A high-pressure flange

Abstract

The utility model discloses a high pressure flange, by flange, plugboard, gland, multiple pre -tightening subassembly composition, the plugboard is annular structure, is located between the sealing surface of two flanges, and the inner diameter of plugboard is same with the inner diameter of flange, and the outer diameter is same with the outer diameter of flange end part, and the inner peripheral position of plugboard both sides end face is established respectively having annular sealing groove, and the sealing groove is placed sealing ring, every gland is established at corresponding flange's outer step surface place and is matched with the outer step surface, and every gland sets up multiple through -holes along the circumference, multiple pre -tightening subassembly are set up between two glands, and every pre -tightening subassembly includes stud bolt and respectively located double -nut of stud bolt both ends, and stud bolt passes through the through -hole of two glands and is pre -tightened through double -nut respectively, and two flanges and plugboard are connected as one sealing whole. The utility model discloses under the high pressure working condition to the sealing effect of pipeline is good, and life is high, and dismounts maintenance is convenient, and maintenance cost is low.

Description

Technical Field

[0001] This utility model belongs to the field of high-pressure flange technology, and in particular relates to a high-pressure flange. Background Technology

[0002] In high-pressure fluid transmission systems across industries such as machinery, petroleum, chemical, and energy, high-pressure flanges play a crucial role as key connecting components. Under high-pressure conditions, current flanges are prone to leakage due to pressure fluctuations and temperature changes, affecting the safety and stability of the system. To address this issue, it is necessary to develop a flange structure that can provide stable and reliable sealing performance under high-pressure conditions.

[0003] High-pressure flanges are mechanical components used for connecting high-pressure pipelines, ensuring a tight connection and smooth fluid flow. There are many types of high-pressure flanges, classified by connection method, including: welded flanges, threaded flanges, loose flanges, socket weld flanges, and butt weld flanges, among others. Of all connection methods, only welding can meet the requirements for high temperature resistance, high pressure resistance, and large diameter. Welded high-pressure flanges are a common type of flange, widely used in applications requiring high-strength connections and good sealing performance. They form a permanent connection by directly welding the flange to the pipeline. The main advantages of welded flanges are: high connection strength, good sealing performance, even flange stress, and smooth fluid flow. However, the main disadvantage of welded flanges is that they are not disassembled, making maintenance very inconvenient.

[0004] Therefore, current high-pressure flanges suffer from poor sealing, short service life, inconvenient maintenance and replacement, and significant safety hazards. Utility Model Content

[0005] To address the problems of existing technologies, this utility model provides a high-pressure flange that offers excellent sealing performance for pipelines under high-pressure conditions, long service life, convenient disassembly and maintenance, and low maintenance costs. The high-pressure flange utilizes a double-nut pre-tightening structure, compatible with various pre-tightening methods such as hydraulic pullers, torque wrenches, and hydraulic wrenches. The double-nut pre-tightening mechanism ensures good pre-tightening effect, preventing loosening of the pre-tightening nuts and extending the service life of the high-pressure flange. The multi-functional insert plate uses end-face sealing in conjunction with a dedicated sealing ring, reserving ample space for a pressure relief groove. This groove reduces the risk of leakage and improves safety. This invention solves the problems of poor sealing performance, inconvenient seal maintenance and replacement, difficulty in pre-tightening in space-constrained conditions, uneven pre-tightening leading to leakage, and difficulties in troubleshooting and posing significant safety hazards after seal failure.

[0006] This utility model is implemented as follows: a high-pressure flange consists of a flange, a slide plate, a gland, and multiple pre-tightening components. The slide plate has an annular structure and is located between the sealing surfaces of two flanges. The inner diameter of the slide plate is the same as the inner diameter of the flange, and the outer diameter is the same as the outer diameter of the flange end. Annular sealing grooves are respectively opened at the inner circumferential positions of the two end faces of the slide plate, and sealing rings are placed in the sealing grooves. Each gland is set at the outer stepped surface of the corresponding flange and matches the outer stepped surface. Each gland has multiple through holes along the circumference. Multiple pre-tightening components are arranged between two glands. Each pre-tightening component includes a double-ended stud and two nuts located at both ends of the double-ended stud. The double-ended stud passes through the through holes of the two glands and is pre-tightened by the double nuts, connecting the two flanges and the slide plate into a sealed whole.

