Penetrating type double-pipeline expansion sealing equipment

Abstract

The invention relates to penetrating type double-pipeline expansion sealing equipment which comprises a propelling motor, a rotating motor, a transmission assembly and an expansion mechanism, a 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 meshed with the other end of the transmission assembly. By arranging the expansion mechanism, the torque of the rotating motor is converted into the pressure of the expansion mechanism for expanding and compressing the pipeline through the transmission assembly, direct insertion connection of the inner pipe and the outer pipe is achieved, and under the action of sealant, connection is reliable, and sealing performance is better.

Description

Technical Field

[0001] The invention relates to the technical field of sealing of hazardous gas transport pipelines, and in particular to a through-type double-pipeline expansion sealing device. Background Art

[0002] Hydrogen transport pipelines are systems specially designed to transport hydrogen efficiently and safely. These pipelines are usually 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 penetration; at the same time, hydrogen transport pipelines require tight sealing and reliable connections to prevent the risk of hydrogen leakage or even explosion.

[0003] Currently, existing hydrogen transportation pipelines usually use steel mesh pipes to transport hydrogen, which is an adaptable solution that is particularly suitable for high pressure and high safety requirements. The steel mesh pipe consists of an inner metal pipe and an outer steel mesh reinforcement layer, which provides additional mechanical strength and pressure resistance. This structure can effectively resist the high pressure of hydrogen and potential corrosion of pipeline materials. At the same time, the presence of steel mesh also enhances the impact resistance and tensile strength of the pipeline. Since hydrogen molecules are very small and easy to leak, the design of the steel mesh pipe ensures good sealing and safety, reduces the risk of leakage, and can adapt to the transportation needs of hydrogen under high pressure.

[0004] As for the connection and sealing of hydrogen transport pipelines, it is necessary to use specially designed joints and special sealing technology to ensure the safety and efficiency of the system. Since hydrogen molecules are extremely small and easy to leak, high-strength sealing materials and precision-machined joints are usually used at the pipeline connection to ensure no leakage. The commonly used joint connection form is to apply sealant on the inner or outer surface of the joint pipe and then insert the pipeline at both ends of the joint pipe. The inner surface of the pipeline contacts the inner surface or outer surface of the joint pipe. The pipeline at both ends forms two contact points with the joint pipe, which increases the risk of sealing failure and leakage.

[0005] Comparative document 1 discloses a pipeline expansion device for sealing and maintaining stability of pipelines, which is provided with a steel ring module, an expansion mechanism, a support mechanism, a motor module and a conveying mechanism. The expansion mechanism, the support mechanism and the motor module are respectively fixed on the conveying mechanism to realize the installation and fixation of the device. The steel ring module includes an adjustable ring with adjustable diameter. The lead screw in the expansion mechanism drives the telescopic block to expand outward or contract inward in the installation groove under the mechanical transmission of the transmission mechanism and the rotating shaft. The device is placed in the soft pipeline, and the motor rotates forward to drive the rotating shaft to rotate. The rotating shaft The transmission mechanism is driven to rotate, and the transmission mechanism drives the lead screw to drive the telescopic block to expand outward. When the telescopic block expands outward in the installation groove, the telescopic block supports the adjusting ring and drives the adjusting ring to move outward, and the diameter of the adjusting ring becomes larger, so that the adjusting ring is lifted to the specified position on the soft pipe, and the deformed soft pipe is corrected and reinforced. After the soft pipe is opened, the motor is controlled to reverse, and the telescopic block shrinks inward. The adjusting ring shrinks inward with the telescopic block under the pressure of the soft outer tube, and the diameter of the adjusting ring becomes smaller. The remaining mechanisms can withdraw from the soft pipe, and the opening and maintenance of the soft pipe are completed.

[0006] However, the above-mentioned prior art discloses that the soft annular pipe is expanded and kept stable during the fluid transportation process. By setting up an expansion device and a conveying mechanism, only a single pipe is expanded and stabilized to facilitate maintenance, and the connection and reliable sealing between the two pipes cannot be achieved. Summary of the invention

[0007] The purpose of the present invention is to overcome the limitation that the existing pipeline expansion device cannot realize the connection and reliable sealing between double pipelines, and to provide a through-type double pipeline expansion and sealing device.

