Concave-convex straight opening type flange device with double semi-circular-ring-shaped grooves and without flow choking

Abstract

The utility model discloses a double-semicircular-ring-shaped groove flow-resistance-free concave-convex straight opening type flange device, which belongs to the technical field of flange connection and comprises an upper flange and a lower flange which are relatively fixed through bolts, and connecting channels are arranged on the upper flange and the lower flange. A concave-convex straight opening type connecting structure is formed between the upper flange and the lower flange through a connecting channel, a sealing assembly is arranged between the upper flange and the lower flange and comprises two semicircular upper grooves, two semicircular lower grooves and a sealing gasket, the two semicircular upper grooves are formed in the upper flange respectively, and the two semicircular lower grooves are formed in the lower flange respectively. The two semicircular upper grooves are formed in the upper flange, the two semicircular lower grooves are formed in the lower flange, the semicircular upper grooves and the semicircular lower grooves are matched to form double-circular-ring-shaped sealing grooves, the sealing gasket is provided with annular sealing protrusions matched with the double-circular-ring-shaped sealing grooves, and the annular sealing protrusions are fixed in the double-circular-ring-shaped sealing grooves. According to the utility model, the problems of large fluid resistance and unstable sealing performance are solved, and the installation difficulty is low.

Description

Technical Field

[0001] The utility model belongs to the technical field of flange connection, and in particular relates to a concave-convex straight-mouth flange device with double semicircular ring grooves and no flow obstruction. Background Art

[0002] At present, when connecting pipelines, flanges are generally welded to the ends of the pipelines. When connecting, a rubber pad is first manually placed between the two flanges, and then the two pipelines are connected with bolts.

[0003] like Figure 5 The socket flange connection structure shown includes a sealing gasket 18 and two flanges 17. A pipe receiving hole 14 is respectively opened in the inner ring hole of the two flanges 17, and the ends of the two connected pipes 1 are respectively inserted into the pipe receiving holes 14 of the two flanges 17; then, a circle of welds are respectively welded on the non-sealing surfaces of the two flanges 1, and the two connected pipes 1 are respectively welded to the two flanges 17; then, the sealing gasket 18 is manually placed between the sealing surfaces of the two flanges 17, and pressure is applied to the two flanges 17 through the combination of bolts and bolt holes 19, so that the sealing gasket 18 is deformed to achieve sealing.

[0004] However, when this connection structure is applied to actual production, the following technical problems often occur:

[0005] 1. Due to the design difference that the bolt hole diameter is larger than the outer diameter of the connecting bolt, the inner ring holes of the two flanges are easily misaligned when the flanges are connected, forming a transition step, thereby increasing the fluid resistance.

[0006] 2. When placing the sealing gasket manually, improper operation or inaccurate positioning may easily cause the sealing gasket to be misaligned with the inner ring hole of the flange, which not only increases the fluid resistance, but may also cause leakage due to the sealing gasket being corroded by the fluid and failing to fully adhere to the sealing surface of the flange.

[0007] Therefore, it is necessary to design a new type of flange connection structure, which can effectively avoid the increase of fluid resistance and ensure a more stable sealing of the flange connection. Utility Model Content

[0008] The purpose of the utility model is to solve the above-mentioned problems existing in the prior art, and to provide a concave-convex straight-mouth flange device with double semi-circular grooves and no flow obstruction, which effectively solves the technical problems in the prior art caused by the misalignment between the inner ring holes and the misalignment between the sealing gasket and the inner ring holes, as well as the unstable sealing of the flange connection.

