A sealing structure for a toxic gas pipeline

Abstract

The utility model provides a kind of sealing structure of toxic gas pipeline delivery belongs to toxic gas sealing technical field, the sealing structure of toxic gas pipeline delivery includes sealing sleeve, sealing sleeve upper and lower sides are connected with screwing mechanism, mechanical seal module is arranged between sealing sleeve and screwing mechanism, screwing mechanism includes sealing shell, sealing shell is fixed with sealing sleeve by thread structure, mechanical seal module includes compression ring and sealing washer, multiple groups of compression spring are arranged between compression ring and sealing washer, sealing washer includes inner liner and outer plastic layer, outer plastic layer is respectively arranged in inner liner upper and lower two ends outside;Compression ring movably sets in sealing sleeve interior, bottom end is provided with the pressure block for extruding compression spring;Sealing washer sets in sealing sleeve interior, inner liner middle outer wall is fixedly connected with sealing sleeve inner wall, inner liner inboard is contacted with pipeline;The utility model can solve the problem that sealing reliability is poor, durability is insufficient, cannot adapt to complex working condition.

Description

Technical Field

[0001] This utility model belongs to the field of toxic gas sealing technology, specifically, it relates to a sealing structure for the pipeline transportation of toxic gases. Background Technology

[0002] During the pipeline transportation of toxic gases, the reliability of the sealing structure is directly related to production safety and environmental risk control. Currently, the industry mainly uses single mechanical seals or combined sealing methods. Traditional mechanical seals mostly rely on rubber or plastic gaskets connected to flanges, and the seal is achieved by generating preload through bolt tightening. This method is simple in structure and low in cost, and can meet basic sealing requirements in low-pressure, less corrosive gas transportation scenarios. Some combined seals add simple liquid seals or gas seal auxiliary structures to the mechanical seal, and further block gas leakage paths by filling with external media.

[0003] However, existing technologies reveal significant shortcomings under complex operating conditions. On the one hand, traditional sealing gaskets are susceptible to wear, aging, and elasticity failure due to long-term exposure to toxic gas corrosion, pipeline pressure fluctuations, and temperature changes. For example, in chemical production, when transporting highly corrosive gases such as chlorine and hydrogen sulfide, the service life of ordinary rubber sealing gaskets is typically only 3-6 months. The surface may crack and swell due to chemical erosion, leading to increased sealing gaps and a sharp rise in leakage risk. Simultaneously, the pre-tightening force of bolts is difficult to dynamically adapt to pressure changes. When pipeline pressure fluctuates, the sealing surface is prone to localized loosening, causing minor leaks to accumulate and become safety hazards. On the other hand, while some combined seals incorporate auxiliary structures, the coordination between components is insufficient to form an effective protection system. For instance, in simple liquid sealing devices, the liquid is easily dispersed or evaporated during sudden pressure changes in the pipeline, leading to seal failure. Furthermore, existing sealing structures mostly use rigid connections, lacking elastic compensation mechanisms, and cannot cope with sealing surface displacement caused by vibration, thermal expansion, and other factors.

[0004] Therefore, considering the above, existing technologies suffer from poor sealing reliability, insufficient durability, and inability to adapt to complex working conditions, making it difficult to meet the requirements of high-risk industries such as chemical engineering for the transportation of toxic gases. Utility Model Content

[0005] In view of this, the present invention provides a sealing structure for the pipeline transportation of toxic gases, which can solve the problems of poor sealing reliability, insufficient durability, and inability to adapt to complex working conditions.

[0006] This utility model is implemented as follows:

[0007] This utility model provides a sealing structure for the pipeline transportation of toxic gases, including a sealing sleeve. Tightening mechanisms are connected to the upper and lower sides of the sealing sleeve. A mechanical seal module is provided between the sealing sleeve and the tightening mechanisms. The tightening mechanism includes a sealing shell, which is tightened and fixed to the sealing sleeve by a threaded structure. The mechanical seal module includes a compression ring and a sealing washer. Multiple sets of compression springs are provided between the compression ring and the sealing washer. The sealing washer includes an inner liner and an outer plastic layer, with the outer plastic layer respectively located on the outer sides of the upper and lower ends of the inner liner. The compression ring is movably disposed inside the sealing sleeve, and a pressure block for compressing the compression springs is provided at its bottom end.

[0008] The technical advantages of the sealing structure for toxic gas pipeline transportation provided by this utility model are as follows: The sealing sleeve and the sealing shell are tightened and fixed by a threaded structure. The mechanical seal module, consisting of a compression ring, a compression spring, and double-layer sealing gaskets, allows for precise control of the axial preload by rotating the sealing shell. The elastic deformation of the compression spring compensates for the loosening of the sealing surface caused by temperature, pressure fluctuations, or vibration, avoiding localized failures caused by rigid contact in traditional sealing structures. Simultaneously, the inner lining and outer plastic layer work in concert: the inner lining resists corrosion from toxic gases, while the outer plastic layer provides structural support, effectively solving the problem of existing mechanical seals easily failing and leaking gas due to insufficient preload or limited material properties.

