A 1 / 2 internal pressure dust cap

Abstract

This utility model relates to the field of mechanical component protection technology, and in particular to a 1 / 2 internal pressure dust cap with good sealing effect and high durability. It includes an elastic dust cap body, the dust cap body having a circular end face with a front and a back. A first annular convex ring is provided in the center of the back of the end face for embedding in a threaded hole. At least three locking blocks are evenly distributed around the outer periphery of the first convex ring, each locking block being distributed along the axial direction of the first convex ring. The locking blocks are inclined, and their thickness gradually decreases from one end closer to the end face to the other. At least three locking slots are evenly distributed along the outer edge of each locking block for engaging the threaded teeth in the threaded hole. A second annular convex ring is provided on the periphery of the back of the end face, the axial length of the second convex ring being smaller than that of the first convex ring. A protruding tab is provided on the side edge of the end face.

Description

Technical Field

[0001] This utility model relates to the field of mechanical parts protection technology, and in particular to a 1 / 2 internal pressure dust cap. Background Technology

[0002] In the fields of mechanical assembly and tap water systems, screw hole dustproof technology has long faced three major technical bottlenecks: First, traditional external snap-on dust caps rely on interference fit for fixation, which is prone to falling off and has poor sealing; second, the current rubber plug solution suffers from the problem of reduced sealing performance due to material aging, leading to the risk of secondary pollution. Experiments show that after continuous use at 80℃ for 6 months, the permanent compression deformation exceeds 40%; third, as precision instruments demand higher levels of dustproofing at the micron level, existing dustproof structures are unable to meet cleanliness requirements, especially for micro screw holes smaller than M3, where existing products cannot achieve non-destructive disassembly and assembly. Utility Model Content

[0003] Therefore, in view of the above problems, this utility model provides a 1 / 2 internal pressure dust cap with good sealing effect and strong durability.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A 1 / 2 internal pressure dust cap includes an elastic dust cap body. The dust cap body includes a circular end face with a front and a back. The back of the end face has a first annular convex ring for embedding in a threaded hole. At least three locking blocks are evenly distributed around the outer periphery of the first convex ring. The locking blocks are distributed along the axial direction of the first convex ring and are inclined. The thickness of the locking blocks gradually decreases from one end near the end face to the other end. At least three locking slots are evenly distributed along the outer edge of the locking blocks for locking the threaded teeth in the threaded hole. The back of the end face has a second annular convex ring with a smaller axial length than the first convex ring. A protruding tab is provided on the side edge of the end face.

[0006] Furthermore, the angle between the card block and the first convex ring is 15° to 30°, and the end of the card block is provided with a rounded corner structure of 0.2mm to 0.5mm.

[0007] Furthermore, the inner side of the second convex ring is provided with an annular sealing groove, and an O-ring is embedded in the annular sealing groove.

[0008] Furthermore, the depth of the bayonet is 1 / 3 to 1 / 2 of the thread tooth height, and the inner wall of the bayonet is provided with a curved surface structure that matches the thread tooth profile.

[0009] Furthermore, the surface of the protrusion is provided with anti-slip texture, the depth of the protective texture is 0.3mm to 0.8mm, and the direction of the protective texture is at a 45° angle to the direction of disassembly force.

[0010] By adopting the aforementioned technical solution, the beneficial effects of this utility model are as follows: This 1 / 2 internal pressure dust cap forms a primary seal through the interference fit between the first convex ring and the screw hole, and the second convex ring serves as an auxiliary sealing ring. The double convex ring structure makes the sealing pressure distribution more uniform. The inclined distribution of the locking blocks, combined with the gradually thinning design, generates elastic deformation during insertion to achieve self-centering. During disassembly, the engagement of the locking jaws with the thread teeth generates a reverse locking force. Furthermore, the special design for screw holes smaller than M3, with the gradient change in the thickness of the locking blocks, avoids stress concentration and reduces damage. At the same time, the convex tabs facilitate the dust cap body, reducing the torque required for manual operation and improving efficiency compared to traditional tool disassembly methods. Attached Figure Description

[0011] Figure 1 This is a top view of an embodiment of the present invention.

[0012] Figure 2 This is a bottom view of the structure of an embodiment of the present utility model;

[0013] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure at point AA;

[0014] Figure 4 yes Figure 3 A magnified view of a section at point B. Detailed Implementation

[0015] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0016] The embodiment of this utility model is as follows:

[0017] refer to Figures 1 to 4As shown, a 1 / 2 internal pressure dust cap includes an elastic dust cap body. The dust cap body includes a circular end face 1, which has a front and a back. The back of the end face 1 has a first annular protruding ring 2 for embedding into a screw hole. At least three locking blocks 3, preferably four locking blocks 3, are evenly distributed around the outer periphery of the first annular protruding ring 2. Each locking block 3 is distributed along the axial direction of the first annular protruding ring 2 and is inclined. The thickness of the locking block 3 gradually decreases from one end near the end face to the other end. At least three locking slots 4, preferably four locking slots 4, are evenly distributed on the outer edge of the locking block 3 for locking the thread teeth in the thread hole. The back of the end face 1 has a second annular protruding ring 5, which has a smaller axial length than the first annular protruding ring 2. The side edge of the end face 1 has a protruding tab 6 protruding outward.

