A through-the-pipe dual conduit expansion seal device

Abstract

The application relates to a through-type double-pipe expansion sealing device which comprises a propelling motor, a rotating motor, a transmission assembly and an expansion mechanism, the telescopic shaft of the propelling motor is in contact connection with the bottom of the rotating motor, the expansion mechanism comprises an expansion rod, the rotating motor is fixedly connected with one end of the transmission assembly, and the expansion rod is engaged with the other end of the transmission assembly. Through the expansion mechanism, the torque of the rotating motor is converted into the pressure of the expansion mechanism for expanding and compressing the pipe through the transmission assembly, the inner and outer pipes are directly inserted, the connection is reliable, and the sealing performance is better under the action of sealing glue.

Description

Technical Field

[0001] This invention relates to the field of sealing technology for hazardous gas transport pipelines, specifically to a through-type double-pipe expansion sealing device. Background Technology

[0002] Hydrogen transport pipelines are systems specifically designed for the efficient and safe transport of hydrogen. These pipelines are typically made of high-pressure and corrosion-resistant materials, such as stainless steel or high-strength alloys, to withstand the high pressure of hydrogen and prevent hydrogen permeation; at the same time, hydrogen transport pipelines require tight seals and reliable connections to prevent the risk of hydrogen leakage or even explosion.

[0003] Currently available hydrogen transport pipelines typically use wire mesh tubing to transport hydrogen, a particularly suitable adaptive solution for applications requiring high pressure and high safety. Wire mesh tubing consists of an inner metal pipe layer and an outer wire mesh reinforcing layer, providing additional mechanical strength and pressure resistance. This structure effectively resists the high pressure of hydrogen and potential corrosion to the pipe material, while the wire mesh also enhances the pipeline's impact resistance and tensile strength. Because hydrogen molecules are very small and prone to leakage, the design of the wire mesh tubing ensures excellent sealing and safety, reducing the risk of leakage and enabling it to meet the transportation needs of hydrogen in high-pressure environments.

[0004] For the connection sealing of hydrogen transport pipelines, specially designed joints and specialized sealing technologies are required to ensure the safety and efficiency of the system. Because hydrogen molecules are extremely small and prone to leakage, high-strength sealing materials and precision-machined joints are typically used at pipeline connections to ensure leak-free operation. A common joint connection method involves applying sealant to the inner or outer surface of the joint fitting, then inserting both ends of the fitting into the pipeline. The inner surface of the pipeline contacts either the inner or outer surface of the joint fitting, creating two contact points that increase the risk of seal failure and leakage.

[0005] Prior art document 1 discloses a pipe opening device for sealing and maintaining stability. It comprises a steel ring module, an expansion mechanism, a support mechanism, a motor module, and a conveying mechanism. The expansion mechanism, support mechanism, and motor module are fixed to the conveying mechanism for installation and fixation. The steel ring module includes an adjustable ring. Through a lead screw in the expansion mechanism, the telescopic block is driven to expand outward or contract inward within the installation groove via mechanical transmission between the transmission mechanism and the rotating shaft. When the device is placed inside a flexible pipe, the motor rotates forward, driving the rotating shaft to rotate. The transmission mechanism rotates, which in turn drives the lead screw to expand the telescopic block outward. As the telescopic block expands outward within the mounting slot, it presses against the adjusting ring and moves it outward, increasing the diameter of the adjusting ring. This lifts the adjusting ring to the designated position on the flexible pipe, correcting and reinforcing the deformed pipe. After the flexible pipe is expanded, the motor reverses, causing the telescopic block to retract inward. Under the pressure of the outer tube of the flexible pipe, the adjusting ring retracts inward along with the telescopic block, reducing its diameter. The remaining mechanisms can then exit the flexible pipe, completing the expansion and repair of the flexible pipe.

[0006] However, the aforementioned prior art, which discloses a method based on expanding a flexible annular pipe and maintaining its stability during fluid transport, only achieves the expansion and stabilization of a single pipe by setting up an expansion device and a conveying mechanism, in order to facilitate maintenance. It cannot achieve the connection and reliable sealing between two pipes. Summary of the Invention

[0007] The purpose of this invention is to overcome the limitations of existing pipe expansion devices in achieving reliable connection and sealing between two pipes, and to provide a through-type double pipe expansion and sealing device.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] A through-type dual-pipe expansion sealing device is provided, including a propulsion motor, a rotary motor, and an expansion mechanism. The telescopic shaft of the propulsion motor is connected to the bottom of the rotary motor. The expansion mechanism includes a transmission assembly and an expansion rod. The rotary motor is fixedly connected to one end of the transmission assembly, and the expansion rod is engaged with the other end of the transmission assembly.

