Duct plug, duct plugging system, device with a sealed hole, and method for plugging a duct

Abstract

The present invention belongs to the technical field of pipe system plugging accessories and pipe plugs, and specifically relates to a channel plugger, a channel plugging system, a device with a sealing hole, and a channel plugging method. The channel plugger includes a sealing sleeve and an inner core pre-placed therein, the sealing sleeve having a closed barrier end face at the distal end and an extruded side wall extending from the edge, the extruded side wall having a conical inner surface, and the inner core having a conical outer surface and an axial threaded hole. An axial tensile force is applied by screwing a pulling tool into the threaded hole, so that the conical surfaces are squeezed against each other to cause the sealing sleeve to expand radially to achieve channel sealing. The channel plugger can be equipped with a rivet nut gun to perform convenient and reliable channel plugging operations. The channel plugging technology is suitable for industrial products such as electric drive devices, injection molds, power battery modules, etc. that require sealed straight holes. It has high sealing reliability, convenient operation, and clean sealing characteristics, and effectively solves the problems of debris contamination and sealing failure in traditional plugging processes.

Description

Technical Field

[0001] The present invention belongs to the technical field of pipe system plugging fittings and pipe plugs, and specifically relates to a hole plugging device, a hole plugging system, a device with a sealed hole, and a method for plugging a hole. Background Art

[0002] Hole plugging devices are widely used in fields such as mechanical manufacturing, the automotive industry, and energy facilities. In the field of mechanical manufacturing, they are used to seal various process holes to maintain system integrity; in the automotive industry, to ensure reliable sealing of key channels such as oil and gas pipelines; in energy equipment, they need to withstand the dynamic loads of high-pressure media to ensure transportation stability. In recent years, hole plugging devices have become an important basic component in the sealing link of industrial equipment due to their multi-scenario adaptability, functionality, and operational convenience.

[0003] The sealing performance and structural reliability of hole plugging devices, as core technical indicators to ensure industrial production safety, have always been one of the important improvement directions in the industry. Specifically, in the field of high-pressure hydraulic systems, oil leakage will cause a sudden drop in system pressure and power transmission failure, resulting in a decline in equipment operation efficiency and failures; in application scenarios involving the sealing of flammable, explosive, or toxic media, plugging failure may trigger major safety accidents such as fires and explosions, directly threatening the lives and health of personnel and the property safety of enterprises.

[0004] Operational convenience, as an important technical indicator for optimizing industrial production processes, has an important impact on the efficiency of hole plugging operations, and is therefore also one of the important improvement directions for hole plugging devices. Specifically, the hole plugging device should preferably adapt to the standard straight hole form, eliminating auxiliary structures such as anti-slip steps or limit grooves to simplify the hole processing technology. Secondly, the hole plugging device should preferably be in a ready-to-use functional state at all times, eliminating on-site assembly steps and the resulting process uncertainties. Thirdly, the actuator for hole plugging operations should preferably be compatible with common industrial tools. Currently, pull-off type hole plugging devices and hole plugging devices operated by threaded tie rods already have mature supporting tools. The pull-off type hole plugging device is as introduced in patent CN111828631A, and the hole plugging device operated by threaded tie rods is as introduced in patent CN117781076A.

[0005] In some application scenarios with high cleanliness requirements, such as medical equipment, food processing production lines, biopharmaceutical systems, and semiconductor manufacturing equipment, the cleanliness of hole plugging becomes a key performance indicator. In such scenarios, micron-sized debris generated during the plugging process may pose risks such as product contamination and failure of precision components. In traditional plugging technologies, plugging methods such as screwing in, knocking in, and expanding by pulling are prone to generating microparticles due to metal-to-metal friction and leaving residues inside the hole.

[0006] Therefore, it is of great practical significance to develop a channel plugging device and a plugging method that take into account high-reliability sealing, operational convenience, and cleanliness and pollution-free. Summary of the Invention

[0007] Aiming at the deficiencies of the prior art, the present invention provides a channel plugging device, a channel plugging system, a device with a sealed hole, and a method for plugging a channel.

