CN103939447A - Double-seal bolt - Google Patents

Abstract

The invention provides a double sealing bolt, which includes a bolt, a sealing ring, a washer and a nut. The principle of the double-sealed bolt is: there is a groove on the bolt, which is used to place the sealing ring to form an inner seal; a gasket is placed at both ends of the bolt, and the inner diameter of the gasket is tightly attached to the bolt with the groove. The external seal is formed under the action of force, which can effectively prevent the external fluid from entering the inside of the bolt, and can effectively prevent the fluid inside the container from flowing out. The invention has the advantages of novel structure, simple operation, easy manufacture and compact structure, and is suitable for bolt connection of pressure vessels. In addition, the invention also discloses the use method of double sealing bolts.

Description

A double sealing bolt

technical field

The invention specifically relates to a double-sealed bolt structure that can be used to prevent gas leakage in a pressure vessel.

Background technique

Bolt connection is one of the most commonly used mechanical connection methods, and now there are different bolt types and different bolt connection structures. In order to prevent external impurities and internal fluid from seeping and leaking from the bolt connection, people have invented a series of exquisite ways to seal the bolt. For example, the gasket can effectively prevent the leakage of the joint surface between the bolt and the test piece and the nut; the sealing of the thread can be realized by sealant; the sealing ring is installed on the thread to realize the anti-loosening and sealing of the thread.

At present, there are many structures and methods for bolt sealing, but the main bolt sealing methods and structures have the following disadvantages: the sealing method is single, and double sealing cannot be achieved; In some cases, the sealing effect is not good; the use of sealant and sealing ring at the thread position makes it difficult to disassemble and assemble the bolts.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a double sealing bolt structure and its application method.

The solution of the present invention is: the double sealing bolt includes a nut, a gasket, a sealing ring and a bolt. There are multiple groups of grooves on the bolts, and the sealing ring is installed in the grooves of the bolts to form an inner seal. Gaskets are placed at both ends of the bolt, and the outer seal is formed by the compression force of the tightened nut.

The bolt includes a screw and a threaded part. The screw and the threaded part are connected front and back. The threaded part is located at the end of the bolt and is used to connect the nut. Multiple sets of grooves can be set on the screw, on the threaded part, or partly on the screw. , and the other part is set on the threaded part to install the sealing ring.

The number of groups of grooves and the number of grooves in each group of grooves can be increased or decreased according to sealing requirements. The inner diameter of the gasket is smaller than the outer diameter of the bolt, and it fits tightly with the bolt. There is a slope on the inner diameter of the gasket, which is convenient for gasket installation.

The invention also discloses a method for using the above-mentioned double-sealed bolts. The method is used for sealing the pressure chamber. The pressure chamber includes a casing composed of a plurality of casing parts. The casing parts have through holes for installing the double-sealed bolts. The multiple casings The sections are fastened together by double seal bolts, the steps of the method include:

Insert the first washer into one end of the bolt;

Put the sealing ring into the corresponding groove;

adjusting the plurality of housing parts so that the through-holes of the respective housing parts to be fastened together are aligned with each other;

Insert the bolts from the other end of the bolts into the through holes of the shell parts that are aligned with each other, so that multiple sets of grooves and corresponding sealing rings are located at both ends of the pressure chamber, wherein the sealing rings are in close contact with the walls of the through holes to form an inner seal ;

Insert the second washer into the other end of the bolt passing through the through hole of the housing part;

Install and tighten the nut so that the gasket presses against the housing part to form an outer seal.

It may include a plurality of pressure chambers, and there is at least one set of grooves and corresponding sealing rings between each two pressure chambers.

The double sealing bolt of the present invention has the following significant advantages:

1) The present invention contains double seals, the sealing ring forms an inner seal, and the gasket forms an outer seal;

2) There is a groove at the position of the bolt of the present invention, which is used to place the sealing ring, and the number of the groove can be expanded according to the sealing requirements;

3) The inner diameter of the gasket of the present invention is smaller than the outer diameter of the bolt, and it fits tightly with the bolt, and the inner diameter of the gasket has a slope to facilitate the installation of the gasket;

4) The present invention has compact structure, strong versatility, and easy processing and assembly, and is suitable for bolted connections of pressure vessels with higher sealing requirements.

Description of drawings

The accompanying drawings illustrate embodiments of the present invention, and it should be noted that the accompanying drawings are only used to illustrate the principles of the present invention, not to limit the scope thereof, and are not necessarily drawn to scale.

The present invention will be further described below in conjunction with accompanying drawings and examples.

Fig. 1 is a cross-sectional view of the double sealing bolt structure of the present invention:

In the figure: 1 nut; 2 gasket; 3 sealing ring; 4 bolt; 5 threaded part; 6 screw rod; 7 groove.

Detailed ways

The structural principle and working principle of the present invention will be further described in detail below in conjunction with the accompanying drawings.

It should be noted that the embodiments in the present invention are only for illustrating technical principles, and are not intended to limit the scope of the present invention. Without departing from the spirit and scope of the present invention, those skilled in the art will recognize various modifications and changes of the present invention by reading the present invention, and these modifications and changes are also within the protection scope of the present application.

