Flange assembly for pipe fitting connection

Abstract

The invention discloses a flange assembly for pipe fitting connection, and belongs to the technical field of flanges, the flange assembly for pipe fitting connection comprises a first flange plate and a second flange plate, the outer side of the first flange plate and the outer side of the second flange plate are fixedly connected with a first welding part and a second welding part respectively; a first butt joint part and a second butt joint part are fixedly connected to the inner sides of the first flange plate and the second flange plate correspondingly, and annular sealing grooves are formed in the centers of the opposite sides of the first butt joint part and the second butt joint part correspondingly. By designing a reinforcing structure, after the corresponding limiting protrusions or limiting columns are clamped in the corresponding arc-shaped grooves in a sliding mode, auxiliary fixing and limiting between the first butt joint part and the second butt joint part can be rapidly completed, and when the pressure of a medium in a pipeline is too large or part of fastening bolts are loosened, auxiliary fixing and limiting between the first butt joint part and the second butt joint part can be rapidly completed. The first butt joint part and the second butt joint part are not easy to loosen or shake, so that the connection tightness between the first flange plate and the second flange plate is further ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of flanges, and in particular relates to a flange assembly for connecting pipe fittings. Background Art

[0002] Pipe flange refers to the flange used for piping in pipeline installations. Pipe flanges are parts that connect pipes to each other and are used to connect pipe ends. There are holes on the flanges. Bolts are usually used to connect the two flanges, and gaskets are used to seal the flanges. Flanges are divided into threaded connection (threaded connection) flanges, welding flanges and clamp flanges. Flanges are used in pairs. Low-pressure pipelines can use threaded flanges or clamp flanges. Welded flanges are used for pressures above four kilograms. Gaskets are added between the two flanges and then tightened with bolts. Pipeline connection flanges mostly use welding flanges. Welding flanges are usually divided into flat welding flanges and butt welding flanges. Flat welding flanges are mostly used in situations where the medium conditions are relatively mild, such as low-pressure non-purified compressed air and low-pressure circulating water; butt welding flanges are also the most commonly used type. They are butt-welded to the pipe, and the quality of the welding joint is relatively good. In addition, the neck of the flange uses a taper transition, which can withstand harsh conditions.

[0003] Pipe flange is the most common connection component in pipeline connection. There are various types of pipe flange components on the market, but the structure of most pipe flange components is too simple. Usually there are only two flanges. When connecting, a sealing gasket is installed between the two flanges, and then they are directly fastened with multiple sets of fixing bolts. Although this flange structure can achieve connection and sealing effects, it is easy to leak when the medium pressure in the pipeline is too high. Secondly, although this method of fastening with bolts alone is firm, due to the lack of pre-positioning structure, it is relatively difficult to align the pipe with the hole during the actual assembly process, which will affect the assembly speed and efficiency. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the disadvantages of the above-mentioned prior art and provide a flange assembly for pipe connection with good sealing effect and high tightness.

[0005] The technical solution adopted to solve the above technical problems is: a flange assembly for pipe connection, comprising a first flange and a second flange, wherein the first flange and the second flange are respectively provided with a plurality of first flange holes and a plurality of second flange holes on the circumference thereof, and the first flange and the second flange are respectively fixedly connected with a first welding portion and a second welding portion on the outer sides thereof; The first and second butt joints are fixedly connected to the inner sides of the first and second flanges, respectively; an annular sealing groove is respectively formed at the center of the first and second butt joints on opposite sides; a sealing gasket is installed between the two annular sealing grooves; A reinforcement structure is arranged on the outer side between the first butting portion and the second butting portion, and a plurality of sets of fastening bolts are installed between the first flange and the second flange.

[0006] Furthermore, the first flange, the first welding portion and the first docking portion are an integrated structure, and the second flange, the second welding portion and the second docking portion are an integrated structure.

[0007] Through the above technical solution, the overall structure is made simpler and easier to assemble quickly.

[0008] Furthermore, the first welding portion and the second welding portion are respectively connected to corresponding pipes by welding.

[0009] Through the above technical solution, welding fixation can ensure the firmness and stability of the connection, and the welding method can be selected as flat welding or butt welding.

