Two-segment type water-pressure sealed bulging piston for large-caliber collecting box

Abstract

The invention provides a two-segment type water-pressure sealed bulging piston for a large-caliber collecting box, wherein the good sealing effect is guaranteed, the quality of the outer end face of the collecting box is not influenced, the potential safety hazard is avoided, and the bulging piston is convenient for follow-up disassembly and less in working capacity. The two-segment type water-pressure sealed bulging piston comprises a collecting box, wherein the inner walls of orifices at two ends of the collecting box comprise machined groove faces and unmachined groove faces. The two-segment type water-pressure sealed bulging piston is characterized by comprising pull plates used in pairs, wherein the two pull plates are respectively arranged at the orifices at two ends of the collecting box, the corresponding circumferential position of the two pull plates is evenly provided with guide holes, the guide holes are arranged outside the collecting box, pull rods penetrate through the guide holes at the corresponding position of the two pull plates, and two opposite surfaces of the two pull plates are respectively provided with a seal structure, each seal structure specifically comprises a guide plate, a press ring, an internal seal ring and an external seal ring, each guide plate is of a ring-shaped plate, each guide plate is fastened at each pull plate, and one sides of each internal seal ring and each external seal ring are tightly adhered to the guide plates.

Description

technical field

[0001] The invention relates to the field of hydraulic test sealing tooling for large-diameter headers or pipes, in particular to a two-stage hydraulic sealing expansion plug for large-diameter headers. Background technique

[0002] After the assembly of the heating surface module of the waste heat boiler is completed, a hydraulic test is required to check the overall assembly and welding quality of the module. During the hydrostatic test, it is necessary to seal the two ends of the header with a pipe diameter exceeding φ300mm and a maximum pipe diameter of φ660x34 in this type of heating surface module. In the prior art, the two ends of this type of large-diameter header are sealed by welding sealing plates directly at the nozzles at both ends. The main problem of this form is: when installing the welding sealing plate, microcracks are likely to occur near the welding heat-affected zone of the header body after welding due to the welding thermal stress,...

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