Water conservancy pipeline connecting structure

Abstract

The utility model discloses a water conservancy pipeline connecting structure, which relates to the technical field of water conservancy projects, and comprises two flange plates which are oppositely arranged and are respectively sealed and fixed at the end parts of pipelines on two sides, and flange holes between the two flange plates are connected through bolts; a first sealing structure and a second sealing structure are arranged between the two flange plates; the first sealing structure comprises a chamfer arranged on the outer side of a center hole of the flange plate and a fixing sleeve inserted into the center hole, a guide inclined face expanding outwards and matched with the chamfer is arranged on the fixing sleeve, and a first sealing ring is clamped between the guide inclined face and the chamfer. A second sealing ring is clamped between the two opposite fixing sleeves; the second sealing structure comprises a sealing gasket clamped between the two flange plates. By arranging two layers of sealing structures, the sealing effect is improved, and liquid leakage caused by aging of the sealing gasket is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of water conservancy projects, in particular to a water conservancy pipeline connection structure. Background Art

[0002] In water conservancy projects, it is often necessary to connect pipes. The existing connection method is generally to clamp a sealing gasket between the flanges of the two pipes, and then tighten the two flanges with bolts to achieve sealing. However, this sealing method is not firm and the sealing gasket is prone to aging; when the flange is unevenly stressed, it is easy to cause local leakage of the sealing gasket. Utility Model Content

[0003] The utility model aims to provide a water conservancy pipeline connection structure, which improves the sealing effect and avoids liquid leakage caused by aging of the sealing pad by arranging two layers of sealing structure.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a water conservancy pipeline connection structure, including two flanges that are arranged opposite to each other and are respectively sealed and fixed on the ends of the pipelines on both sides, and the flange holes between the two flanges are connected by bolts; a first sealing structure and a second sealing structure are arranged between the two flanges; the first sealing structure includes a chamfer arranged on the outside of the center hole of the flange and a fixing sleeve inserted in the center hole, and the fixing sleeve is provided with a guide bevel that expands outward and cooperates with the chamfer, and a first sealing ring is clamped between the guide bevel and the chamfer; a second sealing ring is clamped between the two opposite fixing sleeves; the second sealing structure includes a sealing gasket clamped between the two flanges.

[0005] After adopting the above structure, when the bolts between the two flanges are tightened, the flanges clamp the fixing sleeves, and the two fixing sleeves interact with each other and squeeze to both sides respectively, so that the chamfers and guide bevels are pressed together, the first sealing ring and the second sealing ring are clamped, and the first layer of sealing is achieved; the two flanges squeeze each other and clamp the sealing gasket to achieve the second layer of sealing. When the water flow pressure in the pipeline is large and pressure is applied outward, the two fixing sleeves repel each other, and the force between the two flanges is dispersed to the entire flange, rather than relying solely on the force of the bolts, thereby reducing the impact strength on the sealing gasket, thereby improving the sealing effect, making the seal more secure, and also avoiding the problem of local leakage caused by uneven force on the flange.

[0006] In order to ensure the matching stability between the fixing sleeve and the flange and prevent the first sealing ring from being subjected to uneven force, the inclination angles of the chamfer and the guide slope are consistent.

[0007] In order to improve the force transmission effect and reduce the force on the bolt, the inclination angle is 10 to 45 degrees.

[0008] In order to further improve the force transmission effect, the inclination angle is 30°.

[0009] In order to avoid the formation of a step surface and cause water flow transport resistance, a transition slope is provided on the inner end surface of one end of the fixing sleeve inserted into the center hole.

[0010] In order to ensure the stability of the positions of the first sealing ring and the second sealing ring, a first sealing ring installation groove is provided on the guide inclined surface, and a second sealing ring installation groove is provided on the fixing sleeve corresponding to the second sealing ring.

[0011] In order to improve the stability of the installation position of the sealing gasket, the sealing gasket is an annular structure, and an avoidance hole is opened on it corresponding to the flange hole of the flange plate.

[0012] After adopting the above technical solution, the beneficial effects of the utility model are:

[0013] The utility model discloses a water conservancy pipeline connection structure which solves the technical problem of poor pipeline connection sealing in the prior art. The utility model provides a two-layer sealing structure, thereby improving the sealing effect and avoiding liquid leakage caused by aging of the sealing pad. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of a water conservancy pipeline connection structure of the utility model;

[0015] Figure 2 yes Figure 1 Exploded diagram of

[0016] Figure 3 yes Figure 1 A cross-sectional view of

[0017] Figure 4 yes Figure 3 A partial enlarged view of middle A.

[0018] In the figure, 1. pipeline, 2. flange, 21. center hole, 3. first sealing structure, 31. chamfer, 32. fixing sleeve, 321. guide slope, 322. transition slope, 33. first sealing ring, 34. second sealing ring, 4. sealing gasket, 41. avoidance hole. DETAILED DESCRIPTION

[0019] The utility model is further described below in conjunction with the accompanying drawings.

[0020] The orientations mentioned in this specification are based on the orientations of the hydraulic pipe connection structure of the utility model during normal operation, and do not limit the orientations during storage and transportation. They only represent relative positional relationships, not absolute positional relationships.

