A flanged pipe fitting

Abstract

The utility model discloses a kind of flange pipe fittings, belong to pipeline technical field, including pipe fitting main part, the connecting end of pipe fitting main part is integrally formed with flange connecting disc;Flange connecting disc is evenly distributed with several connecting screw holes in circumference;The connecting face side of flange connecting disc is equipped with annular sealing assembly, the annular sealing assembly includes bellows seal ring and toothed nesting ring, the inner ring of toothed nesting ring is equipped with toothed connection structure, for with the toothed connection end of adaptive pipe fitting meshing cooperation.The utility model uses above-mentioned one kind of flange pipe fittings, through the elastic sealing and pressure self-tightening effect of bellows seal ring, the toothed meshing anti-rotation effect of toothed nesting ring and the connecting screw hole of even distribution, high sealing reliability, strong anti-rotation ability, pressure self-adaptive sealing and stable connection strength are realized, effectively improve the stability and security of pipeline connection.

Description

Technical Field

[0001] This utility model relates to the field of pipeline technology, and in particular to a flange fitting. Background Technology

[0002] In the field of pipeline engineering, flange fittings are widely used in industries such as chemical, water conservancy, and energy, serving as key components for enabling rapid connection, disassembly, and sealing of pipelines. Existing flange connection structures typically achieve connection through flange fitting and bolt tightening, with their sealing performance primarily relying on the sealing gasket between the flange connection surfaces.

[0003] However, existing technologies have the following shortcomings: traditional sealing gaskets are mostly flat gaskets, which are prone to sealing failure due to insufficient elasticity or uneven fit when affected by pipeline vibration, temperature changes or medium pressure fluctuations, leading to medium leakage; flange connections only rely on bolt friction to resist relative rotation, which is prone to relative rotation of pipe fittings due to slippage of the connection surface under high torque or vibration conditions, affecting the stability of the pipeline system.

[0004] To address the aforementioned issues, there is an urgent need for a flange fitting that combines high sealing reliability, strong anti-rotation capability, and pressure self-adaptive characteristics to improve the stability and safety of pipeline connections. Utility Model Content

[0005] The purpose of this utility model is to provide a flange fitting to solve the above-mentioned problems.

[0006] This utility model provides a flange pipe fitting, including a pipe fitting body, wherein the connecting end of the pipe fitting body is integrally formed with a flange connecting plate;

[0007] The flange connecting plate has a number of connecting screw holes evenly distributed circumferentially;

[0008] The flange connecting plate is equipped with an annular sealing assembly on the connecting surface side. The annular sealing assembly includes a corrugated sealing ring and a toothed nested ring. The corrugated sealing ring is coaxially sleeved on the outside of the toothed nested ring, and one end of the corrugated sealing ring is fixedly connected to the flange connecting plate. Its outer surface abuts and seals with the matching pipe fitting.

[0009] A pressure flow groove is provided between the flange connecting plate and the toothed nested ring;

[0010] The inner ring of the nested toothed ring is provided with a toothed connection structure for meshing with the toothed connection end of the fitting.

[0011] Preferably, in the above-mentioned flange fitting, the corrugated sealing ring is a metal corrugated sealing ring.

[0012] Preferably, in the above-mentioned flange fitting, the number of connecting bolt holes is 6-8.

[0013] Preferably, in the above-mentioned flange fitting, the pressure flow groove extends circumferentially and penetrates the radial side of the flange connecting plate.

[0014] Preferably, in the above-mentioned flange fitting, the toothed connection structure is evenly arranged on the inner ring of the toothed nested ring to resist the force of relative rotation after the fitting is connected.

[0015] Therefore, this utility model adopts the aforementioned flange fitting. In the annular sealing assembly, the corrugated sealing ring can adapt to minor deformations or vibrations of the flange connection surface, ensuring continuous sealing. Simultaneously, the metal corrugated sealing ring can withstand high temperatures, high pressures, and corrosive media, significantly broadening the applicable operating conditions and solving the problem of easy aging and failure of traditional gaskets. The toothed connection structure of the inner ring of the toothed nested ring meshes with the toothed connection end of the fitting, forming a mechanical locking structure. Through toothed surface engagement, it directly resists relative rotational forces, improving stability compared to the traditional bolt friction-based anti-rotation method, effectively preventing loosening under high torque or vibration conditions. The pressure flow groove between the flange connecting plate and the toothed nested ring extends circumferentially and penetrates the radial side, allowing the medium pressure in the pipeline to act on the inner side of the corrugated sealing ring through the flow groove. The 6-8 evenly distributed bolt holes circumferentially on the flange connecting plate ensure even distribution of bolt tightening force on the flange surface, avoiding flange deformation caused by localized stress concentration, further guaranteeing the sealing assembly's fit stability.

[0016] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the flange pipe fitting of this utility model;

[0018] Figure 2 This is a schematic cross-sectional view of an embodiment of the flange pipe fitting of this utility model. Detailed Implementation

[0019] To better understand the above technical solutions, a detailed description of the solutions will be provided below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0020] The terminology used in the embodiments of this utility model is for the purpose of describing particular embodiments only and is not intended to limit the utility model. The singular forms “a,” “the,” and “the” used in the embodiments of this utility model and the appended claims are also intended to include the plural forms, and “multiple” generally includes at least two unless the context clearly indicates otherwise.