[0007] In the above technical solution, preferably, the two end faces of the insert plate are respectively provided with pressure relief grooves and pressure relief holes that connect the pressure relief grooves to the outside.

[0008] In the above technical solution, preferably, the width of the sealing groove is 25mm or 18mm.

[0009] In the above technical solution, preferably, the outer peripheral surface of the insert plate is provided with a plurality of lifting holes.

[0010] In the above technical solution, preferably, the double nut consists of a pre-tightening nut and a lock nut, with the pre-tightening nut located on the inner side and the lock nut located on the outer side.

[0011] In the above technical solution, preferably, a plurality of lifting holes are provided on the outer peripheral surface of the flange outer step.

[0012] In the above technical solution, preferably, the inner corner of the outer stepped surface of the flange is chamfered, and the corresponding corner of the gland is also chamfered.

[0013] In the above technical solution, preferably, the outer peripheral surface of the pressure cap is provided with a plurality of lifting holes.

[0014] In the above technical solution, preferably, the plurality of through holes are evenly distributed on the gland.

[0015] The advantages and positive effects of this utility model are:

[0016] 1. This utility model discloses a pre-tightened high-pressure flange, which combines a multi-bolt evenly distributed pre-tightening structure, a multi-functional insert plate sealing structure, and a double-nut anti-loosening structure. Through a strong and uniform pre-tightening force, it achieves a tight seal between the flange, gland, and insert plate. Compared to other high-pressure flange structures, it is more reliable, ensuring the sealing performance of the high-pressure flange and improving equipment performance. This utility model solves the problems of poor sealing performance, short service life, cumbersome installation and maintenance, significant safety hazards, and difficult production of traditional high-pressure flanges, as well as the inconvenience of using bolts to access the insert plate. It is highly versatile, widely applicable, simple to manufacture, and low in cost.

[0017] 2. The insert plate of this utility model uses an end face seal combined with a special sealing ring to improve the sealing performance. After the sealing ring ages or is damaged, the insert plate can be pulled out separately with the help of a pre-tightening tool, making seal replacement convenient and installation and maintenance simple. The multi-bolt evenly distributed pre-tightening structure solves the problem of poor sealing performance. The insert plate uses pressure relief grooves and pressure relief holes to release pressure in time when the seal fails, solving the problem of high safety hazards. The insert plate has multiple lifting holes, which solves the problem of inconvenient replacement of high-pressure flange sealing rings.

[0018] 3. The gland design of this utility model, combined with a multi-bolt structure, ensures more uniform stress distribution on the high-pressure flange and finer-graded pre-tightening force, achieving precise pre-tightening. Multiple pre-tightening methods allow the high-pressure flange to meet pre-tightening requirements in various installation environments and operating conditions. Furthermore, different types of pre-tightening methods can be selected for flanges of different grades based on bolt size and pre-tightening force requirements, effectively solving installation problems caused by space constraints and facilitating maintenance and pre-tightening.

[0019] 4. The pre-tightened high-pressure flange of this utility model adopts a chamfered transition structure design at corresponding positions of the flange and the gland, which greatly reduces the stress concentration of the flange and extends the service life of the high-pressure flange. Lifting holes are designed at reasonable positions on the flange, the insert plate and the gland respectively, which can meet almost all usage scenarios, facilitates lifting, and can lift ultra-large flanges to connect ultra-large diameter pipelines, which is beneficial to pipeline installation. Attached Figure Description

[0020] The technical solutions of the embodiments of this application will be further described in detail below with reference to the accompanying drawings. However, it should be understood that these drawings are designed for illustrative purposes only and are not intended to limit the scope of this application. In addition, unless otherwise specified, these drawings are only intended to conceptually illustrate the structural construction described herein and are not necessarily drawn to scale.

