Intermediate joint for flexible composite pipe

Abstract

The present application relates to a kind of intermediate joints for flexible composite pipe, including two inner core pipes, two outer sleeve pipes and composite pipe between inner core pipe and outer sleeve pipe, one end of the outer sleeve pipe is threadedly connected with connecting piece, the connecting piece includes connecting pipe, sealing assembly is arranged in the connecting pipe, the outer sleeve pipe is fixedly provided with engagement assembly, exhaust assembly is also provided on the connecting pipe, the sealing assembly is used to seal the junction of outer sleeve pipe and connecting pipe under the cooperation of engagement assembly when gas leaks, the exhaust assembly is used to discharge a large amount of leaked gas, prevent the pipe body from bursting due to too much gas in the pipe, improve the sealing between outer sleeve pipe and connecting piece, solve the problem that the original outer sleeve pipe and connecting piece need to be welded, so that the welding part is corroded due to long-term use and the sealing of the welding part is poor.

Description

Technical Field

[0001] This invention relates to the field of composite pipe connection technology, and more specifically to an intermediate joint for flexible composite pipes. Background Technology

[0002] Flexible composite pipes can be classified into oil pipeline composite pipes, gas pipeline composite pipes, etc. according to their uses. Flexible composite pipes have certain characteristics such as high strength, high pressure and high corrosion resistance. When connecting flexible composite pipes, intermediate joints are usually required for connection. The intermediate joints are required to have good sealing performance and ensure the flow of leaked media.

[0003] However, existing intermediate joints for composite pipes often experience corrosion at the welded parts after long-term use, and the sealing of the welded parts is poor, leading to leakage of the medium inside the pipe. In addition, the existing vent holes are directly opened on the outer surface of the outer sleeve, which can be blocked by foreign objects entering the vent holes or deformed by external forces, affecting the venting effect. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a flexible composite pipe intermediate joint. This joint involves threading an outer sleeve onto the inner core pipe, then threading a connecting pipe onto the outer sleeve. The two connectors are fixed together using connecting bolts and nuts. Assembly is convenient and requires no welding. This solves the problems of corrosion caused by long-term use of welded joints and poor sealing leading to leakage of the pipe's internal medium. By incorporating ventilation channels, connecting channels, and exhaust holes, leaked gas is discharged from the pipe, preventing excessive leakage from causing pipe bursts. Furthermore, it avoids problems such as blockage and deformation of the exhaust holes.

[0005] The technical solution of the present invention is as follows: A flexible composite pipe intermediate joint includes two inner core tubes, two outer sleeves, and a composite pipe located between the inner core tubes and the outer sleeves. One end of the outer sleeve is threadedly connected to a connector, the connector including a connecting pipe, a sealing component disposed inside the connecting pipe, a locking component fixedly disposed on the outer sleeve, and a venting component disposed on the connecting pipe. The sealing component is used to seal the connection between the outer sleeve and the connecting pipe in the event of gas leakage, with the cooperation of the locking component. The venting component is used to discharge a large amount of leaked gas.

[0006] As a preferred embodiment, the connector further includes a fastening plate fixedly disposed at one end of the connecting pipe, a plurality of through holes formed on the fastening plate, and a thread disposed at the connecting end of the connecting pipe. A connecting bolt is installed in the through hole, and a fastening nut is threaded onto both ends of the connecting bolt. The two fastening plates are fixedly connected by the connecting bolt and the connecting nut.

[0007] As a preferred embodiment, the outer sleeve is provided with a ventilation channel.

[0008] As a preferred embodiment, the sealing assembly includes a connecting channel formed within the connecting pipe and a rubber ring slidably disposed within the connecting channel, wherein the front diameter of the rubber ring is smaller than the rear diameter, and the connecting channel is connected to the ventilation channel.

[0009] As a preferred embodiment, the engaging assembly includes a protrusion fixedly disposed on the outer sleeve, a sealing groove a formed in the protrusion, and a spring fixedly connected in the sealing groove a, wherein the sealing groove a is adapted to the front end of the rubber ring.

[0010] As a preferred embodiment, the exhaust assembly includes an exhaust port formed on the connecting pipe, the exhaust port communicating with the connecting channel.

[0011] As a preferred embodiment, one end of the inner core tube is provided with a sealing groove b for installing a sealing ring, and the other end of the inner core tube is provided with a limiting block, and the sealing groove b is provided with at least two.