[0008] In a first aspect of the present invention, a channel plugging device is provided, which includes a sealing sleeve that can be inserted into the channel and a core pre-held in the sealing sleeve; the sealing sleeve has a closed barrier end face at the distal end and an expanding side wall extending from the edge of the barrier end face towards the proximal end, and an opening is also provided at the proximal end of the sealing sleeve to allow an external pulling tool to reach the core inside the sealing sleeve; at least part of the inner surface of the expanding side wall is a conical inner surface; in the direction towards the proximal end, the radial dimension of the conical inner surface decreases, and the thickness of the expanding side wall where the conical inner surface is located increases; the core has an outer surface on the circumferential side, at least part of which is a conical outer surface, and the radial dimension of the conical outer surface decreases in the direction close to the proximal end; the core has an axially arranged threaded hole for threaded cooperation connection with the pulling tool; when plugging the channel, the core moves relative to the sealing sleeve towards the proximal end under the action of pulling force, causing the conical outer surface to squeeze the conical inner surface, resulting in the radial expansion of the sealing sleeve to squeeze the inner wall of the channel. Based on the above structure, the beneficial effects of the channel plugging device include: being able to take into account high-reliability sealing, operational convenience, and ensuring the cleanliness and pollution-free inside the channel.

[0009] As a further optimized solution of the channel plugging device, the threaded hole axially penetrates the core. This structure can balance the internal and external air pressures of the channel plugging device and eliminate the influence of the pressure difference on the connection stability.

[0010] As a further optimized solution of the channel plugging device, part of the outer surface on the circumferential side of the core is a cylindrical outer surface, and the cylindrical outer surface is connected to the distal end of the conical outer surface; part of the inner surface of the expanding side wall is a cylindrical inner surface, and the cylindrical inner surface is connected to the distal end of the conical inner surface. By providing additional frictional resistance through cylindrical surface fitting, the anti-vibration and anti-impact stability of the core and the sealing sleeve is improved.

[0011] As a further optimized solution of the channel plugging device, the barrier end face and the expanding side wall are connected by an outer transition to form an annular guiding transition surface. This structure can reduce the risk of scratching the inner wall of the channel by the edge.

[0012] As a further optimized solution of the channel plugging device, the included angle ∠A between the generatrix of the conical outer surface of the core and the axis is preferably in the range of 1.5° to 9.5°.

[0013] The second aspect of the present invention provides a channel plugging system, including the above-mentioned channel plugger and a rivet nut gun as a pulling tool; the rivet nut gun has a gun head and a threaded pull rod, and the threaded pull rod can rotate circumferentially and extend axially relative to the gun head.

[0014] As a further optimization scheme of the channel plugging system, the edge of the proximal surface of the inner core has a locking portion protruding toward the proximal end; the proximal surface of the sealing sleeve is transitionally connected to the inner surface of the extruded side wall to form a trumpet-shaped expansion surface open toward the proximal end; the end of the gun head has a contact end surface for contacting the proximal surface of the sealing sleeve, and an annular guide slope protruding toward the distal end is also formed on the contact end surface; when the channel is blocked, the contact end surface contacts the proximal surface of the sealing sleeve, and a gap is formed between the guide slope and the expansion surface, and the locking portion is at least partially squeezed into the gap and expanded radially. The mechanical interlocking structure is formed by this radial expansion, which significantly improves the stability of the channel plugger against vibration and impact.

[0015] As a further optimization solution for the pore blocking system, there are multiple locking parts, which are arranged in a ring along the edge of the proximal end surface of the inner core. This split locking structure can reduce eversion resistance and enhance interlocking strength.

[0016] The third aspect of the present invention provides a variety of devices with sealed channels, including at least one part having an outer surface and extending inward from the outer surface to form a channel, and any of the above-mentioned channel pluggers is installed in the channel. For example, the device with a sealed channel is an electric drive device and an electric vehicle having such an electric drive device, an injection mold, a power battery module and a new energy vehicle including such a module, an internal combustion engine cylinder block and a power device having such an internal combustion engine cylinder block, etc.

[0017] Taking the electric drive housing of an electric vehicle as an example, a channel is formed on the electric drive housing and is connected to the internal coolant channel or the reducer lubricating oil circuit; the channel plugger is sealed and installed in the channel to isolate the coolant channel or the lubricating oil circuit from the external environment of the electric drive housing.

[0018] The fourth aspect of the present invention provides a pore plugging method, which uses the above-mentioned pore plugger to quickly achieve straight hole sealing through conventional tools, is easy to operate, can achieve debris isolation, and ensure that the inside of the pore is clean and pollution-free. The plugging operation mainly includes the following steps:

[0019] Step A1: inserting a channel blocker into the channel to be blocked, with the distal end of the channel blocker facing the inside of the channel;

[0020] Step A2: Use a pulling tool to contact the proximal end of the sealing sleeve and apply a pulling force directed toward the proximal end to the threaded hole, pulling the inner core to move toward the proximal end relative to the sealing sleeve, so that the sealing sleeve expands radially and squeezes and fits tightly against the inner wall of the hole;

[0021] Step A3: Remove the pulling tool to complete the plugging of the hole.

