A composite pipe connection joint

Abstract

This utility model discloses a composite pipe connection joint. The joint accurately positions the pipe and the seal through the first and second grooves of the front seal. The fixing part of the rear seal is inserted into the second groove in a semi-circular shape with interference fit, which completely eliminates the stress concentration leakage point caused by the slotting of the traditional flexible outer ring. It is especially suitable for high-pressure fluid transportation scenarios.

Description

Technical Field

[0001] This utility model relates to the field of pipe connection technology, and more specifically, to a composite pipe connection joint. Background Technology

[0002] Currently, flexible composite joints are an ideal choice for complex pipeline systems in chemical plants, oil refineries, and pharmaceutical factories, where there are highly corrosive media, temperature fluctuations, and equipment vibrations. Their chemical corrosion resistance is far superior to some metal joints, they can connect pipes of different materials, and they can compensate for equipment vibrations and thermal stresses.

[0003] On August 22, 2024, the State Intellectual Property Office published a patent application with publication number CN222925144U entitled "A Flexible Composite Pipe Joint Connection Structure." This patent application includes a first solution that achieves pipe connection through a fixed ring and two independently rotatable rotating rings on either side. Its core locking structure consists of a fixed inner ring and a semi-circular flexible outer ring on the rotating ring, forming an installation cavity to accommodate the pipe. The top of the flexible outer ring is initially locked to the pipe by a vertical plate and a first bolt. Protrusions on its inner wall enhance friction, and the slotted design allows a sliding movable structure on the fixed ring and its second bolt to extend into it, providing a secondary lock to the pipe. This structure effectively absorbs vibration and allows for independent installation.

[0004] However, the above-mentioned technical solutions are prone to stress concentration or bolt loosening under continuous high pressure fluid or severe vibration, which can lead to sealing failure, reduced locking reliability, and the risk of leakage or pipe detachment. Therefore, they do not meet the current requirements. In response, we propose a composite pipe connection joint. Utility Model Content

[0005] The purpose of this invention is to provide a composite pipe connector to solve the problems in the prior art where stress concentration or bolt loosening easily leads to sealing failure, reduced locking reliability, and the risk of leakage or pipe detachment under continuous high-pressure fluid or severe vibration.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a composite pipe connector, including a front pipe, a front sealing element at the end of the front pipe, a first groove and a second groove respectively provided on the end faces of both ends of the front sealing element, a third groove provided on the outer edge of the front sealing element, a rear sealing element including a base, the base abutting against the end face of the front sealing element where the second groove is formed, the end face of the base connected to the front sealing element extending into the second groove to form an interference fit fixing part, a limiting part and an inclined part provided at the end of the base away from the fixing part, an annular groove provided on the outer edge of the end of the base close to the fixing part, a first protrusion and a second protrusion provided on the inner wall of the housing, the first protrusion being embedded in the second groove, and the second protrusion being embedded in the annular groove.

[0007] The present invention is further configured such that: the end of the front seal away from the third groove has an inclined surface.

[0008] The present invention is further configured such that the inclined surface and the housing are connected by a thread.

[0009] The present invention is further configured such that: a plurality of movable parts are movably provided at the end of the housing away from the front seal, and the end of the movable parts away from the housing is constrained by a limiting member.

[0010] The present invention is further configured such that the limiting member is tubular.

[0011] The present invention is further configured such that the movable part and the limiting part are connected by a thread.

[0012] The present invention is further configured such that the limiting member is strip-shaped.

[0013] The present invention is further configured such that the ends of the limiting member are connected by bolts.

[0014] The present invention is further provided that: the surface of the inclined portion is provided with a rough layer.

[0015] The present invention is further configured such that the end of the fixing part away from the base is in the shape of a semi-circular ring.

