An 8-shaped blind plate flange

Abstract

The utility model discloses a kind of 8 blind plate flanges, it is related to pipeline connection technical field.The utility model includes material end, blind plate end and connecting portion, connecting portion is connected between blind plate end and material end, strip-shaped shaft hole is opened on connecting portion along length direction, the length direction of strip-shaped shaft hole is arranged along the center line direction of material end and blind plate end, connecting portion both sides are integrally provided with outer convex part, two outer convex parts and connecting portion are in the shape of cross distribution.The utility model is designed through the strip-shaped shaft hole on connecting portion, gives flange the freedom of being able to be translated along pipeline radial before rotating switch, to remove the traditional pure rotation tangent mode, innovation is the compound motion mode of translation adjustment and rotating switch, can optimize operating space and efficiency, and can reduce the scraping wear of seal in switching process, protects core sealing component, prolongs the valve life.

Description

Technical Field

[0001] This utility model belongs to the field of pipeline connection technology, and in particular relates to an 8-shaped blind flange. Background Technology

[0002] Figure-8 blind flanges are key components in industrial piping systems for reliable shut-off, connection, or flow path switching. A typical figure-8 blind flange structure usually includes a solid blind flange end, a feed end with a central through-hole, and a connection between the two. Taking a blind valve as an example, the standard operating procedure is as follows: The connecting part has a fixed circular shaft hole, which is directly fitted onto one of the locking bolts, allowing the entire valve core to rotate around this bolt as an axis. When switching states is required, all locking bolts are loosened simultaneously, and the two flanges move in opposite directions under the drive of an external mechanism, creating a certain gap. The operator rotates the valve core about 180 degrees to achieve position interchange. After rotation, the positioning pin on the flange end face holds the side plane of the connecting plate for positioning. Finally, all locking bolts are tightened again to compress the seal.

[0003] Despite its wide application, this structure has the following inherent drawbacks in terms of the kinematic path of switching actions, long-term reliability, and manufacturing precision: 1. Switching action path can easily lead to damage to the sealing pair: Because the existing valve core has a fixed shaft hole, it can only perform a pure rotational movement with the locking bolt as the center during switching. This means that the entire outer edge of the valve core, especially the edges of the thicker blind plate and feed plate, moves in a tangential arc during the process of moving in and out between the two flange sealing surfaces. This causes the edge of the valve core to stick to and scrape the metal sealing surface or soft sealing gasket. After long-term and frequent operation, the scraping will inevitably cause scratches on the sealing surface or wear on the gasket, becoming the main cause of internal leakage of the medium, increasing maintenance costs and downtime risks.

[0004] 2. The terminal positioning method is crude and has poor long-term stability: The current positioning relies entirely on the sliding contact and friction between the end face of the positioning pin and the side plane of the connecting plate. This method has two problems: Insufficient precision: Planar contact cannot achieve precise angular positioning, resulting in slight deviations that may affect the uniform distribution of sealing and clamping force.

[0005] Lack of reliable feedback: After the contact surface wears down, the positioning becomes loose. Operators can only judge whether it is in place by visual means, which lacks reliable mechanical feedback and poses a safety hazard of misjudging the status.

[0006] 3. Difficulty in controlling the manufacturing precision of the valve core assembly affects the consistency of sealing: The sealing performance of the valve core is highly dependent on key dimensions such as the parallelism and center distance between the blind plate and the feed plate. Currently, the connecting plate and the two end plates are mostly welded. However, the existing connecting plate structure lacks a high-precision internal positioning reference. Welding relies on manual alignment, which is easily affected by thermal deformation, resulting in large dimensional dispersion of the finished product and affecting the quality and reliability of batch products. Summary of the Invention

[0007] The purpose of this utility model is to provide an 8-shaped blind flange. Through the design of the strip-shaped shaft hole on the connection part, the flange is given the freedom to translate radially along the pipeline before rotation switching. This transforms the traditional pure rotational tangential movement mode into a composite motion mode of translational adjustment and rotation switching, which can optimize the operating space and efficiency, reduce the scratching and wear of the seal during the switching process, protect the core sealing components, and extend the valve life.

[0008] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model is an 8-shaped blind flange, including a material passage end, a blind flange end, and a connecting part; The connecting part is connected between the blind plate end and the feed end. A strip-shaped shaft hole is provided on the connecting part along the length direction. The length direction of the strip-shaped shaft hole is arranged along the center line connecting the feed end and the blind plate end. Both sides of the connecting part are integrally provided with outward protrusions, and the two outward protrusions and the connecting part are distributed in a cross shape. The outward protrusions are provided with strip-shaped pin holes that extend to the connecting part. The strip-shaped pin holes are distributed perpendicularly to the strip-shaped shaft holes and are not connected to each other.

[0009] Furthermore, both the feed end and the blind plate end are provided with embedding openings on their peripheral sides, and the two ends of the connecting part are respectively spaced within the embedding openings and welded and fixed.

[0010] Furthermore, both the strip-shaped shaft hole and the strip-shaped pin hole have an oblong hole structure.

[0011] Furthermore, sealing ring grooves are provided at the edges of both the feed end and the blind plate end.

