A screw for sealing a bore

Abstract

The utility model discloses a high temperature sealing screw, including screw body and screw head insert, the screw body is made of steel material, has the outer thread, is equipped with the internal hexagonal drive structure in the bottom, the screw head insert is made of copper material, inlays the head of screw body, and is connected through welding or other reliable mode fixedly, the surface of screw head insert and the contact of plugging target hole is designed as conic or arc, wherein, the outer thread diameter of screw body is 3mm 20mm, and the pitch is 0.5mm 2.5mm, the conic or arc surface of screw head insert is 5 45 degrees of conical angle or arc radius. The utility model discloses can realize reliable hole sealing under high temperature environment, and convenient to install.

Description

Technical Field

[0001] This utility model relates to the field of sealing device technology, specifically a screw for hole sealing. Background Technology

[0002] In many industrial applications, such as engines, boilers, and chemical equipment, it is often necessary to seal holes in high-temperature environments. Existing sealing screws or plugs mostly use rubber or plastic as sealants, which are prone to aging, deformation, or even melting at high temperatures, leading to seal failure. Traditional metal sealing methods, such as using gaskets, often require significant preload, and their sealing effect is greatly affected by machining accuracy and surface finish. Therefore, there is a need for a hole sealing screw that can reliably seal in high-temperature environments and is easy to install.

[0003] Therefore, this application provides a hole sealing screw with a steel-based copper-inlaid structure to solve the problems existing in the above-mentioned background art. Utility Model Content

[0004] Purpose of the utility model: To overcome the shortcomings of the prior art and provide a high-temperature sealing screw. The screw adopts a steel-based copper-inlaid structure, which can achieve reliable hole sealing in high-temperature environments and is easy to install.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A screw for hole sealing includes a screw body and a screw head insert. The screw body is made of steel, has external threads, and an internal hexagonal drive structure at the bottom. The screw head insert is made of copper, is embedded in the head of the screw body, and is fixedly connected by welding or other reliable means. The surface of the screw head insert that contacts the target hole being sealed is designed to be tapered or arc-shaped. The external thread diameter of the screw body is 3mm-20mm, and the pitch is 0.5mm-2.5mm. The cone angle or radius of curvature of the tapered or arc-shaped surface of the screw head insert is 5°-45°.

[0007] Furthermore, an annular groove is provided at the connection between the screw head insert and the screw body to accommodate welding material.

[0008] Furthermore, the threaded portion of the screw body is coated with a high-temperature resistant lubricant.

[0009] Furthermore, the conical or arc-shaped surface of the screw head insert is surface-treated.

[0010] Furthermore, a thin layer of high-temperature resistant sealant is provided between the head of the screw body and the screw head insert.

[0011] Furthermore, the screw body has a self-locking thread design.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] By employing a steel-based, copper-inlaid structure, the copper material possesses excellent ductility and high-temperature resistance, enabling reliable sealing in high-temperature environments. The internal hexagonal drive structure facilitates quick and easy installation. It can be used in various applications requiring orifice sealing in high-temperature environments. The use of common steel and copper materials results in lower costs. The metal materials are resistant to aging and deformation, ensuring a long service life. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] In the diagram: 1. Screw body; 2. Screw head insert; 3. Target hole plug. Detailed Implementation

