Air pipe fixing self-tapping screw tip protection cap and air pipe connecting structure

Abstract

The utility model provides an air pipe fixing self-tapping screw tip protective cap and an air pipe connecting structure, the protective cap is used for being installed at the self-tapping screw tip for protection, and the protective cap comprises a nut, a cap body and a sealing ring; the nut and the cover body are integrally connected, one end of the nut is sealed by the cover body, the other end of the nut is an open end with an internal thread, and the internal thread is used for being in threaded connection with an external thread of a self-tapping screw; a sealing groove is formed in the opening end face of the nut, the sealing ring is embedded in the sealing groove, and the sealing ring protrudes out of the opening end face of the nut so as to extrude the sealing ring to achieve sealing of the opening end of the nut when the nut is connected to the tip end of the self-tapping screw in a threaded mode. The protective cap for the tip of the air pipe fixing self-tapping screw has the advantages of being firm in structure, good in sealing performance, convenient to install, long in service life and good in safety.

Description

Protective caps on the tips of self-tapping screws for duct fixing and duct connection structure Technical Field

[0001] This utility model relates to the field of duct fittings technology, specifically to a protective cap for the tip of a self-tapping screw for fixing ducts and a duct connection structure. Background Technology

[0002] In the fabrication and installation of air ducts, self-tapping screws are commonly used to connect and fix components. As shown in Figure 1, in the air duct connection structure, after the self-tapping screw 10 is screwed in, its tip is exposed inside the air duct. When the air duct is used to transport media such as air, on the one hand, the exposed screw tip is prone to rusting and loosening, and the gap between the screw and the air duct causes airflow leakage, affecting the insulation effect and the service life of the air duct; on the other hand, under the action of airflow, the sharp screw tip poses a safety hazard of cutting hands. Therefore, it is necessary to protect the tips of the self-tapping screws inside the air duct. Summary of the Invention

[0003] In view of the above, this utility model provides a protective cap for the tip of a self-tapping screw for fixing ducts, which has the advantages of sturdy structure, good sealing performance, convenient installation, long service life and good safety.

[0004] The technical solution of this utility model:

[0005] This utility model provides a protective cap for the tip of a self-tapping screw used for fixing a duct, which is installed on the tip of the self-tapping screw for protection. The protective cap includes a nut, a cover body, and a sealing ring. The nut and the cover body are integrally connected. The cover body closes one end of the nut, and the other end of the nut is an open end with an internal thread for screwing into the external thread of the self-tapping screw. A sealing groove is formed on the open end face of the nut, and the sealing ring is embedded in the sealing groove and protrudes from the open end face of the nut so as to seal the open end of the nut by squeezing the sealing ring when the nut is screwed onto the tip of the self-tapping screw.

[0006] According to one embodiment of the present invention, the nut and the cover are integrally formed from metal.

[0007] According to one embodiment of the present invention, the metal material is stainless steel or aluminum alloy.

[0008] According to one embodiment of the present invention, the sealing ring is made of EPDM rubber or silicone rubber with a Shore hardness of 60-80A.

[0009] According to one embodiment of the present invention, the internal thread has a triangular thread profile, the thread specification is compatible with the external thread of the self-tapping screw, the thread accuracy is 6H / 6g grade, and the effective engagement length of the internal thread is not less than 1.5 times the outer diameter of the self-tapping screw.

[0010] According to one embodiment of the present invention, the sealing groove is a rectangular cross-section groove.

[0011] According to one embodiment of the present invention, the height of the sealing ring protruding from the opening end face of the nut is 1 to 3 mm.

[0012] According to one embodiment of the present invention, the cover is a hemispherical or frustum-shaped structure.

[0013] According to one embodiment of the present invention, the protective cap is divided into multiple models according to the specifications of the self-tapping screw, and the tolerance match between the internal thread diameter of each model and the external thread diameter of the corresponding self-tapping screw is H7 / g6.

[0014] This utility model also provides a duct connection structure, including a duct body, a self-tapping screw, and a protective cap as described above; the self-tapping screw passes through the connection part of the duct body, and the screw tip protrudes from the inner wall of the duct body; the protective cap is screwed to the external thread of the self-tapping screw through the internal thread, and the sealing ring is squeezed between the nut opening end face and the inner wall of the duct body to form a sealing structure.

[0015] This utility model provides a protective cap for the tip of a self-tapping screw used for fixing ductwork. Through the cooperation of a nut, a cap body, and a sealing ring, it offers the following beneficial effects:

[0016] I. Structural Stability and Connection Reliability: The nut and cover are integrally connected, forming a stable overall structure, eliminating the risk of loosening or separation at the source. Even under long-term airflow impact and vibration conditions in the ductwork, the protective cap maintains its integrity, ensuring continuous protection of the self-tapping screw tips and significantly extending the service life of itself and related duct components. Simultaneously, the internal thread of the nut precisely matches the external thread of the self-tapping screw, achieving a tight connection through thread engagement. This resists external disturbances during installation and use, ensuring the protective cap stably fits the tip, providing reliable and long-lasting protection.

