Outer sealing structure of small coupling
By using fluororubber pads and fixing components in the small couplings, the problem of loosening of the small couplings is solved, a stable connection between the couplings and the pipeline is achieved, and wear and maintenance costs are reduced.
Patent Information
- Application Number
- CN202520459092.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-17
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-03-17
AI Technical Summary
The sealing structure of existing small couplings is prone to loosening during use, which leads to increased wear between the coupling and the pipeline, increasing maintenance costs and replacement frequency.
The rubber pad and fixing components are made of fluororubber. By opening a limiting groove inside the rubber pad and setting a snap-fit cylinder inside the connecting ear, the elasticity of the spring is used to fix the coupling to the pipe, thereby enhancing the connection stability.
It effectively prevents pipe joints from shaking, reduces wear on couplings and pipes, reduces maintenance costs and replacement frequency, and extends service life.
Smart Images
Figure CN223768338U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of oil casing joint processing and manufacturing technology, and in particular to an external sealing structure for a small coupling. Background Technology
[0002] In today's highly developed industrial sector, industries such as petrochemicals and natural gas transportation are like the lifeblood of the industrial system, bearing the important mission of providing energy support for social and economic development. Among them, pipeline systems are like an intricate network of blood vessels, responsible for safely and stably transporting various precious energy resources to various places where they are needed. In this vast and complex pipeline network, every connection point is as crucial as a joint, and small couplings, as one of the most important pipeline connection components, directly affect whether the entire pipeline system can operate normally due to their sealing performance.
[0003] The sealing structure of small couplings typically employs metal sealing or a metal-rubber composite sealing method. The metal sealing surface is precision-machined to achieve an extremely low surface roughness, thereby enabling the rubber composite seal inside the small coupling to fit tightly with the oil casing, effectively preventing fluid leakage from the coupling connection and ensuring that crude oil and natural gas can be transported efficiently in a relatively closed pipeline system.
[0004] However, in actual use, the existing small coupling sealing structure is prone to loosening between couplings. This loosening can occur at any stage of pipeline operation, and it is caused by a variety of factors. In terms of vibration, vibration sources in the industrial environment will cause the pipeline to vibrate, which will cause the coupling connection to gradually loosen. At the same time, the pipeline often experiences large temperature changes during operation. When the temperature of the fluid being transported may be very high or very low, it will cause the pipeline to expand and contract thermally. Since the coefficient of thermal expansion of the small coupling and the pipeline material may not be completely consistent, the connection between the coupling and the pipeline is prone to loosening when the temperature changes. This leads to accelerated wear of the coupling and the pipeline, shortens their service life, and increases maintenance costs and replacement frequency. Utility Model Content
[0005] To overcome the above shortcomings, this utility model provides an external sealing structure for small couplings, aiming to improve the existing sealing structure of small couplings. In actual use, the connection between couplings is prone to loosening, which leads to increased wear on the couplings and pipes, and increased maintenance costs and replacement frequency.
[0006] To achieve the above objectives, this utility model provides the following technical solution: an external sealing structure for a small coupling, comprising an upper coupling and a lower coupling, wherein connecting ears are fixedly connected to the outer walls of both the upper and lower couplings, a fixing frame is fixedly connected to the inner wall of the lower coupling, a rubber pad is fixedly connected to the inner wall of the fixing frame, a groove is provided inside the lower coupling, and a fixing component is provided inside the lower coupling. The fixing component is used to further fix the pipe connection, and the fixing component includes a spring, one end of which is fixedly connected to the inside of the lower coupling, and the other end of which is fixedly connected to a fixing strip. The outer wall of the fixing strip is slidably connected to the inner wall of the groove.
[0007] Furthermore, a limiting groove is formed inside the rubber pad to prevent the pipe connection from shaking.
[0008] Furthermore, a snap-fit cylinder is provided inside the connecting ear, and a limit ring is fixedly connected to the outer wall of the snap-fit cylinder.
[0009] Furthermore, a connection hole is provided inside the connection ear, and the outer wall of the snap-fit cylinder is slidably connected to the inner wall of the connection hole.
[0010] Furthermore, a second groove is provided inside the snap-fit cylinder, and a second spring is fixedly connected inside the snap-fit cylinder.
[0011] Furthermore, a locking block is fixedly connected to one end of the second spring.
[0012] Furthermore, the outer wall of the card block is slidably connected to the inner wall of the second groove.
[0013] Furthermore, the rubber pad is made of fluororubber, which has good corrosion resistance and high temperature resistance.
