A type of rust-proof nut with washer

Abstract

This utility model mainly relates to the field of fastener technology, specifically to a rust-proof nut with a washer, including a nut body and a rust-proof washer detachably installed at its bottom. The rust-proof washer has an annular oil reservoir inside, and its inner sidewall has a guide hole that communicates with the annular oil reservoir along the radial direction. An oil injection pipe is slidably assembled in the guide hole. The inner end of the oil injection pipe protrudes slightly from the inner side of the rust-proof washer and has a ball head structure, while the outer end extends into the annular oil reservoir. The oil injection pipe has an expansion section and a throttling section in sequence from its inner end. The throttling section has a valve core that can slide axially. One end of the valve core is connected to a limit ring fixed in the expansion section by a return spring, and the other end is always in contact with a push rod under the action of the return spring. The push rod is fixedly installed on the inner wall of the annular oil reservoir. After the bolt squeezes the ball head end of the oil injection pipe, the push rod will push the valve core to overcome the spring force and move into the expansion section, so that the lubricating oil is discharged from the oil injection pipe to the bolt surface.

Description

Technical Field

[0001] This utility model mainly relates to the field of fastener technology, specifically to a rust-proof nut with a washer. Background Technology

[0002] As one of the most basic and widely used mechanical fasteners, the reliability of nuts directly affects the stability and safety of the entire connection structure. In high-humidity or corrosive industrial environments such as outdoor facilities, ships, and chemical equipment, nuts made of materials such as carbon steel are highly susceptible to moisture and corrosive media intrusion after being screwed onto bolts, leading to electrochemical corrosion. Once the threaded pair corrodes, it greatly increases the resistance to disassembly, often causing the nut to be unable to be tightened properly during subsequent maintenance or repair, or even resulting in thread seizure or bolt breakage, greatly complicating equipment maintenance, increasing repair costs, and posing safety risks.

[0003] To address this issue, the most common practice in existing technologies is for operators to manually apply lubricating and rust-preventive oil (such as grease or mineral oil) to the threaded holes of the nuts or the threaded sections of the bolts before installation. This aims to create an oil film that isolates air and moisture and provides lubrication. However, this manual application method has significant drawbacks: First, it relies on the operator's conscientiousness and attention to detail, and may miss areas in batch assembly or hard-to-reach parts, leading to inconsistent rust prevention. Second, the lubricating grease easily stains the operator's hands, tools, and work clothes, affecting cleanliness, causing a slippery and uncomfortable feeling, and is difficult to clean. Finally, this process increases the complexity and time cost of assembly, reducing assembly efficiency. Utility Model Content

[0004] 1. The technical problem to be solved by the utility model: This utility model provides a rust-proof nut with a washer to solve the technical problems existing in the background art.

[0005] 2. Technical Solution: To achieve the above objectives, the technical solution provided by this utility model is as follows: a rust-proof nut with a washer, comprising a nut body and a rust-proof washer detachably installed at its bottom. The rust-proof washer has an annular oil reservoir inside, and its inner sidewall has a guide hole that communicates with the annular oil reservoir along the radial direction. An oil injection pipe is slidably assembled in the guide hole. The inner end of the oil injection pipe protrudes slightly from the inner side of the rust-proof washer and has a ball head structure, while the outer end extends into the annular oil reservoir. The oil injection pipe is provided with an expansion section and a throttling section in sequence from its inner end. The throttling section is provided with a valve core that can slide axially. One end of the valve core is connected to a limit ring plate fixed in the expansion section by a return spring, and the other end is always in contact with the push rod under the action of the return spring. The push rod is fixedly installed on the inner wall of the annular oil storage cavity.

[0006] Furthermore, the guide holes are provided in multiple locations and are evenly distributed along the circumference of the anti-rust gasket.

[0007] Furthermore, the outer wall of the oil injection pipe is fixedly fitted with several equidistant first sealing rings, and the first sealing rings form a sealing sliding fit with the inner wall of the guide hole.

[0008] Furthermore, the outer wall of the valve core is fixedly fitted with several equidistantly arranged second sealing rings, and the second sealing rings form a sealing sliding fit with the inner wall of the throttling section.