Referring to Fig. 1, the present invention provides a double sealing bolt for sealing a pressure chamber. The pressure chamber includes a housing made up of a plurality of housing parts having through holes for mounting double sealing bolts, the plurality of housing parts being fastened together by the double sealing bolts to form a double sealed pressure chamber. Double sealing bolts include bolt 4, sealing ring 3, gasket 2 and nut 1. The bolt 4 includes a screw rod 6 and a threaded portion 5 , and the screw rod 6 and the threaded portion 5 are connected front and rear. The threaded part 5 is located at the end of the bolt 4 and is used for connecting the nut. There are 2 sets of grooves on the screw 6, and each set of grooves includes 3 grooves 7, and a sealing ring 3 is placed in the groove 7, and the sealing ring 3 is closely connected with the bolt 4 and the through-hole wall of the shell part to form an inner seal . A pressure cavity is sealed between the two sets of grooves and the corresponding sealing rings. Place the gasket 2 at both ends of the bolt 4, the inner diameter of the gasket 2 is smaller than the outer diameter of the bolt 4 with the groove, and there is a slope at the inner diameter of the gasket 2, which is convenient for the installation of the gasket 2. The inner diameter of the gasket 2 and the outer diameter of the bolt 4 are tightly fitted together, and the nut 1 is tightened so that the gasket 2 is tightly pressed against the shell part to form an outer seal, which can effectively prevent external substances from entering the interior of the bolt, and also prevent the bolt from The internal fluid leakage of the connection is suitable for pressure vessels with high sealing requirements.

In addition, only 2 groups of grooves are disclosed in Fig. 1, and each group of grooves includes a technical solution of 3 grooves. According to needs, it may include multiple groups of grooves (such as three groups, four groups, etc.), each group of grooves One or more grooves may be included, and more than one seal ring may be placed in each groove. In addition, in this technical solution, multiple groups of grooves can be provided on the screw rod, and a pressure chamber is sealed between every two grooves, so that multiple pressure chambers can be sealed with one bolt. According to different sealing needs, the number of grooves and sealing rings on both sides of the pressure chamber can be different, for example, there are two sets of grooves on one side of the pressure chamber and one set of grooves on the other side. And the groove is not necessarily arranged on the screw rod 6 , it can also be arranged on the threaded part 5 , or a part of the grooves can be arranged on the screw rod 6 and another part of the groove can be arranged on the threaded part 5 .

Furthermore, the invention also relates to a method for using the above-mentioned double sealing bolt for sealing a pressure chamber, the pressure chamber comprising a housing made up of a plurality of housing parts having through holes for mounting the double sealing bolt, the plurality of The housing parts are fastened together by double seal bolts, the steps of the method comprising:

Insert the first gasket 2 into one end of the bolt 4;

Put the sealing ring 3 into the corresponding groove 7;

adjusting the plurality of housing parts so that the through-holes of the respective housing parts to be fastened together are aligned with each other;

From the other end of the bolt 4, insert the bolt 4 into the through holes of the shell parts that are aligned with each other, so that the groove 7 and the corresponding sealing ring 3 are located at both ends of the pressure chamber, wherein the sealing ring 3 is in close contact with the through hole wall, forming inner seal;

Insert the second gasket 2 into the other end of the bolt 4 passing through the through hole of the shell part;

Install and tighten the nuts so that the gasket 2 is pressed against the housing part to form an outer seal.

Claims (7)

1. a double seal bolt, it is characterized in that: described double seal bolt comprises nut (1), pad (2), seal ring (3) and bolt (4), on bolt (4), have many group grooves (7), seal ring (3) is installed in the groove (7) of bolt (4), is used to form interior sealing; The two ends of bolt (4) are placed with pad (2), by the impacting force formation external sealed of fastening nut (1).

2. double seal bolt according to claim 1, it is characterized in that: described bolt (4) comprises screw rod (6) and screw section (5), screw rod (6) joins with front and back, screw section (5), screw section (5) is positioned at the end of bolt (4), for attaching nut, the groove of group more than described can be arranged on screw rod (6), be arranged on screw section (5), or a part is arranged on screw rod (6), it is upper that another part is arranged at screw section (5), is used for installing seal ring (3).

3. according to double seal bolt described in claim 1 or 2, it is characterized in that: preferred, the group number of groove and the quantity of every group of groove further groove can increase and decrease according to seal request.

4. according to double seal bolt described in claim 1 or 2, it is characterized in that: described pad (2) internal diameter is less than bolt (4) external diameter, tightly fit together with bolt (4).

5. according to double seal bolt described in claim 1 or 2, it is characterized in that: pad (2) inner radius has slope, facilitate pad (2) to install.

6. the using method of the double seal bolt described in a claim 1-5, described method is for sealing load chamber, pressure chamber comprises the shell consisting of a plurality of housing parts, housing parts has through hole, for construction bolt, by double seal bolton together, the step of the method comprises the plurality of housing parts:

The first pad (2) is inserted in to the one end in bolt (4);

Seal ring (3) is put into corresponding groove (7);

Adjust described a plurality of housing parts, the through hole of the corresponding housing parts that tighten together is aimed at mutually;

From the other end of bolt (4), bolt (4) is inserted into the through hole of housing parts of mutual aligning, make many group grooves (7) and corresponding seal ring (3) be positioned at the two ends of pressure chamber, wherein seal ring (3) and through-hole wall close contact, seal in forming;

The second pad (2) is inserted in to the other end of the bolt (4) passing from the through hole of housing parts;

Install and fastening nut (1), pad (2) is pressed on housing parts, form external sealed.

7. according to the method for claim 6, it is characterized in that: can comprise a plurality of pressure chambers, between every two pressure chambers, at least there is one group of groove (7) and corresponding seal ring (3).