A type of sealed high-pressure movable elbow

Abstract

This utility model relates to the field of sealed high-pressure movable elbows, specifically a sealed high-pressure movable elbow, comprising an integral elbow with a male and a female end integrally formed, located at opposite ends of the integral elbow. The integral elbow has an internal fluid channel connecting the male and female ends. A sealing assembly is installed within the connecting sealing groove between the male and female ends. The sealing assembly includes a first sealing ring, a backing plate, and a water-swellable sealing ring arranged sequentially along the fluid channel direction. The backing plate is symmetrically arranged on the left and right sides of the water-swellable sealing ring. Upon contact with water, the water-swellable sealing ring expands, compressing the backing plate to adhere tightly to the inner wall of the connecting sealing groove, forming a second seal. The beneficial effect is that the sealed high-pressure movable elbow proposed in this utility model uses a combined sealing structure, optimizing the sealing structure and greatly improving sealing performance.

Description

Technical Field

[0001] This utility model relates to the field of sealed high-pressure movable elbows, specifically a sealed high-pressure movable elbow. Background Technology

[0002] High-pressure flexible elbows are key components in high-pressure fluid transmission scenarios such as oil drilling, natural gas transportation, and hydraulic power systems. Their core function is to enable fluid diversion and transmission under high pressure, while allowing the pipelines at both ends of the elbow to rotate at a certain angle to adapt to the dynamic adjustment needs of the pipelines.

[0003] In existing technologies, the sealing structure of high-pressure movable elbows mostly adopts a single O-ring or lip seal, relying on elastic deformation to achieve a tight seal between the male and female joints. However, under harsh operating conditions such as high pressure, frequent rotation, and corrosive media containing particles, the shortcomings of a single sealing structure become increasingly apparent, failing to meet practical application requirements. The lack of a leakage compensation mechanism means that the seal cannot automatically repair itself after failure, and installation and positioning difficulties can easily lead to poor contact of the sealing surface, seriously affecting safety and operational efficiency, forcing frequent shutdowns to replace seals, and significantly increasing maintenance costs. Therefore, this utility model proposes a sealed high-pressure movable elbow to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a sealed high-pressure movable elbow to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a sealed high-pressure movable elbow, comprising an integral elbow, wherein the integral elbow is integrally formed with a male head and a female head, the male head and the female head being located at opposite ends of the integral elbow, and a fluid channel connecting the male head and the female head is provided inside the integral elbow; a tightening sleeve, the tightening sleeve being fitted onto the outside of the male head, the inner sidewall of the tightening sleeve being provided with a rotating convex line; and a fixing sleeve, the fixing sleeve being fitted onto the inside of the tightening sleeve and the outside of the male head, the outer sidewall of the fixing sleeve being provided with a rotating groove that fits the shape of the rotating convex line, the rotating convex line being embedded in... The rotating groove; the fixing sleeve and the fixing block are integrally formed, and the fixing block is snapped into the corresponding slot of the integral elbow; the groove is opened on the connection surface of the male and female ends, and the groove is provided with a ball bearing assembly; the sealing assembly is installed in the fluid channel between the male and female ends, and the sealing assembly includes a first sealing ring, a backing plate and a water-swellable sealing ring arranged sequentially along the direction of the fluid channel, and the backing plate is symmetrically arranged on the left and right sides of the water-swellable sealing ring; the water-swellable sealing ring expands in volume when it comes into contact with water, and squeezes the backing plate to stick tightly to the inner wall of the connecting sealing groove to form a second seal.

[0006] Preferably, the outer wall of the integral elbow is fitted with a cylindrical protrusion. When the tightening sleeve and the fixing sleeve are fully threaded together, the cylindrical protrusion prevents the tightening sleeve from moving along the male axial direction.

[0007] Preferably, when the tightening sleeve rotates, the rotating convex line drives the rotating groove to rotate synchronously, so that the fixing sleeve axially fastens the male head and the female head through the fixing block.

[0008] Preferably, the fixing sleeve and the fixing block are manufactured using an integral molding process, and the shape of the fixing block is adapted to the groove shape of the overall elbow.

[0009] Preferably, the cross-sectional shape of the rotating convex line is trapezoidal, and the cross-sectional shape of the rotating groove is an inverted trapezoid that matches the trapezoidal shape.

