Corrosion-resistant fastener

Abstract

The utility model relates to a corrosion-resistant fastener which comprises a screw rod, the screw rod comprises a rod portion and a head portion, a sealing gasket is sleeved on the rod portion, the outer diameter of the sealing gasket is larger than that of the head portion, a protective cover is detachably arranged on the head portion, the protective cover extends downwards to form a sealing ring, the sealing gasket is sleeved in the sealing ring, and the sealing gasket is sleeved in the sealing ring. The structure can be used for sealing joints between the head part and a fastened part and between the rod part and the fastened part, the head part and the rod part can be prevented from being exposed to the outside, and then the problems of rusting or corrosion and the like of the head part and the rod part are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of fasteners, in particular to a corrosion-resistant fastener. Background Art

[0002] Fasteners are a type of mechanical parts used for fastening and connection and are extremely widely used. They are the general term for a type of mechanical parts used to fasten two or more parts into a whole.

[0003] In actual use, people usually use screws as fasteners for connection. However, after the connection is completed, the head of the screw or screw is usually exposed to the outside of the object. After long-term use, it is prone to rust or corrosion and wear, making the fastener difficult to rotate again or the fastener loose. Utility Model Content

[0004] The utility model provides a composite stainless steel pipe resistant to external force impact, which solves the above problems existing in the use process of the prior art.

[0005] The technical solution of the utility model is achieved as follows: a corrosion-resistant fastener includes a screw, the screw includes a rod and a head, a sealing gasket is sleeved on the rod, the outer diameter of the sealing gasket is larger than the outer diameter of the head, a protective cover is detachably provided on the head, a sealing ring is extended downward from the protective cover, the sealing gasket is sleeved in the sealing ring, and an extrusion assembly is provided on the outside of the sealing ring.

[0006] The utility model is further configured as follows: the extrusion assembly includes an inverted conical sleeve, the inverted conical sleeve is arranged on the outside of the sealing ring, the inner side wall of the inverted conical sleeve is used to squeeze the outer side wall of the sealing ring, and the lower end of the inverted conical sleeve is provided with an annular pressure plate, and the pressure plate is arranged to abut the lower end of the sealing ring.

[0007] The utility model is further configured such that the inner side wall of the pressing plate abuts against the outer side wall of the sealing gasket.

[0008] The utility model is further configured as follows: a gasket is provided on the rod, the gasket is located between the head and the sealing gasket, a limiting tube is provided at the lower end of the gasket, the limiting tube is sleeved in the sealing gasket, and the inner diameter of the sealing gasket and the inner diameter of the limiting tube are both larger than the diameter of the rod.

[0009] The present invention is further configured as follows: a plurality of sealing rings are fixedly provided on the inner side of the sealing ring, the sealing rings are arranged in sequence from top to bottom, and the sealing rings are used to abut against the outer side wall of the sealing gasket.

[0010] The utility model is further configured as follows: a threaded section is provided on the outer side wall of the upper end of the head; a mounting cover is fixedly connected to the inside of the protective cover; and the mounting cover is connected to the head through threaded engagement.

[0011] The utility model is further configured as follows: a first chamfer is provided at the connection between the head and the rod, and a second chamfer is provided between the inner side wall and the upper end surface of the washer.

[0012] In summary, the beneficial effects of the present invention are:

[0013] 1. This structure can be used to seal the joints between the head and the stem and the fastener, which can prevent the head and the stem from being exposed to the outside world, thereby avoiding problems such as rust or corrosion on the head and the stem.

[0014] 2. The inverted cone sleeve is used to tighten the sealing ring on the outer surface of the sealing gasket, so that the sealing ring is pressed against the sealing gasket to achieve a sealing effect.

[0015] 3. There are multiple sealing rings arranged from top to bottom to further improve the sealing effect.

[0016] 4. The limit tube, the first chamfer and the second chamfer can play a role in correcting the deviation, so that the screw can be kept roughly coaxial with the washer and the sealing gasket during installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 for Figure 1 A local enlarged schematic diagram of point A in the middle.

[0020] Reference numerals in the figure: 1 head, 11 threaded segment, 2 rod, 21 washer, 211 limiting tube, 22 first chamfer, 23 second chamfer, 31 protective cover, 32 mounting cover, 33 sealing ring, 34 sealing ring, 35 inverted tapered sleeve, 36 pressure plate, 37 sealing gasket, 4 fastener. DETAILED DESCRIPTION

[0021] The following is a combination of the appended examples of the present invention Figure 1-2, clearly and completely describes the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0022] Example:

[0023] like Figures 1 to 2 As shown, the utility model discloses a corrosion-resistant fastener, comprising a screw rod, wherein the screw rod comprises a rod portion 2 and a head portion 1.

[0024] The outer side of the rod 2 is sequentially provided with an annular gasket 21 and an annular sealing gasket 37 from top to bottom, wherein a second chamfer 23 is provided between the inner side wall and the upper end face of the gasket 21, and correspondingly, a first chamfer 22 is provided at the connection between the head 1 and the rod 2. At the same time, a limiting tube 211 is provided at the lower end of the gasket 21, and the sealing gasket 37 is sleeved on the outer side of the limiting tube 211. In this structure, the inner diameter of the sealing gasket 37 and the inner diameter of the limiting tube 211 are both larger than the diameter of the rod 2. In addition, the outer diameter of the sealing gasket 37 is larger than the outer diameter of the head 1.

