Novel dust sealing external pressure type expansion joint

Abstract

The invention discloses a novel dust sealing external pressure type expansion joint which comprises a long joint tube, a bolt, a filler, a gland, joints, a corrugated tube, an outer shell, an internal protective tube and a nipple. The internal protective tube is embedded into the nipple, and the nipple is connected with the right end of the shell in a sealed way by a flange. Two ends of the corrugated tube are respectively fixedly connected with the joints, and the long joint tube is inserted into a hole of the corrugated tube and is fixedly connected with a joint inner hole at the right end to form an axial compensation structure. The shell covers the axial compensation structure and is connected with the joint at the left end in a sealed way. According to the expansion joint provided in the invention, an axial dust sealing structure is arranged outside the outer end face of the joint at the left end, the gland in the structure is connected with the joint by the bolt, and a sealing ring embedded into an inner hole groove of the gland plugs a clearance between the dynamic compensation structure and the static joint. The novel dust sealing external pressure type expansion joint is simple in structure and easy to produce, can prevent dust, cannot affect the axial movement of the compensation structure, and is convenient to maintain.

Description

technical field [0001] The invention relates to a shaft sealing structure, in particular to an axial dust sealing structure arranged on an external pressure expansion joint. Background technique [0002] The external pressure expansion joint is a pipeline compensation device with an external bellows structure. The structural feature of the device is that the inner wall of the bellows is not in contact with the transported medium, there is no wear caused by relative movement with the medium, and of course there is no condition for the medium or impurities to block the wave peaks in the bellows. Therefore, the external pressure expansion joint has axial compensation Flexible, large amount of compensation and long service life. External pressure expansion joints are widely used in industrial pipe networks, mainly due to the beneficial effects brought by the above characteristics. Nevertheless, the prior art products are only suitable for use in places with relatively clean en...

AI Technical Summary

Problems solved by technology

Nevertheless, the prior art products are only suitable for use in places with relatively clean environments, and for relatively poor environments, especially in places with relatively large dust, the use effect is getting worse and worse as time goes by, and even the pipes installed due to axial compensation failure damage to the net

The main reason for the failure of the existing technology products is that there is a large gap between the dynamic compensation structure and the static joint, so that the inner cavity of the bellows communicates with the outside world, and the dust in the environment enters from the above gap through the convection of cold and hot air. The inner cavity of the bellows is adsorbed on the inner wall, and the long-term accumulated dust or impurities will significantly reduce the elastic deformation capacity of the bellows

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