Flange with good sealing performance for petrochemical engineering
By adopting a flange butt joint structure with raised face and a spring-loaded bolt design in the flanges used in petrochemical engineering, the problems of poor sealing performance and loose bolts of traditional flanges have been solved, achieving higher sealing performance and stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-27
- Publication Date
- 2026-04-07
AI Technical Summary
Traditional flanges used in petrochemical engineering have poor sealing performance, and the bolts and nuts are prone to loosening, which affects the sealing effect during long-term use.
The flange connection structure with concave and convex shapes uses an inner convex snap-fit interface and an inner concave snap-fit groove design, combined with a compression spring and anti-slip groove, to improve the blocking sealing performance. The compression spring squeezes the bolt to generate pressure and prevents rotation and slippage. The external anti-slip groove also improves the tightness of the nut.
It improves the flange's sealing performance, ensures a tighter and more secure nut installation, maintains high sealing performance over long-term use, prevents bolt stripping, and enhances the flange's stability and sealing effect.
Smart Images
Figure CN224094010U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of flanges for petrochemical engineering with good sealing performance, and more specifically, to flanges for petrochemical engineering with good sealing performance. Background Technology
[0002] Petrochemical engineering refers to the entire process from petrochemical raw materials such as oil and natural gas to chemical products, including exploration, development, processing, and conversion. Specifically, petrochemical engineering first locates and discovers potential oil and natural gas resources through geological exploration and drilling; then, production is carried out through the construction of oil and gas fields and the installation of equipment; finally, crude oil and natural gas are transformed into petrochemical products such as gasoline, diesel, lubricating oil, ethylene, and propylene through refining, cracking, and synthesis processes. Petrochemical engineering plays a vital role in the national economy, involving multiple aspects such as petroleum processing, chemical production, and energy supply. Petrochemical products are widely used in agriculture, construction, energy, transportation, and other fields, and the development of petrochemical engineering directly affects the development level of these fields. Furthermore, petrochemical engineering achieves efficient conversion of petrochemical raw materials into products through rational process flows and advanced technology and equipment.
[0003] In petrochemical engineering, pipeline transportation is predominant, and these pipelines need to be connected by flanges. A flange connection is a detachable joint in which two pipes, fittings, or equipment are first fixed to a flange, then a flange gasket is placed between the two flanges, and finally the two flanges are tightened with bolts to make them tightly connected. It can realize the connection between stationary pipelines and rotating or reciprocating equipment. In traditional technology, the two flanges are butted together, and the planes are fixedly installed. Its sealing performance is poor, and the external connection is made by bolts and nuts. During use, the pipeline transportation will generate vibration. Over a long period of use, the bolts and nuts are easy to loosen, affecting the sealing performance of the flange. Utility Model Content
[0004] To address the problems existing in the prior art, the purpose of this utility model is to provide a flange for petrochemical engineering with good sealing performance. By adopting a flange mating structure with concave and convex joints, it can be mated with concave and convex joints, which improves the blocking sealing performance. After the pipeline is fixed externally by bolts and nuts, a compression spring is set at the inner end to compress the bolts, which exerts pressure on the bolts and will not rotate or slip. With the help of external anti-slip grooves, the nut installation is more tight and secure, which improves the sealing performance for long-term use.
[0005] To solve the above problems, the present invention adopts the following technical solution.
[0006] A flange for petrochemical engineering with good sealing performance includes a first mating flange and a second mating flange. The first and second mating flanges are fixed together by bolts and nuts. The inner surface of the first mating flange is provided with an internally protruding snap-fit interface, and the inner surface of the second mating flange is provided with an internally recessed snap-fit groove. The outer surface of the internally protruding snap-fit interface snaps into the inner surface of the internally recessed snap-fit groove. The inner surface of the second mating flange is provided with an inner ring mating protrusion, and the inner surface of the first mating flange is provided with an inner ring mating groove. The outer surface of the inner ring mating protrusion snaps into the inner surface of the inner ring mating groove. On the side surface, the first and second mating flanges are provided with bolt mounting holes. The outer surface of the bolts is inserted through the bolt mounting holes. The outer surface of the bolt mounting holes of the first mating flange is provided with a positioning groove. The positioning groove is filled with a compression spring. By adopting a flange mating structure with concave and convex parts, the concave and convex parts can be mated together, which improves the blocking sealing performance. After the pipe is fixed by bolts and nuts on the outside, the compression spring at the inner end squeezes the bolt, which generates pressure on the bolt and will not rotate or slip. With the help of the external anti-slip groove, the nut is installed more tightly and firmly, which improves the sealing performance for long-term use.
