Flange connecting structure with high sealing performance

Abstract

The utility model discloses a flange connection structure with high sealing performance, which comprises a first flange, a second flange, a sealing gasket, a bolt and a nut, the sealing gasket is clamped between the first flange and the second flange, and the surfaces of the first flange and the second flange, which are attached to the sealing gasket, form butt joint surfaces. Locking surfaces are formed on the surfaces of opposite butt joint surfaces of the first flange and the second flange, mounting holes for bolts to penetrate through are formed in the first flange and the second flange, accommodating grooves communicated with the mounting holes are formed in the locking surfaces, sealing columns are mounted in the accommodating grooves, pressing columns are slidably mounted in notches of the accommodating grooves, the bolts penetrate through the sealing columns and the pressing columns, and the bolts penetrate through the sealing columns and the pressing columns. The sealing column elastically abuts against the pressing column. According to the flange connecting structure with the high sealing performance, when the nut is locked, the nut and the head of the bolt can drive the pressing column to move inwards so as to extrude the sealing column, the sealing column expands and deforms outwards after being pressed, and therefore the connecting position of the bolt is sealed.

Description

TECHNICAL FIELD

[0001] The utility model relates to flange connection technical field, especially, relate to a high sealing flange connection structure. BACKGROUND

[0002] The flange connection structure is a detachable connection structure, which is mainly used for pipeline connection. The structure connects two pipelines, valves or other equipment by two flanges, and realizes tight connection by screwing bolts to ensure the sealing performance of the pipeline system and prevent gas or liquid medium from leaking at the pipeline connection.

[0003] The flange connection structure includes flanges, bolts, nuts and sealing gaskets. There are two flanges, and the sealing gaskets are clamped between the two flanges. The flanges and the sealing gaskets are provided with mounting holes for the bolts to pass through. During assembly, the bolt head passes through the flange on one side, the sealing gasket and the flange on the other side in turn, and then the nut is sleeved on the bolt and tightened. In actual use, the inner ring part of the sealing gasket is close to the conveying medium, which is more prone to aging than the outer ring part, resulting in reduced sealing performance. When the sealing gasket gradually ages from the inside to the outside until the bolt, the conveyed medium will leak outward from the connection part of the bolt and the mounting hole.

[0004] Therefore, it is necessary to improve the flange connection structure to improve the sealing performance of the bolt connection part. UTILITY MODEL CONTENTS

[0005] The utility model solves the technical problem that the bolt connection part of the flange connection structure in the prior art is prone to leakage. The utility model provides a flange connection structure with guaranteed sealing performance.

[0006] The utility model solves the technical problem by adopting the following technical scheme: a high sealing flange connection structure, including first flange, second flange, sealing pad, bolt and nut, the sealing pad is clamped between the first flange and the second flange, the surface of the first flange and the second flange is formed with the butt joint surface that the sealing pad is pasted, the surface of the first flange and the second flange is formed with the locking surface relative to the butt joint surface, the first flange and the second flange are provided with the through -hole for the bolt passes through, the locking surface is provided with the accommodation groove that communicates with the mounting hole, the accommodation groove is installed with the sealing column, the slot mouth in the accommodation groove is slidably installed with the pressure column, the bolt passes through the sealing column and pressure column, the sealing column and the pressure column are elastically resisted.

[0007] Further, the slot size of the accommodating slot is greater than the hole size of the mounting hole, a bottom wall of the accommodating slot forms a support plane, one end of the sealing column elastically abuts against the support plane, and the other end of the sealing column elastically abuts against the pressing column.

[0008] Further, the pressing column is outwardly convex at an end away from the abutting face to form a gasket, the gasket of the pressing column mounted on the first flange is fixedly clamped between the head of the bolt and the locking face, and the gasket of the pressing column mounted on the second flange is fixedly clamped between the nut and the locking face.

[0009] Further, the gasket is a disc-shaped gasket.

[0010] Further, the gasket is made of spring steel material.

[0011] Further, the pressing column and the gasket are in an integral molding structure.

[0012] Further, a plurality of bolts are uniformly connected in the circumferential direction between the first flange and the second flange.

[0013] Further, a connecting portion is fixedly connected at the center of the locking face of the first flange and the second flange.

