Composite sleeve type pipeline expansion compensator

Abstract

The utility model belongs to the field of wear-resistant pipeline equipment, and particularly relates to a composite sleeve type pipeline expansion compensator, which is characterized by comprising a metal inner pipe, a metal outer pipe sleeved outside the metal inner pipe, an inner pipe polyethylene bushing arranged on the inner wall of the metal inner pipe, an outer pipe polyethylene bushing arranged on the inner wall of the metal outer pipe, and an inner and outer pipe sealing structure. According to the composite sleeve type pipeline telescopic compensator, the abrasion resistance of the sleeve type pipeline telescopic compensator is improved, the service life is prolonged, the number of faults and overhaul and maintenance times is reduced, the production operation efficiency is improved, and production loss and overhaul and maintenance cost caused by shutdown are reduced.

Description

Technical Field

[0001] The utility model belongs to the field of wear-resistant pipeline equipment, in particular to a composite sleeve type pipeline expansion compensator. Background Art

[0002] In long-distance pipeline transportation, in order to prevent damage to pipeline connections or welds caused by pipeline extension or contraction due to temperature changes, it is necessary to add a pipeline expansion and contraction device to balance the pipeline contraction caused by temperature changes. In actual production in industries such as metallurgy, mining, and power, due to the presence of a certain concentration of particulate matter in the conveying medium, ordinary steel sleeve-type pipeline expansion and contraction compensators have defects such as rapid wear, short service life, and high failure rate. Expansion compensators with straight-tube non-metallic bushings embedded in them are prone to impact wear on the flange end face of the external pipeline body due to structural reasons, resulting in increased wear and shortened service life of the external pipeline connected to the downstream end of the expansion and contraction compensator. Summary of the Invention

[0003] The purpose of the utility model is to provide a sleeve-type pipe expansion compensator with an embedded special-shaped wear-resistant bushing, which increases the overall wear resistance of the sleeve-type pipe expansion compensator and extends its service life. At the same time, the outer pipe polyethylene bushing adopts an integrally molded structure to prevent the conveying medium from causing impact wear on the end face of the connected external pipe.

[0004] The purpose of this utility model is achieved through the following technical solutions:

[0005] The composite sleeve type pipeline expansion compensator of the present invention is characterized by comprising a metal inner tube, a metal outer tube sleeved outside the metal inner tube, an inner tube polyethylene liner arranged on the inner wall of the metal inner tube, an outer tube polyethylene liner arranged on the inner wall of the metal outer tube, and an inner and outer tube sealing structure.

[0006] The inner and outer tube sealing structure consists of a fixed end, a free end, and a rubber ring. The fixed end is connected to the metal outer tube by welding, the free end is sleeved on the outer wall of the metal outer tube, and the free end is connected to the fixed end by bolt connection. The rubber ring is filled in the cavity between the free end and the fixed end.

[0007] The outer tube polyethylene liner is an integrally formed cylindrical stepped structure.

[0008] Advantages of this utility model:

[0009] The composite sleeve-type pipeline expansion compensator of the utility model increases the wear resistance of the sleeve-type pipeline expansion compensator, prolongs its service life, reduces the number of failures and overhauls and maintenance, improves the production operation rate, and reduces production losses and overhaul and maintenance costs caused by shutdown. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural diagram of the present utility model.

[0011] Figure 2 This is a schematic diagram of the connection between the utility model and the external pipeline. DETAILED DESCRIPTION

[0012] The specific implementation of the present utility model is further described below with reference to the accompanying drawings.

[0013] like Figure 1 、 2 As shown, the composite sleeve type pipeline expansion compensator of the present invention is characterized in that it includes a metal inner tube 1, a metal outer tube 2 sleeved on the outside of the metal inner tube 1, an inner tube polyethylene liner 3 arranged on the inner wall of the metal inner tube 1, an outer tube polyethylene liner 4 arranged on the inner wall of the metal outer tube 2, and an inner and outer tube sealing structure 5.

[0014] The inner and outer tube sealing structure 5 consists of a fixed end, a free end, and a rubber ring. The fixed end is connected to the metal outer tube 2 by welding, the free end is sleeved on the outer wall of the metal outer tube 2, and the free end is connected to the fixed end by bolt connection. The rubber ring is filled in the cavity between the free end and the fixed end.

