CN206478097U - A kind of nut - Google Patents

Abstract

The utility model discloses a nut, which comprises a nut body. A threaded hole is arranged axially inside the nut body. The shape of the nut body is cylindrical. One end of the nut body is closed. A side column, the regular hexagonal column is coaxial with the nut body, and the side length of the regular hexagonal column is smaller than the cross-sectional radius of the nut body. One end of the nut body is closed to prevent air from entering between the nut and the stud, thereby preventing the nut and the stud from rusting, reducing the corrosion of the stud, and prolonging the service life of the bolt. When the nut is used to connect the flange, the overall quality of the flange can also be reduced.

Description

a nut

technical field

The utility model relates to a fastener, in particular to a nut.

Background technique

Flange connections on high-pressure and ultra-high-pressure vessels are usually connected by large hexagonal stud bolts. Since the bolts are exposed to the air for a long time, they will rust over time, causing the studs and nuts to rust and cannot be disassembled; and in practice It is also found that due to the large number of bolts distributed on the flange and the large size of the bolts, the distance between the nuts of adjacent bolts is small, and when tightening, the operation space is small and the operation is inconvenient. In order to meet the tightening operation of the nuts, adjacent The distance between the two nuts must meet the operating requirements of the tightening tool. Therefore, the actual diameter of the center circle of the bolt hole on the flange is often larger than the theoretical diameter. After the actual diameter increases, due to the torque change from the bolt hole to the flange center , leading to an increase in the thickness of the flange and the outer diameter of the flange, which eventually leads to a substantial increase in the overall quality of the flange.

Utility model content

The technical problem to be solved by the utility model is to provide a nut that can prevent the stud and the nut from rusting and can reduce the overall quality of the flange.

In order to solve the above-mentioned technical problems, the technical solution adopted by the utility model is: a nut, including a nut body, the inside of the nut body is axially provided with a threaded hole, the shape of the nut body is cylindrical, one end of the nut body is closed, and the nut body is The closed end of the body is provided with an axially extending regular hexagonal post, the regular hexagonal post is coaxial with the nut body, and the side length of the regular hexagonal post is smaller than the cross-sectional radius of the nut body.

As a preferred solution, the depth of the threaded hole is smaller than the height of the nut body.

As a preferred solution, a blind hole communicated with the threaded hole is arranged axially inside the regular hexagonal column, the blind hole is coaxial with the threaded hole, and the diameter of the blind hole is smaller than the diameter of the threaded hole.

As a preferred solution, an anti-collision hole is also arranged axially in the nut body, the anti-collision hole is located between the blind hole and the threaded hole and the three are connected to each other, the anti-collision hole and the threaded hole are coaxial, and the anti-collision hole The diameter of the hole is larger than the threaded hole.

As a preferred solution, a spherical protrusion is provided on the bottom surface of the threaded hole.

The beneficial effect of the utility model is: one end of the nut body is closed, which can prevent air from entering between the nut and the stud, thereby preventing the nut and the stud from rusting, reducing the corrosion of the stud, and prolonging the service life of the bolt. Under the premise of the minimum wall thickness of the nut body, the shape of the nut body is set to be cylindrical. Compared with the large hexagonal nut of the same specification, the outer diameter of the rotation is reduced, thereby expanding the distance between two adjacent nuts; When the force is applied to the regular hexagonal column, since the side length of the regular hexagonal column is smaller than the cross-sectional radius of the nut body, the distance between the regular hexagonal columns on two adjacent nuts is larger, providing enough space for screwing the nut. Therefore, compared with the traditional large hexagonal nut, using the nut described in the utility model can reduce the size of the center circle of the bolt hole on the flange, thereby reducing the outer diameter and thickness of the flange, and finally realizing The substantial drop in the quality of flanges reduces manufacturing costs for companies.

Description of drawings

Fig. 1 is a schematic diagram of the half-section structure of the first embodiment of the utility model;

Fig. 2 is the top view of the utility model;

Fig. 3 is a schematic diagram of the half-section structure of the second specific embodiment of the utility model;

Fig. 4 is a schematic diagram of an assembly structure using a traditional large hex nut to connect a flange;

Fig. 5 is a schematic diagram of the assembled structure of the flange connected by the nut described in the present invention.

In Figures 1 to 5: 1. Nut body, 2. Threaded hole, 3. Regular hexagonal column, 4. Blind hole, 5. Anti-collision hole, 6. Spherical protrusion, 7. Flange cover, 8. Large Hex nuts.

detailed description

Below in conjunction with accompanying drawing, describe the specific embodiment of the utility model in detail.

As shown in Fig. 1 and Fig. 2, it is the first specific embodiment of a kind of nut described in the utility model, comprising a nut body 1, and the inside of the nut body 1 is axially provided with a threaded hole 2, and the shape of the nut body 1 is Cylindrical, one end of the nut body 1 is closed, and the closed end of the nut body 1 is provided with an axially extending regular hexagonal column 3, the regular hexagonal column 3 is coaxial with the nut body 1, and the side length of the regular hexagonal column 3 is smaller than that of the nut Radius of the cross section of body 1.

