Beam type pipe joint installation torque evaluation method and application

Abstract

The invention discloses a beam type pipe joint installation torque evaluation method and application. The method comprises the steps that the sealing end face of a female joint is divided into a first sealing face interval and a second sealing face interval; the sealing pressure of the first sealing face is obtained according to the axial force and the sealing width of the first sealing face; the axial force and the sealing width of the second sealing face are obtained, and the sealing pressure of the second sealing face is obtained according to the axial force and the sealing width of the second sealing face; the total axial force of the beam type pipe joint is obtained according to the sealing pressure and the sealing area of the first sealing face and the second sealing face, and the installation torque needed by sealing installation of the beam type pipe joint is obtained according to the total axial force. According to the method, the optimal installation torque of the beam type pipe joint can be obtained without a large number of tests, the sealing performance of the beam type pipe joint can be well guaranteed, and structural damage caused by the fact that the installation torque is too large when the beam type pipe joint is installed can be avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of beam-type pipe joint installation, and in particular relates to a beam-type pipe joint installation torque evaluation method and application. Background Art

[0002] As aircraft performance improves, aviation hydraulic pipe fittings are continuously developing towards higher pressure and lighter weight. As a fundamental hydraulic accessory, aviation hydraulic pipe fittings must not only withstand high and low temperatures and high-frequency vibrations, but also withstand the pulsating impact of the fluid inside the fitting. These requirements place high demands on connection strength, sealing, and fatigue resistance. Failure of any pipe component connection can seriously impact system safety. Pipe joints are often the most vulnerable points in the entire system, and their operating environment is quite harsh.

[0003] As one of the most advanced aviation pipe fittings, beam fittings are widely used in aviation hydraulic piping systems. The installation torque of beam fittings is a key indicator for ensuring their sealing, reliability, and other performance characteristics. Improper installation torque can lead to pipeline leakage, damage, and reduced service life, seriously impacting the engineering application of beam fittings. Currently, determining this performance metric can only be achieved through extensive testing, which consumes significant resources and time, resulting in high costs and low efficiency. Summary of the Invention

[0004] The object of the present invention is to provide a beam-type pipe joint installation torque evaluation method and application, so as to solve the problem existing in determining the installation torque of the beam-type pipe joint through experiments.

[0005] The present invention is achieved through the following technical solutions: A method for evaluating the installation torque of a beam-type pipe joint, wherein the beam-type pipe joint includes a female joint, a male joint, and a jacket nut, wherein the sealing end of the female joint is a rotary cantilever beam structure, comprises the following steps: Dividing the sealing end surface of the female connector into a first sealing surface area and a second sealing surface area; The sealing width of the first sealing surface is obtained according to the starting boundary and the ending boundary of the first sealing surface. The axial force of the first sealing surface is obtained according to the relationship between the axial force of the first sealing surface and the deflection and the rotation angle of the cantilever beam. The sealing pressure of the first sealing surface is obtained according to the axial force and the sealing width of the first sealing surface. According to the relationship between the axial force and the compression deformation of the second sealing surface, and the relationship between the sealing diameters and the corresponding sealing widths of the first and second sealing surfaces, the axial force and the sealing width of the second sealing surface are obtained, and the sealing pressure of the second sealing surface is obtained according to the axial force and the sealing width of the second sealing surface; The total axial force of the beam type pipe joint is obtained according to the sealing pressure and sealing area of ​​the first sealing surface and the second sealing surface, and the installation torque required for the sealing installation of the beam type pipe joint is obtained according to the total axial force.

[0006] In some embodiments, the sealing surface of the female connector is divided into a first sealing surface and a second sealing surface with the bottom plane or cross section of the female connector rotary groove as the dividing interface, wherein the first sealing surface section is located within the dividing interface and the second sealing surface section is located outside the dividing interface.

[0007] In some embodiments, the sealing end face of the male connector is used as the reference plane, the circular boundary where the reference plane first contacts the first sealing surface is used as the starting boundary of the first sealing surface, and the translation amount of the current reference plane is used as the critical screw-in depth of the first sealing surface; the circular boundary where the reference plane first contacts the second sealing surface is used as the starting boundary of the second sealing surface, and the translation amount of the current reference plane is used as the critical screw-in depth of the second sealing surface.

