Flange structure

Abstract

The utility model relates to the technical field of flanges, and discloses a flange structure which comprises a first flange, a second flange and a guiding piece, and the first flange is provided with a first positioning hole and a first fixing hole; the second flange and the first flange are oppositely arranged, the second flange is provided with a second positioning hole and a second fixing hole, the second positioning hole and the first positioning hole are oppositely arranged, and the second fixing hole and the first fixing hole are oppositely arranged; and one end of the guide piece is detachably inserted into the first positioning hole, and the other end of the guide piece is suitable for being inserted into the second positioning hole, so that the first fixing hole of the first flange and the second fixing hole of the second flange can be quickly aligned.

Description

Technical Field

[0001] The utility model relates to the technical field of flanges, in particular to a flange structure. Background Art

[0002] A flange is a connecting structure used to connect the ends of two pipes. Flanges are usually fixed together by multiple bolts. During installation, multiple fixing holes between flanges need to be aligned so that bolts can be inserted for fixing. Currently, it is difficult to align the fixing holes between flanges. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a flange structure, in which a first fixing hole of a first flange and a second fixing hole of a second flange can be quickly aligned.

[0004] According to the flange structure provided in the embodiment of the utility model, the flange structure includes a first flange, a second flange and a guide member, the first flange is provided with a first positioning hole and a first fixing hole; the second flange and the first flange are arranged opposite to each other, the second flange is provided with a second positioning hole and a second fixing hole, the second positioning hole and the first positioning hole are arranged opposite to each other, and the second fixing hole and the first fixing hole are arranged opposite to each other; one end of the guide member is detachably plugged into the first positioning hole, and the other end is suitable for being inserted into the second positioning hole.

[0005] According to the flange structure of the embodiment of the utility model, at least the following beneficial effects are achieved: the first flange is provided with a first positioning hole and a first fixing hole, the second flange is provided with a second positioning hole and a second fixing hole, the second positioning hole and the first positioning hole are arranged relative to each other, the second fixing hole and the first fixing hole are arranged relative to each other, one end of the guide member is detachably plugged into the first positioning hole, and the other end is suitable for being plugged into the second positioning hole, so that the guide member can play a guiding and positioning role, so that the first fixing hole of the first flange and the second fixing hole of the second flange can be quickly aligned, so that the fixing structure can be installed in the first fixing hole and the second fixing hole, which helps to quickly connect and fix the second flange to the first flange. In addition, since the guide member is a detachable structure, the first flange and the second flange only need to process the hole structure for installing the guide member to install the guide member, which helps to reduce the manufacturing difficulty of the first flange and the second flange.

[0006] According to some embodiments of the utility model, the guide member includes a threaded section and a connecting section connected to each other, the first positioning hole is a threaded hole, the threaded section is inserted into the first positioning hole, and the connecting section is suitable for being inserted into the second positioning hole.

[0007] According to some embodiments of the utility model, the shape of the connecting section is adapted to the shape of the second positioning hole; the outer circumferential surface of the connecting section includes a first arc surface and a first plane, and the inner circumferential surface of the second positioning hole includes a second arc surface and a second plane; when the connecting section is inserted into the second positioning hole, the first plane and the second plane are opposite, and the first arc surface and the second arc surface are opposite.

[0008] According to some embodiments of the utility model, the shape of the connecting section is adapted to the shape of the second positioning hole; the outer circumferential surface of the connecting section includes a third plane and a fourth plane, and the inner circumferential surface of the second positioning hole includes a fifth plane and a sixth plane. When the connecting section is inserted into the second positioning hole, the third plane and the fifth plane are opposite, and the fourth plane and the sixth plane are opposite.

[0009] According to some embodiments of the present invention, the diameter of the connecting section is greater than the diameter of the threaded section.

[0010] According to some embodiments of the utility model, the first flange is provided with two first positioning holes, the second flange is provided with two second positioning holes, and the flange structure includes two guide members, one end of each guide member is detachably plugged into a first positioning hole, and the other end is suitable for being inserted into an opposite second positioning hole.

