High-strength corrosion-resistant special cylindrical nut

Abstract

The utility model relates to the technical field of fixing nuts, in particular to a high-strength corrosion-resistant special cylindrical nut which comprises a nut body and sealing mechanisms arranged at the two ends of the nut body, each sealing mechanism comprises a threaded sealing ring and a fixed sealing ring which are integrally formed, and a threaded hole is formed in the center of each nut sealing ring. A threaded hole of the threaded sealing ring is matched with a threaded hole of the nut body, the inner diameter of the threaded hole of the threaded sealing ring is smaller than that of the threaded hole of the nut body, the section of the fixed sealing ring is in a T shape, and the small T-shaped end of the fixed sealing ring is integrally connected with the threaded sealing ring. A stepped ring groove matched with a threaded hole is formed in an opening of the threaded hole in the end of the nut body, a T-shaped ring groove matched with the fixed sealing ring is formed in the stepped ring groove, and the fixed sealing ring is arranged in the T-shaped ring groove in an interference fit mode. And external chemical reagents are prevented from entering the threads to cause corrosion.

Description

Technical Field

[0001] This utility model relates to the field of fixing nut technology, specifically to a high-strength, corrosion-resistant cylindrical nut. Background Technology

[0002] Nuts are parts used in conjunction with bolts to achieve a fastening effect. In chemical processing, various chemical reagents are frequently used, most of which are corrosive. When nuts come into contact with corrosive liquids, the internal threads can rust, leading to corrosion and seizing of the internal thread fit, affecting the nut's performance and effectiveness. Especially in high-strength and highly corrosive environments, traditional nuts often cannot meet the requirements for long-term use, easily experiencing problems such as sealing failure and thread corrosion, resulting in reduced fastening effectiveness and even safety hazards. Although there are some improved nut designs in existing technology, they still have shortcomings in terms of high strength, corrosion resistance, and sealing performance, and cannot effectively solve the above problems. Therefore, existing technologies urgently need improvement to address these issues. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a high-strength, corrosion-resistant special cylindrical nut.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a high-strength, corrosion-resistant cylindrical nut, comprising a nut body and sealing mechanisms disposed at both ends of the nut body. The sealing mechanism includes an integrally formed threaded sealing ring and a fixed sealing ring. The nut sealing ring has a threaded hole at its center, and the threaded hole of the threaded sealing ring is adapted to the threaded hole of the nut body. The inner diameter of the threaded hole of the threaded sealing ring is smaller than the inner diameter of the threaded hole of the nut body. The fixed sealing ring has a T-shaped cross-section, and the small end of the T-shape of the fixed sealing ring is integrally connected to the threaded sealing ring. A stepped annular groove that mates with the threaded hole is provided at the end of the threaded hole of the nut body. A T-shaped annular groove that mates with the fixed sealing ring is provided in the stepped annular groove. The fixed sealing ring is interference-fitted into the T-shaped annular groove.

[0005] In some embodiments, the sealing mechanism is made of two rubber materials with different hardnesses through layered injection molding to achieve a soft-hard combination, and the hardness of the fixed sealing ring is greater than that of the threaded sealing ring.

[0006] In some embodiments, the fixed sealing ring is sleeved around the outside of the threaded sealing ring, and the T-shaped ring groove is disposed on the side wall of the stepped ring groove.

[0007] In some embodiments, the fixed sealing ring is disposed on the lower end side of the threaded sealing ring, and the T-shaped ring groove is disposed on the bottom end face of the stepped ring groove.

[0008] In some embodiments, the thickness of the threaded sealing ring is less than or equal to the height of the stepped ring groove.

[0009] Compared with the prior art, the beneficial effects of this utility model are: by designing the difference in inner diameter between the threaded sealing ring of the sealing mechanism and the threaded hole of the nut body, and by the interference fit between the fixed sealing ring and the T-shaped ring groove, corrosive liquids are effectively prevented from seeping into the thread, while enhancing the stability of the sealing structure. It has the advantages of improving sealing performance and corrosion resistance, and extending service life.

[0010] Details of one or more embodiments of this application are set forth in the following drawings and description to make other features, objects and advantages of this application more readily apparent. The embodiments of this application will provide a detailed description and understanding of the application. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of Embodiment 1;

[0012] Figure 2 This is a schematic diagram of the end face of Example 1;

[0013] Figure 3 This is a cross-sectional view of the sealing structure mating area in Embodiment 1;

[0014] Figure 4 This is a schematic diagram of the stepped annular groove on the end face of the nut in Embodiment 1;

[0015] Figure 5 This is a schematic diagram of the sealing structure in Example 1;

[0016] Figure 6 This is a schematic diagram of the structure of Example 2;

[0017] Figure 7 This is a schematic diagram of the end face of Embodiment 2;

[0018] Figure 8 This is a cross-sectional view of the sealing structure mating area in Embodiment 2;

[0019] Figure 9 This is a schematic diagram of the stepped annular groove on the end face of the nut in Embodiment 2;

[0020] Figure 10 This is a schematic diagram of the sealing structure in Example 2.

