A flange connection structure with a multi-stage sealing structure

Abstract

This utility model discloses a flange connection structure with a multi-stage sealing structure applied in the field of flange connections. It includes a first flange, a second flange, and multiple fasteners for connecting the first and second flanges. An annular groove is formed at one end of the second flange near the first flange. A pair of air guide grooves are formed on the outer wall of the annular groove. Inspection grooves are formed at both ends of the second flange, and each pair of inspection grooves communicates with a pair of air guide grooves. A main inspection plate is connected inside the inspection grooves. A mesh is fixedly connected inside the air guide grooves. An outer sealing ring, a hard ring, and an inner sealing ring are fixedly connected at one end of the first flange near the second flange. The composite annular structure formed by the outer sealing ring, hard ring, and inner sealing ring cooperates with the annular groove to achieve double sealing of the medium inside the pipeline. Simultaneously, with the use of the main inspection plate and deformable particles, a visual warning can be provided to personnel when one of the sealing methods fails.

Description

Technical Field

[0001] This utility model relates to the field of flange connections, and in particular to a flange connection structure with a multi-stage sealing structure. Background Technology

[0002] In industrial production, flanges are commonly used to seal and reinforce the connection between water pipes and valves, extending the pipeline while preventing the leakage of liquids and gases at the connection.

[0003] For example, Chinese patent CN220453014U discloses a flange sealing structure in which, when fluid is flowing, the elastic seal can tightly abut against the second flange, thereby achieving a seal between the first and second flanges. When the fluid is not flowing, the elastic seal is not subjected to the impact force of the fluid. Because the elastic seal is not constantly subjected to the constant compressive force of the two flanges, it is not easily damaged or deformed, thus extending its service life.

[0004] Existing flanges are generally made up of flanges, gaskets and bolts connected together as a detachable connection of combined sealing structure. However, this structure lacks corresponding sealing and reinforcement equipment, and after long-term use, it is prone to liquid or gas leakage. At the same time, such small leaks are not easily detected by personnel, resulting in significant economic losses. Utility Model Content

[0005] The core of this utility model lies in the fact that the composite ring structure formed by the outer sealing ring, the hard ring and the inner sealing ring, in conjunction with the annular groove, achieves a double seal for the medium inside the pipeline, solving the problem of poor flange sealing in the prior art. At the same time, with the use of the main visual inspection plate and deformable particles, a visual reminder can be provided to personnel when one of the sealing methods fails.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A flange connection structure with a multi-stage sealing structure includes a first flange, a second flange, and multiple fasteners for connecting the first and second flanges. The second flange has an annular groove at one end near the first flange, and a pair of air guide grooves are formed on the outer wall of the annular groove. Inspection grooves are formed at both ends of the second flange, and each pair of inspection grooves communicates with a pair of air guide grooves. A main inspection plate is connected inside the inspection grooves, and a mesh is fixedly connected inside the air guide grooves. An outer sealing ring, a hard ring, and an inner sealing ring are fixedly connected to one end of the first flange near the second flange. The outer sealing ring, hard ring, and inner sealing ring are distributed sequentially from the outside to the inside and are fixedly connected to each other. The outer diameter of the outer sealing ring is the same as the outer diameter of the annular groove, and the inner diameter of the inner sealing ring is the same as the inner diameter of the annular groove. The annular groove is filled with multiple deformable particles.

[0008] Furthermore, the main inspection film includes a main ring and a main elastic membrane. The outer end of the main ring is fixedly connected to the inner wall of the inspection groove, and the edge end of the main elastic membrane is fixedly connected to the inner end of the main ring.

[0009] Optionally, a block and a secondary inspection piece can be used instead of the main inspection piece. There are multiple blocks, and all blocks are fixedly connected to the inner wall of the inspection slot. The secondary inspection piece is located on the side of the block away from the outside.

[0010] Optionally, the secondary inspection piece includes a secondary ring and a secondary elastic membrane fixedly connected to the inner end of the secondary ring. The flat end of the secondary ring near the stop is coated with a magnetic coating, and the stop is made of ferromagnetic material.

