Square flange seal quick coupling and method of sealing a connection

Abstract

The application discloses a square flange sealing quick joint and a sealing connection method, and relates to the technical field of sealing connection, in particular to a square flange sealing quick joint and a sealing connection method. The square flange sealing quick joint comprises a positioning seat, a pressing plate, a limiting block and a knurled nut, a rectangular groove is formed on one side end face of the positioning seat in the circumferential direction, the rectangular plate part of the pressing plate is arranged in the rectangular groove, the screw part is threadedly connected with the knurled nut through the through hole on the positioning seat, and one end of the knurled nut is limited on the positioning seat through the limiting block. When the square flange sealing quick joint is used for sealing connection of a square flange joint fuel pipe, the knurled nut is rotated to drive the pressing plate to move, so that the rectangular groove of the positioning seat forms a space height sufficient to accommodate the square flange on the square flange joint fuel pipe, then the square flange is inserted into the rectangular groove, the knurled nut is rotated again to drive the pressing plate to press the O-shaped ring on the end face of the square flange, and the sealing connection work is completed. The square flange sealing quick joint is simple in operation, high in sealing installation and dismounting efficiency, and high in sealing connection quality.

Description

Technical Field

[0001] This invention belongs to the technical field of aero-engine testing equipment, specifically a square flange sealing quick connector and sealing connection method. Background Technology

[0002] After the aircraft engine test is completed, the fuel line at the square flange interface of the test stand needs to be sealed (e.g., Figure 17 As shown, to ensure that the fuel pipe is leak-free and free from contamination, the square flange interface fuel pipe includes four main parts: fuel pipe connector 7, square flange 8, bolt hole 9, and O-ring 10.

[0003] Typically, sealing of fuel pipes with square flange interfaces involves using the four bolt holes 9 on the fuel pipe to fasten the square gland and O-ring 10 to the fuel pipe with bolts and nuts. However, this sealing method is cumbersome and inefficient because it requires operating multiple bolts and nuts simultaneously. More importantly, it requires ensuring that the torque of each bolt is nearly identical; otherwise, uneven deformation pressure of the pressure plate on the O-ring 10 can lead to poor sealing quality or even misalignment of the O-ring 10 and leakage. Therefore, a quick-connect device and method for sealing square flange interfaces is needed to meet the requirements of aero-engine test benches for rapid sealing of fuel pipes with square flange interfaces. Summary of the Invention

[0004] The present invention aims to provide a quick-sealing connector for square flanges and a sealing connection method, which can meet the need for rapid sealing of fuel pipes at square flange interfaces of aero-engine test benches, and achieve the process requirements of no leakage and no pollution of fuel pipes at square flange interfaces of aero-engine test benches.

[0005] The technical solution of the present invention is as follows:

[0006] Square flange sealing quick coupling, including,

[0007] The positioning seat has a rectangular groove on one side end face in the circumferential direction, a through hole and a connecting hole on the upper axial end face of the positioning seat, and a fuel pipe receiving groove on the lower axial end face. The through hole and the fuel pipe receiving groove are connected to the rectangular groove, which is a blind groove.

[0008] The pressure plate is T-shaped and includes a screw that is inserted into a through hole in the positioning seat, and a rectangular plate that is connected to the screw and placed in a rectangular groove.

[0009] The limiting block includes a left half and a right half, which are symmetrical about the splicing surface. The left half and the right half are spliced ​​together along the splicing surface to form the limiting block. The limiting block has a stepped through hole and a mounting hole, and is connected to the upper end face of the positioning seat through screws, mounting holes and connecting holes.

[0010] The knurled nut has a central threaded through hole along its axial direction. The central threaded through hole is sleeved on the outside of the screw of the pressure plate. The outer surface of the knurled nut has an annular groove, and the end of the knurled nut with the annular groove is inserted into the stepped through hole of the limiting block.

[0011] Furthermore, the rectangular groove in the positioning seat has two steps at its opening.

[0012] Furthermore, the fuel pipe receiving groove in the positioning seat includes a square groove and a semi-circular groove that are connected to each other, and the width of the square groove and the diameter of the semi-circular groove are greater than the outer diameter of the fuel pipe joint of the square flange interface fuel pipe.

[0013] Furthermore, the left and right halves of the limiting block are joined together by cylindrical pins perpendicular to the splicing surface.