[0021] like Figure 1As shown, a water conservancy pipeline connection structure includes two flanges 2 arranged opposite to each other and respectively sealed and fixed to the ends of the pipelines 1 on both sides, and the flanges 2 are fixed to the pipelines 1 by welding. The flange holes between the two flanges 2 are connected by bolts.

[0022] like Figure 2 , Figure 3 and Figure 4 As shown together, a first sealing structure 3 and a second sealing structure are arranged between the two flanges 2; the first sealing structure 3 includes a chamfer 31 arranged outside the center hole 21 of the flange 2 and a fixing sleeve 32 inserted into the center hole 21. The fixing sleeve 32 is provided with a guide bevel 321 that expands outward and matches the chamfer 31. The fixing sleeve 32 includes a cylindrical body and a conical body, wherein the outer diameter of the cylindrical body is adapted to the inner diameter of the center hole 21, so as to ensure its smooth insertion, and the outer contour of the conical body is the above-mentioned guide bevel 321, which matches the chamfer 31.

[0023] A first sealing ring 33 is sandwiched between the guide bevel 321 and the chamfer 31; in order to prevent the first sealing ring 33 from sliding and causing sealing failure, a first sealing ring installation groove is provided on the guide bevel 321. A second sealing ring 34 is sandwiched between the two opposite fixing sleeves 32; in order to ensure the position of the second sealing ring 34, a second sealing ring installation groove is provided on the fixing sleeve 32 corresponding to the second sealing ring 34.

[0024] The second sealing structure includes a sealing gasket 4 clamped between two flanges 2 . The sealing gasket 4 is an annular structure, and a relief hole 41 is formed on the sealing gasket corresponding to the flange hole of the flange 2 .

[0025] During installation, first install the first sealing ring 33 on the fixing sleeve 32, then insert the fixing sleeve 32 into the corresponding center hole 21 of the flange 2, then clamp the sealing gasket 4 between the two flanges 2, and tighten the two flanges 2 by bolts. After tightening the bolts between the two flanges 2, the flanges 2 clamp the fixing sleeve 32, and the two fixing sleeves 32 interact with each other and squeeze to both sides, so that the chamfer 31 and the guide bevel 321 are pressed together, and the first sealing ring 33 and the second sealing ring 34 are clamped to achieve the first layer of sealing; the two flanges 2 squeeze each other and clamp the sealing gasket 4 to achieve the second layer of sealing. When the water flow pressure in the pipeline 1 is large and pressure is applied outward, the two fixing sleeves 32 repel each other, and the force between the two flanges 2 is dispersed to the entire flange 2, rather than relying solely on the force of the bolts, thereby reducing the impact strength on the sealing gasket 4, thereby improving the sealing effect and making the sealing more secure, while also avoiding the problem of local leakage caused by uneven force on the flange 2.

[0026] The inclination angles of the chamfer 31 and the guide bevel 321 may be different, but in order to ensure the matching stability between the fixing sleeve 32 and the flange and prevent the first sealing ring 33 from being subjected to uneven force, the inclination angles of the chamfer 31 and the guide bevel 321 are consistent. The inclination angle is 10 to 45 degrees, and the preferred inclination angle in this embodiment is 30 degrees.

[0027] In order to avoid the formation of a step surface that would cause resistance to water flow, a transition slope 322 is provided on the inner end surface of one end of the fixing sleeve 32 inserted into the central hole 21 .

[0028] The utility model discloses a water conservancy pipeline connection structure which solves the technical problem of poor pipeline connection sealing in the prior art. The utility model provides a two-layer sealing structure, thereby improving the sealing effect and avoiding liquid leakage caused by aging of the sealing pad.

[0029] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A water conservancy pipeline connection structure, characterized in that: It comprises two flanges which are arranged opposite to each other and are respectively sealed and fixed at the ends of the pipes on both sides, and the flange holes between the two flanges are connected by bolts; a first sealing structure and a second sealing structure are arranged between the two flanges; The first sealing structure comprises a chamfer arranged outside the center hole of the flange and a fixing sleeve inserted in the center hole, the fixing sleeve is provided with a guide inclined surface expanding outward and cooperating with the chamfer, a first sealing ring is sandwiched between the guide inclined surface and the chamfer; a second sealing ring is sandwiched between the two opposite fixing sleeves; The second sealing structure includes a sealing gasket clamped between the two flanges.

2. A water conservancy pipeline connection structure according to claim 1, characterized in that: The chamfer and the guide bevel have the same inclination angle.

3. A water conservancy pipeline connection structure according to claim 2, characterized in that: The inclination angle is 10 to 45 degrees.

4. A water conservancy pipeline connection structure according to claim 3, characterized in that: The inclination angle is 30°.

5. A water conservancy pipeline connection structure according to claim 1, characterized in that: The inner end surface of one end of the fixing sleeve inserted into the central hole is provided with a transition slope.

6. A water conservancy pipeline connection structure according to claim 1, characterized in that: A first sealing ring installation groove is arranged on the guide inclined surface, and a second sealing ring installation groove is arranged on the fixing sleeve corresponding to the second sealing ring.

7. A water conservancy pipeline connection structure according to claim 1, characterized in that: The sealing gasket is an annular structure, and a relief hole is provided on the sealing gasket corresponding to the flange hole of the flange plate.

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