[0022] For the hole plugging device with a locking part, the locking part and the guiding slope are interlocked to enhance stability, and a rivet nut gun is used for the plugging operation, which mainly includes the following steps:

[0023] Step B1: Align the proximal end of the hole plugging device with the gun head of the rivet nut gun, so that the threaded pull rod exposed from the gun head abuts against the proximal end of the threaded hole;

[0024] Step B2: Rotate the threaded pull rod and screw it into the threaded hole until the proximal end face of the sealing sleeve abuts against the abutting end face of the gun head;

[0025] Step B3: Move the rivet nut gun to place the hole plugging device loaded at the gun head into the hole to be plugged, with the distal end of the hole plugging device facing the inside of the hole;

[0026] Step B4: The threaded pull rod retracts relative to the gun head, pulling the inner core to move proximally relative to the sealing sleeve, causing the sealing sleeve to expand radially and have an interference fit with the inner wall of the hole, and at least part of the locking part is squeezed and filled into the gap formed between the guiding slope and the expanding surface;

[0027] Step B5: Rotate the threaded pull rod and screw it out of the threaded hole to complete the plugging of the hole.

[0028] Preferably, in Step B3, make the abutting end face of the rivet nut gun abut against the end face where the hole opening is located. Brief Description of the Drawings

[0029] Figure 1 It is a schematic structural diagram of the hole plugging device in Embodiment 1.

[0030] Figure 2 It is a schematic structural diagram of the sealing sleeve in Embodiment 1.

[0031] Figure 3 It is a schematic structural diagram of the inner core in Embodiment 1.

[0032] Figure 4 It is a schematic structural diagram of the hole to be plugged in Embodiment 1.

[0033] Figure 5 It is a schematic structural diagram of the hole plugging device in Embodiment 2.

[0034] Figure 6 It is a schematic structural diagram of the sealing sleeve in Embodiment 2.

[0035] Figure 7 It is a schematic structural diagram of the inner core in Embodiment 2.

[0036] Figure 8 It is a schematic structural diagram of the hole plugging device in Embodiment 3.

[0037] Figure 9 It is a schematic structural diagram of the sealing sleeve in Example 3.

[0038] Figure 10 It is a schematic structural diagram of the inner core in Example 3.

[0039] Figure 11 It is a schematic structural diagram of the expanded pore plug in Example 3.

[0040] Figure 12 It is a schematic structural diagram of the inner core with discontinuous locking parts in Example 3.

[0041] Figure 13 It is a schematic structural diagram of a blind rivet nut gun.

[0042] Figure 14 It is a schematic diagram of the state corresponding to plugging step B1.

[0043] Figure 15 It is a schematic diagram of the state corresponding to plugging step B2.

[0044] Figure 16 It is a schematic diagram of the state corresponding to plugging step B3.

[0045] Figure 17 It is a schematic diagram of the state corresponding to plugging step B4.

[0046] Figure 18 It is a schematic diagram of the state corresponding to plugging step B5.

[0047] Figure 19 It is a schematic structural diagram of the tube blank used to manufacture the sealing sleeve in Example 7.

[0048] Figure 20 It is a schematic diagram of the state of placing the inner core into the internal cavity of the tube blank in Example 7.

[0049] Figure 21 It is a schematic diagram of the state of placing the tube blank in the extrusion die in Example 7.

[0050] Figure 22 It is a schematic diagram of the state of the tube blank after being shaped by the extrusion die in Example 7.

[0051] In the figure, 1 is a sealing sleeve; 2 is an inner core; 4 is a tube blank; 5 is an extrusion die; 9 is a blind rivet nut gun; 11 is a barrier end face; 12 is an expanded side wall; 13 is a conical inner surface; 14 is a cylindrical inner surface; 15 is an expansion surface; 16 is a guiding transition surface; 21 is a conical outer surface; 22 is a threaded hole; 23 is a cylindrical outer surface; 24 is a locking portion; 41 is a tube bottom; 42 is a tube wall; 51 is a shaping channel; 52 is a shaping cone opening; 91 is a gun head; 92 is a threaded pull rod; 421 is an outer conical surface; 911 is a contact end face; 912 is a guiding slope face. Detailed implementation manners

[0052] The present invention will be further clarified below through specific embodiments. These embodiments are exemplary and are intended to illustrate and explain the present invention, rather than being a limitation.

[0053] For the convenience of describing and understanding the structure of the pore plugging device, the proximal end and the distal end are defined with reference to the user. One end that is exposed outward after plugging the pore, that is, the end facing the user, is the proximal end, and the end facing the internal medium inside the pore is the distal end.

