Stainless steel protection type pipeline elbow
By combining a stainless steel shell with a polyurea elastomer loss layer and using a curved channel design, the corrosion resistance and leakage prevention problems of existing pipe elbows in high-pressure and high-corrosion environments are solved, resulting in a long-life, low-maintenance pipe elbow.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 中电建路桥集团有限公司
- Filing Date
- 2025-07-07
- Publication Date
- 2026-05-15
AI Technical Summary
Existing pipe elbows have poor corrosion resistance and weak impact resistance in high-pressure and highly corrosive environments, making them prone to brittle fracture, resulting in high maintenance costs and insufficient anti-seepage performance. They cannot meet the requirements for long-term, low-maintenance, and high-safety use.
It adopts a composite structure of stainless steel shell and polyurea elastomer loss layer. The loss layer is attached to the inner wall of the bend by ultraviolet curing process. It is designed as a curved water-binding channel and a water-draining channel. Combined with steel-plastic composite ring and fixing components, it forms a high-strength, corrosion-resistant and seepage-proof pipe bend.
It significantly extends the service life of pipe elbows, reduces maintenance costs, reduces wear and eddy current generation, improves seepage prevention performance, and meets the needs of high water pressure environments.
Smart Images
Figure CN224245705U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pipe elbow technology, specifically a stainless steel protective pipe elbow. Background Technology
[0002] Protective pipe elbows are key components in piping systems, installed at pipe bends. Due to their low cost, standardization, and short-term stability, they are commonly used in basic engineering. However, their shortcomings in flexibility, corrosion resistance, intelligence, and long-term reliability limit their application in complex or harsh environments. These elbows are mainly passively defensive, achieving basic protection through material strength, simple coatings, and structural design. They are suitable for large-scale projects in low-pressure, low-corrosion environments.
[0003] Currently, pipe elbows are generally made of cast iron or carbon steel. These elbows have poor corrosion resistance and impact resistance, and are prone to brittle fracture. Although the initial cost is low, the service life is short, requiring frequent maintenance and replacement, resulting in high overall maintenance costs. The bends lack specialized impact-resistant structures, have high internal flow resistance, and are prone to stress concentration when reinforced with steel bars. Furthermore, the anti-seepage performance at the joints is poor, and the installation accuracy requirements are high. When facing high-pressure and highly corrosive environments, if the accuracy is insufficient, it is difficult to play a good protective role. Moreover, due to the effect of high water pressure, the water flow is turbulent, which leads to accelerated pipe wear and cannot meet the requirements for long-term, low-maintenance, and high-safety use.
[0004] Therefore, this utility model provides a stainless steel protective pipe elbow to solve the above problems. Utility Model Content
[0005] To address the shortcomings of existing technologies, this utility model provides a stainless steel protective pipe elbow, which solves the aforementioned problems of poor corrosion resistance, weak impact resistance, and high maintenance costs.
[0006] To achieve the above objectives, this utility model provides the following technical solution: a stainless steel protective pipe elbow, comprising a stainless steel outer shell and an upper welding port and a lower welding port respectively disposed at both ends of the stainless steel outer shell and welded to the pipe, and further comprising:
[0007] The loss layer is disposed in the curved section of the stainless steel shell, and the two ends of the loss layer are respectively connected to a water-binding channel and a water-draining channel symmetrically arranged with the central axis of the stainless steel shell, and the water-binding channel and the water-draining channel gradually narrow from the outside to the inside.
[0008] The curved channel is located in the curved section of the loss layer. The water-binding channel and the water-draining channel are designed in a curved shape, forming a curved channel between them.
[0009] Preferably, fixing components are welded to both sides of the stainless steel shell. The fixing components include a lower fixing plate and an upper fixing plate, and the lower fixing plate and the upper fixing plate are symmetrically welded to the outside of the stainless steel shell. The upper fixing plate has a protrusion at its end, and the lower fixing plate has a groove at its end that cooperates with the protrusion to form a positioning structure.
[0010] Preferably, both the lower fixing plate and the upper and lower fixing plates have three screw holes. After the upper and lower screw holes are aligned, they can be detachably fixed by screws and nuts. Two pairs of lower fixing plates and upper fixing plates are installed at each weld joint.
[0011] Preferably, the loss layer is made of polyurea elastomer material and is attached to the inner wall of the bend by ultraviolet curing process. The thickness of the loss layer gradually increases from the water-binding channel to the bend channel, maintains the maximum thickness at the bend channel, and then gradually decreases towards the drainage channel. The thickness of the loss layer is the same at the water-binding port and the drainage port.
