A pore plugging device and a pore plugging method

Abstract

The present invention belongs to the technical field of occluding devices, and specifically relates to a channel occluder and a channel occluding method. The channel occluder includes a pull rod and an expansion ring sleeved on the pull rod; the pull rod includes a clamping section, an expansion section and a stop section arranged in sequence along the axial direction; the rod diameter at one end located on the clamping section and close to the expansion section is reduced, forming a breaking groove in the circumferential direction; the rod diameter of the expansion section is larger than the rod diameter of the clamping section, and the rod diameter at one end located on the expansion section and close to the clamping section gradually changes to form a guide slope; the rod diameter at one end located on the expansion section and close to the stop section increases to form a locking ring; the rod diameter of the stop section is larger than the rod diameter of the expansion section, and a stop end face is provided on one side located on the stop section and close to the expansion section, forming a concave locking groove between the stop end face and the locking ring; the inner diameter of the expansion ring is smaller than the rod diameter of the expansion section. The channel occluder of the present invention has many beneficial effects such as good sealing performance, good self-locking effect, strong corrosion resistance, easy installation, and compact structure.

Description

Technical Field

[0001] The present invention belongs to the technical field of occluding devices, and in particular relates to a duct occluding device and a duct occluding method. Background Art

[0002] Currently, to ensure fluid flow through water, oil, and gas lines, manufacturers drill process holes in the engine and transmission housings of gasoline-powered vehicles, as well as the motor and transmission housings of electric vehicles. This compensates for the structural limitations of die-casting and casting processes. Once the process holes are drilled, they need to be sealed to ensure the housing's tightness and pressure resistance.

[0003] The popular sealing components on the market at present mainly include bowl-shaped plugs, ball plugs, steel sealing plugs, aluminum sleeve steel core sealing plugs, etc. The above-mentioned sealing plugs are sealed by squeezing against the inner wall of the process hole. However, the reliability of this extrusion seal is low. It is easy to loosen due to factors such as mechanical vibration during long-term use, resulting in a decrease in pressure resistance or even leakage. In addition, the materials of the above-mentioned plugs are mainly alloy steel, carbon steel, or alloy steel combined with aluminum alloy. With the development of lightweight automobiles, automobile shells are gradually using die-cast aluminum alloys to replace traditional cast iron. When steel and aluminum alloy come into contact, the potential difference of the materials causes different degrees of potential corrosion at the contact position, resulting in leakage at the sealing plug position due to corrosion during the service of the shell, forcing the host manufacturer to take additional anti-corrosion measures for the sealing plug position after assembly. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides a duct plugging device and a duct plugging method.

[0005] The first aspect of the present invention is to provide a channel plugger, comprising a pull rod and an expansion ring sleeved on the pull rod; the pull rod comprises a clamping section, an expansion section and a stop section arranged in sequence along the axial direction; the rod diameter at one end located on the clamping section and close to the expansion section is reduced, forming a breaking groove in the circumferential direction; the rod diameter of the expansion section is larger than the rod diameter of the clamping section, and the rod diameter at one end located on the expansion section and close to the clamping section gradually changes to form a guide slope; the rod diameter at one end located on the expansion section and close to the stop section increases to form a locking ring; the rod diameter of the stop section is larger than the rod diameter of the expansion section The expansion ring has a diameter, a stop end face located on the stop section and close to the expansion section, and a concave locking groove is formed between the stop end face and the locking ring; the inner diameter of the expansion ring is smaller than the rod diameter of the expansion section. When the expansion ring is inserted into the expansion section under the guidance of the guide slope, the expansion section squeezes outward and expands the expansion ring; the expansion ring has an extrusion end face on one end close to the stop section and a resistance end face on the other end away from the stop section. When the expansion ring squeezes the stop section, the stop end face exerts pressure on the extrusion end face, forcing the material near the extrusion end face to deform and embed into the locking groove.

[0006] Furthermore, in the above-mentioned channel plugger, a plurality of circumferentially extending anti-slip grooves are provided on the surface of the clamping section, and the plurality of anti-slip grooves are arranged along the axial direction of the clamping section.

[0007] Furthermore, in the above-mentioned channel plugger, the surface of the locking ring intersects with the axial section of the expansion section to form a locking section curve, and the shape of the locking section curve includes: arc, parabola, angled shape and a combination of one or more thereof.

[0008] Furthermore, in the above-mentioned duct plugger, the surface of the guide slope transitions tangentially to the surface of the expansion section body.