[0014] The high-sealing flange connecting structure has the advantages that when the locking nut is locked, the nut and the head of the bolt drive the pressing column to move inward, thereby extruding the sealing column, the sealing column is deformed by expansion after being pressed, the fit between the sealing column and the outer wall of the bolt is more compact, the sealing property of the connecting portion of the bolt, the first flange and the second flange is enhanced, and gas or liquid is effectively prevented from leaking from the connecting portion of the bolt. BRIEF DESCRIPTION OF DRAWINGS

[0015] The utility model will be further described in connection with the drawings and examples.

[0016] Figure 1 is the perspective view of the high-sealing flange connecting structure of the utility model;

[0017] Figure 2 is Figure 1 the front view of the high-sealing flange connecting structure shown in the figure;

[0018] Figure 3 is Figure 1 the sectional view of the high-sealing flange connecting structure along A-A shown in the figure.

[0019] In the figure: 1, first flange, 11, mounting hole, 101, butt joint surface, 102, locking surface, 12, accommodating groove, 121, supporting plane, 103, connecting part, 2, second flange, 3, gasket, 4, bolt, 5, nut, 6, sealing column, 7, pressing column, 71, gasket. DETAILED DESCRIPTION

[0020] The utility model will be explained in detail in combination with the drawings. The figure is a simplified schematic diagram, and only the basic structure of the utility model is schematically shown, so it only shows the structure related to the utility model.

[0021] Please refer to Figures 1-3 The utility model provides a kind of high sealing flange connection structure, including first flange 1, second flange 2, gasket 3, bolt 4 and nut 5, first flange 1 and second flange 2 butt joint, gasket 3 is made of elastic sealing material (for example, silica gel or rubber) and is clamped between first flange 1 and second flange 2, bolt 3 passes through first flange 1, gasket 3 and second flange 2 in turn, nut 5 is screwed on the tail of bolt 4, when using, screw nut 5 will first flange 1 and second flange 2 lock tightly fixed.

[0022] First flange 1 and second flange 2 are all provided with a plurality of mounting holes 11 along the circumference, and the mounting holes 11 are used for the bolt 4 to pass through. The surface of the first flange 1 and the second flange 2, which is in contact with the gasket 3, forms a butt joint surface 101. The surface of the first flange 1 and the second flange 2, which is opposite to the butt joint surface 101, forms a locking surface 102. The head of the bolt 3 is pressed against one of the locking surfaces 102, and the nut 5 is pressed against the other locking surface 102.

[0023] The locking surface 102 is provided with an accommodating groove 12, which is coaxially arranged with the mounting hole 11 and communicates with the mounting hole 11. The size of the groove opening of the accommodating groove 12 is greater than the size of the hole opening of the mounting hole 11. In this way, the groove bottom wall of the accommodating groove 12 forms a stepped surface, which constitutes a supporting plane 121. A sealing column 6 is installed in the accommodating groove 12, and the bolt 3 passes through the sealing column 6. The sealing column 6 is in a cylindrical structure and cooperates with the accommodating groove 12. The sealing column 6 is made of elastic sealing material, such as silica gel or rubber. A pressing column 7 is slidably installed in the port of the accommodating groove 12 away from the butt joint surface 101. The pressing column 7 is made of hard material and cooperates with the accommodating groove 12. One end of the sealing column 6 elastically abuts against the supporting plane 121, and the other end of the sealing column 6 elastically abuts against the pressing column 7.

[0024] The sealing column 6 and the pressing column 7 are both provided with openings for the bolt 3 to pass through. In the present embodiment, the opening on the sealing column 6 is a transverse slot, which is in a closed state in the initial state. When the bolt 3 passes through, the slot is opened. The opening on the pressing column 7 is a circular opening.

[0025] In the process of tightening the nut 5, the nut 5 and the head of the bolt 3 will overcome the elastic force of the sealing column 6 and gradually press the pressing column 7 into the accommodating groove 12, so that the sealing column 6 is gradually flattened, and the sealing column 6 expands and deforms outward when being pressed, and then the fit between the sealing column 6 and the outer wall of the bolt 3 is more closely, thereby enhancing the sealing property of the connection part of the bolt 5, the first flange 1 and the second flange 2, and effectively preventing gas or liquid from leaking from the connection part of the bolt 5.

