Small-caliber header conical internal pressure sealing device for boiler

Abstract

The invention discloses a small-caliber header conical internal pressure sealing device for a boiler. The device is characterized in that a round hole is formed in a header main body; an inner surface of the round hole is conical; the conical surface is shrunk to the inner part of the header and is opened to the outer side; a sealed metal sleeve is concentrically arranged in the round hole, corresponding to the conical surface; an annular expansion groove is formed around the inner surface of the sealed metal sleeve; the chamfering on the inner edges of the two ends of the sealed metal sleeve is an inclined surface; the sealed metal sleeve is connected with a pressing block at a large-caliber end of the conical surface of the round hole through the inclined surface in a matching mode; the pressing block is fixedly connected to the header main body through a thread; the sealed metal sleeve is connected with an expansion block at a small-caliber end of the conical surface of the round hole through the inclined surface in a matching mode; the expansion block is connected with a threaded rod; and the threaded rod penetrates through the center of the sealed metal sleeve and a central hole of the pressing block to be matched with a nut. The mechanism is suitable for sealing a door opening of the small-caliber header of the boiler, a metal gasket can keep a long-term sealing effect, and the small-caliber header conical internal pressure sealing device is long in service life, difficult to damage, good in sealing effect, safe, reliable, simple in structure and suitable for application and popularization and has an internal pressure sealing structure.

Description

technical field [0001] The invention relates to a boiler header sealing device, in particular to a boiler small-diameter header conical internal pressure sealing device, which is suitable for sealing the opening of the small-diameter header. Background technique [0002] Header is a common part in boiler equipment, used for collecting, mixing, and distributing working fluid, it is the link hub of heating surface arrangement, it can also be used to suspend heating surface, install drainage or sewage device, in order to carry out inspection, repair, maintenance For other work, the larger-diameter headers with an inner diameter > 400mm are equipped with manhole devices, and for small-diameter headers, hand holes, head holes or inspection holes are generally provided. The high-temperature and high-pressure medium runs in the boiler header, which has high requirements for sealing. At present, the door opening of the header is widely used as a flat internal pressure sealing str...

AI Technical Summary

Problems solved by technology

This type of sealing is safe and reliable, and the technology is mature, but for small-diameter headers, the width of the sealing surface is narrow, the installation is difficult, the sealing surface is easy to wear during use, the non-metallic gasket is easy to fail, the service life is short, and it is difficult to clean when replacing. There is also a sealing method for small-diameter headers that directly welds the head, but this will lead to problems such as inspection and maintenance inside the header.

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