[0012] Furthermore, the thickness of the protruding portion is the same as the thickness of the connecting portion, and the thickness of the connecting portion is less than the thickness of the material passage end and the blind plate end.

[0013] This utility model has the following beneficial effects: 1. This utility model, through the design of the strip-shaped shaft hole on the connecting part, gives the flange the freedom to translate radially along the pipeline before rotation switching, thereby innovating the traditional pure rotational tangential movement mode into a composite motion mode of translational adjustment and rotation switching. This can optimize the operating space and efficiency, and reduce the scraping and wear on the seal during the switching process, protect the core sealing components, and extend the valve life.

[0014] 2. This utility model provides protrusions on both sides of the connecting plate and provides strip-shaped pin holes perpendicular to the strip-shaped shaft holes. When rotated to the working position, the positioning pin can be accurately inserted into these pin holes. This pin hole fit achieves rigid, gapless circumferential angular locking, fixing the final working angle of the valve core at the theoretical design position, ensuring that the sealing surface is absolutely aligned under force, and achieving rigid angular positioning.

[0015] 3. This utility model can form a cross-shaped structure by integrating the connecting plate and the two outward protrusions on both sides. It can be formed by single precision cutting, resulting in a robust structure, simple process, and controllable cost. At the same time, a strip-shaped adjustment hole and two strip-shaped positioning pin holes on the connecting plate, together with the embedding holes on the end plates, form a self-aligning precision positioning system. This facilitates the quick and accurate fixing of the blind plate end, the material passage end, and the connecting part in the designed position in three-dimensional space before welding. This fundamentally ensures the dimensional accuracy and consistency after welding, laying a solid foundation for the overall sealing reliability of the blind plate valve.

[0016] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments 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.

[0018] Figure 1 This is a structural schematic diagram of a figure-eight blind flange according to the present invention; The attached diagram lists the components represented by each number as follows: 1-Passing end, 2-Blind plate end, 3-Connecting part, 101-Embedded opening, 102-Sealing ring groove, 301-Strip shaft hole, 302-Outer protrusion, 303-Strip pin hole. Detailed Implementation

[0019] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1As shown, this utility model is an 8-shaped blind flange, including a material passage end 1, a blind flange end 2, and a connecting part 3; The connecting part 3 is connected between the blind plate end 2 and the feed end 1. A strip-shaped shaft hole 301 is provided on the connecting part 3 along the length direction. The length direction of the strip-shaped shaft hole 301 is arranged along the center line connecting the feed end 1 and the blind plate end 2. Both sides of the connecting part 3 are integrally provided with an outward protrusion 302. The two outward protrusions 302 and the connecting part 3 are arranged in a cross shape. The outward protrusions 302 are provided with a strip-shaped pin hole 303 extending to the connecting part 3. The strip-shaped pin hole 303 and the strip-shaped shaft hole 301 are perpendicularly distributed and do not communicate with each other.

[0021] Among them, such as Figure 1 As shown, both the feed end 1 and the blind plate end 2 have an insertion port 101 on their circumferential sides, and the two ends of the connecting part 3 are respectively spaced inside the insertion port 101 and welded and fixed.

[0022] Among them, such as Figure 1 As shown, both the strip-shaped shaft hole 301 and the strip-shaped pin hole 303 are oblong hole structures.

[0023] Among them, such as Figure 1 As shown, sealing ring grooves 102 are provided at the edges of both end faces of the feed end 1 and the blind plate end 2.

[0024] Among them, such as Figure 1 As shown, the thickness of the protruding part 302 is the same as the thickness of the connecting part 3, and the thickness of the connecting part 3 is less than the thickness of the material passage end 1 and the blind plate end 2.

[0025] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0026] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An 8-shaped blind flange, comprising a feed end (1), a blind end (2), and a connecting portion (3), characterized in that: The connecting part (3) is connected between the blind plate end (2) and the feed end (1). A strip-shaped shaft hole (301) is provided on the connecting part (3) along the length direction. The length direction of the strip-shaped shaft hole (301) is arranged along the center line connecting the feed end (1) and the blind plate end (2). Both sides of the connecting part (3) are integrally provided with an outward protrusion (302). The two outward protrusions (302) and the connecting part (3) are arranged in a cross shape. The outward protrusions (302) are provided with a strip-shaped pin hole (303) extending to the connecting part (3). The strip-shaped pin hole (303) and the strip-shaped shaft hole (301) are distributed perpendicularly and do not communicate with each other.

2. The figure-eight blind flange according to claim 1, characterized in that, Both the feed end (1) and the blind plate end (2) are provided with an insertion port (101) on their peripheral sides. The two ends of the connecting part (3) are respectively spaced inside the insertion port (101) and welded and fixed.

3. The figure-eight blind flange according to claim 1, characterized in that, Both the strip-shaped shaft hole (301) and the strip-shaped pin hole (303) are waist-shaped hole structures.

4. The figure-eight blind flange according to claim 1, characterized in that, Sealing ring grooves (102) are provided at the edges of both end faces of the feed end (1) and the blind plate end (2).

5. The figure-eight blind flange according to claim 1, characterized in that, The thickness of the protruding part (302) is the same as the thickness of the connecting part (3), and the thickness of the connecting part (3) is less than the thickness of the feed end (1) and the blind plate end (2).

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