[0011] According to some embodiments of the present invention, the two first positioning holes are symmetrically distributed, and the two second positioning holes are symmetrically distributed.

[0012] According to some embodiments of the utility model, the flange structure also includes a first sealing ring; a first annular groove is recessed on the surface of the first flange facing the second flange, and the first sealing ring is arranged in the first annular groove; or, a second annular groove is recessed on the surface of the second flange facing the first flange, and the first sealing ring is arranged in the second annular groove; wherein, when the second flange is connected to the first flange, the first sealing ring abuts between the first flange and the second flange.

[0013] According to some embodiments of the utility model, the flange structure also includes a second sealing ring; a third annular groove is recessed on the surface of the first flange facing the second flange, and the second sealing ring is arranged in the third annular groove; or, a fourth annular groove is recessed on the surface of the second flange facing the first flange, and the second sealing ring is arranged in the fourth annular groove; wherein, when the second flange is connected to the first flange, the second sealing ring abuts between the first flange and the second flange, and the second sealing ring and the first sealing ring are arranged at intervals.

[0014] According to some embodiments of the utility model, the flange structure also includes a fixing member; the first fixing hole is a threaded hole, and the second fixing hole is a countersunk hole; the fixing member is a bolt, the bolt head of the bolt is located in the countersunk hole, and the screw rod of the bolt is inserted into the threaded hole.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0017] Figure 1 A schematic cross-sectional view of the flange structure provided by an embodiment of the utility model is shown.

[0018] Figure 2 Shows Figure 1 Schematic diagram of the cutaway exploded structure of the middle flange structure.

[0019] Reference numerals:

[0020] Flange structure 100;

[0021] First flange 110; first positioning hole 111; first fixing hole 112; first annular groove 113;

[0022] Second flange 120; second positioning hole 121; second fixing hole 122;

[0023] Guide member 130; threaded section 131; connecting section 132;

[0024] Fixing member 140; bolt head 141; screw rod 142;

[0025] The first sealing ring 150 . DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0027] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] In the description of the present utility model, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0029] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0030] In the description of the utility model, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0031] See also Figure 1 to Figure 2 An embodiment of the present application provides a flange structure 100, which can be connected between the pipe ends of two pipes to connect the two pipes, or the flange structure 100 can also be used at the inlet or outlet of the equipment to connect two devices, or the flange structure 100 can also be applied to other scenarios that require connection.

[0032] The flange structure 100 includes a first flange 110 , a second flange 120 and a guide member 130 .

[0033] The first flange 110 may be provided with a first pipe, a first channel penetrating the first flange 110 may be provided in the first pipe, and the first pipe may be used to connect an external pipe. Correspondingly, the second flange 120 may be provided with a second pipe, a second channel penetrating the second flange 120 may be provided in the second pipe, and the second pipe may also be used to connect an external pipe.

[0034] The second flange 120 and the first flange 110 are arranged opposite to each other. Specifically, the first flange 110 and the second flange 120 may be arranged symmetrically.

[0035] The first flange 110 is provided with a first positioning hole 111 and a first fixing hole 112 , and the second flange 120 is provided with a second positioning hole 121 and a second fixing hole 122 . The second positioning hole 121 and the first positioning hole 111 are arranged opposite to each other, and the second fixing hole 122 and the first fixing hole 112 are arranged opposite to each other.

[0036] That is, when the first flange 110 and the second flange 120 are connected, the axes of the first positioning hole 111 and the second positioning hole 121 are collinear, the first positioning hole 111 and the second positioning hole 121 are opposite and connected. The axes of the first fixing hole 112 and the second fixing hole 122 are collinear, the first fixing hole 112 and the second fixing hole 122 are opposite and connected.