[0025] A protective cover 31 is detachably provided on the head 1 , and a sealing ring 33 is extended downward from the protective cover 31 . In this structure, a sealing gasket 37 is sleeved in the sealing ring 33 , and an extrusion assembly is provided on the outside of the sealing ring 33 .

[0026] The extrusion assembly specifically includes an inverted conical sleeve 35, which is sleeved on the outside of the sealing ring 33, and the inner wall of the inverted conical sleeve 35 is used to squeeze the outer wall of the sealing ring 33. In addition, the lower end of the inverted conical sleeve 35 is integrally formed with an annular pressure plate 36, which is sleeved on the outside of the sealing gasket 37, and the inner wall of the pressure plate 36 is abutted against the outer wall of the sealing gasket 37.

[0027] A plurality of sealing rings 34 are fixedly provided on the inner side of the sealing ring 33 . The sealing rings 34 are arranged in sequence from top to bottom. The sealing rings 34 are used to abut against the outer side wall of the sealing gasket 37 .

[0028] A threaded section 11 is provided on the outer side wall of the upper end of the head 1 , and a mounting cover 32 is fixedly connected to the interior of the protective cover 31 , and the mounting cover 32 is connected to the head 1 through threaded engagement.

[0029] The working principle of the above structure is as follows: when the fastener needs to be installed, the sealing gasket 37 and the washer 21 are first put on the rod 2, and then the screw is installed on the fastened part 4. At this time, the head 1 gradually moves downward and presses the washer 21 and the sealing gasket 37 on the surface of the fastened part 4. At this time, the sealing ring 34 can prevent impurities such as acid and alkali liquids, sewage, etc. from penetrating into the rod 2 from between the sealing gasket 37 and the fastened part 4.

[0030] Then put the conical sleeve on the outside of the sealing gasket 37, and then thread the protective cover 31 onto the head 1. At this time, the pressure plate 36 is held between the sealing ring 33 and the fastener 4, and the inverted conical sleeve 35 tightens the sealing ring 33 on the outer wall of the sealing gasket 37, thereby preventing impurities from entering the protective cover 31 from between the sealing ring 33 and the sealing gasket 37. At this time, the connection between the rod 2 and the fastener 4 and the head 1 are isolated from the outside world.

[0031] In addition, during this process, since the first chamfer 22 and the second chamfer 23 are provided, the screw will be aligned with the gasket 21 during the installation process and be coaxially installed on the fastener 4. At the same time, since the limiting tube 211 always limits the sealing gasket 37, the sealing gasket 37 is also aligned with the position of the screw. Therefore, when the protective cover 31 is connected, the sealing ring 33 can form a relatively uniform sealing effect on the periphery of the sealing gasket 37.

[0032] It should also be pointed out that the terms indicated in the present invention, such as: "front", "rear", "vertical", "horizontal", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as limiting the scope of protection of the present invention.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A corrosion-resistant fastener, comprising a screw, wherein the screw comprises a stem (2) and a head (1), characterized in that: A sealing gasket (37) is sleeved on the rod portion (2), and the outer diameter of the sealing gasket (37) is larger than the outer diameter of the head portion (1). A protective cover (31) is detachably provided on the head portion (1), and a sealing ring (33) is extended downward from the protective cover (31). The sealing gasket (37) is sleeved inside the sealing ring (33), and an extrusion assembly is provided on the outside of the sealing ring (33).

2. The corrosion-resistant fastener according to claim 1, characterized in that: The extrusion assembly includes an inverted conical sleeve (35), which is sleeved on the outside of the sealing ring (33), and the inner side wall of the inverted conical sleeve (35) is used to squeeze the outer side wall of the sealing ring (33). The lower end of the inverted conical sleeve (35) is provided with an annular pressing plate (36), and the pressing plate (36) is arranged to abut against the lower end of the sealing ring (33).

3. The corrosion-resistant fastener according to claim 2, characterized in that: The inner side wall of the pressing plate (36) abuts against the outer side wall of the sealing gasket (37).

4. The corrosion-resistant fastener according to claim 3, characterized in that: A washer (21) is provided on the rod (2), and the washer (21) is located between the head (1) and the sealing gasket (37). A limiting tube (211) is provided at the lower end of the washer (21), and the limiting tube (211) is sleeved in the sealing gasket (37). The inner diameters of the sealing gasket (37) and the limiting tube (211) are both larger than the diameter of the rod (2).

5. The corrosion-resistant fastener according to claim 4, characterized in that: A plurality of sealing rings (34) are fixedly provided on the inner side of the sealing ring (33), and the sealing rings (34) are arranged in sequence from top to bottom. The sealing rings (34) are used to abut against the outer side wall of the sealing gasket (37).

6. The corrosion-resistant fastener according to claim 1, characterized in that: A threaded section (11) is provided on the outer side wall of the upper end of the head (1), and a mounting cover (32) is fixedly connected to the interior of the protective cover (31), and the mounting cover (32) is connected to the head (1) through threaded engagement.

7. The corrosion-resistant fastener according to claim 4, characterized in that: A first chamfer (22) is provided at the connection between the head (1) and the stem (2), and a second chamfer (23) is provided between the inner side wall and the upper end surface of the washer (21).

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