[0014] This utility model has the following beneficial effects:
[0015] 1. In this utility model, the rubber pad made of fluororubber has good corrosion resistance and high temperature resistance. The rubber pad can better fill the tiny gap between the coupling and the sleeve, and play a good sealing role. By opening a limiting groove inside the rubber pad, the pipe connection can be effectively prevented from shaking, and the pipe is initially fixed. By setting the fixing component, when the oil sleeve is inserted into the coupling, its connection will squeeze the fixing strip, thereby moving the connection into the groove. The spring is compressed and contracted. When the sleeve connection is fully inserted into the coupling, the elasticity of the spring further fixes the sleeve connection, thereby effectively reducing the wear between the coupling and the pipe, and greatly reducing maintenance costs and replacement frequency.
[0016] 2. In this utility model, the snap-fit cylinder inside the connecting ear allows the upper and lower couplings to slide along the inner wall of the connecting hole during the process of aligning the connecting ears and inserting the snap-fit cylinder. This causes the inner wall of the connecting hole to press against the snap-fit block, thereby enabling the snap-fit block to move into the groove. At the same time, the spring is also compressed by the snap-fit block until the limiting ring on the outside of the snap-fit cylinder can contact the surface of the connecting ear. At this point, it indicates that the snap-fit block has slid out of the connecting hole. Then, through the elastic action of the spring, the snap-fit block is snapped onto the surface of the connecting ear, thereby fixing the upper and lower couplings and greatly enhancing the stability of the connection between the couplings. Attached Figure Description
[0017] Figure 1 This is a three-dimensional structural diagram of the external sealing structure of a small coupling proposed in this utility model;
[0018] Figure 2 This is a schematic diagram of the connecting ear structure of the external sealing structure of a small coupling proposed in this utility model;
[0019] Figure 3 for Figure 2 Enlarged view of point A in the image;
[0020] Figure 4 This is a schematic diagram of the snap-fit cylinder structure of the external sealing structure of the small coupling proposed in this utility model.
[0021] Legend:
[0022] 1. Upper coupling; 2. Lower coupling; 3. Connecting ear; 4. Spring 1; 5. Groove 1; 6. Fixing frame; 7. Rubber pad; 8. Fixing strip; 9. Connecting hole; 10. Snap-fit cylinder; 11. Limiting ring; 12. Groove 2; 13. Spring 2; 14. Locking block; 15. Limiting groove. 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.
[0024] Reference Figure 1 - Figure 3This utility model provides an embodiment of an external sealing structure for a small coupling, comprising an upper coupling 1 and a lower coupling 2. Connecting ears 3 are fixedly connected to the outer walls of both the upper coupling 1 and the lower coupling 2. A fixing frame 6 is fixedly connected to the inner wall of the lower coupling 2. First, the oil casing to be connected is placed inside the lower coupling 2 until the oil casing connection point can fully enter the fixing frame 6. A rubber pad 7 is fixedly connected to the inner wall of the fixing frame 6. A limiting groove 15 is formed inside the rubber pad 7 to prevent the pipe connection point from shaking. At this time, the rubber pad 7 inside the fixing frame 6 will fully contact the casing joint. Since the rubber pad 7 is made of fluororubber, it has good corrosion resistance and high temperature resistance, thus better filling the tiny gap between the coupling and the casing, effectively preventing leakage of the annular medium at the coupling. A groove 5 is formed inside the lower coupling 2, and a fixing component is provided inside the lower coupling 2. The fixing component is used to further secure the pipe connection. The fixing component includes a spring 4, one end of which is fixedly connected to the inside of the lower coupling 2, and the other end of which is fixedly connected to a fixing strip 8. The outer wall of the fixing strip 8 is slidably connected to the inner wall of the groove 5. At the same time, the limiting groove 15 set by the rubber pad 7 can effectively prevent the pipe connection from shaking, thus playing a role in further fixing and sealing. During the process of inserting the oil casing into the coupling, the oil casing connection will squeeze the fixing strip 8, causing the fixing strip 8 to move into the groove 5. During the movement of the fixing strip 8, the spring 4 will also be squeezed and contracted until the oil casing connection is completely inserted into the coupling. Then, through the elastic action of the spring 4, the connection of the casing is further fixed, thereby effectively reducing the wear between the coupling and the pipe. While improving the service life of the coupling, it greatly reduces maintenance costs and replacement frequency.
[0025] Reference Figure 2 - Figure 4Following the method for connecting the lower coupling 2, the upper coupling 1 is tightly connected to the oil casing. A retaining sleeve 10 is provided inside the connecting lug 3. The connecting lug 3 of the upper coupling 1 is aligned with the connecting lug 3 of the lower coupling 2 until both the upper coupling 1 and the lower coupling 2 are tightly connected to the oil casing. A limit ring 11 is fixedly connected to the outer wall of the retaining sleeve 10. A connecting hole 9 is provided inside the connecting lug 3. During installation, the upper coupling 1 and the lower coupling 2 can be fixed by first inserting the retaining sleeve 10. The upper coupling 1 and the lower coupling 2 are connected to the connecting hole 9. The outer wall of the locking cylinder 10 is slidably connected to the inner wall of the connecting hole 9. The locking cylinder 10 has a second groove 12 inside. A second spring 13 is fixedly connected inside the locking cylinder 10. A locking block 14 is fixedly connected to one end of the second spring 13. The outer wall of the locking block 14 is slidably connected to the inner wall of the second groove 12. When inserted, the inner wall of the connecting hole 9 will squeeze the locking block 14, causing the locking block 14 to move into the second groove 12. At the same time, the second spring 13 will also be squeezed and contracted by the locking block 14. Until the limiting ring 11 on the outside of the locking cylinder 10 contacts the surface of the connecting ear 3, the locking block 14 slides out of the connecting hole 9. At this time, through the elastic action of the second spring 13, the locking block 14 is locked onto the surface of the connecting ear 3, thereby fixing the upper coupling 1 and the lower coupling 2.