[0037] One end of the guide member 130 is detachably plugged into the first positioning hole 111, and the other end is suitable for being inserted into the second positioning hole 121. In this way, the guide member 130 can play a guiding and positioning role, so that the first fixing hole 112 of the first flange 110 and the second fixing hole 122 of the second flange 120 can be quickly aligned, so that the fixing structure can be installed in the first fixing hole 112 and the second fixing hole 122, which helps to quickly connect and fix the second flange 120 and the first flange 110. In addition, since the guide member 130 is a detachable structure, the first flange 110 and the second flange 120 only need to process the hole structure for installing the guide member 130 to install the guide member 130, which helps to reduce the manufacturing difficulty of the first flange 110 and the second flange 120.

[0038] Specifically, when installing the flange structure 100, the guide member 130 can be first inserted into the first positioning hole 111 of the first flange 110, and then the first flange 110 is connected to the pipe to be connected, and then the second positioning hole 121 of the second flange 120 is aligned with the guide member 130. The guide member 130 can guide and position the second flange 120, so that the first fixing hole 112 and the second fixing hole 122 can be quickly aligned, which is convenient for the staff to insert the fixing structure in the first fixing hole 112 and the second fixing hole 122, and helps to more quickly connect and fix the second flange 120 and the first flange 110. For some narrow spaces or scenes where the pipeline needs to be installed vertically, the staff only needs to align the second positioning hole 121 with the guide member 130, and the first fixing hole 112 and the second fixing hole 122 can be quickly and conveniently aligned, and the first flange 110 and the second flange 120 can be fixed by quickly installing the fixing structure, which reduces the time for the staff to lift the second flange 120, making the installation of the flange structure 100 more convenient and fast, and providing convenience for the staff.

[0039] In some embodiments, the flange structure 100 may be a vacuum flange structure 100 , that is, the flange structure 100 may be used as a pipeline for transmitting gas.

[0040] In some embodiments, the first positioning hole 111 can pass through the first flange 110, and the second positioning hole 121 can pass through the second flange 120, thereby eliminating the need to consider the depth of the first positioning hole 111 and the second positioning hole 121, and eliminating the need to consider the insertion depth of the guide member 130 in the first positioning hole 111 and the second positioning hole 121, thereby reducing the design difficulty and manufacturing difficulty of the first positioning hole 111 and the second positioning hole 121.

[0041] In some embodiments, the first fixing hole 112 may pass through the first flange 110 , and the second fixing hole 122 may pass through the second flange 120 , which reduces the design difficulty and manufacturing difficulty of the first fixing hole 112 and the second fixing hole 122 .

[0042] In some embodiments, the flange structure 100 may further include a fixing member 140 . The fixing member 140 may be a bolt. The bolt may include a bolt head 141 and a screw rod 142 connected to each other.

[0043] The first fixing hole 112 may be a threaded hole, the second fixing hole 122 may be a countersunk hole, the bolt head 141 of the bolt may be located in the countersunk hole, and the screw 142 of the bolt may be inserted into the threaded hole, so that the fixing member 140 may connect and fix the first flange 110 and the second flange 120. In addition, since the bolt head 141 of the fixing member 140 is located in the countersunk hole, the fixing member 140 may be prevented from being exposed, which helps to reduce the loosening of the fixing member 140 due to other external forces, thereby improving the stability of the connection between the first flange 110 and the second flange 120.

[0044] For example, the fixing member 140 may be a hexagon socket head bolt, so as to facilitate installation of the fixing member 140 .

[0045] It can be understood that the first flange 110 can be provided with a plurality of first fixing holes 112, and the plurality of first fixing holes 112 can be distributed along the circumference of the first flange 110, for example, the plurality of first fixing holes 112 can be evenly distributed along the circumference of the first flange 110. Similarly, the second flange 120 can also be provided with a plurality of second fixing holes 122, and the plurality of second fixing holes 122 can be distributed along the circumference of the second flange 120, for example, the plurality of second fixing holes 122 can be evenly distributed along the circumference of the second flange 120. Correspondingly, the flange structure 100 can include a plurality of fixing members 140. Among them, a plurality can refer to two or more.

