A seamless steel pipe with a pressure relief structure

Abstract

The utility model relates to steel pipe technical field, concretely is a seamless steel tube with pressure -relief structure, the rear end fixed setting ring seat of seamless steel pipe body, the inside of ring seat is equipped with annular groove, annular cylinder inserts to the inside of seamless steel pipe body, the rear end fixed setting ring frame of annular cylinder, ring frame inserts to the inside with annular groove screw thread connection of groove, the front end of annular cylinder is flush with the front end of seamless steel pipe body, this structure integrates pressure -relief structure in seamless steel pipe body, through the cooperation of ring frame, locating seat, spring and pressure -relief block, realizes the instantaneous response when water pressure mutation, when pressure exceeds threshold value, pressure -relief block compression spring expands the inside diameter pressure relief, avoids the plastic deformation or burst of steel pipe because of instantaneous overpressure, improves the operation safety of boiler system from the body structure level.

Description

Technical Field

[0001] This utility model relates to the field of steel pipe technology, specifically to a seamless steel pipe with a pressure relief structure. Background Technology

[0002] In the boiler industry, seamless steel pipes, as key components for conveying high-temperature and high-pressure media, often face safety hazards due to sudden increases in internal water pressure. Traditional seamless steel pipes, under high-pressure conditions, often rely on external pressure relief valves or rupture discs for pressure relief. Such structures not only increase system complexity and installation and maintenance costs, but also lag behind pressure surges, easily leading to plastic deformation or even rupture of the steel pipe due to instantaneous overpressure. This severely affects the safety and stability of boiler operation, further shortening equipment lifespan. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] To address the shortcomings of existing technologies, this utility model provides a seamless steel pipe with a pressure relief structure.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, the present invention provides the following technical solution: a seamless steel pipe with a pressure relief structure, comprising a seamless steel pipe body, an annular cylinder and a U-shaped rod, wherein an annular seat is fixedly provided at the rear end of the seamless steel pipe body, an annular groove is provided on the inner side of the annular seat, the annular cylinder is inserted into the interior of the seamless steel pipe body, an annular frame is fixedly provided at the rear end of the annular cylinder, the annular frame is inserted into the annular groove and threadedly connected to the annular groove, and the front end of the annular cylinder is flush with the front end of the seamless steel pipe body;

[0007] Multiple positioning seats are fixedly installed on the inner wall of the ring frame. Each positioning seat has a cavity inside, and multiple springs are installed inside the cavity. Each spring has a pressure relief block at its outer end.

[0008] To facilitate assembly of the annular cylinder within the seamless steel pipe body, the present invention includes the following improvement: multiple grooves are symmetrically arranged on the inner wall of the front end of the annular cylinder, and the two ends of the U-shaped rod are inserted into the grooves and fit tightly against the inner wall of the grooves.

[0009] Furthermore, the improvements of this utility model include that the annular cylinder, the annular frame, and the positioning seat are integrated into one structure, and the seamless steel pipe body and the annular seat are integrated into one structure.

[0010] To reduce the impact force between the water flow and the pressure relief block, the improvement of this utility model is that the pressure relief block has an isosceles trapezoidal structure.

[0011] Furthermore, an improvement of this utility model is that one end of the spring is fixed inside the cavity, and the other end is connected to a pressure relief block.

[0012] To ensure the airtightness between the pressure relief block and the cavity, the improvement of this utility model is that a sealing strip is provided between the periphery of the pressure relief block and the inner wall of the cavity.

[0013] (III) Beneficial Effects

[0014] Compared with the prior art, this utility model provides a seamless steel pipe with a pressure relief structure, which has the following beneficial effects:

[0015] This structure integrates the pressure relief structure into the seamless steel pipe body. Through the cooperation of the ring frame, positioning seat, spring and pressure relief block, it realizes the instantaneous response when the water pressure changes suddenly. When the pressure exceeds the threshold, the pressure relief block compresses the spring to expand the inner diameter to relieve pressure, avoiding plastic deformation or bursting of the steel pipe due to instantaneous overpressure, thus improving the operational safety of the boiler system from the perspective of the main body structure. Attached Figure Description

[0016] Figure 1 This is a first-view perspective three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is a second-view perspective three-dimensional structural diagram of the present invention;

[0018] Figure 3 This utility model Figure 2 Cross-sectional view;

[0019] Figure 4 This utility model Figure 1 Cross-sectional view;

[0020] Figure 5 This is a schematic diagram of the installation structure of the sealing strip in this utility model;