[0010] Furthermore, the sealing gasket comprises a sealing ring body, and annular sealing protrusions are arranged on both sides of the outer wall of the sealing ring body.

[0011] Through the above technical solution, the sealing gasket can achieve a sealing effect between the first butt joint part and the second butt joint part.

[0012] Furthermore, the sealing ring body and the annular sealing protrusion are integrally injection-molded from a rubber material, and the annular sealing protrusions on both sides of the sealing ring body are respectively engaged in two annular sealing grooves.

[0013] Through the above technical solution, in the assembled state, the annular sealing protrusions on both sides of the sealing ring body are respectively engaged in the two annular sealing grooves by adopting a snap-fitting method, and the sealing ring body is clamped by using the end faces of the first docking part and the second docking part, so that a stable seal between the first docking part and the second docking part can be achieved, thereby ensuring the sealing properties and sealing quality between the first docking part and the second docking part.

[0014] Further, the reinforcement structure is a first reinforcement structure, the first reinforcement structure includes two first arc grooves and two second arc grooves, a reinforcement sleeve is sleeved between the first docking part and the second docking part, two first limiting protrusions and two second limiting protrusions are fixedly connected to the top and bottom sides of the inner wall of the reinforcement sleeve, and the first connecting plate and the second connecting plate are fixedly connected to the outer wall of the reinforcement sleeve on both sides, and a plurality of evenly distributed mounting holes are opened on the peripheral sides of the first connecting plate and the second connecting plate, and a plurality of limiting sleeves that are connected to the mounting holes are fixedly connected to the peripheral sides of the inner walls of the first connecting plate and the second connecting plate, and the front and rear ends of the outer wall of the reinforcement sleeve are fixedly connected to fixing blocks, and the centers of the two fixing blocks are opened with strip through holes.

[0015] Through the above technical scheme, when connecting, first put the reinforcing pipe sleeve on the outer wall of the first docking part, and make the two first limiting protrusions slide and limit in the two first arc grooves until the first connecting plate of the reinforcing pipe sleeve fits with the first flange plate, then insert the sealing gasket into the reinforcing pipe sleeve, and make the annular sealing protrusion on one side of the sealing gasket engage in the annular sealing groove on the end face of the first docking part, and then put the second docking part into the reinforcing pipe sleeve, and similarly make the second limiting protrusion slide and limit in the two second arc grooves until the second connecting plate of the reinforcing pipe sleeve fits with the second flange plate, at this time, the positioning and limiting of the reinforcing pipe sleeve are completed, and during the assembly process, the reinforcing pipe sleeve can be rotated and adjusted by the fixing block, so as to facilitate the operation.

[0016] Furthermore, the two first arc-shaped grooves are respectively opened at the top and bottom of the outer wall of the first docking part, and the two second arc-shaped grooves are respectively opened at the top and bottom of the outer wall of the second docking part. In the combined state, the two first limiting protrusions are respectively slidably positioned in the two first arc-shaped grooves, and the two second limiting protrusions are respectively slidably positioned in the two second arc-shaped grooves.

[0017] Through the above technical scheme, by using the reinforcement pipe sleeve to be sleeved between the first docking part and the second docking part, and using the two groups of first limiting protrusions and the second limiting protrusions for sliding guidance and limiting, the installation and positioning of the reinforcement pipe sleeve can be quickly completed, and at the same time, the pre-positioning and precise alignment of multiple groups of first flange holes, second flange holes and installation holes can be quickly completed, thereby making it more convenient to lock and fix multiple groups of fastening bolts later. At the same time, when the two groups of first limiting protrusions and the second limiting protrusions are slid and installed to the specified positions, the two groups of first limiting protrusions and the second limiting protrusions cooperate with the reinforcement pipe sleeve to complete the auxiliary fixation and limiting between the first docking part and the second docking part. When the medium pressure in the pipeline is too large, or some of the fastening bolts are loose, the first docking part and the second docking part will not easily loosen or shake, thereby further ensuring the tightness of the connection between the first flange and the second flange.