[0046] It can be understood that each first fixing hole 112 and each second fixing hole 122 can correspond to each other one by one, and each fixing member 140 can be inserted into one first fixing hole 112 and one second fixing hole 122 .

[0047] In some embodiments, the first flange 110 may be provided with two first positioning holes 111, the second flange 120 may be provided with two second positioning holes 121, and the flange structure 100 includes two guide members 130. One end of each guide member 130 is detachably plugged into a first positioning hole 111, and the other end of each guide member 130 is suitable for being plugged into an opposite second positioning hole 121. In this way, the two guide members 130 can stably limit the rotation of the second flange 120, so that there is no need to design the cross-sectional shapes of the guide members 130 and the second positioning holes 121. The first positioning holes 111 and the second positioning holes 121 can both be set as round holes, and the guide member 130 can also be set as a round shaft structure, which helps the first positioning holes 111, the second positioning holes 121 and the guide member 130 to be easier to process, reduces the manufacturing difficulty of the first flange 110, the second flange 120 and the guide member 130, and reduces the manufacturing cost.

[0048] In some embodiments, the two first positioning holes 111 may be symmetrically distributed, and the two second positioning holes 121 may also be symmetrically distributed, which helps the two guide members 130 to be inserted into the two second positioning holes 121 more quickly.

[0049] For the convenience of description, the connection between a first positioning hole 111 , a second positioning hole 121 and a guide member 130 will be explained below.

[0050] In some embodiments, the guide member 130 may include a threaded section 131 and a connecting section 132 connected to each other. The first positioning hole 111 may be a threaded hole. The threaded section 131 is inserted into the first positioning hole 111. The connecting section 132 is suitable for being inserted into the second positioning hole 121. In this way, the guide member 130 and the first positioning hole 111 are connected by threads, which helps the guide member 130 to be more conveniently inserted into the first positioning hole 111, thereby facilitating the installation and disassembly of the guide member 130.

[0051] In some embodiments, the diameter of the connecting section 132 may be larger than the diameter of the threaded section 131 , so that when the threaded section 131 is inserted into the first positioning hole 111 , the connecting section 132 may abut against the surface of the first flange 110 , which helps to more accurately determine the installation position of the guide member 130 .

[0052] In some embodiments, the shape of the connecting segment 132 may be adapted to the shape of the second positioning hole 121 . Specifically, the cross-sectional shape of the connecting segment 132 may be substantially the same as the cross-sectional shape of the second positioning hole 121 , so that the connecting segment 132 may be inserted into the second positioning hole 121 .

[0053] In some embodiments, the outer peripheral surface of the connecting section 132 may include a first arc surface and a first plane, and the inner peripheral surface of the second positioning hole 121 may include a second arc surface and a second plane. When the connecting section 132 is inserted into the second positioning hole 121, the first plane and the second plane are opposite to each other, and the first arc surface and the second arc surface are opposite to each other. In this way, the first plane can limit the second plane, which helps to prevent the second flange 120 from rotating, so that the first fixing hole 112 and the second fixing hole 122 can be aligned more stably and quickly.

[0054] The first plane and the second plane may fit together, or there may be a gap between the first plane and the second plane. Correspondingly, the first curved surface and the second curved surface may fit together, or there may be a gap between the first curved surface and the second curved surface.

[0055] The first curved surface may be a convex surface or a concave surface.

[0056] As an example, the first curved surface may be a convex surface, and the first curved surface and the first plane may be connected. For example, the cross-sectional shape of the connecting section 132 may be approximately semicircular.

[0057] As another example, the first curved surface may be a concave surface. It can be understood that since the first curved surface is a concave surface, the outer peripheral surface of the connecting segment 132 includes at least two first curved surfaces, and the two first curved surfaces and the first plane can be connected to form the outer peripheral surface of the connecting segment 132. Alternatively, since the first curved surface is a concave surface, the connecting segment 132 includes at least two first planes, and the two first planes and the first curved surface can be connected to form the outer peripheral surface of the connecting segment 132.

