Double-wall pipe connecting device

Abstract

The invention relates to the technical field of double-wall pipe connection, in particular to a double-wall pipe connecting device which comprises an outer pipe and an inner pipe and further comprises an assembly disc, a first flange and a second flange, the first flange and the second flange are arranged on the outer walls of the two sides of the assembly disc, the second flange is located on the periphery of the first flange, and an assembly groove is formed between the first flange and the second flange. The inner pipe is allowed to be inserted into the assembling groove; after butt joint, the outer walls of the first flanges are inserted into the two inner pipes correspondingly. An annular groove is formed in the assembling disc, the central axis of the annular groove, the central axis of the inner pipe and the central axis of the assembling disc are collinear, a plurality of inclined grooves are formed in the inner walls of the two assembling grooves correspondingly, the two ends of each inclined groove communicate with the annular groove and the corresponding assembling groove correspondingly, and reaction rods are slidably installed in the inclined grooves correspondingly. By means of the butt joint device, butt joint and communication between the inner pipes can be easily completed, and the butt joint quality can be detected.

Description

Technical Field

[0001] The present invention relates to the technical field of double-wall pipe connection, in particular to a double-wall pipe connection device. Background Art

[0002] Double-wall pipes, due to their unique double-layer structural design, play an important role in many fields. For example, in the chemical and petroleum industries, and the special gas or liquid transmission industries, the application of double-wall pipes is expanding to emerging fields such as hydrogen energy storage and transportation, semiconductor manufacturing, etc. with technological advances, and continues to meet high safety and high efficiency requirements. Since double-wall pipes have inner and outer tubes, the docking and connection of the inner tube is the most important.

[0003] In existing technology, the inner tubes of double-walled pipes are typically connected using flanges or clamps, with a sealant filling the middle. Due to the weight and length limitations of double-walled pipes, misalignment is prone to occur when the two double-walled pipes are connected. While flanges and clamps can achieve docking and locking, this relies on the flexible deformation of the seal, which can cause the seal to compress to varying degrees in various locations. In complex environments, the probability of seal failure increases, impacting the integrity of the pipeline. Summary of the Invention

[0004] The present invention provides a double-wall pipe connecting device, which can easily complete the docking and connection between inner pipes and can also detect the docking quality.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A double-wall pipe connecting device, comprising: an outer pipe and an inner pipe, and further comprising:

[0007] The first flange and the second flange on the outer wall of the assembly disk and both sides thereof, the second flange is located on the periphery of the first flange, and an assembly groove is formed between the first flange and the second flange, and the assembly groove allows the inner tube to be inserted; after docking, the outer wall of the first flange is respectively inserted into the interior of the two inner tubes; an annular groove is provided inside the assembly disk, and the central axis of the annular groove, the inner tube and the assembly disk are in a collinear relationship, and the inner walls of the two assembly grooves are provided with multiple oblique grooves, and the two ends of the oblique groove are respectively connected to the annular groove and the assembly groove, and reaction rods are slidably installed in the oblique grooves. When not docked, the two ends of the reaction rod are respectively inserted into the assembly groove and the annular groove. When the inner tube and the assembly groove are docked, the reaction rod is forced to displace and displaced into the annular groove. A detection structure for detecting the position state of each reaction rod is installed inside the annular groove; when the positions of the multiple reaction rods are all in the correct position, it is determined that the docking between the inner tube and the assembly groove is correct.

[0008] Optionally, the multiple inclined grooves located in the same assembly groove are distributed in a circumferential array of the outer tube, and the multiple inclined grooves in the two assembly grooves are symmetrical with the annular groove. The detection structure includes a bearing seat installed inside the annular groove, and a linkage plate is rotatably installed on the bearing seat. The two ends of the linkage plate are respectively hinged with the ends of the two nearest symmetrically distributed reaction rods with pneumatic support rods. The rotation point of the linkage plate is located on the mid-vertical line between the two reaction rods. The linkage plate is designed with a reaction structure for measuring the horizontality of the linkage plate. When the two inner tubes are correctly docked with the assembly grooves, the two reaction rods will limit the linkage plate to a horizontal state through the pneumatic support rod, and the horizontal line is parallel to the central axis of the inner tube. If the displacement of one of the reaction rods deviates, the linkage plate will tilt.