[0054] Embodiment 1

[0055] As Figures 1 to 4 shown, a pore plugging device includes a sealing sleeve 1 that can be placed into the pore and an inner core 2 pre-held inside the sealing sleeve 1. Before using the pore plugging device to plug the pore, the inner core 2 has been assembled inside the sealing sleeve 1 to form an assembly. When plugging the pore, the inner core 2 is axially moved relative to the sealing sleeve 1, so that the sealing sleeve 1 expands radially and is mutually extruded with the inner wall of the pore to be plugged, forming an interference fit sealing effect.

[0056] Among them, the inner core 2 is preferably configured to have a higher hardness relative to the sealing sleeve 1, so as to have higher compressive strength and structural stability, and can cause plastic deformation to mainly occur in the sealing sleeve 1 when being extruded with the sealing sleeve 1. Correspondingly, the sealing sleeve 1 is more easily deformed, and when being radially extruded by the inner core 2, it adaptively fits with the inner wall of the pore, thereby forming a continuous contact sealing interface in the circumferential direction.

[0057] As Figure 2 shown, the sealing sleeve 1 is integrally formed. Its distal end has a flat and closed barrier end face 11, and its proximal end is provided with an opening. The expanded side wall 12 extends from the periphery of the barrier end face 11 towards the proximal end to form a thin-walled tubular structure. At least part of the inner surface of the expanded side wall 12 is a conical inner surface 13. For example, Figure 2 as shown in the figure, a conical inner surface 13 is formed near the distal end, and an equal-diameter cylindrical surface is formed near the proximal end. The thickness of the expanded side wall 12 where the conical inner surface 13 is located increases from the distal end to the proximal end; the cavity surrounded by the barrier end face 11 and the expanded side wall 12 is used to pre-hold the inner core 2.

[0058] As Figure 3 shown, the inner core 2 is generally columnar in shape as a whole, and it has an outer surface on its circumferential side, at least part of which is a conical outer surface 21. For example Figure 3 as shown in [reference], its outer surface is basically all conical outer surface 21, and the radial dimension of this conical outer surface 21 decreases in the direction pointing to the proximal end.

[0059] As Figure 3 shown, the inner core 2 has an axially arranged threaded hole 22, and this threaded hole 22 can be threadedly mated and connected with a pulling tool so that the pulling tool applies an axial pulling force to the inner core 2.

[0060] Before plugging the hole passage, the hole passage plug forms a pre-assembled state as Figure 1 shown. At this time, a pulling tool is used to apply an axial pulling force to the inner core 2. Under the action of the pulling force, the inner core 2 moves proximally relative to the sealing sleeve 1, causing a wedge-shaped extrusion between the conical outer surface 21 and the conical inner surface 13, converting the axial pulling force into a radial expansion force, causing the sealing sleeve 1 to expand radially, squeezing the inner wall of the hole passage, and plugging the hole passage to form a plugging state as Figure 4 shown.

[0061] Based on the above structure, this hole passage plug can take into account high sealing reliability, operation convenience and clean plugging characteristics, as follows.

[0062] This hole passage plug can achieve highly reliable sealing. As described above, the hole passage plug adopts a dual-component integrated design, and only includes two main structures, the sealing sleeve 1 and the inner core 2. In terms of the mating relationship, internally, a wedge-shaped fit is formed between the conical inner surface 13 of the sealing sleeve 1 and the conical outer surface 21 of the inner core 2, and externally, a continuous annular contact with the inner wall of the hole passage is formed by the radial expansion of the sealing sleeve 1. This extremely simple structural design reduces the number of mating interfaces, reduces the assembly verification links and potential failure points. In addition, this hole passage plug only forms a single annular contact interface on the outer periphery, and uses the wedge-shaped extrusion between the conical surfaces to convert the axial pulling force into a radially expanding force magnified by dozens of times, causing the sealing sleeve 1 to produce a plastic deformation that adapts to the inner wall of the hole passage, forming a high-strength and high-density extrusion seal, reducing the leakage risk. Therefore, it can be applied to long-term sealing under high-pressure conditions.

[0063] This hole passage plug has excellent operation convenience. During use, no on-site assembly is required. Only a conventional hand-held electric tool, the rivet nut gun 9, can be used to complete the operation. There is no need to machine a step structure to prevent axial slip or set an anti-rotation limit structure in the hole passage. A common straight hole can complete reliable sealing, and it is easy to achieve different plugging states of the hole passage plug flush with, protruding from, or recessed from the end face where the hole passage is located according to actual needs.