[0009] In order to achieve the above purpose, the technical solution adopted by the present utility model is as follows:

[0010] The utility model provides a concave-convex straight-mouth flange device with double semi-circular grooves and no flow obstruction, comprising an upper flange and a lower flange fixed relatively to each other by bolts, wherein both the upper flange and the lower flange are provided with connecting channels, and a concave-convex straight-mouth connection structure is formed between the upper flange and the lower flange through the connecting channel;

[0011] A sealing assembly is provided between the upper flange and the lower flange, and the sealing assembly includes two semicircular upper grooves, two semicircular lower grooves and a sealing gasket. The two semicircular upper grooves are respectively provided on the upper flange, and the two semicircular lower grooves are respectively provided on the lower flange. The semicircular upper grooves and the semicircular lower grooves cooperate to form a double circular sealing groove; the sealing gasket is provided with annular sealing protrusions respectively adapted to the double circular sealing grooves, and the annular sealing protrusions are fixed in the double circular sealing grooves.

[0012] Preferably, the end of the connecting channel on the upper flange is provided with an external protrusion, and the end of the connecting channel on the lower flange is provided with an internal support platform adapted to the external protrusion, and a concave-convex straight-mouth connection structure is formed between the upper flange and the lower flange through the external protrusion and the internal support platform.

[0013] Preferably, the connecting channel includes a pipe connecting section and a relative connecting section, the inner diameter of the pipe connecting section is larger than the inner diameter of the relative connecting section, a welding base for welding with the pipe is provided between the pipe connecting section and the relative connecting section, and welding bosses for welding with the pipe are provided around the end of the pipe connecting section.

[0014] The utility model also provides another double semi-circular groove non-obstructive concave-convex straight flange device, comprising an upper flange and a lower flange fixed relatively to each other by bolts, wherein the upper flange and the lower flange are both provided with connecting channels, and a sealing assembly is provided between the upper flange and the lower flange;

[0015] The sealing assembly includes an upper sealing sleeve, a lower sealing sleeve, two semicircular upper grooves, two semicircular lower grooves and a sealing gasket. The upper sealing sleeve and the lower sealing sleeve are clamped and fixed between the upper flange and the lower flange; the two semicircular upper grooves are respectively provided on the upper sealing sleeve, and the two semicircular lower grooves are respectively provided on the lower sealing sleeve, and the semicircular upper grooves and the semicircular lower grooves cooperate to form a double circular sealing groove;

[0016] The sealing gasket is provided with annular sealing protrusions respectively adapted to the double annular sealing grooves, and the annular sealing protrusions are fixed in the double annular sealing grooves; the upper sealing sleeve and the lower sealing sleeve both have axial channels communicating with the connecting channel, the axial channel includes a pipe connecting section and a relative connecting section, the inner diameter of the pipe connecting section is the same as the inner diameter of the connecting channel, the inner diameter of the relative connecting section is smaller than the inner diameter of the pipe connecting section, and a concave-convex straight-mouth connection structure is formed between the upper flange and the lower flange through the axial channel.

[0017] Preferably, the end of the axial channel on the upper sealing sleeve is provided with an external protrusion, and the end of the axial channel on the lower sealing sleeve is provided with an internal support platform adapted to the external protrusion, and a concave-convex straight-mouth connection structure is formed between the upper flange and the lower flange through the external protrusion and the internal support platform.

[0018] Preferably, a welding platform for welding to the pipeline is provided between the pipeline connecting section and the relative connecting section, and welding bosses for welding to the pipeline are provided around the end of the pipeline connecting section.

[0019] Preferably, the ends of the connecting channels of the upper flange and the lower flange are both provided with conical notches, and the shapes of the conical notches and the welding bosses are adapted to each other. When the upper flange and the lower flange are fixed by bolts, the welding bosses of the upper sealing sleeve and the lower sealing sleeve are respectively nested in the conical notches of the upper flange and the lower flange.

[0020] The advantages of adopting the utility model are:

[0021] 1. In the present invention, firstly, a double annular sealing groove is formed by cooperating between the two semicircular upper grooves of the upper flange and the two semicircular lower grooves of the lower flange. The annular sealing protrusion is fixed in the double annular sealing groove and closely cooperates with the double annular sealing groove to form a double-layer seal, which significantly improves the stability of the flange connection sealing performance and eliminates the flow obstruction caused by the misalignment between the sealing gasket and the inner ring hole in the prior art, thereby greatly improving the fluid flow efficiency and sealing durability of the flange connection structure.

