Hole plugging device, hole plugging system, device with sealing hole and hole plugging method

Abstract

The invention belongs to the technical field of piping system plugging accessories and pipe plugs, and particularly relates to a hole channel plugging device, a hole channel plugging system, a device with a sealing hole and a hole channel plugging method. The hole channel plugging device comprises a sealing sleeve and an inner core preset in the sealing sleeve, the sealing sleeve is provided with a closed blocking end face at the far end and a squeezing and expanding side wall formed by extending from the edge, the squeezing and expanding side wall is provided with a conical inner surface, and the inner core is provided with a conical outer surface and an axial threaded hole. A pulling tool is screwed into the threaded hole to apply axial pulling force, so that the conical surfaces extrude each other to cause radial expansion of the sealing sleeve to realize hole channel sealing. The hole channel plugging device can be matched with a rivet nut gun to carry out convenient and reliable hole channel plugging operation. The hole channel plugging technology is suitable for industrial products needing straight hole sealing, such as electric driving devices, injection molds and power battery modules, has the characteristics of high sealing reliability, operation convenience and clean plugging, and effectively solves the problems of scrap pollution, sealing failure and the like of a traditional plugging technology.

Description

Technical Field

[0001] The invention belongs to the technical field of pipe system plugging accessories and pipe plugs, and in particular relates to a duct plugger, a duct plugging system, a device with a sealing hole and a duct plugging method. Background Art

[0002] Pore ​​plugs are widely used in the fields of machinery manufacturing, automobile industry, energy facilities, etc. In the field of machinery manufacturing, they are used to close various process holes to maintain system integrity; in the automobile industry, they ensure the reliable sealing of key channels such as oil circuits and gas circuits; in energy equipment, they need to withstand the dynamic load of high-pressure media to ensure transportation stability. In recent years, pore plugs have become an important basic component in the sealing process of industrial equipment due to their multi-scenario adaptability, functionality, and ease of operation.

[0003] The sealing performance and structural reliability of the channel plugger, as the core technical indicators to ensure the safety of industrial production, have always been one of the important improvement directions that the industry pays attention to. 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 reduced equipment operating efficiency and failure; in application scenarios involving the sealing of flammable, explosive or toxic media, plugging failure may cause major safety accidents such as fire and explosion, directly threatening the lives and health of personnel and the safety of corporate property.

[0004] As an important technical indicator for optimizing industrial production processes, ease of operation has a significant impact on the efficiency of channel plugging operations. Therefore, it is also one of the important directions for improving channel pluggers. Specifically, channel pluggers should be adapted to the standard straight hole form as much as possible, eliminating the need for auxiliary structures such as anti-slip steps or limit grooves, so as to simplify the process of channel processing. Secondly, channel pluggers should be in a functionally ready state as much as possible to eliminate on-site assembly links and the resulting process uncertainties. Thirdly, the actuators for plugging operations should be compatible with general industrial tools as much as possible. At present, the pull-off channel pluggers and the threaded pull rod-operated channel pluggers have mature supporting tools. The pull-off channel pluggers are described in patent CN111828631A, and the threaded pull rod-operated channel pluggers are described in patent CN117781076A.

[0005] In some application scenarios that require high cleanliness, such as medical equipment, food processing production lines, biopharmaceutical systems, and semiconductor manufacturing equipment, the cleanliness of the hole plugging becomes a key performance indicator. In such scenarios, the micron-level debris generated during the plugging process may cause risks such as product contamination and precision component failure. Traditional plugging technologies use plugging methods such as threaded screwing, knocking installation, and expansion, which are prone to generate particles due to metal-to-metal friction and remain inside the hole.

[0006] Therefore, it is of great practical significance to develop a channel plugger and plugging method that takes into account high-reliability sealing, convenient operation, and cleanliness and pollution-free. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention provides a pore plugger, a pore plugging system, a device with a sealing hole and a pore plugging method.