[0058] It is understandable that the number of the first curved surface can be one or more, and the number of the first plane can be one or more, which can be set according to the needs. In addition, since the shape of the second positioning hole 121 is adapted to the shape of the connecting section 132, the shape and connection method of the second curved surface and the second plane can refer to the shape and connection method of the first curved surface and the first plane, and no further description is given.

[0059] In some embodiments, the outer circumferential surface of the connecting section 132 may include a third plane and a fourth plane, and the inner circumferential surface of the second positioning hole 121 may include a fifth plane and a sixth plane. When the connecting section 132 is inserted into the second positioning hole 121, the third plane and the fifth plane are opposite to each other, and the fourth plane and the sixth plane are opposite to each other. In this way, the third plane can limit the fifth plane, and the fourth plane can limit the sixth plane, which helps to prevent the second flange 120 from rotating, so that the first fixing hole 112 and the second fixing hole 122 can be more stably aligned.

[0060] For example, the cross-sectional shape of the connecting section 132 may be a triangle, a quadrilateral or other polygonal shapes, and correspondingly, the cross-sectional shape of the second positioning hole 121 may also be a triangle, a quadrilateral or other polygonal shapes.

[0061] In some embodiments, the flange structure 100 may further include a first sealing ring 150. A first annular groove 113 may be recessed on the surface of the first flange 110 facing the second flange 120, and the first sealing ring 150 is disposed in the first annular groove 113. When the second flange 120 is connected to the first flange 110, the first sealing ring 150 abuts between the first flange 110 and the second flange 120. In this way, the first sealing ring 150 may be sealed between the first flange 110 and the second flange 120, which helps to prevent gas in the flange structure 100 from overflowing and improves the sealing performance of the flange structure 100.

[0062] It can be understood that the sealing groove can also be provided on the second flange 120. Specifically, the surface of the second flange 120 facing the first flange 110 can be recessed with a second annular groove, and the first sealing ring 150 can be disposed in the second annular groove.

[0063] In some embodiments, the flange structure 100 also includes a second sealing ring; a third annular groove is recessed on the surface of the first flange 110 facing the second flange 120, and the second sealing ring is arranged in the third annular groove. The third sealing groove can be spaced apart from the first sealing groove. When the second flange 120 is connected to the first flange 110, the second sealing ring is abutted between the first flange 110 and the second flange 120, and the second sealing ring and the first sealing ring 150 are spaced apart. In this way, the cooperation between the first sealing ring 150 and the second sealing ring can further enhance the sealing effect of the flange structure 100.

[0064] It can be understood that the sealing groove can also be provided on the second flange 120. Specifically, a fourth annular groove is recessed on the surface of the second flange 120 facing the first flange 110, and the second sealing ring is provided in the fourth annular groove.

[0065] It can be understood that the sealing groove can be set on the same or different flanges as needed. Specifically, the first annular groove 113 and the third annular groove can be set on the first flange 110 at the same time, or the second annular groove and the fourth annular groove can be set on the second flange 120 at the same time, or the first annular groove 113 can be set on the first flange 110 and the fourth annular groove can be set on the second flange 120, or the second annular groove can be set on the second flange 120 and the third annular groove can be set on the first flange 110.

[0066] In the flange structure 100 provided in the embodiment of the present application, the first flange 110 is provided with a first positioning hole 111 and a first fixing hole 112, and the second flange 120 is provided with a second positioning hole 121 and a second fixing hole 122. The second positioning hole 121 and the first positioning hole 111 are arranged opposite to each other, and the second fixing hole 122 and the first fixing hole 112 are arranged opposite to each other. One end of the guide member 130 is detachably plugged into the first positioning hole 111, and the other end is suitable for being inserted into the second positioning hole 121. In this way, the guide member 130 can play a guiding and positioning role, so that the first fixing hole 112 of the first flange 110 and the second fixing hole 122 of the second flange 120 can be quickly aligned, so as to facilitate the installation of the fixing structure in the first fixing hole 112 and the second fixing hole 122, which helps to quickly connect and fix the second flange 120 and the first flange 110. In addition, since the guide member 130 is a detachable structure, the first flange 110 and the second flange 120 only need to process the hole structure for installing the guide member 130 to install the guide member 130, which helps to reduce the manufacturing difficulty of the first flange 110 and the second flange 120.