One end of the nut body 1 is closed to prevent air from entering between the nut and the stud, thereby preventing the nut and the stud from rusting, reducing the corrosion of the stud, and prolonging the service life of the bolt; in addition, without changing the minimum wall thickness of the nut body 1 Under the premise, the shape of the nut body 1 is set to be cylindrical. Compared with the large hexagonal nut 8 of the same specification, the outer diameter of the rotation is reduced without changing the mechanical properties of the nut, thereby expanding the distance between two adjacent nuts. secondly, when the nut is turned, a force is applied to the regular hexagonal column 3, because the side length of the regular hexagonal column 3 is less than the cross-sectional radius of the nut body 1, therefore, the regular hexagonal column 3 on two adjacent nuts The distance between the nuts is larger, which provides enough operating space for screwing the nuts. Therefore, compared with the traditional large hexagonal nuts 8, the nuts described in the utility model are used to connect the flanges, and the size of the center circle of the bolt holes on the flanges is smaller. The outer diameter and thickness of the flange are relatively reduced, which finally reduces the total quality of the flange and reduces the manufacturing cost for the enterprise.

The depth of the threaded hole 2 is smaller than the height of the nut body 1 , which improves the connection strength between the regular hexagonal column 3 and the nut body 1 .

A blind hole 4 communicating with the threaded hole 2 is axially arranged inside the regular hexagonal column 3, the blind hole 4 is coaxial with the threaded hole 2, the diameter of the blind hole 4 is smaller than the diameter of the threaded hole 2, and the nut body 1 is also axially provided with an anti-collision hole 5, the anti-collision hole 5 is located between the blind hole 4 and the threaded hole 2 and the three are connected to each other, the anti-collision hole 5 is coaxial with the threaded hole 2, the diameter of the anti-collision hole 5 larger than threaded hole 2.

When in use, a thimble that can be inserted into the blind hole 4 and whose length is greater than the depth of the blind hole 4 is set at the corresponding stud end, which can prevent the end of the stud from being squeezed from the bottom surface of the threaded hole 2, thereby preventing the thread at the end of the stud from being squeezed. The damage prevents the nut from being removed from the stud smoothly.

If the length of the thimble is set to be greater than the depth of the blind hole 4 but less than the sum of the depth of the blind hole 4 and the anti-collision hole 5, then, when the nut is tightened, the stud end is located in the anti-collision hole 5, and the nut The number of threads connected to the stud is the largest, and after the force on the nut is divided equally on each thread, the force on each thread is the smallest, thereby prolonging the service life of the nut and the stud.

As shown in Figure 3 is the second specific embodiment of the present utility model, as can be seen from the figure, the difference between this specific embodiment and the first specific embodiment is that the second specific embodiment is not provided with blind holes 4 and anti-collision holes 5. Instead, a spherical protrusion 6 is set on the bottom surface of the threaded hole 2. After the anti-collision hole 5 is removed, the depth of the threaded hole 2 is correspondingly deepened, thereby ensuring the number of threads connected between the nut and the stud. The spherical protrusion 5 can be connected with The end faces of the studs are opposed to prevent the threads at the ends of the studs from being pressed against the bottom surface of the threaded hole 2, thereby protecting the threads at the ends of the studs.

Fig. 4 and Fig. 5 are respectively the structural representations of utilizing the large hexagonal nut 8 to connect the flange and utilizing the nut according to the present invention to connect the flange, the flange in Fig. 4 and Fig. 5 is a flange cover 7, wherein Fig. 4 The dimensions of the shown flange cover 7 and bolts are shown in Table 1:

Table 1:

The dimensions of the flange cover 7 shown in Figure 5 and the bolts are shown in Table 2:

Table 2:

Through the comparison of Table 1 and Table 2, it is obvious that after replacing the nuts, the outer diameter of the flange cover 7 is reduced by 60mm, the thickness of the flange is reduced by 15mm, and the overall mass is reduced by 227.7kg, so the conclusion can be obtained. The nut described in the utility model can reduce the overall quality of the flange.

The working principle of the utility model is: by setting a regular hexagonal column 3 with a diagonal diameter smaller than the diameter of the nut body on the nut body 1, when the nut is twisted, the active force acts on the regular hexagonal column 3, thereby increasing the The distance between the regular hexagonal columns 3 on two adjacent nuts, on the basis of ensuring the minimum operating distance, makes the arrangement of the bolts on the flange closer to the center of the flange, so as to reduce the distance from the center of the flange to the bolts, thereby Reduce the torque on the flange. On the basis of the reduced torque of the flange, the deformation of the flange is reduced, so the outer diameter and plate thickness of the flange can be reduced accordingly, thereby reducing the total quality of the flange.

Claims (5)

1. a nut, comprising a nut body (1), the inside of the nut body (1) is axially provided with a threaded hole (2), it is characterized in that, the profile of the nut body (1) is cylindrical, and the nut body (1) ) is closed at one end, and the closed end of the nut body (1) is provided with an axially extending regular hexagonal post (3). The regular hexagonal post (3) is coaxial with the nut body (1), and the regular hexagonal post (3) The side length is less than the cross-sectional radius of the nut body (1). 2. A nut according to claim 1, characterized in that, the depth of the threaded hole (2) is smaller than the height of the nut body (1). 3. A kind of nut according to claim 2, characterized in that, a blind hole (4) communicated with the threaded hole (2) is arranged axially inside the regular hexagonal column (3), and the blind hole ( 4) It is coaxial with the threaded hole (2), and the diameter of the blind hole (4) is smaller than the diameter of the threaded hole (2). 4. A nut according to claim 3, characterized in that an anti-collision hole (5) is axially arranged in the nut body (1), and the anti-collision hole (5) is located in the blind hole (4) And between the threaded hole (2) and the three communicate with each other, the anti-collision hole (5) is coaxial with the threaded hole (2), and the diameter of the anti-collision hole (5) is greater than the threaded hole (2). 5. A nut according to claim 2, characterized in that a spherical protrusion (6) is provided on the bottom surface of the threaded hole (2).