CN205640013U - Detachable pressure steel pipe telescopic joint of flanged union - Google Patents

Abstract

The utility model relates to a detachable pressure steel pipe telescopic joint with a flange live joint, which comprises an inner casing, an outer casing, a bellows and a corrugated core body, wherein: one end of the inner casing is provided with an inner pipe flange connection A pressure steel pipe, the outer casing is set on the other end of the inner casing, and an outer pipe flange is provided to connect to another pressure steel pipe, and a sealing assembly is arranged between the inner and outer casings. One end of the bellows is welded to the end of the inner sleeve, and the other end is fixedly assembled on the outer sleeve through the provided joint, and the wave bottom of the bellows is placed on the inner wall of the outer sleeve, and the wave core is set Between the bellows and the outer casing. The utility model adopts the structural form of adding bellows in the sleeve-type telescopic joint to form a new structure of sub-rigid body, and it is a detachable structure, which can effectively ensure no leakage and no need to replace packing, which improves the safety and reliability of operation. And it has the ability to compensate the deformation of the penstock due to temperature and temperature-subsidence.

Description

A detachable pressure steel pipe expansion joint with a flange union

technical field

The utility model relates to a pressure steel pipe connection part, in particular to a detachable pressure steel pipe expansion joint with a flanged 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 on the shortcomings and problems existing in the background technology, and to provide a detachable pressure steel pipe expansion joint with a flanged joint that is simple in structure and can meet the sealing and displacement requirements of the pressure steel pipe.

The technical scheme 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 provided with an inner pipe method The flange is connected to a pressure steel pipe, the outer casing is set on the other end of the inner casing, and an outer pipe flange is provided to connect to another pressure steel pipe, and a sealing assembly is arranged between the inner and outer casings.

One end of the bellows is welded to the end of the inner sleeve, the other end is welded to the positioning ring of the outer sleeve, and the wave bottom of the bellows is placed on the inner wall of the outer sleeve, and the wave core is arranged on the bellows between the outer casing.

Advantages and beneficial effects of the utility model:

The utility model combines the advantages of the existing expansion joints, and adopts the structural form of adding bellows in the sleeve type expansion joints to form a new sub-rigid body structure, which is a detachable structure, which can effectively ensure no leakage and no need to be replaced. The filler improves the safety and reliability of operation, and has the ability to compensate the deformation of the penstock due to temperature and temperature-subsidence.

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 telescopic joint includes an inner casing 1, an outer casing 2, a bellows 3, a wave core 4, a block pressure ring 5, a positioning ring 6, a sealing ring 7, a pressure ring 8, a sealing ring 9, Inner pipe flange 1-1, O-ring seal 1-2, outer pipe flange 2-1, O-ring seal 2-2.

Specifically, as shown in Figure 1, one end of the inner casing 1 is provided with an inner pipe flange 1-1 connected to a pressure steel pipe 10, and the outer casing 2 is set on the other end of the inner casing 1, and is provided with an outer pipe flange 2-1. Another penstock 11 is connected. A sealing assembly is arranged between the inner and outer sleeves.

One end of the bellows 3 is welded to the end of the inner sleeve 1 , the other end is welded to the positioning ring of the outer sleeve, 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 FIG. 1 , the joint includes a segmented pressure ring 5 , a positioning ring 6 assembled in the segmented pressure ring 5 , and a sealing ring 7 arranged between the segmented pressure ring 5 and the positioning ring 6 . Wherein the positioning ring 6 is welded to one end of the bellows 3, and the positioning ring 6 and the sealing ring 7 are fixed on the inner wall of the outer casing 2 by bolts of the segmented pressure ring 5 .

Specifically, as shown in Fig. 1, the inner casing 1 is connected and fixed by detachable bolts to the assembled pressure steel pipe 10 through the inner pipe flange 1-1, and the outer casing 2 is connected to the assembled pressure steel pipe through the outer pipe flange 2-1. 11 detachable bolts are fixed.

Specifically, as shown in FIG. 1 , the seal assembly between the inner and outer sleeves includes a seal and a pressure ring 8 , and the seal is fixed on the outer sleeve 2 by bolts through the pressure ring 8 . Further, the sealing element in this embodiment is a sealing ring 9 .

Specifically, as shown in Figure 1, an O-ring seal 1-2 is provided between the inner pipe flange 1-1 and the connected pressure steel pipe flange, and the outer pipe flange 2-1 and the connected pressure steel pipe flange An O-ring seal 2-2 is arranged between them.

Specifically, the bellows 3 is a single-wave thin-walled pipe, or a multi-wave thin-walled pipe, as shown in FIG. 1 .

Specifically, as shown in FIG. 1 , 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 (7)

1. A detachable pressure steel pipe expansion joint with a flanged joint, connected between two pressure steel pipes, characterized in that it includes an inner casing, an outer casing, a bellows and a corrugated core, wherein: One end of the inner casing is provided with an inner pipe flange connected to a pressure steel pipe, and the outer casing is set on the other end of the inner casing, and is provided with an outer pipe flange connected to another pressure steel pipe. There is a sealing component between them; One end of the bellows is welded to the end of the inner casing, the other end is welded to the positioning ring of the movable joint of 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 set Between the bellows and the outer casing; The joint includes a segmented pressure ring, a positioning ring assembled in the segmented pressure ring, and a sealing ring arranged between the segmented pressure ring and the positioning ring, wherein: the positioning ring is welded to one end of the bellows, The locating ring and the sealing ring are fixed on the inner wall of the outer sleeve through the block pressing ring bolts. 2. The detachable pressure steel pipe expansion joint with flange union according to claim 1, characterized in that the inner casing is connected and fixed by the inner pipe flange and the assembled pressure steel pipe with detachable bolts, and the The outer casing of the outer casing is fixed through the detachable bolted connection between the outer pipe flange and the assembled pressure steel pipe. 3. The detachable pressure steel pipe expansion joint with flange union according to claim 1, characterized in that the seal assembly between the inner and outer sleeves includes a seal and a compression ring, and the seal passes through The pressure ring bolt is fixed on the outer casing. 4. The detachable pressure steel pipe expansion joint with flange union according to claim 3, characterized in that the sealing member is a packing or a sealing ring. 5. The detachable pressure steel pipe expansion joint with flange union according to claim 1, characterized in that an O-ring seal is arranged between the inner pipe flange and the connected pressure steel pipe flange, and the An O-ring seal is arranged between the outer pipe flange and the connected pressure steel pipe flange. 6. The detachable pressure steel pipe expansion joint with flange union according to claim 1, characterized in that the bellows is a single-wave thin-walled pipe or a multi-wave thin-walled pipe. 7. The detachable pressure steel pipe expansion joint with flange union according to claim 1, characterized in that there is a gap between the bellows and the wave core.