Ceramic-steel pipe combined wear-resistant pipeline elbow

Abstract

The utility model relates to a ceramic-steel pipe combined wear-resistant pipeline elbow which comprises a steel elbow, a connecting buckle and a ceramic pipe piece. An inner groove is formed in an easy-to-wear position on the inner wall of the steel bent pipe; the connecting buckle is fixed to the inner wall of one side of the inner groove through a bolt. The ceramic pipe piece is of an arc-shaped structure matched with the inner groove, the ceramic pipe piece is installed in the inner groove, one end of the ceramic pipe piece is connected with the connecting buckle in a clamped and assembled mode, bonding glue is filled between the ceramic pipe piece and the steel bent pipe and between the ceramic pipe piece and the connecting buckle, and the ceramic pipe piece is connected with the steel bent pipe in a brazed mode. According to the ceramic pipe piece, abrasion of materials to a pipeline can be greatly reduced, material cost and labor cost caused by elbow replacement are avoided, and the operation cost of a pneumatic transportation system is reduced; by designing a mechanical connection mode and a comprehensive mode of bonding and brazing, long-acting tight attachment of the ceramic pipe piece and the steel bent pipe is achieved, the integrality of a ceramic-steel pipe combination is enhanced, and the service life of a pneumatic transportation pipeline is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic conveying pipelines, in particular to a ceramic-steel composite wear-resistant pipeline elbow. Background Art

[0002] The conveying medium in the pneumatic conveying pipeline may be liquid, gas, or solid and its mixture. With the changes in the pipeline direction and the pressure and temperature inside the pipe, the multiphase flow pattern inside the pipe also changes accordingly. Under the carrying of different flow velocities, particles are extremely easy to cause erosion wear and corrosion thinning on local components such as pipelines, especially elbows and gate valves, which will further lead to leakage accidents. In severe cases, explosion accidents and environmental pollution will be caused. The wear inside the conveying pipeline is concentrated in the elbow part. When the pipeline is severely worn, it will affect the service life and efficiency of the system.

[0003] The selection of the pneumatic conveying pipeline material is determined according to the medium temperature and corrosion situation. Generally, steel coil pipes can be considered, which have low economic cost and strong impact resistance, but their hardness is relatively low and their friction resistance performance is poor. Ceramic materials have many excellent properties, such as high temperature resistance, wear resistance, high strength, etc., and have important applications in many fields such as aerospace, machinery, and energy. Due to the high hardness and wear resistance characteristics of ceramics, the steel at the elbow of the pipeline can be replaced, effectively reducing pipeline wear. In the traditional method, ceramic sheets are pasted to the inner side of the pipe wall with glue. In a short time, the ceramics can be effectively bonded to the pipe wall, but after the pneumatic conveying system operates for a period of time, the ceramics will gradually fall off.

[0004] At present, there is an urgent need for a connection method to achieve long-term and tight bonding between ceramics and steel and to apply to a structural component with both the advantages of ceramic materials and metal materials in pneumatic conveying pipelines. Summary of the Utility Model

[0005] The utility model aims to solve the deficiencies of the prior art and provides a ceramic-steel composite wear-resistant pipeline elbow.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] A ceramic-steel composite wear-resistant pipeline elbow includes a steel elbow, a connecting buckle, and a ceramic pipe sheet;

[0008] Inner grooves are opened at the easily worn positions on the inner wall of the steel elbow; the connecting buckle is fixed to the inner wall on one side of the inner groove by bolts; the ceramic pipe sheet is an arc-shaped structure matching the inner groove, the ceramic pipe sheet is installed in the inner groove, one end of the ceramic pipe sheet is snap-fitted and assembled with the connecting buckle, an adhesive is filled between the ceramic pipe sheet and the steel elbow and the connecting buckle, and the connection between the ceramic pipe sheet and the steel elbow is brazed.