[0018] Furthermore, the reinforcement structure is a second reinforcement structure, which includes a first arc groove and a second arc groove, one side of the inner wall of the first arc groove and the second arc groove are provided with a limiting groove, the top and bottom of the outer wall of the second docking part are provided with a plurality of internal thread grooves, the top and bottom of the outer wall of the second docking part are respectively fixedly connected with a first connecting plate and a second connecting plate, the first connecting plate and the second connecting plate are respectively provided with a plurality of stepped holes corresponding to the internal thread grooves, the first connecting plate and the second connecting plate are both fixedly connected to the second docking part by a plurality of fixing screws, and the inner sides of the first connecting plate and the second connecting plate are respectively fixedly connected with a first limiting column and a second limiting column corresponding to the first arc groove and the second arc groove.

[0019] The cam is then screwed onto the second flange of the second flange and the second flange of the second flange are screwed onto the first flange and the second flange are screwed onto the second flange. The first docking part and the second docking part are installed and fixed, and at the same time, multiple groups of first flange holes and second flange holes are also pre-positioned and accurately aligned, which is more convenient for the subsequent locking and fixing of multiple groups of fastening bolts. After the first limit column and the second limit column are engaged in the corresponding limit groove, the auxiliary fixation and limitation between the first docking part and the second docking part can be completed. When the medium pressure in the pipeline is too high, or some fastening bolts are loose, the first docking part and the second docking part will not easily loosen or shake, thereby further ensuring the tightness of the connection between the first flange and the second flange.

[0020] Furthermore, the first arc groove and the second arc groove are respectively opened at the top and the bottom of the outer wall of the first docking portion, and in the assembled state, the first limiting column and the second limiting column are respectively slidably positioned in the first arc groove and the second arc groove.

[0021] Through the above technical solution, the sliding connection between the first limiting column and the second limiting column and the first arc groove and the second arc groove is facilitated, and the pre-positioning between the first flange and the second flange can be quickly achieved.

[0022] Furthermore, the fastening bolt includes a bolt body, which passes through a corresponding set of first flange holes and second flange holes and is locked and fixed by a fastening nut.

[0023] Through the above technical solution, by locking and fixing the first flange and the second flange using multiple sets of fastening bolts, it is possible to ensure the firmness and stability of the locking and also facilitate quick installation and disassembly.

[0024] The beneficial effects of the present invention are as follows: (1) The present invention designs a docking portion on the inner side of the flange, installs a sealing gasket in the annular sealing groove of the docking portion, and cooperates with an auxiliary reinforcement structure, so that the flange assembly can achieve a better sealing effect and effectively prevent the medium in the pipeline from easily leaking; (2) The present invention designs a reinforcement structure. After the reinforcement structure is installed in place, the pre-positioning and precise hole alignment between multiple groups of first flange holes and second flange holes can be completed simultaneously, so that it is more convenient to lock and fix multiple groups of fastening bolts later, thereby greatly improving the assembly speed and assembly efficiency; (3) The present invention designs a reinforcement structure. After the corresponding limiting protrusion or limiting column slides and engages in the corresponding arc groove, the auxiliary fixation and limiting between the first docking portion and the second docking portion can be quickly completed. When the medium pressure in the pipeline is too large, or when some fastening bolts are loose, the first docking portion and the second docking portion will not easily loosen or shake, thereby further ensuring the tightness of the connection between the first flange and the second flange. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a first viewing angle structural diagram of the first embodiment of the present invention.

[0026] Figure 2 This is a structural diagram from a second viewing angle of the first embodiment of the present invention.

[0027] Figure 3 This is a front view of the first embodiment of the present invention.

[0028] Figure 4 It is a right side view of the first embodiment of the present invention.

[0029] Figure 5 for Figure 4 AA section view.

[0030] Figure 6 This is a structural diagram from the first perspective of the main structure of an embodiment of the present invention.

[0031] Figure 7 This is a structural diagram from a second viewing angle of the main structure of an embodiment of the present invention.

[0032] Figure 8 It is an exploded view of the main structure of Example 1 of the present invention.

[0033] Fig. 9 It is a schematic structural diagram of the sealing ring of the present invention.

[0034] Fig.10 It is a structural schematic diagram of the first reinforcement structure of the present invention.

[0035] Fig.11 This is a first viewing angle structural diagram of the second embodiment of the present invention.

[0036] Fig.12 This is a structural diagram of the second viewing angle of the second embodiment of the present invention.

[0037] Fig.13 This is a front view of the second embodiment of the present invention.