[0009] Optionally, the reaction structure includes a laser emitter fixedly mounted on the outer wall of the linkage plate, the light emitted by the laser emitter is perpendicular to the surface of the linkage plate, a light transmission hole is provided on the inner wall of the annular groove, the axis of the light transmission hole is collinear with the radial line of the annular groove, a laser receiver is installed inside the light transmission hole, when the light emitted by the laser emitter passes through the light transmission hole and is received by the laser receiver, it can be determined that the horizontal line of the linkage plate is now parallel to the center axis of the annular groove.

[0010] Optionally, a supporting plate is installed between the outer wall of the inner tube and the inner wall of the outer tube. When the inner tube is correctly docked with the assembly groove, a sealed test space is formed between the supporting plate, the outer tube, the inner tube and the assembly disk. The outer wall of the assembly disk is provided with a piston cavity, which intersects with the light transmission hole. A piston partition is slidably installed inside the piston cavity. A light leakage hole is opened through the outer wall of the piston partition. An elastic member is installed between the piston partition and the inner wall of the piston cavity. The elastic member limits the piston partition to an initial position. The light leakage hole is located inside the piston partition and is coaxially distributed. If the seal between the assembly groove and the inner tube fails, the high-pressure gas inside the inner tube will leak into the test space. The increase in internal pressure of the test space will drive the piston partition to move. At this time, the piston partition blocks the light transmission hole and blocks the light propagation of the laser emitter.

[0011] Optionally, the reaction structure includes an electronic level fixedly mounted on the surface of the linkage plate, and the electronic level can transmit the angle value to an external digital display structure.

[0012] Optionally, a valve stem is rotated on the inner wall of the annular groove, and the valve stem extends into the interior of the first flange. A valve plate is fixedly installed on the outer wall of the first flange, and an actuator is fixedly installed on the inner wall of the annular groove. The output end of the actuator is transmission-connected to the valve stem, and the rotation axis of the first flange is collinear with the radial line of the assembly disk.

[0013] Optionally, an annular groove is provided on the circumferential outer wall of the valve plate, an O-ring is installed in the groove, and the O-ring is made of fluororubber.

[0014] Optionally, a plurality of sealing clamps are embedded and installed on the inner wall of the assembly groove.

[0015] Optionally, a flange ring is installed on the outer wall of the outer tube, the diameter of the assembly plate is larger than the outer diameter of the flange ring, and the flange ring can be fixed to the outer wall of the annular groove by bolts.

[0016] The present invention provides a double-wall pipe connection device, which has the following beneficial effects compared with the prior art:

[0017] 1. The first flange and the second flange cooperate to form an assembly groove. When the inner tube wall is inserted, it will press the reaction rod, causing the reaction rod to move. By designing multiple reaction rods, the docking status of each part of the inner tube can be known, thereby effectively assisting the docking accuracy between the inner tubes and improving the docking quality.

[0018] Second, by designing the coordination between the reaction structure and the linkage plate, the status of the linkage plate can be detected optically. Only when the linkage plate is in a horizontal state, the laser emitted by the laser transmitter will be received by the laser receiver, and the docking quality of the inner tube can be detected optically.

[0019] 3. If the sealing effect between the inner tube and the assembly groove is reduced, the high-pressure gas transported inside the inner tube will leak and transfer to the test space. The air pressure inside the test space and the piston cavity will increase, which will push the piston partition to move, causing the light leakage hole and the light transmission hole to be misaligned, making it impossible for the laser receiver to receive the light emitted from the laser transmitter, thereby monitoring the sealing failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the connection between two double-walled tubes and an assembly plate in the present invention;

[0021] Figure 2 It is a structural schematic diagram of the assembly disk in the present invention;

[0022] Figure 3 For the present invention Figure 2 Schematic diagram of the right view structure;

[0023] Figure 4 For the present invention Figure 3 Schematic diagram of the structure viewed from the AA position;

[0024] Figure 5 For the present invention Figure 4 A magnified view of the structure at B in the middle;

[0025] Figure 6 Schematic diagram of the internal structure of the assembly disk in the present invention.