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

[0009] A through-type double-pipe expansion and sealing device is provided, comprising a propulsion motor, a rotating motor and an expansion mechanism, wherein the telescopic shaft of the propulsion motor is in contact with and connected to the bottom of the rotating motor, the expansion mechanism comprises a transmission assembly and an expansion rod, the rotating motor is fixedly connected to one end of the transmission assembly, and the expansion rod is meshed with the other end of the transmission assembly.

[0010] During the working process of the above scheme: 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, and 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 to be connected, and then the rotating motor is started, and the rotating motor drives the transmission component to rotate, and the transmission component drives the expansion rod to move in the radial direction through a series of meshing transmissions, compressing the inner diameter of the inner tube to be connected, and when the compression is stopped until the outer surface of the expansion rod can enter the interior of the outer tube to be connected, the compression is stopped, and an external force is used to push the entire inner tube and the expansion mechanism into the outer tube to be connected. At this time, 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, so that the inner diameter of the outer tube increases The expansion rod moves forward along with the inner tube, and then uses external force to push the entire inner tube so that the inner tube gradually extends into the outer tube. Since both the inner tube and the outer tube are elastic, during the process of the inner tube extending into the outer tube, the inner tube recovers its deformation and its outer diameter increases, and the outer tube is squeezed and deformed and its inner diameter increases. When the expansion rod moves forward along with the inner tube, the inner wall of the outer tube behind the expansion rod breaks away from the expansion rod and then recovers its deformation and its inner diameter decreases, so that the inner tube and the outer tube are squeezed against each other and fit tightly under the action of the sealant. When the expansion rod moves forward to the required distance, the inner tube is stopped from being pushed forward. At this time, the rotating motor is reversed and the telescopic motor is started. The expansion rod squeezes the inner wall of the inner tube so that there is a gap between the inner and outer tubes. The telescopic motor pushes the rotating motor, thereby pushing the entire expansion mechanism, so that the expansion rod is separated from the interface between the inner and outer tubes, and the docking of the inner and outer tubes is completed. During the entire docking process, an expansion mechanism is used to change the outer diameter of the inner tube and the inner diameter of the outer tube through 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 pipe between the two tubes to achieve docking, there are fewer connection nodes, fewer sealing points, and there is extrusion stress between the inner and outer tubes, so the sealing effect is more stable and reliable.

[0011] Furthermore, the transmission assembly includes a first gear member, a second gear member and a third gear member, the expansion rod includes an expansion portion and a rack portion, the output shaft of the rotating motor is fixedly connected to one end of the first gear member, one end of the second gear member is meshed with the other end of the first gear member, one end of the third gear member is meshed with the other end of the second gear member, and the other end of the third gear member is meshed with the rack portion; the expansion portion is in the form of an arc-shaped pressure plate, which can ensure a larger 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, and the first gear member is located on the side of the expansion mechanism away from the rotating motor. During installation and trial operation, the operator can manually rotate the first gear member to check the reliability of rotation.

[0012] Furthermore, it also includes a first mounting frame and a second mounting frame, the first mounting frame and the second mounting frame are both annular, the third gear member is installed at the circular edge of the second mounting frame and is rotatably connected, the expansion rod is installed on the first mounting frame, and the first mounting frame is sleeved outside the second mounting frame; by arranging the first mounting frame to be sleeved on the second mounting frame, the rack will not loosen circumferentially when moving in the radial direction, ensuring that the rack portion of the expansion rod and the third gear member are stably engaged and transmit power.

[0013] Furthermore, the annular edge of the first mounting frame is provided with a plurality of through holes, and the inside of the annular edge of the second mounting frame is also fixedly connected with a center spoke portion, the rack portion is composed of two oppositely arranged racks, and the third gear member is located at the top of the spokes of the center spoke portion, and the spokes of the center spoke portion pass through the rack portion; a plurality of through holes are evenly arranged on the annular edge, and each through hole corresponds to an expansion rod, which can evenly apply pressure to the outer tube or the inner tube, and the two racks of the rack portion are meshed with the third gear member on both sides of the third gear member, and the meshing transmission is smoother.