[0009] Based on the above technical solution, the sealing structure for toxic gas pipeline transportation of this utility model can be further improved as follows:

[0010] The sealing gasket is located inside the sealing sleeve, the outer wall of the middle part of the inner lining is fixedly connected to the inner wall of the sealing sleeve, and the inner side of the inner lining is in contact with the pipeline.

[0011] The beneficial effects of adopting the above-mentioned improved scheme are as follows: by placing the sealing gasket inside the sealing sleeve, and fixing the outer wall of the middle part of the inner lining layer to the inner wall of the sealing sleeve and contacting the pipeline on the inner side, this structural design effectively avoids the sealing gasket from shifting or flipping under the impact of high-pressure gas, ensuring that the sealing surface is always in close contact with the pipeline, enhancing the stability of the sealing structure, and further preventing gas leakage caused by gasket misalignment.

[0012] Furthermore, the top and bottom ends of the inner liner are provided with extensions, which are in sealing contact with the bottom end of the sealing shell and restrict the position of the outer plastic layer.

[0013] The beneficial effects of the above-mentioned improved scheme are as follows: The extended portions at the top and bottom of the inner liner layer form a second sealing contact with the bottom of the sealing shell, constructing a double sealing barrier. Even if leakage occurs at the inner sealing surface, gas is unlikely to overflow through the extended portions. Furthermore, the extended portions restrict the position of the outer plastic layer, preventing lateral extrusion under high pressure and ensuring that the outer plastic layer can stably transmit the pressure of the compression spring. This design further enhances the integrity and pressure resistance of the sealing structure, effectively solving the problem of leakage caused by material extrusion and tearing under high pressure in existing single-layer seals.

[0014] Furthermore, a slider is fixedly installed on the outside of the compression ring, and a slide rail adapted to the slider is opened on the inner wall of the sealing sleeve. The compression ring is slidably connected to the inner wall of the sealing sleeve through the slider, and the top of the compression ring contacts the sealing shell.

[0015] The beneficial effects of the above-mentioned improved scheme are as follows: the slider on the outside of the clamping ring is slidably connected to the slide rail on the inner wall of the sealing sleeve, and the top of the clamping ring contacts the sealing shell. This structure ensures that the clamping ring can only move axially during tightening, avoiding uneven wear of the sealing surface caused by rotation. At the same time, the symmetrically arranged sliders ensure that the spring force is evenly distributed on the sealing gasket, preventing excessive local pressure from causing failure. This improves the stability and reliability of the sealing structure during force transmission, better guarantees the sealing effect, and solves the problem of uneven sealing caused by the deflection of the clamping ring in traditional tightening mechanisms.

[0016] Furthermore, one side of the pressure block contacts the compression spring, and this contact side is provided with an inclined surface for gradually compressing the compression spring.

[0017] The beneficial effects of the above-mentioned improved scheme are as follows: An inclined surface is provided on one side of the pressure block that contacts the compression spring. When the sealing shell is rotated, the inclined surface allows the compression spring to be gradually compressed from the edge to the center, achieving a progressive loading of preload. This design avoids plastic deformation of the spring caused by instantaneous overload. Furthermore, by matching the slope of the inclined surface with the thread pitch, precise fine-tuning of the preload can be achieved. Compared to traditional sealing structures where a single application of preload can easily cause spring fatigue or damage to the sealing surface, this significantly extends the service life of the sealing structure.

[0018] Furthermore, the outer plastic layer has protrusions and recesses on its outer side, with the outer side of the protrusions contacting the inner side of the clamping ring to act as a fulcrum.

[0019] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the protrusion on the outer side of the outer plastic layer contacts the inner side of the compression ring to form a fulcrum, amplifying the pressure of the compression spring acting on the inner liner and increasing the sealing specific pressure; at the same time, the fulcrum design disperses the concentrated stress to a larger area, reducing local deformation of the sealing surface; it effectively solves the problem that the direct action of the compression spring force in the existing sealing structure easily leads to local stress concentration, making the sealing surface more uniformly stressed and enhancing the pressure resistance and reliability of the sealing structure.

[0020] Furthermore, a protruding guide post is provided on the recessed part, and a compression spring is sleeved on the outside of the guide post.

[0021] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the guide post in the recessed part is fitted with a compression spring, which can ensure that the compression spring maintains axial stability during compression and prevent lateral bending or collapse that would lead to failure of force transmission; at the same time, the cooperation between the guide post and the compression spring can absorb the vibration energy of the pipeline and reduce the loosening of the seal caused by vibration.

