CN215294069U

CN215294069U - Fastening device with limit structure

Info

Publication number: CN215294069U
Application number: CN202120599422.0U
Authority: CN
Inventors: 王洋; 盛野; 孙俊太; 赵崇石; 修显坤; 柴宗超
Original assignee: Qingdao Rototech Yili Automobile Plastic Product Co ltd; Wuxi Yili Environmental Protection Technology Co Ltd; Hebei Yili Technology Co Ltd
Current assignee: Qingdao Rototech Yili Automobile Plastic Product Co ltd; Wuxi Yili Environmental Protection Technology Co Ltd; Hebei Yili Technology Co Ltd
Priority date: 2021-03-24
Filing date: 2021-03-24
Publication date: 2021-12-24
Anticipated expiration: 2031-03-24

Abstract

The utility model belongs to the technical field of automobile parts, and relates to a fastening device with a limiting structure, which comprises a metal fastening piece, a sealing ring and a metal insert matched with the metal fastening piece; the metal fastener comprises a fastening column and a fastening nut, a limiting structure is arranged at the position where the metal fastener is connected with the metal insert, and the limiting structure is fixedly connected with the fastening nut; the diameter of the limiting structure is larger than the inner diameter of the metal insert, a sunken groove is formed at the position where the limiting structure is connected with the metal insert, and the sealing ring is arranged in the sunken groove. The utility model provides a fastener with limit structure, through metal fastener and the embedded cooperation structure between the metal mold insert in the product, especially limit structure can prevent the direct compression sealing washer of metal fastener to solve the problem that the sealing washer became invalid because of the too big elasticity that leads to of compression, thereby solved the weeping phenomenon that products such as seal box became invalid and take place because of the sealing washer, guaranteed the leakproofness of rotational moulding product.

Description

Fastening device with limit structure

Technical Field

The utility model belongs to the technical field of automobile parts, a fastener device is related to, concretely relates to fastener with limit structure.

Background

The metal fastener is a common mechanical basic part and is widely applied. The metal fastener is required to be used in the existing box products such as a plastic oil tank or a urea tank, and the sealing ring is adopted to statically seal the positions of the embedded metal insert of the box body and the metal fastener. In the existing structure, an insert is sunk on the surface of a product, a sealing ring is placed in a sinking groove, and the contact surface of a metal fastener and the sealing ring is slightly larger than the diameter of the sinking groove of the product; when the metal fastener is fastened, pressure is directly applied to the surface of a product and the sealing ring. The existing installation mode has the problems that when the installation torque of a metal fastener is too large, the fastener sinks to the surface of a product, the compression amount of a sealing ring is increased, and the compression amount of the sealing ring cannot be effectively controlled, so that the sealing ring is elastically ineffective, and leakage is caused due to the elastic ineffective of the sealing ring.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve the above-mentioned problem that exists among the prior art, provide a fastener with limit structure, through with the product in the mold insert structure cooperate, solve the too big problem of sealing washer compression, guarantee the leakproofness of rotational moulding product to sealed box such as current plastic oil tank or urea case has been solved because of the weeping phenomenon that the sealing washer became invalid and take place.

The technical scheme of the utility model is that:

a fastening device with a limiting structure comprises a metal fastener, a sealing ring and a metal insert matched with the metal fastener; the metal fastening piece comprises a fastening column and a fastening nut, a limiting structure is arranged at the position where the metal fastening piece is connected with the metal insert, and the limiting structure is fixedly connected with the fastening nut; the diameter of the limiting structure is larger than the inner diameter of the metal insert, a sunken groove is formed at the position where the limiting structure is connected with the metal insert, and the sealing ring is installed in the sunken groove.

Furthermore, the limiting structure is a limiting step, and the limiting step is connected with the metal fastener in a welding mode.

Further, the metal fastener is of an integrated structure.

Furthermore, the height of the limiting structure is the diameter of the sealing ring, and the compression amount of the sealing ring is reduced.

Further, the diameter of the fastening nut is larger than the outer diameter of the metal insert, and the outer diameter of the fastening column is the same as or slightly smaller than the inner diameter of the metal insert.

Further, the sealing ring is an O-shaped sealing ring.

Furthermore, the metal insert is arranged at a liquid suction and return port and a liquid discharge port of the sealed box body and sinks on the surface of the sealed box body.

Further, the metal fastener is any one of a liquid suction pipe or a liquid discharge bolt; the sealed box body is a plastic oil tank or a urea tank.

The utility model has the advantages that:

the utility model provides a fastener with limit structure, through metal fastener and the embedded cooperation structure between the metal mold insert in the product, especially through setting up limit structure, can prevent the direct compression sealing washer of metal fastener to solve the problem of the elasticity inefficacy that the sealing washer leads to because of the decrement is too big, thereby solved the weeping phenomenon that products such as seal box took place because of the sealing washer inefficacy, guaranteed the leakproofness of rotational moulding product.

Drawings

Fig. 1 is a structural cross-sectional view of a fastening device with a limiting structure provided by the present invention;

FIG. 2 is a schematic view of a liquid suction and return tube with a position limiting structure in an embodiment;

in the above figures, 1, a metal fastener; 11. fastening a nut; 12. a limiting structure; 13. fastening the column; 2. a metal insert; 3. a seal ring; 4. sinking the tank; 5. sucking the liquid return pipe.

Detailed Description

In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention, and in the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", and the like indicate the position or position relationship based on the position relationship shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but 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, and thus cannot be understood as limiting the present invention.

For a further understanding of the present invention, reference will be made to the following description taken in conjunction with the accompanying drawings and examples.

