CN219570838U - Novel flexible structure for sealing jacket of pressure vessel - Google Patents

Abstract

The utility model provides a novel flexible structure for sealing a pressure vessel jacket, which comprises a pressure vessel inner cylinder, a pressure vessel jacket positioned at the outer side of the pressure vessel inner cylinder, and a flexible device for connecting the pressure vessel inner cylinder and the pressure vessel jacket, wherein the flexible device consists of a circular pipe and a circular arc-shaped expansion joint, the circular pipe is connected with the pressure vessel inner cylinder in a welding way, and the circular arc-shaped expansion joint is connected with the pressure vessel jacket in a welding way; the jacket type pressure vessel has the advantages that the jacket type pressure vessel can be pressurized, decompressed, heated, cooled and the like in the use process, the inner cylinder of the pressure vessel and the jacket of the pressure vessel can generate thermal expansion difference and pressure change to generate great deformation due to different wall temperatures, and the flexible device can compensate the thermal expansion difference generated by different wall temperatures of the inner cylinder of the pressure vessel and the jacket of the pressure vessel by virtue of the advantages of great flexibility and coordinated deformation, so that the temperature difference stress can be reduced, the stress concentration can be reduced, and the fatigue life of equipment can be prolonged.

Description

Novel flexible structure for sealing jacket of pressure vessel

Technical Field

The utility model relates to the field of pressure vessels, in particular to a novel flexible structure for jacket sealing of a pressure vessel.

Background

The jacket type pressure vessel belongs to a typical two-cavity heat exchange type pressure vessel, and has wide application in various aspects of petrochemical industry. The jacket type pressure vessel is mainly in a heat exchange mode, and is provided with an inner cylinder and two jacket cavities, wherein the two cavities respectively have different working pressures, temperatures, media and volumes. The jacket pressure vessel can be divided into a full jacket vessel and a partial jacket vessel according to the wrapping degree of the jacket, wherein the cylinder body and the upper and lower seal heads of the inner cylinder of the vessel are wrapped by the jacket, and the partial cylinder body or the seal head of the inner cylinder is wrapped by the jacket. The jacket of the cylindrical jacket pressure vessel has 6 different connection modes (including circular, conical, flat plate, angle steel and the like) with the sealing structure of the inner cylinder, and the use conditions of various structures are limited according to different structural modes. At present, the connection of the spout, flange, through the jacket closure is often in the two configurations of figures 3 and 4 of GB 150.3-2011. In the actual manufacturing process, the jacket in fig. 3 is deformed by bending deformation, and a thermal processing method such as flame local heating is sometimes adopted to reduce deformation resistance, so that not only is the manufacturing process complicated and the dimensional accuracy difficult to meet the design requirement, but also the subsequent thermal treatment process is added due to the deformation amount, the thermal process and other reasons, while the manufacturing process in fig. 4 is simple, but the problem that the technical scheme is needed to be solved in the field of manufacturing the jacket type pressure vessel at present is that the welding seam between the jacket and the sleeve is easy to leak under the action of fatigue stress and temperature difference stress due to stress concentration because of frequent pressurization, pressure relief, temperature rise and temperature reduction are reported from the use experience of customers.

Expansion joints in the heat exchanger can effectively compensate for axial deformations. The expansion joint welded on the shell of the fixed tube-sheet heat exchanger has large axial flexibility and easy deformation, can compensate the thermal expansion difference of the tube and the shell caused by different wall temperatures, and reduces the axial load of the tube and the shell, thereby reducing the temperature difference stress of the tube, the tube sheet and the shell, avoiding causing strength damage, and solving the problems by using a novel flexible structure to seal the jacket and the cylinder of the pressure vessel in the connection of the tube orifice or the flange penetrating through the jacket sealing piece by referring to the principle.

Disclosure of Invention

The utility model aims to solve the technical problems that the existing welding seam between the jacket of the pressure vessel and the inner barrel of the pressure vessel is easy to leak under the action of fatigue stress and temperature difference stress due to stress concentration, and the safety is influenced.

The technical scheme adopted for solving the technical problems is as follows: the utility model provides a novel flexible construction for pressure vessel presss from both sides sealed, includes the pressure vessel inner tube, is located the pressure vessel presss from both sides the pressure vessel inner tube outside the pressure vessel presss from both sides the flexible device of cover, the flexible device comprises pipe and convex telescopic joint, the pipe with pressure vessel inner tube welded connection, convex telescopic joint with pressure vessel presss from both sides cover welded connection.

Further: the inner diameter of the circular tube is the same as the diameter of the innermost ring of the circular arc-shaped expansion joint.

Further: the thickness of the circular tube is larger than that of the circular arc-shaped expansion joint.

Further: the circular tube and the circular arc-shaped expansion joint are integrally formed.

Further: the circular tube is connected with the circular arc-shaped expansion joint through welding.

Further: the flexible device is integrally processed and molded or welded and then subjected to heat treatment to eliminate stress.

