Single-conical-surface pipeline elastic sealing structure with grooves in two sides

Abstract

The invention provides a pipeline elastic sealing structure with grooves in the two sides of a single conical surface, and belongs to the technical field of pipeline connection.The sealing structure comprises an outer conical connector, an inner conical connector and an outer sleeve nut, and the outer conical connector and the inner conical connector are connected through the outer sleeve nut; an annular groove is formed in the working medium contact wall face on the inner side of the contact conical face of the outer conical connector, and the annular groove forms a pressing face for applying pre-tightening force to the contact conical face of the outer conical connector and the inner conical connector. According to the elastic pipeline sealing structure with the single conical surface and the grooves in the two sides, the effect that the outer cone connector is pressed more and more tightly under the internal pressure effect at the annular groove of the outer cone connector is achieved, the sealing performance of a traditional conical surface sealing structure is improved, and elastic sealing under the high-pressure effect is achieved.

Description

Technical Field

[0001] The present application relates to the field of pipeline connection, and in particular to a pipeline elastic sealing structure with a single-conical surface and double-sided grooves. Background Art

[0002] Cone sealing structure is widely used. The traditional cone sealing structure consists of two parts: inner cone and outer cone. The inner and outer cones squeeze each other to form a sealing effect. Figure 1 The figure shows a typical conical sealing pipe joint structure, which mainly includes an outer conical joint 1, an inner conical joint 2, and an outer nut 3. In actual use, the outer nut 3 needs to be tightened onto the outer conical joint 1 to generate a preload (initial axial tightening force). Under the action of the preload, the conical surfaces 4 of the outer conical joint 1 and the inner conical joint 2 squeeze each other to form a sealing area, thus achieving the sealing effect.

[0003] However, the above-mentioned conical sealing pipe joints are not suitable for use under harsh working conditions such as high temperature, high pressure, and vibration. Figure 2 As shown, due to structural limitations, the sealing cone surface contains gaps through which media can flow. This pressure load, P, exerts a significant axial pull-out load on the sealing surface of the conical seal fitting, reducing the seal contact pressure and compromising the stability of the sealing surface. For example, in the case of the conical seal structure in an aircraft engine piping system, leakage can range from a small amount of liquid seepage to oil dripping. This poses a significant safety hazard to aircraft communications and significantly impacts aircraft reliability. Summary of the Invention

[0004] The purpose of the present application is to provide a pipeline elastic sealing structure with a single cone surface and double-sided grooves to solve or alleviate at least one problem in the background technology.

[0005] The technical solution of the present application is: a single-cone surface double-sided grooved pipeline elastic sealing structure, comprising: an outer cone joint, an inner cone joint and an outer sleeve nut, wherein the outer cone joint and the inner cone joint are connected by an outer sleeve nut, wherein an annular groove is provided on the working medium contact wall on the inner side of the contact cone surface of the outer cone joint, and the annular groove forms a compression surface for applying a pre-tightening force to the contact cone surface of the outer cone joint and the inner cone joint.

[0006] In at least one embodiment of the present application, the contact sealing pressure is increased by reducing the cone angle and / or cone outer diameter of the contact cone surface between the outer cone joint and the inner cone joint.

[0007] In at least one embodiment of the present application, a groove is provided on the contact cone surface of the outer cone joint.

[0008] In at least one embodiment of the present application, the shape of the groove includes triangle, rectangle and ellipse.

[0009] The single-cone surface double-sided grooved pipeline elastic sealing structure of the present application realizes that the outer cone joint becomes tighter and tighter under the action of internal pressure at the annular groove, thereby improving the sealing performance of the traditional cone surface sealing structure and realizing elastic sealing under high pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions provided by this application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of this application.

[0011] Figure 1 It is a schematic diagram of the typical cone sealing pipe joint structure.

[0012] Figure 2 Schematic diagram of pressure load in a typical conical seal pipe joint.

[0013] Figure 3 This is a schematic diagram of the single-cone double-sided grooved pipeline elastic sealing structure of this application.

[0014] Figure 4 Schematic diagram of the sealing structure with different cone angles in this application.

[0015] Figure 5 Schematic diagram of groove structures of different shapes in this application. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below in conjunction with the drawings in the embodiments of this application.

[0017] This application starts from the idea of ​​changing the direction of pressure load action and improves the conical shape of the conical pipe joint to achieve high-pressure sealing.

