CN205716144U - A kind of packing type extension section for pressure steel pipeline - Google Patents

Abstract

The utility model relates to a packing type pressure steel pipe expansion joint, which includes an inner casing, an outer casing, a corrugated pipe and a corrugated core, wherein: one end of the inner casing is connected with a pressure steel pipe, and the outer casing is set at the other end of the inner casing. It is connected to another pressure steel pipe, and a sealing structure consisting of a packing and a pressure ring is arranged between the inner and outer casings. One end of the bellows is welded to the end of the inner casing, the other end is welded to the end of the pressure steel pipe connected to the outer casing, and the wave bottom of the bellows is placed on the inner wall of the outer casing, and the wave core is arranged on the corrugated between the tube and the casing. The utility model combines the advantages of the existing telescopic joints, and adopts the structural form of adding bellows in the sleeve-type telescopic joints to form a new sub-rigid body structure, ensuring no leakage from the structure, no need to replace packing, and improving the safety of operation Reliability and the ability to compensate for deformation of the penstock due to temperature and temperature-settling.

Description

A packing type pressure steel pipe expansion joint

technical field

The utility model relates to a pressure steel pipe connection part, in particular to a packing type pressure steel pipe expansion joint.

Background technique

The penstock is an important part of the hydraulic structure of the hydropower station, and the expansion joint is an important safety structural device of the penstock. Existing expansion joints are generally divided into: sleeve type (filler type), disc type (lens type), and fold type (corrugated type). At present, casing-type expansion joints and fold-type expansion joints are usually used in hydraulic pipelines in my country, and the use of disc-type expansion joints is limited due to their small axial displacement compensation.

The sleeve-type expansion joint has a large axial displacement compensation capability, simple structure, and easy installation, but it is easy to leak, and requires frequent inspection and replacement of packing, which requires a large amount of operation and maintenance. The corrugated (corrugated) expansion joint has a certain axial displacement compensation and does not leak, but its safety and reliability are poor, especially the forming process of steel plates with large diameters and thick walls is very difficult, and general engineers and technicians are reluctant to use them.

Contents of the invention

The purpose of the utility model is to improve and innovate the shortcomings and problems existing in the background technology, and to provide a packing-type pressure steel pipe telescopic joint with a simple structure that can meet the sealing and displacement requirements of the pressure steel pipe.

The technical solution of the utility model is to construct a telescopic joint connected between two pressure steel pipes, which includes an inner casing, an outer casing, a bellows and a wave core, wherein: one end of the inner casing is connected to a pressure steel pipe, The outer casing is set on the other end of the inner casing and connected to another pressure steel pipe, and a sealing structure composed of a packing and a pressure ring is arranged between the inner and outer casings.

One end of the bellows is welded to the end of the inner casing, the other end is welded to the end of the pressure steel pipe connected to the outer casing, and the wave bottom of the bellows is placed on the inner wall of the outer casing, and the wave core is arranged on the Between bellows and outer casing.

Advantages and beneficial effects of the utility model:

The utility model combines the advantages of the existing telescopic joints, and adopts the structural form of adding bellows in the sleeve-type telescopic joints to form a new sub-rigid body structure, ensuring no leakage from the structure, no need to replace packing, and improving the safety of operation Reliability, and the ability to compensate for deformation of penstocks due to temperature and temperature-sinking.

Description of drawings

Fig. 1 is the utility model sectional structure schematic diagram.

detailed description

Structure and working principle of the present utility model:

The bellows of the utility model is a sealing component, which is welded in the gap between the two steel pipes, and its outer layer is supported by an outer casing, and at the same time, the sealing bellows is provided with wave stabilization facilities, that is, a wave core is installed between the bellows and the outer casing , can effectively solve the instability problem of the sealed bellows caused by external pressure, so that the entire bellows, wave core and outer sleeve form a sub-rigid body structure.

When the expansion joint is working normally, the bellows is subjected to internal water pressure, resulting in expansion or other deformations. Due to the support of the outer sleeve and the corrugated core, the internal pressure on the bellows can completely pass through the outer sleeve and the corrugated core. passed to the outer cannula. In addition to the sealing function, the bellows also plays the role of transmitting internal force.