[0012] Preferably, the inner diameter of the curved channel is the same as the throat diameter of the narrowing part of the water-binding channel and the water-draining channel. The ends of the water-binding channel and the water-draining channel away from the curved channel are respectively connected to water-binding inlets and water-draining inlets for water binding and water drainage. The water-binding inlets and water-draining inlets are steel-plastic composite rings, symmetrically arranged on both sides of the curved section of the stainless steel shell, and the inner sides are respectively connected to the water-binding channel and the water-draining channel.
[0013] Preferably, the wall thickness of the stainless steel outer shell from the upper and lower weld joints to the water inlet and drain outlet is the same as the wall thickness of the connecting pipe. Beneficial effects
[0014] This utility model provides a stainless steel protective pipe elbow. Compared with the prior art, it has the following advantages:
[0015] (1) The stainless steel protective pipe elbow has a composite structure of stainless steel shell and polyurea elastomer loss layer. The stainless steel shell provides high strength support and excellent corrosion resistance. The loss layer is attached to the inner wall of the bend by ultraviolet curing process. Its thickness gradually increases from the water concentrating channel to the bending channel and then decreases from the water diversion channel. It can specifically resist water flow impact. The elastic buffering effect of polyurea material can effectively absorb water flow energy, so that wear is concentrated in the loss layer rather than the pipe body. Experimental data show that the wear degree is reduced by 66%-68% compared with the traditional design, which significantly extends the service life of the elbow and reduces maintenance costs.
[0016] (2) The stainless steel protective pipe elbow has a steel-plastic composite ring structure with a water-binding port and a water-draining port. The inner side is connected to the curved water-binding channel and the water-draining channel, which can guide the water flow smoothly through the curved section along the channel with a gradually changing cross section, reducing the generation of eddies and flow resistance. At the same time, the protrusion at the end of the upper fixed plate and the groove at the end of the lower fixed plate are positioned in conjunction with the bolt connection of the screw hole, which ensures that the upper and lower parts of the elbow are tightly spliced, effectively improving the anti-seepage performance, avoiding high-pressure water leakage, and meeting the use requirements under high water pressure environment. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0018] Figure 2 This is a three-dimensional view of the overall structure of this utility model.
[0019] Figure 3 This is a cross-sectional view of the internal structure of this utility model;
[0020] Figure 4 This is a three-dimensional view of the internal structure of this utility model.
[0021] In the picture:
[0022] 1. Upper weld joint; 2. Lower fixing plate; 3. Upper fixing plate; 4. Water inlet; 5. Loss layer; 6. Bending channel; 7. Screw hole; 8. Lower weld joint; 9. Drain outlet; 10. Stainless steel shell; 11. Groove; 12. Protrusion; 13. Water inlet channel; 14. Drain outlet channel. Detailed Implementation
[0023] 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. Example
[0024] Please see Figures 1 to 4 The system includes a stainless steel outer shell 10 and an upper welding port 1 and a lower welding port 8 respectively located at both ends of the stainless steel outer shell 10 and welded to a pipe. Its characteristic is that it further includes:
[0025] The loss layer 5 is disposed in the curved section of the stainless steel shell 10, and the two ends of the loss layer 5 are respectively connected to a water-binding channel 13 and a water-draining channel 14 symmetrically arranged with the central axis of the stainless steel shell 10, and the water-binding channel 13 and the water-draining channel 14 gradually narrow from the outside to the inside.
[0026] The curved channel 6 is located in the curved section of the loss layer 5. The water-binding channel 13 and the water-draining channel 14 are designed in a curved shape, forming the curved channel 6 between them.
[0027] The inner diameter of the curved channel 6 is the same as the throat diameter at the narrowing point of the water-binding channel 13 and the water-draining channel 14. The ends of the water-binding channel 13 and the water-draining channel 14 away from the curved channel 6 are respectively connected to water-binding inlet 4 and water-draining inlet 9 for water binding and drainage. Water-binding inlet 4 and water-draining inlet 9 are steel-plastic composite rings, symmetrically arranged on both sides of the curved section of the stainless steel shell 10, and their inner sides are respectively connected to the water-binding channel 13 and the water-draining channel 14.
