A room temperature quick-release sealing structure

Abstract

This utility model discloses a room-temperature quick-release sealing structure, belonging to the field of liquid rocket engine sealing technology. It includes a convex flange, a concave flange, two half-hoops, a sealing ring, and fasteners connecting the two half-hoops. In this application, firstly, the convex flange and the concave flange adopt a uniform outer diameter and matching conical surface design, which allows the conduit assembly to be pre-standardized and manufactured without relying on on-site welding to align the bolt hole phases, fundamentally solving the problem of poor part versatility and production efficiency constraints. Secondly, by using two half-hoops and a small number of fasteners to replace the traditional multi-bolt ring connection of the flange, the radial locking force is efficiently converted into axial clamping force through the mechanical conversion of the V-shaped surface during tightening, thereby realizing the rapid assembly and disassembly of the conduit and significantly improving assembly efficiency.

Description

Technical Field

[0001] This utility model relates to the field of liquid rocket engine sealing technology, specifically to a room temperature quick-release sealing structure. Background Technology

[0002] Currently, in high-end equipment such as liquid rocket engines, the sealing of conduits for ambient temperature media such as compressed air, nitrogen, and kerosene typically employs traditional flange connections. This method consists of two flat flanges with bolt holes, a gasket, and multiple sets of bolts and nuts. This structure has significant drawbacks: First, the bolt holes on the flanges at both ends of the conduit must be perfectly aligned, which often requires on-site welding of the flanges according to the final installation state of the engine. This prevents standardized pre-manufacturing and universal stockpiling of the conduit, severely restricting production efficiency and supply chain flexibility. Second, traditional flange connections require a large number of bolts to be tightened, making assembly and disassembly time-consuming, labor-intensive, and inefficient, hindering rapid equipment maintenance and testing. Utility Model Content

[0003] The purpose of this invention is to provide a room-temperature quick-release sealing structure to replace the traditional flange sealing method, aiming to improve the versatility and interchangeability of the conduit connectors and significantly improve the production, assembly and maintenance efficiency of the engine.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A room-temperature quick-release sealing structure, comprising: A convex flange, wherein the end of the convex flange is provided with a protruding sealing stepped surface; A concave flange, wherein the end of the concave flange is provided with a concave sealing stepped surface that matches the sealing stepped surface of the convex flange, and the two are joined to form a main sealing section; Two half-hoops are arranged opposite each other, and each half-hoop has a V-shaped clamping surface on its inner side. A sealing ring is disposed in a groove between or near the sealing surfaces of the convex flange and the concave flange; the outer sides of the convex flange and the concave flange are provided with mating surfaces that cooperate with the V-shaped clamping surface. Fasteners are used to lock the two half-hoops, causing the V-shaped clamping surfaces to press against the mating surfaces, driving the convex flange and the concave flange to axially approach and compress the sealing ring to achieve a seal.

[0005] A further technical solution is that the V-shaped clamping surface is an inclined surface, and the mating surface is an inclined surface that matches the V-shaped clamping surface.

[0006] A further technical solution is that the V-shaped clamping surface is a concave spherical surface, and the mating surface is a convex spherical surface that matches the V-shaped clamping surface.

[0007] A further technical solution is that the V-shaped clamping surface of the semi-hoop is an outwardly convex spherical surface, and the mating surfaces of the convex flange and the concave flange are inwardly concave spherical surfaces that match the V-shaped clamping surface.

[0008] A further technical solution is that the included angle between the axes of the mating inclined surfaces of the convex flange and the concave flange is 20°~30°.

[0009] A further technical solution is that the surface roughness of the sealing stepped surface of the convex flange and the sealing stepped surface of the concave flange is less than or equal to Ra1.6μm.

[0010] A further technical solution is that the surface roughness of the mating surface is less than or equal to Ra3.2μm.

[0011] A further technical solution is that the fastener includes bolts and nuts, and each half hoop has connecting ears at both ends, and the connecting ears of the two half hoops are fixedly connected by at least two sets of bolts and nuts.

[0012] A further technical solution is that the outer diameters of the convex flange and the concave flange are the same.

[0013] A further technical solution is that the semi-hoop has weight-reducing holes.

[0014] Compared with the prior art, the beneficial effects of this utility model are: This application addresses and solves two core problems raised in the background technology by adopting a technical solution that combines a standardized design of convex and concave flanges with a matching conical surface seal and a V-shaped bevel clamp. First, the convex and concave flanges adopt a unified outer diameter and matching conical surface design, which allows the conduit assembly to be manufactured in a standardized manner in advance without relying on on-site welding to align the bolt hole phases, fundamentally solving the problem of poor part versatility and production efficiency constraints. Second, by using two half-clamps and a small number of fasteners to replace the traditional multi-bolt ring connection of flanges, the radial locking force is efficiently converted into axial clamping force through the mechanical conversion of the V-shaped surface during tightening, thereby realizing the rapid assembly and disassembly of the conduit and significantly improving assembly efficiency. Attached Figure Description

[0015] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the following drawings are provided for illustration: Figure 1 This is a three-dimensional diagram of the room temperature quick-release sealing structure of this utility model.