[0022] Furthermore, there are two sets of sliders, symmetrically arranged on the left and right sides of the clamping ring.

[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the two sets of sliders symmetrically arranged on the left and right sides of the clamping ring provide stable dual-support for the clamping ring, effectively preventing the clamping ring from tilting and ensuring uniform contact of the sealing surface.

[0024] Furthermore, the shape of the pressing block is wedge-shaped.

[0025] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the wedge-shaped pressure block causes the compression spring to generate different compression amounts at different positions, forming a pressure gradient from the inside to the outside. This pressure distribution is more in line with the directional pressure requirements of the pipeline. At the same time, the wedge-shaped inclined surface and the compression spring cooperate to produce a self-locking effect after the pre-tightening force is reached.

[0026] Furthermore, the inner lining is made of PTFE, and the outer plastic layer is made of PFA.

[0027] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the inner lining layer uses PTFE and the outer plastic layer uses PFA. PTFE's excellent chemical stability resists strong corrosive gases, while PFA provides additional chemical protection while maintaining high toughness.

[0028] Compared with existing technologies, the beneficial effects of the sealing structure for toxic gas pipeline transportation provided by this utility model are as follows: The threaded tightening structure of the sealing sleeve and the sealing shell, combined with a compression spring, achieves precise control and dynamic compensation of the preload, effectively addressing pressure and temperature fluctuations; the slider and slideway design ensures stable axial movement of the clamping ring, avoiding uneven wear on the sealing surface; the wedge-shaped pressure block and the outer plastic layer fulcrum structure optimize force distribution, improving the sealing specific pressure. Simultaneously, the outer extension of the inner liner and the sealing shell form a double sealing barrier, preventing gas leakage and material extrusion. In terms of materials, the combination of a PTFE inner liner and a PFA outer plastic layer balances strong corrosion resistance and high toughness, adapting to extreme chemical environments and temperature changes. Overall, this solution, through multi-component collaborative design, solves the problems of easy aging, insufficient preload, and uneven stress on the sealing surface in traditional sealing structures, forming an adaptive and highly reliable sealing system that meets the requirements of high-risk industries such as chemical engineering for toxic gas transportation. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 A schematic diagram of a sealed structure for the pipeline delivery of toxic gases;

[0031] Figure 2 This is a schematic diagram of the mating structure of the compression ring and the sealing gasket;

[0032] The attached diagram lists the components represented by each number as follows:

[0033] 10. Sealing sleeve; 11. Tightening mechanism; 111. Sealing shell; 12. Mechanical seal module; 121. Compression ring; 122. Compression spring; 123. Sealing gasket; 1231. Inner liner; 1232. Outer plastic layer; 124. Outer extension; 125. Pressure block; 13. Protrusion; 14. Recess; 141. Guide post. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0035] like Figure 1 Figure 2 shows an embodiment of a sealing structure for toxic gas pipeline transportation provided by this utility model. In this embodiment, it includes a sealing sleeve 10, and a tightening mechanism 11 is connected to the upper and lower sides of the sealing sleeve 10. A mechanical sealing module 12 is provided between the sealing sleeve 10 and the tightening mechanism 11. The tightening mechanism 11 includes a sealing shell 111, which is tightened and fixed to the sealing sleeve 10 by a threaded structure. The mechanical sealing module 12 includes a compression ring 121 and a sealing washer 123. Multiple sets of compression springs 122 are provided between the compression ring 121 and the sealing washer 123. The sealing washer 123 includes an inner lining layer 1231 and an outer plastic layer 1232. The outer plastic layer 1232 is respectively provided on the outer side of the upper and lower ends of the inner lining layer 1231. The compression ring 121 is movably disposed inside the sealing sleeve 10, and a pressure block 125 for compressing the compression spring 122 is provided at the bottom end.

[0036] In the above technical solution, the sealing gasket 123 is disposed inside the sealing sleeve 10, the outer wall of the middle part of the inner lining 1231 is fixedly connected to the inner wall of the sealing sleeve 10, and the inner side of the inner lining 1231 is in contact with the pipeline.

[0037] Furthermore, in the above technical solution, the top and bottom ends of the inner liner 1231 are provided with extension portions 124, which are in sealing contact with the bottom end of the sealing shell 111 through the extension portions 124, while restricting the position of the outer plastic layer 1232.

[0038] Furthermore, in the above technical solution, a slider is fixedly provided on the outer side of the clamping ring 121, and a slide rail adapted to the slider is opened on the inner wall of the sealing sleeve 10. The clamping ring 121 is slidably connected to the inner wall of the sealing sleeve 10 through the slider, and the top of the clamping ring 121 contacts the sealing shell 111.