[0008] In some embodiments, the axial force of the first sealing surface is obtained according to the relationship between the axial force of the first sealing surface and the deflection and rotation angle of the cantilever beam, under the condition that the difference between the deflection of the cantilever beam and the boundary screw-in depth of the first sealing surface and the second sealing surface is equal.

[0009] In some embodiments, the termination boundary of the first sealing surface is obtained under the condition that the termination boundary angle is equal to the angle of the male connector end face.

[0010] In some embodiments, when the calculated termination boundary is located in the second sealing surface interval, the intersection line of the interface and the sealing surface is used as the termination boundary of the first sealing surface; when the obtained termination boundary is within the interface, it is used as the actual termination boundary.

[0011] In some embodiments, based on the condition that the leakage rates of the first sealing surface and the second sealing surface are equal, the sealing width of the second sealing surface is obtained according to the relationship between the axial force and the compression deformation of the second sealing surface, the relationship between the sealing diameters and the corresponding sealing widths of the first sealing surface and the second sealing surface, the relationship between the sealing pressure of the second sealing surface, the sealing width and sealing pressure of the first sealing surface and the leakage rate formula, and the sealing pressure of the second sealing surface is obtained based on the sealing width.

[0012] On the other hand, the present invention also provides an application of a beam-type pipe joint installation torque evaluation method in the installation of a beam-type pipe joint.

[0013] In some embodiments, parameters of the female connector, male connector, and outer nut in the beam pipe joint are obtained to obtain the installation torque required for installing the beam pipe joint, and the beam pipe joint is installed according to the obtained installation torque.

[0014] Compared with the prior art, the present invention has the following advantages and beneficial effects: Based on the sealing structural characteristics of the beam-type pipe joint, the present invention divides the sealing surface on the female joint into two sealing surfaces. Based on the geometric relationship between parameters such as the axial force and the sealing area of ​​the corresponding sealing surfaces, the installation torque of the beam-type pipe joint is calculated. The optimal installation torque of the beam-type pipe joint can be obtained without requiring extensive testing, thereby effectively ensuring the sealing performance of the beam-type pipe joint and preventing structural damage caused by excessive installation torque during installation of the beam-type pipe joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 Schematic diagram of the division of the two sealing surfaces on the female connector in an embodiment of the present invention.

[0017] Figure 2 Schematic diagram of the starting boundaries of the two sealing surfaces and the critical axial screw-in depth in an embodiment of the present invention.

[0018] Figure 3 These are the design parameters of the female connector and the male connector in the embodiment of the present invention.

[0019] Figure 4 Schematic diagram of force analysis of the cantilever beam of the female connector in an embodiment of the present invention.

[0020] Figure 5 Schematic diagram of the compressed length of the second sealing surface in an embodiment of the present invention.

[0021] in: 10. Female connector, 11. Cantilever beam, 12. Rotary groove, 101. First sealing surface interval, 102. Second sealing surface interval, 103. Interface, 104. Sealing surface; 20. Male connector. 21. Edge of the rotary groove on the end face of the male connector. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0023] Reference Figure 1The beam-type pipe joint consists of a female joint 10, a male joint 20, and an outer sleeve nut, wherein the female joint is a structural component having a rotary cantilever beam 11, the male joint is a structural component having an external thread structure connected to the outer sleeve nut, and the outer sleeve nut is a structural component having an internal thread structure threadedly connected to the male joint.

[0024] The structure of this beam-type pipe joint can refer to the structure disclosed in patent document CN116734055A. The outer sleeve nut is sleeved on the female joint and rotated to connect with the female joint at one end. The other end of the outer sleeve nut is connected to the external thread of the male joint through the internal thread. In this way, when the outer sleeve nut is tightened, the female joint and the male joint can be connected, and the sealing end faces of the female joint and the male joint are pressed together to form a sealed fit.