[0016] Figure 2This is a longitudinal sectional view of the room temperature quick-release sealing structure of Embodiment 1 of this utility model.

[0017] Figure 3 This utility model Figure 2 A magnified view of a portion of point A in the middle.

[0018] Figure 4 This is a longitudinal sectional view of the room temperature quick-release sealing structure of Embodiment 1 of this utility model.

[0019] Figure 5 This utility model Figure 4 A magnified view of a section at point B in the middle.

[0020] Figure 6 This is a longitudinal sectional view of the room temperature quick-release sealing structure of Embodiment 1 of this utility model.

[0021] Figure 7 This utility model Figure 6 A magnified view of a section at point C.

[0022] Icons: 1. Convex flange, 11. Mating surface, 2. Concave flange, 3. Half hoop, 31. V-shaped clamping surface, 32. Connecting lug, 33. Weight reduction hole, 4. Sealing ring, 5. Bolt, 6. Nut, 7. Sealing stepped surface. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0024] Example 1: like Figures 1-3 As shown, this utility model provides a room temperature quick-release sealing structure, including a convex flange 1, a concave flange 2, two half-hoops 3, a sealing ring 4, and fasteners connecting the two half-hoops 3, the fasteners including bolts 5 and nuts 6.

[0025] The convex flange 1 is a tubular joint, with one end designed as a protruding sealing stepped surface 7. The surface roughness of this sealing surface needs to be precisely machined to less than or equal to Ra 1.6 μm (e.g., Ra 1.3 μm) to ensure a good sealing effect. On the outer cylindrical surface of the convex flange 1, there is a mating surface 11 that mates with the semi-hoop 3. The mating surface 11 is an inclined surface. Figure 3 The angle α1 between the inclined surface and the flange axis is designed to be in the range of 20° to 30° (e.g., 25°), and its surface roughness is less than or equal to Ra3.2μm (e.g., Ra1.3μm).

[0026] The structure of the concave flange 2 corresponds to that of the convex flange 1. Its end is a recessed sealing stepped surface 7, which precisely matches the convex conical surface of the convex flange 1. The surface roughness is also no higher than Ra1.6μm (e.g., Ra1.3μm). The outer diameter D2 of the concave flange 2 is the same as the outer diameter D1 of the convex flange 1, ensuring that the outer end face connected into the half-hoop 3 can be aligned. The bevel angle a2 of the concave flange 2 that mates with the half-hoop 3 is equal to the bevel angle a1 of the convex flange 1.

[0027] The sealing ring 4 is made of a material compatible with the medium (such as fluororubber) and can be installed in the groove pre-set at the root of the sealing surface of the convex flange 1 or concave flange 2. Alternatively, it can be placed between the two flange conical surfaces.

[0028] The semi-hoop 3 is a roughly C-shaped component with a V-shaped clamping surface 31 machined on its inner side. The angle of this V-shaped clamping surface 31 is complementary to the angle of the mating inclined surface on the convex and concave flanges 2 to ensure good surface contact. Each semi-hoop 3 has connecting lugs 32 with through holes at both ends. The semi-hoop 3 has weight-reducing holes 33, which can reduce the weight of the semi-hoop 3 and also allow observation of the sealing gap between the convex flange 1 and the concave flange 2.

[0029] The principles and beneficial effects of the above technical solution: During assembly, place the sealing ring 4 in the sealing position and initially align the sealing stepped surfaces 7 of the convex flange 1 and the concave flange 2. Then, fasten the two half-hoops 3 onto the mating ramps of the convex flange 1 and the concave flange 2 from the top and bottom (or left and right) directions. Finally, pass the bolts 5 through the through holes on the connecting lugs 32 of the two half-hoops 3, screw on the nuts 6, and tighten them. During the tightening process, the V-shaped surface of the half-hoops 3 will simultaneously compress the ramps of the convex flange 1 and the concave flange 2, generating a radial component force pointing towards the flange axis. This component force forces the two flanges to overcome possible manufacturing tolerances and come close together axially, thereby uniformly compressing the sealing ring 4 between them to form an effective seal.