[0026] In the figure: 1. Outer tube; 2. Inner tube; 3. Assembly disk; 4. First flange; 5. Second flange; 6. Annular groove; 7. Light transmission hole; 8. Reaction rod; 9. Air pressure support rod; 11. Linkage plate; 12. Laser emitter; 13. Sealing clamp; 14. Carrying plate; 16. Piston chamber; 17. Piston partition; 18. Light leakage hole; 19. Laser receiver; 20. Valve plate; 21. Actuator; 22. Valve stem. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] See also Figures 1 to 6 The present invention provides a technical solution: a double-wall pipe connection device, including an outer pipe 1 and an inner pipe 2, and further comprising:

[0029] The first flange 4 and the second flange 5 on the outer wall of the assembly disk 3 and both sides thereof, the second flange 5 is located at the periphery of the first flange 4, and an assembly groove is formed between the first flange 4 and the second flange 5, which allows the inner tube 2 to be inserted; after docking, the outer wall of the first flange 4 is respectively inserted into the interior of the two inner tubes 2; an annular groove 6 is provided inside the assembly disk 3, and the central axis of the annular groove 6, the inner tube 2 and the assembly disk 3 are in a collinear relationship. The inner walls of the two assembly grooves are provided with a plurality of inclined grooves, and the two ends of the inclined groove are respectively connected to the annular groove 6 and the assembly groove. A reaction rod 8 is slidably installed in the inclined groove. When not docked, the two ends of the reaction rod 8 are respectively inserted into the assembly groove and the annular groove 6. When the inner tube 2 is docked with the assembly groove, the reaction rod 8 is forced to displace and displace internally toward the annular groove 6. A detection structure for detecting the position state of each reaction rod 8 is installed inside the annular groove 6; when the positions of the plurality of reaction rods 8 are all in the correct position, it is determined that the docking between the inner tube 2 and the assembly groove is correct.

[0030] In the prior art, the inner tube of the double-walled tube can be docked and locked using a clamp or a flange, but it is easy to become dislocated. Using a sealing ring to compensate for the dislocation may result in sealing failure in subsequent use, causing transportation accidents, especially when the application environment of the double-walled tube is more demanding. In the present invention, an assembly groove is formed by the cooperation between the first flange 4 and the second flange 5, so that the tube wall of the inner tube 2 can be extended into the assembly groove. During the extension process, the tube wall of the inner tube 2 will cause pressure on the reaction rod 8, causing the reaction rod 8 to be displaced. By designing multiple reaction rods 8, the docking status of each part of the inner tube 2 can be known, thereby effectively assisting the docking accuracy between the inner tubes 2 and improving the docking quality.

[0031] In the present invention, the assembly disk 3 acts as an intermediary, and both inner tubes 2 are docked with the assembly groove, while the interior of the first flange 4 serves as a pipeline communication support structure. Therefore, it does not affect the normal operation of the inner tube 2 and can improve the docking quality.

[0032] Among them, a more preferred embodiment is that the multiple inclined grooves located in the same assembly groove are distributed in a circumferential array of the outer tube 1, and the multiple inclined grooves in the two assembly grooves are symmetrical with the annular groove 6. The detection structure includes a bearing seat installed inside the annular groove 6, and a linkage plate 11 is rotatably installed on the bearing seat. The two ends of the linkage plate 11 are respectively hinged with the ends of the two nearest symmetrically distributed reaction rods 8 with pneumatic support rods 9. The rotation point of the linkage plate 11 is located on the mid-vertical line between the two reaction rods 8. A reaction structure for measuring the horizontality of the linkage plate 11 is designed on the linkage plate 11. When the two inner tubes 2 are correctly docked with the assembly grooves, the two reaction rods 8 will limit the linkage plate 11 to a horizontal state through the pneumatic support rods 9, and the horizontal line is parallel to the central axis of the inner tube 2. If the displacement of one of the reaction rods 8 deviates, the linkage plate 11 will tilt.

