Stainless steel seamless pipe for conveying hot water
Patent Information
- Application Number
- CN202522605428.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-09
- Publication Date
- 2026-10-23
- Estimated Expiration
- 2035-12-09
AI Technical Summary
螺栓在拧紧时，各个螺栓的松紧程度不容易保持完全统一，安装后会出现部分螺栓拧的更紧或更松的情况，密封垫受力不均匀，密封垫与法兰之间会出现细小缝隙，热水在管道中的压力通常比冷水大，热水挤压密封垫后，更容易从缝隙处渗出
[0012]本实用新型的有益效果在于：当钢管A和钢管B内通入热水时，管道内部温度会升高，温度升高到记忆合金环的变形温度时（记忆合金环制造时设定低温相为波纹环形，高温相为圆环形），记忆合金环会从波纹环形变成圆环形（变形后记忆合金环外径大于密封垫B内径），变形过程中记忆合金环会逐渐对密封垫B进行挤压，使密封垫B完全填满与法兰A和法兰B连接缝隙处，起到了提升密封性的作用，避免热水泄漏；由于密封圈与法兰A和法兰B固定连接，密封圈在密封垫B外侧又形成多个密封点，起到了进一增强密封性的作用；综上所述，本实用新型具备增强密封性，避免热水泄漏的有益效果，解决了螺栓安装后会出现部分螺栓拧的更紧或更松的情况，密封垫受力不均匀，密封垫与法兰之间会出现细小缝隙，热水在管道中的压力通常比冷水大，热水挤压密封垫后，更容易从缝隙处渗出的问题。
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Figure CN224886560U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of steel pipe technology, specifically to a seamless stainless steel pipe for transporting hot water. Background Technology
[0002] Stainless steel seamless pipe, as the name suggests, is a type of steel pipe with a hollow cross-section and no seams throughout its entire body. It is manufactured from stainless steel billets through a series of processes including piercing, hot rolling, cold rolling, or cold drawing. Due to its seamless nature, it has significant advantages over welded pipes in terms of pressure resistance, uniformity, and reliability, and is widely used in petroleum, chemical, and machinery manufacturing industries.
[0003] When transporting hot water, stainless steel seamless pipes are typically assembled from multiple pipe sections using connectors to form a hot water delivery system. The pipes are usually connected by flanges, with gaskets placed between the flanges for sealing, and then tightened with bolts. However, it's not easy to maintain a completely uniform tightness when tightening the bolts. After installation, some bolts may be tightened too much or too little, resulting in uneven stress on the gaskets and small gaps between the gaskets and flanges. Since the pressure of hot water in the pipes is usually higher than that of cold water, the hot water, after pressing against the gaskets, is more likely to seep out through these gaps. Utility Model Content
[0004] The purpose of this invention is to provide a seamless stainless steel pipe for conveying hot water, so as to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a seamless stainless steel pipe for conveying hot water, comprising a steel pipe A, a steel pipe B located to the right of steel pipe A, and flanges A and B respectively fixedly disposed to the right of steel pipe A and the left of steel pipe B. A sealing assembly is provided between flanges A and B, the sealing assembly comprising a sealing gasket A, a sealing gasket B fixedly disposed inside the sealing gasket A, and a shape memory alloy ring. The thickness of the sealing gasket B is greater than the thickness of the sealing gasket A. The connection between the sealing gasket A and the sealing gasket B is arc-shaped. The shape memory alloy ring is a corrugated ring. Sealing grooves matching the sealing gaskets A and B are opened on the sidewalls of flanges A and B facing each other. The sealing gaskets A and B are both located in the sealing grooves and abut against flanges A and B. The shape memory alloy ring is located in the sealing grooves and abuts against the sealing gasket B. Flanges A and B are fixedly connected by a locking assembly.
[0006] Preferably, the shape memory alloy ring is located inside the sealing gasket B, and an outer ring is fixedly provided on the outside of the shape memory alloy ring, the outer ring being in contact with the sealing gasket B.