[0009] Furthermore, in the above-mentioned channel plugger, the surface of the guide slope intersects with the axial cross section of the expansion section to form a guide line, and the guide line is formed by smoothly connecting an arc and a straight line.

[0010] Furthermore, in the above-mentioned channel plugger, the distance between the extrusion end surface and the stopping end surface increases as the diameter increases.

[0011] Furthermore, in the above-mentioned duct plugger, the pull rod and the expansion ring are each integrally formed from an aluminum alloy material.

[0012] Furthermore, in the above-mentioned duct plugger, the material strength of the pull rod is higher than the material strength of the expansion ring.

[0013] A second aspect of the present invention is to provide a duct sealing method, using the above-mentioned duct plugger, comprising the following steps:

[0014] Step 1: Place the end of the channel plugger close to the blocking section into the channel to be plugged;

[0015] Step 2: Press against the contact end face of the expansion ring and pull the pull rod outward from the hole to make the expansion ring fit over the expansion section. During this process, the expansion section squeezes outward and expands the expansion ring, so that the outer wall of the expansion ring is squeezed and fits tightly against the inner wall of the hole.

[0016] Step 3: Continue to pull the rod out of the hole so that the blocking end face presses the extrusion end face, forcing the material near the extrusion end face to deform and embed into the locking groove;

[0017] Step 4: Continue to pull the rod out of the channel. The rod cannot withstand the pulling force and breaks at the broken groove, completing the plugging.

[0018] Furthermore, the clamping section is inserted into the gun nozzle of the rivet gun and clamped, the abutting end face is pressed against the gun nozzle end face, and the rivet gun is started to pull the pull rod out of the channel.

[0019] Beneficial effects

[0020] Compared with the prior art, the duct plugging device and duct plugging method provided by the present invention have the following beneficial effects:

[0021] Good sealing performance: by pulling the pull rod to expand the expansion ring, the outer wall of the expansion ring is squeezed and fits tightly with the inner wall of the channel, which can effectively seal the channel, prevent leakage and loosening, and achieve good sealing effect.

[0022] Excellent self-locking effect: Pulling the pull rod causes the blocking end face to press the extrusion end face, forcing the material near the extrusion end face to deform and embed into the locking groove, increasing the extrusion force in the radial direction of the channel plugger, and also firmly locking the expansion ring and the expansion section together to prevent loosening.

[0023] Strong corrosion resistance: The channel plugger is made of aluminum alloy material. There is no potential corrosion between it and the aluminum alloy shell, and an oxide film is automatically formed on the surface of the aluminum alloy, which can protect the interior from corrosion and has good corrosion resistance.

[0024] Easy to install: With the help of a common tool, a rivet gun, you can easily pull the pull rod to achieve the sealing function, which is convenient for installation and operation.

[0025] Compact structure: The channel plugger has a compact structure and can achieve effective plugging in a limited space. It is suitable for various narrow channels. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 and Figure 2 Schematic diagram of the structure of the channel plugger.

[0027] Figure 3 for Figure 2 A partial enlarged view of area I.

[0028] Figure 4 for Figure 2 A partial enlarged view of the middle II area.

[0029] Figure 5 Schematic diagram of the initial state of the pore occluder.

[0030] Figure 6 This is a schematic diagram of the channel plugger completing the plugging state.

[0031] Figure 7 for Figure 6 A partial enlarged view of the middle III area.

[0032] Figure 8 A schematic diagram of a guide line formed by smoothly connecting an arc and a straight line.

[0033] Figure 9 Schematic diagram of the guide lines formed by the arc.

[0034] Figure 10 This is the simulation result corresponding to the guide line formed by the smooth connection of the arc and the straight line.

[0035] Figure 11 The simulation results for the guide lines formed by the arcs.

[0036] Figures 12 to 14 The simulation calculation results of the expansion process of the expansion ring corresponding to the guide line formed by the smooth connection of the arc and the straight line.

[0037] In the figure, 1, pull rod; 2, expansion ring; 11, clamping section; 12, expansion section; 13, stopping section; 111, breaking groove; 121, guide slope; 122, locking ring; 131, stopping end face; 123, locking groove; 21, extrusion end face; 22, resistance end face; 112, anti-slip groove. DETAILED DESCRIPTION

[0038] like Figure 1 The duct plugger shown mainly comprises a pull rod 1 and an expansion ring 2 sleeved on the pull rod 1. The expansion ring 2 is expanded by pulling the pull rod 1 to plug the duct.