[0009] Furthermore, the outer side of the anti-rust gasket is provided with an oil injection hole that communicates with the annular oil storage cavity, and a sealing plug is provided in the oil injection hole.

[0010] Furthermore, the top of the anti-rust washer is coaxially provided with an integrally formed mounting protrusion ring, the inner wall of which is machined with internal threads, and the bottom of the nut body is provided with an annular groove that matches the mounting protrusion ring, the inner wall of which is machined with external threads that mate with the internal threads.

[0011] 3. Beneficial effects: Compared with the prior art, the technical solution provided by this utility model has the following beneficial effects: the outer surface of the bolt radially presses the ball end of the oil injection pipe, pushing the oil injection pipe to slide inward along the guide hole. Then, the push rod pushes the valve core to overcome the force of the return spring and move from the throttling section to the expansion section. Subsequently, the lubricating oil in the annular oil storage chamber enters the expansion section through the throttling section and is finally discharged from the ball end of the oil injection pipe to the bolt surface, realizing lubrication and air isolation, effectively preventing the thread pair from rusting. This structure realizes automatic application of lubricating oil during nut assembly, eliminating the manual lubrication step, avoiding oil contamination, and improving assembly efficiency and cleanliness. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the exploded structure of the nut body and the anti-rust washer of this utility model; Figure 3 This is a cross-sectional view of the rust-proof washer of this utility model; Figure 4 For the present utility model Figure 3 Enlarged structural diagram at point A in the middle.

[0013] Figure label: 1. Nut body; 101. Annular groove; 102. External thread; 2. Rust-proof washer; 201. Annular oil reservoir; 202. Guide hole; 203. Oil injection hole; 204. Mounting convex ring; 205. Internal thread; 3. Oil injection pipe; 301. Expanded diameter section; 302. Throttling section; 4. Valve core; 5. Limiting ring; 6. Return spring; 7. Push rod; 8. First sealing ring; 9. Second sealing ring; 10. Sealing plug. Detailed Implementation

[0014] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the utility model will be more thorough and complete.

[0015] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "page", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0016] 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 utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0017] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," and "equipped with" 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 internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. Example

[0018] See attached document Figure 1-4A rust-proof nut with a washer includes a nut body 1 and a rust-proof washer 2 detachably installed at its bottom. The rust-proof washer 2 has an annular oil storage cavity 201 inside. Its inner side wall has a guide hole 202 that communicates with the annular oil storage cavity 201 in the radial direction. An oil injection pipe 3 is slidably assembled in the guide hole 202. The inner end of the oil injection pipe 3 protrudes slightly from the inner side of the rust-proof washer 2 and has a ball head structure. The outer end extends into the annular oil storage cavity 201. The oil injection pipe 3 has an expansion section 301 and a throttling section 302 arranged sequentially from its inner end. The throttling section 302 is equipped with a valve core 4 that can slide axially. One end of the valve core 4 is connected to a limit ring 5 fixed in the expansion section 301 by a return spring 6. The other end is always in contact with the push rod 7 under the action of the return spring 6. The push rod 7 is fixedly installed on the inner wall of the annular oil storage chamber 201.

[0019] In this embodiment, after the anti-rust washer 2 is assembled to the bottom of the nut body 1, when the nut assembly is screwed onto the matching threaded rod or bolt, the anti-rust washer 2 is fitted onto the outside of the bolt and moves down synchronously. During this process, the ball end of the oil injection pipe 3 is radially squeezed by the outer surface of the bolt, pushing the oil injection pipe 3 to slide inward along the guide hole 202, thereby causing the push rod 7 to push the valve core 4 to overcome the force of the return spring 6 and move from the throttling section 302 into the expansion section 301. At this time, the lubricating oil pre-stored in the annular oil storage chamber 201 enters the expansion section 301 through the throttling section 302 and is finally discharged from the outlet of the ball end of the oil injection pipe 3 to the bolt surface, achieving lubrication and isolating air, thereby effectively preventing the thread pair from rusting. This structure realizes the function of automatically coating the nut with lubricating oil during the assembly process, which not only saves the manual lubrication step, but also avoids oil contamination, and improves assembly efficiency and cleanliness.

