一种双金属复合偏壁弯头结构

Abstract

本实用新型公开了一种双金属复合偏壁弯头结构，其涉及矿用弯头技术领域，包括弯管、直管、变径短节和连接组件，所述弯管、直管、变径短节分别为保护层和耐磨层的双层结构，所述耐磨层设置在保护层的内侧壁，所述弯管、变径短节和直管的保护层直径相等，所述变径短节的两端通过连接组件分别与弯管和直管连接；本实用新型通过设置一个壁厚连续变化的变径短节，其一端内壁与直管完全匹配（壁厚为h），另一端内壁与弯管外径侧完全匹配（壁厚为1.5h~2h），该设计在结构上实现了从直管均匀壁厚到弯管非均匀壁厚的几何连续与平滑过渡，彻底消除了连接处的台阶和突兀的高度差，从源头上避免了物料流经时的剐蹭现象。

Claims

1. A bi-metallic composite offset bend structure, characterized by, The device includes a bend (1), a straight pipe (2), a reducing short section (3), and a connecting assembly (4). The bend (1), straight pipe (2), and reducing short section (3) are double-layer structures consisting of a protective layer (5) and a wear-resistant layer (6), respectively. The wear-resistant layer (6) is disposed on the inner wall of the protective layer (5). The diameters of the protective layers (5) of the bend (1), reducing short section (3), and straight pipe (2) are equal. The two ends of the reducing short section (3) are connected to the bend (1) and straight pipe (2) respectively through the connecting assembly (4). The wall thickness of the wear-resistant layer (6) at both ends of the reducing short section (3) is equal to and smoothly transitions with the wall thickness of the wear-resistant layer (6) of the straight pipe (2) and the wall thickness of the wear-resistant layer (6) of the bend (1). The wall thickness of the wear-resistant layer (6) in the inner circumferential direction and the axial direction of the reducing short section (3) is continuously and smoothly varied. The length of the reducing short section (3) is 200mm~300mm.

2. The bimetallic composite offset wall elbow structure according to claim 1, wherein, The connecting assembly (4) includes a pair of first flanges (41), a pair of second flanges (42), a plurality of short bolts (43) and a plurality of long bolts (44). The pair of first flanges (41) are respectively fixed at the ends of the straight pipe (2) and the bend (1), and the pair of second flanges (42) are respectively fixed at the ends of the reducing short section (3). Adjacent first flanges (41) and second flanges (42) are connected by a plurality of short bolts (43). The outer diameter of the first flange (41) is larger than the outer diameter of the second flange (42). The pair of first flanges (41) are connected by a plurality of long bolts (44).

3. The bimetallic composite offset wall elbow structure according to claim 2, wherein, A sealing gasket (45) is provided between the first flange (41) and the second flange (42).

4. The bimetallic composite offset wall elbow structure of claim 1, wherein, The connecting assembly (4) is made of welding and flange. The reducing stub (3) and the bend (1) are connected by welding. The reducing stub (3) and the straight pipe (2) are respectively provided with flanges at one end and connected by bolts.

5. The bi-metallic composite miter bend structure of claim 1, wherein, The variable diameter short section (3) has a protrusion (7) on the end face of the bend (1), and the end face of the bend (1) has a groove (8). When the variable diameter short section (3) is connected to the bend (1), the protrusion (7) is inserted into the groove (8).

6. The bimetallic composite offset wall elbow structure of claim 1, wherein, The wear-resistant layer (6) is made of high-chromium alloy by centrifugal casting.

7. The bimetallic composite offset wall elbow structure according to claim 1, wherein, The protective layer (5) is made of seamless steel pipe.

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