[0021] In the diagram: 1. Seamless steel pipe body; 2. Annular cylinder; 3. Annular frame; 4. Annular seat; 5. Annular groove; 6. Groove; 7. U-shaped rod; 8. Positioning seat; 9. Cavity; 10. Spring; 11. Pressure relief block; 12. Sealing strip. 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] Please see Figures 1-5This utility model provides a seamless steel pipe with a pressure relief structure, including a seamless steel pipe body 1, an annular cylinder 2 and a U-shaped rod 7. An annular seat 4 is fixedly provided at the rear end of the seamless steel pipe body 1. An annular groove 5 is provided on the inner side of the annular seat 4. The annular cylinder 2 is inserted into the seamless steel pipe body 1. An annular frame 3 is fixedly provided at the rear end of the annular cylinder 2. The annular frame 3 is inserted into the annular groove 5 and threadedly connected to the annular groove 5. The front end of the annular cylinder 2 is flush with the front end of the seamless steel pipe body 1.

[0024] Multiple positioning seats 8 are fixedly installed on the inner wall of the ring frame 3. The positioning seats 8 have cavities 9 inside, and multiple springs 10 are installed inside the cavities 9. The outer ends of the springs 10 are provided with pressure relief blocks 11.

[0025] Multiple grooves 6 are symmetrically arranged on the inner wall of the front end of the annular cylinder 2. The two ends of the U-shaped rod 7 are inserted into the grooves 6 and fit tightly against the inner wall of the grooves 6.

[0026] The annular cylinder 2, the annular frame 3, and the positioning seat 8 are integrated structures, and the seamless steel pipe body 1 and the annular seat 4 are integrated structures.

[0027] The pressure relief block 11 has an isosceles trapezoidal structure.

[0028] One end of the spring 10 is fixed inside the cavity 9, and the other end is connected to the pressure relief block 11.

[0029] Assembly process: First, insert the annular cylinder 2 into the seamless steel pipe body 1, so that the front end of the annular cylinder 2 is flush with the front end of the seamless steel pipe body 1.

[0030] The annular frame 3 at the rear end of the annular cylinder 2 is inserted into the annular groove 5 of the annular seat 4 at the rear end of the seamless steel pipe body 1, and is fixed by threaded connection.

[0031] During assembly, the U-shaped rod 7 is inserted into the groove 6 on the inner wall of the front end of the annular cylinder 2 to assist in the positioning and fixation of the annular cylinder 2 within the seamless steel pipe body 1, ensuring that the annular cylinder 2 and the seamless steel pipe body 1 are coaxial.

[0032] The positioning seat 8 on the inner wall of the ring frame 3 has a cavity 9 inside. A spring 10 is installed in the cavity 9. The outer end of the spring 10 is connected to a pressure relief block 11. The periphery of the pressure relief block 11 is sealed with the inner wall of the cavity 9 by a sealing strip 12 to ensure that the medium will not leak from the gap between the pressure relief block 11 and the cavity 9 under normal working conditions.

[0033] Pressure relief working principle: When the water pressure inside the seamless steel pipe body 1 is normal, the pressure relief block 11 maintains its initial position under the support of the spring 10, and together with the inner wall of the annular cylinder 2, it forms a complete flow channel.

[0034] If the internal water pressure suddenly increases, the impact force of the water flow acts on the pressure relief block 11 of the isosceles trapezoidal structure, pushing it to compress the spring 10 inside the cavity 9. At this time, the inner diameter of the annular cylinder 2 expands due to the inward contraction of the pressure relief block 11, thereby releasing some pressure and avoiding overpressure inside the seamless steel pipe body 1.

[0035] A sealing strip 12 is provided between the periphery of the pressure relief block 11 and the inner wall of the cavity 9.

[0036] Once the water pressure stabilizes, the spring 10 resets, pushing the pressure relief block 11 back to its initial position, resealing the cavity 9, and restoring the normal flow of the steel pipe.

[0037] The annular cylinder 2, the annular frame 3, and the positioning seat 8 are integrated structures, as are the seamless steel pipe body 1 and the annular seat 4, which reduces the assembly gap of parts and enhances the overall strength.

[0038] The fit between the U-shaped rod 7 and the groove 6 facilitates the disassembly and maintenance of the annular cylinder 2, allowing for repairs to be completed without additional tools, thus reducing installation and maintenance costs.

[0039] The isosceles trapezoidal pressure relief block 11 is designed to slow down the impact of water flow and reduce energy loss during the pressure relief process; the sealing strip 12 around the pressure relief block 11 ensures the sealing between the cavity 9 and the inside of the steel pipe to prevent media leakage.

[0040] The elastic reset mechanism of spring 10 allows pressure relief block 11 to quickly return to its original position after the pressure stabilizes, ensuring the stability of the steel pipe's flow performance and extending the service life of each component.

