CN215806256U

CN215806256U - Reverse flange connection structure for high-pressure container

Info

Publication number: CN215806256U
Application number: CN202121986436.4U
Authority: CN
Inventors: 马明奇; 刘人锋; 于志刚
Original assignee: China First Heavy Industries Co Ltd; CFHI Dalian Engineering and Technology Co Ltd
Current assignee: China First Heavy Industries Co Ltd; CFHI Dalian Engineering and Technology Co Ltd
Priority date: 2021-08-23
Filing date: 2021-08-23
Publication date: 2022-02-11
Anticipated expiration: 2031-08-23

Abstract

The utility model relates to a reverse flange connecting structure for a high-pressure container, which comprises a shell ring, a reverse flange and a reverse flange cover, wherein the shell ring is welded with the lower end of a transition section of the reverse flange; the transition section of the reverse flange is not an annular straight plane but a reverse flange annular transition inclined plane, the wall thickness of the lower end of the reverse flange annular transition inclined plane is the same as that of the shell ring, the reverse flange annular transition inclined plane inclines upwards and inwards from the lower end, the inclination is smaller than 1:3, and the upper end of the reverse flange annular neck inclined plane is intersected with the upper part of the lower endpoint A of the reverse flange neck height to form two annular inclined planes taking the intersection line as a boundary. The beneficial effects are that: the structure is simple, the problem which needs to be solved by analysis and design originally is solved by using a conventional design method, and the design and manufacturing cost is low.

Description

Reverse flange connection structure for high-pressure container

Technical Field

The utility model belongs to the technical field of chemical machinery, and particularly relates to a connecting technology of a cylinder body and a seal head of a high-pressure container in the petrochemical industry, in particular to a connecting technology of a cylinder body and a seal head of a small-diameter high-pressure container with a large opening on the seal head of a petrochemical container.

Background

In the prior art, to the higher pressure vessel of pressure temperature, adopt spherical head and the mode of barrel connection to be connected more, to the high-pressure vessel of minor diameter, if have the manhole on the spherical head, often because the aperture ratio is great causes the problem that the trompil reinforcement calculation exceeds the standard scope. In order to solve the problem of the reinforcing overrun of the opening of the spherical seal head, an analytical design method is often adopted, so that the structure meets the standard requirement.

The method for analyzing and designing is adopted to complete the reinforcement calculation of the large opening of the spherical seal head, and the defects are as follows: 1. the design period of the equipment is prolonged; 2. the method has higher requirements on the analysis design level of a designer; 3. the large-diameter connecting pipe of the spherical seal head is provided with an opening for reinforcing, the thickness of the seal head is large, the weight of equipment is increased, the utilization rate of the seal head is extremely low due to the large opening, and the manufacturing cost of the equipment is high.

The reverse flange is designed according to the GB 150.1-150.4-2011 and the pressure container [ S ].2011 in the prior art, the neck of the reverse flange is a section of annular inclined plane, the height of the annular inclined plane is the height h of the neck of the reverse flange, the annular inclined plane inclines downwards and outwards from the top of the reverse flange, the wall thickness of the upper end of the annular inclined plane is the effective thickness delta of the large end of the neck of the flange, the connecting section of the reverse flange and the shell ring is an annular straight plane which is a transition section, the upper end of the annular straight plane is connected with the lower end of the annular inclined plane, and the wall thickness of the annular straight plane section is the same as that of the shell ring. The height h of the neck of the flange, the effective thickness delta of the large end of the neck of the flange and the height of the straight ring surface of the transition section are calculated by a calculation formula given by the standard.

Disclosure of Invention

The utility model aims to provide a reverse flange connecting structure for a high-pressure container, which replaces a spherical seal head in the prior art to enlarge a perforated pipe connecting flange structure, so that the material utilization rate is improved, the manufacturing difficulty is reduced, and the production cost is saved.

The technical scheme of the utility model is as follows: the utility model provides a reverse flange connection structure for high-pressure vessel, including the shell ring, reverse flange and reverse blind flange, shell ring and reverse flange changeover portion lower extreme welded connection, reverse flange links to each other through reverse flange stud and reverse flange nut with reverse blind flange, it is sealed through reverse flange octagon pad between reverse flange and the reverse blind flange, reverse flange neck is the reverse flange neck annular inclined plane of height for h, the wall thickness of reverse flange neck annular inclined plane upper end is neck main aspects effective thickness delta, its characterized in that: the reverse flange connecting structure for the high-pressure container is not provided with a spherical end socket; the transition section of the reverse flange is a reverse flange annular transition inclined plane, the wall thickness of the lower end of the reverse flange annular transition inclined plane is the same as that of the shell ring, the reverse flange annular transition inclined plane is inclined upwards and inwards from the lower end face, the inclination is smaller than 1:3, the upper end of the reverse flange annular transition inclined plane is intersected with the reverse flange annular neck inclined plane at the upper part of the lower endpoint A of the reverse flange neck height, and two annular inclined planes with the intersection line as the boundary are formed.

The utility model relates to a reverse flange connection structure for a high-pressure container, which is characterized in that: the height h of the flange neck and the effective thickness delta of the large end of the flange neck are calculated according to the specifications of GB 150.1-150.4-2011 and pressure vessel [ S ].2011 according to vessel design parameters.

The principle of the utility model is that the bevel edge transition structure for the common flange is applied to the reverse flange, and the seal head and the connecting pipe are integrated into the reverse flange, so that the reverse flange can meet the structural strength standard requirement and reduce the height of the whole reverse flange forging.