[0022] Secondly, the double-layer sealing structure with a ring-shaped sealing protrusion and a double-circular sealing groove tightly fitted together reduces the operational difficulty during the installation of the sealing gasket, simplifies the installation process, and improves construction efficiency.

[0023] Finally, a concave-convex straight-mouth connection structure is formed between the upper flange and the lower flange through a connecting channel, ensuring that the fluid can pass through without resistance or obstruction.

[0024] In summary, the utility model effectively solves the technical problems in the prior art of increased fluid resistance and unstable flange connection sealing caused by misalignment between inner ring holes and between sealing gaskets and inner ring holes.

[0025] 2. In the present invention, a concave-convex straight-mouth connection structure is formed between the upper flange and the lower flange through the external protrusion and the internal support platform, which ensures that the sealing surfaces of the upper flange and the lower flange can be fully aligned when connected, and are connected coaxially and with the same diameter, with almost no gap, further improving the fluid flow efficiency.

[0026] 3. In the present invention, the inner diameter of the pipe connecting section in the connecting channel is designed to be larger than the inner diameter of the relative connecting section, so as to reserve space for the thickness of the pipe wall of the connected pipe, thereby ensuring that the inner diameter of the relative connecting section is as consistent as possible with the inner diameter of the connected pipe, thereby improving the fluid circulation efficiency; in addition, the present invention ensures the stability and reliability of the connection between the connected pipe and the upper flange and the lower flange through the design of the welding base and the welding boss.

[0027] 4. In another concave-convex straight-mouth flange device with double semi-circular grooves and no flow obstruction of the utility model, first, the two semi-circular upper grooves of the upper sealing sleeve and the two semi-circular lower grooves of the lower sealing sleeve cooperate to form a double-circular sealing groove, and the annular sealing protrusion is fixed in the double-circular sealing groove and closely cooperates with the double-circular sealing groove to form a double-layer seal, which not only ensures the stability of the sealing ability, but also eliminates the flow obstruction caused by the misalignment of the sealing gasket and the inner ring hole between the sealing sleeves in the prior art, greatly improving the fluid flow efficiency and sealing durability of the flange device.

[0028] Secondly, the double-layer sealing structure with a ring-shaped sealing protrusion and a double-circular sealing groove tightly fitted together reduces the operational difficulty during the installation of the sealing gasket, simplifies the installation process, and improves construction efficiency.

[0029] Third, the upper flange and the lower flange form a concave-convex straight-mouth connection structure through the axial channel, which ensures that the fluid can pass through without resistance or obstruction.

[0030] Finally, by designing that the inner diameter of the pipe connecting section is the same as the inner diameter of the connecting channel, and the inner diameter of the relative connecting section is smaller than the inner diameter of the pipe connecting section, space is reserved for the thickness of the wall of the connected pipe, ensuring that when the end of the connected pipe is inserted into the pipe connecting section and connected, its inner diameter is consistent with the inner diameter of the axial channel, thereby effectively avoiding increasing the flow resistance of the fluid and ultimately achieving a state of no resistance and no obstruction when the fluid passes through.

[0031] 5. In another double semi-circular ring groove non-obstructive concave-convex straight-mouth flange device of the present invention, the design of the welding base and the welding boss ensures the stability of the connection between the connected pipe and the upper sealing sleeve and the lower sealing sleeve respectively.

[0032] 6. In another double semi-circular ring groove non-obstructive concave-convex straight-mouth flange device of the present invention, conical notches are set at the ends of the connecting channels of the upper flange and the lower flange, and the shapes of the conical notches and the welding bosses are adapted. When the upper flange and the lower flange are fixed by bolts, the welding bosses of the upper sealing sleeve and the lower sealing sleeve are respectively nested in the conical notches of the upper flange and the lower flange, ensuring the precise positioning of the upper sealing sleeve and the lower sealing sleeve during sealing installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the split structure in Example 1 of the present utility model;

[0034] Figure 2 This is a schematic diagram of the connection structure in Example 1 of the present utility model;

[0035] Figure 3 This is a schematic diagram of the split structure in Example 2 of the present utility model;

[0036] Figure 4 This is a schematic diagram of the connection structure in Example 2 of the present utility model;

[0037] Figure 5 It is a schematic diagram of the socket flange connection structure in the prior art.