The beneficial effects of the utility model are as follows:

(1) The flexible device has large flexibility and can coordinate deformation, can compensate the thermal expansion difference of the inner cylinder of the pressure container and the jacket of the pressure container due to different wall temperatures, reduces the temperature difference stress, simultaneously reduces the stress concentration, prolongs the fatigue life, and effectively reduces the occurrence of the leakage condition of the original structure.

(2) Simple structure, simple and convenient manufacturing process can be used for element mass production. The traditional jacket manufacturing process needs to concave and deform the jacket at the connecting part of the jacket and the inner cylinder, so that the manufacturing process is complex, and the dimensional accuracy is difficult to meet the design requirement.

(3) The flexible device can be subjected to independent heat treatment, so that the heat treatment difficulty is reduced, the heat treatment efficiency is improved, and the energy conservation and emission reduction are realized. The traditional pressure vessel jacket can increase the subsequent heat treatment procedures due to the processing deformation of the pressure vessel jacket or the use of a heat process and the like, and the local heat treatment and the whole heat treatment are time-consuming and labor-consuming.

Drawings

The utility model will be further described with reference to the drawings and examples.

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is an expanded schematic view of the flexible device;

fig. 3 and 4 are schematic views of the structure of a jacket closure according to the prior art.

In the figure, 1, an inner cylinder of a pressure vessel, 2, a jacket of the pressure vessel, 3, a flexible device, 4, a circular tube, 5 and a circular arc expansion joint.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model. On the contrary, the embodiments of the utility model include all alternatives, modifications and equivalents as may be included within the spirit and scope of the appended claims.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art. Furthermore, in the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present utility model in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present utility model.

As shown in fig. 1 and 2, the utility model provides a novel flexible structure for sealing a pressure vessel jacket, which comprises a pressure vessel inner cylinder 1, a pressure vessel jacket 2 positioned outside the pressure vessel inner cylinder 1, and a flexible device 3 for connecting the pressure vessel inner cylinder 1 and the pressure vessel jacket 2, wherein the flexible device 3 consists of a circular tube 4 and a circular arc-shaped expansion joint 5, the circular tube 4 is in welded connection with the pressure vessel inner cylinder 1, and the circular arc-shaped expansion joint 5 is in welded connection with the pressure vessel jacket 2.

The jacket type pressure vessel meets the conditions of pressurization, pressure relief, temperature rise, temperature reduction and the like in the use process, the pressure vessel inner cylinder 1 and the pressure vessel jacket 2 can generate thermal expansion difference and pressure change to generate great deformation due to different wall temperatures, and the flexible device 3 can compensate the thermal expansion difference generated by different wall temperatures of the pressure vessel inner cylinder 1 and the pressure vessel jacket 2 by virtue of the advantages of great flexibility and coordinated deformation, can reduce temperature difference stress, reduce stress concentration, prolong the fatigue life of equipment and effectively reduce the occurrence of leakage conditions.

The inner diameter of the circular tube 4 is the same as the diameter of the innermost ring of the circular arc-shaped expansion joint 5; the geometry of the flexible device 3 is characterized by a body of revolution having a radial section of "J", wherein the "J" shape is constituted by a semicircle and a line segment which smoothly transitions with the semicircle.

The thickness of the circular tube 4 is larger than that of the circular arc-shaped expansion joint 5; the round tube 4 and the circular arc-shaped expansion joint 5 are integrally formed; the circular tube 4 and the circular arc-shaped expansion joint 5 are connected through welding; the flexible device 3 is integrally formed or welded and then subjected to heat treatment to relieve stress.

One side of the circular tube 4 is welded with the circular arc-shaped expansion joint 5 or integrally processed and molded to form the flexible device 3, and then the flexible device 3 is subjected to heat treatment to eliminate stress, and the circular arc-shaped expansion joint 5 is kept away from the opening of the pressure vessel jacket 2 as far as possible when being welded with the pressure vessel jacket 2, so that the safety of the whole structure is ensured.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

With the above-described preferred embodiments according to the present utility model as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present utility model. The technical scope of the present utility model is not limited to the description, but must be determined according to the scope of claims.

Claims (2)

1. The utility model provides a novel flexible construction for pressure vessel presss from both sides cover seal, includes pressure vessel inner tube (1), is located pressure vessel presss from both sides cover (2) in the outside of pressure vessel inner tube (1), connects pressure vessel inner tube (1) with flexible device (3) of pressure vessel presss from both sides cover (2), its characterized in that: the flexible device (3) consists of a circular tube (4) and a circular arc-shaped expansion joint (5), the circular tube (4) is welded with the inner cylinder (1) of the pressure container, and the circular arc-shaped expansion joint (5) is welded with the jacket (2) of the pressure container; the flexible device (3) is integrally processed and molded or welded and then subjected to heat treatment to eliminate stress; the inner diameter of the circular tube (4) is the same as the diameter of the innermost ring of the circular arc-shaped expansion joint (5); the thickness of the circular tube (4) is larger than that of the circular arc-shaped expansion joint (5); the round tube (4) and the circular arc-shaped expansion joint (5) are integrally formed.

2. A novel flexible structure for jacket closure of a pressure vessel according to claim 1, wherein: the round tube (4) is connected with the circular arc-shaped expansion joint (5) through welding.