[0011] Optionally, the secondary inspection film also includes an operating rod fixedly connected to the end of the secondary annular plane.

[0012] Optionally, the outer wall of the secondary ring near the inspection slot has an arc-shaped structure, and the diameter of the secondary ring is the same as the inner diameter of the inspection slot.

[0013] Compared with existing technologies, the advantages of this utility model are:

[0014] This solution uses a composite ring structure formed by an outer sealing ring, a hard ring, and an inner sealing ring to cooperate with an annular groove. The surface contact sealing state between the outer sealing ring and the inner wall of the annular groove serves as the first sealing method, and the surface contact sealing state between the inner sealing ring and the inner wall of the annular groove serves as the second sealing method. This achieves double sealing of the inside of the pipeline, making it less likely for the medium inside the pipeline to leak at the connection.

[0015] Furthermore, when either the outer or inner sealing ring fails, moisture will enter the annular groove through the failed area and be absorbed by the deformed particles after passing through the mesh rubber gasket. This causes the main inspection plate to bulge outwards, providing a visual reminder to external personnel or maintenance staff that the sealing effect has been compromised. This allows personnel to quickly become aware that one of the sealing methods has failed. Meanwhile, the remaining unfailed sealing method can continue to provide leakage protection for the medium in the pipeline while personnel are unaware of the issue and are not repairing it, keeping the pipeline in normal transport condition and reducing economic losses.

[0016] In addition, considering the difficulty in replacing the main inspection piece, a stop block and a secondary inspection piece are used instead of the main inspection piece. This ensures that the two sealing methods are functioning properly while allowing for easy replacement of the secondary inspection piece. Attached Figure Description

[0017] Figure 1 This is a perspective view of the first embodiment of the present invention when it is not installed;

[0018] Figure 2This is a perspective view of the first embodiment of the present invention after installation;

[0019] Figure 3 This is a perspective view of the second flange plate in the first embodiment of this utility model;

[0020] Figure 4 This is a perspective view of the first flange plate in the first embodiment of this utility model;

[0021] Figure 5 This is a side view of the structure when not installed in the first embodiment of the present invention;

[0022] Figure 6 This is a side view of the installation structure in the first embodiment of the present invention;

[0023] Figure 7 This is a side view of the second flange in the first embodiment of the present invention.

[0024] Figure 8 This is a schematic diagram of the top surface structure during installation in the first embodiment of this utility model;

[0025] Figure 9 This is a schematic diagram of the top surface structure when the outer or inner sealing ring fails in the first embodiment of this utility model.

[0026] Figure 10 This is a perspective view of the second embodiment of the present utility model;

[0027] Figure 11 This is a perspective view of the auxiliary inspection plate during installation in the second embodiment of this utility model;

[0028] Figure 12 This is a schematic diagram of the top surface structure when the outer or inner sealing ring fails in the second embodiment of this utility model.

[0029] Figure 13 for Figure 12 A schematic diagram of the structure at point A in the middle.

[0030] Explanation of the labels in the diagram:

[0031] 1 First flange, 2 Second flange, 201 Annular groove, 202 Air guide groove, 203 Inspection groove, 3 Fastener, 4 Main inspection plate, 41 Main ring, 42 Main elastic membrane, 5 Mesh, 61 Outer sealing ring, 62 Hard ring, 63 Inner sealing ring, 7 Deformable particles, 8 Stop block, 9 Secondary inspection plate, 91 Secondary ring, 92 Secondary elastic membrane, 93 Operating rod, 10 Magnetic coating. Detailed Implementation

[0032] The technical solution will now be clearly and completely described with reference to the accompanying drawings in the embodiments of this utility model.