[0021] In the diagram: 1. Nut body; 2. Sealing mechanism; 3. Threaded sealing ring; 4. Fixed sealing ring; 5. Stepped ring groove; 6. T-shaped ring groove. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] In existing technologies, nuts, as fasteners, have long faced the problem of corrosion from corrosive media in chemical processing. When traditional nuts come into contact with corrosive liquids, the threaded parts are prone to corrosion, leading to failure of the threaded fit. Existing solutions mostly use surface plating or additional sealing gaskets, but plating is susceptible to wear and peeling, and additional seals are prone to aging and increase assembly complexity. In chemical equipment involving highly corrosive reagents, nuts need to be repeatedly disassembled and reassembled and are exposed to corrosive environments for extended periods, making it difficult for existing structures to balance sealing reliability and structural stability.

[0024] To address the aforementioned issues, a high-strength, corrosion-resistant cylindrical nut was designed to prevent corrosive media from penetrating the threaded gaps while ensuring the sealing structure remained intact during frequent disassembly and assembly. The inventors analyzed the fluid penetration path and discovered that the thread root and nut end face were the primary channels for media penetration. Based on this, they attempted to integrate the sealing structure into both ends of the nut body and achieve self-locking fixation through structural interference. Further investigation revealed that simply increasing the sealing ring thickness affected the effective thread length, and adding a sealing ring between the nut and the contact surface of another device reduced the nut's tightening effect. Therefore, a dual-type sealing ring design was adopted, preserving the thread length while forming a double sealing barrier.

[0025] Therefore, as Figure 1-10 This application proposes a nut body 1 and a sealing mechanism 2 disposed at both ends of the nut body 1. The sealing mechanism 2 includes an integrally formed threaded sealing ring 3 and a fixed sealing ring 4. The nut sealing ring has a threaded hole at its center. The threaded hole of the threaded sealing ring 3 is adapted to the threaded hole of the nut body 1, and the inner diameter of the threaded hole of the threaded sealing ring 3 is smaller than the inner diameter of the threaded hole of the nut body 1. The fixed sealing ring 4 has a T-shaped cross-section. The small end of the fixed sealing ring 4 is integrally connected to the threaded sealing ring 3. The end of the threaded hole of the nut body 1 has a stepped annular groove 5 that mates with the threaded hole. The stepped annular groove 5 has a T-shaped annular groove 6 that mates with the fixed sealing ring 4. The fixed sealing ring 4 is interference-fitted into the T-shaped annular groove 6.

[0026] By setting up a sealing structure and designing the difference in inner diameter between the threaded sealing ring 3 of the sealing mechanism 2 and the threaded hole of the nut body 1, as well as the interference fit between the fixed sealing ring 4 and the T-shaped ring groove 6, corrosive liquids are effectively prevented from seeping into the thread, while enhancing the stability of the sealing structure. This has the advantages of improving sealing performance and corrosion resistance, and extending service life.

[0027] Among them, the threaded sealing ring 3 refers to an annular seal with a threaded through hole, which can be injection molded from an elastic material. Its inner diameter is slightly smaller than the threaded hole of the nut body 1, and it is used to form an initial seal when the bolt is screwed in. The fixed sealing ring 4 refers to an annular structure with a T-shaped cross-section, which can be made of a high-rigidity polymer. Its small end is connected to the threaded sealing ring 3 to form an integral structure, and its large end is embedded in the annular groove of the nut body 1 to form a mechanical lock and prevent axial displacement of the sealing mechanism 2. The T-shaped annular groove 6 refers to a groove with a T-shaped cross-section machined on the end face of the nut body 1. It can be formed by CNC machine tool cutting. The specific cutting method is to first cut a stepped annular groove 5, then cut the small end groove of the T-shaped annular groove 6 on the stepped annular groove 5, and then cut an annular groove on both sides of the inner end of the small end groove to form an integral T-shaped annular groove 6. In the case of use environment where the strength is reduced, the nut can also be integrally formed by injection molding.

[0028] Specifically, in use, when the bolt is screwed into the nut, the internal thread of the threaded sealing ring 3 tightly engages with the external thread of the bolt. Its small inner diameter forces the sealing ring material to undergo elastic deformation, filling the thread gap. Simultaneously, the T-shaped structure of the fixing sealing ring 4 is pressed into the T-shaped annular groove 6 on the nut. The reaction force generated by the material compression ensures that the sealing ring fits tightly against the groove wall, forming a continuous circumferential seal. These two sealing structures act on the thread engagement area and the stepped annular groove 5 area of ​​the nut, respectively, forming a double barrier that physically isolates corrosive media.

[0029] Compared to existing technologies, conventional nuts rely on a single sealing gasket or surface treatment layer, which is prone to sealing failure under dynamic loads. This solution utilizes the synergistic effect of the threaded sealing ring 3 and the fixed sealing ring 4 to simultaneously form a sealing interface inside the threaded pair and on the end face. Compared to a split sealing ring structure, the integrated sealing mechanism 2 avoids the risk of assembly misalignment, and the mechanical locking design of the T-shaped ring groove 6 ensures the stability of the sealing structure under vibration conditions.