[0020] In the above embodiment, there are multiple guide holes 202, which are evenly distributed along the circumference of the anti-rust washer 2. Therefore, each guide hole 202 is provided with an independent oil injection mechanism. This multi-way oil injection design can form a uniform and comprehensive lubrication coverage on the bolt when the nut body 1 is screwed on, which significantly improves the oil injection efficiency and the reliability of the anti-rust effect.

[0021] The outer wall of the oil injection pipe 3 is fixedly fitted with several equidistant first sealing rings 8. The first sealing rings 8 form a sealing sliding fit with the inner wall of the guide hole 202 to prevent the lubricating oil in the annular oil storage cavity 201 from leaking through the gap between the guide hole 202 and the oil injection pipe 3.

[0022] The outer wall of the valve core 4 is fixedly fitted with several equidistantly arranged second sealing rings 9. The second sealing rings 9 form a sealing sliding fit with the inner wall of the throttling section 302 to prevent lubricating oil from leaking backward through the gap between the throttling section 302 and the valve core 4.

[0023] The outer side of the anti-rust gasket 2 is provided with an oil injection hole 203 that communicates with the annular oil storage cavity 201, and a sealing plug 10 is provided inside the oil injection hole 203.

[0024] The top of the anti-rust washer 2 is coaxially provided with an integrally formed mounting protrusion ring 204. The inner wall of the mounting protrusion ring 204 is machined with an internal thread 205. The bottom of the nut body 1 is provided with an annular groove 101 that matches the mounting protrusion ring 204. The inner wall of the annular groove 101 is machined with an external thread 102 that matches the internal thread 205.

[0025] The above-described embodiments are merely illustrative of certain implementations of this utility model, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

[0026] It should be noted that the above content falls within the scope of the inventor's technical knowledge. Due to the vast and complex nature of the technical content in this field, the above content of this application does not necessarily constitute prior art.

Claims

1. A gasketed anti-seize nut characterized by: The nut body (1) includes a rust-proof washer (2) that can be detachably installed at its bottom. The rust-proof washer (2) has an annular oil reservoir (201) inside. Its inner sidewall has a guide hole (202) that communicates with the annular oil reservoir (201) along the radial direction. An oil injection pipe (3) is slidably assembled in the guide hole (202). The inner end of the oil injection pipe (3) protrudes slightly from the inner side of the rust-proof washer (2) and has a ball head structure. The outer end extends into the annular oil reservoir (201). The oil injection pipe (3) is provided with an expansion section (301) and a throttling section (302) from its inner end. The throttling section (302) is provided with an axially sliding valve core (4). One end of the valve core (4) is connected to a limit ring (5) fixed in the expansion section (301) by a return spring (6), and the other end is always in contact with the push rod (7) under the action of the return spring (6). The push rod (7) is fixedly installed on the inner wall of the annular oil storage chamber (201).

2. The anti-corrosion captive nut according to claim 1, wherein: The guide holes (202) are provided in multiple ways and are evenly distributed along the circumference of the anti-rust gasket (2).

3. The anti-corrosion captive nut according to claim 1, wherein: The outer wall of the oil injection pipe (3) is fixedly fitted with several equidistant first sealing rings (8), and the first sealing rings (8) form a sealing sliding fit with the inner wall of the guide hole (202).

4. The anti-corrosion captive nut according to claim 1, wherein: The outer wall of the valve core (4) is fixedly fitted with several equidistant second sealing rings (9), and the second sealing rings (9) form a sealing sliding fit with the inner wall of the throttling section (302).

5. The anti-corrosion captive nut according to claim 1, wherein: The rust-proof gasket (2) has an oil injection hole (203) on its outer side that communicates with the annular oil storage cavity (201), and a sealing plug (10) is provided in the oil injection hole (203).

6. A rust-proof nut with a washer according to claim 1, characterized in that: The top of the anti-rust washer (2) is coaxially provided with an integrally formed mounting protrusion (204), the inner wall of the mounting protrusion (204) is machined with an internal thread (205), and the bottom of the nut body (1) is provided with an annular groove (101) that is adapted to the mounting protrusion (204), and the inner wall of the annular groove (101) is machined with an external thread (102) that matches the internal thread (205).

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