[0007] Preferably, a plurality of sealing rings are fixedly provided on the left and right sides of the sealing gasket A, and a plurality of annular grooves matching the sealing rings are opened on the side wall of the sealing groove. The sealing rings are located in the annular grooves and abut against and connect with flange A and flange B.
[0008] Preferably, the fixing assembly includes several screws and nuts, several flat washers and spring washers, and through holes are provided on both flange A and flange B. After the screw passes through the through holes on flange A and flange B, the flat washers and spring washers are fitted onto the screw, and the nut is screwed into the screw to fix it in place.
[0009] Preferably, both steel pipe A and steel pipe B have an aluminum alloy layer on their inner sides, and the inner side of the aluminum alloy layer has a ceramic coating.
[0010] Preferably, the sealing gasket A, sealing gasket B, and sealing ring are all made of EPDM rubber and are integrally molded.
[0011] Preferably, both steel pipe A and steel pipe B are wrapped with aerogel felt on their outer sides.
[0012] The beneficial effects of this utility model are as follows: When hot water is introduced into steel pipes A and B, the internal temperature of the pipes will rise. When the temperature rises to the deformation temperature of the shape memory alloy ring (the shape memory alloy ring is designed with a corrugated ring at low temperature and a circular ring at high temperature during manufacturing), the shape memory alloy ring will change from a corrugated ring to a circular ring (after deformation, the outer diameter of the shape memory alloy ring is larger than the inner diameter of the sealing gasket B). During the deformation process, the shape memory alloy ring will gradually squeeze the sealing gasket B, so that the sealing gasket B completely fills the gap between the sealing gasket B and the flange A and flange B, which improves the sealing performance and prevents hot water leakage. Since the sealing ring is fixedly connected to flanges A and B, the sealing ring forms multiple sealing points on the outside of the sealing gasket B, which further enhances the sealing performance. In summary, this utility model has the beneficial effects of enhancing sealing performance and preventing hot water leakage. It solves the problems that after bolt installation, some bolts may be tightened or loosened, the sealing gasket may be unevenly stressed, small gaps may appear between the sealing gasket and the flange, and the pressure of hot water in the pipe is usually greater than that of cold water, making it easier for hot water to seep out from the gaps after squeezing the sealing gasket. Attached Figure Description
[0013] Appendix Figure 1 This is a schematic diagram of the structure of this utility model; Appendix Figure 2 This is a schematic diagram of the connection structure of this utility model; Appendix Figure 3 This is the left view of the present invention; Appendix Figure 4 For the appendix Figure 3 Sectional view at point AA; Appendix Figure 5 For the appendix Figure 4Enlarged view of point A in the middle.
[0014] In the diagram: 1. Steel pipe A; 2. Steel pipe B; 3. Flange A; 4. Flange B; 5. Gasket A; 6. Gasket B; 7. Shape memory alloy ring; 8. Sealing groove; 9. Outer ring; 10. Sealing ring; 11. Ring groove; 12. Screw; 13. Nut; 14. Flat washer; 15. Spring washer; 16. Through hole; 17. Aluminum alloy layer; 18. Ceramic coating; 19. Aerogel felt. Detailed Implementation
[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.