[0014] Furthermore, the center of the first gear member is fixedly connected to the rotating motor, the outer surface of the second gear member is provided with a first meshing tooth, the inner surface is provided with a second meshing tooth, the third gear member is provided with a third meshing tooth and a fourth meshing tooth, the first meshing tooth is meshed with the first gear member, the second meshing tooth is meshed with the third meshing tooth, and the fourth meshing tooth is meshed with the rack portion; the first gear member is in the form of an annular inner gear ring with a plurality of spoke skeletons fixed on the outside, the second gear member is in the form of an annular gear ring with meshing teeth both inside and outside, and the third gear member is in the form of two gears of the same size fixed as one in the axial direction, and a space is provided between the two gears.

[0015] Furthermore, the expansion mechanism also includes a limit member, which is installed on the rack portion and meshed with the rack portion; the limit member is divided into a rack block and a fixed block. After the rack block meshes with the rack portion, the fixed block is mounted on the rack portion, and the two side surfaces are fixedly connected to the rack block. The limit block can be installed at different positions of the rack portion to limit the radial displacement stroke of the expansion rod as needed.

[0016] Furthermore, it also includes a supporting shell, and the propulsion motor is connected to the rotating motor through the supporting shell. The surface of the supporting shell is also provided with an anchoring part and a first elastic part. The anchoring part is used to install an external towing rope, and the first elastic part is used to contact the inner wall of the pipeline and support the supporting shell; the first elastic part can change elastically according to the different inner diameters of the inner tube, ensuring stable contact with the inner wall of the inner tube and providing support for the rotating motor. The shape of the anchoring part can stably hook the towing rope, making disassembly more convenient.

[0017] Furthermore, it also includes an extrusion mechanism, which is installed between the rotating motor and the expansion mechanism. The extrusion mechanism includes a shell, a cylinder and an extrusion plate. The cylinder is installed in the shell, and the extrusion plate is fixedly connected to the piston of the cylinder; the extrusion mechanism is sleeved on the output shaft of the rotating motor between the rotating motor and the expansion mechanism and is rotatably connected, and 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 end of the inner tube, and the inner surface of the expansion part contacts the outer wall of the end of the inner tube. During operation, when the expansion part expands the outer wall of the outer tube outward, the extrusion plate squeezes the inner wall of the inner tube outward, squeezing the sealant in the expansion part toward the surrounding area, so that the sealant can fully exert its sealing effect.

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

[0019] Furthermore, the support mechanism includes a plurality of support members, a support center block, a second elastic member and a third elastic member. One end of the support member is rotatably connected to the support center block. The support members are arranged in parallel in the axial direction of the support center block. The second elastic member is installed between the two 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, which is installed between the 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 present invention has the following beneficial effects:

[0021] 1. By arranging a propulsion motor, a rotating motor, a transmission assembly and an expansion mechanism, the telescopic shaft of the propulsion motor is in contact with and connected to the bottom of the rotating motor, the expansion mechanism includes an expansion rod, the rotating motor is fixedly connected to one end of the transmission assembly, and the expansion rod is meshed with the other end of the transmission assembly. The torque of the rotating motor is used to drive the expansion rod to expand the outer tube and compress the inner tube, and the inner tube is inserted into the outer tube. Under the action of the sealant, the two are tightly fitted, and there is no need to add a connecting pipe fitting between the two tubes to achieve docking. There are fewer connection nodes and fewer sealing points, and there is extrusion stress between the inner and outer tubes, so the sealing effect is more stable and reliable.

[0022] 2. An extrusion mechanism is arranged between the rotating motor and the expansion mechanism. During installation, the outer surface of the extrusion sheet contacts the inner wall of the inner tube end, and the inner surface of the expansion portion contacts the outer wall of the inner tube end. During operation, when the expansion portion expands the outer wall of the outer tube outward, the extrusion sheet squeezes the inner wall of the inner tube outward, and squeezes the sealant in the expansion portion toward the surroundings, ensuring that the sealant can stably bond and seal the inner and outer tubes. After the expansion portion detaches from the interface of 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 less places, forming a stable sealing fit. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A three-dimensional diagram of a through-type double-pipe expansion sealing device;

[0024] Figure 2 It is a structural exploded diagram of a rotating motor, a transmission assembly and an expansion mechanism of a through-type double-pipe expansion sealing device;

[0025] Figure 3 It is a structural exploded diagram of a transmission assembly and an expansion mechanism of a through-type double-pipe expansion and sealing device;