[0008] According to a first aspect of the present invention, there is provided a channel plugger, comprising a sealing sleeve which can be inserted into a channel and an inner core pre-retained in the sealing sleeve; the sealing sleeve has a closed barrier end face at the distal end and an extruded side wall extending from the edge of the barrier end face to the proximal end, and an opening is also provided at the proximal end of the sealing sleeve to allow an external pulling tool to touch the inner core in the sealing sleeve; the inner surface of the extruded side wall is at least partially a conical inner surface; in the direction toward the proximal end, the radial dimension of the conical inner surface decreases, and the thickness of the extruded side wall where the conical inner surface is located increases; the inner core has a circumferential outer surface, at least partially a conical outer surface, and the radial dimension of the conical outer surface decreases in the direction approaching the proximal end; the inner core has an axially arranged threaded hole for threaded connection with the pulling tool; when plugging the channel, the inner core moves proximally relative to the sealing sleeve under the action of tension, causing the conical outer surface to squeeze the conical inner surface, causing the sealing sleeve to radially expand and squeeze the inner wall of the channel. Based on the above structure, the beneficial effects of the channel plugger include: being able to take into account high-reliability sealing, convenient operation, and ensuring that the inside of the channel is clean and pollution-free.

[0009] As a further optimization solution for the channel plugger, the threaded hole penetrates the inner core in the axial direction. This structure can balance the air pressure inside and outside the channel plugger and eliminate the influence of the pressure difference on the connection stability.

[0010] As a further optimization solution for the channel plugger, the middle part of the outer surface of the inner core peripheral side is a cylindrical outer surface, which is connected to the distal end of the conical outer surface; the inner surface of the extruded side wall is a cylindrical inner surface, which is connected to the distal end of the conical inner surface. The cylindrical surface provides additional friction resistance to improve the vibration and impact resistance stability of the inner core and the sealing sleeve.

[0011] As a further optimization solution for the channel plugger, the blocking end face and the extrusion side wall are transitionally connected on the outside to form an annular guiding transition surface. This structure can reduce the risk of scratches on the inner wall of the channel by the edges.

[0012] As a further optimization solution for the channel plugger, the angle ∠A between the generatrix of the conical outer surface of the inner 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: 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; 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; Step A3: Remove the pulling tool to complete the blocking of the hole.

[0019] For a channel plugger with a locking portion, the locking portion and the guide slope are interlocked to enhance stability, and a rivet nut gun is used to perform the plugging operation, which mainly includes the following steps: Step B1: Align the proximal end of the channel plugger with the gun head of the rivet nut gun, so that the threaded rod exposed from the gun head contacts the proximal end of the threaded hole; Step B2: The threaded pull rod is rotated and screwed into the threaded hole until the proximal end surface of the sealing sleeve contacts the contact end surface of the gun head; Step B3: Move the rivet nut gun to place the hole plugger loaded on the gun head into the hole to be plugged, with the distal end of the hole plugger facing the inside of the hole; Step B4: the threaded pull rod is retracted relative to the gun head, pulling the inner core to move toward the proximal end relative to the sealing sleeve, so that the sealing sleeve is radially expanded to have an interference fit with the inner wall of the channel, so that the locking portion is at least partially squeezed and filled into the gap formed between the guide slope surface and the expansion surface; Step B5: The threaded pull rod is rotated and unscrewed from the threaded hole to complete the blocking of the hole.

[0020] Preferably, in step B3, the abutting end face of the rivet nut gun is made to abut against the end face where the channel opening is located. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the channel plugger in Example 1.

[0022] Figure 2 This is a schematic diagram of the structure of the sealing sleeve in Example 1.

[0023] Figure 3 This is a schematic diagram of the structure of the inner core in Example 1.

[0024] Figure 4 This is a schematic diagram of the structure of the blocked channel in Example 1.

[0025] Figure 5 This is a schematic diagram of the structure of the channel plugger in Example 2.

[0026] Figure 6 This is a schematic diagram of the structure of the sealing sleeve in Example 2.

[0027] Figure 7 This is a schematic diagram of the structure of the inner core in Example 2.

[0028] Figure 8 This is a schematic diagram of the structure of the channel plugger in Example 3.

[0029] Fig. 9 This is a schematic diagram of the structure of the sealing sleeve in Example 3.

[0030] Fig.10 This is a schematic diagram of the structure of the inner core in Example 3.

[0031] Fig.11 This is a schematic diagram of the structure of the channel plugger after expansion in Example 3.

[0032] Fig.12 Schematic diagram of the structure of the inner core with a discontinuous locking portion in Example 3.

[0033] Fig.13 It is a schematic diagram of the structure of a rivet nut gun.

