阅读说明：本技术 一种颈口预设装配环的对焊法兰及其实施方法 (Welding neck flange with preset assembly ring and implementation method thereof ) 是由 赵�卓 蔡锟 于 2021-07-15 设计创作，主要内容包括：本发明公开了一种颈口预设装配环的对焊法兰及其实施方法,其中中环的外壁与上环接触,上环与中环的间隙中安装有变形块,上环和中环均与基础焊接环接触,具体的来说,截面呈横置“X”状的变形块在装配时具备一定的弹性,变形块的边角磨圆来减少应力集中现象,封环能避免外部杂质比如灰尘和水分侵入,保证洁净性,扣环段扣在底环与中环的间隙中,凸出段通过螺纹配合的方式连接基础焊接环,这样上环安装过程简单方便；同时本颈口预设装配环的对焊法兰的实施方法,先安装底环与上环,接着安装变形块和中环,最后将上环对准基础焊接环,接着旋转上环的外壁,使上环与基础焊接环螺纹配合,整个装配过程简单方便,同时对焊法兰拆装简单,实用性好。(The invention discloses a welding neck flange with a neck opening preset assembly ring and an implementation method thereof, wherein the outer wall of a middle ring is contacted with an upper ring, a deformation block is arranged in a gap between the upper ring and the middle ring, and both the upper ring and the middle ring are contacted with a basic welding ring; meanwhile, according to the implementation method of the welding neck flange with the neck opening preset assembly ring, the bottom ring and the upper ring are installed firstly, then the deformation block and the middle ring are installed, finally the upper ring is aligned to the basic welding ring, then the outer wall of the upper ring is rotated, and the upper ring is in threaded fit with the basic welding ring.)

1. The utility model provides a neck finish predetermines welded flange of collar, includes flange main part (1), flange neck (2) and collar (3), its characterized in that: the bottom end of the flange neck (2) is fixed with the flange main body (1), and the top end of the flange neck (2) is provided with an assembling ring (3);

the top at flange neck (2) is welded in assembly ring (3), and assembly ring (3) are including end ring (31), well ring (32), go up ring (33), seal ring (34), deformation piece (35) and basic welding ring (36), end ring (31) welding is on the top of flange neck (2), and the top edge of end ring (31) is fixed with well ring (32), and the outer wall and the contact of last ring (33) of well ring (32) are connected, install deformation piece (35) in the clearance of going up ring (33) and well ring (32), go up ring (33) and well ring (32) all with basic welding ring (36) contact.

2. The welding neck flange of a neck preset assembly ring according to claim 1, characterized in that: the section of the deformation block (35) is in a transverse X shape, the deformation block (35) is a member which is made of a metal material and is vertically symmetrical, and corners of the deformation block (35) are rounded.

3. The welding neck flange of a neck preset assembly ring according to claim 2, characterized in that: the bottom end of the upper ring (33) is provided with a seal ring (34), the seal ring (34) is in contact with the outer wall of the bottom ring (31), the upper ring (33) comprises a protruding section (331) and a snap ring section (332), and the bottom end of the protruding section (331) is fixed with the snap ring section (332).

4. A welding neck flange of a neck preassembly ring according to claim 3, characterized in that: the inner wall of the protruding section (331) is in contact with the middle ring (32), a chamfer is formed in the top end of the protruding section (331), grooves which are uniformly distributed are formed in the outer wall of the protruding section (331), internal threads are formed in the top end of the inner wall of the protruding section (331), and the protruding section (331) is connected with the basic welding ring (36) through the internal threads.

5. A welding neck flange of a neck preset assembly ring according to claim 4, characterized in that: the bottom surface of the buckle ring segment (332) is in contact with the bottom ring (31), the inner wall of the buckle ring segment (332) is in contact with the middle ring (32), the upper surface of the buckle ring segment (332) is in contact with the deformation block (35), and the deformation block (35) is also in contact with the inner wall of the protruding section (331).

6. A welding neck flange of a neck preset assembly ring according to claim 5, characterized in that: the bottom ring (31) is provided with an air passage (311) for starting, the top end of the air passage (311) extends into the bottom surface of the upper ring (33), and the outlet at the bottom end of the air passage (311) is positioned obliquely below the seal ring (34).