[0026] In the embodiment, the end of the pressing column 7 away from the abutting surface 101 is outwardly protruding and forms a gasket 71, the gasket 71 of the pressing column 7 installed on the first flange 1 is fixedly clamped between the head of the bolt 3 and the locking surface 102, and the gasket 71 of the pressing column 7 installed on the second flange 2 is fixedly clamped between the nut 5 and the locking surface 102, by setting the gasket 71 and tightly fixing the gasket 71, the fixed connection relationship between the pressing column 7 and the first flange 1 and the second flange 2 is realized, so as to improve the installation stability of the pressing column 7.

[0027] Further, the gasket 71 is a disc-shaped gasket made of spring steel material, which elastically deforms when being pressed in the process of tightening the nut 5, thereby playing a pre-tightening role and effectively preventing the nut 5 from being easily loosened.

[0028] In a specific embodiment, the pressing column 7 and the gasket 71 are an integral structure, which is convenient for processing and is also beneficial to the enterprise to control the production cost.

[0029] In the embodiment, a plurality of bolts 4 are uniformly connected between the first flange 1 and the second flange 2 in the circumferential direction, so as to realize the uniformity of force at each position.

[0030] In the embodiment, the center of the locking surface 102 of the first flange 1 and the second flange 2 is fixedly connected with a connecting part 103, and the connecting part 103 is used for connecting with a pipeline.

[0031] The flange connection structure with high sealing property of the utility model, when locking the nut 5, the nut 5 and the head of the bolt 3 will drive the pressing column 7 to move inward, thereby extruding the sealing column 6, the sealing column 6 will expand and deform outward after being pressed, and then the fit between the sealing column 6 and the outer wall of the bolt 3 is more closely, thereby enhancing the sealing property of the connection part of the bolt 5, the first flange 1 and the second flange 2, and effectively preventing gas or liquid from leaking from the connection part of the bolt 5.

[0032] With the above ideal embodiment of the present application as the inspiration, through the above description, relevant staff can make various changes and modifications without deviating from the scope of the present application. The technical scope of the present application is not limited to the content in the specification, and the technical scope must be determined according to the scope of claims.

Claims

1. A high-sealing flange connection structure, comprising a first flange, a second flange, a gasket, bolts, and nuts, wherein the gasket is sandwiched between the first flange and the second flange, the surfaces of the first flange and the second flange that mate with the gasket form mating surfaces, and the surfaces of the first flange and the second flange that oppose the mating surfaces form locking surfaces, characterized in that: The first flange and the second flange are provided with mounting holes for the bolts to pass through. The locking surface is provided with a receiving groove communicating with the mounting holes. A sealing column is installed in the receiving groove. A pressure column is slidably installed in the groove of the receiving groove. The bolts pass through the sealing column and the pressure column, and the sealing column and the pressure column elastically abut against each other.

2. The high-sealing flange connection structure as described in claim 1, characterized in that: The opening size of the receiving groove is larger than the opening size of the mounting hole. The bottom wall of the receiving groove forms a supporting plane. One end of the sealing column elastically abuts against the supporting plane, and the other end of the sealing column elastically abuts against the pressure column.

3. The high-sealing flange connection structure as described in claim 1, characterized in that: The end of the pressure post away from the mating surface protrudes outward to form a washer. The washer of the pressure post installed on the first flange is fixedly clamped between the head of the bolt and the locking surface. The washer of the pressure post installed on the second flange is fixedly clamped between the nut and the locking surface.

4. The high-sealing flange connection structure as described in claim 3, characterized in that: The washer is a disc-shaped washer.

5. The high-sealing flange connection structure as described in claim 4, characterized in that: The washer is made of spring steel.

6. The high-sealing flange connection structure as described in claim 3, characterized in that: The pressure column and the washer are integrally formed.

7. The high-sealing flange connection structure as described in claim 1, characterized in that: Multiple bolts are evenly connected circumferentially between the first flange and the second flange.

8. The high-sealing flange connection structure as described in claim 1, characterized in that: Both the first flange and the second flange have a connecting part fixedly connected to the center of their locking surfaces.

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