[0014] A quick-sealing connection method for a fuel pipe with a square flange interface, using the aforementioned quick-sealing coupling with a stepped square flange, includes the following steps:

[0015] Step 1: Rotate the knurled nut to drive the pressure plate to move and bring the rectangular plate of the pressure plate closer to the knurled nut until the height between the rectangular plate and the fuel pipe receiving groove is greater than the height of the square flange of the fuel pipe of the square flange interface.

[0016] Step 2: Insert the square flange of the fuel pipe into the rectangular groove from the circumferential side end face of the positioning seat, with the upper end face of the square flange located below the rectangular plate and the circumferential side end face of the square flange between two steps and one inner wall of the rectangular groove.

[0017] Step 3: Rotate the knurled nut to drive the pressure plate to move, causing the rectangular plate of the pressure plate to move towards the upper end face of the square flange and press against the upper end face of the square flange.

[0018] Compared with existing technologies, the square flange sealing quick connector of the present invention can quickly and accurately position and fix the fuel pipe of the square flange interface. It eliminates the need to tighten the pressure plate with multiple screws to achieve end face sealing of the fuel pipe of the square flange interface. It can achieve quick installation and quick removal of the fuel pipe of the square flange interface on the aero-engine test stand by simply inserting and pulling it out from one side, which greatly improves work efficiency. Since the rectangular plate is pressed by a single screw, the flatness is better, ensuring consistent contact of the pressing plane and consistent deformation of the O-ring, which further improves the quality of the sealing work and well meets the usage requirements. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the assembly of a square flange sealing quick coupling and a square flange interface fuel pipe.

[0020] Figure 2 yesFigure 1 Axial cross-sectional view;

[0021] Figure 3 yes Figure 1 Top view;

[0022] Figure 4 This is a schematic diagram of a square flange sealing quick coupling;

[0023] Figure 5 yes Figure 4 Axial cross-sectional view;

[0024] Figure 6 yes Figure 4 Top view;

[0025] Figure 7 This is a schematic diagram of the positioning seat;

[0026] Figure 8 yes Figure 7 Cross-sectional view;

[0027] Figure 9 yes Figure 7 A bottom view;

[0028] Figure 10 This is a schematic diagram of the pressure plate;

[0029] Figure 11 yes Figure 10 The left view;

[0030] Figure 12 This is the intention of the limit block;

[0031] Figure 13 yes Figure 12 Cross-sectional view;

[0032] Figure 14 yes Figure 12 Left half of the bottom view;

[0033] Figure 15 This is a schematic diagram of a knurled nut;

[0034] Figure 16 This is a 3D view of the assembly of a square flange sealing quick coupling and a square flange interface fuel pipe;

[0035] Figure 17 This is a 3D diagram of a fuel pipe with a square flange interface;

[0036] In the diagram, 1-positioning seat, 2-pressure plate, 3-limiting block, 4-knurled nut, 5-cylindrical pin, 6-hex socket screw, 7-fuel pipe connector, 8-square flange, 9-bolt hole, 10-O-ring, 31-left half, 32-right half. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, it should not be construed that the scope of the subject matter of the present invention is limited to the following embodiments. All modifications, substitutions and alterations made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention are included within the scope of the present invention.

[0038] from Figure 17 As can be seen, after the aero-engine test run is completed, the square flange interface fuel pipe supplying fuel to the aero-engine from the test bench needs to be sealed to ensure the fuel pipe is leak-free and clean. To achieve a fast and efficient sealing installation method, a design was developed as follows... Figure 16 The image shows a square flange sealing quick coupling. (Example) Figures 1-15 As shown, the square flange sealing quick coupling includes a positioning seat 1, a pressure plate 2, a limiting block 3, a knurled nut 4, a cylindrical pin 5, and an internal hexagon screw 6. The structural features of each component are described below with reference to the attached drawings:

[0039] like Figures 4-6 as well as Figures 7-9 The image shows positioning seat 1. Positioning seat 1 has a cuboid structure, and surface A of the cuboid has an L×W1×H2 cuboid blind hole (rectangular groove). Figure 9 .like Figure 7 The upper surface of the positioning seat 1 is a unidirectional through groove (fuel pipe receiving groove) on surface A. One end of the groove is a semi-circular arc-shaped R end face (the closed end of the through groove). The semi-circular arc R dimension is larger than the outer diameter of the fuel pipe of the square flange interface fuel pipe, which facilitates the installation of the square flange interface fuel pipe without interference. The W1 dimension in the L×W1×H2 cuboid blind hole restricts the Y-axis degree of freedom of the square flange interface fuel pipe, such as... Figure 8 The upper right end of the L×W1×H2 cuboid blind hole has an h×L2 step, which is used to hold the fuel pipe of the square flange interface in the positioning seat 1, thereby restricting the X-axis degree of freedom of the fuel pipe of the square flange interface. The lower end has a ΦD through hole for the stud of the pressure plate 2 to pass through. The end face of the positioning seat 1 has a 4-M threaded through hole for installing the fixing limit block 3. The material of the positioning seat 1 is LY11, which has low density and light weight.

[0040] like Figure 10 and Figure 11 The pressure plate 2 is T-shaped, with an L×W1×h square platform on the right end. The right end of the pressure plate 2 is used to seal the end face of the square flange 8 of the fuel pipe at the square flange interface. The left end has an M×H stud. The stud, driven by the threading force, causes the pressure plate 2 to move up and down (restricting the Z-axis freedom of the fuel pipe at the square flange interface), achieving a quick seal. The pressure plate 2 is made of LY11, which has low density and light weight.

[0041] like Figures 12-14The limiting block 3 is composed of two cuboids, left half 31 and right half 32. The purpose of dividing the block into left and right halves 31 and 32 is to facilitate the installation of the knurled nut 4 within the limiting block 3 through splicing and disassembly. This allows the central ΦD1×h cylindrical platform to be positioned within the Φd2×h2 annular groove on the knurled nut 4, thus restricting its vertical movement. The left and right halves 31 and 32 are combined into a single unit and connected by two Φd cylindrical pins 5 to form a single limiting block 3. ΦD represents a stepped hole, and four countersunk screw holes are used to connect the limiting block 3 to the positioning seat 1 using hexagonal socket screws 6. The limiting block 3 is made of LY11, a material with low density and light weight.

[0042] like Figure 15 The knurled nut 4 is a cylindrical stepped body with a central threaded through hole. Φd0×H1 is a cylinder with knurled outer diameter, serving as the operating component for manual rotation of the knurled nut 4. The lower end Φd2×h2 annular groove engages with the ΦD1×h of the limiting block 3, thereby restricting the Z-axis freedom of the knurled nut 4. Under the action of the thread lifting force, it achieves the purpose of rapid sealing by moving the pressure plate 2 up and down. The material of the knurled nut 4 is LY11, which has low density and light weight.

[0043] like Figure 12 The cylindrical pin 5 serves to position and assemble the left half 31 and the right half 32 into a single unit. The cylindrical pin 5 is made of LY11, a material with low density and light weight.

[0044] The hex socket screw 6 is used to install and fix the limit block 3 onto the positioning seat 1. The hex socket screw 6 is made of LY11, which has low density and light weight.

[0045] The working principle and operating steps of using the above-mentioned square flange sealing quick coupling to connect the fuel pipe of the square flange interface are as follows:

[0046] Step 1: First, before sealing the fuel pipe at the square flange interface, move the pressure plate 2 of the square flange sealing quick connector upwards by rotating the knurled nut 4. This ensures that the square flange 8 of the fuel pipe at the square flange interface can be engaged in the L×W1×H2 cuboid blind hole on surface A of the positioning seat 1. That is, lifting the pressure plate 2 by rotating the knurled nut 4 ensures... Figure 2 The height of dimension h in the middle is greater than the step height of the square flange 8 of the square flange interface fuel pipe.

[0047] Step 2: Then, insert the fuel pipe of the square flange interface into the positioning seat 1 of the square flange sealing quick connector through the opening of the L×W1×H2 cuboid blind hole on the A side of the square flange sealing quick connector. At this time, the fuel pipe of the square flange interface is accurately positioned in the square flange sealing quick connector under the limiting guidance of the positioning seat 1.

[0048] Step 3: Finally, rotate the knurled nut 4. Under the pushing force of the threaded advance of the knurled nut 4 and the positioning action of the positioning seat 1 and the limiting block 3, the bottom surface of the rectangular plate of the pressure plate 2 is tightly fitted with the end face of the fuel pipe of the square flange interface and the O-ring 10 to achieve the purpose of quick sealing (limiting the Z-axis degree of freedom of the fuel pipe of the square flange interface). At the same time, the fuel pipe connector 7 and the square flange 8 are firmly locked in the square flange sealing quick connector. Figure 11 The L-shaped dimension restricts the X-axis degree of freedom, while the slot width W1 restricts the Y-axis degree of freedom.