[0064] The duct plug has excellent clean plugging characteristics. The sealing sleeve 1 and the inner wall of the duct are sealed by radial extrusion. There is no relative frictional movement between them, and no debris is generated. There is friction when the inner core 2 moves axially relative to the sealing sleeve 1. Even if a small amount of debris is generated, it is completely isolated outside the duct by the sealing sleeve 1, ensuring that the inside of the duct is free of debris and clean. After plugging, a regular plane can be formed facing the inside of the duct. There are no gaps or uneven structures in the plane, and it is not easy to accumulate dirt. Therefore, the duct plug can be applied to scenarios such as hydraulic systems, medical equipment, food processing, and sterile systems that have strict requirements for internal cleanliness.

[0065] Example 2

[0066] As Figures 5 to 7 shown, further optimization is carried out on the basis of the duct plug in Example 1.

[0067] The inner core 2 is as Figure 7 shown. The middle part of the outer surface on its circumferential side is a cylindrical outer surface 23, and the cylindrical outer surface 23 is connected to the distal end of the conical outer surface 21. As Figure 6 shown, part of the inner surface of the expanding side wall 12 is a cylindrical inner surface 14, and the cylindrical inner surface 14 is connected to the distal end of the conical inner surface 13. As Figure 5 shown, in the pre-assembled state, the cylindrical inner surface 14 corresponds to the cylindrical outer surface 23. During the plugging operation, after the intersection of the conical outer surface 21 and the cylindrical outer surface 23 presses against the inner surface of the sealing sleeve 1, an additional cylindrical inner surface will be formed on the inner surface of the sealing sleeve 1. A strong squeezing force and frictional force are generated between this newly formed inner surface and the cylindrical outer surface 23, which can be used to counteract the tendency of the inner core 2 to slip distally caused by the wedge-shaped extrusion between the inner core 2 and the sealing sleeve 1, providing greater redundancy for the connection stability between the inner core 2 and the sealing sleeve 1 and better adapting to harsh use environments such as vibration and shock.

[0068] Furthermore, as Figure 5 and Figure 6 shown, the blocking end face 11 of the sealing sleeve 1 and the expanding side wall 12 are connected in a transitional manner on the outside to form an annular guiding transitional surface 16. This transitional structure can play a guiding role when the plug is inserted into the duct, avoiding scratching the inner wall of the duct by the edges and generating debris contamination, and can also disperse the contact stress of this part on the inner wall of the duct.

[0069] The proximal end of the threaded hole 22 in the center of the inner core 2 is used to cooperate with a pulling tool, and the distal end can be closed or open. Preferably, as Figure 5 and Figure 7As shown, the threaded hole 22 axially penetrates the inner core 2, which can effectively prevent the formation of a low-pressure sealed cavity between the sealing sleeve 1 and the inner core 2 after the expansion operation. Through the through-type threaded hole 22, the internal and external air pressures are kept balanced, eliminating the pressure difference acting on the inner core 2 in the direction of the distal end caused by the internal negative pressure and the external normal pressure, which helps the inner core 2 and the sealing sleeve 1 to always maintain a stable fit state after plugging.

[0070] Preferably, the angle ∠A between the generatrix of the conical outer surface 21 of the inner core 2 and the axis is in the range of 1.5° to 9.5°, more preferably in the range of 2.0° to 8.5°, and even more preferably in the range of 2.5° to 7.5°.

[0071] Example 3

[0072] As Figures 8 to 11 shown, on the basis of the hole plugging device in Example 1, further optimization is carried out. At the edge of the proximal end face of the inner core 2, there is a locking portion 24 protruding towards the proximal end; between the proximal end face of the sealing sleeve 1 and the inner surface of the expansion side wall 12, a transition connection is formed to form a flared expansion surface 15 opening towards the proximal end. When plugging the hole, by pulling the inner core 2 towards the proximal end with a tool and turning the locking portion 24 at the proximal end of the inner core 2 outwards to squeeze and interlock with the flared expansion surface 15, it is prevented that the inner core 2 slips towards the distal end after plugging, significantly improving the connection stability between the inner core 2 and the sealing sleeve 1, and better adapting to harsh use environments such as vibration and impact.

[0073] The locking portion 24 at the proximal end of the inner core 2 can be a continuous and complete circle as Figures 8 to 11 shown, or it can be discontinuous. Preferably, there are multiple locking portions 24, which are arranged annularly along the edge of the proximal end face of the inner core 2. For example: two locking portions 24 are arranged with a 180° interval from each other, three locking portions 24 are arranged with a 120° interval from each other, four locking portions 24 are arranged with a 90° interval from each other, five locking portions 24 are arranged with a 72° interval from each other, six locking portions 24 are arranged with a 60° interval from each other, and so on. Figure 12 Schematically shows that there are three locking portions 24 at the proximal end of the inner core 2 with a 120° interval from each other. Although an interlocking effect can also be achieved by using a continuous circle of locking portions 24, using multiple annularly arranged locking portions 24 can reduce the resistance suffered during the outward turning of the locking portion 24, especially the resistance caused by the circumferential tensile force to the outward turning of the locking portion 24, enabling the locking portion 24 to turn outwards more fully and tightly interlock with the expansion surface 15, enhancing the stability of the locking structure.