[0038] Fig.14 It is a top view of the second embodiment of the present invention.

[0039] Fig.15 for Fig.14 BB-axis three-dimensional cross-sectional view.

[0040] Fig.16 This is a structural diagram from the first perspective of the main structure of the second embodiment of the present invention.

[0041] Fig.17 This is a structural diagram from a second viewing angle of the main structure of the second embodiment of the present invention.

[0042] Fig.18 It is an exploded view of the main structure of the second embodiment of the present invention.

[0043] Fig.19 It is a structural schematic diagram of the second reinforcement structure of the present invention.

[0044] Fig. 20 for Fig.16 A partial enlarged view of point A in the middle.

[0045] Figure numerals: 1, first flange; 2, second flange; 3, first flange hole; 4, second flange hole; 5, first welding portion; 6, second welding portion; 7, first docking portion; 8, second docking portion; 9, annular sealing groove; 10, sealing gasket; 1001, sealing ring body; 1002, annular sealing protrusion; 11, first reinforcement structure; 1101, first arc groove; 1102, second arc groove; 1103, reinforcement sleeve; 1104, first limiting protrusion; 1105, second limiting protrusion; 1106, first connecting plate; 11 07. Second connecting plate; 1108. Mounting hole; 1109. Limiting sleeve; 1110. Fixing block; 1111. Strip through hole; 12. Second reinforcement structure; 1201. First arc groove; 1202. Second arc groove; 1203. Limiting groove; 1204. Internal thread groove; 1205. First connecting plate; 1206. Second connecting plate; 1207. Step hole; 1208. First limiting column; 1209. Second limiting column; 1210. Fixing screw; 13. Fastening bolt; 1301. Bolt body; 1302. Fastening nut. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0047] Embodiment 1: Figure 1-Figure 10 As shown, an embodiment of the present invention provides a flange assembly for pipe connection, including a first flange 1 and a second flange 2, a plurality of first flange holes 3 and a plurality of second flange holes 4 are respectively opened on the circumferential sides of the first flange 1 and the second flange 2, a first welding portion 5 and a second welding portion 6 are respectively fixedly connected to the outer sides of the first flange 1 and the second flange 2, the first welding portion 5 and the second welding portion 6 are respectively connected to the corresponding pipes by welding, the welding fixation can ensure the firmness and stability of the connection, and the welding method can be selected according to actual needs. Flat welding or butt welding; like Figure 6 As shown, the first flange 1 and the second flange 2 are respectively fixedly connected with the first docking portion 7 and the second docking portion 8 on their inner sides, the first flange 1, the first welding portion 5 and the first docking portion 7 are an integrated structure, and the second flange 2, the second welding portion 6 and the second docking portion 8 are an integrated structure, so that the overall structure is simpler and more convenient for quick assembly; like Figure 8-Figure 9 As shown, an annular sealing groove 9 is respectively provided at the center of the opposite side of the first docking part 7 and the second docking part 8, and a sealing gasket 10 is installed between the two annular sealing grooves 9. The sealing gasket 10 includes a sealing ring body 1001, and annular sealing protrusions 1002 are provided on both sides of the outer wall of the sealing ring body 1001. The sealing gasket 10 can achieve a sealing effect between the first docking part 7 and the second docking part 8; the sealing ring body 1001 and the annular sealing protrusion 1002 are integrally injection-molded by a rubber material, and the annular sealing protrusions 1002 on both sides of the sealing ring body 1001 are respectively engaged in the two annular sealing grooves 9. In the assembled state, the annular sealing protrusions 1002 on both sides of the sealing ring body 1001 are respectively engaged in the two annular sealing grooves 9 by adopting an engaging manner, and the sealing ring body 1001 is clamped by the end faces of the first docking part 7 and the second docking part 8, so that a stable seal between the first docking part 7 and the second docking part 8 can be achieved, thereby ensuring the sealing and sealing quality between the first docking part 7 and the second docking part 8; like Fig.10As shown, a reinforcement structure is arranged outside the first docking portion 7 and the second docking portion 8, and the reinforcement structure is a