[0021] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0022] This utility model provides a flange pipe fitting, including a pipe fitting body 1, wherein a flange connecting plate 2 is integrally formed at the connecting end of the pipe fitting body 1;

[0023] The flange connecting plate 2 has several connecting bolt holes 3 evenly distributed along its circumference; the connecting surface of the flange connecting plate 2 is equipped with an annular sealing assembly 4, which includes a corrugated sealing ring 41 and a toothed nested ring 42. The corrugated sealing ring 41 is coaxially sleeved on the outside of the toothed nested ring 42, and one end of the corrugated sealing ring 41 is fixedly connected to the flange connecting plate 2, and its outer surface abuts and seals against the adapting pipe fitting; a pressure flow groove 5 is provided between the flange connecting plate 2 and the toothed nested ring 42; the inner ring of the toothed nested ring 42 is provided with a toothed connecting structure 421 for meshing with the toothed connecting end of the adapting pipe fitting.

[0024] The corrugated sealing ring 41 is a metal corrugated sealing ring; the number of connecting screw holes 3 is 6-8; the pressure flow groove 5 extends circumferentially and penetrates the radial side of the flange connecting plate 2; the toothed connection structure 421 is evenly arranged to the inner ring of the toothed nested ring 42 to resist the force of relative rotation after the pipe fitting is connected.

[0025] Working Principle: The toothed connection end of the fitting is inserted into the inner ring of the nested toothed ring, allowing the toothed structures of both to precisely mesh. Circumferential positioning is achieved through tooth surface engagement, directly restricting the relative rotation of the fitting and the flange connection plate, forming an anti-rotation foundation. Bolts are used to fasten the flange fitting to the flange of the fitting through the connecting bolt holes 3 on the flange connection plate. During tightening, the bellows sealing ring 41 is compressed, its bellows structure undergoes elastic deformation, generating axial preload, causing both ends of the bellows sealing ring to tightly abut against the sealing surfaces of the flange connection plate 2 and the fitting, forming an initial seal. After the medium is introduced into the pipeline, the medium pressure is transmitted to the bellows sealing ring through the pressure flow groove 5. According to fluid mechanics principles, the medium pressure generates a radially outward thrust on the bellows sealing ring 41, forcing it to further conform to the sealing surface. The higher the pressure, the greater the contact pressure, significantly improving the sealing reliability under high-pressure conditions. When the pipeline is subjected to vibration or temperature changes and undergoes slight deformation, the corrugated structure of the corrugated sealing ring 41 can compensate for the deformation through elastic reset, maintaining the continuous fit of the sealing surface; at the same time, the meshing state of the toothed connection structure remains stable, continuously resisting the rotational force, and ensuring the stability of the entire connection structure under dynamic working conditions.

[0026] Therefore, this utility model adopts the aforementioned flange fitting. In the annular sealing assembly, the corrugated sealing ring can adapt to minor deformations or vibrations of the flange connection surface, ensuring continuous sealing. Simultaneously, the metal corrugated sealing ring can withstand high temperatures, high pressures, and corrosive media, significantly broadening the applicable operating conditions and solving the problem of easy aging and failure of traditional gaskets. The toothed connection structure of the inner ring of the toothed nested ring meshes with the toothed connection end of the fitting, forming a mechanical locking structure. Through toothed surface engagement, it directly resists relative rotational forces, improving stability compared to the traditional bolt friction-based anti-rotation method, effectively preventing loosening under high torque or vibration conditions. The pressure flow groove between the flange connecting plate and the toothed nested ring extends circumferentially and penetrates the radial side, allowing the medium pressure in the pipeline to act on the inner side of the corrugated sealing ring through the flow groove. The 6-8 evenly distributed bolt holes circumferentially on the flange connecting plate ensure even distribution of bolt tightening force on the flange surface, avoiding flange deformation caused by localized stress concentration, further guaranteeing the sealing assembly's fit stability.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A flange pipe fitting, characterized in that, Includes a pipe fitting body (1), and the connecting end of the pipe fitting body (1) is integrally formed with a flange connecting plate (2); The flange connecting plate (2) has several connecting screw holes (3) evenly distributed along its circumference; The flange connecting plate (2) is equipped with an annular sealing assembly (4) on the connecting surface side. The annular sealing assembly (4) includes a corrugated sealing ring (41) and a toothed nested ring (42). The corrugated sealing ring (41) is coaxially sleeved on the outside of the toothed nested ring (42), and one end of the corrugated sealing ring (41) is fixedly connected to the flange connecting plate (2), and its outer surface abuts and seals with the matching pipe fitting. A pressure flow groove (5) is provided between the flange connecting plate (2) and the toothed nested ring (42); The inner ring of the toothed nested ring (42) is provided with a toothed connection structure (421) for meshing with the toothed connection end of the fitting.

2. A flange fitting according to claim 1, characterized in that, The corrugated sealing ring (41) is a metal corrugated sealing ring.

3. A flange fitting according to claim 1, characterized in that, The number of connecting screw holes (3) is 6-8.

4. A flange fitting according to claim 1, characterized in that, The pressure flow groove (5) extends circumferentially and penetrates the radial side of the flange connection plate (2).

5. A flange fitting according to claim 1, characterized in that, The toothed connection structure (421) is evenly arranged on the inner ring of the toothed nested ring (42) to resist the force of relative rotation after the pipe fitting is connected.

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