[0074] Example 4

[0075] This embodiment introduces a duct plugging system, which includes a duct plugger in any form of the above embodiments, and also includes a blind rivet nut gun 9 as a pulling tool. Although any pulling tool that can force the inner core 2 to move proximally relative to the sealing sleeve 1 can be used for the plugging operation, it is more convenient to operate this duct plugging system in cooperation with the blind rivet nut gun 9, and the blind rivet nut gun 9 is also a general tool that is easily obtained and has a low cost in daily production.

[0076] As Figure 13 shown, the blind rivet nut gun 9 is a device widely used in industry for installing blind rivet nuts for fastening riveting. Currently, the widely used one is electric and can be operated by hand. The blind rivet nut gun 9 has a gun head 91 and a threaded pull rod 92. The threaded pull rod 92 can rotate circumferentially and telescopically axially relative to the gun head 91. The circumferential rotation of the threaded pull rod 92 can be conveniently screwed into the threaded hole 22 of the inner core 2 to achieve quick connection, and quickly screwed out from the threaded hole 22; the axial telescoping of the threaded pull rod 92 can conveniently apply an axial force to the inner core 2 to pull the inner core 2 inside the sealing sleeve 1 to move.

[0077] As Figure 14 shown, the end of the gun head 91 of the blind rivet nut gun 9 has a contact end face 911, which can contact and support the proximal end face of the sealing sleeve 1 during expansion, so that the inner core 2 moves proximally relative to the sealing sleeve 1. Further, a ring-shaped guiding slope 912 protruding distally can be formed on the contact end face 911. When the inner core 2 of the duct plugger has a locking portion 24, the guiding slope 912 can guide the locking portion 24 to expand radially, so that it is extruded and filled into the gap between the guiding slope 912 and the expansion surface 15, realizing the outward turning and locking of the guiding locking portion 24.

[0078] Embodiment 5

[0079] This embodiment introduces a method for using the blind rivet nut gun 9 to operate the duct plugger to plug the duct.

[0080] First, taking the duct plugger with a locking portion 24 as an example, it includes the following steps:

[0081] Step B1: Align the proximal end of the duct plugger with the gun head 91 of the blind rivet nut gun 9, so that the threaded pull rod 92 exposed from the gun head 91 abuts against the proximal end of the threaded hole 22, forming the Figure 14 shown state;

[0082] Step B2: Start the blind rivet nut gun 9 to rotate the threaded pull rod 92 and screw it into the threaded hole 22 until the proximal end face of the sealing sleeve 1 abuts against the contact end face 911 of the gun head 91, forming the Figure 15 shown state;

[0083] Step B3: Move the blind rivet nut gun 9 to place the duct plug loaded at the gun head 91 into the duct to be plugged, with the distal end of the duct plug facing the interior of the duct, forming Figure 16 the state shown;

[0084] Step B4: Start the blind rivet nut gun 9 to retract the threaded pull rod 92 relative to the gun head 91, pulling the inner core 2 to move proximally relative to the sealing sleeve 1, causing the sealing sleeve 1 to expand radially and be in interference fit with the inner wall of the duct, and causing at least a part of the locking portion 24 to be squeezed and filled into the gap formed between the guiding slope 912 and the expansion surface 15, forming Figure 17 the state shown;

[0085] Step B5: Start the blind rivet nut gun 9 to rotate the threaded pull rod 92 out of the threaded hole 22, forming Figure 18 the state shown, completing the plugging of the duct.

[0086] Preferably, in Step B3, make the abutting end surface 911 of the blind rivet nut gun 9 abut against the end surface where the duct opening is located, so that after plugging, the end surface where the duct is located is flush with the end surface of the duct plug, which is more regular and beautiful. In addition, according to needs, the abutting end surface 911 of the blind rivet nut gun 9 can also be made to leave a distance from the end surface where the duct opening is located, so that the duct plug after plugging protrudes relative to the end surface where the duct is located; according to needs, a gun head 91 with a smaller radial dimension can also be used, so that the gun head 91 can extend into the duct, so that the duct plug after plugging is retracted relative to the end surface where the duct is located.