[0016] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0017] Applicant's design Figure 1The screw shown is for hole sealing, comprising a screw body 1 and a screw head insert 2. The screw body 1 is made of steel, has external threads, and an internal hexagonal drive structure at the bottom. The steel selection should consider high-temperature strength and oxidation resistance; 304 stainless steel or higher-grade heat-resistant steel can be used. The screw head insert 2 is made of copper, embedded in the head of the screw body 1, and fixedly connected by welding or other reliable methods. The copper selection should consider its ductility and thermal conductivity; for example, copper or brass can be used. The surface of the screw head insert 2 that contacts the target hole 3 is designed to be conical or arc-shaped to induce plastic deformation during tightening, tightly fitting the opening of the target hole 3 to achieve a seal. The external thread diameter of the screw body 1 is 3mm-20mm, and the pitch is 0.5mm-2.5mm. The cone angle or radius of curvature of the conical or arc-shaped surface of the screw head insert 2 is 5°-45°. The selection of the thread diameter and pitch should be determined according to the size of the target hole 3 and the stress conditions. Smaller thread diameters are suitable for smaller holes, while larger thread diameters are suitable for larger holes. Smaller thread pitch provides greater locking force but slower tightening speed; larger thread pitch increases tightening speed but reduces locking force. The choice of taper angle or radius of curvature should be determined based on the shape and material properties of the target hole. Smaller taper angles or radii of curvature provide a larger contact area but less deformation; larger taper angles or radii of curvature provide greater deformation but less contact area.

[0018] In this embodiment, the screw used for hole sealing may optionally have an annular groove at the connection between the screw head insert 2 and the screw body 1 to accommodate welding material, thereby improving welding strength and sealing performance. The depth and width of the annular groove should be optimized according to the welding process and material properties.

[0019] Optionally, the screw used for hole sealing in this embodiment may have its threaded portion coated with a high-temperature resistant lubricant.

[0020] Optionally, the conical or arc-shaped surface of the screw head insert 2 in this embodiment for hole sealing may be surface-treated, for example with a molybdenum disulfide-based lubricant, to reduce friction during tightening, improve installation efficiency, and prevent thread seizing.

[0021] In this embodiment, the screw used for hole sealing may, optionally, have a thin layer of high-temperature resistant sealant, such as silicone sealant or polytetrafluoroethylene sealant, between the head of the screw body 1 and the screw head insert 2, to further improve sealing reliability, especially when there are minor defects on the surface of the target hole 3.

[0022] In this embodiment, the screw used for hole sealing may further be optionally designed with a self-locking thread on the screw body 1 to prevent the screw from loosening under high temperature and vibration conditions and to improve safety in use; the conical or arc-shaped surface of the screw head insert 2 may be surface treated, such as sandblasting or polishing, to improve surface smoothness and enhance the fit with the opening of the target hole 3, thereby enhancing the sealing effect.

[0023] In use, align the screw with the target hole 3 and tighten the screw body 1 using an Allen wrench. As the screw body 1 is tightened, the screw head insert 2 gradually presses against the opening of the target hole 3. Due to the good ductility of copper, the screw head insert 2 undergoes plastic deformation under pressure, completely fitting against the opening of the target hole 3, thus achieving a reliable seal. At high temperatures, the ductility of copper further increases, ensuring a consistent sealing effect.

[0024] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A screw for hole sealing, comprising a screw body and a screw head insert, characterized in that: The screw body is made of steel and has external threads, with an internal hexagonal drive structure at the bottom. The screw head insert is made of copper and is embedded in the head of the screw body, and is fixedly connected by welding or other reliable methods. The surface of the screw head insert that contacts the target hole being sealed is designed to be tapered or arc-shaped. The external thread diameter of the screw body is 3mm-20mm, and the pitch is 0.5mm-2.5mm. The cone angle or radius of curvature of the tapered or arc-shaped surface of the screw head insert is 5°-45°.

2. A screw for hole sealing according to claim 1, characterized in that, An annular groove is provided at the connection between the screw head insert and the screw body to accommodate welding material.

3. A screw for hole sealing according to claim 1, characterized in that, The threaded portion of the screw body is coated with a high-temperature resistant lubricant.

4. A screw for hole sealing according to claim 1, characterized in that, The conical or arc-shaped surface of the screw head insert is surface treated.

5. A screw for hole sealing according to claim 1, characterized in that, A thin layer of high-temperature resistant sealant is provided between the head of the screw body and the screw head insert.

6. A screw for hole sealing according to claim 1, characterized in that, The screw body has a self-locking thread design.

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