[0009] The connecting buckle includes a connecting plate. A countersunk bolt hole runs through the middle of the connecting plate. The connecting plate is connected to one inner wall of the inner groove by a bolt in the countersunk bolt hole. On one side of the connecting plate, clamping plates are symmetrically arranged on both sides of the countersunk bolt hole. The connecting plate and the two clamping plates form a "Π" - shaped structure, and a number of clamping - mouth grooves are evenly formed on the clamping plates.

[0010] On the end face of the ceramic segment where it engages with the connecting buckle, an installation groove is formed. A number of triangular clamping plates are evenly arranged on the inner wall of the installation groove. The positions of the triangular clamping plates correspond one - to - one with the positions of the clamping - mouth grooves. The clamping plates of the connecting buckle extend into the installation groove of the ceramic segment, and the triangular clamping plates are correspondingly clamped with the clamping - mouth grooves.

[0011] On the inner side of the end face of the ceramic segment where it engages with the connecting buckle, a convex plate extends. The convex plate fits against the side wall of the connecting plate.

[0012] A number of glue - injection holes run through the ceramic segment, and the glue - injection holes communicate with the installation groove.

[0013] The thickness of the clamping plate is less than the width of the installation groove.

[0014] The beneficial effects of the present utility model are as follows: The ceramic segments of the present utility model can significantly reduce the wear of materials on the pipeline, avoid the material cost and labor cost brought by the replacement of elbows, and reduce the operation cost of the pneumatic conveying system; through the design of a comprehensive method of mechanical connection, bonding and brazing, the long - term and tight fitting of the ceramic segment and the steel elbow is realized, enhancing the integrity of the ceramic - steel combination and improving the service life of the pneumatic conveying pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is the structural schematic diagram of the present utility model;

[0016] Figure 2 is the structural schematic diagram of the steel elbow;

[0017] Figure 3 is the structural schematic diagram of the connecting buckle;

[0018] Figure 4 is the structural schematic diagram of the ceramic segment;

[0019] Figure 5 is the structural schematic diagram of the connection part between the connecting buckle and the ceramic segment;

[0020] Figure 6 is the schematic diagram after the connecting buckle and the ceramic segment are connected;

[0021] In the figure: 1 - steel elbow; 2 - connecting buckle; 3 - ceramic segment;

[0022] 11 - inner groove;

[0023] 21 - Connection plate; 22 - Countersunk bolt hole; 23 - Card plate; 24 - Bayonet slot;

[0024] 31 - Installation groove; 32 - Triangular card plate; 33 - Convex plate; 34 - Glue injection hole;

[0025] The following will be described in detail with reference to the accompanying drawings in combination with the embodiments of the present invention. Specific embodiments

[0026] The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention. In the following paragraphs, the present invention will be described more specifically by way of example with reference to the accompanying drawings. The advantages and features of the present invention will be clearer according to the following description. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise scales, and are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention.

[0027] It should be noted that when a component is referred to as "fixed to" another component, it can be directly on the other component or there can also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0030] Such as Figure 1 、 Figure 2As shown in the figure, a wear-resistant pipe elbow composed of ceramics and steel pipes includes a steel elbow 1, a connecting buckle 2, and a ceramic pipe segment 3. Inner grooves 11 are provided at the easily worn positions on the inner wall of the steel elbow 1, and the groove curves of the inner grooves 11 are consistent with those of the steel elbow 1; the connecting buckle 2 is fixed to the inner wall on one side of the inner groove 11 by bolts; the ceramic pipe segment 3 is an arc-shaped structure that fits the inner groove 11, and the ceramic pipe segment 3 is installed in the inner groove 11. One end of the ceramic pipe segment 3 is engaged and assembled with the connecting buckle 2. An adhesive is filled between the ceramic pipe segment 3, the steel elbow 1, and the connecting buckle 2, and the connection between the ceramic pipe segment 3 and the steel elbow 1 is brazed.

