Expansion type sealing plug

Abstract

The utility model discloses an expansion type sealing plug, which is used for being mounted in a hole to be sealed so as to plug and seal the hole, and comprises a core, a first sealing ring, a second sealing ring and a sealing ring, the core is provided with a threaded hole and a smooth first conical outer wall, and the head of the core is provided with at least one annular groove; the inner wall of a through hole of the expansion sleeve is provided with an inner step protruding inwards. The material of the core is harder than that of the expansion sleeve, when the core retracts into the expansion sleeve, the first conical outer wall forces the expansion sleeve to deform and expand outwards in the radial direction, and the inner step plastically deforms inwards in the radial direction to form a deformation part entering the annular groove. The utility model provides an expansion type sealing plug which is characterized in that an inner step is arranged in a through hole of an expansion sleeve, and at least one annular groove is formed in the head of a core. And the inner step is plastically deformed under stress to form a deformation part inserted into the annular groove, so that axial locking of the core and the expansion sleeve is realized, a gap between the core and the expansion sleeve is reduced, and the sealing performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing accessories, and more specifically to an expansion type sealing plug, which is used for sealing a hole waiting to be sealed with any medium whose maximum pressure does not exceed 500 bar. Background Art

[0002] For example, CN204140863U discloses a pumping sealing plug, which uses a rivet system with a rod designed to break when the plug is installed in the hole. The rod of this design is similar to the popular rivet, but manufacturing the pull rod can be a complicated and expensive process. Because the pull rod must break under appropriate force to properly install the plug.

[0003] In order to omit the tie rod that needs to be broken for each installation, there is also a simplified solution, such as US06230378, which discloses a plug assembly, which includes a generally cylindrical expansion sleeve, which has a socket portion, and the socket portion receives a wedge nut with a diameter smaller than the sleeve. The screw element is received by the nut thread and passes through the gap opening in the sleeve. The threaded element is provided with a head, which engages the sleeve on the side axially opposite to the socket portion, thereby screwing the threaded element into the nut, thereby pulling the latter deeper into the socket portion. The outer periphery of the sleeve is preformed to be out of roundness by a predetermined degree to provide an interference fit with the hole of cylindrical cross section to be blocked.

[0004] Or in US16182117, an insert for connecting a first part and a second part is disclosed, each part having a hole, the insert having a cylindrical sleeve and a core. The cylindrical sleeve has a central void and an outer diameter, the size of the outer diameter is suitable for fitting into the hole in the first part. The central void has a uniform diameter over the length of the cylindrical sleeve. The core has a through hole and a tapered outer wall so that when the core is pulled into the cylindrical sleeve, the cylindrical sleeve expands against the hole of the first part to fix the insert to the first part. The through hole of the core has a threaded portion at the first end of the core to engage with a threaded fastener to fix the second part to the first part. The first end of the core is press-fit into the cylindrical sleeve.

[0005] In the above three patent solutions, once the sealing plug completes the sealing, if the core is axially reversely pressed, this may cause the core to come out of the sleeve. In order to further enhance the bonding force between the core and the sleeve, this application is hereby proposed. Summary of the invention

[0006] The utility model aims to solve one of the technical problems in the related art to a certain extent. To this end, the utility model proposes an expansion type sealing plug.

[0007] The technical solution adopted by the utility model is: to provide an expansion type sealing plug, which is used to be installed in a hole to be sealed, so as to plug and seal the hole, and the sealing plug comprises:

[0008] A core having a threaded hole and a smooth first tapered outer wall, wherein the head of the core has at least one annular groove;

[0009] The expansion sleeve has an inner wall of a through hole thereof having an inner step protruding inwardly;

[0010] The material of the core is harder than that of the expansion sleeve. When the core is retracted into the expansion sleeve, the first conical outer wall forces the expansion sleeve to deform and expand radially outward, and the inner step plastically deforms radially inward to form a deformation portion that enters the annular groove.

[0011] Compared with the prior art, the utility model provides an inner step in the through hole of the expansion sleeve and provides at least one annular groove on the head of the core. The inner step is plastically deformed by force to form a deformed portion inserted into the annular groove, thereby realizing axial self-locking of the core and the expansion sleeve, reducing the gap between the core and the expansion sleeve, and improving the sealing performance to prevent leakage.

[0012] According to an embodiment of the utility model, the through hole has a second inner diameter at one end close to the core, and the head has a first outer diameter, and the first outer diameter is smaller than the second inner diameter.

[0013] According to one embodiment of the utility model, the portion between the first conical outer wall and the head has a second outer diameter, and the second outer diameter is less than or equal to the second inner diameter; the above-mentioned arrangement enables the head of the core to fit tightly with the expansion sleeve, and the core can be left on the expansion sleeve before being engaged with the expansion sleeve, and the two do not need to be packaged separately, thereby improving convenience of use.