[0016] In summary, this utility model has the following beneficial effects: The connector precisely positions the pipe and the seal through the first and second grooves of the front seal, and the fixing part of the rear seal is inserted into the second groove in a semi-circular shape, eliminating the stress concentration leakage points caused by the slotted outer ring of the traditional flexible ring, making it suitable for high-pressure fluid transportation. The first protrusion on the inner wall of the housing covering the front seal and the base is embedded in the second groove, and the second protrusion is embedded in the annular groove, forming a double physical sealing barrier, effectively preventing the intrusion of external corrosive media. The moving part is tightly fitted with the inclined part with a rough layer, and the stress is dispersed by friction in a vibration environment, replacing the manually adjusted second bolt in the first solution and avoiding the risk of pipe displacement caused by bolt loosening. The limiting part uniformly constrains the moving part, providing two anti-vibration locking options: the tubular limiting part radially presses the moving part through the thread, which is suitable for continuous high-pressure conditions; the strip-shaped limiting part flexibly adjusts the clamping force with the bolt to cope with pipeline systems with frequent vibration. The threaded connection between the inclined surface of the front seal and the housing further prevents axial slippage of the housing, ensuring the stability of the overall structure under extreme conditions. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the composite pipe connection joint in an embodiment of this utility model; Figure 2 This is a cross-sectional view of the composite pipe connection joint structure in the embodiment of this utility model; Figure 3This is a schematic diagram of the structure of the front seal in an embodiment of this utility model; Figure 4 This is a cross-sectional view of the front seal structure in an embodiment of this utility model; Figure 5 This is a schematic diagram of the structure of the rear seal in an embodiment of this utility model; Figure 6 This is a cross-sectional view of the rear seal structure in an embodiment of this utility model; Figure 7 This is a schematic diagram of the shell structure in an embodiment of this utility model; Figure 8 This is a cross-sectional view of the shell structure in an embodiment of this utility model.

[0018] In the figure: 1. Front tube; 2. Front seal; 21. First groove; 22. Second groove; 23. Third groove; 3. Rear seal; 31. Base; 32. Fixing part; 33. Inclined part; 34. Annular groove; 35. Limiting part; 4. Rear tube; 5. Housing; 51. Movable part; 52. First protrusion; 53. Second protrusion; 6. Limiting part. Detailed Implementation

[0019] The following is in conjunction with the appendix Figures 1-8 The present invention will be described in further detail below.

[0020] Example like Figure 1 , Figure 2 As shown, a composite pipe connector includes a front pipe 1, a front seal 2 on the front pipe 1, a rear seal 3 at the end of the front seal 2 away from the front pipe 1, and a rear pipe 4 at the end of the rear seal 3 away from the front seal 2. After the front seal 2 and the rear seal 3 are connected, a housing 5 is wrapped around their outer surfaces to protect both. A limiting member 6 is provided at the end of the housing 5 away from the front seal 2. The threads on the front pipe 1, rear pipe 4, front seal 2, and rear seal 3 are of the same specification, allowing them to be screwed together to ensure smooth assembly and reliable connection.

[0021] like Figure 1 - Figure 4 As shown, one end face of the front seal 2 is recessed inward to form a first groove 21 for mounting the front tube 1, and the first groove 21 has threads for fastening the front tube 1. The other end face of the front seal 2 is recessed inward to form a second groove 22 for fixing the rear seal 3. The outer edge of the end of the front seal 2 near the rear seal 3 has a third groove 23 for fixing the housing 5, and the third groove 23 is an annular groove surrounding the front seal 2. The end of the front seal 2 away from the third groove 23 has an inclined surface for preventing detachment. Preferably, this inclined surface is threadedly connected to the housing 5 to effectively prevent the housing 5 from sliding towards the rear seal 3.

[0022] like Figure 1 , Figure 2 , Figure 5 , Figure 6 As shown, the rear seal 3 includes a base 31, which abuts against the end face of the front seal 2 where the second groove 22 is formed. One end of the base 31 abutting against the front seal 2 extends into the second groove 22 to form a fixing part 32. The end of the fixing part 32 away from the base 31 is semi-circular and completely engages with the sealing end of the second groove 22, forming an interference fit to ensure no displacement after connection. The end of the base 31 away from the fixing part 32 is provided with a limiting part 35 for fixing the rear tube 4 and an inclined part 33 for restricting the movement of the housing 5. The limiting part 35 is threadedly connected to the rear tube 4, and the rear tube 4 needs to extend into the limiting part 35 to achieve the fixing effect. The outer edge of the end of the base 31 near the fixing part 32 is provided with an annular groove 34 to prevent the housing 5 from moving. The inclined part 33 is provided with a rough layer to increase the friction with the moving part 51 and prevent slippage.

[0023] like Figure 1 , Figure 2 , Figure 7 , Figure 8 As shown, the housing 5 completely covers the base 31 of the front seal 2 and the rear seal 3. Several movable members 51 are movably disposed at the end of the housing 5 away from the front seal 2. These movable members 51 can completely conform to the inclined portion 33 of the rear seal 3 and the rear tube 4. The ends of the movable members 51 away from the housing 5 are all constrained by limiting members 6 for fixing the movable members 51. The housing 5 is provided with a first protrusion 52 for embedding in the third groove 23 and a second protrusion 53 for embedding in the annular groove 34, achieving precise positioning of the housing 5 and the front and rear seals 3.