[0033] First implementation method:

[0034] Please see Figures 1 to 9 A flange connection structure with a multi-stage sealing structure includes a first flange 1, a second flange 2, and multiple fasteners 3 for connecting the first flange 1 and the second flange 2. The fasteners 3 include bolts and nuts. The first flange 1 and the second flange 2 have corresponding mounting holes. Bolts are inserted into the mounting holes of the first flange 1 and the second flange 2, and then tightened with nuts. This is the flange installation method in the prior art. The second flange 2 has an annular groove 201 at the end closest to the first flange 1. (See also...) Figure 3 and Figure 7 The outer ring wall of the annular groove 201 is provided with a pair of air guide grooves 202. The left and right ends of the second flange 2 are provided with inspection grooves 203. The pair of inspection grooves 203 are respectively connected to the pair of air guide grooves 202. The main inspection plate 4 is connected inside the inspection groove 203. The mesh 5 is fixedly connected inside the air guide groove 202.

[0035] Please see Figure 4 The first flange 1, near the end of the second flange 2, is fixedly connected to an outer sealing ring 61, a hard ring 62, and an inner sealing ring 63. The outer sealing ring 61, hard ring 62, and inner sealing ring 63 are distributed sequentially from the outside in and fixedly connected to each other. (See also...) Figure 5 and Figure 6 The outer diameter of the outer sealing ring 61 is the same as the outer diameter of the annular groove 201, and the inner diameter of the inner sealing ring 63 is the same as the inner diameter of the annular groove 201. That is, the composite ring structure formed by the outer sealing ring 61, the hard ring 62 and the inner sealing ring 63 matches the annular groove 201, but the width of the composite ring structure is smaller than the width (i.e., groove depth) of the annular groove 201. This allows the outer sealing ring 61 and the inner sealing ring 63 to fit and contact the outer and inner walls of the annular groove 201, respectively, after the composite ring structure is inserted into the annular groove 201. There is a certain space between the end of the composite ring structure and the rightmost inner wall (i.e., the bottom of the groove) of the annular groove 201. This space is filled with multiple deformable particles 7. The deformable particles 7 are made of water-swellable materials, such as water-swellable rubber. The aperture of the mesh 5 is smaller than the particle size of the deformable particles 7, which limits the deformable particles 7 and allows them to be stored normally in the annular groove 201 without affecting the gas flow between the annular groove 201 and the inspection groove 203.

[0036] Combination Figures 5 to 7As shown, during the use of this application, before fixing the first flange 1 and the second flange 2, an appropriate amount of deformable particles 7 can be placed in the annular groove 201. Since the first flange 1 and the second flange 2 are generally in a vertical state during installation, in order to prevent the deformable particles 7 in the annular groove 201 from rolling off easily, a mesh rubber gasket matching its size can be placed into the annular groove 201 after the deformable particles 7 are placed. Figure 7 The symbol H indicates that when placing the deformable particle 7 and the mesh rubber gasket, the second flange 2 is in a horizontal state (with the opening of the annular groove 201 facing upwards). The mesh rubber gasket and the annular groove 201 achieve stability through friction. The mesh rubber gasket also limits the deformable particle 7, preventing it from rolling off the annular groove 201 when the second flange 2 is in a vertical state. Later, when connecting the first flange 1 and the second flange 2, the composite ring structure can be inserted into the annular groove 201 until the first flange 1 and the second flange 2 are in contact with each other (e.g., ...). Figure 6 and Figure 8 As shown in the figure, the first flange 1 and the second flange 2 are then connected and fixed by fastener 3.

[0037] Please see Figure 2 and Figure 8 The main inspection plate 4 includes a main ring 41 and a main elastic membrane 42. The outer end of the main ring 41 is fixedly connected to the inner wall of the inspection groove 203, and the edge end of the main elastic membrane 42 is fixedly connected to the inner end of the main ring 41. The main elastic membrane 42 is made of elastic material, such as the elastic rubber material used to make balloons. In the initial state, the main elastic membrane 42 is in an undeformed state.