[0028] The loss layer 5 is made of polyurea elastomer material and is attached to the inner wall of the bend through ultraviolet curing process. The thickness of the loss layer 5 gradually increases from the water-binding channel 13 to the bend channel 6, with the maximum thickness maintained at the bend channel 6, and then gradually decreases towards the water-draining channel 14. The thickness of the loss layer 5 is the same at the water-binding port 4 and the water-draining port 9.
[0029] The wall thickness of the stainless steel outer shell 10 from the upper weld port 1 and the lower weld port 8 to the water inlet 4 and the drain outlet 9 is the same as the wall thickness of the connecting pipe.
[0030] Water flows into the elbow through the upper weld joint 1, first entering the water-binding channel 13 through the water-binding inlet 4. As the water-binding channel 13 gradually narrows from the outside in, the water flow is constrained and accelerated, forming a stable stream that enters the curved channel 6. The curved channel 6 adopts a curved design, and its inner diameter is consistent with the throat diameter of the water-binding channel 13 and the drainage channel 14, ensuring a uniform transition in water flow velocity. When the water flows through the curved section, the loss layer 5 on the outer side of the curved channel 6 (its thickness gradually increases from the water-binding channel 13 to the curved channel 6) effectively resists the impact and wear of the high-pressure water flow. The loss layer 5 of the polyurea elastomer material is cured by ultraviolet light. The material is attached to the inner wall, and its elastic buffering effect can absorb the impact energy of the water flow, preventing the stainless steel shell 10 from being directly subjected to scouring. Then the water flows out through the drainage channel 14 and the drainage port 9. The design of the wear layer 5 gradually decreasing in thickness towards the drainage channel 14 can adapt to the wear requirements after the water flow velocity decreases, and achieve a reasonable distribution of materials. Since the thickness of the wear layer 5 is the same at the water outlet 4 and the drainage port 9, the wear resistance at both ends is guaranteed to be uniform, avoiding premature local damage. Experimental data shows that the wear degree is reduced by 66%-68% compared with the traditional design, which significantly extends the service life of the elbow and reduces maintenance costs, as shown in Table 1.
[0031] Table 1 Example 2:
[0032] Please see Figures 1 to 4This embodiment provides a technical solution based on embodiment one: a fixing component is welded to both sides of the stainless steel shell 10. The fixing component includes a lower fixing plate 2 and an upper fixing plate 3, and the lower fixing plate 2 and the upper fixing plate 3 are symmetrically welded to the outside of the stainless steel shell 10. The upper fixing plate 3 has a protrusion 12 at its end, and the lower fixing plate 2 has a groove 11 at its end that cooperates with the protrusion 12 to form a positioning structure.
[0033] Both the lower fixing plate 2 and the lower and upper fixing plates 3 are provided with three screw holes 7. After the upper and lower screw holes 7 are aligned, they can be detachably fixed by screws and nuts. Two pairs of lower fixing plates 2 and upper fixing plates 3 are installed at each weld joint.
[0034] During installation, the protrusion 12 of the upper fixing plate 3 aligns with the groove 11 of the lower fixing plate 2, forming a mechanical positioning structure to ensure the installation accuracy of the upper and lower parts of the elbow. Each fixing plate is provided with three screw holes 7. Bolts are passed through the aligned screw holes 7 and the nuts are tightened to achieve detachable fixing. At each weld joint, the four fixing plates, two pairs of upper and lower fixing plates, are distributed close to the weld joint, so that the welding stress is evenly distributed through the fixing plates, avoiding local stress concentration. The wall thickness of the stainless steel shell 10 from the weld joint to the water inlet 4 and the drain outlet 9 is consistent with the connecting pipe, ensuring the continuity of the overall structural strength. When water flows through the water inlet 4 and the drain outlet 9, the steel-plastic composite material... The circular structure combines rigid support and corrosion resistance. The inner water-binding channel 13 and drainage channel 14 guide the water flow along a curved path, reducing the generation of eddies. The loss layer 5 covering the outside of the channel and the thick loss layer 5 on the outside of the curved channel 6 form an overall protective system. Under the constraint of the water-binding channel 13, the water flows smoothly through the curved section along the surface of the loss layer 5, avoiding direct impact on the stainless steel body. The narrowing design of the drainage channel 14 can help the water flow to be discharged faster, reduce water pressure fluctuations in the bend, and further reduce wear. The bolt connection and concave-convex positioning of the upper and lower fixing plates ensure the tightness of the elbow splice, effectively preventing high-pressure water leakage and improving the anti-seepage performance.
[0035] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.
