Metallic spiral wound gasket for pipe sealing

Abstract

The utility model discloses a metal winding gasket for pipeline sealing, including inside reinforcing ring, outside reinforcing ring, winding layer, inside reinforcing ring both sides fixedly connected with the inside baffle, outside reinforcing ring both sides fixedly connected with the outside baffle, winding layer is set between the inside baffle and the outside baffle, inside reinforcing ring and outside reinforcing ring inside are equipped with several groups of lift grooves, the inside sliding connection of lift groove has the lift piece, the one side fixedly connected with connecting rod of lift piece, the fixedly connected with contact ring of connecting rod penetration inside reinforcing ring and outside reinforcing ring, both sides contact ring closely winding layer both sides, first spring is fixedly connected between lift piece and lift groove, first spring is set on the outside of connecting rod, and sealing face adhesion degree improves significantly, and medium leakage rate reduces, and it is unnecessary to overhaul frequently.

Description

Technical Field

[0001] This utility model relates to the field of pipeline sealing technology, specifically to metal spiral wound gaskets for pipeline sealing. Background Technology

[0002] In industrial piping systems, the sealing performance of flange connections directly determines the system's operational safety—metal spiral wound gaskets, due to their high pressure resistance, wide temperature range, and strong adaptability, have become a core component for pipeline sealing. However, existing metal spiral wound gaskets have the following technical defects in practical applications, which can easily lead to seal failure or increased maintenance costs:

[0003] Lack of elastic compensation and poor sealing reliability: The sealing surface of traditional metal spiral wound gaskets is a rigid fit structure. When the pipeline undergoes slight displacement due to medium pressure fluctuations, temperature changes (thermal expansion and contraction), or vibration, gaps easily appear on the sealing surface, and the medium (such as liquid or gas) leaks through the gaps. The leakage rate is high, requiring frequent shutdowns for maintenance. Loose connection between inner and outer rings and easy disassembly: The inner and outer reinforcing rings of most gaskets are only limited by friction with the spiral wound layer, without an active locking structure. When installing or disassembling flanges, the inner and outer rings are easy to separate from the spiral wound layer, causing the gasket to disintegrate. The entire set of gaskets needs to be replaced, increasing maintenance costs. Utility Model Content

[0004] The purpose of this invention is to provide a metal spiral wound gasket for pipe sealing, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a metal spiral wound gasket for pipe sealing, comprising an inner reinforcing ring, an outer reinforcing ring, and a spiral wound layer. Inner retaining rings are fixedly connected to both sides of the inner reinforcing ring, and outer retaining rings are fixedly connected to both sides of the outer reinforcing ring. The spiral wound layer is sleeved between the inner and outer retaining rings. Several sets of lifting grooves are formed inside the inner and outer reinforcing rings. Lifting plates are slidably connected inside the lifting grooves. A connecting rod is fixedly connected to one side of each lifting plate. The connecting rod penetrates the inner and outer reinforcing rings and is fixedly connected to a contact ring. The contact rings on both sides are tightly attached to both sides of the spiral wound layer. A first spring is fixedly connected between the lifting plate and the lifting groove, and the first spring is sleeved on the outside of the connecting rod.

[0006] Preferably, the inner retaining ring has several sets of mounting grooves inside, a connecting piece is slidably connected inside the mounting groove, a locking rod is fixedly connected to one side of the connecting piece, and a locking block is fixedly connected to both sides of the locking rod through the mounting groove on the other side. The outer retaining ring has a locking groove on its inner side facing the locking rod, a first positioning groove that matches the locking block is opened inside the locking groove, a rotating groove is opened outside the first positioning groove, and a second positioning groove that matches the locking block is opened outside the rotating groove. The locking groove, the first positioning groove, the rotating groove, and the second positioning groove are connected.

[0007] Preferably, a second spring is fixedly connected between the lower part of the connecting piece and the inner wall of the mounting groove.

[0008] Preferably, an inner limiting rod is fixedly connected to the lower part of the connecting piece. The inner limiting rod is sleeved on the inner wall of one side of the second spring, and an outer limiting ring is sleeved on the other side of the second spring. The outer limiting ring is fixedly connected to the inside of the mounting groove.

[0009] Preferably, a push ring is fixedly connected to the outer side of the locking rod.

[0010] Preferably, the outer side of the push ring has several sets of rotating teeth.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. This utility model uses a first spring to push the contact ring to always keep it tightly against the winding layer. When the pipeline has gaps due to vibration, thermal expansion and contraction, the first spring automatically compensates for the displacement, which significantly improves the sealing surface fit, reduces the media leakage rate, and eliminates the need for frequent maintenance.

[0013] 2. In addition, after the locking block is inserted into the second positioning groove, the second spring provides a continuous pre-tightening force, which improves the connection strength between the inner and outer rings, eliminates the risk of disintegration when installing or disassembling the flange, and increases the reusability of the gasket. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0015] Figure 2 This is a three-dimensional structural cross-sectional view of the present invention;

[0016] Figure 3 This is a three-dimensional structural cross-sectional view of the present invention.