[0025] In view of the structure of this beam-type pipe joint, the present invention proposes a method for evaluating the installation torque of the beam-type pipe joint to obtain the installation torque of the beam-type pipe joint for guiding the installation of the beam-type pipe joint; the method comprises the following steps: Step 1, dividing the first sealing surface area 101 and the second sealing surface area 102; The bottom plane or cross section of the female connector rotary groove 12 is used as the interface to divide the sealing surface 104 of the female connector into a first sealing surface and a second sealing surface, wherein the first sealing surface section is located within the interface and the second sealing surface section is located outside the interface.

[0026] Step 2: Obtain the starting boundary and critical screw-in depth of the first sealing surface interval and the second sealing surface interval; Take the male connector end face as the reference plane, translate it along the axis, and make the circular boundary where the reference plane first contacts the first sealing surface the starting boundary of the first sealing surface. The translation amount of the reference plane at this time is the screw-in depth of the first sealing surface boundary. The circular boundary where the reference surface and the second sealing surface first come into contact is regarded as the starting boundary of the second sealing surface. At this time, the translation amount of the reference surface is the screw-in depth of the boundary of the second sealing surface.

[0027] Step 3: Calculate the sealing width and sealing pressure of the first sealing surface; When the beam type pipe joint is in the installed state, the first sealing surface and the second sealing surface both form a sealing ring, and the other boundary of the sealing ring is defined as the termination boundary.

[0028] Taking the design parameters as variables, the relationship between the axial force on the first sealing surface and the deflection and rotation angle of the cantilever beam is derived.

[0029] According to the following conditions, the axial force when the first sealing surface is fully formed and the termination boundary of the first sealing surface are solved.

[0030] The condition for solving the axial force when the first sealing surface is fully formed is that the deflection of the cantilever beam is equal to the difference in the boundary screw-in depth between the first sealing surface and the second sealing surface.

[0031] The condition for determining the termination boundary of the first sealing surface is that the termination boundary angle is equal to the angle of the male connector end face. If the calculated termination boundary is within the second sealing surface interval, the intersection of interface 103 and sealing surface 104 is used as the actual termination boundary. If the calculated termination boundary is within the interface, the calculated termination boundary is used as the actual termination boundary. Within the interface refers to the interval bounded by the interface and close to the axis.

[0032] Based on the above conditions, the axial force and termination boundary of the first sealing surface are calculated.

[0033] The distance between the end boundary and the starting boundary of the first sealing surface is taken as the sealing width of the first sealing surface. The sealing area of ​​the first sealing surface can be obtained according to the sealing width of the first sealing surface.

[0034] The sealing pressure of the first sealing surface can be obtained based on the axial force and the sealing area of ​​the first seal; the sealing pressure is the quotient of the axial force and the sealing area.

[0035] Step 4: Calculate the sealing width and sealing pressure of the second sealing surface; Taking the design parameters as variables, the relationship between the axial force and the compression deformation of the second sealing surface is derived.

[0036] The relationship between the sealing diameters of the first sealing surface and the second sealing surface and the corresponding sealing widths is derived based on the geometric relationship.

[0037] According to the axial force of the second sealing surface and the sealing area of ​​the second sealing surface, a relationship formula of the sealing pressure of the second sealing surface is obtained.

[0038] Taking the optimal condition that the leakage rates of the first sealing surface and the second sealing surface are equal, substitute the relationship between the axial force and the compression deformation of the second sealing surface, the relationship between the sealing diameters and the corresponding sealing widths of the first and second sealing surfaces, the relationship between the sealing pressure of the second sealing surface, and the sealing width and sealing pressure of the first sealing surface in step 3 into the leakage rate formula to solve and obtain the sealing width of the second sealing surface; the sealing pressure of the second sealing surface can be calculated based on the sealing width.

[0039] Step 5: Calculate the installation torque; The total axial force is obtained by summing the products of the calculated sealing areas of the first sealing surface, the second sealing surface and the sealing pressure, and the installation torque can be calculated according to the engineering algorithm or the finite element method.