first reinforcement structure 11, and the first reinforcement structure 11 includes two first arcuate grooves 1101 and two second arcuate grooves 1102. A reinforcement sleeve 1103 is sleeved between the first docking portion 7 and the second docking portion 8. Two first limiting protrusions 1104 and two second limiting protrusions 1105 are fixedly connected to the top and bottom of the inner wall of the reinforcement sleeve 1103, respectively. The first connection plate 1106 and the second connection plate 1107 are fixedly connected to the outer wall of the 1103 on both sides, and a plurality of evenly distributed mounting holes 1108 are opened on the peripheral sides of the first connection plate 1106 and the second connection plate 1107. The peripheral sides of the inner walls of the first connection plate 1106 and the second connection plate 1107 are fixedly connected to a plurality of limit sleeves 1109 that are connected to the mounting holes 1108. The front and rear ends of the outer wall of the reinforcement sleeve 1103 are fixedly connected to the fixing blocks 1110. The center of each block 1110 is provided with a strip-shaped through hole 1111. When connecting, the reinforcing sleeve 1103 is firstly sleeved on the outer wall of the first docking portion 7, and the two first limiting protrusions 1104 are slidably limited in the two first arc-shaped grooves 1101 until the first connecting plate 1106 of the reinforcing sleeve 1103 fits with the first flange 1, and then the sealing gasket 10 is inserted into the reinforcing sleeve 1103, and the annular sealing protrusion 1002 on one side of the sealing gasket 10 is engaged with the first The second butt joint part 8 is then placed in the reinforcing sleeve 1103, and the second limiting protrusion 1105 is similarly slidably limited in the two second arc grooves 1102 until the second connecting plate 1107 of the reinforcing sleeve 1103 fits with the second flange 2. At this time, the positioning and limiting of the reinforcing sleeve 1103 are completed. During the assembly process, the reinforcing sleeve 1103 can be rotated and adjusted by the fixing block 1110, so as to facilitate the operation. like Figure 6-Figure 7As shown, the two first arc grooves 1101 are respectively opened at the top and bottom of the outer wall of the first docking portion 7, and the two second arc grooves 1102 are respectively opened at the top and bottom of the outer wall of the second docking portion 8. In the assembled state, the two first limiting protrusions 1104 are respectively slidably positioned in the two first arc grooves 1101, and the two second limiting protrusions 1105 are respectively slidably positioned in the two second arc grooves 1102. By using the reinforcement sleeve 1103 to be sleeved between the first docking portion 7 and the second docking portion 8, and using two groups of first limiting protrusions 1104 and second limiting protrusions 1105 for sliding guidance and limiting, the installation and positioning of the reinforcement sleeve 1103 can be quickly completed, and multiple groups of first limiting protrusions can also be quickly completed. The pre-positioning and precise alignment of the flange hole 3, the second flange hole 4 and the mounting hole 1108 facilitates the subsequent locking and fixing of multiple sets of fastening bolts 13. At the same time, when the two sets of first limiting protrusions 1104 and the second limiting protrusions 1105 are slidably installed to the specified position, the two sets of first limiting protrusions 1104 and the second limiting protrusions 1105 cooperate with the reinforcement sleeve 1103 to complete the auxiliary fixation and limiting between the first docking part 7 and the second docking part 8. When the medium pressure in the pipeline is too high, or some of the fastening bolts 13 are loose, the first docking part 7 and the second docking part 8 will not easily loosen or shake, thereby further ensuring the tightness of the connection between the first flange 1 and the second flange 2. like Figure 5 As shown, a plurality of sets of fastening bolts 13 are installed between the first flange 1 and the second flange 2. The fastening bolts 13 include a bolt body 1301. The bolt body 1301 passes through a corresponding set of first flange holes 3 and second flange holes 4, and is fastened and fixed by a fastening nut 1302. By fastening and fixing the first flange 1 and the second flange 2 using a plurality of sets of fastening bolts 13, the firmness and stability of the locking can be ensured, and quick installation and disassembly are also facilitated.