[0038] The numbers in the figure are: 1. pipeline, 2. upper flange, 3. lower flange, 4. bolt connection hole, 5. connection channel, 50. pipeline connection section, 51. relative connection section, 52. welding base, 53. outer protrusion, 54. inner base, 6. sealing assembly, 7. semicircular upper groove, 8. semicircular lower groove, 9. sealing gasket, 90. annular sealing protrusion, 10. upper sealing sleeve, 11. lower sealing sleeve, 12. axial channel, 13. conical notch, 14. pipe bearing hole, 15. welding boss, 16. double annular sealing groove, 17. flange, 18. sealing gasket, 19. bolt hole. DETAILED DESCRIPTION

[0039] To make the purpose, technical solution, and advantages of the embodiments of the present invention more clear, the technical solution of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. For ease of description, the nomenclature of "upper" and "lower" in each component is determined according to the layout of the drawings in the specification, such as "upper flange", "lower flange", etc., which are named and described according to the layout direction of the drawings in the specification; the description of the relative positional relationship of each component is also described according to the layout of the drawings in the specification, such as: the positional relationship of front, back, up, down, left, right, etc. is determined according to the layout direction of the drawings in the specification.

[0040] Example 1

[0041] In this embodiment, Figure 1-2 As shown, a double semi-circular groove non-obstructive concave-convex straight-mouth flange device includes an upper flange 2 and a lower flange 3 relatively fixed by bolts, and a connecting channel 5 is provided on both the upper flange 2 and the lower flange 3. The two connecting channels 5 are connected and coaxially and radially arranged, and a concave-convex straight-mouth connection structure is formed between the upper flange 2 and the lower flange 3 through the connecting channel 5.

[0042] like Figure 1As shown, a sealing assembly 6 is provided between the upper flange 2 and the lower flange 3 for sealing the connection between the upper flange 2 and the lower flange 3. The sealing assembly 6 includes two semicircular upper grooves 7, two semicircular lower grooves 8 and a sealing gasket 9. The two semicircular upper grooves 7 are respectively provided on the upper flange 2, and the two semicircular lower grooves 8 are respectively provided on the lower flange 3. The semicircular upper grooves 7 and the semicircular lower grooves 8 cooperate to form a double annular sealing groove 16. Specifically, Figure 1 Taking the direction shown as an example, with the axial centerline of the flange device regarded as the inner side, the two semicircular upper grooves 7 on the sealing surface of the upper flange 2 are respectively the inner ring upper groove located on the inner side and the outer ring upper groove located on the outer side, and both of these upper grooves are coaxially arranged with the connecting channel 5 of the upper flange 2; correspondingly, the two semicircular lower grooves 8 on the sealing surface of the lower flange 3 are respectively the inner ring lower groove located on the inner side and the outer ring lower groove located on the outer side, and both of these lower grooves are coaxially arranged with the connecting channel 5 of the lower flange 3.

[0043] Continue to refer Figure 1 The sealing gasket 9 is further provided with an annular sealing protrusion 90 respectively adapted to the double annular sealing groove 16 , and the annular sealing protrusion 90 is fixed in the double annular sealing groove 16 .

[0044] The annular sealing protrusion 90 includes sealing ring protrusions respectively arranged on the upper end surface and the lower end surface of the sealing gasket 9. The number of sealing ring protrusions on the upper end surface and the lower end surface are two and are coaxially arranged. The two sealing ring protrusions on the upper end surface are adapted to the two semicircular annular upper grooves 7 (that is, adapted to the inner ring upper groove and the outer ring upper groove on the sealing surface of the upper flange 2), and the two sealing ring protrusions on the lower end surface are adapted to the two semicircular annular lower grooves 8 (that is, adapted to the inner ring upper groove and the outer ring upper groove on the sealing surface of the lower flange 3).