[0010] In the above-described process: First, sealant is applied to the top of the expansion rod, the outer surface of the inner tube to be connected, and the inner surface of the outer tube to be connected. Then, the propulsion motor is fixed inside the inner tube to be connected, so that the inner surface of the top of the expansion rod contacts the outer surface of the inner tube. Next, the rotary motor is started, which drives the transmission assembly to rotate. The transmission assembly, through a series of meshing transmissions, ultimately causes the expansion rod to move radially, compressing the inner diameter of the inner tube to be connected. When the compression reaches the point where the outer surface of the expansion rod can enter the inner tube, the compression stops. External force is then used to push the entire inner tube and expansion mechanism into the outer tube to be connected. At this point, the motor is rotated in the opposite direction, and the outer surface of the top of the expansion rod expands and squeezes the inner wall of the outer tube, increasing the inner diameter of the outer tube. The inner tube is then pushed by external force, gradually extending into the outer tube. Since both the inner and outer tubes are elastic, as the inner tube extends into the outer tube, its outer diameter increases due to its natural deformation, while the outer tube's inner diameter increases due to compression. As the expansion rod moves forward with the inner tube, the inner wall of the outer tube behind the expansion rod detaches from it and its inner diameter decreases, causing the inner and outer tubes to press tightly together under the action of the sealant. When the expansion rod has advanced the required distance, the inner tube is stopped from being pushed forward. At this point, the rotary motor is reversed and the telescopic motor is started. The expansion rod presses against the inner wall of the inner tube, creating a gap between the inner and outer tubes. The telescopic motor drives the rotary motor, thereby pushing the entire expansion mechanism, causing the expansion rod to detach from the interface between the inner and outer tubes, completing the docking of the inner and outer tubes. During the entire docking process, the expansion mechanism changes the outer diameter of the inner tube and the inner diameter of the outer tube by changing the torque of the rotating motor, so that the inner tube is inserted into the outer tube and fits tightly under the action of the sealant. There is no need to add a connecting fitting between the two tubes to achieve docking, resulting in fewer connection nodes and fewer sealing points. Furthermore, there is compressive stress between the inner and outer tubes, making the sealing effect more stable and reliable.

[0011] Furthermore, the transmission assembly includes a first gear, a second gear, and a third gear. The expansion rod includes an expansion portion and a rack portion. The output shaft of the rotary motor is fixedly connected to one end of the first gear. One end of the second gear meshes with the other end of the first gear. One end of the third gear meshes with the other end of the second gear, and the other end of the third gear meshes with the rack portion. The expansion portion is an arc-shaped pressure plate, which ensures a large contact area with the outer wall of the inner tube or the inner wall of the outer tube, thereby effectively compressing the inner tube or expanding the outer tube. The first gear is located on the side of the expansion mechanism away from the rotary motor. During installation and trial operation, the operator can manually rotate the first gear to check the reliability of the rotation.

[0012] Furthermore, it also includes a first mounting bracket and a second mounting bracket, both of which are annular. The third gear is mounted on the circular edge of the second mounting bracket and rotatably connected. The expansion rod is mounted on the first mounting bracket, and the first mounting bracket is fitted over the second mounting bracket. By setting the first mounting bracket to fit over the second mounting bracket, the rack will not loosen circumferentially when it moves radially, ensuring that the rack portion of the expansion rod meshes stably with the third gear and transmits power.

[0013] Furthermore, the first mounting bracket has several through holes on its annular edge, and the second mounting bracket has a central spoke portion fixedly connected inside its annular edge. The rack portion consists of two opposing racks, one toothed and the other toothless. The third gear is located at the top of the spoke of the central spoke portion, and the spoke of the central spoke portion is located between the two racks of the rack portion. Several through holes are evenly distributed on the annular edge, and each through hole corresponds to an expansion rod, which can evenly apply pressure to the outer or inner tube. The two racks of the rack portion mesh with the third gear on both sides of the third gear, resulting in smoother meshing transmission.