[0030] Through the above technical solution, this application effectively blocks the penetration path of corrosive liquids along the thread gap and nut end face, maintaining the normal mating function of the threaded pair under long-term immersion in chemical reagents. The sealing structure achieves self-locking fixation through interference fit, eliminating the need for additional fasteners and ensuring that the sealing component does not shift or fall off during frequent disassembly and assembly, thus extending the service life of the nut under highly corrosive conditions.

[0031] To improve the fit between the sealing structure and the nut body 1 and the structural stability, the sealing mechanism 2 is made of two rubber materials with different hardnesses through layered injection molding to achieve a soft-hard combination. The hardness of its fixed sealing ring 4 is greater than that of the threaded sealing ring 3.

[0032] Layered injection molding refers to a molding process in which different materials are injected into a mold in layers. This can be achieved using a two-color injection molding machine in conjunction with a composite mold, by controlling the injection sequence of different materials to form a layered structure. Soft-hard bonding refers to the formation of a composite material with complementary properties between two materials. This can be achieved using a combination of silicone rubber and fluororubber, where the elastomer and rigid material fuse through intermolecular bonding. The hardness design of the fixed sealing ring 4 refers to the component having a higher Shore hardness value. This can be achieved by adjusting the content of carbon black or fillers in the rubber formulation, allowing the component to maintain structural stability under pressure.

[0033] Specifically, the two rubber materials are injection molded in layers in a mold to form an integral structure. The high-hardness material constitutes the main body of the fixed sealing ring 4, while the low-hardness material wraps around the threaded sealing ring 3 area. When the nut body 1 is tightened with the bolt, the soft material of the threaded sealing ring 3 undergoes elastic deformation to fill the thread gap, preventing corrosive media from penetrating; the hard material of the fixed sealing ring 4 generates a lasting clamping force through an interference fit, preventing the sealing ring from loosening from the ring groove after long-term use. The two materials form a mechanical gradient under stress, and the elastic deformation of the threaded area and the rigid support of the fixed area form a dynamic balance.

[0034] Compared to existing technologies, traditional sealing nuts often use a single-material sealing ring, which results in a performance degradation when balancing sealing performance and structural strength. By adopting layered injection molding technology, the flexibility of the threaded sealing part and the rigid support of the fixing part can be achieved simultaneously, overcoming the contradiction between the elastic deformation capacity and the resistance to permanent deformation of a single material.

[0035] Through the above technical solution, this application effectively solves the problem of thread corrosion caused by corrosive media seeping into the thread gaps, while avoiding sealing failure due to plastic deformation of the sealing ring during repeated disassembly and reassembly. The synergistic effect of the two materials ensures both the sealing effect during initial assembly and the structural integrity during long-term use.

[0036] Example 1

[0037] Based on the technical solution of the present invention, in this embodiment, as follows: Figure 1-5 As shown, the fixed sealing ring 4 is sleeved around the outside of the threaded sealing ring 3, and the T-shaped ring groove 6 is disposed on the side wall of the stepped ring groove 5.

[0038] Example 2

[0039] Based on the technical solution of the present invention, in this embodiment, as follows: Figure 6-10 As shown, the fixed sealing ring 4 is disposed on the lower end side of the threaded sealing ring 3, and the T-shaped ring groove 6 is disposed on the bottom end face of the stepped ring groove 5.

[0040] The thickness of the threaded sealing ring 3 is less than or equal to the height of the stepped ring groove 5.

[0041] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-strength, corrosion-resistant cylindrical nut, characterized in that: The device includes a nut body and sealing mechanisms disposed at both ends of the nut body. The sealing mechanism includes an integrally formed threaded sealing ring and a fixed sealing ring. The nut sealing ring has a threaded hole at its center, which is adapted to the threaded hole of the nut body. The inner diameter of the threaded hole of the threaded sealing ring is smaller than that of the threaded hole of the nut body. The fixed sealing ring has a T-shaped cross-section, and the small end of the T-shape of the fixed sealing ring is integrally connected to the threaded sealing ring. The end of the threaded hole of the nut body has a stepped annular groove that mates with the threaded hole. A T-shaped annular groove that mates with the fixed sealing ring is disposed within the stepped annular groove. The fixed sealing ring is interference-fitted within the T-shaped annular groove.

2. The high-strength, corrosion-resistant cylindrical nut according to claim 1, characterized in that: The sealing mechanism is made of two rubber materials with different hardnesses through layered injection molding to achieve a soft-hard combination. The hardness of the fixed sealing ring is greater than that of the threaded sealing ring.

3. The high-strength, corrosion-resistant cylindrical nut according to claim 1, characterized in that: The fixed sealing ring is sleeved around the outside of the threaded sealing ring, and the T-shaped ring groove is provided on the side wall of the stepped ring groove.

4. The high-strength corrosion-resistant special cylindrical nut according to claim 1, characterized in that: The fixed sealing ring is located on the lower end side of the threaded sealing ring, and the T-shaped ring groove is located on the bottom end face of the stepped ring groove.

5. A high-strength, corrosion-resistant cylindrical nut according to claim 1, characterized in that: The thickness of the threaded sealing ring is less than or equal to the height of the stepped ring groove.

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