7. A welding neck flange of a neck preset assembly ring according to claim 6, characterized in that: the top end of the middle ring (32) is provided with a sealing ring groove (321), the middle ring (32) is also provided with a rubber sealing ring (37) in the sealing ring groove (321), and the upper surface of the middle ring (32) and the rubber sealing ring (37) are both contacted with the basic welding ring (36).

8. A welding neck flange of a neck preset assembly ring according to claim 7, characterized in that: the inner cavities of the bottom ring (31), the middle ring (32) and the basic welding ring (36) are the same in diameter, and the basic welding ring (36) is connected with a pipeline in a welding mode.

9. A method of implementing a welding neck flange of a neck preassembly ring according to claim 8, comprising the steps of:

s1: firstly, welding and fixing a bottom ring (31) at the top end of a flange neck (2), wherein the flange neck (2) is connected with a flange main body (1);

s2: then, the upper ring (33) is placed at the outer edge of the upper surface of the bottom ring (31), then the deformation blocks (35) are uniformly arranged at the edge of an inner cavity of the upper ring (33), the sealing ring (34) is clamped with the outer wall of the bottom ring (31), then the middle ring (32) is placed at the inner edge of the upper surface of the bottom ring (31), and the middle ring (32) and the bottom ring (31) are welded together;

s3: aligning the basic welding ring (36) to a welding position to be connected, and welding the basic welding ring (36) on the welding position in a welding mode;

s4: then, a rubber seal ring (37) is preset on the end face of the middle ring (32), then the whole flange body (1), the flange neck (2) and the assembling ring (3) are transversely arranged, then the upper ring (33) is aligned with the basic welding ring (36), and then the outer wall of the upper ring (33) is rotated, so that the upper ring (33) is in threaded fit with the basic welding ring (36).

Technical Field

The invention relates to a welding neck flange, in particular to a welding neck flange with a preset assembly ring at a neck opening and an implementation method thereof.

Background

A welding neck flange is a kind of pipe fitting, and refers to a flange which has a neck and a circular pipe transition and is connected with the pipe in a butt welding way. The welding neck flange is not easy to deform, has good sealing performance and wide application, has corresponding rigidity and elasticity requirements and reasonable butt welding thinning transition, has large distance between a welding opening and a joint surface, and prevents the joint surface from deforming under the welding temperature, adopts a relatively complex horn-shaped structure, is suitable for pipelines with greatly fluctuating pressure or temperature or high-temperature, high-pressure and low-temperature pipelines, and is generally used for connecting pipelines and valves with PN (positive-negative) pressure of more than 2.5 MPa; and is also used for pipelines for conveying expensive, inflammable and explosive media.

The welding neck flange is generally made by adopting a forging or forging and rolling process. The existing welding neck flange is generally installed beside a pipeline or a container in a welding mode during installation, so that the situation of difficult disassembly and assembly is caused, and the subsequent maintenance is difficult to perform. The open No. CN109140075A discloses a welding neck flange, which comprises a flange body, wherein the flange body comprises connecting hole guide holes and a neck platform, bosses are arranged at the bottoms of two groups of flange bodies, a semicircular limiting block is arranged at the left side of the bottom of each boss, an annular sealing gasket I is arranged at the bottom of each annular limiting block, a semicircular limiting groove matched with each annular limiting block is arranged at the right side of the bottom of each boss, an annular sealing gasket II matched with each annular sealing gasket I is arranged at the top in each annular limiting groove, and a welding hole is formed in one side of the opposite surface of the outer wall of the neck platform; it has improved the steadiness when pipe and neck platform weld mutually through set up the welding hole on the neck platform, prevents the condition that relative displacement appears after the long-time use of welding flange through annular stopper and annular spacing groove. Although the present invention can improve the mounting stability, the problem of difficulty in mounting and dismounting cannot be solved at all, and the practicability is affected.

Disclosure of Invention

The invention aims to provide a welding neck flange with a preset assembly ring at a neck opening and an implementation method thereof.

In order to achieve the purpose, the invention provides the following technical scheme:

a welding neck flange with a neck opening provided with an assembly ring comprises a flange main body, a flange neck and the assembly ring, wherein the bottom end of the flange neck is fixed with the flange main body, and the assembly ring is installed at the top end of the flange neck;

the assembly ring welds on the top of flange neck, and the assembly ring includes end ring, zhonghuan, fits with a contraceptive ring, seal ring, deformation piece and basic welding ring, the end ring welds on the top of flange neck, and the top edge of end ring is fixed with the zhonghuan, and the outer wall of zhonghuan is connected with the contact of fitting with a contraceptive ring, install the deformation piece in the clearance of fitting with a contraceptive ring and the zhonghuan, fit with a contraceptive ring and all contact with basic welding ring.