[0010] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model solves the problem of leakage caused by the lack of a positioning structure during the installation of existing sealing structures, which leads to the displacement of the sealing element and poor contact of the sealing surface. It achieves the effect of fixing the axial position of the sealing element during installation and uniformly transmitting the extrusion force during expansion, thus avoiding the sealing failure caused by installation errors. 2. This utility model uses a combination sealing structure in which a main sealing ring and a water-swellable secondary sealing ring are sequentially arranged in the connecting sealing groove of the male and female heads, and half-section abutments are symmetrically provided on the left and right sides of the water-swellable secondary sealing ring. This solves the problem that existing single sealing structures leak under high pressure and frequent rotation conditions due to increased gaps in the sealing surface caused by friction and wear or pressure impact, and there is no leakage compensation mechanism. It achieves a dual sealing effect of the main seal preventing direct leakage and the secondary seal compensating for small gaps by expanding upon contact with water, which significantly improves the sealing reliability. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the main structure of the present utility model; Figure 2 This is a cross-sectional schematic diagram of the connection structure of this utility model; Figure 3 This is a schematic diagram of the cross-sectional component of the connection structure of this utility model; Figure 4 This is a schematic diagram of the main sealing structure in the cross-section of the connection structure of this utility model; In the diagram: 1. Integral elbow; 2. Tightening sleeve; 3. Fixing sleeve; 4. Rotating groove; 5. Rotating convex line; 6. Fixing block; 7. Groove; 8. Cylindrical protrusion; 9. Ball bearing; 10. First sealing ring; 11. Abutment; 12. Water-swellable sealing ring; 13. Male head; 14. Female head. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of this utility model clear and complete, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of this utility model, and are merely used to explain the embodiments of this utility model. They are not intended to limit the embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0013] Please see Figures 1 to 4 This utility model provides a technical solution: a sealed high-pressure movable elbow, including an integral elbow 1, the integral elbow 1 being integrally formed with a male head 13 and a female head 14, the male head 13 and the female head 14 being located at opposite ends of the integral elbow 1, the integral elbow 1 having a fluid channel connecting the male head 13 and the female head 14 inside; a tightening sleeve 2, the tightening sleeve 2 being sleeved on the outside of the male head 13, the inner sidewall of the tightening sleeve 2 having a rotating protrusion 5.

[0014] When the tightening sleeve 2 rotates, the rotating convex line 5 drives the rotating groove 4 to rotate synchronously, so that the fixing sleeve 3 axially fastens the male head 13 and the female head 14 through the fixing block 6. The fixing sleeve 3 and the fixing block 6 are made by an integral molding process. The integral molding process makes the structural strength of the fixing sleeve 3 and the fixing block 6 more uniform, and the torque transmission is seamless, avoiding loosening. The shape of the fixing block 6 is adapted to the groove shape of the overall elbow 1. The fixing sleeve 3 is sleeved on the inner side of the tightening sleeve 2 and the outer side of the male head 13. The outer wall of the fixing sleeve 3 is provided with a rotating groove 4 that matches the shape of the rotating convex line 5. The rotating convex line 5 is embedded in the rotating groove 4. The cross-sectional shape of the rotating convex line 5 is trapezoidal, and the cross-sectional shape of the rotating groove 4 is an inverted trapezoid that matches the trapezoid. The cooperation between the trapezoidal cross-section of the rotating convex line 5 and the inverted trapezoidal rotating groove 4 increases the contact area for torque transmission and prevents slippage, especially under high pressure. The outer wall of the integral elbow 1 is fitted with a cylindrical protrusion 8. When the tightening sleeve 2 and the fixing sleeve 3 are fully threaded together, the cylindrical protrusion 8 prevents the tightening sleeve from moving axially along the male end, and the cylindrical protrusion 8 prevents the tightening sleeve 2 from moving axially along the male end 13. This design allows the elbow angle adjustment without disassembling the tightening sleeve 2, and the forward distance of the tightened sleeve 2 is limited by the cylindrical protrusion 8 behind the male end 13. The limiting effect of the cylindrical protrusion 8 effectively avoids deformation of the fixing block 6 or the slot caused by over-tightening, thus protecting the service life of key components. The fixing sleeve 3 and the fixing block 6 are integrally formed. The fixing block 6 is snapped into the corresponding slot of the integral elbow 1. The groove 7 is opened on the connection surface of the male head 13 and the female head 14. The groove 7 is provided with 9 sets of balls. The balls 9 are stainless steel balls, which are used to reduce the rotational friction resistance when the male head 13 and the female head 14 are connected. A sealing assembly is installed in the fluid channel between the male connector 13 and the female connector 14. The sealing assembly includes a first sealing ring 10, a stop plate 11, and a water-swellable sealing ring 12 arranged sequentially along the fluid channel direction. The first sealing ring 10 serves as the main seal, effectively preventing direct leakage of high-pressure fluid. The symmetrical arrangement of the stop plate 11 not only positions the installation position of the water-swellable sealing ring 12 and prevents misalignment, but also evenly transmits pressure to the inner wall of the sealing groove during expansion, thereby increasing the sealing contact area. The water-swellable sealing ring 12's water-swellable characteristic enables automatic compensation after leakage, eliminating the need to stop the machine to replace the seal, reducing maintenance costs. At the same time, the second seal formed improves the overall sealing reliability.