[0039] Furthermore, in the above technical solution, one side of the pressure block 125 contacts the compression spring 122, and the contact side is provided with an inclined surface for gradually compressing the compression spring 122.

[0040] Furthermore, in the above technical solution, the outer plastic layer 1232 is provided with a protrusion 13 and a recess 14 on the outer side. The outer side of the protrusion 13 contacts the inner side of the clamping ring 121 and serves as a fulcrum.

[0041] Furthermore, in the above technical solution, a protruding guide post 141 is provided on the recessed part 14, and a compression spring 122 is sleeved on the outside of the guide post 141.

[0042] Furthermore, in the above technical solution, there are two sets of sliders, symmetrically arranged on the left and right sides of the clamping ring 121.

[0043] Furthermore, in the above technical solution, the shape of the pressure block 125 is wedge-shaped.

[0044] Furthermore, in the above technical solution, the inner lining layer 1231 is made of PTFE, and the outer plastic layer 1232 is made of PFA.

[0045] Specifically, the principle of this invention is as follows: the tightening mechanism generates axial pressure by rotating the sealing shell, which, combined with the elastic deformation of the compression spring, forms a dynamic preload compensation mechanism; the guide structure of the slider and slide rail restricts the movement trajectory of the clamping ring, ensuring that the pressure is evenly transmitted to the sealing gasket; the wedge-shaped pressure block and the fulcrum design of the outer plastic layer amplify the sealing pressure, and the inclined surface achieves progressive loading, avoiding stress concentration. In the double sealing barrier, the outer extension of the inner liner contacts the sealing shell to form a secondary sealing effect, which, together with the inner liner of the primary seal, blocks the gas leakage path. In terms of material principles, the PTFE inner liner resists highly corrosive gases due to its chemical inertness, while the PFA outer plastic layer provides structural support with its high toughness and good processability. The similar coefficients of thermal expansion of both ensure structural stability during long-term use; through force transmission, motion constraint, and material property matching, efficient sealing and adaptability to operating conditions are achieved.

Claims

1. A sealing structure for the pipeline transportation of toxic gases, comprising a sealing sleeve, tightening mechanisms connected to the upper and lower sides of the sealing sleeve, and a mechanical seal module disposed between the sealing sleeve and the tightening mechanisms, characterized in that, The tightening mechanism includes a sealing shell, which is tightened and fixed to the sealing sleeve by a threaded structure. The mechanical seal module includes a pressure ring and a sealing washer. Multiple sets of pressure springs are provided between the pressure ring and the sealing washer. The sealing washer includes an inner liner and an outer plastic layer, with the outer plastic layer respectively located on the outer side of the upper and lower ends of the inner liner. The pressure ring is movably located inside the sealing sleeve, and a pressure block for squeezing the pressure spring is provided at the bottom end.

2. The sealing structure for toxic gas pipeline transportation according to claim 1, characterized in that, The sealing gasket is placed inside the sealing sleeve, the outer wall of the middle part of the inner lining is fixedly connected to the inner wall of the sealing sleeve, and the inner side of the inner lining is in contact with the pipeline.

3. The sealing structure for toxic gas pipeline transportation according to claim 2, characterized in that, The inner liner has extensions at its top and bottom, which make sealing contact with the bottom of the sealing shell and restrict the position of the outer plastic layer.

4. The sealing structure for toxic gas pipeline transportation according to claim 3, characterized in that, A slider is fixedly installed on the outside of the compression ring, and a slide rail adapted to the slider is opened on the inner wall of the sealing sleeve. The compression ring is slidably connected to the inner wall of the sealing sleeve through the slider, and the top of the compression ring contacts the sealing shell.

5. The sealing structure for toxic gas pipeline transportation according to claim 4, characterized in that, One side of the pressure block contacts the compression spring, and this contact side is provided with an inclined surface for gradually compressing the compression spring.

6. The sealing structure for toxic gas pipeline transportation according to claim 5, characterized in that, The outer plastic layer has protrusions and recesses on its outer side. The outer side of the protrusions contacts the inner side of the clamping ring to act as a fulcrum.

7. The sealing structure for toxic gas pipeline transportation according to claim 6, characterized in that, The recessed part is provided with a raised guide post, and the compression spring is sleeved on the outside of the guide post.

8. The sealing structure for toxic gas pipeline transportation according to claim 7, characterized in that, There are two sets of sliders, symmetrically arranged on the left and right sides of the clamping ring.

9. A sealing structure for toxic gas pipeline transportation according to claim 8, characterized in that, The shape of the pressing block is wedge-shaped.

10. A sealing structure for toxic gas pipeline transportation according to claim 9, characterized in that, The inner lining is made of PTFE, and the outer plastic layer is made of PFA.

Images