[0034] Fig.14 It is a state diagram corresponding to the blocking step B1.

[0035] Fig.15 It is a state diagram corresponding to the blocking step B2.

[0036] Fig.16 It is a state diagram corresponding to the blocking step B3.

[0037] Fig.17 It is a state diagram corresponding to the blocking step B4.

[0038] Fig.18 It is a state diagram corresponding to the blocking step B5.

[0039] Fig.19 This is a schematic diagram of the structure of the tube blank used to manufacture the sealing sleeve in Example 7.

[0040] Fig. 20 This is a schematic diagram of the state of placing the inner core into the internal cavity of the tube blank in Example 7.

[0041] Fig.21 This is a schematic diagram of the state of the tube blank placed in the extrusion die in Example 7.

[0042] Fig. 22 This is a schematic diagram of the state of the tube blank after being shaped by the extrusion die in Example 7.

[0043] In the figure, 1, sealing sleeve; 2, inner core; 4, tube blank; 5, extrusion die; 9, rivet nut gun; 11, barrier end face; 12, extrusion side wall; 13, conical inner surface; 14, cylindrical inner surface; 15, expansion surface; 16, guide transition surface; 21, conical outer surface; 22, threaded hole; 23, cylindrical outer surface; 24, locking part; 41, tube bottom; 42, tube wall; 51, shaping channel; 52, shaping cone mouth; 91, gun head; 92, threaded pull rod; 421, outer cone surface; 911, resistance end face; 912, guide slope surface. DETAILED DESCRIPTION

[0044] The present invention is further illustrated by specific examples below. These examples are exemplary and are intended to illustrate the problem and explain the present invention, but are not intended to be limiting.

[0045] To facilitate description and understanding of the structure of the channel occluder, the proximal end and the distal end are defined with reference to the user. The end exposed to the outside after blocking the channel, that is, the end facing the user, is the proximal end, and the end facing the internal medium in the channel is the distal end.

[0046] Example 1 like Figures 1 to 4 The hole plugger shown comprises a sealing sleeve 1 that can be inserted into the hole and an inner core 2 pre-retained in the sealing sleeve 1. Before the hole plugger is used to plug the hole, the inner core 2 has been assembled in the sealing sleeve 1 to form an assembly. When plugging the hole, the inner core 2 is moved axially relative to the sealing sleeve 1, so that the sealing sleeve 1 expands radially and squeezes against the inner wall of the hole to be plugged, forming an interference fit sealing effect.

[0047] The inner core 2 is preferably configured to have a higher hardness than the sealing sleeve 1, so as to have higher compressive strength and structural stability, and when it is squeezed with the sealing sleeve 1, the plastic deformation can be mainly generated in the sealing sleeve 1. Correspondingly, the sealing sleeve 1 is easier to deform, and when subjected to the radial squeezing effect of the inner core 2, it can adaptably fit with the inner wall of the channel, thereby forming a continuous contact sealing interface in the circumferential direction.

[0048] like Figure 2 As shown, the sealing sleeve 1 is integrally formed, and its distal end has a flat closed barrier end face 11, and its proximal end is provided with an opening, and the extruded side wall 12 extends from the periphery of the barrier end face 11 to the proximal end to form a thin-walled tubular structure. The inner surface of the extruded side wall 12 is at least partially 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 a cylindrical surface of equal diameter is formed near the proximal end. The thickness of the extruded 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 surface 11 and the extruded side wall 12 is used to pre-hold the inner core 2.

[0049] like Figure 3 As shown, the inner core 2 is generally cylindrical and has an outer surface on the circumference, at least part of which is a conical outer surface 21, for example Figure 3 As shown in FIG. 1 , the outer surface thereof is basically a conical outer surface 21, and the radial dimension of the conical outer surface 21 decreases in the direction pointing to the proximal end.

[0050] like Figure 3 As shown, the inner core 2 has an axially arranged threaded hole 22 , and the threaded hole 22 can be threadedly connected with a pulling tool so that the pulling tool applies axial pulling force to the inner core 2 .