[0017] II. Innovative Upgrade in Sealing Performance: A sealing groove is provided on the open end face of the nut, and the sealing ring is embedded in the groove and protrudes from the end face. When the nut is screwed to the tip of the self-tapping screw, the sealing ring is compressed and deformed, actively filling the gap between the nut and the inner surface of the duct. Compared with a no-seal design, this structure significantly improves the sealing effect, effectively preventing airflow and dust from entering the protected space from the open end of the nut, avoiding the degradation of duct performance caused by dust accumulation and airflow leakage. Even under scenarios of temperature changes and airflow pressure fluctuations, the sealing ring can still stably maintain the seal due to its elasticity and the limiting position of the sealing groove, reducing the maintenance needs caused by seal failure.

[0018] III. Comprehensive Protection: The cover seals one end of the nut, which, together with the nut, covers the tip of the self-tapping screw, creating a fully enclosed protective space. This completely covers the sharp parts of the screw, improving the safety of the installation process and ensuring the overall quality and lifespan of the duct system.

[0019] IV. Highly Efficient and Convenient Installation and Maintenance: Utilizing the threaded connection and self-sealing characteristics of the sealing ring, installation only requires screwing the protective cap onto the tip of the self-tapping screw via the internal thread. No complex tools or processes are needed, making operation simple for construction personnel. This shortens the time required for post-duct protection treatment and improves overall construction efficiency. In daily use, due to its stable structure and reliable sealing, the probability of failure is low.

[0020] V. Significantly Enhanced Overall Benefits: On the production side, the integrated molding structure simplifies the manufacturing process and facilitates cost control; on the user side, it reduces maintenance and replacement costs due to screw tip issues, as well as system energy efficiency losses (such as wasted fan power) caused by poor sealing and dust accumulation. In the long term, it can provide effective support for the entire life cycle cost of the duct system. Simultaneously, for duct manufacturing and installation companies, this protective cap can enhance product quality and differentiation, strengthen bidding competitiveness, and help expand business in multiple scenarios such as civil, industrial, and cleanroom applications, creating market value.

[0021] The preferred embodiments of this utility model and their beneficial effects will be further described in detail in conjunction with specific implementation methods. Attached Figure Description

[0022] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but should not be construed as limiting the present invention. In the drawings:

[0023] Figure 1 is an assembly diagram of the existing duct connection structure;

[0024] Figure 2 is a perspective view of the protective cap at the tip of the self-tapping screw for fixing the air duct of this utility model;

[0025] Figure 3 is an exploded view of the protective cap at the tip of the self-tapping screw for fixing the air duct of this utility model;

[0026] Figure 4 is a cross-sectional view of the protective cap at the tip of the self-tapping screw for fixing the air duct of this utility model;

[0027] Figure 5 is an assembly diagram of the duct connection structure of this utility model.

[0028] The following are the reference numerals: 10 for self-tapping screws, 1 for nuts, 2 for caps, 3 for sealing rings, 4 for internal threads, 5 for sealing grooves, and 20 for the duct body. Detailed Implementation

[0029] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0030] Please refer to Figures 2 to 4. This utility model provides a protective cap for the tip of a self-tapping screw used to fix a duct, for installation on the tip of a self-tapping screw 10 for protection. The protective cap includes a nut 1, a cover body 2, and a sealing ring 3. The nut 1 and the cover body 2 are integrally connected. The cover body 2 closes one end of the nut 1, and the other end of the nut 1 is an open end with an internal thread 4, which is used to screw into the external thread of the self-tapping screw 10. A sealing groove 5 is formed on the open end face of the nut 1, and the sealing ring 3 is embedded in the sealing groove 5. The sealing ring 3 protrudes from the open end face of the nut 1 so that when the nut 1 is screwed onto the tip of the self-tapping screw 10, the sealing ring 3 is squeezed to achieve a seal at the open end of the nut 1.

[0031] This utility model relates to a protective cap for the tip of a self-tapping screw used for fixing ductwork. Through the cooperation of a nut 1, a cap 2, and a sealing ring 3, it offers the following beneficial effects:

[0032] I. Structural Stability and Connection Reliability: Nut 1 and cover 2 are integrally connected, forming a stable overall structure, eliminating the risk of loosening and separation at the source. Under conditions of long-term airflow impact and vibration in the duct, the protective cap can maintain its integrity, ensuring continuous protection of the tip of the self-tapping screw 10 and significantly extending the service life of itself and related duct components. Simultaneously, the internal thread 4 of nut 1 precisely matches the external thread of the self-tapping screw 10, achieving a tight connection through thread engagement, resisting external disturbances during installation and use, ensuring the protective cap stably fits the tip, and providing reliable and durable protection.