Furthermore, the section of the deformation block is in a transverse X shape, the deformation block is a member which is made of a metal material and is vertically symmetrical, and corners of the deformation block are rounded.

Furthermore, the bottom of fitting with a contraceptive ring installs the seal ring, and the seal ring contacts with the outer wall of end ring, and it includes protruding section and buckle ring section to fit with a contraceptive ring, and the bottom and the buckle ring section of protruding section are fixed.

Further, the inner wall of the protruding section contacts with the middle ring, the top end of the protruding section is provided with a chamfer, the outer wall of the protruding section is provided with uniformly distributed grooves, the top end of the inner wall of the protruding section is provided with an internal thread, and the protruding section is connected with the basic welding ring through the internal thread.

Furthermore, the bottom surface of the buckling ring section is in contact with the bottom ring, the inner wall of the buckling ring section is in contact with the middle ring, the upper surface of the buckling ring section is in contact with the deformation block, and the deformation block is also in contact with the inner wall of the protruding section.

Furthermore, the bottom ring is internally provided with an air channel, the top end of the air channel extends into the bottom surface of the upper ring, and the outlet at the bottom end of the air channel is positioned at the oblique lower part of the sealing ring.

Furthermore, a sealing ring groove is formed in the top end of the middle ring, a rubber sealing ring is further installed in the sealing ring groove of the middle ring, and the upper surface of the middle ring and the rubber sealing ring are both in contact with the basic welding ring.

Furthermore, the diameters of the inner cavities of the bottom ring, the middle ring and the basic welding ring are the same, and the basic welding ring is connected with a pipeline in a welding mode.

The invention provides a method for implementing a welding neck flange with a preset assembly ring at a neck opening, which comprises the following steps:

s1: firstly, welding and fixing a bottom ring at the top end of a flange neck, wherein the flange neck is connected with a flange main body;

s2: then, the upper ring is placed at the outer edge of the upper surface of the bottom ring, then the deformation blocks are uniformly arranged at the edge of an inner cavity of the upper ring, the sealing ring is clamped with the outer wall of the bottom ring at the moment, then the middle ring is placed at the inner edge of the upper surface of the bottom ring, and the middle ring and the bottom ring are welded together;

s3: aligning the basic welding ring to the welding position to be connected, and welding the basic welding ring on the welding position in a welding mode;

s4: then the rubber seal ring is preset on the end face of the middle ring, then the whole flange main body, the flange neck and the assembling ring are transversely arranged, then the upper ring is aligned to the basic welding ring, and then the outer wall of the upper ring is rotated, so that the upper ring is in threaded fit with the basic welding ring.

Compared with the prior art, the invention has the beneficial effects that: the invention provides a welding neck flange with a neck opening provided with an assembly ring and an implementation method thereof, wherein a bottom ring is welded at the top end of a flange neck, the outer wall of a middle ring is contacted with an upper ring, and a deformation block is arranged in a gap between the upper ring and the middle ring, so that when the assembly ring is assembled, the deformation block plays a role in supporting the upper ring and the middle ring, the upper ring and the middle ring are both contacted with a basic welding ring, wherein the basic welding ring is a fixed part, and other accessories in the assembly ring are movable parts. Specifically, the deformation block with the cross section in the shape of a transverse X has certain elasticity during assembly, corners of the deformation block are rounded to reduce the stress concentration phenomenon, meanwhile, the seal ring can avoid external impurities such as dust and moisture from invading, and cleanness is guaranteed, wherein the upper ring comprises a convex section and a fastening ring section, the fastening ring section is fastened in a gap between the bottom ring and the middle ring, and the convex section is connected with the basic welding ring in a threaded matching mode, so that the upper ring installation process is simple and convenient, the rubber sealing ring plays a role in sealing, and the medium leakage in the flange is avoided; meanwhile, according to the implementation method of the welding neck flange with the neck opening preset assembly ring, the bottom ring and the upper ring are installed firstly, then the deformation block and the middle ring are installed, finally the upper ring is aligned to the basic welding ring, then the outer wall of the upper ring is rotated, and the upper ring is in threaded fit with the basic welding ring.