[0026] Figure 4 A schematic diagram of the combination of an expansion rod and a stopper of a through-type double-pipe expansion sealing device;

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

[0028] In the accompanying drawings: 100, propulsion motor; 200, rotating motor; 300, transmission assembly; 310, first gear member; 320, second gear member; 321, first meshing tooth; 322, second meshing tooth; 330, third gear member; 331, third meshing tooth; 332, fourth meshing tooth; 400, expansion mechanism; 410, expansion rod; 411, expansion part; 412, rack part; 420, limit member; 500, first mounting frame; 600, second mounting frame; 610, central spoke part; 700, supporting shell; 710, anchoring part; 720, first elastic member; 800, extrusion mechanism; 810, shell; 820, cylinder; 830, extrusion sheet; 900, support mechanism; 910, support member; 920, support center block; 930, second elastic member; 940, third elastic member; 1000, connecting rod. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with specific implementation methods. The accompanying drawings are only used for exemplary descriptions and are only schematic diagrams, not actual drawings, and cannot be understood as limiting this patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted.

[0030] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0031] Example 1

[0032] This embodiment is a first embodiment of a through-type double-pipe expansion sealing device. Figures 1 to 4 As shown, it includes a propulsion motor 100, a rotating motor 200 and an expansion mechanism 400. The telescopic shaft of the propulsion motor 100 is in contact and connected with the bottom of the rotating motor 200. The expansion mechanism 400 includes a transmission assembly 300 and an expansion rod 410. The rotating 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 member 310, a second gear member 320 and a third gear member 330, the expansion rod 410 includes an expansion portion 411 and a rack portion 412, the output shaft of the rotating motor 200 is fixedly connected to one end of the first gear member 310, one end of the second gear member 320 is meshed with the other end of the first gear member 310, one end of the third gear member 330 is meshed with the other end of the second gear member 320, and the other end of the third gear member 330 is meshed with the rack portion 412; the expansion portion 411 is in the form of 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 member 310 is located on the side of the expansion mechanism 400 away from the rotating motor 200, and during installation and trial operation, the operator can manually rotate the first gear member 310 to check the reliability of rotation.

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

[0035] Specifically, it also includes a first mounting frame 500 and a second mounting frame 600, both of which are annular, the third gear member 330 is installed at the circular edge of the second mounting frame 600 and is rotatably connected, the expansion rod 410 is installed on the first mounting frame 500, and the first mounting frame 500 is sleeved on the outside of the second mounting frame 600; by arranging the first mounting frame 500 to be sleeved on the second mounting frame 600, the rack will not loosen circumferentially when moving in the radial direction, ensuring that the rack portion 412 of the expansion rod 410 and the third gear member 330 are stably meshed and transmit power.

[0036] Specifically, a plurality of through holes are provided on the annular edge of the first mounting frame 500, and a central spoke portion 610 is fixedly connected to the inside of the annular edge of the second mounting frame 600. The rack portion 412 is composed of two oppositely arranged racks. The third gear member 330 is located at the top of the spokes of the central spoke portion 610, and the spokes of the central spoke portion 610 pass through the rack portion 412. A plurality of 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 are meshed with the third gear member 330 on both sides of the third gear member 330, and the meshing transmission is smoother.

[0037] Specifically, the center of the first gear member 310 is fixedly connected to the rotating motor 200, the second gear member 320 is provided with a first meshing tooth 321 on the outer surface, and a second meshing tooth 322 on the inner surface, the third gear member 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 member 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 member 310 is in the form of an annular inner gear ring with a plurality of spoke skeletons fixed on the outer side, the second gear member 320 is in the form of an annular gear ring with meshing teeth both inside and outside, and the third gear member 330 is in the form of two gears of the same size fixed as one in the axial direction, and a space avoidance gap is provided between the two gears.