[0012] As a preferred embodiment, the outer surface of the inner core tube is provided with external teeth, the inner surface of the outer tube is provided with internal teeth, the connecting end of the outer tube is provided with threads, and the connecting end of the outer tube mates with the connecting end of the connecting tube. The shape of the external teeth and internal teeth can be sawtooth or conical. In this invention, the external teeth and internal teeth are set to sawtooth shape in order to improve the pull-out resistance of the composite tube.

[0013] As a preferred embodiment, the rubber ring is fitted with the vent hole.

[0014] As another preferred option, the sealing ring is made of rubber.

[0015] The beneficial effects of this invention are as follows: 1. This invention comprises an inner core tube, an outer sleeve, and a connector. The outer sleeve is threaded onto the inner core tube, and the composite tube is inserted into the gap between the inner core tube and the outer sleeve. A limiting block limits the insertion depth of the composite tube, preventing an interference fit between the composite tube and the inner core tube and the outer sleeve. The connecting tube is fixed by being threaded onto the outer sleeve. This method improves the sealing performance between the connecting tube and the outer sleeve, and is easy to assemble without welding, solving the problems of corrosion and poor sealing at welded joints after long-term use.

[0016] The present invention also includes a sealing component, a locking component, and an exhaust component. When the amount of gas leakage at the gap between the outer tube, the inner core tube, and the composite tube is small, the leaked gas pushes the rubber ring into the sealing groove a, thereby performing a secondary seal on the connecting tube and the outer tube. When the amount of leaked gas is large, the gas continues to push the rubber ring to separate the rubber ring from the exhaust hole, so that the exhaust hole is in an open state, and a large amount of leaked gas can be quickly discharged from the exhaust hole, preventing the tube body from bursting due to excessive gas in the gap between the composite tube, the outer tube, and the inner core tube.

[0017] In summary, the present invention has the advantages of convenient assembly and good sealing performance, and is suitable for the field of composite pipe connection technology. Attached Figure Description

[0018] The invention will be further described below with reference to the accompanying drawings: Figure 1 For use as intermediate joints in flexible composite pipes; Figure 2 This is a cross-sectional schematic diagram of the outer tube, inner core tube, composite tube, and connectors; Figure 3 for Figure 2 Enlarged view of point A; Figure 4 A schematic diagram showing the state when the gas leakage inside the pipe is small, and the connecting pipe and the outer sleeve are sealed a second time; Figure 5 This is a schematic diagram showing the state of gas being discharged from the vent when there is a large amount of gas leaking from inside the pipe. Detailed Implementation

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0020] Example 1 Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0021] like Figures 1 to 5As shown, a flexible composite pipe intermediate joint includes two inner core tubes 1, two outer sleeves 2, and a composite pipe 3 located between the inner core tubes 1 and the outer sleeves 2. One end of the outer sleeve 2 is threadedly connected to a connector 4. The connector 4 includes a connecting pipe 41, a sealing component 5 is provided inside the connecting pipe 41, a locking component 6 is fixedly provided on the outer sleeve 2, and an exhaust component 7 is also provided on the connecting pipe 41. The sealing component 5 is used to seal the connection between the outer sleeve 2 and the connecting pipe 41 in the event of gas leakage, with the cooperation of the locking component 6. The exhaust component 7 is used to discharge a large amount of leaked gas.

[0022] like Figure 1 and 2 As shown, the connector 4 also includes a fastening plate 42 fixedly disposed at one end of the connecting pipe 41, several through holes 43 opened on the fastening plate 42, and a thread disposed at the connecting end of the connecting pipe 41. A connecting bolt 44 is installed in the through hole 43, and a fastening nut 45 is threaded onto both ends of the connecting bolt 44. The two fastening plates 42 are fixedly connected by the connecting bolt 44 and the connecting nut 45. In use, firstly, the inner core tube 1 and the outer sleeve tube 2 are fixedly connected by threaded connection. Then, the composite tube 3 is placed between the outer sleeve tube 2 and the inner core tube 1. The composite tube 3 is clamped by the outer sleeve tube 2 and the inner core tube 1 by crimping. The composite tube 3 is then clamped between the two. Then, the connecting pipe 41 is threadedly connected to the outer sleeve tube 2, so that the connecting pipe 41 is fixed to the outer sleeve tube 2. At this time, the two fastening plates 42 are close together and fixed by the connecting bolt 44 and the fastening nut 45. This structure is easy to assemble and has better sealing performance.