[0014] Furthermore, the center of the first gear component is fixedly connected to the rotary motor, the outer surface of the second gear component is provided with a first meshing tooth, the inner surface is provided with a second meshing tooth, the third gear component is provided with a third meshing tooth and a fourth meshing tooth, the first meshing tooth meshes with the first gear component, the second meshing tooth meshes with the third meshing tooth, and the fourth meshing tooth meshes with the rack portion; the first gear component is shaped as an annular inner gear ring with several spoke skeletons fixed on the outer side, the second gear component is shaped as an annular gear ring with meshing teeth on both the inner and outer sides, and the third gear component is shaped as a gear component consisting of two gears of the same size fixed together axially, with a clearance space provided between the two gears.

[0015] Furthermore, the expansion mechanism also includes a limiting member, which is installed on the rack portion and meshes with the rack portion. The limiting member consists of a rack block and a fixing block. After the rack block meshes with the rack portion, the fixing block is fitted onto the rack portion and its two sides are fixedly connected to the rack block. The limiting block can be installed at different positions on the rack portion to limit the radial displacement stroke of the expansion rod as needed.

[0016] Furthermore, it also includes a supporting shell, through which the propulsion motor and the rotary motor are connected. The surface of the supporting shell is also provided with an anchoring part and a first elastic element. The anchoring part is used to install an external tow rope, and the first elastic element is used to contact the inner wall of the pipe and support the supporting shell. The first elastic element can elastically change according to the different inner diameters of the inner pipe to ensure stable contact with the inner wall of the inner pipe and provide support for the rotary motor. The shape of the anchoring part can stably hold the tow rope, making disassembly more convenient.

[0017] Furthermore, it also includes an extrusion mechanism, which is installed between the rotary motor and the expansion mechanism. The extrusion mechanism includes a housing, a cylinder, and an extrusion plate. The cylinder is installed inside the housing, and the extrusion plate is fixedly connected to the piston of the cylinder. The extrusion mechanism is mounted on the output shaft of the rotary motor between the rotary motor and the expansion mechanism and is rotatably connected. The top end of the piston rod of the cylinder is fixedly connected to the extrusion plate. During installation, the outer surface of the extrusion plate contacts the inner wall of the inner tube end, while the inner surface of the expansion part contacts the outer wall of the inner tube end. During operation, when the expansion part expands outward to the outer wall of the outer tube, the extrusion plate extrudes outward to the inner wall of the inner tube, squeezing the sealant in the expansion part to the surrounding area, so that the sealant can fully exert its sealing effect.

[0018] Furthermore, it also includes a support mechanism and a connecting rod, wherein the support mechanism is fixedly connected to the center of the first gear component via the connecting rod; the support mechanism provides rigid support for the entire expansion mechanism on the side of the first transmission component away from the rotary motor.

[0019] Furthermore, the support mechanism includes several support members, a support center block, a second elastic member, and a third elastic member. One end of each support member is rotatably connected to the support center block. The support members are arranged side by side along the axial direction of the support center block. The second elastic member is installed between two of the support members, and the third elastic member is installed at the end of the support member away from the support center block. The second elastic member is a spring, installed between two parallel support members, so that the rotation of the two support members is coordinated with each other. When entering the outer tube, the two support members can rotate and change to adapt to different inner diameters of the outer tube. Under the action of the spring, there is a certain pressure between the support member and the inner wall of the outer tube to ensure stable contact between the two. The third elastic member is a rubber body, which has good wear resistance and can prevent the support member from scratching the inner wall of the outer tube.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. By setting up a propulsion motor, a rotary motor, a transmission assembly, and an expansion mechanism, the telescopic shaft of the propulsion motor is connected to the bottom of the rotary motor. The expansion mechanism includes an expansion rod. One end of the rotary motor is fixedly connected to the transmission assembly, and the other end of the expansion rod is engaged with the transmission assembly. The torque of the rotary motor drives the expansion rod to expand the outer tube and compress the inner tube, inserting the inner tube into the outer tube. Under the action of the sealant, the two are tightly fitted together. There is no need to add a connecting fitting between the two tubes to achieve docking. There are fewer connection nodes and fewer sealing points. Moreover, there is compressive stress between the inner and outer tubes, resulting in a more stable and reliable sealing effect.