[0033] See also Figures 3 to 6 In this embodiment, any detection structure includes two reaction rods 8, two gas pressure support rods 9 and a linkage plate 11. The reaction rods 8 and the gas pressure support rods 9 are symmetrically distributed with the linkage plate 11 as the symmetry axis. The initial air pressure and output of the two gas pressure support rods 9 are the same. Therefore, when the two reaction rods 8 are in the same position or symmetrically distributed along the linkage plate 11, the compression amount of the gas pressure support rods 9 is consistent, thereby maintaining the linkage plate 11 in a horizontal state by utilizing the air pressure balance of the two gas pressure support rods 9. On the contrary, if the positions of the reaction rods 8 are different, the compression amount of the gas pressure support rods 9 is also different, which will cause the linkage plate 11 to tilt, thereby judging that the docking of the inner tube 2 with the assembly groove is inconsistent. During the docking process, the extension amount of the inner tube 2 can be judged by a measuring instrument, thereby ensuring that the docking of the inner tube 2 with the assembly groove is consistent and the docking depth is sufficient, thereby improving the quality of the docking of the inner tube 2.

[0034] Two examples of reaction structures are provided below.

[0035] Example 1:

[0036] The reaction structure includes a laser emitter 12 fixedly mounted on the outer wall of the linkage plate 11. The light emitted by the laser emitter 12 forms a perpendicular relationship with the surface of the linkage plate 11. The inner wall of the annular groove 6 is provided with a light transmission hole 7. The axis of the light transmission hole 7 is collinear with the radial line of the annular groove 6. A laser receiver 19 is installed inside the light transmission hole 7. When the light emitted by the laser emitter 12 passes through the light transmission hole 7 and is received by the laser receiver 19, it can be determined that the horizontal line of the linkage plate 11 is now parallel to the central axis of the annular groove 6. In this embodiment, the linkage plate 11, the laser emitter 12, the light transmission hole 7 and the laser receiver 19 are connected. The cooperation between the input hole 7 and the laser receiver 19 can detect the status of the linkage plate 11 in an optical manner. Only when the linkage plate 11 is in a horizontal state, the laser emitted by the laser transmitter 12 will be received by the laser receiver 19, which is equivalent to setting a uniqueness for the horizontal level of the linkage plate 11. In addition, the reaction structure can also be used as a monitoring device. When used for a long time, if it is affected by impact or other external factors, the inner tube 2 may be dislocated. At this time, the reaction rod 8 will be displaced, causing the linkage plate 11 to tilt, thereby playing a monitoring and warning role.

[0037] On the basis of the reaction structure embodiment, a supporting plate 14 is installed between the outer wall of the inner tube 2 and the inner wall of the outer tube 1. When the inner tube 2 is correctly docked with the assembly groove, a sealed test space is formed between the supporting plate 14, the outer tube 1, the inner tube 2 and the assembly disk 3. The outer wall of the assembly disk 3 is provided with a piston cavity 16, which intersects with the light transmission hole 7. A piston partition 17 is slidably installed inside the piston cavity 16. A light leakage hole 18 is penetrated through the outer wall of the piston partition 17. An elastic member is installed between the piston partition 17 and the inner wall of the piston cavity 16. The elastic member limits the piston partition 17 to an initial position. The light leakage hole 18 is located inside the piston partition 17 and is coaxially distributed. If the seal between the assembly groove and the inner tube 2 fails, the high-pressure gas inside the inner tube 2 will leak into the test space. The increase in the internal pressure of the test space will drive the piston partition 17 to move. At this time, the piston partition 17 blocks the light transmission hole 7, blocking the propagation of light from the laser emitter 12. Please refer to Figure 4 And its detailed enlarged view, in this embodiment, when used for a long time, if the sealing effect between the inner tube 2 and the assembly groove is reduced, the high-pressure gas transported inside the inner tube 2 will leak and transfer to the test space, and the air pressure in the test space will increase, that is, the air pressure inside the piston cavity 16 will increase, thereby pushing the piston partition 17 to move, so that the light leakage hole 18 and the light transmission hole 7 are misaligned, so that the laser receiver 19 cannot receive the light emitted from the laser emitter 12.