[0041] This structure can automatically adjust the displacement of the pressure relief block 11 according to the real-time water pressure to achieve dynamic pressure relief without manual intervention or additional control system. It is suitable for scenarios where water pressure fluctuates frequently during boiler operation and effectively solves the problems of slow response and insufficient accuracy of traditional pressure relief methods.

[0042] Sealing strip 12 material: Fluororubber (FKM) or polytetrafluoroethylene (PTFE). Selection criteria:

[0043] Fluororubber has excellent high temperature resistance (temperature range -20℃ to 200℃), high pressure resistance and chemical corrosion resistance. It can maintain its elasticity in the high temperature and high pressure water flow environment of boilers and prevent media leakage.

[0044] PTFE (polytetrafluoroethylene) has a low coefficient of friction and is extremely corrosion resistant, making it suitable for dynamic sealing scenarios. It can reduce wear during the reciprocating motion of the pressure relief block 11, while also meeting the requirements for conveying food-grade or high-purity media (if the boiler medium has special requirements).

[0045] Spring 10 material: 50CrVA spring 10 steel or nickel-based alloy (such as Inconel 718). Selection criteria:

[0046] 50CrVA spring steel has high strength, high toughness and good fatigue resistance. It can withstand high temperatures up to 300℃ and can maintain stable elastic recovery ability under high pressure water flow impact. It is suitable for conventional boiler operating conditions.

[0047] Nickel-based alloys (such as Inconel 718) can maintain excellent mechanical properties in high-temperature (above 650°C) and highly corrosive environments, making them suitable for supercritical boilers or environments where the medium contains highly corrosive components, thus preventing fatigue fracture of spring 10 due to long-term alternating loads.

[0048] Pressure relief block 11 material: 316L stainless steel or titanium alloy (such as TC4). Selection criteria:

[0049] 316L stainless steel contains molybdenum, which makes it highly resistant to acid and alkali corrosion and chloride ion erosion. It has high strength (tensile strength ≥480MPa), and its isosceles trapezoidal structure is not easily deformed under the impact of high-pressure water flow. Its smooth surface can reduce water flow resistance.

[0050] Titanium alloy (TC4) has low density and high strength (tensile strength ≥895MPa), and its corrosion resistance is better than that of stainless steel. It is especially suitable for seawater or high-salt media environments, which can prevent the pressure relief block 11 from being worn or corroded by long-term scouring, and ensure the sensitivity of the pressure relief action.

[0051] Annular cylinder 2 is made of 42CrMo alloy structural steel or 316 stainless steel.

[0052] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0053] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0054] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A seamless steel pipe with a pressure relief structure, comprising a seamless steel pipe body (1), an annular cylinder (2), and a U-shaped rod (7), characterized in that: The rear end of the seamless steel pipe body (1) is fixedly provided with an annular seat (4), the inner side of the annular seat (4) is provided with an annular groove (5), the annular cylinder (2) is inserted into the seamless steel pipe body (1), the rear end of the annular cylinder (2) is fixedly provided with an annular frame (3), the annular frame (3) is inserted into the annular groove (5) and threadedly connected to the annular groove (5), and the front end of the annular cylinder (2) is flush with the front end of the seamless steel pipe body (1). Multiple positioning seats (8) are fixedly installed on the inner wall of the ring frame (3). The positioning seats (8) have cavities (9) inside, and multiple springs (10) are installed inside the cavities (9). The outer ends of the springs (10) are provided with pressure relief blocks (11).

2. A seamless steel pipe with a pressure relief structure according to claim 1, characterized in that: Multiple grooves (6) are symmetrically arranged on the inner wall of the front end of the annular cylinder (2). The two ends of the U-shaped rod (7) are inserted into the grooves (6) and fit tightly against the inner wall of the grooves (6).

3. A seamless steel pipe with a pressure relief structure according to claim 2, characterized in that: The annular cylinder (2), the annular frame (3), and the positioning seat (8) are an integrated structure, and the seamless steel pipe body (1) and the annular seat (4) are an integrated structure.

4. A seamless steel pipe with a pressure relief structure according to claim 3, characterized in that: The pressure relief block (11) has an isosceles trapezoidal structure.

5. A seamless steel pipe with a pressure relief structure according to claim 4, characterized in that: One end of the spring (10) is fixed inside the cavity (9), and the other end is connected to the pressure relief block (11).

6. A seamless steel pipe with a pressure relief structure according to claim 5, characterized in that: A sealing strip (12) is provided between the periphery of the pressure relief block (11) and the inner wall of the cavity (9).

Images