[0015] Working principle: In actual use, the sealing components are first installed: First, the first sealing ring 10 is installed into the sealing groove of the male head 13 and pressed into place with a special tool. Then, the abutment 11 is attached to the left and right sides of the water-swellable sealing ring 12, ensuring symmetry. Finally, the assembled water-swellable sealing ring 12 and abutment 11 are installed into the connecting sealing groove, and the position is adjusted to ensure that the long side of the abutment 11 is in contact with the inner wall of the sealing groove. Next, the male and female heads are connected: Align the guide hole of the female head 14 with the guide cone surface of the male head 13, and slowly push it in until the connecting surfaces of the male head 13 and the female head 14 are in contact. Finally, tighten and fix: Hold the tightening sleeve 2 and rotate it clockwise. The rotating convex line 5 drives the rotating groove 4 of the fixing sleeve 3 to rotate synchronously. The fixing block 6 moves axially along the slot of the integral elbow 1, pressing the male head 13 and the female head 14 axially. If the elbow angle needs to be adjusted, simply rotate the integral elbow 1 and adjust it to the required angle.

[0016] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sealed high-pressure movable elbow, characterized in that, include: An integral elbow (1) is integrally formed with a male head (13) and a female head (14). The male head (13) and the female head (14) are located at the two ends of the integral elbow (1) respectively. The integral elbow (1) is provided with a fluid channel connecting the male head (13) and the female head (14). Tightening sleeve (2), the tightening sleeve (2) is sleeved on the outside of the male head (13), and the inner sidewall of the tightening sleeve (2) is provided with a rotating convex line (5). Fixed sleeve (3), the fixed sleeve (3) is fitted inside the tightening sleeve (2) and outside the male head (13). The outer wall of the fixed sleeve (3) is provided with a rotating groove (4) that fits the shape of the rotating convex line (5). The rotating convex line (5) is embedded in the rotating groove (4). The fixed sleeve (3) and the fixed block (6) are integrally formed. The fixed block (6) is snapped into the corresponding slot of the integral elbow (1). Groove (7), the groove (7) is opened on the connecting surface of the male head (13) and the female head (14). The groove (7) is provided with a set of ball bearings (9). A sealing assembly is installed in the fluid channel between the male head (13) and the female head (14). The sealing assembly includes a first sealing ring (10), a backing plate (11), and a water-swellable sealing ring (12) arranged sequentially along the direction of the fluid channel. The backing plate (11) is symmetrically arranged on the left and right sides of the water-swellable sealing ring (12). The water-swellable sealing ring (12) expands in volume after encountering water, squeezing the backing plate (11) to adhere tightly to the inner wall of the connecting sealing groove, forming a second seal.

2. The sealed high-pressure movable elbow according to claim 1, characterized in that: The outer wall of the integral elbow (1) is fitted with a cylindrical protrusion (8). When the tightening sleeve (2) and the fixing sleeve (3) are fully threaded together, the cylindrical protrusion (8) prevents the tightening sleeve (2) from moving axially along the male head (13).

3. The sealed high-pressure movable elbow according to claim 1, characterized in that: When the tightening sleeve (2) rotates, the rotating convex line (5) drives the rotating groove (4) to rotate synchronously, so that the fixing sleeve (3) axially fastens the male head (13) and the female head (14) through the fixing block (6).

4. A sealed high-pressure movable elbow according to claim 1, characterized in that: The fixing sleeve (3) and the fixing block (6) are made by an integral molding process, and the shape of the fixing block (6) is adapted to the groove shape of the integral elbow (1).

5. A sealed high-pressure movable elbow according to claim 1, characterized in that: The cross-sectional shape of the rotating convex line (5) is trapezoidal, and the cross-sectional shape of the rotating groove (4) is an inverted trapezoid that matches the trapezoidal shape.

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