A kind of anti-scouring chemical pipeline elbow based on three-way and blind head combination

Abstract

The utility model relates to chemical pipeline device technical field, especially a kind of anti-scouring chemical pipeline elbow based on the combination of tee and blind head, it is characterized in that, tee body upper side port is provided with connecting assembly, the connecting assembly is detachably connected with the pressure-resistant blind plate matched with tee body upper side port, sealing assembly is arranged between tee body upper side port and pressure-resistant blind plate;The flange ring is fixedly connected with the support frame, the flange ring is bolted with pressure-resistant blind plate, the flange ring and tee body upper side port between are provided with the annular groove matched with sealing assembly;The sealing assembly includes the sealing ring of being coaxially fixedly connected with pressure-resistant blind end and being inserted with annular groove, sealing pad is respectively laid in the inside and outside of sealing ring, the upper and lower ends of sealing pad are respectively abutted with pressure-resistant blind plate and tee body upper side port, the elastic supporting piece is connected with the outer edge of tee body upper side, the elastic supporting piece is fixedly connected with the sealing ring matched with the abutment of sealing ring.

Description

Technical Field

[0001] This utility model relates to the field of chemical pipeline equipment technology, and in particular to an anti-scouring chemical pipeline elbow based on a combination of a tee and a blind end. Background Technology

[0002] In chemical production, the pipeline system is the core carrier for media transportation, and its operational reliability directly affects the continuity and safety of production. Chemical fluids often have special characteristics: some contain solid impurities, some are strong acids, strong alkalis, or organic solvents, and the transportation pressure is usually between 0.6-10 MPa, with a temperature range covering -20℃ to 300℃, which places extremely high demands on the erosion resistance and corrosion resistance of pipeline components.

[0003] Traditional pipe elbows, designed to meet media turning requirements (such as 90° or 45° turns), employ a one-piece molded bending structure (the radius of curvature is typically 1-1.5 times the pipe diameter). When fluid flows through this bend, centrifugal force and the channel shape create strong vortices on the inner side of the corner, while the local flow velocity increases by 30%-50% compared to straight pipe sections. This results in concentrated scouring force acting on the inner wall of the corner. According to statistics from the chemical industry, "scouring wear" accounts for over 60% of the failure causes of traditional elbows, and their average service life is only one-third that of straight pipe sections.

[0004] Current industry solutions for addressing erosion issues have significant limitations: First, custom elbows are made using wear-resistant alloys (such as duplex steel) or lined with wear-resistant materials (such as alumina ceramics), but these cost 3-5 times more than ordinary elbows, and the lining is prone to detachment due to temperature differences or vibration. Second, increasing the elbow's radius of curvature increases the required pipeline installation space, making it difficult to adapt to the compact layout of chemical plants. Third, adding baffles to the inside of the elbow is problematic, as these baffles are easily deformed by impacts from particulate fluids, which can exacerbate localized erosion. Therefore, a new type of elbow structure that is low-cost, easily adaptable, and provides stable erosion protection is urgently needed. Utility Model Content

[0005] In view of the above situation and to overcome the defects of the prior art, this utility model provides an anti-scouring chemical pipeline elbow based on a combination of a tee and a blind end. The technical solution it solves is that it includes a tee body, characterized in that a connecting component is provided on the upper port of the tee body, the connecting component is detachably connected to a pressure-resistant blind plate that cooperates with the upper port of the tee body, and a sealing component is arranged between the upper port of the tee body and the pressure-resistant blind plate. The connecting assembly includes two support frames arranged symmetrically front and back and fixedly connected to the outer edge of the tee body. The support frames are fixedly connected with flange rings. The flange rings are bolted to pressure-resistant blind flanges. An annular groove that mates with the sealing assembly is provided between the flange rings and the upper port of the tee body. The sealing assembly includes a sealing ring that is coaxially fixedly connected to the pressure-resistant blind end and inserted into the annular groove. Sealing gaskets are respectively laid on the inner and outer sides of the sealing ring. The upper and lower ends of the sealing gaskets abut against the pressure-resistant blind plate and the upper port of the tee body, respectively. An elastic support member is connected to the upper outer edge of the tee body. A sealing ring that abuts against the sealing ring is fixedly connected to the elastic support member.

[0006] Preferably, the elastic support members are in two sets and are arranged symmetrically about the axis of the upper port of the tee body; Each set of elastic support components includes a vertical shaft fixedly connected to the upper port of the tee body. A baffle is fixedly connected to the lower end of the vertical shaft. A sliding sleeve is mounted on the vertical shaft in a vertical sliding manner. An L-shaped connecting rod is fixedly connected to the outer edge of the sliding sleeve. A mounting ring with an annular groove is fixedly connected to the L-shaped connecting rod. The upper end of the mounting ring is fixedly connected to a sealing ring. A support spring is fixedly connected to the opposite end of the sliding sleeve and the baffle. The support spring is arranged coaxially with the vertical shaft.