[0048] Embodiment 2: Figure 11-Figure 20As shown, this embodiment is based on the first embodiment: the reinforcement structure is a second reinforcement structure 12, the second reinforcement structure 12 includes a first arc groove 1201 and a second arc groove 1202, one side of the inner wall of the first arc groove 1201 and the second arc groove 1202 is provided with a limiting groove 1203, the top and bottom of the outer wall of the second docking portion 8 are provided with a plurality of internal thread grooves 1204, the top and bottom of the outer wall of the second docking portion 8 are respectively fixedly connected with a first connecting plate 1205 and a second connecting plate 1206, and the first connecting plate 1205 and the second connecting plate 1206 are provided with a plurality of internal thread grooves 1204. 204 corresponding to the stepped hole 1207, the first connecting plate 1205 and the second connecting plate 1206 are fixedly connected to the second docking portion 8 by a plurality of fixing screws 1210, and the inner sides of the first connecting plate 1205 and the second connecting plate 1206 are respectively fixedly connected with the first limiting column 1208 and the second limiting column 1209 corresponding to the first arc groove 1201 and the second arc groove 1202. When connecting, the first connecting plate 1205 and the second connecting plate 1206 can be first connected and fixed to the second docking portion 8 by a plurality of fixing screws 1210, and the annular sealing protrusion on one side of the sealing gasket 10 is fixedly connected. The first butt joint 7 and the second butt joint 8 are installed in place, and the sealing gasket 10 is also stably installed and fixed between the first butt joint 7 and the second butt joint 8. At the same time, multiple groups of first flange holes 3 and second flange holes 4 have also completed pre-positioning and precise hole alignment, so that it is more convenient to lock and fix multiple groups of fastening bolts 13 later. After the first limiting column 1208 and the second limiting column 1209 are engaged in the corresponding limiting groove 1203, the auxiliary fixation and limiting between the first docking part 7 and the second docking part 8 can be completed. When the medium pressure in the pipeline is too large, or some of the fastening bolts 13 are loose, the first docking part 7 and the second docking part 8 will not be easily loosened or shaken, thereby further ensuring the tightness of the connection between the first flange 1 and the second flange 2; The first arc groove 1201 and the second arc groove 1202 are respectively opened at the top and the bottom of the outer wall of the first docking part 7, and in the combined state, the first limiting column 1208 and the second limiting column 1209 are respectively slidably positioned in the first arc groove 1201 and the second arc groove 1202, which not only facilitates the sliding connection between the first limiting column 1208 and the second limiting column 1209 and the first arc groove 1201 and the second arc groove 1202, but also can quickly realize the pre-positioning between the first flange 1 and the second flange 2.

[0049] The working principle of this embodiment is as follows: first, the first welding part 5 and the second welding part 6 are respectively connected to the corresponding pipes by welding, and annular sealing grooves 9 are respectively opened in the centers of the opposite sides of the first docking part 7 and the second docking part 8. When the first flange 1 and the second flange 2 are connected, the sealing gasket 10 is first installed and clamped between the two annular sealing grooves 9. A reinforcement structure is arranged on the outer side between the first docking part 7 and the second docking part 8. When the first docking part 7 and the second docking part 8 are docked, the reinforcement structure can be used to complete pre-positioning and limiting. After the reinforcement structure is installed in place, the pre-positioning and precise hole alignment between multiple groups of first flange holes 3 and second flange holes 4 are also completed. Finally, multiple bolt bodies 1301 are passed through each corresponding group of first flange holes 3 and second flange holes 4, and locked and fixed by tightening nuts 1302.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. A flange assembly for connecting pipe fittings, comprising a first flange (1) and a second flange (2), characterized in that: A plurality of first flange holes (3) and a plurality of second flange holes (4) are respectively provided on the circumference of the first flange (1) and the second flange (2); a first welding portion (5) and a second welding portion (6) are respectively fixedly connected to the outer sides of the first flange (1) and the second flange (2); A first butt joint portion (7) and a second butt joint portion (8) are fixedly connected to the inner sides of the first butt joint portion (1) and the second butt joint portion (2), respectively; an annular sealing groove (9) is respectively provided at the center of the first butt joint portion (7) and the second butt joint portion (8) on opposite sides; a sealing gasket (10) is installed between the two annular sealing grooves (9); A reinforcement structure is provided on the outer side between the first docking portion (7) and the second docking portion (8), and a plurality of sets of fastening bolts (13) are installed between the first flange (1) and the second flange (2).

2. The flange assembly for pipe connection according to claim 1, characterized in that: The first flange (1), the first welding portion (5) and the first docking portion (7) are an integrated structure, and the second flange (2), the second welding portion (6) and the second docking portion (8) are an integrated structure.