[0022] 2. A pressing mechanism is set between the rotary motor and the expansion mechanism. During installation, the outer surface of the pressing plate contacts the inner wall of the inner tube end, while the inner surface of the expansion part contacts the outer wall of the inner tube end. During operation, when the expansion part expands the outer wall of the outer tube outward, the pressing plate presses the inner wall of the inner tube outward, squeezing the sealant in the expansion part to the surrounding area. This ensures that the sealant can stably bond and seal the inner and outer tubes. After the expansion part separates from the interface between the inner and outer tubes, due to the elastic compression of the inner and outer tubes, the sealant can also flow from more areas to fewer areas, forming a stable seal. Attached Figure Description

[0023] Figure 1 A perspective view of a through-type dual-pipe expansion sealing device;

[0024] Figure 2 An exploded view of the rotary motor, transmission assembly, and expansion mechanism of a through-type dual-pipe expansion sealing device;

[0025] Figure 3 An exploded view of the transmission assembly and expansion mechanism of a through-type dual-pipe expansion sealing device;

[0026] Figure 4 A schematic diagram of the combination of an expansion rod and a limiting component in a through-type dual-pipe expansion sealing device;

[0027] Figure 5 This is a schematic diagram of the combination of the support mechanism and connecting rod of a through-type double-pipe expansion sealing device.

[0028] In the attached diagram: 100, propulsion motor; 200, rotary motor; 300, transmission assembly; 310, first gear; 320, second gear; 321, first meshing tooth; 322, second meshing tooth; 330, third gear; 331, third meshing tooth; 332, fourth meshing tooth; 400, expansion mechanism; 410, expansion rod; 411, expansion section; 412, rack section; 420, limiting member; 500, first mounting bracket; 600, second mounting bracket; 610, center spoke section; 700, support shell; 710, anchoring section; 720, first elastic element; 800, extrusion mechanism; 810, shell; 820, cylinder; 830, extrusion plate; 900, support mechanism; 910, support member; 920, support center block; 930, second elastic element; 940, third elastic element; 1000, connecting rod. Detailed Implementation

[0029] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0030] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0031] Example 1

[0032] This embodiment is a first embodiment of a through-type dual-pipe expansion sealing device, such as... Figures 1 to 4 As shown, it includes a propulsion motor 100, a rotary motor 200, and an expansion mechanism 400. The telescopic shaft of the propulsion motor 100 is connected to the bottom of the rotary motor 200. The expansion mechanism 400 includes a transmission assembly 300 and an expansion rod 410. The rotary motor 200 is fixedly connected to one end of the transmission assembly 300, and the expansion rod 410 is engaged with the other end of the transmission assembly 300.

[0033] Specifically, the transmission assembly 300 includes a first gear 310, a second gear 320, and a third gear 330. The expansion rod 410 includes an expansion portion 411 and a rack portion 412. The output shaft of the rotary motor 200 is fixedly connected to one end of the first gear 310. One end of the second gear 320 meshes with the other end of the first gear 310. One end of the third gear 330 meshes with the other end of the second gear 320, and the other end of the third gear 330 meshes with the rack portion 412. The expansion portion 411 is an arc-shaped pressure plate, which can ensure a large contact area with the outer wall of the inner tube or the inner wall of the outer tube, thereby effectively compressing the inner tube or expanding the outer tube. The first gear 310 is located on the side of the expansion mechanism 400 away from the rotary motor 200. During installation and trial operation, the operator can manually rotate the first gear 310 to check the reliability of the rotation.

[0034] In addition, the transmission assembly 300 may also be in the form of only including a first gear 310 and a third gear 330, with the first gear 310 directly meshing with the third gear 330 for transmission.

[0035] Specifically, it also includes a first mounting bracket 500 and a second mounting bracket 600, both of which are annular. The third gear 330 is mounted on the circular edge of the second mounting bracket 600 and rotatably connected. The expansion rod 410 is mounted on the first mounting bracket 500, and the first mounting bracket 500 is fitted onto the second mounting bracket 600. By setting the first mounting bracket 500 to be fitted onto the second mounting bracket 600, the rack will not loosen circumferentially when it moves radially, ensuring that the rack portion 412 of the expansion rod 410 and the third gear 330 mesh stably and transmit power.