[0007] Preferably, the inner wall of the sleeve is fixedly connected with two sliders arranged symmetrically about its axis, and the outer edge of the vertical shaft is provided with two grooves that correspond one-to-one with the sliders and slide vertically.

[0008] The beneficial effects of this utility model are: 1. Abandoning the traditional one-piece bent structure of elbows, it adopts a combination of standard tees (i.e. tee body) and blind flanges (i.e. pressure-resistant blind flanges) readily available in the chemical industry, reducing production and procurement costs, and facilitating partial replacement in the future (e.g., if the blind flange wears out, only the blind flange needs to be replaced, without the need for complete disassembly).

[0009] 2. The scouring force is transformed from "concentrated" to "dispersed". Through the "T-shaped" cavity structure of the tee body and the sealing effect of the pressure-resistant blind plate, the "concentrated vortex-high scouring force" at the corner of the traditional elbow is transformed into "cavity diffusion-dispersed scouring". The scouring area is expanded by 3-5 times, and the local scouring intensity is significantly reduced, fundamentally solving the corner wear problem.

[0010] 3. Wide adaptability and flexible response to various scenarios: The material and specifications of the tee and blind head can be flexibly adjusted according to the pipeline turning angle (45°, 90°, 135°), medium characteristics (corrosive, high temperature, containing particles), and pressure level (PN1.6-PN10) without modifying the core structure. It is suitable for various pipeline scenarios such as reactor feeding, distillation column discharging, and wastewater treatment in chemical production.

[0011] 4. Safety and Maintenance Upgrades: Reduced Risk and Costs. After assembly, a standard pressure test ensures a seal, reducing the risk of leakage. During later maintenance, there is no need to stop the machine to replace the entire pipeline; only worn blind joints or seals need to be replaced, reducing maintenance time by 80%. At the same time, it avoids safety accidents caused by elbow failure, balancing safety and economy. Attached Figure Description

[0012] Figure 1 This is a first-person perspective three-dimensional sectional view of the present invention.

[0013] Figure 2 This utility model Figure 1 A magnified view of region A in the middle.

[0014] Figure 3 This utility model Figure 2 A magnified view of region B in the middle.

[0015] Figure 4 This is a partial three-dimensional sectional view of the present invention from a second perspective.

[0016] Figure 5 This is a third-person perspective stereoscopic view of the present invention.

[0017] Attached Figure

[0018] 1. Tee body, 2. Connecting assembly, 3. Pressure-resistant blind flange, 4. Sealing assembly, 5. Support frame, 6. Flange ring, 7. Annular groove, 8. Sealing ring, 9. Sealing gasket, 10. Elastic support, 11. Sealing ring, 12. Vertical shaft, 13. Baffle, 14. Sliding sleeve, 15. L-shaped connecting rod, 16. Mounting ring, 17. Support spring, 18. Slider, 19. Slide groove. Detailed Implementation

[0019] The following is in conjunction with the appendix Figure 1-5 The specific embodiments of this utility model will be described in further detail.

[0020] Working principle: This application replaces the traditional one-piece elbow with a combination structure of "standard tee fitting + blind head + sealing connector" to achieve the dispersion of scouring force when chemical fluids are diverted and transported. The specific solution is as follows: When the chemical fluid flows into the "inlet end" of the tee body 1 along the front straight pipe, the fluid cannot be diverted because the "branch end" is blocked by the pressure-resistant blind plate 3. It can only flow along the internal channel of the tee to the "outlet end" (at a preset turning angle with the inlet end), thus realizing the diversion and transport of the medium. Compared with traditional elbows, the core of flow field optimization lies in the fact that the curved channel of traditional elbows causes the fluid to form a "concentrated vortex", and the scouring force is concentrated on the inside of the corner. In this scheme, the internal channel of the tee body 1 is a "T-shaped" structure. When the fluid flows through it, it first diffuses into the tee cavity and then flows towards the outlet end. The vortex region is dispersed from "single corner" to "tee cavity + blind head internal medium". The scouring force is distributed over a larger inner wall area. The direct scouring of the elbow inner wall at the corner is changed to scouring the blind head internal medium, and the local scouring intensity is reduced by more than 60%.

[0021] In the first embodiment, the technical solution is that, during use, a flange ring 6 is fixedly connected to the upper port of the tee body 1 via the support frame 5 of the connecting component 2, facilitating the disassembly and installation of the pressure-resistant blind flange 3. Combined with the sealing component 4, this achieves a seal at the blind end, preventing media leakage. Specifically, the sealing gasket 9 of the sealing component 4 is placed between the pressure-resistant blind flange 3 and the upper port of the tee body 1 for primary sealing.