[0031] As Figure 3 shown in the figure, the connecting buckle 2 includes a connecting plate 21. A countersunk bolt hole 22 runs through the middle of the connecting plate 21. The connecting plate 21 is connected to the inner wall on one side of the inner groove 11 by bolts in the countersunk bolt hole 22. On one side of the connecting plate 21, clamping plates 23 are symmetrically arranged on both sides of the countersunk bolt hole 22. The connecting plate 21 and the two clamping plates 23 form a "Π"-shaped structure, and a number of bayonet slots 24 are evenly opened on the clamping plates 23.

[0032] The connecting buckle 2 is made of plastic, which is convenient for installation with a certain amount of deformation to ensure normal engagement.

[0033] As Figure 4 shown in the figure, mounting grooves 31 are provided on the end face of the ceramic pipe segment 3 that engages with the connecting buckle 2. A number of triangular clamping plates 32 are evenly arranged on the inner wall of the mounting grooves 31. The positions of the triangular clamping plates 32 correspond one by one to the positions of the bayonet slots 24. The clamping plates 23 of the connecting buckle 2 extend into the mounting grooves 31 of the ceramic pipe segment 3, and the triangular clamping plates 32 are correspondingly engaged with the bayonet slots 24. On the inner side of the end face of the ceramic pipe segment 3 that engages with the connecting buckle 2, a convex plate 33 extends. The convex plate 33 fits against the side wall of the connecting plate 21. A number of glue injection holes 34 run through the ceramic pipe segment 3, and the glue injection holes 34 communicate with the mounting grooves 31. The thickness of the clamping plate 23 is less than the width of the mounting groove 31.

[0034] The convex plate 33 can completely cover the connecting buckle 2 to prevent the connecting buckle 2 from contacting the material.

[0035] The material of the ceramic pipe segment 3 is ceramic, and the cross-section of the engaging end face is a ring on the inner side and a mountain shape on the outer side.

[0036] After the connecting buckle 2 and the ceramic pipe segment 3 are buckled, there is a certain gap between the mountain-shaped cross-section and the Π-shaped cross-section. Epoxy resin glue is injected through the glue injection holes 34 until the gap is filled. The epoxy resin glue improves the integrity of the steel elbow 1, the connecting buckle 2, and the ceramic pipe segment 3.

[0037] The connection between the ceramic segment 3 and the steel elbow 1 is brazed using a filler metal block, and an adhesive is added to the two contact surfaces of the filler metal block and the base material. Before welding, the steel elbow 1 is successively polished with sandpaper and then ultrasonically cleaned with an acetone solution to remove the oxide film existing on the surface of the steel. The filler metal block is an AgCuSnNi-Ti active composite filler metal, with the Ti element content ≤ 6 wt.%, and the maximum shear strength > 33.6 MP. It plays a role in relieving the stress between the ceramic and metal materials in the joint, reducing the residual stress. At the same time, it can also change and inhibit some negative interfacial reactions, making the interfacial state more stable.

[0038] The specific implementation method is as follows:

[0039] When the utility model is in use, the steel elbow 1, the connection buckle 2, and the ceramic segment 3 are processed and produced in a prefabrication yard through a sizing template, transported to the pipeline installation site. The steel elbow 1 is placed on a flat site and fixed. The boundary of the inner groove 11 is polished with sandpaper and then ultrasonically cleaned with an acetone solution to remove the oxide film existing on the surface of the steel. The connection buckle 2 is installed at the upper end of the inner groove 11 on the inner wall of the steel elbow 1 through bolts. Then, the ceramic segment 3 is placed in the inner groove 11, and it is pushed upward so that the triangular clamping plate 32 enters the bayonet slot 24 to complete the mechanical connection of the connection buckle 2 and the ceramic segment 3. Epoxy resin glue is slowly injected into the clamping gap through the glue injection hole 34 until the epoxy resin glue flows out from the glue injection hole 34. The glue injection hole 34 is blocked for a period of time to make the glue complete curing. The adhesive is applied to the contact surfaces of the filler metal block, the inner groove 11, and the ceramic segment 3. The steel elbow 1 and the ceramic segment 3 are brazed using the filler metal block. After completion, it is hoisted to the pipeline installation position and welded with other pipe segments to complete the connection of the pipeline elbow.

