility model.

[0022] Figure 4It is an AA cross-sectional view of the utility model in the splicing state of two minimum connection units.

[0023] Figure 5 It is an end face cross-sectional view of the anti-sulfur replacement pipe of the utility model (the limiting ring is provided with a groove).

[0024] Reference numerals:

[0025] 1-outer tube, 11-limiting thread groove, 2-anti-sulfur replacement tube, 21-limiting ring, 211-groove, 22-plastic layer, 23-anti-sulfur layer, 3-connecting piece, 31-first outer thread, 4-sealing ring. DETAILED DESCRIPTION

[0026] like Figures 1 to 4 As shown, a replaceable combined anti-sulfur pipe comprises: a plurality of minimum connection units spliced ​​together;

[0027] The minimum connection unit includes: an outer tube 1, an anti-sulfur replacement tube 2, a connection piece 3 and a sealing ring 4;

[0028] The two ends of the outer tube 1 are provided with limiting thread grooves 11;

[0029] The outer diameter of the anti-sulfur replacement pipe 2 is the same as the inner diameter of the outer pipe 1, and a limiting ring 21 is provided on the outer surface near one end thereof, and the limiting ring 21 is integrally formed with the anti-sulfur replacement pipe 2;

[0030] The two ends of the connector 3 are provided with first external threads 31 matching the limiting thread groove 11, and the inner diameter of the connector 3 is the same as the outer diameter of the sulfur-resistant replacement pipe 2;

[0031] The anti-sulfur replacement pipe 2 is sleeved into the outer pipe 1, the limiting ring 21 is clamped in the limiting thread groove 11, the first external thread 31 of the connector 3 is matched and connected with the limiting thread groove 11 of the outer pipe 1 clamped with the limiting ring 21, and the sealing ring 4 is arranged in the connector 3 and fits with the end face of the anti-sulfur replacement pipe 2. When splicing, the first external thread 31 of the connector 3 of the latter minimum connection unit is matched and connected with the limiting thread groove 11 of the outer pipe 1 of the former minimum connection unit that is not clamped with the limiting ring 21. The front and rear of the sealing ring 4 are both pressed by the anti-sulfur replacement pipe 2 to achieve pipeline sealing.

[0032] In this embodiment, the sulfur-resistant replacement pipe 2 includes: an outer plastic layer 22 and an inner sulfur-resistant layer 23. The sulfur-resistant layer 23 is polybutylene or sulfur-resistant composite plastic. In other embodiments, the sulfur-resistant replacement pipe 2 may also be made of a single plastic material or a lightweight sulfur-resistant pipe material other than plastic, such as a glass fiber reinforced composite pipe.

[0033] Preferably, the thickness of the anti-sulfur layer 23 is 5 mm. In other embodiments, the thickness of the anti-sulfur layer can be adaptively adjusted according to the pipeline temperature, pressure, medium corrosiveness, medium flow conditions and cost-effectiveness.

[0034] In this embodiment, the outer tube 1 is a steel tube. In other embodiments, the outer tube may be made of a pipe material with high mechanical strength other than a steel tube as required.

[0035] The limiting ring 21 is provided with a second external thread (not shown) matching the limiting thread groove 11 .

[0036] like Figure 5 As shown, when the limiting ring 21 is not provided with a second external thread matching the limiting thread groove 11, a groove 211 is provided on the edge of the limiting ring 21, and a protrusion (not shown) matching the limiting thread groove 11 is provided to limit the rotation of the anti-sulfur replacement pipe. In the actual production process, the pipeline may produce slight vibrations due to the transportation of the medium, causing the anti-sulfur replacement pipe 2 to rotate in the outer pipe 1, thereby wearing the pipeline. After the groove 211 is engaged with the protrusion, the anti-sulfur replacement pipe 2 can be limited to a certain extent, reducing pipeline wear and extending the service life of the pipeline.

[0037] The plastic layer 22 and the anti-sulfur layer 23 of the anti-sulfur replacement pipe 2 can be simultaneously extruded by an extruder onto a set of special double-layered molds for pressing.

[0038] When the combined anti-sulfur pipe has been used for a period of time and the anti-sulfur layer 23 and the plastic layer 22 need to be replaced, unscrew and remove the connecting piece 3, then pull the anti-sulfur replacement pipe 2 out of the outer pipe 1, replace the new anti-sulfur replacement pipe 2 and insert it into the outer pipe 1, and engage the groove 211 of the limiting ring 21 with the protrusion of the limiting thread groove 11, then screw the first external thread 31 of the connecting piece 3 into the limiting thread groove 11 to extrude the limiting ring 21, further limit the anti-sulfur replacement pipe 2, and then install the adjacent pipes, and use the same material sealing ring 4 to seal the two adjacent pipes in the connecting piece 3.

[0039] The utility model adopts the structural design of outer tube plus inner tube and the outer tube is a steel tube, which provides necessary structural support, thereby enhancing the overall rigidity and pressure resistance of the pipeline, and is particularly suitable for large-span installation scenarios; the anti-sulfur replacement tube design is adopted, and the anti-sulfur replacement tube can be made of plastic and anti-sulfur plastic composite, without the need to use anti-sulfur plastic alone, thereby reducing the cost of the overall pipeline, and when the anti-sulfur layer or the plastic layer is damaged, only the damaged part needs to be replaced, without replacing the entire pipeline system, thus saving maintenance costs; the design of the connecting piece threaded connection extrusion sealing ring is adopted, which not only ensures the sealing of the pipeline, but also enhances the structural strength of the connection; the design of the limit ring with grooves or threads is adopted, which further limits the rotation of the anti-sulfur replacement tube in the outer tube, thereby avoiding pipeline wear caused by the rotation of the anti-sulfur replacement tube due to factors such as vibration, thereby extending the service life of the pipeline.

[0040] The above embodiments and drawings do not limit the product form and style of the present utility model. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present utility model.

Claims

1. A replaceable combined anti-sulfur pipe, characterized in that: include: It is composed of multiple minimum connection units spliced ​​together; The minimum connection unit includes: an outer tube, an anti-sulfur replacement tube, a connector and a sealing ring; Limiting thread grooves are provided inside the two ends of the outer tube; A limiting ring is provided on the outer surface of the anti-sulfur replacement tube near one end; The two ends of the connecting member are provided with first external threads matching the limiting thread groove; The anti-sulfur replacement tube is sleeved into the outer tube, the limiting ring is clamped in the limiting thread groove, the first external thread of the connecting piece is matched and connected with the limiting thread groove clamped with the limiting ring, and the sealing ring is arranged in the connecting piece and fits with the end face of the anti-sulfur replacement tube.

2. A replaceable combined anti-sulfur pipe according to claim 1, characterized in that: The anti-sulfur replacement pipe comprises: an outer plastic layer and an inner anti-sulfur layer.

3. A replaceable combined anti-sulfur pipe according to claim 2, characterized in that: The thickness of the anti-sulfur layer is 5 mm.

4. A replaceable combined anti-sulfur pipe according to claim 2, characterized in that: The outer tube is a steel tube.

5. A replaceable combined anti-sulfur pipe according to claim 1, characterized in that: The limiting ring is provided with a second external thread matching the limiting thread groove.

6. A replaceable combined anti-sulfur pipe according to claim 1, characterized in that: A groove is formed on the edge of the limiting ring, and a protrusion matching with the limiting thread groove is provided on the limiting thread groove to limit the rotation of the anti-sulfur replacement pipe.

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