[0017] Figure 4 This is an enlarged view of the structure at point A of this utility model;

[0018] Figure 5 This is an enlarged view of the structure at point B of this utility model.

[0019] In the diagram: 1. Inner reinforcing ring; 2. Wrapping layer; 3. Outer reinforcing ring; 4. Inner retaining ring; 5. Outer retaining ring; 6. Lifting groove; 7. Lifting plate; 8. Connecting rod; 9. Contact ring; 10. First spring; 11. Mounting groove; 12. Locking rod; 13. Connecting plate; 14. Locking block; 15. Locking groove; 16. First positioning groove; 17. Rotation groove; 18. Second positioning groove; 19. Second spring; 20. Inner limiting rod; 21. Outer limiting ring; 22. Pushing ring; 23. Rotating tooth. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-5 This utility model provides a technical solution: a metal spiral wound gasket for pipe sealing, including an inner reinforcing ring 1, an outer reinforcing ring 3, and a spiral wound layer 2. The inner reinforcing ring 1 is fixedly connected to the two sides by welding with an inner retaining ring 4, and the outer reinforcing ring 3 is fixedly connected to the two sides by welding with an outer retaining ring 5. The spiral wound layer 2 is sleeved between the inner retaining ring 4 and the outer retaining ring 5 to form an annular sealing surface. Several sets of lifting grooves 6 are evenly opened along the circumference inside the inner reinforcing ring 1 and the outer reinforcing ring 3. Lifting plates 7 are slidably connected inside the lifting grooves 6. A connecting rod 8 is fixedly connected to the side of the lifting plate 7 near the spiral wound layer 2 by welding. After the connecting rod 8 penetrates the inner reinforcing ring 1 and the outer reinforcing ring 3, a contact ring 9 is fixedly connected by welding. The two contact rings 9 are tightly attached to the two sides of the spiral wound layer 2. A first spring 10 is fixedly connected to the side of the lifting plate 7 away from the spiral wound layer 2 and the inner wall of the lifting groove 6 by spot welding. The first spring 10 is sleeved on the outside of the connecting rod 8 to prevent the first spring 10 from shifting.

[0022] The inner retaining ring 4 has several sets of mounting grooves 11 evenly distributed around its circumference. A connecting piece 13 is slidably connected inside each mounting groove 11. A locking rod 12 is welded to the side of the connecting piece 13 closest to the outer retaining ring 5. The end of the locking rod 12 away from the connecting piece 13 penetrates both sides of the mounting groove 11 and is welded to a locking block 14. A locking groove 15 is formed on the inner side of the outer retaining ring 5, directly opposite the locking rod 12. A first positioning groove 16, fan-shaped, is formed inside the locking groove 15 to engage with the locking block 14. The first positioning groove 16 has an arc consistent with the locking block 14 and is used for initial positioning. An annular rotating groove 17 is provided on the outside of the first positioning groove 16. The width of the rotating groove 17 is adapted to the thickness of the locking block 14, allowing the locking block 14 to rotate. A second positioning groove 18 is provided on the outside of the rotating groove 17 to cooperate with the locking block 14. The second positioning groove 18 is symmetrical with the first positioning groove 16. After the locking block 14 is rotated ninety degrees, it is inserted to achieve fixation. The locking groove 15, the first positioning groove 16, the rotating groove 17 and the second positioning groove 18 are connected to form a complete locking path.

[0023] A second spring 19 is fixedly connected to the lower part of the connecting piece 13 and the inner wall of the mounting groove 11 by spot welding. Under normal conditions, the connecting piece 13 is pushed upward so that the locking block 14 is tightly attached to the inner wall of the second positioning groove 18 to prevent loosening.

[0024] The lower part of the connecting piece 13 is fixedly connected to an inner limiting rod 20 by welding. The inner limiting rod 20 is sleeved on the inner wall of one side of the second spring 19 to limit the inner deformation of the second spring 19. An outer limiting ring 21 is sleeved on the other side of the second spring 19. The outer limiting ring 21 is fixedly connected to the inside of the mounting groove 11 by spot welding to limit the outer deformation of the second spring 19 and prevent the second spring 19 from shifting.

[0025] A push ring 22 is fixedly connected to the outer side of the locking rod 12 by welding, which facilitates manual operation;

[0026] The outer side of the push ring 22 is evenly provided with several sets of rotating teeth 23 along the circumference to increase the friction of the hand and prevent slippage during operation.