[0015] The outer pipe polyethylene liner 4 is an integrally formed cylindrical stepped structure, which protects the flange end face of the external pipe connected thereto from slurry impact and wear. In addition, the integrally formed special-shaped polyethylene liner avoids the drawback of a split structure that is easily detached during long-term impact and erosion.

[0016] The utility model is a metal-plastic composite sleeve-type pipe expansion compensator with an integrally molded special-shaped polyethylene bushing. The device consists of a metal inner pipe 1, a metal outer pipe 2, an inner pipe polyethylene bushing 3, an outer pipe polyethylene bushing 4, and an inner and outer pipe sealing structure 5. In actual production applications, when the external pipe is deformed due to temperature differences, the expansion compensator achieves balanced compensation through the relative displacement of the inner and outer pipes. Because the inner and outer pipes are both embedded with polyethylene bushings, the inner pipe polyethylene bushing and the external special-shaped polyethylene bushing are always in direct contact with the slurry, thereby increasing the overall service life of the expansion compensator. The sealing of the inner and outer pipe mating surfaces of the expansion compensator is achieved by a double sealing structure fixed to the non-flange end of the metal outer pipe 2.

[0017] The utility model pipeline expansion compensator needs to separately produce two pipeline flanges, a metal inner pipe 1, a metal outer pipe 2, an inner pipe polyethylene bushing 3, an outer pipe polyethylene bushing 4, an inner and outer pipe sealing structure 5 and other parts. The specific processing and assembly are as follows:

[0018] The inner tube polyethylene liner 3 is formed into a cylindrical liner by extruding the raw material in one step, and then the surface is treated by turning to ensure roundness and surface roughness. It is further inserted into the metal inner tube 1 by external pressure to form a tight fit, and then the flange end face is flanging by flanging process to form a flange end sealing surface, forming a composite inner sleeve structure as shown in the figure;

[0019] The outer tube polyethylene liner 4 is formed into a cylindrical liner by extruding the raw material, and then processed into a special-shaped polyethylene liner by turning to ensure the roundness and surface roughness of the polyethylene liner. It is further inserted into the metal outer tube 2 by external pressure to form a tight fit.

[0020] The inner and outer tube sealing structure 5 consists of a fixed end and a free end. The fixed end is connected to the non-flange end of the metal outer tube 2 by welding. The free end is first sleeved on the outer wall of the metal inner tube 1 and connected to the fixed end by bolt connection. A high-quality rubber ring is filled in the cavity between the free end and the fixed end. After the free end and the fixed end of the inner and outer tube sealing structure 5 are connected and tightened, a seal is formed on the mating surface of the inner and outer sleeves of the compensator.

[0021] This new expansion compensator is suitable for use in pipes of various diameters and specifications. Specific dimensions are designed based on the required pipe diameter, pressure, and compensation volume. The molecular weight of the polyethylene bushings in the inner and outer pipes must be tailored to the service life and wear resistance requirements specified in the pipeline design. Therefore, this compensator does not specify specific dimensions or the molecular weight of the polyethylene bushing.

[0022] The composite sleeve-type pipeline expansion compensator of the utility model increases the wear resistance of the sleeve-type pipeline expansion compensator, prolongs its service life, reduces the number of failures and overhauls and maintenance, improves the production operation rate, and reduces production losses and overhaul and maintenance costs caused by shutdown.

Claims

1. A composite sleeve type pipeline expansion compensator, characterized in that It includes a metal inner tube, a metal outer tube sleeved outside the metal inner tube, an inner tube polyethylene liner arranged on the inner wall of the metal inner tube, an outer tube polyethylene liner arranged on the inner wall of the metal outer tube, and an inner and outer tube sealing structure.

2. The composite sleeve type pipeline expansion compensator according to claim 1 is characterized in that: The inner and outer tube sealing structure consists of a fixed end, a free end, and a rubber ring. The fixed end is connected to the metal outer tube by welding, the free end is sleeved on the outer wall of the metal outer tube, and the free end is connected to the fixed end by bolt connection. The rubber ring is filled in the cavity between the free end and the fixed end.

3. The composite sleeve type pipeline expansion compensator according to claim 1 is characterized in that: The outer tube polyethylene liner is an integrally formed cylindrical stepped structure.

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