[0049] The quick-sealing device for square end-face sealing fuel pipe joints of the present invention has been verified through application, showing that the time required for sealing the pipe joint is reduced by approximately 60%, and the reliability of the joint sealing reaches the goal of "one-time success". The quick-sealing device has built-in positioning and limiting functions, reducing reliance on manual operation skills and other positioning tools. The quick-sealing device has a high degree of integration, requires no additional auxiliary tools or components, is easy to operate, and has good ergonomic characteristics. The concept provided by the present invention has good promotional value in the development of open sealing or plugging devices for mechanical products.

[0050] Contents not described in detail in this specification are prior art known to those skilled in the art. Although illustrative specific embodiments of the invention have been described above to facilitate understanding by those skilled in the art, it should be understood that the invention is not limited to the scope of the specific embodiments. Various modifications are readily apparent to those skilled in the art as long as they fall within the spirit and scope of the invention as defined and determined by the appended claims, and all inventions utilizing the concept of this invention are protected.

Claims

1. A method for quick sealing connection of a fuel pipe with a square flange interface, characterized in that: A square flange sealing quick coupling is adopted, wherein the square flange sealing quick coupling includes, The positioning seat (1) has a rectangular groove on one side end face in the circumferential direction, a through hole and a connecting hole on the upper axial end face of the positioning seat (1), and a fuel pipe receiving groove on the lower axial end face. The through hole and the fuel pipe receiving groove are connected to the rectangular groove. The rectangular groove is a blind groove. The groove width of the rectangular groove realizes the restriction of the Y-axis degree of freedom of the fuel pipe of the square flange interface. The pressure plate (2) is T-shaped and includes a screw inserted into the through hole of the positioning seat (1) and a rectangular plate connected to the screw and placed in a rectangular groove. The limiting block (3) includes a left half (31) and a right half (32). The left half (31) and the right half (32) are symmetrical about the splicing surface, and the left half (31) and the right half (32) are spliced ​​together along the splicing surface to form the limiting block (3). The limiting block (3) has a stepped through hole and a mounting hole, and is connected to the upper end face of the positioning seat (1) through screws, mounting holes and connecting holes. The knurled nut (4) has a central threaded through hole along the axial direction of the knurled nut (4). The central threaded through hole is sleeved on the outside of the screw of the pressure plate (2). The outer surface of the knurled nut (4) has an annular groove, and the end of the knurled nut (4) with the annular groove is inserted into the stepped through hole of the limiting block (3). The rectangular groove in the positioning seat (1) has two steps at the opening, which are used to hold the square flange interface fuel pipe in the positioning seat (1) to restrict the X-axis direction freedom of the square flange interface fuel pipe. The fuel pipe receiving groove in the positioning seat (1) includes a square groove and a semi-circular groove that are connected to each other, and the width of the square groove and the diameter of the semi-circular groove are greater than the outer diameter of the fuel pipe joint (7) of the square flange interface fuel pipe. The quick-sealing connection method includes the following steps: Step 1: Rotate the knurled nut (4) to drive the pressure plate (2) to move and make the rectangular plate of the pressure plate (2) move closer to the knurled nut (4) until the height between the rectangular plate and the fuel pipe receiving groove is greater than the height of the square flange (8) of the square flange interface fuel pipe. Step 2: Insert the square flange (8) of the fuel pipe into the rectangular groove from the rectangular groove opening on the circumferential side end face of the positioning seat (1), with the upper end face of the square flange (8) located below the rectangular plate and the circumferential side end face of the square flange (8) between two steps and one inner wall of the rectangular groove. Step 3: Rotate the knurled nut (4) to drive the pressure plate (2) to move and make the rectangular plate of the pressure plate (2) move toward the upper end face of the square flange (8) and press against the upper end face of the square flange (8).

2. The method for quick sealing connection of a fuel pipe with a square flange interface according to claim 1, characterized in that: The left half (31) and the right half (32) of the limiting block (3) are joined together by a cylindrical pin (5) perpendicular to the splicing surface.

Images