CN201277398Y - Steel pipe expansion joint - Google Patents

Abstract

The utility model belongs to the pipeline and pipe technical field, in particular to a steel pipeline expansion joint, which comprises a left end sleeve, a right end sleeve, a packing ring and a connecting flange. The steel pipeline expansion joint is characterized in that a part of the left end sleeve is inserted into the right end sleeve, a baffle block with a lug boss is welded on the outer wall of an end head of the left end sleeve, the lug boss is also arranged on the outer wall of the end head of the right end sleeve, the packing ring is arranged on a joint between the left sleeve and the right sleeve, and a ring-shaped gland with two limit grooves is pressed on the joint of the left end sleeve and the right end sleeve and is fastened by screw bolts. The steel pipeline expansion joint has the advantages that the structure is simple, the sealing effect is good, high temperature and high pressure are resisted, the expansion amount is big, and the installation and maintenance are convenient.

Description

Steel Pipe Expansion Joint

technical field

The utility model belongs to the technical field of pipeline fittings, in particular to a steel pipeline expansion joint.

Background technique

The expansion joint is a common pipe fitting used on industrial pipelines. Its main function is to reduce the damage to the pipe and its connection parts when the pipe is displaced due to vibration or thermal expansion and contraction of the pipe. At present, the commonly used expansion joints include metal expansion joints and non-metallic expansion joints (flexible fabric expansion joints, non-metallic expansion joints), among which non-metallic expansion joints have the characteristics of universal compensation, high and low temperature resistance, pressure resistance, corrosion resistance and other properties . The freedom of installation is large, and large deviations are allowed in the axial and radial directions. Compared with non-metallic expansion joints, metal expansion joints have better wear resistance and fatigue resistance, and are suitable for industrial slurry pipelines with high pressure, high internal medium hardness, and large wear. Commonly used expansion joints are mainly composed of coaxially fitted inner and outer sleeves, with bellows and sealing rings between the inner and outer sleeves. The following defects: due to the increase or decrease of the temperature of the slurry inside the pipeline for transporting ore slurry, the temperature of the pipe body also increases or decreases, resulting in changes in the geometric dimensions of the pipe body, and the existing bellows expansion joints cannot meet high pressure applications Requirements, the tightness cannot be guaranteed in actual use.

Contents of the invention

The purpose of the utility model is to provide a steel pipeline expansion joint with simple structure, good sealing effect, high temperature and high pressure resistance, large expansion and contraction, and convenient installation and maintenance.

The purpose of this utility model is achieved through the following technical solutions.

According to the steel pipe expansion joint of the present invention, it includes a left-end sleeve, a right-end sleeve, a sealing ring, and a connecting flange. It is characterized in that a part of the left-end sleeve is inserted into the right-end sleeve, and A stopper with boss is welded on the outer wall, and there is also a boss on the outer wall of the end of the casing at the right end. There is a sealing ring at the joint of the left and right casings, and an annular gland with two limiting grooves. The sleeve is pressed on the joints of the left and right casings and fastened by bolts.

The left casing is welded by the inlet nipple and the left telescopic nipple, and the right casing is screwed by the right telescopic nipple and the outlet nipple.

The height of the stopper with the limiting protrusion is slightly lower than the height of the two limiting grooves on the gland.

The inlet nipple of the left casing and the outlet nipple of the right casing are made of thicker and wear-resistant materials.

The utility model has the advantages of simple structure, good sealing effect, high temperature and high pressure resistance, large expansion and contraction, and convenient installation and maintenance.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

型的密封圈6，带有两限位凹槽8的环状压盖3扣压在左右两端套管连接处上，并由螺栓紧固。本实用新型所述的左右两套管端头的凸台高度略低于压盖上两限位凹槽的高度。当带有两限位凹槽8的环状压盖3套压在左右两端套管连接处上时，左右两端套管上的两凸台4、7刚好置于环状压盖的两限位凹槽8内，且凸台4、7与限位凹槽8之间有一定长度距离间隙，其伸缩节长短的补偿量的调节范围由限位凹槽8的长度距离间隙确定。As shown in Figure 1, the utility model includes a left sleeve 2, a right sleeve 9, a sealing ring, and a connecting flange. It is characterized in that a part of the left sleeve is inserted into the right sleeve, and the left sleeve ends A block 5 with a boss 4 is welded on the outer wall, and a boss 7 is also arranged on the outer wall of the end of the casing at the right end.

Type sealing ring 6, the annular gland 3 that has two position-limiting grooves 8 is buckled and pressed on the left and right two ends casing joints, and is fastened by bolts. The height of the bosses at the ends of the left and right sleeve pipes described in the utility model is slightly lower than the height of the two limit grooves on the gland. When the annular gland 3 sleeves with two limit grooves 8 were pressed on the joints of the left and right ends of the sleeves, the two bosses 4,7 on the left and right ends of the sleeves were just placed on the two sides of the annular gland. In the limit groove 8, and there is a certain length distance gap between the bosses 4, 7 and the limit groove 8, the adjustment range of the compensation amount of the length of the expansion joint is determined by the length distance gap of the limit groove 8.

In this way, when the slurry is transported, the fluid flows from left to right. When the horizontal displacement occurs on the left and right sides or the temperature of the pipeline increases due to the flow of the slurry, when the pipeline is elongated, the two bosses 4 and 7 on the sleeves at the left and right ends Sliding in the gap of a certain length between the two limit grooves 8 of the annular gland 3 can absorb the increased length of the pipeline. When the boss touches the inner edge of the groove, it is the maximum elongation of the expansion joint amount; if the temperature drops, the pipeline shortens, and the shortening amount can be compensated. When the boss touches the outer edge of the groove, it is the maximum shrinkage amount of the expansion joint.

型，工作时其断面受力均匀，合理，并具有再压紧压盖3，有效地保证了伸缩节的密封效果。In addition because the section of sealing ring 6 of the present utility model is

Type, when working, its cross-section is evenly and reasonably stressed, and has a re-compression gland 3, which effectively ensures the sealing effect of the expansion joint.

In order to connect the left and right bushings 2, 9 with the pipeline for easy installation and maintenance, the utility model welds an inlet puppet 1 on one side of the left bushing 2, and connects it through a flange on one side of the right bushing 9 There are outlet nipples 10, and the inlet and outlet nipples on both sides are made of thickened wear-resistant pipes. Effectively improve the service life of the expansion joint.

Claims (4)

1. A steel pipeline expansion joint, including a left-end sleeve, a right-end sleeve, a sealing ring, and a connecting flange, characterized in that a part of the left-end sleeve is inserted into the right-end sleeve, and the outer wall of the left-end sleeve end There is a stopper with a boss welded on the top, and a boss is also provided on the outer wall of the end of the casing at the right end. There is a sealing ring at the joint of the left and right casings, and an annular gland sleeve with two limiting grooves. Press on the joints of the left and right ends of the sleeves and fasten them with bolts. 2. The steel pipeline expansion joint according to claim 1, characterized in that the left sleeve is welded by the inlet nipple and the left telescopic nipple, and the right sleeve is welded by the right telescopic nipple and the outlet nipple. connected. 3. The steel pipeline expansion joint according to claim 1, wherein the height of the stopper with the limiting protrusion is slightly lower than the height of the two limiting grooves on the gland. 4. The steel pipeline expansion joint according to claim 2, characterized in that the inlet nipple of the left casing and the outlet nipple of the right casing are made of thicker and wear-resistant materials.

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