[0036] Specifically, the annular edge of the first mounting bracket 500 is provided with several through holes, and the annular edge of the second mounting bracket 600 is also fixedly connected to a central spoke portion 610. The rack portion 412 is composed of two opposing racks, one of which has teeth and the other does not. The third gear component 330 is located at the top of the spoke of the central spoke portion 610, and the spoke of the central spoke portion 610 is located between the two racks of the rack portion 421. Several through holes are evenly arranged on the annular edge, and each through hole corresponds to an expansion rod 410, which can evenly apply pressure to the outer tube or the inner tube. The two racks of the rack portion 412 mesh with the third gear component 330 on both sides of the third gear component 330, making the meshing transmission smoother.

[0037] Specifically, the center of the first gear component 310 is fixedly connected to the rotary motor 200. The outer surface of the second gear component 320 is provided with a first meshing tooth 321, and the inner surface is provided with a second meshing tooth 322. The third gear component 330 is provided with a third meshing tooth 331 and a fourth meshing tooth 332. The first meshing tooth 321 meshes with the first gear component 310, the second meshing tooth 322 meshes with the third meshing tooth 331, and the fourth meshing tooth 332 meshes with the rack portion 412. The first gear component 310 is a ring-shaped inner gear ring with several spoke skeletons fixed on the outside. The second gear component 320 is a ring-shaped gear ring with meshing teeth on both the inner and outer sides. The third gear component 330 is a gear component consisting of two gears of the same size fixed together in the axial direction, with a clearance space between the two gears.

[0038] Specifically, such as Figure 4 As shown, the expansion mechanism 400 also includes a limiting member 420, which is mounted on the rack portion 412 and meshes with the rack portion 412. The limiting member 420 is divided into a rack block and a fixing block. After the rack block meshes with the rack portion 412, the fixing block is fitted onto the rack portion 412 and its two sides are fixedly connected to the rack block. The limiting block can be installed at different positions on the rack portion 412 to limit the radial displacement stroke of the expansion rod 410 as needed.

[0039] Specifically, it also includes a support housing 700. The propulsion motor 100 and the rotary motor 200 are connected through the support housing 700. The surface of the support housing 700 is also provided with an anchoring part 710 and a first elastic element 720. The anchoring part 710 is used to install an external tow rope, and the first elastic element 720 is used to contact the inner wall of the pipe and support the support housing 700. The first elastic element 720 can elastically change according to the different inner diameters of the inner pipe to ensure stable contact with the inner wall of the inner pipe and provide support for the rotary motor 200. The shape of the anchoring part 710 can stably hold the tow rope, making disassembly more convenient.

[0040] The working principle of a through-type double-pipe expansion sealing device in this embodiment is as follows:

[0041] First, sealant is applied to the top of the expansion rod 410, the outer surface of the inner tube to be docked, and the inner surface of the outer tube to be docked. Then, the limiting member 420 is installed on the rack of the rack part 412 and fixed in place as needed. Next, the push motor 100 is fixed inside the inner tube to be docked, so that the first elastic member 720 of the supporting shell 700 contacts the inner wall of the inner tube, and the inner surface of the expansion rod 410 contacts the outer surface of the docking inner tube. Then, the rotary motor 200 is started, sequentially driving the first gear 310, the second gear 320, and the third gear 330, finally driving the rack part 412 to cause the expansion part 411 to shift radially, compressing the inner diameter of the inner tube to be docked. Compression stops when the outer surface of the expansion rod 410 can enter the interior of the outer tube to be docked. External force is then used to push the entire inner tube and the expansion mechanism 400 into the outer tube to be docked. At this point, the motor is rotated in the reverse direction, and the expansion rod 410... The top outer surface expands and compresses the inner wall of the outer tube, increasing its inner diameter. Then, external force is applied to push the entire inner tube, causing it to gradually extend into the outer tube. Since both the inner and outer tubes are elastic, as the inner tube extends into the outer tube, its outer diameter increases due to the inner tube's recovery deformation, while the outer tube's inner diameter increases due to compression. As the expansion rod 410 advances with the inner tube, the inner wall of the outer tube behind the expansion rod 410 detaches from it and recovers its inner diameter, causing the inner and outer tubes to press against each other and fit tightly together under the action of sealant. When the expansion rod 410 has advanced to the required distance, the advancement of the inner tube is stopped. At this point, the rotary motor 200 is reversed and the telescopic motor is started. The expansion rod 410 compresses the inner wall of the inner tube, creating a gap between the inner and outer tubes. The telescopic motor pushes the rotary motor 200, thereby pushing the entire expansion mechanism 400, causing the expansion rod 410 to detach from the interface between the inner and outer tubes. Finally, a towing rope is fixed to the anchoring part 710, and the entire device is pulled out of the tube.