[0018] This 1 / 2 internal pressure dust cap forms a primary seal through the interference fit between the first convex ring 2 and the screw hole, while the second convex ring 5 serves as an auxiliary sealing ring. The double convex ring structure makes the sealing pressure distribution more uniform. The inclined distribution of the locking blocks 3, combined with the gradually thinning design, generates elastic deformation during insertion to achieve self-centering. During disassembly, the locking jaws 4 engage with the thread teeth to generate a reverse locking force. In addition, the special design for screw holes smaller than M3, with the gradient change in the thickness of the locking blocks, avoids stress concentration and reduces damage. At the same time, the convex plate 6 facilitates the dust cap body, reducing the torque required for manual operation and improving efficiency compared to traditional tool disassembly methods.

[0019] Furthermore, the tilt angle between the locking block 3 and the first convex ring 2 is 15° to 30°, preferably 20°, and the end of the locking block 3 is provided with a rounded corner structure 7 of 0.2mm to 0.5mm, preferably 0.3mm. The 15° to 30° tilt angle allows the locking block 3 to form a progressive stress distribution during compression. Finite element analysis shows that the dispersion of the maximum stress point is improved, and the fatigue life of the material is extended. The 0.2 to 0.5mm rounded corner structure 7 ensures smooth assembly and avoids thread scratches caused by sharp angles.

[0020] Furthermore, the inner side of the second convex ring 5 is provided with an annular sealing groove 8, and an O-ring 9 is embedded in the annular sealing groove 8. The O-ring 9 and the annular sealing groove 8 form a secondary sealing interface. In the aging test at 80℃, its compression permanent deformation is only 1 / 4 of that of the traditional rubber stopper, and it can withstand chemical corrosion of pH 2-12. Moreover, the depth-to-width ratio design of the annular sealing groove 8 enables the O-ring 9 to maintain a stable contact pressure within the pressure range of 0.1-0.6MPa, thereby improving the sealing performance.

[0021] Meanwhile, the depth of the bayonet 4 is 1 / 3 to 1 / 2 of the thread height, preferably 1 / 3, and the inner wall of the bayonet 4 is provided with a curved surface structure that matches the thread profile, which ensures sufficient engagement area (contact area up to 85%) and retains thread lead margin, so that the assembly rotation angle error is small, and the curved surface structure that matches the thread profile increases the contact pressure per unit area.

[0022] Furthermore, the surface of the protrusion 6 is provided with anti-slip texture 10. The depth of the protective texture 10 is 0.3mm to 0.8mm, preferably 0.5mm. The direction of the protective texture 10 is at a 45° angle to the direction of disassembly force. The 0.3 to 0.8mm texture depth combined with the 45° direction forms a micro ratchet effect, improving the success rate of operation in wet and slippery environments.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0026] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A ½-inch internal pressure dust cap, characterized in that: The device includes a flexible dust cap body, which has a circular end face with a front and a back. A first annular convex ring is located in the center of the back of the end face for embedding in a threaded hole. At least three locking blocks are evenly distributed around the outer periphery of the first convex ring, with each locking block distributed along the axial direction of the first convex ring. The locking blocks are inclined, and their thickness gradually decreases from one end closer to the end face to the other. At least three locking slots are evenly distributed along the outer edge of each locking block for engaging the threaded teeth in the threaded hole. A second annular convex ring is located on the periphery of the back of the end face, with the axial length of the second convex ring being smaller than that of the first convex ring. A protruding tab is also provided on the side edge of the end face.

2. The ½-inch internal pressure dust cap according to claim 1, characterized in that: The angle between the card block and the first convex ring is 15° to 30°, and the end of the card block is provided with a rounded corner structure of 0.2mm to 0.5mm.

3. The ½-inch internal pressure dust cap according to claim 1, characterized in that: The inner side of the second convex ring is provided with an annular sealing groove, and an O-ring is embedded in the annular sealing groove.

4. The ½-inch internal pressure dust cap according to claim 1, characterized in that: The depth of the bayonet is 1 / 3 to 1 / 2 of the thread tooth height, and the inner wall of the bayonet is provided with a curved surface structure that matches the thread tooth profile.

5. The ½-inch internal pressure dust cap according to claim 1, characterized in that: The surface of the protrusion is provided with protective texture, the depth of which is 0.3mm to 0.8mm, and the direction of the protective texture is at a 45° angle to the direction of the disassembly force.

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