[0051] The pore plugger forms a Figure 1In the pre-assembled state shown in the figure, a pulling tool is used to apply axial pulling force to the inner core 2. Under the action of the pulling force, the inner core 2 moves toward the proximal end relative to the sealing sleeve 1, causing the tapered outer surface 21 and the tapered inner surface 13 to produce a wedge-shaped extrusion, converting the axial pulling force into a radial expansion force, causing the sealing sleeve 1 to expand radially, squeeze the inner wall of the channel, and block the channel, forming a Figure 4 The blocked state is shown.

[0052] Based on the above structure, the channel plugger can take into account high sealing reliability, convenient operation and clean plugging characteristics, as follows.

[0053] The channel plugger can achieve high-reliability sealing. As mentioned above, the channel plugger adopts a dual-component integrated design, which only includes two main structures: a sealing sleeve 1 and an inner core 2. In terms of the matching relationship, the tapered inner surface 13 of the sealing sleeve 1 forms a wedge-shaped match with the tapered outer surface 21 of the inner core 2, and the radial expansion of the sealing sleeve 1 forms a continuous annular contact with the inner wall of the channel. This minimalist structural design reduces the number of matching interfaces, reduces assembly verification links and potential failure points. In addition, the channel plugger only forms a single annular contact interface on the periphery, and utilizes the wedge-shaped extrusion effect between the conical surfaces to convert the axial tension into a radial expansion force that is amplified by dozens of times, so that the sealing sleeve 1 produces plastic deformation of the inner wall of the adaptive channel, forming a high-strength and high-density extrusion seal, reducing the risk of leakage, and is therefore suitable for long-term sealing under high-pressure conditions.

[0054] The hole plugging device has excellent operation convenience. When in use, it does not need to be assembled on site, and the operation can be completed using only a conventional handheld electric tool, a rivet nut gun 9. There is no need to process a step structure to prevent axial slippage or set an anti-rotation limit structure in the hole. Ordinary straight holes can complete reliable sealing, and it is easy to achieve different plugging states of the hole plugging device such as flush, protruding, and retracted relative to the end face of the hole according to actual needs.

[0055] The channel plugger has excellent clean sealing characteristics. The sealing sleeve 1 and the inner wall of the channel are sealed by radial extrusion. There is no relative friction movement between the two, and no debris is generated. There is friction between the inner core 2 and the sealing sleeve 1 when moving axially. Even if a small amount of debris is generated, it is completely isolated outside the channel by the sealing sleeve 1, ensuring that the inside of the channel is free of debris and clean. After the plugging is completed, a regular plane can be formed toward the inside of the channel, with no gaps or concave-convex structures in the surface, and it is not easy to hide dirt. Therefore, the channel plugger can be used in scenarios such as hydraulic systems, medical equipment, food processing and sterile systems that have strict requirements on internal cleanliness.

[0056] Example 2 like Figures 5 to 7 As shown, further optimization is performed on the basis of the pore blocker of Example 1.

[0057] Inner core 2 Figure 7 As shown, the middle part of the outer surface of the peripheral 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. Figure 6 As shown, 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. Figure 5 As shown, in the pre-assembled state, the cylindrical inner surface 14 corresponds to the cylindrical outer surface 23. During the plugging operation, the junction of the conical outer surface 21 and the cylindrical outer surface 23 squeezes the inner surface of the sealing sleeve 1 to form an additional cylindrical inner surface on the inner surface of the sealing sleeve 1. This newly formed inner surface and the cylindrical outer surface 23 generate strong squeezing force and friction force, which can be used to offset the tendency of the inner core 2 to slide toward the distal end caused by the wedge-shaped squeezing between the inner core 2 and the sealing sleeve 1, provide greater redundancy for the connection stability between the inner core 2 and the sealing sleeve 1, and better adapt to harsh use environments such as vibration and impact.

[0058] Furthermore, if Figure 5 and Figure 6 As shown, the blocking end face 11 of the sealing sleeve 1 is transitionally connected with the extruded side wall 12 at the outside to form an annular guiding transition surface 16. This transition structure can play a guiding role when the plugger is placed in the channel, avoiding the edge from scratching the inner wall of the channel and causing debris contamination, and can also disperse the contact stress of this part on the inner wall of the channel.

