A plug for sealing holes

Abstract

The invention relates to a hole plugging part, in particular to a plug used for sealing a hole, which comprises a mandrel rod, a sleeve of the mandrel rod, and is arranged in a breaking groove of the mandrel rod, and is characterized in that the mandrel rod head The axial section of the shaft is stepped, and the step adjacent to the rod is a spherical or conical surface, and an anti-retraction ring groove is provided at the joint between the mandrel rod and the step. The inner hole of the casing is matched with the mandrel rod, and is assembled at the step near the spherical or conical surface of the mandrel rod. The plugging structure of the present invention is simple and reasonable, and the mandrel rod is not easy to be pulled off from the casing during installation. Compared with the plugging of the existing structure, the plugging force required for plugging holes is smaller, and the reliability of the sealing is also improved. improve.

Description

technical field [0001] The invention relates to a hole plugging part, in particular to a plug used for sealing holes. Background technique [0002] as attached figure 1 As shown, the well-known plugging structure (such as the plugging with the trademarks of AVSEAL and KOENIGHK) includes a mandrel 01 with a tapered head and a cylindrical sleeve 02 . When using this structure for plugging, the tapered head of the mandrel 01 is pulled into the casing hole, causing the casing 02 to radially expand and fill the hole, thereby sealing the plugging hole. [0003] The disadvantage of the above-mentioned plugging structure is that the deformation of the sleeve is small when the hole is plugged. Therefore, in order to achieve a better sealing effect, the outer diameter of the sleeve must be very close to the diameter of the plugged hole. This brings about two problems. One is that the size range of the holes suitable for plugging the plugging of this structure is relatively small; th...

AI Technical Summary

Problems solved by technology

[0007] Second, in some cases, it cannot meet the higher requirements of the sealing

When the plugged hole is too large, only the radially expanded middle part of the casing is in contact with the hole wall, and there are gaps at both ends. The sealing zone formed in actual use is narrow, which is easy to cause leakage; When the middle part of the casing expands slightly, it will fit the hole wall, and a large force is required to fully fit it. Therefore, in the case of insufficient pulling force, the casing cannot completely fit the hole wall (see attached Figure 4 )

[0008] Third, the plugging force required for plugging holes is relatively large

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