[0026] Working principle: When using the device, first place the oil casing to be connected into the lower coupling 2 until the oil casing connection can be fully inserted into the fixing frame 6. At this time, the rubber pad 7 inside the fixing frame 6 will fully contact the casing joint. Since the rubber pad 7 is made of fluororubber, it has good corrosion resistance and high temperature resistance, which can better fill the small gap between the coupling and the casing, thereby effectively preventing the leakage of annular medium at the coupling. At the same time, the limiting groove 15 set by the rubber pad 7 can effectively prevent the pipe connection from shaking, playing a role in initial fixation and sealing. During the process of inserting the oil casing into the coupling, the oil casing connection will squeeze the fixing strip 8, causing the fixing strip 8 to move into the groove 5. During the movement of the fixing strip 8, the spring 4 will also be squeezed and contracted until the oil casing connection is fully inserted into the coupling. Then, through the elastic action of the spring 4, the casing connection is further fixed.
[0027] Following the same method, tightly connect the upper coupling 1 to the oil casing. During installation, align the connecting lug 3 of the upper coupling 1 with the connecting lug 3 of the lower coupling 2 until both the upper coupling 1 and the lower coupling 2 are tightly connected to the oil casing. At this point, the upper coupling 1 and the lower coupling 2 can be fixed. First, insert the snap-fit cylinder 10 into the connecting hole 9 of the upper coupling 1 and the lower coupling 2. During insertion, the inner wall of the connecting hole 9 will squeeze the snap-fit block 14, causing the snap-fit block 14 to move into the groove 12. At the same time, the spring 13 will also be squeezed and contracted by the snap-fit block 14 until the limiting ring 11 on the outside of the snap-fit cylinder 10 contacts the surface of the connecting lug 3. Then, the snap-fit block 14 will slide out of the connecting hole 9. At this point, through the elastic action of the spring 13, the snap-fit block 14 can be snapped onto the surface of the connecting lug 3, thus fixing the upper coupling 1 and the lower coupling 2.
[0028] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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. An outer sealing structure of a small coupling, comprising an upper coupling (1) and a lower coupling (2), characterized in that: The upper coupling (1) and the lower coupling (2) are fixedly connected with connecting ears (3), the inner wall of the lower coupling (2) is fixedly connected with a fixed frame (6), the inner wall of the fixed frame (6) is fixedly connected with a rubber pad (7), a groove one (5) is arranged in the lower coupling (2), and a fixing assembly is arranged in the lower coupling (2), which is used for further fixing the pipeline connection. The fixing assembly comprises a spring one (4), one end of the spring one (4) is fixedly connected in the lower coupling (2), and the other end of the spring one (4) is fixedly connected with a fixed strip (8), and the outer wall of the fixed strip (8) is slidably connected with the inner wall of the groove one (5).
2. An outer seal for a small coupling as defined in claim 1, wherein: The rubber pad (7) is internally provided with a limiting groove (15), which can prevent the pipeline connection from shaking.
3. An outer seal for a small coupling as defined in claim 1, wherein: The connecting ear (3) is internally provided with a clamping sleeve (10), and the outer wall of the clamping sleeve (10) is fixedly connected with a limiting ring (11).
4. An outer seal for a small coupling as defined in claim 3, wherein: The connecting ear (3) is internally provided with a connecting hole (9), and the outer wall of the clamping sleeve (10) is slidably connected with the inner wall of the connecting hole (9).
5. An outer seal for a small coupling as defined in claim 3, wherein: The clamping sleeve (10) is internally provided with a groove two (12), and the clamping sleeve (10) is fixedly connected with a spring two (13) internally.
6. An outer seal for a small coupling as defined in claim 5, wherein: One end of the spring two (13) is fixedly connected with a clamping block (14).
7. An outer seal for a small coupling as defined in claim 6, wherein: The outer wall of the clamping block (14) is slidably connected with the inner wall of the groove two (12).
8. An outer seal for a small coupling as defined in claim 1, wherein: The rubber pad (7) is made of fluorine rubber, which has good corrosion resistance and high temperature resistance.