[0087] For the duct plug without the locking portion 24 on the inner core 2, using the blind rivet nut gun 9 to plug mainly includes the following steps:

[0088] Step A1: Place the duct plug into the duct to be plugged, with the distal end of the duct plug facing the interior of the duct;

[0089] Step A2: Use a pulling tool to abut against the proximal end of the sealing sleeve 1 and apply a pulling force pointing proximally to the threaded hole 22, pulling the inner core 2 to move proximally relative to the sealing sleeve 1, causing the sealing sleeve 1 to expand radially and be tightly fitted with the inner wall of the duct by extrusion;

[0090] Step A3: Remove the pulling tool to complete the plugging of the duct.

[0091] Embodiment 6

[0092] This embodiment introduces a device with a sealed duct, which includes at least one part having an outer surface and a duct extending inward from the outer surface, and any one type of the duct plugs in the above embodiments is installed in the duct.

[0093] For example, the device with the sealed channel is an electric drive device and an electric vehicle having such an electric drive device. The electric drive device has an electric drive housing, and the channel is formed on the electric drive housing and communicates with the internal coolant channel or the lubricating oil path of the reducer; the channel plug is sealingly installed in the channel for isolating the coolant channel or the lubricating oil path from the external environment of the electric drive housing.

[0094] For example, the device with the sealed channel is an injection mold. A cooling flow path is provided inside the mold, and the channel plug is used to block the port channels that do not need to be directly connected to the external cooling circulation system, so as to achieve a closed seal at the end of the flow path.

[0095] For example, the device with the sealed channel is a power battery module and a new energy vehicle including such a module. The power battery module includes a housing part with a cooling flow path provided inside, and the channel plug is sealingly installed in the redundant interface channel, such as the redundant interface formed by the parallel branch of the cooling flow path or the test port.

[0096] For example, the device with the sealed channel is an internal combustion engine cylinder block and a power device having such an internal combustion engine cylinder block. The channel plug is sealingly installed in the process hole formed during the casting of the cylinder block part.

[0097] Embodiment 7

[0098] This embodiment introduces a manufacturing method of the channel plug in any of the above forms. According to the shape of the inner core 2, the inner core 2 is manufactured by machining or material deformation processing. The cylinder blank 4 is manufactured by machining or material deformation processing. As shown in Figure 19 , the cylinder blank 4 has a cylinder bottom 41 at the distal end and a cylinder wall 42 extending from the edge of the cylinder bottom 41 towards the proximal end; at least part of the outer surface of the cylinder wall 42 is machined into an outer conical surface 421; in the direction pointing to the proximal end, the radial dimension of the outer conical surface 421 increases, and the thickness of the cylinder wall 42 where the outer conical surface 421 is located increases. The inner core 2 is coaxially placed into the internal cavity of the cylinder blank 4, and the distal end surface of the inner core 2 abuts against the inner wall of the cylinder bottom 41. As shown in Figure 20 , only one form of the inner core 2 is taken as an example in the figure, and the same applies to other forms of the inner core 2. As shown in Figure 21 , the cylinder blank 4 assembled with the inner core 2 is placed on the extrusion die 5. The extrusion die 5 has a columnar shaping channel 51 and a flared shaping cone 52 at the end of the shaping channel 51. An axial thrust is applied to the proximal end of the inner core 2 to force the cylinder blank 4 to enter the shaping cone 52 and pass through the shaping channel 51. The shaping cone 52 forces the cylinder wall 42 to generate a radial contraction deformation, and the outer conical surface 421 is compressed to form a cylindrical surface, and the inner surface of the cylinder blank 4 is compressed into at least part of a conical shape. As shown in Figure 22 , finally, a pre-assembled body of the seal sleeve 1 and the inner core 2 is obtained.