[0030] This application addresses and solves two core problems raised in the background technology by adopting a technical solution that combines a standardized design of convex and concave flanges 2 with a matching conical surface seal and a V-shaped bevel clamp. First, the convex flange 1 and concave flange 2 adopt a unified outer diameter and a matching conical surface design, which allows the conduit assembly to be manufactured in a standardized manner in advance without relying on on-site welding to align the bolt hole phases, fundamentally solving the problem of poor part versatility and production efficiency constraints. Second, by using two half-clamps 3 and a small number of fasteners to replace the traditional multi-bolt 5 ring connection of the flange, the radial locking force is efficiently converted into axial clamping force through the mechanical conversion of the V-shaped surface during tightening, thereby realizing the rapid assembly and disassembly of the conduit and significantly improving assembly efficiency.

[0031] Example 2: like Figure 4 , 5As shown, the difference between this embodiment and Embodiment 1 is that the V-shaped clamping surface 31 of the semi-hoop 3 is machined into a concave spherical surface. Figure 5 Correspondingly, the mating surfaces 11 on the outer sides of the convex flange 1 and the concave flange 2 are machined into convex spherical surfaces.

[0032] The principles and beneficial effects of the above technical solution: Spherical fits have self-centering properties, which can automatically compensate for small angular deviations during assembly, making the clamping force distribution more uniform and the requirements for the coaxiality of flange machining and assembly relatively relaxed.

[0033] Example 3: like Figure 6 , 7 As shown, the difference between this embodiment and Embodiment 1 is that the V-shaped clamping surface 31 of the semi-hoop 3 can also be processed into a convex spherical surface. Figure 7 At this point, the mating surfaces 11 on the outer sides of the convex flange 1 and the concave flange 2 need to be machined into concave spherical surfaces.

[0034] The principles and beneficial effects of the above technical solution: This structure also has the self-centering advantage of spherical fit, and the convex spherical semi-hoop 3 may be convenient in manufacturing process.

[0035] Although the present invention has been described herein with reference to several illustrative embodiments, it should be understood that many other modifications and implementations can be devised by those skilled in the art, which will fall within the scope and spirit of the principles disclosed herein. More specifically, various variations and modifications can be made to the components and / or layout of the subject matter combination within the scope of the disclosure, drawings, and claims. Besides variations and modifications to the components and / or layout, other uses will be apparent to those skilled in the art.

Claims

1. A room-temperature quick-release sealing structure, characterized in that, include: A convex flange, wherein the end of the convex flange is provided with a protruding sealing stepped surface; A concave flange, wherein the end of the concave flange is provided with a concave sealing stepped surface that matches the sealing stepped surface of the convex flange, and the two are joined to form a main sealing section; Two half-hoops are arranged opposite each other, and each half-hoop has a V-shaped clamping surface on its inner side. A sealing ring is disposed in a groove between or near the sealing surfaces of the convex flange and the concave flange; the outer sides of the convex flange and the concave flange are provided with mating surfaces that cooperate with the V-shaped clamping surface. Fasteners are used to lock the two half-hoops, causing the V-shaped clamping surfaces to press against the mating surfaces, driving the convex flange and the concave flange to axially approach and compress the sealing ring to achieve a seal.

2. The room temperature quick-release sealing structure according to claim 1, characterized in that: The V-shaped clamping surface is an inclined surface, and the mating surface is an inclined surface that matches the V-shaped clamping surface.

3. The room temperature quick-release sealing structure according to claim 1, characterized in that: The V-shaped clamping surface is a concave spherical surface, and the mating surface is a convex spherical surface that matches the V-shaped clamping surface.

4. The room temperature quick-release sealing structure according to claim 1, characterized in that: The V-shaped clamping surface of the semi-hoop is an outwardly convex spherical surface, and the mating surfaces of the convex flange and the concave flange are inwardly concave spherical surfaces that match the V-shaped clamping surface.

5. The room temperature quick-release sealing structure according to claim 2, characterized in that: The included angle between the axes of the mating inclined surfaces of the convex flange and the concave flange is 20°~30°.

6. A room-temperature quick-release sealing structure according to any one of claims 1-5, characterized in that: The surface roughness of the sealing stepped surface of the convex flange and the sealing stepped surface of the concave flange is less than or equal to Ra1.6μm.

7. A room-temperature quick-release sealing structure according to any one of claims 1-5, characterized in that: The surface roughness of the mating surface is less than or equal to Ra3.2μm.

8. The room temperature quick-release sealing structure according to claim 1, characterized in that: The fasteners include bolts and nuts, and each half hoop has connecting ears at both ends. The connecting ears of the two half hoops are fixedly connected by at least two sets of bolts and nuts.

9. The room temperature quick-release sealing structure according to claim 1, characterized in that: The outer diameters of the convex flange and the concave flange are the same.

10. A room-temperature quick-release sealing structure according to claim 1, characterized in that: The half-hoop has weight-reducing holes.

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