[0038] The carrier sheet 14 can also improve the robustness between the outer tube 1 and the inner tube 2 .

[0039] Example 2:

[0040] The reaction structure includes an electronic level fixedly mounted on the surface of the linkage plate 11. The electronic level can transmit the angle value to the external digital display structure. Compared with the first embodiment, the use of the electronic level is more intuitive and convenient for observation and adjustment.

[0041] In a more preferred embodiment, a valve stem 22 is rotated on the inner wall of the annular groove 6, and the valve stem 22 extends into the interior of the first flange 4. A valve plate 20 is fixedly mounted on the outer wall of the first flange 4. An actuator 21 is fixedly mounted on the inner wall of the annular groove 6. The output end of the actuator 21 is transmission-connected to the valve stem 22. The rotation axis of the first flange 4 is collinear with the radial line of the assembly disk 3. Figure 6 As shown in the enlarged view of its details, in this embodiment, when a sealing failure occurs, the actuator 21 drives the valve stem 22 and the valve plate 20 to rotate, thereby using the valve plate 20 to isolate the first flange 4 into two parts to protect the input device.

[0042] Furthermore, an annular groove is provided on the circumferential outer wall of the valve plate 20 , in which an O-ring is installed. The O-ring is made of fluororubber, and the combination of the groove and the O-ring can improve the isolation effect.

[0043] Furthermore, multiple sealing rings 13 are embedded on the inner wall of the assembly groove to provide multi-layer sealing for the inner tube 2, thereby improving the sealing ability between the inner tube 2 and the assembly groove. Secondly, it can also improve the accuracy of testing seal loss.

[0044] Furthermore, a flange ring is installed on the outer wall of the outer tube 1 , and the diameter of the assembly plate 3 is larger than the outer diameter of the flange ring. The flange ring can be fixed to the outer wall of the annular groove 6 by bolts.

[0045] By utilizing the cooperation of the above structures, the docking and connection between the inner tubes 2 can be easily completed, and the docking quality can also be tested.

[0046] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural components recorded in the specification and drawings can also be directly processed according to existing technical common sense without any doubt. At the same time, the connection method of each component adopts the mature conventional means in the existing technology, and the machinery, parts and equipment all adopt conventional models in the existing technology, so no specific description is given here.

[0047] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A double-wall pipe connection device, comprising: The outer tube (1) and the inner tube (2) are characterized by further comprising: The assembly plate (3) and the first flange (4) and the second flange (5) on the outer walls on both sides thereof, the second flange (5) being located outside the first flange (4), and an assembly groove being formed between the first flange (4) and the second flange (5), wherein the assembly groove allows the inner tube (2) to be inserted; After docking, the outer wall of the first flange (4) is inserted into the interior of the two inner tubes (2) respectively; An annular groove (6) is provided inside the assembly disk (3), and the central axes of the annular groove (6), the inner tube (2) and the assembly disk (3) are in a collinear relationship. A plurality of inclined grooves are provided on the inner walls of the two assembly grooves, and the two ends of the inclined grooves are respectively communicated with the annular groove (6) and the assembly groove. Reaction rods (8) are slidably installed in the inclined grooves. When not docked, the two ends of the reaction rod (8) are respectively inserted into the assembly groove and the annular groove (6). When the inner tube (2) and the assembly groove are docked, the reaction rod (8) is forced to move and move into the annular groove (6). A detection structure for detecting the position state of each reaction rod (8) is installed inside the annular groove (6); When the positions of the plurality of reaction rods (8) are all in the correct positions, it is determined that the connection between the inner tube (2) and the assembly groove is correct.