[0045] In this embodiment, the two semicircular upper grooves 7 of the upper flange 2 and the two semicircular lower grooves 8 of the lower flange 3 cooperate to form a double-circular sealing groove 16, and the annular sealing protrusion 90 is fixed in the double-circular sealing groove 16 and closely cooperates with the double-circular sealing groove 16 to form a double-layer seal. While ensuring the stability of the sealing, it also eliminates the flow obstruction phenomenon caused by the misalignment of the sealing gasket and the inner ring hole in the prior art.

[0046] Furthermore, an external protrusion 53 is provided at the end of the connecting channel 5 on the upper flange 2, and an internal support 54 is provided at the end of the connecting channel 5 on the lower flange 3, which matches the external protrusion 53. The external protrusion 53 and the internal support 54 form a concave-convex straight-mouth connection structure between the upper flange 2 and the lower flange 3. This design ensures that the sealing surfaces of the upper flange 2 and the lower flange 3 are fully aligned during connection, forming a coaxial and codiametric connection with almost no gap, ensuring that fluid can flow through the concave-convex straight-mouth connection structure without resistance or obstruction.

[0047] The connecting channel 5 includes a pipe connecting section 50 and a relative connecting section 51. Figure 1 Taking the direction shown as an example, the connecting channel 5 on the upper flange 2 includes a pipe connecting section 50 at the upper end and an opposing connecting section 51 at the lower end, and the connecting channel 5 on the lower flange 3 includes a pipe connecting section 50 at the lower end and an opposing connecting section 51 at the upper end. The inner diameter of the pipe connecting section 50 is designed to be larger than the inner diameter of the opposing connecting section 51 to reserve space occupied by the wall thickness of the connected pipe 1, thereby ensuring that the inner diameter of the opposing connecting section 51 is as consistent as possible with the inner diameter of the connected pipe 1. When the fluid passes through the connection structure of this embodiment, whether it enters the opposing connecting section from the connected pipe 1 or enters the connected pipe 1 from the opposing connecting section, its flow path remains continuous and the diameter is consistent, thereby minimizing fluid resistance and further improving fluid circulation efficiency.

[0048] A welding pedestal 52 for welding to the pipe 1 is provided between the pipe connecting section 50 and the opposing connecting section 51. Welding bosses 15 are provided around the ends of the pipe connecting section 50 for welding to the pipe 1. Specifically, the pipe connecting section 50 is welded to the end of the connected pipe 1 via the welding pedestal 52. Simultaneously, the upper flange 2 and the outer wall of the connected pipe 1, as well as the lower flange 3 and the outer wall of the connected pipe 1, are welded via the welding bosses 15.

[0049] In addition, a plurality of axial bolt connection holes 4 are provided on the upper flange 2 and the lower flange 3 . The bolt connection holes 4 are located radially outside the connecting channel 5 and the sealing assembly 6 and are used for bolt connection between the upper flange 2 and the lower flange 3 .

[0050] Example 2

[0051] In order to enrich the application scenarios of the present invention, based on the design concept of Example 1, another concave-convex straight-mouth flange device with double semi-circular grooves and no flow obstruction is designed in this embodiment.

[0052] like Figure 3-4 As shown, in this embodiment, a double semi-circular groove non-obstructive concave-convex straight-mouth flange device includes an upper flange 2 and a lower flange 3 relatively fixed by bolts, and a connecting channel 5 is provided on the upper flange 2 and the lower flange 3. The two connecting channels 5 are coaxially and diametrically arranged. The upper flange 2 and the lower flange 3 are respectively movably connected to the connected pipe 1 through the connecting channels 5. Therefore, this embodiment as a whole belongs to a slip-on flange connection structure.

[0053] A plurality of axial bolt connection holes 4 are provided on both the upper flange 2 and the lower flange 3 . The bolt connection holes 4 are located radially outside the connecting channel 5 and the sealing assembly 6 and are used for bolt connection between the upper flange 2 and the lower flange 3 .