[0067] The embodiments of the utility model are described in detail above in conjunction with the accompanying drawings, but the utility model is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the utility model. In addition, the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

Claims

1. A flange structure, characterized in that: include: A first flange, wherein the first flange is provided with a first positioning hole and a first fixing hole; a second flange, the second flange being arranged opposite to the first flange, the second flange being provided with a second positioning hole and a second fixing hole, the second positioning hole being arranged opposite to the first positioning hole, and the second fixing hole being arranged opposite to the first fixing hole; and A guide member, one end of which is detachably plugged into the first positioning hole, and the other end of which is suitable for being plugged into the second positioning hole.

2. The flange structure according to claim 1, characterized in that: The guide member includes a threaded section and a connecting section connected to each other. The first positioning hole is a threaded hole. The threaded section is inserted into the first positioning hole. The connecting section is suitable for being inserted into the second positioning hole.

3. The flange structure according to claim 2, characterized in that: The shape of the connecting section is adapted to the shape of the second positioning hole; The outer circumference of the connecting section includes a first arc surface and a first plane, and the inner circumference of the second positioning hole includes a second arc surface and a second plane; when the connecting section is inserted into the second positioning hole, the first plane and the second plane are opposite to each other, and the first arc surface and the second arc surface are opposite to each other.

4. The flange structure according to claim 2, characterized in that: The shape of the connecting section is adapted to the shape of the second positioning hole; The outer circumference of the connecting section includes a third plane and a fourth plane, and the inner circumference of the second positioning hole includes a fifth plane and a sixth plane. When the connecting section is inserted into the second positioning hole, the third plane is opposite to the fifth plane, and the fourth plane is opposite to the sixth plane.

5. The flange structure according to claim 2, characterized in that: The diameter of the connecting section is greater than the diameter of the threaded section.

6. The flange structure according to claim 1, characterized in that: The first flange is provided with two first positioning holes, the second flange is provided with two second positioning holes, and the flange structure includes two guide members, one end of each guide member is detachably plugged into one of the first positioning holes, and the other end is suitable for being inserted into an opposite second positioning hole.

7. The flange structure according to claim 6, characterized in that: The two first positioning holes are symmetrically distributed, and the two second positioning holes are symmetrically distributed.

8. The flange structure according to claim 1, characterized in that: The flange structure also includes a first sealing ring; A first annular groove is formed on the surface of the first flange facing the second flange, and the first sealing ring is disposed in the first annular groove; or a second annular groove is formed on the surface of the second flange facing the first flange, and the first sealing ring is disposed in the second annular groove; Wherein, when the second flange is connected to the first flange, the first sealing ring abuts between the first flange and the second flange.

9. The flange structure according to claim 8, characterized in that: The flange structure also includes a second sealing ring; A third annular groove is formed on the surface of the first flange facing the second flange, and the second sealing ring is disposed in the third annular groove; or a fourth annular groove is formed on the surface of the second flange facing the first flange, and the second sealing ring is disposed in the fourth annular groove; Wherein, when the second flange is connected to the first flange, the second sealing ring abuts between the first flange and the second flange, and the second sealing ring and the first sealing ring are spaced apart.

10. The flange structure according to claim 1, characterized in that: The flange structure also includes a fixing piece; the first fixing hole is a threaded hole, and the second fixing hole is a countersunk hole; the fixing piece is a bolt, the bolt head of the bolt is located in the countersunk hole, and the screw rod of the bolt is inserted into the threaded hole.

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