[0023] like Figure 3 As shown, the outer tube 2 is provided with a ventilation channel 51, which is used to discharge the gas in the gap between the outer tube 2, the inner core tube 1 and the composite tube 3, so as to prevent the tube body from rupturing due to excessive air pressure in the gap.

[0024] like Figure 3As shown, the sealing assembly 5 includes a connecting channel 54 opened in the connecting pipe 41 and a rubber ring 52 slidably disposed in the connecting channel 54. The front diameter of the rubber ring 52 is smaller than the rear diameter. The connecting channel 54 is connected to the ventilation channel 51. During use, when there is minimal gas leakage at the gap between the outer sleeve 2, inner core tube 1, and composite tube 3, the leaked gas enters the ventilation channel 51 and connecting channel 54, pushing the rubber ring 52 into the sealing groove a62. This causes the surface of the rubber ring 52 to adhere to the surface of the sealing groove a62, thereby improving the sealing effect between the connecting tube 41 and the outer sleeve 2. When there is significant gas leakage at the gap between the outer sleeve 2, inner core tube 1, and composite tube 3, the leaked gas continues to push the rubber ring 52, causing it to detach from the vent hole 71. This allows the gas to escape from the vent hole 71, preventing excessive gas accumulation in the connecting tube 41 and thus preventing it from bursting. Furthermore, by setting the shape of the rubber ring 52 such that the front diameter is smaller than the rear diameter and the cross-sectional shape of the rubber ring 52 is trapezoidal, the friction between the front end of the rubber ring 52 and the ventilation channel 51 is reduced, thereby reducing the resistance during the movement of the rubber ring 52. This allows the rubber ring 52 to enter the sealing groove a more quickly and seal the connecting tube 41 and the outer sleeve 2.

[0025] like Figure 3 As shown, the engaging assembly 6 includes a protrusion 61 fixedly mounted on the outer sleeve 2, a sealing groove a62 formed within the protrusion 61, and a spring 63 fixedly connected within the sealing groove a62. The sealing groove a62 is adapted to the front end of the rubber ring 52. In use, when the rubber ring 52 enters the sealing groove a62 while being pushed by gas, the spring 63 is compressed. When the rubber ring 52 is freed from the gas compression, the spring 63 is released, and the rubber ring 52 disengages from the sealing groove a62.

[0026] like Figure 3 As shown, the exhaust assembly 7 includes an exhaust port 71 on the connecting pipe 41, which communicates with the connecting channel 54. During use, when excessive gas leaks from the gap between the outer sleeve 2, inner core tube 1, and composite pipe 3, the gas pushes the rubber ring 52, causing it to separate from the exhaust port 71. The exhaust port 71 then opens, allowing the leaked gas to escape, preventing the connecting pipe 41 from bursting due to excessive gas. Furthermore, the transverse exhaust port 71 prevents blockage of the exhaust port 71 and connecting channel 54 caused by foreign objects entering, and the exhaust port 71 will not deform under external force, thus affecting the exhaust effect.

[0027] like Figure 2As shown, one end of the inner core tube 1 is provided with a sealing groove b81 for installing the sealing ring 8, and the other end of the inner core tube 1 is provided with a limiting block 82. The sealing groove b81 is provided with at least two. By providing the sealing ring 8, the sealing performance at the connection between the outer tube 2 and the composite tube 3 is improved, reducing gas leakage. By providing the limiting block 82, the insertion position of the composite tube 3 is limited, preventing the composite tube 3 from being interference-fitted with the inner core tube 1 and the outer tube 2.

[0028] like Figure 2 As shown, the outer surface of the inner core tube 1 is provided with external teeth 11, the inner surface of the outer sleeve tube 2 is provided with internal teeth 21, and the connecting end of the outer sleeve tube 2 is provided with threads. The connecting end of the outer sleeve tube 2 mates with the connecting end of the connecting pipe 41. This connection method eliminates the need for welding of the connecting parts, avoiding corrosion of the welded parts after long-term use, and the welding parts have poor sealing performance. The connection method proposed in this solution improves the sealing performance between the inner core tube 1, the composite tube 3, and the outer sleeve tube 2, and improves the sealing performance between the outer sleeve tube 2 and the connecting pipe 41.