Drawings

FIG. 1 is a schematic cross-sectional view of the overall structure of the present invention;

FIG. 2 is a schematic view of the welded bottom ring of the present invention;

FIG. 3 is a schematic view of the assembled middle ring of the present invention;

FIG. 4 is a schematic view of the basic weld ring of the present invention after joining;

FIG. 5 is a cross-sectional view of the mounting ring structure in an initial state of the present invention;

FIG. 6 is a cross-sectional view of the assembled ring structure of the present invention after installation;

FIG. 7 is a cross-sectional view of a middle ring of the present invention;

FIG. 8 is a schematic view of a middle ring structure of the present invention;

fig. 9 is a schematic structural diagram of a deformation block according to the present invention.

In the figure: 1. a flange body; 2. a flange neck; 3. assembling a ring; 31. a bottom ring; 311. an air duct; 32. a middle ring; 321. sealing the ring groove; 33. ring fitting; 331. a protruding section; 332. a snap ring segment; 34. sealing a ring; 35. a deformation block; 36. a base weld ring; 37. a rubber seal ring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-9, a welding neck flange with a neck opening provided with an assembly ring comprises a flange main body 1, a flange neck 2 and an assembly ring 3, wherein the axes of the flange main body 1, the flange neck 2 and the assembly ring 3 are superposed, the bottom end of the flange neck 2 is fixed with the flange main body 1, and the top end of the flange neck 2 is provided with the assembly ring 3; the assembling ring 3 is welded at the top end of the flange neck 2, the assembling ring 3 comprises a bottom ring 31, a middle ring 32, an upper ring 33, a sealing ring 34, a deformation block 35 and a basic welding ring 36, the bottom ring 31 is welded at the top end of the flange neck 2, the upper edge of the bottom ring 31 is fixed with the middle ring 32, the outer wall of the middle ring 32 is in contact connection with the upper ring 33, the deformation block 35 is installed in the gap between the upper ring 33 and the middle ring 32, wherein the corners of the deformation block 35 are in contact with the inner cavity walls of the middle ring 32 and the upper ring 33, the deformation block 35 is made of metal materials, the deformation block 35 has certain elasticity, thus when the assembling ring 3 is assembled, the deformation block 35 plays a role of supporting the upper ring 33 and the middle ring 32, the upper ring 33 and the middle ring 32 are in contact with the basic welding ring 36, the diameters of the inner cavities of the bottom ring 31, the middle ring 32 and the basic welding ring 36 are the same, the basic welding ring 36 is connected with a pipeline in a welding mode, wherein the basic welding ring 36 is welded at a preset position, i.e., the base weld ring 36 is a stationary member and the other components in the mounting ring 3 are moving members.

Referring to fig. 9, the deformation block 35 has a cross-section in a horizontal "X" shape, wherein during assembly, the deformation blocks 35 are uniformly disposed inside the upper ring 33 and the middle ring 32, the deformation blocks 35 are made of a metal material and are symmetrical up and down, such that the deformation blocks 35 have a certain elasticity, when the assembly ring 3 is assembled, the deformation blocks 35 support the upper ring 33 and the middle ring 32, corners of the deformation blocks 35 are rounded, and by reducing edges and corners of the deformation blocks 35, a stress concentration phenomenon during the use of the deformation blocks 35 can be reduced, thereby not only improving the strength of the deformation blocks and improving the durability of the deformation blocks.