[0059] The threaded hole 22 in the center of the inner core 2 is used to cooperate with the pulling tool at the proximal end, and the distal end can be closed or open. Figure 5 and Figure 7 As shown, the threaded hole 22 passes through the inner core 2 in the axial direction, which can effectively avoid the formation of a low-pressure closed cavity between the sealing sleeve 1 and the inner core 2 after the expansion operation. The through-type threaded hole 22 keeps the internal and external air pressures balanced, eliminates the pressure difference directed to the distal end of the inner core 2 caused by the internal negative pressure and the external normal pressure, and helps the inner core 2 and the sealing sleeve 1 to always maintain a stable matching state after plugging.

[0060] Preferably, the angle ∠A between the generatrix of the tapered 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°.

[0061] Example 3 like Figures 8 to 11As shown, the channel plugger of Example 1 is further optimized. The edge of the proximal surface of the inner core 2 has a locking portion 24 protruding toward the proximal end; the proximal surface of the sealing sleeve 1 is transitionally connected to the inner surface of the extruded side wall 12 to form a trumpet-shaped expansion surface 15 open toward the proximal end. When plugging the channel, 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 trumpet-shaped expansion surface 15 to form an interlocking, preventing the inner core 2 from sliding toward the distal end after plugging, significantly improving the connection stability between the inner core 2 and the sealing sleeve 1, and can better adapt to harsh use environments such as vibration and impact.

[0062] The locking portion 24 at the proximal end of the inner core 2 may be as follows: Figures 8 to 11 The continuous and complete circle shown may also be discontinuous. Preferably, there are a plurality of locking portions 24, which are arranged in a ring along the edge of the proximal end surface of the inner core 2. For example, two locking portions 24 are arranged 180° apart from each other, three locking portions 24 are arranged 120° apart from each other, four locking portions 24 are arranged 90° apart from each other, five locking portions 24 are arranged 72° apart from each other, six locking portions 24 are arranged 60° apart from each other, and so on. Fig.12 The schematic diagram shows that three locking portions 24 spaced 120 degrees apart are provided at the proximal end of the inner core 2. Although the interlocking effect can be achieved by using a full circle of continuous locking portions 24, using multiple annularly arranged locking portions 24 can reduce the resistance encountered during the eversion of the locking portions 24, especially the resistance caused by the circumferential tension to the eversion of the locking portions 24, so that the locking portions 24 can be more fully everted and tightly interlocked with the expansion surface 15, thereby improving the stability of the locking structure.

[0063] Example 4 This embodiment introduces a channel plugging system, including any form of channel plugger in the above embodiments, and also including a 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 plugging operations, the channel plugging system is more convenient to operate with the rivet nut gun 9, and the rivet nut gun 9 is also a common tool that is easy to obtain and low in cost in daily production.

[0064] like Fig.13 As shown, the rivet nut gun 9 is a widely used instrument in the industry for installing rivet nuts for fastening and riveting. Currently, the widely used one is an electric one that can be hand-held. The rivet nut gun 9 has a gun head 91 and a threaded pull rod 92. The threaded pull rod 92 can rotate circumferentially and retract axially relative to the gun head 91. The threaded pull rod 92 can be easily screwed into the threaded hole 22 of the inner core 2 to achieve a quick connection, and can be quickly screwed out of the threaded hole 22; the threaded pull rod 92 can be easily retracted axially to apply an axial force to the inner core 2 to pull the inner core 2 in the sealing sleeve 1 to move.

[0065] like Fig.14 As shown, the end of the gun head 91 of the rivet nut gun 9 has a contact end surface 911, which can contact and support the proximal surface of the sealing sleeve 1 during tension and expansion, so that the inner core 2 moves toward the proximal end relative to the sealing sleeve 1. Furthermore, an annular guide slope 912 protruding toward the distal end can also be formed on the contact end surface 911. In the case where the inner core 2 of the channel plugger has a locking portion 24, the guide slope 912 can guide the locking portion 24 to expand radially, so that it is squeezed and filled into the gap between the guide slope 912 and the expansion surface 15, thereby realizing the eversion and locking of the guide locking portion 24.

[0066] Example 5 This embodiment introduces a method of using a rivet nut gun 9 to operate a channel plugger to plug a channel.