[0029] like Figure 3 As shown, the rubber ring 52 mates with the vent hole 71. When there is less gas in the connecting channel 54, the gas pushes the rubber ring 52 into the sealing groove a62, improving the sealing between the outer sleeve 2 and the inner core tube 1. When there is more gas in the connecting channel 54, the surface of the rubber ring 52 separates from the vent hole 71, and the gas is discharged through the vent hole 71, preventing the connecting pipe 41 from bursting due to excessive gas.

[0030] Example 2 like Figure 2 As shown, the components that are the same as or corresponding to those in Embodiment 1 are marked with the same reference numerals as those in Embodiment 1. For the sake of simplicity, only the differences from Embodiment 1 will be described below. The difference between Embodiment 2 and Embodiment 1 is that the sealing ring 8 is made of rubber.

[0031] In this embodiment, by setting the sealing ring 8 to a rubber material, the sealing performance of the sealing groove b81 is improved, so that the composite tube 3 is completely pressed with the inner core tube 1 and the outer sleeve tube 2, thereby achieving a sealed and anti-pull-out connection between the composite tube 3 and the inner core tube 1 and the outer sleeve tube 2.

[0032] In the description of this invention, it should be understood that the terms "front and back", "left and right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0033] Of course, those skilled in the art should understand that the term "a" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. The term "a" should not be understood as a limitation on the number.

[0034] The above description, in conjunction with the accompanying drawings, is merely a preferred embodiment of the present invention. However, the present invention is not limited to the above-described embodiments. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention. These modifications and improvements should also be considered within the scope of protection of the present invention and will not affect the effectiveness and practicality of the present invention.

Claims

1. A flexible composite pipe intermediate joint, comprising two inner core tubes (1), two outer sleeves (2), and a composite pipe (3) located between the inner core tubes (1) and the outer sleeves (2), characterized in that: One end of the outer tube (2) is threadedly connected to a connector (4), the connector (4) includes a connecting tube (41), a sealing component (5) is provided inside the connecting tube (41), a locking component (6) is fixedly provided on the outer tube (2), and an exhaust component (7) is also provided on the connecting tube (41). The sealing component (5) is used to seal the connection between the outer tube (2) and the connecting tube (41) in the presence of the locking component (6) when gas leaks. The exhaust component (7) is used to discharge a large amount of leaked gas. The outer sleeve (2) is provided with a ventilation channel (51); The sealing assembly (5) includes a connecting channel (54) opened in the connecting pipe (41) and a rubber ring (52) slidably disposed in the connecting channel (54). The front diameter of the rubber ring (52) is smaller than the rear diameter. The connecting channel (54) is connected to the ventilation channel (51). The engaging assembly (6) includes a protrusion (61) fixedly mounted on the outer sleeve (2), a sealing groove a (62) opened in the protrusion (61), and a spring (63) fixedly connected in the sealing groove a (62). The sealing groove a (62) is adapted to the front end of the rubber ring (52). The exhaust assembly (7) includes an exhaust port (71) opened on the connecting pipe (41), and the exhaust port (71) is connected to the connecting channel (54).

2. The intermediate joint for flexible composite pipe according to claim 1, characterized in that: The connector (4) also includes a fastening plate (42) fixedly disposed at one end of the connecting pipe (41), a plurality of through holes (43) opened on the fastening plate (42), and a thread disposed at the connecting end of the connecting pipe (41). A connecting bolt (44) is installed in the through hole (43), and a fastening nut (45) is threaded onto both ends of the connecting bolt (44). The two fastening plates (42) are fixedly connected by the connecting bolt (44) and the connecting nut (45).

3. The intermediate joint for flexible composite pipe according to claim 1, characterized in that: One end of the inner core tube (1) is provided with a sealing groove b (81) for installing a sealing ring (8), and the other end of the inner core tube (1) is provided with a limiting block (82). There are at least two sealing grooves b (81).

4. The intermediate joint for flexible composite pipe according to claim 1, characterized in that: The outer surface of the inner core tube (1) is provided with external teeth (11), the inner surface of the outer tube (2) is provided with internal teeth (21), the connecting end of the outer tube (2) is provided with threads, and the connecting end of the outer tube (2) is matched with the connecting end of the connecting tube (41).

5. The intermediate joint for flexible composite pipe according to claim 1, characterized in that: The rubber ring (52) is fitted with the vent hole (71).

6. The intermediate joint for flexible composite pipe according to claim 3, characterized in that: The sealing ring (8) is made of rubber.

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