[0039] The specific structure of the pull rod 1 is as follows Figure 2 As shown in FIG, it includes a clamping section 11, an expansion section 12 and a stop section 13 arranged in sequence along the axial direction; the rod diameter at one end located on the clamping section 11 and close to the expansion section 12 is reduced, forming a circumferential shape as shown in FIG. Figure 3 The rod diameter of the expansion section 12 is larger than the rod diameter of the clamping section 11, located on the expansion section 12 and close to the clamping section 11 of the end of the rod diameter gradually formed as shown in FIG. Figure 3 Located on the expansion section 12 and close to the end of the stop section 13 of the rod diameter increases to form as shown in the guide slope 121; Figure 4 The rod diameter of the stop section 13 is larger than the rod diameter of the expansion section 12, located on the stop section 13 and close to the expansion section 12 has a side such as Figure 4 The blocking end surface 131 shown in FIG. 1 forms a recessed locking groove 123 between the blocking end surface 131 and the locking ring 122 .

[0040] The specific structure of the expansion ring 2 is shown in Figure 2. It is in the shape of a circular tube as a whole. The inner diameter of the expansion ring 2 is smaller than the rod diameter of the expansion section 12. The end of the expansion ring 2 close to the stop section 13 has an extrusion end face 21, and the end away from the stop section 13 has a contact end face 22.

[0041] In the initial state of the duct plugger, the expansion ring 2 is typically positioned over the clamping section 11 and close to the expansion section 12. As the pull rod 1 is pulled, the expansion ring 2 is guided by the guide slope 121 and inserted into the expansion section 12. The expansion section 12 then squeezes and expands the expansion ring 2. As the pull rod 1 continues to be pulled, the expansion ring 2 squeezes the stop section 13. The stop end face 131 applies pressure to the extrusion end face 21, forcing the material near the extrusion end face 21 to deform and embed into the locking groove 123.

[0042] like Figure 2 As shown, the surface of the clamping section 11 is provided with a plurality of circumferentially extending anti-slip grooves 112, and the plurality of anti-slip grooves 112 are arranged along the axial direction of the clamping section 11, so that the pull rod 1 can be easily clamped, and by increasing the contact area of ​​the surface of the pull rod 1 and increasing the friction coefficient, the pull rod 1 can be effectively prevented from slipping when it is pulled.

[0043] See also Figure 4 The surface of the locking ring 122 intersects with the axial section of the expansion section 12 to form a locking cross-section curve. The shape of the locking cross-section curve can be various, preferably Figure 4 The arc shape shown is a circle, but it can also be other shapes, such as a parabola, a broken angle, etc. It can also be a combination of one or more of them, for example, continuous arcs can form a wave shape.

[0044] See also Figure 3 The surface of the guide slope 121 preferably transitions tangentially with the main surface of the expansion section 12. This prevents the inner wall of the expansion ring 2 from being strained when the clamping section 11 is attached, thereby affecting its airtightness. The surface of the guide slope 121 intersects with the axial cross-section of the expansion section 12 to form a guide line. The guide line can have various shapes, including a smooth connection between an arc and a straight line, or a circular arc curve, a logarithmic curve, or a Bezier curve. However, the preferred guide line shape is a smooth connection between an arc and a straight line.

[0045] like Figure 2 As shown, the distance between the extrusion end face 21 and the stop end face 131 increases with the increase of the diameter. In this way, when the expansion ring 2 extrude the stop segment 13, the stop end face 131 exerts pressure on the extrusion end face 21 concentrated on the inner side of the extrusion end face 21. The concentrated pressure on the inner side causes the nearby material to deform and firmly embed into the locking groove 123, which significantly improves the bite force between the two and effectively avoids loosening and leakage.

[0046] Preferably, the pull rod 1 and the expansion ring 2 are each integrally formed from an aluminum alloy material. With the development of lightweight automobiles, automobile shells are gradually adopting die-cast aluminum alloys to replace traditional cast iron. When steel and aluminum alloy come into contact, the potential difference between the materials causes varying degrees of potential corrosion at the contact position. By setting the pull rod 1 and the expansion ring 2 to aluminum alloy materials, there is no potential corrosion between the channel plug and the aluminum alloy shell, and the aluminum alloy will automatically form a layer of oxide film on the surface during service to protect the interior from corrosion, so the sealing plug has good corrosion resistance.

[0047] Furthermore, the material strength of the tie rod 1 is higher than that of the expansion ring 2. Preferably, the tie rod 1 and the expansion ring 2 are made of the same aluminum alloy. Different strengths can be obtained through different heat treatment processes for the same aluminum alloy.