Referring to fig. 7 and 8, a seal ring 34 is mounted at the bottom end of the upper ring 33, the seal ring 34 is in contact with the outer wall of the bottom ring 31, wherein the seal ring 34 is mounted to prevent external impurities such as dust from entering, so as to ensure cleanliness and prevent corrosion due to moisture infiltration, the seal ring 34 does not affect the movement of the upper ring 33, the upper ring 33 includes a protruding section 331 and a retaining ring section 332, and the bottom end of the protruding section 331 is fixed to the retaining ring section 332; the snap ring segment 332 is buckled in a gap between the bottom ring 31 and the middle ring 32, meanwhile, the snap ring segment 332 is connected with the middle ring 32 through the deformation block 35, the inner wall of the protruding section 331 is contacted with the middle ring 32, the top end of the protruding section 331 is provided with a chamfer which is convenient to mount, the outer wall of the protruding section 331 is provided with uniformly distributed grooves which are used for increasing friction force, therefore, the upper ring 33 can be rotated more conveniently, the top end of the inner wall of the protruding section 331 is provided with an internal thread, the protruding section 331 is connected with the basic welding ring 36 through the internal thread, namely, the upper ring 33 is connected with the basic welding ring 36 through a thread matching mode; the bottom surface of the snap ring segment 332 contacts with the bottom ring 31, the inner wall of the snap ring segment 332 contacts with the middle ring 32, the upper surface of the snap ring segment 332 contacts with the deformation block 35, the deformation block 35 also contacts with the inner wall of the protrusion segment 331, that is, the snap ring segment 332 is snapped in the gap between the bottom ring 31 and the middle ring 32, and meanwhile, the snap ring segment 332 is connected with the middle ring 32 through the deformation block 35.

Referring to fig. 5-7, the bottom ring 31 starts to use the air passage 311, the top end of the air passage 311 extends to the bottom surface of the upper ring 33, and the bottom end outlet of the air passage 311 is located obliquely below the seal ring 34, wherein the purpose of opening the air passage 311 is that the upper ring 33 and the seal ring 34 will move during the process of screwing the upper ring 33, and the air passage 311 needs to be opened to ensure that the air pressure of the upper ring 33, the seal ring 34 and the bottom ring 31 is the same as the external air pressure because the seal ring 34 contacts the bottom ring 31.

Referring to fig. 7, a sealing ring groove 321 is formed at the top end of the middle ring 32, a rubber sealing ring 37 is further installed in the sealing ring groove 321 of the middle ring 32, the sealing ring groove 321 is used for reserving a position for the rubber sealing ring 37, the upper surface of the middle ring 32 and the rubber sealing ring 37 are both in contact with the basic welding ring 36, that is, after the middle ring 32 is assembled, the rubber sealing ring 37 is clamped in a gap between the middle ring 32 and the basic welding ring 36, and the rubber sealing ring 37 plays a role in sealing, so as to prevent a medium in the flange from leaking.

A method for implementing a welding neck flange with a prearranged assembly ring at a neck opening comprises the following steps:

the first step is as follows: firstly, welding and fixing a bottom ring 31 at the top end of a flange neck 2, wherein the flange neck 2 is connected with a flange main body 1;

the second step is that: then, the upper ring 33 is placed at the outer edge of the upper surface of the bottom ring 31, then the deformation blocks 35 are uniformly arranged at the edge of the inner cavity of the upper ring 33, the sealing ring 34 is clamped with the outer wall of the bottom ring 31, then the middle ring 32 is placed at the inner edge of the upper surface of the bottom ring 31, and the middle ring 32 and the bottom ring 31 are welded together;

the third step: aligning the basic welding ring 36 to the welding position to be connected, and welding the basic welding ring 36 on the welding position in a welding mode;

the fourth step: then, a rubber seal ring 37 is prepared on the end face of the middle ring 32, then the entire flange body 1, flange neck 2 and mounting ring 3 are put transversely, then the upper ring 33 is aligned with the base weld ring 36, and then the outer wall of the upper ring 33 is rotated to screw-fit the upper ring 33 with the base weld ring 36.