[0054] Continue to refer Figure 3 A sealing assembly 6 is also provided between the upper flange 2 and the lower flange 3. The sealing assembly 6 includes an upper sealing sleeve 10, a lower sealing sleeve 11, two semicircular upper grooves 7, two semicircular lower grooves 8 and a sealing gasket 9. The upper sealing sleeve 10 and the lower sealing sleeve 11 are clamped and fixed between the upper flange 2 and the lower flange 3; the two semicircular upper grooves 7 are respectively provided on the upper sealing sleeve 10, and the two semicircular lower grooves 8 are respectively provided on the lower sealing sleeve 11. The semicircular upper grooves 7 and the semicircular lower grooves 8 cooperate to form a double annular sealing groove 16. Specifically, Figure 3 Taking the direction shown as an example, with the axis of the flange device regarded as the inner side, the two semi-circular upper grooves 7 on the sealing surface of the upper sealing sleeve 10 are respectively the inner ring upper groove located on the inner side and the outer ring upper groove located on the outer side, and both of these upper grooves are coaxially arranged with the connecting channel 5 of the upper flange 2; correspondingly, the two semi-circular lower grooves 8 on the sealing surface of the lower sealing sleeve 11 are respectively the inner ring lower groove located on the inner side and the outer ring lower groove located on the outer side, and both of these lower grooves are coaxially arranged with the connecting channel 5 of the lower flange 3.

[0055] The sealing gasket 9 is provided with annular sealing protrusions 90 that respectively match the double annular sealing grooves 16. The annular sealing protrusions 90 are fixed in the double annular sealing grooves 16. The annular sealing protrusions 90 include sealing ring protrusions respectively provided on the upper end face and the lower end face of the sealing gasket 9. There are two sealing ring protrusions on the upper end face and the lower end face, and they are coaxially arranged. The two sealing ring protrusions on the upper end face match the two semi-circular upper grooves 7 (that is, the inner ring upper groove and the outer ring upper groove on the sealing surface of the upper sealing sleeve 10), and the two sealing ring protrusions on the lower end face match the two semi-circular lower grooves 8 (that is, the inner ring upper groove and the outer ring upper groove on the sealing surface of the lower sealing sleeve 11).

[0056] In this embodiment, the two semicircular upper grooves 7 of the upper sealing sleeve 10 and the two semicircular lower grooves 8 of the lower sealing sleeve 11 cooperate to form a double-circular sealing groove 16, and the annular sealing protrusion 90 is fixed in the double-circular sealing groove 16 and closely cooperates with the double-circular sealing groove 16 to form a double-layer seal. While ensuring the sealing stability, it also eliminates the flow obstruction phenomenon caused by the misalignment of the sealing gaskets between the sealing sleeves in the prior art.

[0057] Both the upper sealing sleeve 10 and the lower sealing sleeve 11 have an axial channel 12 communicating with the connecting channel 5, and the axial channel 12 is also communicated with the connected pipe 1, that is, the axial channel 12 of the upper sealing sleeve 10 is communicated with the connected pipe 1, the axial channel 12 of the lower sealing sleeve 11 is communicated with the connected pipe 1, and the axial channel 12 of the upper sealing sleeve 10 is communicated with the axial channel 12 of the lower sealing sleeve 11.

[0058] The axial channel 12 includes a pipe connecting section 50 and a relative connecting section 51. Figure 3 Taking the direction shown as an example, the axial channel 12 on the upper sealing sleeve 10 includes a pipe connecting section 50 at the upper end and a relative connecting section 51 at the lower end, and the axial channel 12 on the lower sealing sleeve 11 includes a pipe connecting section 50 at the lower end and a relative connecting section 51 at the upper end.

[0059] In order to reserve space for the wall thickness of the connected pipe 1 and ensure that after the end of the connected pipe 1 is inserted into the pipe connecting section 50 for connection, the inner diameter of the connected pipe 1 is consistent with the inner diameter of the axial channel 12, the inner diameter of the pipe connecting section 50 is designed to be the same as the inner diameter of the connecting channel 5, and the inner diameter of the relative connecting section 51 is smaller than the inner diameter of the pipe connecting section 50; the upper flange 2 and the lower flange 3 form a concave-convex straight-mouth connection structure through the axial channel 12.