[0040] Ceramic materials are the materials with the best stiffness and highest hardness in engineering materials, and have good corrosion resistance to acids, alkalis, and salts. Replacing steel with it in the pneumatic conveying pipeline elbow can greatly reduce the wear of the pipeline by materials, avoid the material cost and labor cost brought by elbow replacement, and reduce the operation cost of the pneumatic conveying system.

[0041] Through the design of a comprehensive method of mechanical connection, bonding, and brazing, the long-term and tight fitting of ceramics and steel is realized, enhancing the integrity of the ceramic-steel combination and improving the service life of the pneumatic conveying pipeline.

[0042] The brazing uses an AgCuSnNi-Ti active composite filler metal, which does not completely melt during the brazing process. It plays a role in relieving the stress between the ceramic and metal materials in the joint, and can also change and inhibit some negative interfacial reactions, making the interfacial state more stable.

[0043] The above has made an exemplary description of the present utility model in conjunction with the accompanying drawings. Obviously, the specific implementation of the present utility model is not limited by the above-mentioned manner. As long as various improvements are made by adopting the method concept and technical solution of the present utility model, or directly applied to other occasions without improvement, they are all within the protection scope of the present utility model.

Claims

1. A ceramic-steel pipe combined wear-resistant pipe elbow, characterized in that: It comprises a steel bent pipe (1), a connecting buckle (2) and a ceramic pipe segment (3); An inner groove (11) is provided at a position prone to wear on the inner wall of the steel bent pipe (1); a connecting buckle (2) is fixed to the inner wall of one side of the inner groove (11) by means of bolts; a ceramic tube segment (3) is an arc-shaped structure matched with the inner groove (11); the ceramic tube segment (3) is installed in the inner groove (11); one end of the ceramic tube segment (3) is engaged and assembled with the connecting buckle (2); adhesive is filled between the ceramic tube segment (3), the steel bent pipe (1) and the connecting buckle (2); and the ceramic tube segment (3) and the steel bent pipe (1) are connected by brazing at the connection.

2. The ceramic-steel pipe combined wear-resistant pipe elbow according to claim 1 is characterized in that: The connecting buckle (2) comprises a connecting plate (21), a countersunk bolt hole (22) is penetrated in the middle of the connecting plate (21), the connecting plate (21) is connected to the inner wall of one side of the inner groove (11) through a bolt in the countersunk bolt hole (22), one side of the connecting plate (21) is symmetrically provided with clamping plates (23) on both sides of the countersunk bolt hole (22), the connecting plate (21) and the two clamping plates (23) form a "Π"-shaped structure, and a plurality of clamping grooves (24) are evenly provided on the clamping plate (23).

3. The ceramic-steel pipe combined wear-resistant pipe elbow according to claim 2 is characterized in that: An installation groove (31) is provided on the end surface of the ceramic tube segment (3) that is engaged with the connecting buckle (2), and a plurality of triangular clamping plates (32) are evenly arranged on the inner wall of the installation groove (31). The positions of the triangular clamping plates (32) correspond to the positions of the clamping grooves (24) one by one. The clamping plates (23) of the connecting buckle (2) extend into the installation groove (31) of the ceramic tube segment (3), and the triangular clamping plates (32) are correspondingly engaged with the clamping grooves (24).

4. The ceramic-steel pipe combined wear-resistant pipe elbow according to claim 3 is characterized in that: A convex plate (33) is extended from the inner side of the end surface of the ceramic tube sheet (3) that is engaged with the connecting buckle (2), and the convex plate (33) is attached to the side wall of the connecting plate (21).

5. The ceramic-steel pipe combined wear-resistant pipe elbow according to claim 4 is characterized in that: A plurality of glue injection holes (34) are formed through the ceramic tube sheet (3), and the glue injection holes (34) are communicated with the mounting groove (31).

6. The ceramic-steel pipe combined wear-resistant pipe elbow according to claim 5, characterized in that: The thickness of the clamping plate (23) is smaller than the width of the mounting groove (31).

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