2. The double-wall pipe connection device according to claim 1, characterized in that: The plurality of inclined grooves located in the same assembly groove are distributed in a circumferential array around the outer tube (1), and the plurality of inclined grooves in the two assembly grooves are symmetrical with the annular groove (6). The detection structure comprises a bearing seat mounted inside the annular groove (6), a linkage plate (11) being rotatably mounted on the bearing seat, and a gas pressure support rod (9) being hinged between the ends of the two nearest symmetrically distributed reaction rods (8), the rotation point of the linkage plate (11) being located on the mid-vertical line between the two reaction rods (8), and a reaction structure for measuring the horizontality of the linkage plate (11) being designed on the linkage plate (11). When the two inner tubes (2) are correctly docked with the assembly grooves, the two reaction rods (8) will restrict the linkage plate (11) to a horizontal state through the gas pressure support rod (9), and the horizontal line is parallel to the central axis of the inner tube (2). If the displacement of one of the reaction rods (8) deviates, the linkage plate (11) will tilt.

3. The double-wall pipe connection device according to claim 2, characterized in that: The reaction structure comprises a laser emitter (12) fixedly mounted on the outer wall of the linkage plate (11); the light emitted by the laser emitter (12) forms a perpendicular relationship with the surface of the linkage plate (11); the inner wall of the annular groove (6) is provided with a light transmission hole (7); the axis of the light transmission hole (7) is collinear with the radial line of the annular groove (6); a laser receiver (19) is installed inside the light transmission hole (7); when the light emitted by the laser emitter (12) passes through the light transmission hole (7) and is received by the laser receiver (19), it can be determined that the horizontal line of the linkage plate (11) is in a state parallel to the central axis of the annular groove (6).

4. The double-wall pipe connection device according to claim 3, characterized in that: A bearing plate (14) is installed between the outer wall of the inner tube (2) and the inner wall of the outer tube (1). When the inner tube (2) is correctly docked with the assembly groove, a sealed test space is formed between the bearing plate (14), the outer tube (1), the inner tube (2) and the assembly disk (3). A piston cavity (16) is provided on the outer wall of the assembly disk (3). The piston cavity (16) intersects with the light transmission hole (7). A piston partition (17) is slidably installed inside the piston cavity (16). A light leakage hole (18) is provided through the outer wall of the piston partition (17). An elastic member is installed between the piston partition (17) and the inner wall of the piston chamber (16), and the elastic member limits the piston partition (17) to an initial position. The light leakage hole (18) is located inside the piston partition (17) and is coaxially distributed. If the seal between the assembly groove and the inner tube (2) fails, the high-pressure gas inside the inner tube (2) will leak into the test space. The increase in the internal pressure of the test space will drive the piston partition (17) to move. At this time, the piston partition (17) blocks the light transmission hole (7) and blocks the light propagation of the laser emitter (12).

5. The double-wall pipe connection device according to claim 2, characterized in that: The reaction structure comprises an electronic level fixedly mounted on the surface of the linkage plate (11), and the electronic level can transmit angle values to an external digital display structure.

6. The double-wall pipe connection device according to claim 2, characterized in that: A valve stem (22) is rotatably mounted on the inner wall of the annular groove (6), and the valve stem (22) extends through the interior of the first flange (4). A valve plate (20) is fixedly mounted on the outer wall of the first flange (4). An actuator (21) is fixedly mounted on the inner wall of the annular groove (6), and the output end of the actuator (21) is transmission-connected to the valve stem (22). The rotation axis of the first flange (4) is collinear with the radial line of the assembly disk (3).

7. The double-wall pipe connection device according to claim 6, characterized in that: An annular groove is provided on the circumferential outer wall of the valve plate (20), an O-type sealing ring is installed in the groove, and the O-type sealing ring is made of fluororubber.

8. The double-wall pipe connecting device according to any one of claims 1 to 7, characterized in that: A plurality of sealing clamping rings (13) are embedded and installed on the inner wall of the assembly groove.

9. The double-wall pipe connection device according to claim 8, characterized in that: The outer wall of the outer tube (1) is also provided with a flange ring. The diameter of the assembly disk (3) is larger than the outer diameter of the flange ring. The flange ring can be fixed to the outer wall of the annular groove (6) by bolts.

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