[0016] like Figure 1-5As shown, this utility model discloses a seamless stainless steel pipe for conveying hot water, including a steel pipe A1, a steel pipe B2 located to the right of steel pipe A1, and flanges A3 and B4 respectively fixedly disposed to the right of steel pipe A1 and the left of steel pipe B2. A sealing assembly is provided between flanges A3 and B4. The sealing assembly includes a sealing gasket A5, a sealing gasket B6 fixedly disposed inside the sealing gasket A5, and a shape memory alloy ring 7. The thickness of the sealing gasket B6 is greater than the thickness of the sealing gasket A5. The connection between the sealing gasket A5 and the sealing gasket B6 is arc-shaped. The shape memory alloy ring 7 is a corrugated ring. Sealing grooves 8 matching the sealing gaskets A5 and B6 are opened on the side walls of flanges A3 and B4 facing each other. The sealing gaskets A5 and B6 are located in the sealing grooves 8 and abut against flanges A3 and B4. The shape memory alloy ring 7 is located in the sealing grooves 8 and abuts against the sealing gasket B6. Flanges A3 and B4 are fixedly connected by a locking assembly. In this experimental setup, sealing gaskets A5 and B6, along with the shape memory alloy ring 7, are placed in the sealing groove 8, ensuring the shape memory alloy ring 7 abuts against the sealing gasket B6. The sealing ring 10 is positioned within the ring groove 11. Flanges A3 and B4 are then fixed together using screws 12 and nuts 13, securing sealing gaskets A5, B6, and 10 between them. When hot water is introduced into steel pipes A1 and B2, the internal temperature rises. When the temperature reaches the deformation temperature of the shape memory alloy ring 7 (the shape memory alloy ring 7 is manufactured with a corrugated ring for the low-temperature phase and a circular ring for the high-temperature phase), the ring will transform from a corrugated ring into a circular ring (after deformation, the outer diameter of the shape memory alloy ring 7 is larger than the inner diameter of the sealing gasket B6). During the forming process, the shape memory alloy ring 7 gradually compresses the sealing gasket B6, causing it to completely fill the gap between the gasket and flanges A3 and B4, thus improving the sealing performance and preventing hot water leakage. Since the sealing ring 10 is fixedly connected to flanges A3 and B4, it also forms multiple sealing points on the outside of the sealing gasket B6, further enhancing the sealing performance. In summary, this invention has the beneficial effects of enhancing sealing performance and preventing hot water leakage. It solves the problems of bolts being tightened too much or too little after installation, uneven stress on the sealing gasket, small gaps between the sealing gasket and flange, and the fact that hot water pressure in pipes is usually higher than cold water, making it easier for hot water to seep out from these gaps after compressing the sealing gasket.
[0017] Preferably, the shape memory alloy ring 7 is located inside the sealing gasket B6, and an outer ring 9 is fixedly disposed on the outer side of the shape memory alloy ring 7, with the outer ring 9 in contact with the sealing gasket B6. Because the outer ring 9 is fixedly disposed on the outer side of the shape memory alloy ring 7 and is in contact with the sealing gasket B6, when the shape memory alloy ring 7 changes from a corrugated ring to a circular ring, the outer ring 9 also deforms accordingly, embedding itself into the sealing gasket B6 and further compressing the sealing gasket B6, causing the sealing gasket B6 to fill the small gaps.
[0018] Preferably, a plurality of sealing rings 10 are fixedly disposed on the left and right sides of the sealing gasket A5, and a plurality of annular grooves 11 matching the sealing rings 10 are formed on the side wall of the sealing groove 8. The sealing rings 10 are located in the annular grooves 11 and abut against the flanges A3 and B4. Since the sealing rings 10 are located in the annular grooves 11 and abut against the flanges A3 and B4, after the sealing rings 10 are fixed to the flanges A3 and B4, the sealing rings 10 form multiple sealing points on the outside of the sealing gasket B6, which further enhances the sealing performance.
[0019] Preferably, the fixing assembly includes several screws 12 and nuts 13, several flat washers 14 and spring washers 15. Both flange A3 and flange B4 have through holes 16. After the screws 12 pass through the through holes 16 in flange A3 and flange B4, the flat washers 14 and spring washers 15 are fitted onto the screws 12. The nuts 13 are screwed into the screws 12 and fixedly connected. Because the flat washers 14 and spring washers 15 are fitted onto the screws 12 after they pass through the through holes 16 in flange A3 and flange B4, and the nuts 13 are screwed into the screws 12 and fixedly connected, flange A3 and flange B4 are fixed together. The operator can judge the tightness of the nuts 13 based on the compression degree of the spring washers 15, facilitating uniform tightening of the nuts 13, ensuring even force distribution on the sealing components, and the compressed spring washers 15 also prevent the screws 12 from loosening.