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

[0039] Specifically, it also includes a supporting shell 700, and the propulsion motor 100 is connected to the rotating motor 200 through the supporting shell 700. The surface of the supporting shell 700 is also provided with an anchoring portion 710 and a first elastic member 720. The anchoring portion 710 is used to install an external towing rope, and the first elastic member 720 is used to contact the inner wall of the pipeline and support the supporting shell 700; the first elastic member 720 can change elastically according to the different inner diameters of the inner tube, to ensure stable contact with the inner wall of the inner tube, to provide support for the rotating motor 200, and the shape of the anchoring portion 710 can stably hang the towing 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 connected, and the inner surface of the outer tube to be connected, and the limit member 420 is installed on the rack of the rack part 412 and meshed and fixed according to actual needs, and then the propulsion motor 100 is fixed inside the inner tube to be connected, 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 inner tube to be connected, and then the rotating motor 200 is started, and the rotating motor 200 drives the first gear member 310, the second gear member 320, and the third gear member 330 in sequence, and finally drives the rack part 412 to cause the expansion part 411 to displace in the radial direction, compressing the inner diameter of the inner tube to be connected, and stopping the compression when the outer surface of the expansion rod 410 can enter the inner part of the outer tube to be connected, and using external force to push the entire inner tube and the expansion mechanism 400 into the outer tube to be connected, and then the motor is rotated in the opposite direction, and the expansion rod 410 The top outer surface expands and squeezes the inner wall of the outer tube to increase the inner diameter of the outer tube, and then an external force is used to push the entire inner tube so that the inner tube gradually extends into the outer tube. Since both the inner tube and the outer tube are elastic, during the process of the inner tube extending into the outer tube, the inner tube recovers its deformation and increases its outer diameter, and the outer tube is squeezed and deformed to increase its inner diameter. When the expansion rod 410 moves forward with the inner tube, the inner wall of the outer tube behind the expansion rod 410 breaks away from the expansion rod 410 and then recovers its deformation and decreases its inner diameter, so that the inner tube and the outer tube are squeezed against each other and fit tightly under the action of the sealant. When the expansion rod 410 moves to the required distance, the inner tube is stopped from being pushed forward. At this time, the rotating motor 200 is reversed and the telescopic motor is started. The expansion rod 410 squeezes the inner wall of the inner tube so that there is a gap between the inner and outer tubes. The telescopic motor pushes the rotating motor 200, thereby pushing the entire expansion mechanism 400, so that the expansion rod 410 is separated from the interface between the inner and outer tubes. Finally, the tow rope is fixed on the anchoring part 710, and the entire device is towed out of the tube.

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

[0043] Example 2

[0044] This embodiment is a second embodiment of a through-type double-pipe expansion sealing device. Figure 2 and 3 As shown, the difference from the first embodiment is that:

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

[0046] The working principle of a through-type double-pipe expansion and sealing device in this embodiment is as follows: during the process of continuous insertion of the inner tube and expansion rod 410 expanding the outer tube, cylinder 820 is connected to an external pressurizing device, and the inner wall of the inner tube is continuously squeezed by pressurization and decompression, so that the sealant in the expansion part 411 is squeezed toward the surroundings, 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 portion 411 expands the outer wall of the outer tube outward, the extrusion sheet 830 squeezes the inner wall of the inner tube outward, squeezing the sealant in the expansion portion 411 toward the surroundings, ensuring that the sealant can stably bond and seal the inner and outer tubes; after the expansion portion 411 separates from the interface of the inner and outer tubes, due to the elastic extrusion of the inner and outer tubes, the sealant can also flow from more areas to less areas, forming a stable sealing fit.

[0048] Example 3

[0049] This embodiment is a second embodiment of a through-type double-pipe expansion sealing device. Figure 1 and 5 As shown, the difference from the first embodiment is that:

[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 member 310 through the connecting rod 1000. The support mechanism 900 provides rigid support for the entire expansion mechanism 400 on the side of the first transmission member away from the rotating motor 200.

[0051] Specifically, the support mechanism 900 includes a plurality of support members 910, a support center block 920, a second elastic member 930 and a third elastic member 940. One end of the support member 910 is rotatably connected to the support center block 920. The support members 910 are arranged in parallel in 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, which is installed between the two parallel 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 placed into the outer tube, the second elastic member 930 is elastically stretched, causing the support member 910 to rotate relative to the support center block 920, and the vertical distance between the end of the support member 910 and the support center block 920 is reduced, so that the radius of the end of the support member 910 adapts to the outer tube, and the support mechanism 900 is smoothly placed into the outer tube, so that the third elastic member 940 contacts the inner wall of the outer tube. During the expansion process of the expansion mechanism 400, the contact between the support member 910 and the inner wall of the outer tube provides support for the expansion mechanism 400.