[0022] Furthermore, to enhance the sealing effect, a sealing ring 8 is inserted into the ring groove 7 for a secondary seal. To ensure the sealing effect of the secondary seal, a sealing ring 11, which abuts against the lower end of the sealing ring 8, is fixedly connected to the elastic support 10 for further sealing. (See the attached diagram in the instruction manual.) Figure 1-3 As shown, at this time, the pressure-resistant blind flange 3 is fastened to the upper port of the tee body 1 by bolt connection, and the support spring 17 located between the sliding sleeve 14 and the baffle 13 is in a compressed state. In turn, the reaction force of the spring acts on the sliding sleeve 14, and further acts on the mounting ring 16 which is fixedly connected to the L-shaped connecting rod 15, so that the sealing ring 11 on the mounting ring 16 can tightly abut against the lower end face of the sealing ring 8 to ensure the sealing effect.

[0023] Guided by the cooperation of slider 18 and slide groove 19, elastic support 10 can also adaptively slide along the vertical axis 12 by the extension and retraction of support spring 17 to drive slide sleeve 14 and mounting ring 16 and other related components. This ensures sealing after disassembling and reinstalling pressure-resistant blind plate 3.

[0024] In Example 2, based on Example 1, this application abandons the traditional one-piece bent structure of elbows and adopts a combination of a standard tee (i.e., tee body 1) and a blind end (i.e., pressure-resistant blind flange 3) readily available in the chemical industry, reducing production and procurement costs and facilitating later partial replacement (e.g., if the blind end wears out, only the blind end needs to be replaced, without the need for complete disassembly). The scouring force is transformed from "concentrated" to "dispersed." Through the "T-shaped" cavity structure of the tee body 1 and the sealing effect of the pressure-resistant blind flange 3, the "concentrated vortex - high scouring force" at the corner of the traditional elbow is transformed into "cavity diffusion - dispersed scouring." The scouring area is expanded by 3-5 times, and the local scouring intensity is significantly reduced, fundamentally solving the corner wear problem. With wide adaptability, it flexibly addresses the needs of various scenarios. The material and specifications of the tee and blind head can be flexibly adjusted according to the pipeline turning angle (45°, 90°, 135°), media characteristics (corrosive, high temperature, containing particles), and pressure rating (PN1.6-PN10) without altering the core structure. It is suitable for various pipeline scenarios in chemical production, such as reactor feeding, distillation column discharging, and wastewater treatment. Safety and maintenance upgrades: Reduced risk and cost. After assembly, a standard pressure test ensures a seal, reducing the risk of leakage. Later maintenance does not require stopping the entire pipeline for replacement; only worn blind heads or seals need to be replaced, reducing maintenance time by 80% and avoiding safety accidents caused by elbow failure, balancing safety and economy.

Claims

1. An anti-scouring chemical pipeline elbow based on a combination of a tee and a blind end, comprising a tee body (1), characterized in that, The upper port of the tee body (1) is provided with a connecting component (2), and the connecting component (2) is detachably connected to a pressure-resistant blind plate (3) that cooperates with the upper port of the tee body (1). A sealing component (4) is arranged between the upper port of the tee body (1) and the pressure-resistant blind plate (3). The connecting assembly (2) includes two support frames (5) arranged symmetrically front and back and fixedly connected to the outer edge of the tee body (1). The support frame (5) is fixedly connected to a flange ring (6). The flange ring (6) is bolted to the pressure-resistant blind plate (3). An annular groove (7) that cooperates with the sealing assembly (4) is provided between the flange ring (6) and the upper port of the tee body (1). The sealing assembly (4) includes a sealing ring (8) that is coaxially fixedly connected to the pressure-resistant blind end and inserted into the ring groove (7). The sealing ring (8) has sealing pads (9) on its inner and outer sides respectively. The upper and lower ends of the sealing pads (9) abut against the pressure-resistant blind plate (3) and the upper port of the tee body (1) respectively. An elastic support member (10) is connected to the upper outer edge of the tee body (1). The elastic support member (10) is fixedly connected to a sealing ring (11) that abuts against the sealing ring (8).

2. The anti-scouring chemical pipeline elbow based on a combination of a tee and a blind end as described in claim 1, characterized in that, The elastic support (10) consists of two sets and is arranged symmetrically about the axis of the upper port of the tee body (1); Each set of elastic support members (10) includes a vertical shaft (12) fixedly connected to the upper port of the three-way body (1). A baffle (13) is fixedly connected to the lower end of the vertical shaft (12) coaxially. A sliding sleeve (14) is vertically slidably fitted on the vertical shaft (12). An L-shaped connecting rod (15) is fixedly connected to the outer edge of the sliding sleeve (14). An installation ring (16) with an annular groove (7) is fixedly connected to the L-shaped connecting rod (15). The upper end of the installation ring (16) is fixedly connected to the sealing ring (11). A support spring (17) is fixedly connected to the opposite end of the sliding sleeve (14) and the baffle (13). The support spring (17) is arranged coaxially with the vertical shaft (12).

3. The anti-erosion chemical pipeline elbow based on a combination of a tee and a blind end as described in claim 2, characterized in that, The inner wall of the sliding sleeve (14) is fixedly connected with two sliders (18) arranged symmetrically about its axis. The outer edge of the vertical shaft (12) is provided with two sliding grooves (19) that correspond one-to-one with the sliders (18) and slide vertically.

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