[0020] Preferably, both steel pipe A1 and steel pipe B2 have an aluminum alloy layer 17 on their inner sides, and the inner side of the aluminum alloy layer 17 has a ceramic coating 18. The aluminum alloy layer 17 on the inner sides of both steel pipe A1 and steel pipe B2 provides rigid support and oxygen barrier function, preventing pipe wall corrosion; the ceramic coating 18 on the inner side of the aluminum alloy layer 17 reduces the adhesion of scale and bacteria.
[0021] Preferably, the sealing gasket A5, sealing gasket B6, and sealing ring 10 are all made of EPDM rubber and are integrally molded. Since the sealing gasket A5, sealing gasket B6, and sealing ring 10 are all made of EPDM rubber, they possess characteristics such as good heat resistance, aging resistance, and good elasticity.
[0022] Preferably, both steel pipe A1 and steel pipe B2 are wrapped with aerogel felt 19. Because both steel pipe A1 and steel pipe B2 are wrapped with aerogel felt 19, they provide insulation, preventing the hot water temperature from dropping.
[0023] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A seamless stainless steel pipe for conveying hot water, comprising a steel pipe A (1), a steel pipe B (2) located to the right of the steel pipe A (1), and flanges A (3) and B (4) respectively fixedly disposed to the right of the steel pipe A (1) and to the left of the steel pipe B (2), characterized in that: A sealing assembly is provided between flange A (3) and flange B (4). The sealing assembly includes a sealing gasket A (5), a sealing gasket B (6) fixedly disposed inside the sealing gasket A (5), and a shape memory alloy ring (7). The thickness of the sealing gasket B (6) is greater than the thickness of the sealing gasket A (5). The connection between the sealing gasket A (5) and the sealing gasket B (6) is arc-shaped. The shape memory alloy ring (7) is a corrugated ring. Sealing grooves (8) matching the sealing gasket A (5) and the sealing gasket B (6) are opened on the side walls of flange A (3) and flange B (4) facing each other. The sealing gasket A (5) and the sealing gasket B (6) are both located in the sealing grooves (8) and abut against the flange A (3) and flange B (4). The shape memory alloy ring (7) is located in the sealing grooves (8) and abuts against the sealing gasket B (6). The flange A (3) and flange B (4) are fixedly connected by a locking assembly.
2. A seamless stainless steel pipe for conveying hot water according to claim 1, characterized in that: The shape memory alloy ring (7) is located inside the sealing gasket B (6), and an outer ring (9) is fixedly provided on the outside of the shape memory alloy ring (7). The outer ring (9) is in contact with the sealing gasket B (6).
3. A seamless stainless steel pipe for conveying hot water according to claim 1, characterized in that: Several sealing rings (10) are fixedly installed on the left and right sides of the sealing gasket A (5). Several annular grooves (11) matching the sealing rings (10) are opened on the side wall of the sealing groove (8). The sealing rings (10) are located in the annular grooves (11) and are in contact with the flanges A (3) and B (4).
4. A seamless stainless steel pipe for conveying hot water according to claim 1, characterized in that: The fixing assembly includes several screws (12) and nuts (13), several flat washers (14) and spring washers (15). Both flange A (3) and flange B (4) have through holes (16). After the screws (12) pass through the through holes (16) on flange A (3) and flange B (4), the flat washers (14) and spring washers (15) are fitted onto the screws (12). The nuts (13) are screwed into the screws (12) and fixedly connected to the screws (12).
5. A seamless stainless steel pipe for conveying hot water according to claim 1, characterized in that: Both steel pipe A (1) and steel pipe B (2) have an aluminum alloy layer (17) on their inner sides, and the aluminum alloy layer (17) has a ceramic coating (18) on its inner side.
6. A seamless stainless steel pipe for conveying hot water according to claim 3, characterized in that: The sealing gasket A (5), sealing gasket B (6) and sealing ring (10) are all made of EPDM rubber and are integrally molded.
7. A seamless stainless steel pipe for conveying hot water according to claim 1, characterized in that: Both steel pipe A (1) and steel pipe B (2) are wrapped with aerogel felt (19).