[0021] Figure 1 This is a structural schematic diagram of the high-pressure flange of this utility model;

[0022] Figure 2 This is a schematic diagram of the insert plate of this utility model;

[0023] Figure 3 This is a cross-sectional schematic diagram of the sealing ring of this utility model;

[0024] Figure 4 This is a structural schematic diagram of the single-sided high-pressure flange of this utility model.

[0025] In the diagram: 1. Flange; 11. Lifting Hole II; 2. Insert plate; 21. Sealing groove; 22. Sealing ring; 23. Pressure relief groove; 24. Pressure relief hole; 25. Lifting Hole I; 3. Gland; 31. Lifting Hole III; 4. Double-ended stud; 5. Preload nut; 6. Locking nut. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the following embodiments are provided, and detailed descriptions are given below in conjunction with the accompanying drawings:

[0027] In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "one," "two," "three," "four," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection," "joining," "installation," and "assembly" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] Please see Figures 1-3This utility model provides a high-pressure flange, which consists of a flange 1, a slide plate 2, a gland 3, and multiple pre-tightening components. The slide plate 2 is an annular structure located between the sealing surfaces of the two flanges 1. The inner diameter of the slide plate 2 is the same as the inner diameter of the flange 1, and the outer diameter is the same as the outer diameter of the end of the flange 1. Annular sealing grooves 21 are respectively opened at the inner periphery of the two end faces of the slide plate 2, and sealing rings 22 are placed in the sealing grooves 21. Each gland 3 is set at the outer stepped surface of the corresponding flange 1 and matches the outer stepped surface. Each gland 3 has multiple through holes along the circumference. Multiple pre-tightening components are arranged between the two glands 3. Each pre-tightening component includes a double-ended stud 4 and double nuts located at both ends of the double-ended stud 4. The double-ended stud 4 passes through the through holes of the two glands 3 and is pre-tightened by the double nuts, connecting the two flanges 1 and the slide plate 2 into a sealed whole.

[0030] In a preferred embodiment, the two end faces of the insert plate 2 are respectively provided with pressure relief grooves 23 and pressure relief holes 24 connecting the pressure relief grooves 23 to the outside. This allows for timely pressure relief in case of seal failure, effectively reducing safety hazards and solving the problem of significant safety risks.

[0031] In a preferred embodiment, the width of the sealing groove 21 is 25mm or 18mm. The sealing groove 21 for large-diameter high-pressure flanges is 25mm wide, and the sealing groove 21 for small-diameter high-pressure flanges is 18mm wide. When the cross-section of the sealing groove 21 is a double-sided seal, the following can be selected: Figure 3 The shown is a slide-on seal, and the sealing ring 22 has a protrusion on the end face near the flange 1. When the cross-section of the sealing groove 21 is a three-sided seal, a rectangular seal can be selected, which provides good sealing effect, long service life, and stable sealing performance. The position and type of the sealing groove 21 can be selected according to user requirements, which makes the high-pressure flange easier to maintain and allows for easy replacement of the sealing ring 22.

[0032] In a preferred embodiment, the outer circumferential surface of the insert plate 2 is provided with a plurality of lifting holes 25, which facilitates the installation and disassembly of the insert plate 2 and solves the problem of inconvenient replacement of the high-pressure flange sealing ring 22.

[0033] In a preferred embodiment, the double nut consists of a preload nut 5 and a lock nut 6, with the preload nut 5 located on the inner side and the lock nut 6 on the outer side. This double nut structure effectively prevents the nuts from loosening, thus preventing the high-pressure flange bolts from loosening and extending their service life.

[0034] In a preferred embodiment, the outer peripheral surface of the outer step of the flange 1 is provided with multiple lifting holes 11, which facilitates hoisting and allows for the hoisting of ultra-large flange 1 to connect ultra-large diameter pipelines, which is beneficial for pipeline installation.

[0035] In a preferred embodiment, the inner corner of the outer stepped surface of the flange 1 is chamfered, and a corresponding corner of the gland 3 is also chamfered. Both the flange 1 and the gland 3 employ chamfered transitions at corresponding positions to eliminate localized stress concentrations.