[0036] Working principle: During operation, the upper welding port 1 and the lower welding port 8 are first welded to the front and rear sections of the pipe respectively. The protrusion 12 of the upper fixing plate 3 and the groove 11 of the lower fixing plate 2 are aligned to position the upper and lower parts of the elbow. Screws and nuts are installed through the screw holes 7 to fix it, ensuring that the joint of the stainless steel shell 10 is tight and leak-proof. Water flows in through the upper welding port 1, and enters the water constriction channel 13 through the water constriction port 4. The water constriction channel 13 and the drainage channel 14 are symmetrical about the central axis of the stainless steel shell 10 and gradually narrow from the outside to the inside, constraining the water flow into the curved channel 6. The curved channel 6... The outermost loss layer 5 has the largest thickness. Its polyurea elastomer material is attached to the inner wall through a UV curing process, effectively resisting the impact of water flow. Subsequently, the water flows out from the drain outlet 9 through the drainage channel 14. The thickness of the loss layer 5 increases from the water-binding channel 13 to the curved channel 6, and then decreases from the drainage channel 14. The thickness of the water-binding outlet 4 and the drainage outlet 9 is the same, achieving uniform wear protection. The inner side of the water-binding outlet 4 and the drainage outlet 9 of the steel-plastic composite material is connected to the water-binding channel 13 and the drainage channel 14, guiding the water flow to pass smoothly along the curved path, reducing eddies and wear.
[0037] It should be noted that all standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.
[0038] 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, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A stainless steel protective pipe elbow, comprising a stainless steel shell (10) and an upper weld joint (1) and a lower weld joint (8) respectively disposed at both ends of the stainless steel shell (10) and welded to the pipe, characterized in that: Also includes: The loss layer (5) is provided in the curved section of the stainless steel shell (10), and the two ends of the loss layer (5) are respectively connected to a water-binding channel (13) and a water-draining channel (14) arranged symmetrically with the central axis of the stainless steel shell (10), and the water-binding channel (13) and the water-draining channel (14) gradually narrow from the outside to the inside. The curved channel (6) is located in the curved section of the loss layer (5). The water-binding channel (13) and the water-draining channel (14) are designed in a curved shape, forming a curved channel (6) between them.
2. The stainless steel protective pipe elbow according to claim 1, characterized in that: Fixing components are welded to both sides of the stainless steel shell (10). The fixing components include a lower fixing plate (2) and an upper fixing plate (3). The lower fixing plate (2) and the upper fixing plate (3) are symmetrically welded to the outside of the stainless steel shell (10). The upper fixing plate (3) has a protrusion (12) at its end, and the lower fixing plate (2) has a groove (11) at its end that cooperates with the protrusion (12) to form a positioning structure.
3. A stainless steel protective pipe elbow according to claim 2, characterized in that: The lower fixing plate (2) and the upper and lower fixing plates (3) are each provided with three screw holes (7). After the upper and lower screw holes (7) are aligned, they can be detachably fixed by screws and nuts. Two pairs of lower fixing plates (2) and upper fixing plates (3) are installed at each weld joint.
4. A stainless steel protective pipe elbow according to claim 1, characterized in that: The loss layer (5) is made of polyurea elastomer material and is attached to the inner wall of the bend by ultraviolet curing process. The thickness of the loss layer (5) gradually increases from the water-binding channel (13) to the bend channel (6), maintains the maximum thickness at the bend channel (6), and gradually decreases towards the drainage channel (14). The thickness of the loss layer (5) is the same at the water-binding port (4) and the drainage port (9).
5. A stainless steel protective pipe elbow according to claim 1, characterized in that: The inner diameter of the curved channel (6) is the same as the throat diameter of the narrowing part of the water-binding channel (13) and the water-draining channel (14). The ends of the water-binding channel (13) and the water-draining channel (14) away from the curved channel (6) are respectively connected to the water-binding port (4) and the water-draining port (9) for water binding and water drainage. The water-binding port (4) and the water-draining port (9) are steel-plastic composite rings, symmetrically arranged on both sides of the curved section of the stainless steel shell (10), and the inner sides are respectively connected to the water-binding channel (13) and the water-draining channel (14).
6. A stainless steel protective pipe elbow according to claim 1, characterized in that: The wall thickness of the stainless steel shell (10) from the upper weld (1) and lower weld (8) to the water inlet (4) and drain outlet (9) is consistent with the wall thickness of the connecting pipe.