[0027] Working principle: When using this utility model, the winding layer 2 is sleeved between the inner retaining ring 4 and the outer retaining ring 5 to ensure that both sides of the winding layer 2 are flush with the end faces of the inner retaining ring 4 and the outer retaining ring 5 without any offset;

[0028] Locking the inner and outer rings: Press the rotating tooth 23 of the push ring 22 with your finger to push the push ring 22 downward, causing the locking rod 12 and the connecting piece 13 to slide downward synchronously. The connecting piece 13 compresses the second spring 19, and the inner limiting rod 20 slides along the inner side of the outer limiting ring 21 to ensure that the second spring 19 does not deviate. Rotate the push ring 22 so that the locking block 14 on the locking rod 12 is aligned with the locking groove 15 of the outer stop ring 5. Insert the locking rod 12 into the locking groove 15 until the locking block 14 enters the first positioning groove 16. Release the push ring 22, and the second spring 19 resets and pushes the connecting piece 13 upward, causing the locking block 14 to rotate along the rotating groove 17. Due to the upward force of the second spring 19 and the guiding effect of the inner wall of the rotating groove 17, the locking block 14 automatically rotates ninety degrees and finally gets stuck in the second positioning groove 18. The inner reinforcing ring 1 and the outer reinforcing ring 3 are firmly connected, and the assembly is completed.

[0029] Place the assembled gasket into the sealing groove of the pipe flange, ensuring that the inner reinforcing ring 1 is coaxial with the inner diameter of the pipe and the outer reinforcing ring 3 is adapted to the flange sealing groove. Align the bolt holes on both sides of the flange, insert the bolts and tighten them gradually. When the flange presses the gasket, the spiral wound layer 2 deforms slightly, and the contact ring 9 is compressed by the flange pressure against the first spring 10. The first spring 10 stores elastic potential energy to prepare for subsequent compensation. During pipeline operation, if the flange sealing surface is gapped due to medium pressure fluctuations, temperature changes or vibrations, the first spring 10 releases elastic potential energy, pushing the lifting plate 7 to slide along the lifting groove 6 towards the spiral wound layer 2. The lifting plate 7 drives the contact ring 9 to move synchronously through the connecting rod 8. The contact ring 9 always adheres tightly to the spiral wound layer 2 and the flange sealing surface, eliminating gaps and maintaining a sealing state.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A metal spiral wound gasket for pipe sealing, comprising an inner reinforcing ring (1), an outer reinforcing ring (3), and a spiral wound layer (2), characterized in that: The inner reinforcing ring (1) is fixedly connected to the inner retaining ring (4) on both sides, and the outer reinforcing ring (3) is fixedly connected to the outer retaining ring (5) on both sides. The winding layer (2) is sleeved between the inner retaining ring (4) and the outer retaining ring (5). The inner reinforcing ring (1) and the outer reinforcing ring (3) are provided with several sets of lifting grooves (6). The lifting grooves (6) are slidably connected to the lifting plates (7). The lifting plates (7) are fixedly connected to one side with a connecting rod (8). The connecting rod (8) penetrates the inner reinforcing ring (1) and the outer reinforcing ring (3) and is fixedly connected to a contact ring (9). The contact rings (9) on both sides are tightly attached to both sides of the winding layer (2). The lifting plates (7) and the lifting grooves (6) are fixedly connected with a first spring (10). The first spring (10) is sleeved on the outside of the connecting rod (8).

2. The metal spiral wound gasket for pipe sealing according to claim 1, characterized in that: The inner retaining ring (4) has several sets of mounting grooves (11) inside. A connecting piece (13) is slidably connected inside the mounting groove (11). A locking rod (12) is fixedly connected to one side of the connecting piece (13). A locking block (14) is fixedly connected to both sides of the locking rod (12) through the mounting groove (11). A locking groove (15) is opened on the inner side of the outer retaining ring (5) facing the locking rod (12). A first positioning groove (16) that matches the locking block (14) is opened on the inner side of the locking groove (15). A rotating groove (17) is opened on the outer side of the first positioning groove (16). A second positioning groove (18) that matches the locking block (14) is opened on the outer side of the rotating groove (17). The locking groove (15), the first positioning groove (16), the rotating groove (17), and the second positioning groove (18) are connected.

3. The metal spiral wound gasket for pipe sealing according to claim 2, characterized in that: A second spring (19) is fixedly connected between the lower part of the connecting piece (13) and the inner wall of the mounting groove (11).

4. The metal spiral wound gasket for pipe sealing according to claim 3, characterized in that: The lower part of the connecting piece (13) is fixedly connected to an inner limiting rod (20), the inner limiting rod (20) is sleeved on the inner wall of one side of the second spring (19), and an outer limiting ring (21) is sleeved on the other side of the second spring (19), the outer limiting ring (21) is fixedly connected to the inside of the mounting groove (11).

5. The metal spiral wound gasket for pipe sealing according to claim 2, characterized in that: A push ring (22) is fixedly connected to the outside of the locking rod (12).

6. The metal spiral wound gasket for pipe sealing according to claim 5, characterized in that: The outer side of the push ring (22) is provided with several sets of rotating teeth (23).

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