[0060] Furthermore, an outer protrusion 53 is provided at the end of the axial channel 12 on the upper sealing sleeve 10, and an inner support 54 is provided at the end of the axial channel 12 on the lower sealing sleeve 11, which is adapted to the outer protrusion 53. The outer protrusion 53 and the inner support 54 form a concave-convex straight-mouth connection structure between the upper flange 2 and the lower flange 3. This design ensures that the sealing surfaces of the upper sealing sleeve 10 and the lower sealing sleeve 11 can be fully aligned when connected, and are connected coaxially and with the same diameter, with almost no gap, ensuring that the fluid can pass through the concave-convex straight-mouth connection structure without resistance or obstruction. At the same time, the double-layer sealing structure in which the annular sealing protrusion 90 is tightly matched with the double-annular sealing groove 16, as well as the coordination of the concave-convex straight-mouth connection structure, simplifies the installation process, reduces the difficulty of operation for workers, and improves construction efficiency.

[0061] A welding platform 52 for welding to the pipe 1 is provided between the pipe connecting section 50 and the opposing connecting section 51. Welding bosses 15 for welding to the pipe are provided around the ends of the pipe connecting section 50. In this embodiment, the structural design of the welding bosses 15 and welding platforms 52 enhances the stability of the flange connection structure when matched to the connected pipe 1.

[0062] In addition, the ends of the connecting passages 5 of the upper flange 2 and the lower flange 3 are both provided with tapered notches 13. The shapes of the tapered notches 13 and the welding bosses 15 match. When the upper and lower flanges 2 and 3 are secured by bolts, the welding bosses 15 of the upper and lower sealing sleeves 10 and 11 respectively nest within the tapered notches 13 of the upper and lower flanges 2 and 3 , respectively. It should be noted that there is no fixed connection between the upper sealing sleeve 10 and the upper flange 2, nor between the lower sealing sleeve 11 and the lower flange 3. The design of the tapered notches 13 and the welding bosses 15 facilitate precise positioning of the upper and lower sealing sleeves 10 and 11 during sealing installation.

[0063] Finally, it should be noted that the flexibility of the present invention allows for a variety of combinations and modifications. For example, the upper flange 2 of Example 1 can be combined with the lower sealing sleeve 11 and lower flange 3 of Example 2 to form another non-restrictive concave-convex straight-mouth flange device with double semicircular annular grooves. This combination still adheres to the design principles of Examples 1 and 2 and will not be further elaborated here.

[0064] The above description is only a specific embodiment of the present invention. Any feature disclosed in this specification, unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes; all disclosed features, or all steps in the methods or processes, except for mutually exclusive features and / or steps, can be combined in any way.

Claims

1. A double semi-circular groove non-blocking concave-convex straight flange device, comprising an upper flange (2) and a lower flange (3) fixed relatively to each other by bolts, characterized in that: The upper flange (2) and the lower flange (3) are both provided with a connecting channel (5), and a concave-convex straight-mouth connection structure is formed between the upper flange (2) and the lower flange (3) via the connecting channel (5); A sealing assembly (6) is provided between the upper flange (2) and the lower flange (3), and the sealing assembly (6) comprises two semicircular upper grooves (7), two semicircular lower grooves (8) and a sealing gasket (9). The two semicircular upper grooves (7) are respectively provided on the upper flange (2), and the two semicircular lower grooves (8) are respectively provided on the lower flange (3). The semicircular upper grooves (7) and the semicircular lower grooves (8) cooperate to form a double circular sealing groove (16); the sealing gasket (9) is provided with an annular sealing protrusion (90) respectively adapted to the double circular sealing groove (16), and the annular sealing protrusion (90) is fixed in the double circular sealing groove (16).