[0067] First, a duct plugger with a locking portion 24 is used as an example, and the following steps are included: Step B1: Place the proximal end of the channel plugger directly against the gun head 91 of the rivet nut gun 9, so that the threaded rod 92 exposed from the gun head 91 abuts against the proximal end of the threaded hole 22 to form a Fig.14 The status shown; Step B2: Start the rivet nut gun 9 to rotate the threaded pull rod 92 and screw it into the threaded hole 22 until the proximal end surface of the sealing sleeve 1 contacts the contact end surface 911 of the gun head 91, forming a Fig.15 The status shown; Step B3: Move the rivet nut gun 9 to place the hole plugger loaded at the gun head 91 into the hole to be plugged, with the distal end of the hole plugger facing the inside of the hole, forming a Fig.16 The status shown; Step B4: Start the rivet nut gun 9 to retract the threaded rod 92 relative to the gun head 91, pull the inner core 2 to move toward the proximal end relative to the sealing sleeve 1, so that the sealing sleeve 1 expands radially and fits with the inner wall of the channel, so that the locking portion 24 is at least partially squeezed and filled into the gap formed between the guide slope 912 and the expansion surface 15, forming Fig.17 The status shown; Step B5: Start the rivet nut gun 9 to rotate the threaded pull rod 92 out of the threaded hole 22 to form Fig.18 The state shown completes the blocking of the channel.

[0068] Preferably, in step B3, the abutting end face 911 of the rivet nut gun 9 abuts against the end face where the hole opening is located, so that the end face where the hole is located after blocking is flush with the end face of the hole plugger, which is more regular and beautiful. In addition, the abutting end face 911 of the rivet nut gun 9 can also be made to be a certain distance away from the end face where the hole opening is located, so that the hole plugger after blocking is protruding relative to the end face where the hole is located; the gun head 91 with a smaller radial size can also be used as needed, so that the gun head 91 can be extended into the hole, so that the hole plugger after blocking is retracted relative to the end face where the hole is located.

[0069] For a channel plugger without a locking portion 24 on the inner core 2, plugging using a rivet nut gun 9 mainly includes the following steps: 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; Step A2: Use a pulling tool to contact the proximal end of the sealing sleeve 1 and apply a pulling force directed toward the proximal end to the threaded hole 22, so as to pull the inner core 2 to move toward the proximal end relative to the sealing sleeve 1, so that the sealing sleeve 1 expands radially and squeezes and fits tightly against the inner wall of the hole; Step A3: Remove the pulling tool to complete the blocking of the hole.

[0070] Example 6 This embodiment introduces a device with a sealed channel, which includes at least one part having an outer surface and extending inward from the outer surface to form a channel, and a channel plugger of any type in the above embodiments is installed in the channel.

[0071] For example, the device with the sealed channel is an electric drive device and an electric vehicle with 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 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.

[0072] For example, the device with sealed channels is an injection mold, wherein a cooling channel is provided inside the mold, and the channel plugger is used to plug the port channel that does not need to be directly connected to the external cooling circulation system, thereby realizing a closed seal at the end of the channel.

[0073] For example, the device with sealed channels 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 channel arranged inside, and the channel plugger is sealed and installed in a redundant interface channel, such as a redundant interface formed by a parallel branch of the cooling channel or a test port.

[0074] For example, the device with sealed pores is an internal combustion engine cylinder block and a power device having such an internal combustion engine cylinder block. The pore plugging device is sealed and installed in the process hole formed in the cylinder block part during the casting process.

[0075] Example 7 This embodiment introduces a method for manufacturing a channel plugging device in any form of the above embodiments. According to the shape of the inner core 2, the inner core 2 is manufactured by machining or material deformation. The tube blank 4 is manufactured by machining or material deformation. Fig.19 As shown, the barrel blank 4 has a distal end bottom 41 and a barrel wall 42 extending from the edge of the barrel bottom 41 to the proximal end; the outer surface of the barrel wall 42 is at least partially processed into an outer cone 421; in the direction pointing to the proximal end, the radial dimension of the outer cone 421 increases, and the thickness of the barrel wall 42 where the outer cone 421 is located increases. The inner core 2 is coaxially placed into the inner cavity of the barrel blank 4, so that the distal end surface of the inner core 2 abuts against the inner wall of the barrel bottom 41, as shown in FIG. Fig. 20 As shown in the figure, only one form of inner core 2 is used as an example, and the same is true for other forms of inner core 2. Fig.21 As shown, the tube blank 4 equipped with the inner core 2 is placed on the extrusion die 5, and the extrusion die 5 has a columnar shaping channel 51, and a trumpet-shaped shaping cone 52 is provided at the end of the shaping channel 51. An axial thrust is applied to the proximal end of the inner core 2, forcing the tube blank 4 to enter the shaping cone 52 and pass through the shaping channel 51. The shaping cone 52 forces the tube wall 42 to produce radial contraction deformation, and the outer cone 421 is compressed to form a cylindrical surface, and the inner surface of the tube blank 4 is compressed into at least a partial cone, as shown in FIG. Fig. 22 As shown, a pre-assembled body of the sealing sleeve 1 and the inner core 2 is finally obtained.