[0038] The most applicable scenario for this application is: connection of outdoor water supply pipelines. The sealing principle of this application is as follows:

[0039] After the first flange 1 and the second flange 2 are installed (as shown in the image), Figure 6 and Figure 8 As shown in the figure, the composite annular structure formed by the outer sealing ring 61, the hard ring 62 and the inner sealing ring 63 is located inside the annular groove 201. The surface contact sealing state between the outer sealing ring 61 and the inner wall of the annular groove 201 serves as the first sealing method, and the surface contact sealing state between the inner sealing ring 63 and the inner wall of the annular groove 201 serves as the second sealing method. This achieves double sealing of the inside of the pipeline, making it less likely for the medium inside the pipeline to leak at the connection.

[0040] When the outer sealing ring 61 fails to seal, external moisture (such as rainwater) can easily enter the annular groove 201 through the gap between the first flange 1 and the second flange 2, as well as the gap between the outer sealing ring 61 and the annular groove 201. When the inner sealing ring 63 fails to seal, internal water (such as rainwater) can easily enter the annular groove 201 through the gap between the first flange 1 and the second flange 2, as well as the gap between the inner sealing ring 63 and the annular groove 201. Whether the outer sealing ring 61 or the inner sealing ring 63 fails, moisture will enter the annular groove 201 through the failed part, and after passing through the mesh rubber gasket, it will be absorbed by the deformable particles 7, causing the deformable particles 7 to absorb water and expand, further occupying the space inside the annular groove 201. Figure 9 As shown, at this time, the air pressure in the annular groove 201 where the deformable particle 7 is located increases, causing the main elastic membrane 42 to bulge and expand to the outside, providing a visual reminder to external personnel or maintenance personnel about the damage to the sealing effect, so that personnel can quickly know that one of the sealing means has failed. In addition, the remaining sealing means (outer sealing ring 61 or inner sealing ring 63) that has not failed can continue to provide leakage protection for the medium in the pipeline when personnel do not notice or repair it, so that the pipeline is in normal transportation state and reduces economic losses.

[0041] Additional explanation: The flange connection structure provided in this application achieves a sealing effect by cooperating with 201 through a composite ring structure, which can eliminate the need for flange gaskets in the prior art.

[0042] Second implementation method:

[0043] This embodiment replaces the main inspection piece 4 with a stop block 8 and a secondary inspection piece 9. The remaining structure is consistent with the first embodiment, as detailed below: Please refer to... Figures 10 to 13 There are four stops 8 evenly distributed in a circle. All stops 8 are fixedly connected to the inner wall of the inspection slot 203. There is sufficient gap between adjacent stops 8 to facilitate the tilting and insertion of the sub-inspection piece 9 during disassembly and assembly. The sub-inspection piece 9 is installed on the side of the stops 8 away from the outside. The sub-inspection piece 9 includes a sub-ring 91, a sub-elastic membrane 92 fixedly connected to the inner end of the sub-ring 91, and an operating rod 93 fixedly connected to the flat end of the sub-ring 91. The sub-elastic membrane 92 is made of the same material as the main elastic membrane 42 and is initially in an undeformed state. The flat end of the sub-ring 91 near the stops 8 is coated with a magnetic coating 10. The stops 8 are made of ferromagnetic material, such as metal iron with anti-corrosion treatment. The annular outer wall of the sub-ring 91 near the inspection slot 203 has an arc surface structure, and the diameter of the sub-ring 91 is the same as the inner diameter of the inspection slot 203.

[0044] In the first embodiment, the main inspection piece 4 is fixedly installed, making it difficult to replace when the main elastic membrane 42 is damaged. To overcome this defect, this embodiment combines a fixedly installed stop block 8 with a detachable secondary inspection piece 9. While ensuring the normal implementation of the two sealing methods in the first embodiment, it also enables the convenient replacement of the secondary inspection piece 9.