[0014] According to one embodiment of the utility model, the end of the through hole away from the core has a first inner diameter, the head has a first outer diameter, and the first inner diameter is less than or equal to the first outer diameter; when the core is retracted into the expansion sleeve, the core head is tightly matched with the first inner diameter portion of the through hole.

[0015] According to an embodiment of the present utility model, the through hole is a stepped hole, which includes a first inner hole and a second inner hole.

[0016] According to an embodiment of the present invention, the step surface between the first inner hole and the second inner hole has an arc-shaped transition portion.

[0017] According to an embodiment of the utility model, the portion between the first conical outer wall and the head has a first guide portion.

[0018] According to an embodiment of the utility model, the head has a second guide portion, and the second guide portion is used to guide the head to be inserted into the second inner hole; when the second guide portion contacts the arc-shaped transition portion, it guides it to form a deformation portion.

[0019] According to an embodiment of the utility model, a second tapered outer wall is provided at the tail of the core, and the minimum outer diameter of the second tapered outer wall is greater than or equal to the maximum outer diameter of the first tapered outer wall.

[0020] According to an embodiment of the present utility model, the depth of the threaded hole is smaller than the axial height of the core. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A three-dimensional diagram of a sealing plug in an embodiment of the utility model;

[0023] Figure 2 A half-section view of a sealing plug in an embodiment of the utility model;

[0024] Figure 3 A half-section stereoscopic view of a sealing plug in an embodiment of the utility model;

[0025] Figure 4 It is a partial enlarged view of the sealing plug in the embodiment of the utility model, wherein the red dotted line is the contour structure of the deformation part before deformation;

[0026] Figure 5 A half-section perspective view of an insert in an embodiment of the utility model;

[0027] Figure 6 A three-dimensional diagram of an insert in an embodiment of the utility model;

[0028] Figure 7 A cross-sectional view of an expansion sleeve in an embodiment of the utility model;

[0029] Figure 8 A half-section stereoscopic view of a sealing plug installed at a position to be sealed in an embodiment of the utility model;

[0030] Fig. 9 A cross-sectional view of an insert in an embodiment of the utility model;

[0031] Fig.10It is a half-section view of the expansion sleeve in the embodiment of the utility model.

[0032] Description of the numbers in the figure:

[0033] 1. Core; 2. Expansion sleeve; 3. Hole to be sealed;

[0034] 11. threaded hole; 12. annular groove; 13. first tapered outer wall; 14. head; 15. second tapered outer wall;

[0035] 12a, a first guide portion;

[0036] 14a, a second guide portion;

[0037] 21. first inner hole; 22. second inner hole; 23. arc-shaped transition portion; 24. deformation portion;

[0038] h1, first inner diameter; h2, second inner diameter; h3, first outer diameter; h4, second outer diameter; h5, third outer diameter. DETAILED DESCRIPTION

[0039] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0040] Example 1 Figure 1-10 As shown, in this embodiment, an expansion type sealing plug is disclosed, which is used to be installed in a hole 3 to be sealed, so as to plug and seal the hole, and the sealing plug includes:

[0041] A core 1 having a threaded hole 11 and a smooth first tapered outer wall 13, wherein a head 14 of the core 1 has at least one annular groove 12;

[0042] The expansion sleeve 2 has an inner wall of a through hole having an inner step protruding inwardly;

[0043] Among them, the material of the core 1 is harder than the material of the expansion sleeve 2. When the core 1 is retracted into the expansion sleeve 2, the first conical outer wall 13 forces the expansion sleeve 2 to deform and expand radially outward for the first time, and the inner step plastically deforms radially inward to form a deformation portion 24 that enters into the annular groove 12.

[0044] Furthermore, in this embodiment, the core 1 and the expansion sleeve 2 are made of the same or different metal alloys, such as aluminum alloy, copper alloy, iron alloy, etc. In this embodiment, the core 1 and the expansion sleeve 2 are specifically made of aluminum alloy, more specifically, the core 1 is made of 7075 aluminum alloy, Vickers hardness ≥ 160HV; the expansion sleeve 2 is made of 6061 aluminum alloy, Vickers hardness ≤ 60HV. The depth of the threaded hole 11 is less than the axial height of the core 1. In other embodiments, the core 1 and the expansion sleeve 2 are both made of copper alloy. In another embodiment, the core 1 is made of copper alloy and the expansion sleeve 2 is made of aluminum alloy.

[0045] Combination Figure 5-6 As shown, the core 1 is provided with a threaded hole 11 inside, and the outer periphery includes a head 14, a first cylindrical section, a first tapered outer wall 13, a second cylindrical section and a second tapered outer wall 15 in the axial direction. The outer diameter of the first cylindrical section is the second outer diameter h4, the outer diameter of the second cylindrical section is the third outer diameter h5, and the second outer diameter h4 is smaller than the third outer diameter h5. An annular groove 12 is provided at the junction of the head 14 and the first cylindrical section, and a second guide portion 14a is provided at the outer edge of the end of the head 14.