[0048] Based on the above-mentioned duct plugging device, a duct plugging method is further introduced, which includes the following steps:

[0049] Step 1: The initial state of the pore blocker is as follows: Figure 5 As shown, the expansion ring 2 is sleeved on the clamping section 11 and close to the expansion section 12. In this state, the end of the channel plugger close to the stop section 13 is placed in the channel to be plugged;

[0050] Step 2: Press against the contact end face 22 of the expansion ring 2 and pull the pull rod 1 outward from the hole, so that the expansion ring 2 is sleeved on the expansion section 12. During this process, the expansion section 12 squeezes and expands the expansion ring 2 outward, so that the outer wall of the expansion ring 2 is squeezed and fits tightly against the inner wall of the hole, thereby closing the hole;

[0051] Step 3: Continue to pull the pull rod 1 out of the channel, so that the blocking end surface 131 presses the extrusion end surface 21, forcing the material near the extrusion end surface 21 to deform and embed into the locking groove 123. This not only further increases the extrusion force in the radial direction of the channel plugger, but also firmly locks the expansion ring 2 and the expansion section 12 together to prevent the two from loosening and leakage between the two.

[0052] Step 4: Continue to pull the rod 1 out of the channel. The rod 1 cannot withstand the tension and breaks at the breaking groove 111, forming Figure 6 When the blocking is completed, the locking state at the locking groove 123 is as shown. Figure 7 shown.

[0053] Preferably, the rod 1 can be easily pulled to achieve the sealing function with the help of a rivet gun. Specifically, the clamping section 11 is inserted into the nozzle of the rivet gun and clamped, the abutting end face 22 is pressed against the end face of the nozzle, and the rivet gun is started to pull the rod 1 out of the channel.

[0054] As described above, regarding the shape of the guide line, a guide line formed by smoothly connecting an arc and a straight line is preferably used. The present invention has studied the shapes of various guide lines, such as a guide line formed by smoothly connecting an arc and a straight line, a guide line formed by a circular arc curve, a guide line formed by a logarithmic curve, and a guide line formed by a Bezier curve. It was found that in the process of putting the expansion section 12 on the expansion ring 2, a guide line formed by smoothly connecting an arc and a straight line is more conducive to the expansion of the expansion ring 2, that is, the material of the expansion ring 2 tends to flow radially, while guide lines of other shapes will cause varying degrees of material accumulation, that is, the material of the expansion ring 2 accumulates on the guide line, which is not conducive to the uniform expansion of the expansion ring 2.

[0055] For example, Figure 8The figure shows a guide line formed by a smooth tangent connection between arc C and straight line D. In the figure, the horizontal distance A is 1.57 mm, the vertical distance B is 0.35 mm, arc C is tangent to the horizontal direction at the far left end, the radius of arc C is 3.0 mm, and the inclination angle α of straight line D is 15°; Figure 9 Shown is a guide line formed by arc E. In the figure, the horizontal distance A is 1.57 mm, the vertical distance B is 0.35 mm, and the arc E is tangent to the horizontal direction at the leftmost end.

[0056] Figure 10 and Figure 11 The simulation results corresponding to the above two guide lines are shown respectively, as shown in Figure 10 As shown, the guide line is formed by the smooth tangent connection of the arc C and the straight line D. When the expansion ring 2 is put on the expansion section 12, the material tends to flow radially, and there is no obvious material accumulation on the guide line, which makes the expansion ring 2 expand evenly and smoothly. Figure 11 As shown, a guide line formed by a single arc E is used. When the expansion ring 2 is put on the expansion section 12, the material not only flows radially, but also is obviously squeezed in the pulling direction of the pull rod 1, which is manifested as a large amount of material accumulation on the guide line, which is not conducive to the uniform and smooth expansion of the expansion ring 2.

[0057] also, Figure 8 The scheme of forming a guide line by smoothly connecting the arc C and the straight line D is illustrated. The present invention further simulates the scheme. Pulling the pull rod 1 causes the expansion ring 2 to be put on the expansion section 12. The process is as follows: Figure 12 、 Figure 13 and Figure 14 As shown by Figure 14 It can be seen that after the expansion ring 2 is put on the expansion section 12, the entire surface of the expansion section 12 is subjected to a larger and more uniform extrusion pressure, which is conducive to preventing leakage. In addition, the blocking end face 131 presses the extrusion end face 21, forcing the material near the extrusion end face 21 to deform and fully embed into the locking groove 123, so that the expansion ring 2 and the expansion section 12 are firmly locked together.