The utility model has the beneficial effects that:

1. the end socket and the connecting pipe are integrated into the reverse flange, so that the reverse flange can meet the structural strength standard requirement, the height of the whole reverse flange forging can be reduced, the structure can be simplified, and the manufacturing cost can be reduced.

2. The two welding seams of the connecting pipe and the seal head and the cylinder in the original structure are changed into one welding seam, so that the manufacturing cost of equipment is saved, and the manufacturability and the safety of the small-diameter high-pressure container with the large opening are improved.

3. The structure of the spherical seal head and the enlarged opening pipe connecting flange is simplified, the problem which can be solved only by analysis and design originally is solved by using a conventional design method, the design efficiency is improved, and the design cost is reduced.

4. Has reasonable structure, economical efficiency and wide practicability.

Drawings

FIG. 1 is a schematic view of a reverse flange connection structure of the present invention

FIG. 2 is a schematic view of a connection structure of a spherical head with a manhole and a flange in the prior art

FIG. 3 is a schematic view of a reverse flange structure of the prior art

In the figure, 1, a shell ring, 2, a spherical end socket, 3, a manhole flange, 4, a manhole flange cover, 5, a manhole flange stud, 6, a manhole flange nut, 7, a manhole flange octagonal pad, 8, a reverse flange annular neck inclined plane, 9, a reverse flange, 10, a reverse flange cover, 11, a reverse flange stud, 12, a reverse flange nut, 13, a reverse flange octagonal pad, 14, a reverse flange annular transition inclined plane, 15 and a transition straight plane connected with the reverse flange neck.

Detailed Description

The utility model is further described with reference to the following drawings and detailed description.

The high-pressure container is with the reverse flange connection structure, including shell ring 1, reverse flange 9 and reverse flange cover 10, shell ring 1 and reverse flange changeover portion lower extreme welded connection, reverse flange 9 and reverse flange cover 10 link to each other through reverse flange stud 11 and reverse flange nut 12, seal through reverse flange octagon cushion 13 between reverse flange 9 and the reverse flange cover 10, the reverse flange neck is the reverse flange neck annular inclined plane 8 with height h, the wall thickness of the reverse flange neck annular inclined plane upper end is the neck large-end effective thickness delta, the high-pressure container is with the reverse flange connection structure not setting up the spherical head; the transition section of the reverse flange is not a transition straight plane, but a reverse flange annular transition inclined plane 14, the wall thickness of the lower end of the reverse flange annular transition inclined plane is the same as that of the shell ring, the reverse flange annular transition inclined plane 14 upwards and inwards inclines from the lower end, the inclination is less than 1:3, the upper end of the reverse flange annular transition inclined plane 14 is intersected with the reverse flange annular neck inclined plane 8 at the upper part of the lower endpoint A of the reverse flange neck height, and two annular inclined planes taking the intersection line as a boundary are formed. The height h of the flange neck and the effective thickness delta of the flange neck large end are calculated by vessel design parameters according to the specification of GB 150.1-150.4-2011 and pressure vessel [ S ]. 2011.

Engineering examples

The design pressure of a certain high-pressure container is 17.48Mpa, the design temperature is 350 ℃, the inner diameter of the shell ring is 793mm, and the inner diameter of a manhole at the top of the equipment is 463 mm. The structural parameters of the top seal head and the manhole of the container with the structure of the utility model are as follows: according to GB 150.1-150.4-2011, the calculated height h of the neck of the reverse flange is 116mm, the effective thickness delta of the large end of the neck of the reverse flange is 130mm, the wall thickness of the lower end of the annular transition inclined plane of the reverse flange is 47mm, the wall thickness of the shell ring is 47mm, the height of the annular transition inclined plane of the reverse flange is 72mm, the inclination is less than 1:3, and the annular transition inclined plane of the reverse flange is intersected with the annular neck inclined plane of the reverse flange at the upper part of the lower endpoint A of the neck height of the reverse flange.

Claims

1. The utility model provides a reverse flange connection structure for high-pressure vessel, including shell ring (1), reverse flange (9) and reverse blind flange (10), shell ring (1) and reverse flange changeover portion lower extreme welded connection, reverse flange (9) link to each other through reverse flange stud (11) and reverse flange nut (12) with reverse blind flange (10), it is sealed through reverse flange octagon pad (13) between reverse flange (9) and reverse blind flange (10), reverse flange neck is reverse flange neck annular inclined plane (8) highly be h, the wall thickness of reverse flange neck annular inclined plane upper end is neck main aspects effective thickness delta, its characterized in that: the reverse flange connecting structure for the high-pressure container is not provided with a spherical end socket; the transition section of the reverse flange is a reverse flange annular transition inclined plane (14), the wall thickness of the lower end of the reverse flange annular transition inclined plane is the same as that of the shell ring, the reverse flange annular transition inclined plane (14) is inclined upwards and inwards from the lower end face, the inclination is smaller than 1:3, the upper end of the reverse flange annular transition inclined plane (14) is intersected with the reverse flange annular neck inclined plane (8) at the upper part of the lower endpoint A of the reverse flange neck height, and two annular inclined planes taking the intersection line as a boundary are formed.

2. The inverted flange connection structure for a high-pressure vessel according to claim 1, wherein: the height h of the flange neck and the effective thickness delta of the large end of the flange neck are calculated according to the specifications of GB 150.1-150.4-2011 and pressure vessel [ S ].2011 according to vessel design parameters.