As shown in fig. 1, the present invention relates to a fastening device with a limiting structure 12, which comprises a metal fastening member 1, a sealing ring 3 and a metal insert 2 used in cooperation with the metal fastening member 1; the metal fastening piece 1 comprises a fastening column 13 and a fastening nut 11, a limiting structure 12 is arranged at the position where the metal fastening piece 1 is connected with the metal insert 2, and the limiting structure 12 is fixedly connected with the fastening nut 11; the diameter of the limiting structure 12 is larger than the inner diameter of the metal insert 2, a sunken groove 4 is formed at the position where the limiting structure 12 is connected with the metal insert 2, and the sealing ring 3 is installed in the sunken groove 4.

In the fastening device, the metal fastening piece 1 and the metal insert 2 embedded in the product are matched, and particularly the limiting structure 12 is arranged, so that the metal fastening piece 1 can be prevented from directly compressing the sealing ring 3, the problem that the sealing ring 3 fails due to elasticity caused by overlarge compression amount is solved, the liquid leakage phenomenon of products such as a sealing box body due to failure of the sealing ring 3 is solved, and the sealing performance of the rotational molding product is ensured.

In this embodiment, the limiting structure 12 on the metal fastening member 1 is a limiting step, and the limiting step is connected with the metal fastening member 1 by welding. When the metal fastening member 1 is installed in cooperation with the metal insert 2, because the diameter of the fastening nut 11 is greater than the outer diameter of the metal insert 2, and the outer diameter of the fastening column 13 is the same as or slightly smaller than the inner diameter of the metal insert 2, the limiting step is just installed at the upper end of the metal insert 2, a sunken groove 4 is formed between the limiting step and the metal insert 2, the sunken groove is a groove with an open side, and the sealing ring 3 is arranged in the sunken groove. The height of the limiting step is the diameter of the sealing ring 3 minus the compression amount of the sealing ring, and the minus compression amount can be set to be 20% -30% of the compression amount; therefore, the sealing ring 3 can be ensured to play a sufficient sealing role, and meanwhile, the sealing ring 3 cannot be excessively compressed due to the structural fixation of the formed sinking groove 4, and the elasticity of the sealing ring 3 is ensured.

When the metal fastening piece 1 is screwed, the limiting structure 12 of the metal fastening piece 1 is contacted with the sealing ring 3, the sealing ring 3 is also contacted with the metal insert 2, the fastening nut 11 and the side face of the product and plays a role in sealing, and the compression amount of the sealing ring 3 is controlled by the limiting structure 12 of the metal fastening piece 1 being contacted and limited with the metal insert 2 in a matching way.

It can be understood that the fastening column 13, the position limiting structure 12 and the fastening nut 11 of the metal fastening member 1 are fixedly connected together, so that the metal fastening member 1 is of an integral structure. The structure of the metal fastener 1 can be an integral structure formed by joining multiple parts in a seamless mode, and can also be an integral structure as long as the metal fastener can play a role in fastening and sealing.

In a specific embodiment, as shown in fig. 2, the metal fastening member 1 is a liquid suction pipe 5, a fastening nut 11 and a limiting step are arranged on the liquid suction pipe 5, and the embedded metal insert 2 is arranged on a liquid suction port and a liquid discharge port of the sealed box body and sinks on the surface of the rotational molding box body. The sealing ring 3 adopted in the device is an O-shaped sealing ring, the O-shaped sealing ring is 20% -30% higher than the surface of a product, the O-shaped sealing ring is arranged at the upper end of a metal insert 2, a limiting step is arranged at the position where a liquid suction and return pipe 5 is in contact with the O-shaped sealing ring and the metal insert 2, and the step height is the diameter of the O-shaped sealing ring to reduce the compression amount of the O-shaped sealing ring. When the liquid suction and return pipe 5 is inserted into a liquid suction and return port of the sealing box body and screwed, the limiting step is clamped at the upper end of the metal insert 2, a groove with fixed height is formed between the limiting step and the metal insert 2, the O-shaped sealing ring is limited in the groove, the compression amount of the O-shaped sealing ring is fixed and is not excessively compressed, the O-shaped sealing ring is also contacted with the side face of a product, the insert and the fastening nut 11, and the sealing effect is achieved under the synergistic effect.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or amendment made without departing from the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A fastening device with a limiting structure is characterized by comprising a metal fastener, a sealing ring and a metal insert matched with the metal fastener; the metal fastening piece comprises a fastening column and a fastening nut, a limiting structure is arranged at the position where the metal fastening piece is connected with the metal insert, and the limiting structure is fixedly connected with the fastening nut; the diameter of the limiting structure is larger than the inner diameter of the metal insert, a sunken groove is formed at the position where the limiting structure is connected with the metal insert, and the sealing ring is installed in the sunken groove.

2. The fastening device with the limiting structure as claimed in claim 1, wherein the limiting structure is a limiting step, and the limiting step is welded with the metal fastening member.

3. A fastening device with a limit formation as claimed in claim 1, wherein the metal fastener is of unitary construction.

4. A fastening device with a stop formation according to claim 1, wherein the height of the stop formation is the diameter of the sealing ring minus its compression.

5. The fastening device with the limit structure of claim 1, wherein the fastening nut has a diameter larger than an outer diameter of the metal insert, and the outer diameter of the fastening column is the same as or slightly smaller than an inner diameter of the metal insert.

6. The fastening device with a limit stop feature of claim 1, wherein the seal is an O-ring seal.

7. The fastening device with the limiting structure according to claim 1, wherein the metal insert is disposed at a liquid suction port and a liquid discharge port of the sealed box body and is sunk to the surface of the sealed box body.

8. The fastening device with the limit structure as claimed in claim 7, wherein the metal fastener is any one of a liquid suction pipe or a liquid discharge bolt; the sealed box body is a plastic oil tank or a urea tank.