When the expansion joint works under the supernormal pressure and the internal pressure is far greater than the design pressure, since the bellows is a thin shell structure, under the action of the supernormal pressure, the corrugated sealing tube will be completely deformed, and it will be in full contact with the corrugated core. , and lean against the outer casing, so that the entire telescopic device is integrated into a rigid body. Under the rigidity of the outer casing, the telescopic device can fully withstand the abnormal internal pressure. In addition, because the gap between the bellows and the wave core is designed to be very small, the deformation of the bellows is also limited. When the internal pressure reaches a certain level, the internal pressure on the bellows is completely transmitted to the bellows through the wave core. On the outer sleeve, the stress in the bellows will not increase too much, ensuring that the bellows will not break, and the safety and reliability of the telescopic device is guaranteed structurally.

In order to facilitate the understanding of the utility model, the utility model will be described more fully below with reference to the relevant drawings. Preferred embodiments of the present utility model are provided in the accompanying drawings. However, the invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

It should be noted that when an element is considered to be “disposed” or “connected” to another element, it may be directly disposed or connected to another element or an intervening element may exist at the same time.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the present invention. The terms used in the description are only for describing specific implementation purposes, and are not intended to limit the utility model.

Example:

As shown in Figure 1, the expansion joint includes an inner casing 1, an outer casing 2, a bellows 3, a wave core 4, a packing 5, a pressure ring 6, an O-ring 8, and a flange 2-1.

Specifically, as shown in Figure 1, one end of the inner casing 1 is welded with a pressure steel pipe, and the outer casing 2 is set on the other end of the inner casing 1 and connected to another pressure steel pipe 7, and a disc is arranged between the inner casing and the outer casing. The sealing structure composed of root 5 and pressure ring 6. One end of the bellows 3 is welded to the end of the inner sleeve 1 , and the other end is welded to the end of the pressure steel pipe 7 connected to the outer sleeve 2 , and the wave bottom of the bellows 3 is placed on the inner wall of the outer sleeve 2 . The wave core 4 is arranged between the bellows 3 and the outer sleeve 2 .

Specifically, as shown in Figure 1, one end of the outer casing 2 is provided with a flange 2-1 to be bolted to the connecting flange 7-1 of the pressure steel pipe 7, and the packing 5 and the pressure ring 6 are arranged at the other end of the outer casing 2 and passed through Bolt on. Further, an O-ring 8 is arranged between the flange 2-1 and the connecting flange 7-1 for sealing.

Specifically, the bellows is a single-wave thin-walled pipe, or a multi-wave thin-walled pipe.

Specifically, there is a gap between the bellows 3 and the wave core 4 .

The embodiments described in the utility model are only a description of the preferred implementation of the utility model, and are not intended to limit the concept and scope of the utility model. Various modifications and improvements made in the technical solution of the utility model shall fall within the scope of protection of the utility model, and the technical content claimed in the utility model has been fully recorded in the claims.

Claims (4)

1. A packing type penstock expansion joint, connected between two penstocks, characterized in that it includes an inner casing, an outer casing, a bellows and a wave core, wherein: One end of the inner casing is connected to a pressure steel pipe, the other end of the outer casing is set on the other end of the inner casing and connected to another pressure steel pipe, and a packing and a pressure ring are arranged between the inner and outer casings. sealed structure; One end of the bellows is welded to the end of the inner casing, the other end is welded to the end of the pressure steel pipe connected to the outer casing, and the wave bottom of the bellows is placed on the inner wall of the outer casing, and the wave core is arranged on the Between the bellows and the outer casing; The corrugated pipe is a single-wave thin-walled pipe. 2. The packing type pressure steel pipe expansion joint according to claim 1, characterized in that one end of the outer casing is provided with a flange to connect with the connecting flange of the pressure steel pipe with bolts, and the packing and pressure ring are arranged on the outer casing The other end of the pipe is fixed with bolts. 3. The packing type penstock expansion joint according to claim 2, characterized in that an O-ring seal is provided between the flange and the connecting flange. 4. The packing type penstock expansion joint according to claim 1, characterized in that there is a gap between the bellows and the wave core.