[0024] like Figure 1 , Figure 2 As shown, the limiting member 6 is tubular or strip-shaped. When the limiting member 6 is tubular, it is sleeved on the outside of the movable member 51 and fixed by a threaded connection to achieve the best fastening effect, ensuring that all movable members 51 are tightly fitted to the inclined part 33 and the rear tube 4. When the limiting member 6 is strip-shaped, its ends are connected by bolts, and the fit between the movable member 51 and the inclined part 33 and the rear tube 4 can be flexibly controlled by adjusting the tightness of the bolts. Preferably, the movable member 51 is provided with a protrusion for limiting the member, and the limiting member 6 is provided with a groove for fitting the protrusion on the movable member 51.

[0025] First, screw the front tube 1 into the first groove 21 and use its internal thread to achieve a tight connection. Then, insert the fixing part 32 of the rear seal 3 into the second groove 22, ensuring that the fixing part 32 is completely engaged with the sealing end of the second groove 22 to form an interference fit. At the same time, the base 31 of the rear seal 3 abuts against the end face of the front seal 2 where the second groove 22 is opened. Then, completely cover the base 31 of the front seal 2 and the rear seal 3 with the housing 5. The first protrusion 52, which is spaced apart inside the housing 5, is embedded in the third groove 23 of the front seal 2, and the second protrusion 53 is embedded in the annular groove 34 of the base 31 of the rear seal 3, to achieve the housing... The precise positioning of the housing 5 and the front and rear seals 3 effectively prevents the housing 5 from sliding towards the rear seal 3. After screwing the rear tube 4 into the limiting part 35, ensure that the rear tube 4 extends into the limiting part 35 to achieve fixation. Several movable parts 51, which are movably arranged at the end of the housing 5 away from the front seal 2, are completely attached to the inclined part 33 of the rear seal 3 and the fixed rear tube 4. The end of the movable part 51 away from the housing 5 is installed on the limiting part 6, which constrains all the movable parts 51 to fit tightly against the inclined part 33 and the rear tube 4. The rough layer on the inclined part 33 increases the friction with the movable part 51 to prevent slippage. The entire joint assembly is completed.

[0026] The front tube 1 and the rear tube 4 are reliably connected by their respective seals and housing 5. The internal channel is protected by the front and rear seals 3 that are screwed together and the precisely covered housing 5 to ensure the sealing and connection strength. The consistent thread specifications on all components ensure smooth assembly and reliable connection.

[0027] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A composite pipe connector, characterized in that: Includes a front tube (1), the end of which is provided with a front seal (2). The front seal (2) has a first groove (21) and a second groove (22) on its two end faces, and a third groove (23) on its outer edge. The rear seal (3) includes a base (31), which abuts against the end face of the front seal (2) where a second groove (22) is formed. The end face of the base (31) connected to the front seal (2) extends into the second groove (22) to form an interference fit fixing part (32). A limiting part (35) and an inclined part (33) are provided at the end of the base (31) away from the fixing part (32). A rear tube (4) is provided in the limiting part (35). An annular groove (34) is provided on the outer edge of the end of the base (31) near the fixing part (32). The inner wall of the housing (5) is provided with a first protrusion (52) and a second protrusion (53). The first protrusion (52) is embedded in the second groove (22), and the second protrusion (53) is embedded in the annular groove (34).

2. The composite pipe connector according to claim 1, characterized in that: The front seal (2) has an inclined surface at the end away from the third groove (23).

3. A composite pipe connector according to claim 2, characterized in that: The inclined surface is connected to the housing (5) by a thread.

4. A composite pipe connector according to claim 1, characterized in that: Several movable parts (51) are movably provided at the end of the housing (5) away from the front seal (2), and the end of the movable parts (51) away from the housing (5) is constrained by the limiting part (6).

5. A composite pipe connector according to claim 4, characterized in that: The limiting component (6) is tubular.

6. A composite pipe connector according to claim 5, characterized in that: The movable part (51) and the limiting part (6) are connected by threads.

7. A composite pipe connector according to claim 4, characterized in that: The limiting component (6) is strip-shaped.

8. A composite pipe connector according to claim 7, characterized in that: The limiting component (6) is connected at both ends by bolts.

9. A composite pipe connector according to claim 1, characterized in that: The inclined part (33) has a rough layer on its surface.

10. A composite pipe connector according to claim 1, characterized in that: The end of the fixing part (32) away from the base (31) is in the shape of a semi-circular ring.

Images