[0046] Specifically, combined Figure 7-10 As shown, the through hole is a stepped hole, which includes a first inner hole 21 and a second inner hole 22, and the inner step is located between the first inner hole 21 and the second inner hole 22. The step surface between the first inner hole 21 and the second inner hole 22 has an arc-shaped transition portion 23, that is, the annular step surface is a curved surface with an R angle, and the above arrangement can guide the step surface to form a deformation portion 24.

[0047] Furthermore, the end of the through hole close to the core 1 has a second inner diameter h2, that is, the inner diameter of the first inner hole 21 is the second inner diameter h2; the head 14 has a first outer diameter h3, and the first outer diameter h3 is smaller than the second inner diameter h2. The minimum outer diameter in the annular groove 12 is smaller than the first outer diameter h3, and the portion between the first conical outer wall 13 and the head 14 has a second outer diameter h4, and the second outer diameter h4 is smaller than or equal to the second inner diameter h2.

[0048] Furthermore, the end of the through hole away from the core 1 has a first inner diameter h1, that is, the inner diameter of the second inner hole 22 is the first inner diameter h1, and the head 14 has a first outer diameter h3, which is less than or equal to the first outer diameter h3.

[0049] Specifically, the portion between the first tapered outer wall 13 and the head 14 has a first guide portion 12a. That is, the edge of the first cylindrical segment is provided with a first guide portion 12a, and the first guide portion 12a is used to guide the first cylindrical segment to be inserted into the first inner hole 21. The head 14 has a second guide portion 14a, and the second guide portion 14a is used to guide the head 14 to be incorporated into the second inner hole 22. The tail of the core 1 is provided with a second tapered outer wall 15, and the minimum outer diameter of the second tapered outer wall 15 is greater than or equal to the maximum outer diameter of the first tapered outer wall 13. When the core 1 is retracted into the expansion sleeve 2, the second tapered outer wall 15 forces the expansion sleeve 2 to deform and expand radially outward for the second time.

[0050] Furthermore, the expansion sealing plug in this embodiment is used as follows:

[0051] First, the sealing plug is inserted into the hole 3 to be sealed, and the head of the rivet gun is threadedly matched with the internal thread of the core 1. The rivet gun is used to pull the core 1 to move axially relative to the expansion sleeve 2, so that the core 1 is retracted into the expansion sleeve 2. The expansion sleeve 2 is forced to expand radially outward and press against the inner wall of the hole 3 to be sealed.

[0052] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0053] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0054] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0055] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An expansion sealing plug, which is used to be installed in a hole to be sealed, so as to plug and seal the hole, characterized in that: The sealing plug comprises: A core having a threaded hole and a smooth first tapered outer wall, wherein the head of the core has at least one annular groove; The expansion sleeve has an inner wall of a through hole thereof having an inner step protruding inwardly; The material of the core is harder than that of the expansion sleeve. When the core is retracted into the expansion sleeve, the first conical outer wall forces the expansion sleeve to deform and expand radially outward, and the inner step plastically deforms radially inward to form a deformation portion that enters the annular groove.

2. The expansion type sealing plug according to claim 1, characterized in that: The through hole has a second inner diameter at one end close to the core, and the head has a first outer diameter, which is smaller than the second inner diameter.

3. The expansion sealing plug according to claim 2, characterized in that: A portion between the first tapered outer wall and the head has a second outer diameter, and the second outer diameter is smaller than or equal to the second inner diameter.

4. The expansion sealing plug according to claim 1, characterized in that: An end of the through hole away from the core has a first inner diameter, and the head has a first outer diameter, and the first inner diameter is smaller than or equal to the first outer diameter.

5. The expansion type sealing plug according to claim 1, characterized in that: The through hole is a stepped hole, which includes a first inner hole and a second inner hole.

6. The expansion type sealing plug according to claim 5, characterized in that: The step surface between the first inner hole and the second inner hole has an arc-shaped transition portion.

7. The expansion sealing plug according to claim 1, characterized in that: A portion between the first tapered outer wall and the head has a first guide portion.

8. The expansion sealing plug according to claim 5, characterized in that: The head has a second guide portion, and the second guide portion is used to guide the head to be inserted into the second inner hole.

9. The expansion sealing plug according to claim 1, characterized in that: A second tapered outer wall is disposed at the tail of the core, and a minimum outer diameter of the second tapered outer wall is greater than or equal to a maximum outer diameter of the first tapered outer wall.

10. The expansion type sealing plug according to claim 1, characterized in that: The depth of the threaded hole is smaller than the axial height of the core.

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