[0045] The installation, removal, and use of the secondary inspection piece 9 are as follows: With the plane of the secondary elastic membrane 92 spatially perpendicular to the plane of the inspection slot 203, insert the secondary inspection piece 9 into the inspection slot 203 through the gap between the two pairs of stops 8. During insertion, hold the operating rod 93 with your fingers to easily adjust the tilt angle of the secondary inspection piece 9 (since the diameter of the secondary ring 91 is the same as the inner diameter of the inspection slot 203, the secondary inspection piece 9 can rotate freely in the inspection slot 203), gradually making the secondary inspection piece 9 vertical with the magnetic coating 10 facing outwards. After the secondary inspection piece 9 has completely passed the multiple stops 8 and entered the inner side of the inspection slot 203, and after adjusting the secondary inspection piece 9 to a vertical position, use the operating rod 93 to... When the ring 91 is pulled outward, the magnetic attraction between the magnetic coating 10 and the stop 8 causes the secondary ring 91 to fit tightly against the stop 8 and remain stable. At this time, the secondary elastic membrane 92 can play the same role as the primary elastic membrane 42 in the first embodiment. By observing the bulging state of the secondary elastic membrane 92, it can be determined whether the outer sealing ring 61 or the inner sealing ring 63 has failed. When the secondary elastic membrane 92 is damaged and the secondary inspection piece 9 needs to be replaced, the secondary inspection piece 9 is pushed into the inspection groove 203 and tilted by holding the operating rod 93 with your fingers. When the plane of the tilted secondary elastic membrane 92 is between the adjacent stops 8, the secondary inspection piece 9 can be taken out of the inspection groove 203 along the gap between the adjacent stops 8.

[0046] The above description is merely a preferred embodiment of this utility model; it encompasses all the protection scope of this utility model. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be covered within the protection scope of this utility model.

Claims

1. A flange connection structure with a multi-stage sealing structure, comprising a first flange (1), a second flange (2), and a plurality of fasteners (3) for connecting the first flange (1) and the second flange (2), characterized in that: The second flange (2) has an annular groove (201) at one end near the first flange (1). A pair of air guide grooves (202) are formed on the outer wall of the annular groove (201). Inspection grooves (203) are formed at both ends of the second flange (2). Each pair of inspection grooves (203) communicates with a pair of air guide grooves (202). A main inspection plate (4) is connected inside the inspection groove (203). A mesh (5) is fixedly connected inside the air guide groove (202). The first flange (1) 1) An outer sealing ring (61), a hard ring (62) and an inner sealing ring (63) are fixedly connected to one end near the second flange (2). The outer sealing ring (61), the hard ring (62) and the inner sealing ring (63) are distributed from the outside to the inside and fixedly connected to each other. The outer diameter of the outer sealing ring (61) is the same as the outer diameter of the annular groove (201). The inner diameter of the inner sealing ring (63) is the same as the inner diameter of the annular groove (201). The interior of the annular groove (201) is filled with multiple deformable particles (7).

2. The flange connection structure with a multi-stage sealing structure according to claim 1, characterized in that: The main inspection plate (4) includes a main ring (41) and a main elastic membrane (42). The outer end of the main ring (41) is fixedly connected to the inner wall of the inspection groove (203), and the edge end of the main elastic membrane (42) is fixedly connected to the inner end of the main ring (41).

3. The flange connection structure with a multi-stage sealing structure according to claim 1, characterized in that: The main inspection piece (4) is replaced by a block (8) and a secondary inspection piece (9). There are multiple blocks (8), and all blocks (8) are fixedly connected to the inner wall of the inspection slot (203). The secondary inspection piece (9) is located on the side of the block (8) away from the outside.

4. The flange connection structure with a multi-stage sealing structure according to claim 3, characterized in that: The sub-inspection piece (9) includes a sub-ring (91) and a sub-elastic membrane (92) fixedly connected to the inner end of the sub-ring (91). The sub-ring (91) is coated with a magnetic coating (10) on the flat end near the stop (8). The stop (8) is made of ferromagnetic material.

5. A flange connection structure with a multi-stage sealing structure according to claim 4, characterized in that: The sub-inspection piece (9) also includes an operating rod (93) fixedly connected to the planar end of the sub-ring (91).

6. A flange connection structure with a multi-stage sealing structure according to claim 4, characterized in that: The outer wall of the sub-ring (91) near the inspection groove (203) is an arc-shaped structure, and the diameter of the sub-ring (91) is the same as the inner diameter of the inspection groove (203).

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