3. The flange assembly for pipe connection according to claim 2, characterized in that: The first welding portion (5) and the second welding portion (6) are respectively connected to corresponding pipelines by welding.

4. The flange assembly for pipe connection according to claim 1, characterized in that: The sealing gasket (10) comprises a sealing ring body (1001), and annular sealing protrusions (1002) are provided on both sides of the outer wall of the sealing ring body (1001).

5. The flange assembly for pipe connection according to claim 4, characterized in that: The sealing ring body (1001) and the annular sealing protrusion (1002) are integrally injection-molded from a rubber material, and the annular sealing protrusions (1002) on both sides of the sealing ring body (1001) are respectively engaged in two annular sealing grooves (9).

6. The flange assembly for pipe connection according to claim 1, characterized in that: The reinforcement structure is a first reinforcement structure (11), the first reinforcement structure (11) comprising two first arcuate grooves (1101) and two second arcuate grooves (1102), a reinforcement sleeve (1103) is sleeved between the first docking portion (7) and the second docking portion (8), two first limiting protrusions (1104) and two second limiting protrusions (1105) are fixedly connected to the top and bottom sides of the inner wall of the reinforcement sleeve (1103), and first connection plates (1106) are fixedly connected to the outer wall of the reinforcement sleeve (1103) on both sides. and a second connection disk (1107), the first connection disk (1106) and the second connection disk (1107) are provided with a plurality of evenly distributed mounting holes (1108) on their circumferential sides, the inner walls of the first connection disk (1106) and the second connection disk (1107) are fixedly connected with a plurality of limit sleeves (1109) intersecting the mounting holes (1108) on their circumferential sides, the front and rear ends of the outer walls of the reinforcement sleeve (1103) are fixedly connected with fixing blocks (1110), and the centers of the two fixing blocks (1110) are provided with strip-shaped through holes (1111).

7. The flange assembly for pipe connection according to claim 6, characterized in that: The two first arc-shaped grooves (1101) are respectively opened at the top and bottom of the outer wall of the first docking portion (7), and the two second arc-shaped grooves (1102) are respectively opened at the top and bottom of the outer wall of the second docking portion (8). In the assembled state, the two first limiting protrusions (1104) are respectively slidably positioned in the two first arc-shaped grooves (1101), and the two second limiting protrusions (1105) are respectively slidably positioned in the two second arc-shaped grooves (1102).

8. The flange assembly for pipe connection according to claim 1, characterized in that: The reinforcement structure is a second reinforcement structure (12), the second reinforcement structure (12) comprising a first circular arc groove (1201) and a second circular arc groove (1202), one side of the inner wall of the first circular arc groove (1201) and the second circular arc groove (1202) is provided with a limiting groove (1203), the top and bottom of the outer wall of the second docking portion (8) are provided with a plurality of internal thread grooves (1204), the top and bottom of the outer wall of the second docking portion (8) are respectively fixedly connected with a first connecting plate (1205) and a second connecting plate (1206), the first connecting A plurality of stepped holes (1207) corresponding to the internal thread groove (1204) are provided on the plate (1205) and the second connecting plate (1206); the first connecting plate (1205) and the second connecting plate (1206) are fixedly connected to the second docking portion (8) via a plurality of fixing screws (1210); and the first limiting column (1208) and the second limiting column (1209) corresponding to the first circular arc groove (1201) and the second circular arc groove (1202) are fixedly connected to the inner sides of the first connecting plate (1205) and the second connecting plate (1206), respectively.

9. The flange assembly for pipe connection according to claim 8, characterized in that: The first circular arc groove (1201) and the second circular arc groove (1202) are respectively provided at the top and the bottom of the outer wall of the first docking portion (7), and in the assembled state, the first limiting column (1208) and the second limiting column (1209) are respectively slidably positioned in the first circular arc groove (1201) and the second circular arc groove (1202).

10. The flange assembly for pipe connection according to claim 1, characterized in that: The fastening bolt (13) comprises a bolt body (1301), wherein the bolt body (1301) passes through a corresponding set of first flange holes (3) and second flange holes (4), and is locked and fixed by a fastening nut (1302).

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