[0042] The beneficial effects of this embodiment are as follows: the expansion mechanism 400 changes the outer diameter of the inner tube and the inner diameter of the outer tube by the torque of the rotary motor 200, so that the inner tube is inserted into the outer tube and tightly fitted under the action of the sealant. There is no need to add a connecting pipe between the two tubes to achieve docking, there are fewer connection nodes and fewer sealing points, and there is compressive stress between the inner and outer tubes, so the sealing effect is more stable and reliable.

[0043] Example 2

[0044] This embodiment is a second embodiment of a through-type dual-pipe expansion sealing device, such as... Figure 2 and 3 As shown, the difference from Embodiment 1 is as follows:

[0045] Specifically, it also includes an extrusion mechanism 800, which is installed between the rotary motor 200 and the expansion mechanism 400. The extrusion mechanism 800 includes a housing 810, a cylinder 820, and an extrusion plate 830. The cylinder 820 is installed inside the housing 810, and the extrusion plate 830 is fixedly connected to the piston of the cylinder 820. The extrusion mechanism 800 is mounted on the output shaft of the rotary motor 200 between the rotary motor 200 and the expansion mechanism 400 and is rotatably connected. The top of the piston rod of the cylinder 820 is fixedly connected to the extrusion plate 830. During installation, the outer surface of the extrusion plate 830 contacts the inner wall of the inner tube end, while the inner surface of the expansion part 411 contacts the outer wall of the inner tube end. During operation, when the expansion part 411 expands outward to the outer wall of the outer tube, the extrusion plate 830 extrudes outward to the inner wall of the inner tube, squeezing the sealant in the expansion part 411 to the surrounding area, so that the sealant can fully exert its sealing effect.

[0046] The working principle of the through-type double-pipe expansion sealing device in this embodiment is as follows: During the process of the inner tube being continuously inserted and the expansion rod 410 expanding the outer tube, the cylinder 820 is connected to an external pressurizing device. Through pressurization and depressurization, the inner wall of the inner tube is continuously squeezed, and the sealant in the expansion part 411 is squeezed to the surrounding area, so that the sealant can stably bond and seal the inner and outer tubes.

[0047] The beneficial effects of this embodiment are as follows: When the expansion part 411 expands the outer wall of the outer tube outward, the extrusion piece 830 extrudes the inner wall of the inner tube outward, squeezing the sealant in the expansion part 411 to the surrounding area, ensuring that the sealant can stably bond and seal the inner and outer tubes. After the expansion part 411 separates from the interface between the inner and outer tubes, due to the elastic extrusion of the inner and outer tubes, the sealant can also flow from more places to fewer places, forming a stable seal.

[0048] Example 3

[0049] This embodiment is a second embodiment of a through-type dual-pipe expansion sealing device, such as... Figure 1 and 5 As shown, the difference from Embodiment 1 is as follows:

[0050] Specifically, it also includes a support mechanism 900 and a connecting rod 1000. The support mechanism 900 is fixedly connected to the center of the first gear component 310 via the connecting rod 1000. The support mechanism 900 provides rigid support for the entire expansion mechanism 400 on the side of the first transmission component away from the rotary motor 200.

[0051] Specifically, the support mechanism 900 includes several support members 910, a support center block 920, a second elastic member 930, and a third elastic member 940. One end of each support member 910 is rotatably connected to the support center block 920. The support members 910 are arranged side by side along the axial direction of the support center block 920. The second elastic member 930 is installed between the two support members 910, and the third elastic member 940 is installed at the end of the support member 910 away from the support center block 920. The second elastic member 930 is a spring, installed between the two side by side support members 910, so that the rotation of the two support members 910 is coordinated with each other. When entering the outer tube, the two support members 910 can rotate and change to adapt to different inner diameters of the outer tube. Under the action of the spring, there is a certain pressure between the support member 910 and the inner wall of the outer tube to ensure stable contact between the two. The third elastic member 940 is a rubber body, which has good wear resistance and can prevent the support member 910 from scratching the inner wall of the outer tube.