[0036] In a preferred embodiment, the outer circumferential surface of the pressure cap 3 is provided with a plurality of lifting holes 31, which facilitates lifting and is beneficial for the installation of the flange 1.

[0037] In a preferred embodiment, the multiple through holes are evenly distributed on the pressure cap 3 to further ensure that the pre-tightening force is evenly distributed.

[0038] The specific installation process of this utility model is as follows:

[0039] When using this high-pressure flange, first assemble flange 1, and do not assemble the lock nut 6 when assembling flange 1.

[0040] First, insert the sealing ring 22 into the insert plate 2 in the correct direction, align the flange 1 and insert plate 2, and put on the gland 3. Insert the double-ended stud 4 into the gland 3 and then tighten the preload nut 5. After assembling the flange 1 of the double-sided pipe, preload it directly using a preload tool. After connecting the flange 1 of the single-sided pipe to the structure that needs to connect the flange 1, preload it using a preload tool (e.g., Figure 4 As shown, during pre-tightening, diagonal pre-tightening is performed sequentially to ensure uniform stress distribution, connecting the two flanges 1 and the insert plate 2 into a sealed unit. After pre-tightening, the anti-loosening nuts 6 are installed, and the entire unit is lifted and welded to the pipeline.

[0041] When a problem occurs in the pipeline and the sealing ring 22 needs to be inspected or replaced, use a regular wrench to remove the lock nut 6, then use a pre-tightening tool to remove the pre-tightening nut 5, remove part of the double-ended stud 4 and the insert plate 2, replace the sealing ring 22 on the insert plate 2, and finally put the insert plate 2 back and align the insert plate 2 and flange 1, then reinstall the double-ended stud 4 and pre-tighten it.

[0042] In addition, it should be noted that the shape of the pressure cap can be selected according to the required preload. When the preload is large, a round pressure cap with a multi-bolt structure is selected, and when the preload is small, a square pressure cap with a four-bolt structure is selected. The nuts are divided into round nuts and hexagonal nuts, which can be selected according to the preload tool and with the help of a conversion sleeve.

[0043] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall fall within the scope of the technical solution of the present utility model.

Claims

1. A high-pressure flange, characterized in that: It consists of flanges, insert plates, glands, and multiple pre-tightening components. The insert plate is an annular structure located between the sealing surfaces of two flanges. The inner diameter of the insert plate is the same as the inner diameter of the flange, and the outer diameter is the same as the outer diameter of the flange end. Annular sealing grooves are respectively opened at the inner circumference of the two end faces of the insert plate, and sealing rings are placed in the sealing grooves. Each gland is set at the outer stepped surface of the corresponding flange and matches the outer stepped surface. Each gland has multiple through holes along its circumference. Multiple pre-tightening components are set between the two glands. Each pre-tightening component includes a double-ended stud and two nuts located at both ends of the double-ended stud. The double-ended stud passes through the through holes of the two glands and is pre-tightened by the double nuts, connecting the two flanges and the insert plate into a sealed whole.

2. The high-pressure flange according to claim 1, characterized in that: The two end faces of the insert plate are respectively provided with pressure relief grooves and pressure relief holes that connect the pressure relief grooves to the outside.

3. The high-pressure flange according to claim 1, characterized in that: The width of the sealing groove is 25mm or 18mm.

4. The high-pressure flange according to claim 1, characterized in that: The outer circumferential surface of the insert plate is provided with multiple lifting holes.

5. The high-pressure flange according to claim 1, characterized in that: The double nut consists of a preload nut and a lock nut, with the preload nut located on the inner side and the lock nut on the outer side.

6. The high-pressure flange according to claim 1, characterized in that: The outer circumferential surface of the flange outer step is provided with multiple lifting holes.

7. The high-pressure flange according to claim 1, characterized in that: The flange has a chamfered transition at the inner corner of the outer stepped surface, and the corresponding gland has a chamfered transition at one corner.

8. The high-pressure flange according to claim 1, characterized in that: The outer circumferential surface of the pressure cap is provided with multiple lifting holes.

9. The high-pressure flange according to claim 1, characterized in that: Multiple through holes are evenly distributed on the gland.

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