[0007] Furthermore, a washer is fitted onto the outer end surface of the bolt. The washer is a steel ring washer, and its inner surface is pressed against the outer surface of the compression spring. The compression spring is compressed and retracted into the positioning groove of the first mating flange.
[0008] Furthermore, the outer surface of the bolt mounting holes of the second mating flange is provided with anti-slip grooves.
[0009] Furthermore, the anti-slip groove adopts an inclined groove structure, which is evenly distributed around the outer surface of the bolt mounting holes of the second mating flange (after the nut is tightened, it can fit against the anti-slip groove surface, which increases friction after tightening and is not easy to strip the threads; the installation is stable and the sealing performance is high during long-term use).
[0010] Furthermore, a rubber ring gasket is installed on the inner surface of the inner ring mating groove of the first mating flange.
[0011] Furthermore, the eight sets of bolt mounting holes are distributed on the outer surfaces of the first and second mating flanges.
[0012] Furthermore, the outer surface of the inner convex snap-fit interface of the first mating flange is tightly fitted to the inner surface of the inner concave snap-fit groove of the second mating flange.
[0013] Compared with existing technologies, the advantages of this utility model are:
[0014] (1) By adopting a flange connection structure with concave and convex settings, it can be connected with concave and convex snap-fit, which improves the blocking sealing performance. After the pipe is fixed by bolts and nuts on the outside, the inner end is set with a compression spring to squeeze the bolt, which generates pressure on the bolt and will not rotate or slip. With the external anti-slip groove, the nut is installed more tightly and firmly, which improves the sealing performance for long-term use. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0016] Figure 2 This is a first schematic diagram of the first mating flange of this utility model;
[0017] Figure 3 This is a second schematic diagram of the first mating flange of this utility model;
[0018] Figure 4 This is a first schematic diagram of the second mating flange of this utility model;
[0019] Figure 5 This is a second schematic diagram of the second mating flange of this utility model.
[0020] Explanation of the labels in the diagram:
[0021] 1 First mating flange, 2 Second mating flange, 3 Inner convex snap joint, 4 Inner concave snap joint groove, 5 Inner ring mating protrusion, 6 Inner ring mating groove, 7 Bolt, 8 Nut, 9 Gasket, 10 Positioning groove, 11 Compression spring, 12 Bolt mounting hole, 120 Anti-slip groove, 60 Rubber ring gasket. Detailed Implementation
[0022] 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.
[0023] Example 1: Please refer to Figure 1-5A petrochemical engineering flange with good sealing performance includes a first mating flange 1 and a second mating flange 2. The first mating flange 1 and the second mating flange 2 are installed and fixed to each other by bolts 7 and nuts 8. The inner surface of the first mating flange 1 is provided with an inner convex snap-fit interface 3, and the inner surface of the second mating flange 2 is provided with an inner concave snap-fit groove 4. The outer surface of the inner convex snap-fit interface 3 snaps into the inner surface of the inner concave snap-fit groove 4. The inner surface of the second mating flange 2 is provided with an inner ring mating protrusion 5, and the inner surface of the first mating flange 1 is provided with an inner ring mating groove 6. The outer surface of the inner ring mating protrusion 5 snaps into the inner surface of the inner ring mating groove 6. The first mating flange 1 and the second mating flange 2 have bolt mounting holes 12 on their surfaces. The outer surface of the bolt 7 is inserted and installed along the bolt mounting holes 12. The outer surface of the bolt mounting holes 12 of the first mating flange 1 has a positioning groove 10, and a compression spring 11 is filled in the positioning groove 10. By adopting a flange mating structure with concave and convex joints, a concave and convex interlocking connection can be achieved, which improves the blocking sealing performance. After the pipe is fixed to the outside with bolts and nuts, the inner end is equipped with a compression spring to squeeze the bolt, which generates pressure on the bolt and will not rotate or slip. With the help of the external anti-slip groove, the nut installation is more tight and secure, which improves the sealing performance for long-term use.
[0024] A washer 9 is fitted onto the outer end surface of the bolt 7. The washer 9 is a steel ring washer. The inner surface of the washer 9 is pressed against the outer surface of the compression spring 11. The compression spring 11 is compressed and contracted into the inner end of the positioning groove 10 of the first mating flange 1. The compressible compression spring 11 presses the bolt 7 in the opposite direction. After it is locked, it has an outward pressing force. It can compress stably and is not easy to cause it to rotate and slip. The bolt 7 is not easy to slip when the compression top is close to the rear.
[0025] The second mating flange 2 has an anti-slip groove 120 on the outer surface of the bolt mounting holes 12. The anti-slip groove 120 adopts an inclined groove structure, which is evenly distributed on the outer surface of the bolt mounting holes 12 of the second mating flange 2. After the nut 8 is tightened, it can fit against the surface of the anti-slip groove 120. After tightening, it increases the friction and is not easy to strip the threads. The installation is stable and the sealing performance is high during long-term use.