[0054] Beneficial effects of this embodiment: the setting of the support member 910 can provide support for the entire device in the outer tube, making the expansion more stable, and 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 contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they 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 embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A through-type double-pipe expansion and sealing device, characterized in that: The invention comprises a propulsion motor (100), a rotation motor (200) and an expansion mechanism (400), wherein the telescopic shaft of the propulsion motor (100) is in contact with and connected to the bottom of the rotation motor (200), and the expansion mechanism (400) comprises a transmission assembly (300) and an expansion rod (410), wherein the rotation motor (200) is fixedly connected to one end of the transmission assembly (300), and the expansion rod (410) is meshed with the other end of the transmission assembly (300).

2. A through-type double-pipe expansion and sealing device according to claim 1, characterized in that: The transmission assembly (300) comprises a first gear member (310), a second gear member (320) and a third gear member (330); the expansion rod (410) comprises an expansion portion (411) and a rack portion (412); the output shaft of the rotating motor (200) is fixedly connected to one end of the first gear member (310); one end of the second gear member (320) is meshed with the other end of the first gear member (310); one end of the third gear member (330) is meshed with the other end of the second gear member (320); and the other end of the third gear member (330) is meshed with the rack portion (412).

3. A through-type double-pipe expansion and sealing device according to claim 2, characterized in that: The invention also comprises a first mounting frame (500) and a second mounting frame (600), wherein the first mounting frame (500) and the second mounting frame (600) are both annular, the third gear member (330) is mounted on the circular edge of the second mounting frame (600) and is rotatably connected, the expansion rod (410) is mounted on the first mounting frame (500), and the first mounting frame (500) is sleeved outside the second mounting frame (600).

4. A through-type double-pipe expansion and sealing device according to claim 3, characterized in that: The annular edge of the first mounting frame (500) is provided with a plurality of through holes, the annular edge of the second mounting frame (600) is also fixedly connected with a central spoke portion (610), the rack portion (412) is composed of two racks arranged opposite to each other, the third gear member (330) is located at the top of the spokes of the central spoke portion (610), and the spokes of the central spoke portion (610) are located between the two racks of the rack portion (412).

5. The through-type double-pipe expansion and sealing device according to claim 2, characterized in that: The center of the first gear member (310) is fixedly connected to the rotating motor (200); the outer surface of the second gear member (320) is provided with a first meshing tooth (321), and the inner surface is provided with a second meshing tooth (322); the third gear member (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 member (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).

6. A through-type double-pipe expansion and sealing device according to claim 2, characterized in that: The expansion mechanism (400) further comprises a limiting member (420), wherein the limiting member (420) is mounted on the rack portion (412) and meshes with the rack portion (412).

7. The through-type double-pipe expansion and sealing device according to claim 1, characterized in that: It also includes a supporting shell (700), the propulsion motor (100) and the rotating motor (200) are in contact and connected via the supporting shell (700), and the surface of the supporting shell (700) is also provided with an anchoring portion (710) and a first elastic member (720), the anchoring portion (710) is used to install an external towing rope, and the first elastic member (720) is used to contact the inner wall of the pipeline and support the supporting shell (700).

8. The through-type double-pipe expansion and sealing device according to claim 1, characterized in that: The invention also includes an extrusion mechanism (800), wherein the extrusion mechanism (800) is installed between the rotating motor (200) and the expansion mechanism (400), and the extrusion mechanism (800) includes a housing (810), a cylinder (820) and an extrusion sheet (830), wherein the cylinder (820) is installed in the housing (810), and the extrusion sheet (830) is fixedly connected to the piston of the cylinder (820).

9. A through-type double-pipe expansion and sealing device according to any one of claims 1 to 8, 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 member (310) via the connecting rod (1000).

10. A through-type double-pipe expansion and sealing device according to claim 9, characterized in that: The support mechanism (900) includes a plurality of support members (910), a support center block (920), a second elastic member (930) and a third elastic member (940). One end of the support member (910) is rotatably connected to the support center block (920). The support members (910) are arranged in parallel in the axial direction of the support center block (920). The second elastic member (930) is installed between the two 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).

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