[0033] II. Innovative Upgrade of Sealing Performance: A sealing groove 5 is provided on the open end face of nut 1, and the sealing ring 3 is embedded in the groove and protrudes from the end face. When nut 1 is screwed to the tip of self-tapping screw 10, the sealing ring 3 is compressed and deformed, actively filling the gap between the nut and the inner surface of the duct. Compared with the unsealed design, this structure significantly improves the sealing effect, effectively preventing airflow and dust from entering the protected space from the open end of the nut, avoiding the deterioration of duct performance due to dust accumulation and airflow leakage. Even under scenarios of temperature changes and airflow pressure fluctuations, the sealing ring 3 can still stably maintain the seal by relying on its elasticity and the limiting position of the sealing groove 5, reducing the maintenance needs caused by seal failure.

[0034] III. Comprehensive protection: The cover 2 encloses one end of the nut 1, and together with the nut, it covers the tip of the self-tapping screw 10, creating a fully enclosed protective space. This completely covers the sharp parts of the screw, improving the safety of the installation process and ensuring the overall quality and lifespan of the duct system.

[0035] IV. Highly Efficient and Convenient Installation and Maintenance: Utilizing the threaded connection and self-sealing characteristics of the sealing ring, installation only requires screwing the protective cap onto the tip of the self-tapping screw 10 via the internal thread 4. No complex tools or processes are needed, making operation simple for construction personnel. This can shorten the time required for post-duct protection treatment and improve overall construction efficiency. In daily use, due to its stable structure and reliable sealing, the probability of failure is low.

[0036] V. Significantly Enhanced Overall Benefits: On the production side, the integrated molding structure simplifies the manufacturing process and facilitates cost control; on the user side, it reduces maintenance and replacement costs due to screw tip issues, as well as system energy efficiency losses (such as wasted fan power) caused by poor sealing and dust accumulation. In the long term, it can provide effective support for the entire life cycle cost of the duct system. Simultaneously, for duct manufacturing and installation companies, this protective cap can enhance product quality and differentiation, strengthen bidding competitiveness, and help expand business in multiple scenarios such as civil, industrial, and cleanroom applications, creating market value.

[0037] In this embodiment, the nut 1 and the cover 2 are integrally formed from a metal material, which can be stainless steel or aluminum alloy. The nut 1 and cover 2, integrally formed from stainless steel or aluminum alloy, combine high strength, corrosion resistance, precise thread adaptation, and excellent sealing and support performance, making them suitable for various duct protection needs.

[0038] In this embodiment, the sealing ring 3 is made of EPDM rubber or silicone rubber with a Shore hardness of 60-80A. The sealing ring 3, made of EPDM rubber or silicone rubber with a Shore hardness of 60-80A, has both good elasticity and resistance to compression deformation, and can effectively fill the sealing gap under different working conditions, ensuring the long-lasting sealing performance and reliability of the protective cap.

[0039] In this embodiment, the internal thread 4 has a triangular thread profile, and its thread specification is compatible with the external thread of the self-tapping screw 10. The thread accuracy is 6H / 6g grade, and the effective engagement length of the internal thread 4 is not less than 1.5 times the outer diameter of the self-tapping screw 10. By using a 6H / 6g grade precision triangular internal thread 4, which precisely matches the external thread of the self-tapping screw 10, and with an effective engagement length ≥ 1.5 times the screw's outer diameter, the threaded connection is ensured to be tight, with excellent anti-loosening performance, and remains stable and does not fall off even under vibration and airflow impact.

[0040] In this embodiment, the sealing groove 5 is a rectangular cross-section groove, and the sealing ring 3 protrudes from the opening end face of the nut 1 by 1 to 3 mm. The rectangular cross-section sealing groove 5, together with the sealing ring 3 with a protrusion height of 1-3 mm, can form a precise compression amount during screwing, ensuring that the sealing ring fully fills the gap, achieving reliable sealing and avoiding excessive compression that could lead to elastic failure.

[0041] In this embodiment, the cover 2 is a hemispherical or frustum-shaped structure. The hemispherical or frustum-shaped cover 2 reduces airflow resistance inside the duct through its streamlined design, while also enhancing the protection of the self-tapping screw tips.