[0026] A rubber ring gasket 60 is installed on the inner surface of the inner ring mating groove 6 of the first mating flange 1. During installation, the first mating flange 1 and the second mating flange 2 fit together, and the outer surface of the inner ring mating protrusion 5 is engaged with the inner surface of the inner ring mating groove 6. The outer surface of the inner protruding snap-fit interface 3 of the first mating flange 1 is tightly fitted with the inner surface of the inner concave snap-fit groove 4 of the second mating flange 2. They can engage with each other, and after locking, the inner ring mating protrusion 5 is squeezed into the inner ring mating groove 6, which can squeeze and tighten the rubber ring gasket 60, thus achieving a sealing fit, improving the sealing performance, and enhancing the blocking sealing performance.
[0027] A washer 9 is fitted onto the outer end surface of the bolt 7. The washer 9 is a steel ring washer. When the bolt 7 is tightened during installation, the inner surface of the washer 9 is pressed against the outer surface of the compression spring 11. The compression spring 11 is compressed and retracted into the inner end of the positioning groove 10 of the first mating flange 1. The compressible compression spring 11 can press the bolt 7 in the opposite direction. The compression spring 11 presses the bolt 7 outward. After the bolt 7 is tightened, it has an outward compressive force, which can compress stably and is not easy to cause it to rotate and slip. The bolt 7 is not easy to slip when the compression is applied to the rear.
[0028] Eight sets of bolt mounting holes 12 are distributed on the outer surfaces of the first mating flange 1 and the second mating flange 2; multiple sets of bolt mounting holes 12 can be used to install multiple bolts 7 and nuts 8, ensuring stable and secure installation.
[0029] The above description is merely a preferred embodiment of this utility model; however, the protection scope of this utility model is not limited thereto. 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 included within the protection scope of this utility model.
Claims
1. A flange for petrochemical engineering with good sealing performance, comprising a first mating flange (1) and a second mating flange (2), characterized in that: The first mating flange (1) and the second mating flange (2) are installed and fixed to each other by bolts (7) and nuts (8). The inner surface of the first mating flange (1) is provided with an inner protruding snap-fit interface (3), and the inner surface of the second mating flange (2) is provided with an inner concave snap-fit groove (4). The outer surface of the inner protruding snap-fit interface (3) is snapped into the inner surface of the inner concave snap-fit groove (4). The inner surface of the second mating flange (2) is provided with an inner ring mating protrusion (5). The inner surface of the first mating flange (1) is provided with an inner ring mating protrusion (5). The surface is provided with an inner ring mating groove (6), and the outer surface of the inner ring mating protrusion (5) is engaged with the inner surface of the inner ring mating groove (6). The surfaces of the first mating flange (1) and the second mating flange (2) are provided with bolt mounting holes (12). The outer surface of the bolt (7) is inserted and installed along the bolt mounting hole (12). The outer surface of the bolt mounting hole (12) of the first mating flange (1) is provided with a positioning groove (10), and the positioning groove (10) is filled with a compression spring (11).
2. The petrochemical engineering flange with good sealing performance according to claim 1, characterized in that: A washer (9) is fitted onto the outer end surface of the bolt (7). The washer (9) is a steel ring washer. The inner surface of the washer (9) is pressed against the outer surface of the compression spring (11). The compression spring (11) is compressed and contracted into the inner end of the positioning groove (10) of the first mating flange (1).
3. The petrochemical engineering flange with good sealing performance according to claim 1, characterized in that: The second mating flange (2) has an anti-slip groove (120) on its outer surface at the bolt mounting hole (12).
4. The petrochemical engineering flange with good sealing performance according to claim 3, characterized in that: The anti-slip groove (120) adopts an inclined groove structure, which is evenly distributed on the outer surface of the bolt mounting holes (12) of the second mating flange (2).
5. The petrochemical engineering flange with good sealing performance according to claim 1, characterized in that: The inner surface of the inner ring mating groove (6) of the first mating flange (1) is filled with a rubber ring gasket (60).
6. The petrochemical engineering flange with good sealing performance according to claim 1, characterized in that: The eight sets of bolt mounting holes (12) are distributed on the outer surfaces of the first mating flange (1) and the second mating flange (2).
7. The petrochemical engineering flange with good sealing performance according to claim 1, characterized in that: The outer surface of the inner protruding snap-fit interface (3) of the first mating flange (1) is tightly attached to the inner surface of the inner concave snap-fit groove (4) of the second mating flange (2).