[0052] The working principle of a through-type double-pipe expansion sealing device in this embodiment is as follows:

[0053] When the support mechanism 900 is inserted into the outer tube, the second elastic element 930 is elastically stretched, causing the support element 910 to rotate relative to the support center block 920. The vertical distance between the end of the support element 910 and the support center block 920 is reduced, so that the radius of the end of the support element 910 adapts to the outer tube, and the support mechanism 900 is smoothly inserted into the outer tube. The third elastic element 940 contacts the inner wall of the outer tube. During the expansion process of the expansion mechanism 400, the contact between the support element 910 and the inner wall of the outer tube provides support for the expansion mechanism 400.

[0054] The beneficial effects of this embodiment are: the support member 910 can provide support for the entire device in the outer tube, making the expansion more stable, while the third elastic member 940 is a rubber body, which has good wear resistance and can prevent the support member 910 from scratching the inner wall of the outer tube.

[0055] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0056] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A through-type double-pipe expansion sealing device, characterized in that, The device includes a propulsion motor (100), a rotary motor (200), and an expansion mechanism (400). The telescopic shaft of the propulsion motor (100) is connected to the bottom of the rotary motor (200). The expansion mechanism (400) includes a transmission assembly (300) and an expansion rod (410). The rotary motor (200) is fixedly connected to one end of the transmission assembly (300), and the expansion rod (410) engages with the other end of the transmission assembly (300). The transmission assembly (300) includes a first gear (310), a second gear (320), and a third gear (330). The expansion rod (410) includes an expansion portion (411) and a rack portion (412). The output shaft of the rotary motor (200) is fixedly connected to one end of the first gear (310). One end of the second gear (320) meshes with the other end of the first gear (310). One end of the third gear (330) meshes with the other end of the second gear (320). The other end of the third gear (330) meshes with the rack portion (412). It also includes a first mounting bracket (500) and a second mounting bracket (600), both of which are annular. The third gear component (330) is mounted on the circular edge of the second mounting bracket (600) and rotatably connected. The expansion rod (410) is mounted on the first mounting bracket (500), and the first mounting bracket (500) is fitted onto the second mounting bracket (600). The first mounting bracket (500) has several through holes on its annular edge. The second mounting bracket (600) also has a central spoke portion (610) fixedly connected inside its annular edge. The rack portion (412) is composed of two opposing racks, one of which has teeth and the other does not. The third gear component (330) is located at the top of the spokes of the central spoke portion (610). The spokes of the central spoke portion (610) are located between the two racks of the rack portion (412). The center of the first gear component (310) is fixedly connected to the rotary motor (200). The outer surface of the second gear component (320) is provided with a first meshing tooth (321), and the inner surface is provided with a second meshing tooth (322). The third gear component (330) is provided with a third meshing tooth (331) and a fourth meshing tooth (332). The first meshing tooth (321) meshes with the first gear component (310), the second meshing tooth (322) meshes with the third meshing tooth (331), and the fourth meshing tooth (332) meshes with the rack portion (412). The expansion mechanism (400) further includes a limiting member (420), which is mounted on the rack portion (412) and engages with the rack portion (412); The expansion mechanism (400) changes the outer diameter of the inner tube and the inner diameter of the outer tube by the torque of the rotary motor (200), so that the inner tube is inserted into the outer tube and fits tightly under the action of the sealant.

2. The through-type double-pipe expansion sealing device according to claim 1, characterized in that, It also includes an extrusion mechanism (800), which is installed between the rotary motor (200) and the expansion mechanism (400). The extrusion mechanism (800) includes a housing (810), a cylinder (820) and an extrusion plate (830). The cylinder (820) is installed inside the housing (810), and the extrusion plate (830) is fixedly connected to the piston of the cylinder (820).

3. The through-type double-pipe expansion sealing device according to claim 1, characterized in that, It also includes a support mechanism (900) and a connecting rod (1000), wherein the support mechanism (900) is fixedly connected to the center of the first gear component (310) via the connecting rod (1000).

4. The through-type double-pipe expansion sealing device according to claim 3, characterized in that, The support mechanism (900) includes several support members (910), a support center block (920), a second elastic member (930), and a third elastic member (940). One end of each support member (910) is rotatably connected to the support center block (920). The support members (910) are arranged side by side along the axial direction of the support center block (920). The second elastic member (930) is installed between two of the support members (910). The third elastic member (940) is installed at the end of the support member (910) away from the support center block (920).

Images