[0042] In this embodiment, the protective caps are available in various models according to the specifications of the self-tapping screws 10. The tolerance fit between the diameter of the internal thread 4 and the diameter of the external thread of the corresponding self-tapping screw 10 is H7 / g6. The protective caps, which are available in various models according to the specifications of the self-tapping screws 10 and have a tolerance fit between the internal thread 4 and the external thread of H7 / g6, can achieve precise fitting and tight connection, meeting the protection requirements of screws of different specifications.

[0043] Please refer to Figure 5. This utility model also provides a duct connection structure, including a duct body 20, a self-tapping screw 10, and the aforementioned protective cap. The self-tapping screw 10 passes through the connection part of the duct body 20, and the screw tip protrudes from the inner wall of the duct body 20. The protective cap is screwed to the external thread of the self-tapping screw 10 through the internal thread 4, and the sealing ring 3 is squeezed between the open end face of the nut 1 and the inner wall of the duct body 20 to form a sealing structure.

[0044] The duct connection structure forms a stable and sealed protective system through the threaded connection of the self-tapping screw 10, the protective cap and the duct body 20 and the sealing ring 3, which effectively avoids the screw tip scratching and air leakage, and improves the reliability of the duct system.

[0045] The method of using the protective cap for the tip of the self-tapping screw for fixing the duct is as follows: Screw the self-tapping screw 10 into the duct connection part so that the screw tip protrudes from the inner wall of the duct; hold the cover 2 of the protective cap and align the internal thread 4 of the nut 1 with the external thread of the self-tapping screw 10; rotate the protective cap clockwise so that the internal thread 4 and the external thread are screwed together until the sealing ring 3 contacts the inner wall of the duct and is compressed and deformed; so that the protective cap is firmly fixed to the tip of the self-tapping screw 10.

[0046] In the description of this utility model, it should be noted that the terms "upper" and "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying importance; the words "bottom surface" and "top surface," "inner" and "outer" respectively refer to the geometric direction toward or away from a specific component.

[0047] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0048] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A protective cap for the tip of a self-tapping screw used for fixing ducts, for installation on the tip of a self-tapping screw (10) for protection, characterized in that: The protective cap includes a nut (1), a cover (2), and a sealing ring (3); the nut (1) is integrally connected to the cover (2), the cover (2) closes one end of the nut (1), and the other end of the nut (1) is an open end with an internal thread (4), the internal thread (4) is used to screw into the external thread of the self-tapping screw (10); a sealing groove (5) is formed on the open end face of the nut (1), the sealing ring (3) is embedded in the sealing groove (5), and the sealing ring (3) protrudes from the open end face of the nut (1) so that the sealing ring (3) is squeezed when the nut (1) is screwed to the tip of the self-tapping screw (10) to achieve the sealing of the open end of the nut (1).

2. The ductwork fixing self-tapping screw tip guard cap of claim 1, wherein: The nut (1) and the cover (2) are integrally formed from metal.

3. The ductwork fixing self-tapping screw tip guard cap of claim 2, wherein: The metal material is stainless steel or aluminum alloy.

4. The protective cap for the tip of the self-tapping screw for fixing the duct as described in claim 1, characterized in that: The sealing ring (3) is made of EPDM rubber or silicone rubber with a Shore hardness of 60-80A.

5. The protective cap for the tip of the self-tapping screw for fixing the duct as described in claim 1, characterized in that: The internal thread (4) has a triangular thread profile, and the thread specification is compatible with the external thread of the self-tapping screw (10). The thread accuracy is 6H / 6g grade, and the effective engagement length of the internal thread (4) is not less than 1.5 times the outer diameter of the self-tapping screw (10).

6. The protective cap for the tip of the self-tapping screw for fixing the duct as described in claim 1, characterized in that: The sealing groove (5) is a rectangular cross-section groove.

7. The ductwork anchor self-tapping screw tip guard cap of claim 1, wherein: The height of the sealing ring (3) protruding from the open end face of the nut (1) is 1 to 3 mm.

8. The ductwork anchor self-tapping screw tip guard cap of claim 1, wherein: The cover (2) is a hemispherical or frustum-shaped structure.

9. The ductwork anchor self-tapping screw tip guard cap of claim 1, wherein: The protective cap is divided into various models according to the specifications of the self-tapping screw (10). The tolerance matching between the diameter of the internal thread (4) of each model and the diameter of the external thread of the corresponding self-tapping screw (10) is H7 / g6.

10. An air duct connecting structure characterized by comprising: The device includes a duct body (20), a self-tapping screw (10), and a protective cap as described in any one of claims 1-9; the self-tapping screw (10) passes through the connection part of the duct body (20), and the tip of the screw protrudes from the inner wall of the duct body (20); the protective cap is screwed to the external thread of the self-tapping screw (10) through the internal thread (4), and the sealing ring (3) is squeezed between the open end face of the nut (1) and the inner wall of the duct body (20) to form a sealing structure.

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