[0058] It should also be noted that although the above example specifically provides the dimensions of the guide line formed by the smooth tangent connection of arc C and straight line D, those skilled in the art will understand that the preferred guide line dimensions are not solely limited by this dimension. It has been verified that when the lateral distance A is within the range of 1.20-1.90 mm, the longitudinal distance B is within the range of 0.20-0.45 mm, the radius of arc C is within the range of 2.0-4.0 mm, and the inclination angle α of straight line D is within the range of 11-20°, an ideal locking effect close to the current dimensions can be achieved.

[0059] The above embodiments are exemplary and intended to illustrate the technical concepts and features of the present invention so that those skilled in the art can understand the present invention and implement it accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A duct plugging device, characterized in that: The invention comprises a pull rod (1) and an expansion ring (2) sleeved on the pull rod (1); the pull rod (1) comprises a clamping section (11), an expansion section (12) and a stop section (13) arranged in sequence along the axial direction; the rod diameter at one end located on the clamping section (11) and close to the expansion section (12) is reduced, and a breaking groove (111) is formed in the circumferential direction; the rod diameter of the expansion section (12) is larger than the rod diameter of the clamping section (11); the rod diameter at one end located on the expansion section (12) and close to the clamping section (11) is gradually changed to form a guide slope (121); the rod diameter at one end located on the expansion section (12) and close to the stop section (13) is increased to form a locking ring (122); the rod diameter of the stop section (13) is larger than the rod diameter of the expansion section (12); the rod diameter at one end located on the stop section (13) and close to the expansion section (1 2) has a stop end face (131) on one side, and a recessed locking groove (123) is formed between the stop end face (131) and the locking ring (122); the inner diameter of the expansion ring (2) is smaller than the rod diameter of the expansion section (12); when the expansion ring (2) is inserted into the expansion section (12) under the guidance of the guide slope (121), the expansion section (12) squeezes outward and expands the expansion ring (2); the end of the expansion ring (2) close to the stop section (13) has an extrusion end face (21), and the end away from the stop section (13) has a contact end face (22); when the expansion ring (2) squeezes the stop section (13), the stop end face (131) applies pressure to the extrusion end face (21), forcing the material near the extrusion end face (21) to deform and embed into the locking groove (123); The distance between the extrusion end surface (21) and the stop end surface (131) increases as the diameter increases.

2. The pore plugging device according to claim 1, characterized in that: The surface of the clamping section (11) is provided with a plurality of circumferentially extending anti-slip grooves (112), and the plurality of anti-slip grooves (112) are arranged along the axial direction of the clamping section (11).

3. The pore plugging device according to claim 1, characterized in that: The surface of the locking ring (122) intersects with the axial cross section of the expansion section (12) to form a locking cross-section curve, and the shape of the locking cross-section curve includes: an arc shape, a parabola, an angle shape, and a combination of one or more thereof.

4. The pore plugging device according to claim 1, characterized in that: The surface of the guide slope (121) transitions tangentially with the main body surface of the expansion section (12).

5. The pore plugging device according to claim 4, characterized in that: The surface of the guide slope (121) intersects with the axial cross section of the expansion section (12) to form a guide line, and the guide line is formed by smoothly connecting a circular arc and a straight line.

6. The pore plugging device according to any one of claims 1 to 5, characterized in that: The pull rod (1) and the expansion ring (2) are each integrally formed from an aluminum alloy material.

7. The pore plugging device according to claim 6, characterized in that: The material strength of the pull rod (1) is higher than the material strength of the expansion ring (2).

8. A duct plugging method, characterized in that: The pore occluder according to any one of claims 1 to 7 comprises the following steps: Step 1: placing the end of the channel plugger close to the blocking section (13) into the channel to be plugged; Step 2: pressing against the contact end face (22) of the expansion ring (2), pulling the pull rod (1) outward from the hole, so that the expansion ring (2) is sleeved on the expansion section (12), and during the process, the expansion section (12) presses outward and expands the expansion ring (2), so that the outer wall of the expansion ring (2) is squeezed and tightly fitted with the inner wall of the hole; Step 3: Continue to pull the pull rod (1) out of the channel, so that the blocking end surface (131) presses the extrusion end surface (21), forcing the material near the extrusion end surface (21) to deform and embed into the locking groove (123); Step 4: Continue to pull the pull rod (1) out of the channel. The pull rod (1) cannot withstand the pulling force and breaks at the breaking groove (111), completing the plugging.

9. The duct plugging method according to claim 8, characterized in that: The clamping section (11) is inserted into the gun nozzle of the rivet gun and clamped, the abutting end surface (22) is pressed against the gun nozzle end surface, and the rivet gun is started to pull the pull rod (1) out of the hole.

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