[0099] The above embodiments are exemplary, aiming to illustrate the technical concept and features of the present invention, so that those skilled in this field can understand the content of the present invention and implement it accordingly. However, it should not be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A pore plugging system, characterized in that: It comprises a duct plugging device and a rivet nut gun (9) as a pulling tool; the rivet nut gun (9) comprises a gun head (91) and a threaded pull rod (92); the threaded pull rod (92) can rotate circumferentially and extend axially relative to the gun head (91); The channel plugging device comprises a sealing sleeve (1) which can be inserted into the channel and an inner core (2) pre-retained in the sealing sleeve (1); the sealing sleeve (1) has a closed barrier end face (11) at the distal end and an extruded side wall (12) extending from the edge of the barrier end face (11) to the proximal end, and the sealing sleeve (1) also has an opening at the proximal end to allow an external pulling tool to touch the inner core (2) in the sealing sleeve (1); the inner surface of the extruded side wall (12) is at least partially a conical inner surface (13); in the direction toward the proximal end, the radial dimension of the conical inner surface (13) decreases, and the conical The thickness of the extrusion side wall (12) where the inner surface (13) is located increases; the inner core (2) has a peripheral outer surface, at least part of which is a conical outer surface (21), and the radial dimension of the conical outer surface (21) decreases in the direction close to the proximal end; the inner core (2) has an axially arranged threaded hole (22) for threaded connection with a pulling tool; when the channel is blocked, the inner core (2) moves toward the proximal end relative to the sealing sleeve (1) under the action of a pulling force, causing the conical outer surface (21) to squeeze the conical inner surface (13), so that the sealing sleeve (1) radially expands and squeezes the inner wall of the channel; The edge of the proximal end surface of the inner core (2) is provided with a locking portion (24) protruding toward the proximal end; the proximal end surface of the sealing sleeve (1) is transitionally connected to the inner surface of the extrusion side wall (12), forming a trumpet-shaped expansion surface (15) open toward the proximal end; the end of the gun head (91) is provided with a contact end surface (911) for contacting the proximal end surface of the sealing sleeve (1), and an annular guide protruding toward the distal end is also formed on the contact end surface (911). The guide slope (912) is abutted against the proximal end surface of the sealing sleeve (1) when the channel is blocked, and a gap is formed between the guide slope (912) and the expansion surface (15). The inner core (2) is pulled toward the proximal end by a tool, and the locking portion (24) at the proximal end of the inner core (2) is turned outward and squeezed with the bell-shaped expansion surface (15) to form an interlocking, and the locking portion (24) is at least partially squeezed into the gap and expands radially.

2. The pore plugging system according to claim 1, wherein: The threaded hole (22) passes through the inner core (2) in the axial direction.

3. The pore plugging system according to claim 1, wherein: The middle portion of the outer surface of the circumferential side of the inner core (2) is a cylindrical outer surface (23), and the cylindrical outer surface (23) is connected to the distal end of the conical outer surface (21); the inner surface portion of the extruded side wall (12) is a cylindrical inner surface (14), and the cylindrical inner surface (14) is connected to the distal end of the conical inner surface (13).

4. The pore plugging system according to claim 1, wherein: The blocking end surface (11) and the extrusion side wall (12) are transitionally connected at the outside to form an annular guiding transition surface (16).

5. The pore plugging system according to claim 1, characterized in that: The included angle ∠A between the generatrix of the conical outer surface (21) of the inner core (2) and the axis is in the range of 1.5° to 9.5°.

6. The pore plugging system according to claim 1, wherein: There are multiple locking portions (24), which are arranged annularly along the edge of the proximal end surface of the inner core (2).

7. Device with a sealed channel, characterized in that: It includes at least one part having an outer surface and a duct formed by extending inward from the outer surface, and a duct plug is installed in the duct by using the duct plugging system according to any one of claims 1 to 6.

8. The device with a sealed channel according to claim 7, wherein: The part is the electric drive housing of an electric vehicle, and the duct is formed on the electric drive housing and communicates with the internal coolant passage or the reducer lubricating oil path; the duct plug is sealingly installed in the duct for isolating the coolant passage or the lubricating oil path from the external environment of the electric drive housing.

9. Method for plugging a pore passage, characterized in that: Using the duct plugging system according to any one of claims 1 to 6, it includes the following steps: Step B1: Align the proximal end of the duct plug with the gun head (91) of the rivet nut gun (9), so that the threaded pull rod (92) exposed from the gun head (91) abuts against the proximal end of the threaded hole (22); Step B2: The threaded pull rod (92) rotates and screws into the threaded hole (22) until the proximal end surface of the sealing sleeve (1) abuts against the abutting end surface (911) of the gun head (91); Step B3: Move the rivet nut gun (9) to place the duct plug loaded at the gun head (91) into the duct to be plugged, with the distal end of the duct plug facing the inside of the duct; Step B4: The threaded pull rod (92) retracts relative to the gun head (91), pulling the inner core (2) to move proximally relative to the sealing sleeve (1), causing the sealing sleeve (1) to expand radially and have an interference fit with the inner wall of the duct, and causing at least part of the locking portion (24) to be squeezed and filled into the gap formed between the guiding slope surface (912) and the expanding surface (15); Step B5: The threaded pull rod (92) rotates and unscrews from the threaded hole (22) to complete the plugging of the duct.

10. The pore plugging method according to claim 9, characterized in that: In step B3, make the abutting end surface (911) of the rivet nut gun (9) abut against the end surface where the duct opening is located.

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