The welding neck flange with the neck opening provided with the assembly ring comprises a flange main body 1, a flange neck 2 and an assembly ring 3, wherein the bottom end of the flange neck 2 is fixed with the flange main body 1, and the top end of the flange neck 2 is provided with the assembly ring 3; the assembly ring 3 welds the top at flange neck 2, the assembly ring 3 includes end ring 31, middle ring 32, upper ring 33, seal ring 34, deformation piece 35 and basic weld ring 36, end ring 31 welds the top at flange neck 2, the outer wall and the upper ring 33 contact of middle ring 32, install deformation piece 35 in the clearance of upper ring 33 and middle ring 32, wherein, deformation piece 35 adopts metal material to make, deformation piece 35 possesses certain elasticity, when assembly ring 3 assembles like this, deformation piece 35 plays the effect of supporting upper ring 33 and middle ring 32, upper ring 33 and middle ring 32 all contact with basic weld ring 36, wherein basic weld ring 36 is the mounting, and other accessories in the assembly ring 3 are the moving part. Specifically, the deformation block 35 with a cross section in a transverse X shape has certain elasticity during assembly, the deformation block 35 supports the upper ring 33 and the middle ring 32, corners of the deformation block 35 are rounded, the stress concentration phenomenon in the use process of the deformation block 35 can be reduced, meanwhile, the bottom end of the upper ring 33 is provided with the seal ring 34, the seal ring 34 can avoid invasion of external impurities such as dust and moisture, and cleanness is guaranteed, the upper ring 33 comprises a protruding section 331 and a buckle section 332, wherein the buckle section 332 is buckled in a gap between the bottom ring 31 and the middle ring 32, meanwhile, the buckle section 332 is connected with the middle ring 32 through the deformation block 35, the outer wall of the protruding section 331 is provided with uniformly distributed grooves which are used for increasing friction force, the top end of the inner wall of the protruding section 331 is provided with an internal thread, and thus, the upper ring 33 is connected with the base welding ring 36 in a thread matching manner; the air passage 311 is used in the bottom ring 31 to ensure that the air pressure of the upper ring 33, the seal ring 34 and the bottom ring 31 is the same as the outside air pressure, after the middle ring 32 is assembled, the rubber seal ring 37 is clamped in the gap between the middle ring 32 and the base welding ring 36, and the rubber seal ring 37 plays a role in sealing to avoid the leakage of media in the flange. The method for implementing the welding neck flange of the neck opening preset assembly ring comprises the steps of firstly welding and fixing a bottom ring 31 at the top end of a flange neck 2, then placing an upper ring 33 at the outer edge of the upper surface of the bottom ring 31, then the deformation block 35 is uniformly arranged at the inner cavity edge of the upper ring 33, at the moment, the seal ring 34 is clamped with the outer wall of the bottom ring 31, then, the middle ring 32 is placed at the inner edge of the upper surface of the bottom ring 31, the middle ring 32 and the bottom ring 31 are welded together, the basic welding ring 36 is aligned to the welding position to be connected, then the basic welding ring 36 is welded on the welding position by welding, then, a rubber seal ring 37 is preset on the end face of the middle ring 32, and then the entire flange body 1, flange neck 2 and fitting ring 3 are transversely placed, the upper ring 33 is then aligned with the ground weld ring 36 and the outer wall of the upper ring 33 is rotated to threadably engage the upper ring 33 with the ground weld ring 36.

In summary, the present invention provides a welding neck flange with a preassembly ring for neck and a method for implementing the same, wherein a bottom ring 31 is welded on the top end of a flange neck 2, the outer wall of an intermediate ring 32 is in contact with an upper ring 33, and a deformation block 35 is installed in the gap between the upper ring 33 and the intermediate ring 32, so that when the assembling ring 3 is assembled, the deformation block 35 plays a role of supporting the upper ring 33 and the intermediate ring 32, the upper ring 33 and the intermediate ring 32 are both in contact with a base welding ring 36, wherein the base welding ring 36 is a fixed part, and other parts in the assembling ring 3 are movable parts. Specifically, the deformation block 35 with a cross section in a transverse X shape has certain elasticity during assembly, corners of the deformation block 35 are rounded to reduce stress concentration, meanwhile, the seal ring 34 can prevent external impurities such as dust and moisture from invading, and cleanness is guaranteed, wherein the upper ring 33 comprises a protruding section 331 and a snap ring section 332, the snap ring section 332 is buckled in a gap between the bottom ring 31 and the middle ring 32, and the protruding section 331 is connected with the basic welding ring 36 in a threaded fit manner, so that the installation process of the upper ring 33 is simple and convenient, and the rubber seal ring 37 plays a role in sealing, and prevents media in the flange from leaking; meanwhile, according to the implementation method of the welding neck flange with the neck opening preset assembly ring, the bottom ring 31 and the upper ring 33 are installed firstly, then the deformation block 35 and the middle ring 32 are installed, finally the upper ring 33 is aligned to the basic welding ring 36, then the outer wall of the upper ring 33 is rotated, so that the upper ring 33 is in threaded fit with the basic welding ring 36, the whole assembly process is simple and convenient, meanwhile, the welding neck flange is easy to disassemble and assemble, and the practicability is good.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.