[0018] like Figure 3 The figure shows an improved single-cone surface double-sided grooved pipeline elastic sealing structure provided by the present application, which structure includes: an outer cone joint 1, an inner cone joint 2 and an outer sleeve nut 3, wherein the outer cone joint 1 and the inner cone joint 2 are connected by the outer sleeve nut 3, wherein an annular groove 11 is provided on the working medium contact wall surface on the inner side of the cone surface of the outer cone joint 1. When the working medium flows in, the side wall of the annular groove 11 close to the side of the inner cone joint 2 forms a compression surface that applies a pre-tightening force to the contact cone surface between the outer cone joint 1 and the inner cone joint 2, so that the annular groove 11 transfers the pressure load P of the working medium from the contact cone surface to the side wall surface of the annular groove 11, thereby improving the sealing effect of the contact cone surface.

[0019] In some embodiments of the present application, a material removal method may be used to provide an annular groove 11 on the working medium contact wall surface on the inner side of the outer cone joint 1 .

[0020] In a preferred embodiment of the present application, under the condition that the preload force remains unchanged, the contact area is reduced and the contact pressure is increased by reducing the cone angle θ and / or the cone outer diameter of the contact between the outer cone joint 1 and the inner cone joint 2.

[0021] like Figure 4 Shown are schematic diagrams of sealing structures with different cone angles θ in this embodiment of the present application, wherein Figure a is an annular groove structure with a larger cone angle, and Figure b is an annular groove structure with a reduced cone angle.

[0022] According to the formula: P = F / S and S = π (R 2 -r 2 ) / cosθ, where P is the pressure load, F is the preload, S is the contact area, R is the outer diameter of the cone, r is the inner diameter of the cone, and θ is the angle of the cone. It can be seen that by reducing the cone angle θ and the outer diameter R, the contact area S can be reduced. While the preload F remains unchanged, the contact pressure load P can be increased, thereby improving the sealing effect of the cone surface.

[0023] In a preferred embodiment of the present application, a groove 12 is provided on the contact conical surface of the outer conical joint 1. The groove 12 transforms the contact conical surface of the outer conical joint 1 into an elastic structure, so that the contact conical surface becomes tighter and tighter under the internal pressure of the annular groove 11. Furthermore, the groove 12 can be a groove structure of different shapes such as a triangle, a rectangle, or an ellipse.

[0024] Based on the principle of flexibility, the present application removes the material of the contact cone surface of the outer cone joint 1 to increase the elasticity of the lip, and improves the sealing effect by changing the shape of the contact cone surface using the curved surface principle.

[0025] like Figure 5 Figure 1 shows schematic diagrams of groove structures of different shapes in this embodiment of the present application. Figure a shows a structure with a triangular groove on the contact cone, Figure b shows a structure with a rectangular groove, and Figure c shows a structure with an elliptical groove. By adding groove 12 to the contact cone, a dual seal is formed on the contact cone. The combined design of annular grooves on both sides of a single cone and grooves of different shapes achieves a tighter seal under internal pressure at the annular groove, improving the sealing performance of traditional cone sealing structures and achieving a resilient seal under high pressure.

[0026] After experimental verification, the improved conical sealing structure can significantly improve the sealing reliability under high pressure, wide temperature range and vibration environment.

[0027] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A single-cone double-sided grooved pipeline elastic sealing structure, characterized in that: include: An outer cone joint, an inner cone joint and an outer sleeve nut, wherein the outer cone joint and the inner cone joint are connected by the outer sleeve nut, wherein an annular groove is provided on the working medium contact wall surface on the inner side of the contact cone surface of the outer cone joint, and the annular groove forms a compression surface for applying a pre-tightening force to the contact cone surface of the outer cone joint and the inner cone joint.

2. The single-cone double-sided grooved pipeline elastic sealing structure according to claim 1, characterized in that: The contact sealing pressure is increased by reducing the cone surface angle and / or cone surface outer diameter of the contact cone surface between the outer cone joint and the inner cone joint.

3. The single-cone double-sided grooved pipeline elastic sealing structure according to claim 1 or 2, characterized in that: A groove is provided on the contact cone surface of the outer cone joint.

4. The single-cone double-sided grooved pipeline elastic sealing structure according to claim 3, characterized in that: The shapes of the groove include triangle, rectangle and ellipse.

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