[0076] The above embodiments are exemplary, and their purpose is to illustrate the technical concept and features of the present invention so that people familiar with the technology in this field can understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A pore plugging device, characterized in that: The invention comprises a sealing sleeve (1) which can be inserted into a hole and an inner core (2) which is 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) which extends from the edge of the barrier end face (11) to the proximal end, and the proximal end of the sealing sleeve (1) also has an opening 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 inner surface The thickness of the extrusion side wall (12) where the inner core (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 approaching 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 tension, causing the conical outer surface (21) to squeeze the conical inner surface (13), causing the sealing sleeve (1) to radially expand and squeeze the inner wall of the channel.

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

3. The pore plugging device according to claim 1, characterized in that: 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 device according to claim 1, characterized in that: 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 device 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 hole blocking system is characterized by: The invention comprises a duct plugger as claimed in any one of claims 1 to 5 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).

7. The pore blocking system according to claim 6, characterized in that: The edge of the proximal surface of the inner core (2) is provided with a locking portion (24) protruding toward the proximal end; the proximal 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 surface of the sealing sleeve (1), and an annular guide slope surface (912) protruding toward the distal end is also formed on the contact end surface (911); when the channel is blocked, the contact end surface (911) contacts the proximal surface of the sealing sleeve (1), a gap is formed between the guide slope surface (912) and the expansion surface (15), and the locking portion (24) is at least partially squeezed into the gap to expand radially.

8. The pore blocking system according to claim 7, characterized in that: The locking portions (24) are multiple and are arranged in a ring along the edge of the proximal end surface of the inner core (2).

9. A device having a sealed channel, characterized in that: The invention comprises at least one part having an outer surface and extending inwardly from the outer surface to form a channel, wherein the channel plugger according to any one of claims 1 to 5 is installed in the channel.

10. The device with a sealed channel according to claim 9, characterized in that: The part is an electric drive housing of an electric vehicle, the channel is formed on the electric drive housing and is connected to an internal coolant channel or a 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.

11. A pore blocking method, characterized in that: Using the pore blocker according to any one of claims 1 to 5 comprises the following steps: Step A1: placing the channel blocker into the channel to be blocked, with the distal end of the channel blocker facing the inside of the channel; Step A2: using a pulling tool to contact the proximal end of the sealing sleeve (1) and apply a pulling force directed toward the proximal end to the threaded hole (22), thereby pulling the inner core (2) to move toward the proximal end relative to the sealing sleeve (1), so that the sealing sleeve (1) expands radially and is squeezed and tightly fitted with the inner wall of the hole; Step A3: Remove the pulling tool to complete the blocking of the hole.

12. A pore blocking method, characterized in that: Using the pore blocking system according to claim 7 or 8 comprises the following steps: Step B1: the proximal end of the channel plugger is aligned 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) is rotated and screwed into the threaded hole (22) until the proximal end surface of the sealing sleeve (1) contacts the contact end surface (911) of the gun head (91); Step B3: moving the rivet nut gun (9) to place the hole plugger loaded on the gun head (91) into the hole to be plugged, with the distal end of the hole plugger facing the inside of the hole; Step B4: the threaded pull rod (92) is retracted 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 to have an interference fit with the inner wall of the channel, so that the locking portion (24) is at least partially squeezed and filled into the gap formed between the guide slope surface (912) and the expansion surface (15); Step B5: The threaded pull rod (92) is rotated and unscrewed from the threaded hole (22), thereby completing the sealing of the hole.

13. The pore blocking method according to claim 12, characterized in that: In step B3, the abutting end face (911) of the rivet nut gun (9) is made to abut against the end face where the hole opening is located.

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