2. The double semi-circular ring groove non-obstructive concave-convex straight-mouth flange device according to claim 1, characterized in that: An outer protrusion (53) is provided at the end of the connecting channel (5) on the upper flange (2), and an inner support platform (54) adapted to the outer protrusion (53) is provided at the end of the connecting channel (5) on the lower flange (3). A concave-convex straight-mouth connection structure is formed between the upper flange (2) and the lower flange (3) via the outer protrusion (53) and the inner support platform (54).

3. The double semi-circular ring groove non-obstructive concave-convex straight-mouth flange device according to claim 2, characterized in that: The connecting channel (5) comprises a pipe connecting section (50) and a relative connecting section (51); the inner diameter of the pipe connecting section (50) is larger than the inner diameter of the relative connecting section (51); a welding platform (52) for welding to the pipe is provided between the pipe connecting section (50) and the relative connecting section (51); and welding bosses (15) for welding to the pipe are provided around the end of the pipe connecting section (50).

4. A double semi-circular groove non-blocking concave-convex straight flange device, comprising an upper flange (2) and a lower flange (3) fixed relatively to each other by bolts, characterized in that: The upper flange (2) and the lower flange (3) are both provided with a connecting channel (5), and a sealing component (6) is provided between the upper flange (2) and the lower flange (3); The sealing assembly (6) comprises an upper sealing sleeve (10), a lower sealing sleeve (11), two semicircular upper grooves (7), two semicircular lower grooves (8) and a sealing gasket (9), wherein the upper sealing sleeve (10) and the lower sealing sleeve (11) are clamped and fixed between the upper flange (2) and the lower flange (3); the two semicircular upper grooves (7) are respectively provided on the upper sealing sleeve (10), and the two semicircular lower grooves (8) are respectively provided on the lower sealing sleeve (11), and the semicircular upper grooves (7) and the semicircular lower grooves (8) cooperate to form a double circular sealing groove (16); the sealing gasket (9) is provided with an annular sealing protrusion (90) respectively adapted to the double circular sealing groove (16), and the annular sealing protrusion (90) is fixed in the double circular sealing groove (16); The upper sealing sleeve (10) and the lower sealing sleeve (11) both have an axial channel (12) communicating with the connecting channel (5). The axial channel (12) includes a pipe connecting section (50) and a relative connecting section (51). The inner diameter of the pipe connecting section (50) is the same as the inner diameter of the connecting channel (5), and the inner diameter of the relative connecting section (51) is smaller than the inner diameter of the pipe connecting section (50). A concave-convex straight-mouth connection structure is formed between the upper flange (2) and the lower flange (3) via the axial channel (12).

5. The double semi-circular ring groove non-obstructive concave-convex straight-mouth flange device according to claim 4, characterized in that: An outer protrusion (53) is provided at the end of the axial channel (12) on the upper sealing sleeve (10), and an inner support platform (54) adapted to the outer protrusion (53) is provided at the end of the axial channel (12) on the lower sealing sleeve (11). A concave-convex straight-mouth connection structure is formed between the upper flange (2) and the lower flange (3) via the outer protrusion (53) and the inner support platform (54).

6. The double semi-circular ring groove non-obstructive concave-convex straight-mouth flange device according to claim 5, characterized in that: A welding platform (52) for welding to the pipeline is provided between the pipeline connecting section (50) and the relative connecting section (51), and welding bosses (15) for welding to the pipeline are provided around the end of the pipeline connecting section (50).

7. The double semi-circular ring groove non-obstructive concave-convex straight-mouth flange device according to claim 6, characterized in that: The ends of the connecting channel (5) of the upper flange (2) and the connecting channel (5) of the lower flange (3) are both provided with a conical notch (13), and the shapes of the conical notch (13) and the welding boss (15) are adapted to each other. When the upper flange (2) and the lower flange (3) are fixed by bolts, the welding bosses (15) of the upper sealing sleeve (10) and the lower sealing sleeve (11) are respectively nested in the conical notches (13) of the upper flange (2) and the lower flange (3).

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