[0040] The implementation process of the beam-type pipe joint installation torque evaluation method of the present invention is described in detail below with reference to specific embodiments.

[0041] Step 1: Divide the two sealing surface areas on the female connector like Figure 1 As shown, the bottom plane of the rotary groove of the female connector is used as the dividing line, the distance between the dividing interface and the inner surface of the female connector is H, the first sealing surface interval is located inside the dividing interface, and the second sealing surface interval is located outside the dividing interface.

[0042] Step 2: Obtain the starting boundary and screw-in depth of the first sealing surface interval and the second sealing surface interval Take the male connector end face as the reference plane and translate it along the axis direction. Figure 2 , point A is the starting boundary of the first sealing surface, and the critical screw-in depth of the first sealing surface is L A ; Point B is the starting boundary of the second sealing surface, and the critical screw-in depth L of the second sealing surface is B .

[0043] Reference Figure 3 The design parameters of the female connector and the male connector include: h1 is the cantilever beam length, h2 is the outer plane width of the male connector, h3 is the inner plane width of the male connector, θ1 is the cantilever beam angle, and R is the cantilever beam rotation radius.

[0044] Reference Figure 2 , point A is the outer end point of the cantilever beam of the female joint, then the x coordinate of point B is: ... (1); The male connector angle is 90°. Substituting h1=1.4mm, h2=0.3mm, and θ1=80° into formula (1), we can get X B =1.1mm.

[0045] Step 3: Calculate the sealing width and sealing pressure of the first sealing surface Reference Figure 3 , with the cantilever beam height t, cantilever beam length h1, cantilever beam angle θ1, and cantilever beam rotation radius R as design parameters; establish a local coordinate system xoy, with the x-axis set along the length direction of the cantilever beam, and decompose the axial force F along the x-axis and y-axis into Fx and Fy. The coordinate system and force analysis are as follows Figure 4 shown.

[0046] available, ... (2); The cantilever beam is divided into variable thickness sections and constant thickness sections. The variable thickness sections and constant thickness sections are analyzed separately and then superimposed.

[0047] The calculation formula for the cantilever beam deflection can be expressed as: ... (3); in, is the second differential of the cantilever beam deflection, E is the elastic modulus of the cantilever beam material, and I is the moment of inertia of the cantilever beam, where the moment of inertia I is a function of x.

[0048] According to formula (3), formula (3) can be converted into: ... (4); in, represents the moment of inertia of the variable section, represents the constant moment of inertia, usually the maximum moment of inertia; and ……(5); ……(6).

[0049] In formula (4), The function of x is called the reduced bending moment and can be expressed as: ... (7); Therefore, formula (3) can be expressed as: ……(8).

[0050] In this way, the variable cross-section beam can be equivalent to a constant cross-section beam under the converted bending moment. Since the maximum normal stress caused by bending should be equal and constant on all cross-sections, according to the strength calculation formula: ... (9); The bending moment and section resistance to bending moment Substituting into formula (9), we can get: ... (10); According to formula (10), we can get: ……(11); According to formula (11), at the fixed end of the variable cross-section segment: … (12); By dividing (11) and (12), we can get: … (13); Substituting Equation (13) into (5), the moment of inertia of any cross section of the cantilever beam can be obtained as: ……(14).

[0051] Therefore, the deflection differential equation (4) can be expressed as: ……(15).

[0052] By integrating the left and right sides of Equation (15) once and twice, we can obtain the rotation angle equation and deflection equation of the variable thickness beam, which are: … (16); … (17); In formula (16) and (17), C1 and C2 are constants. When θ A =0,ω A =0, and substituting it into equations (16) and (17) we can obtain: ; .

[0053] Then the deflection equation of the variable thickness section of the cantilever beam is: … (18); The moment of inertia I0 of the equal thickness segment is expressed as: ……(19).

[0054] In this embodiment, the maximum deformation and rotation angle of the cantilever beam with equal thickness under concentrated force can be expressed as: … (20); ……(twenty one).

[0055] Substituting x = 0 into (18), and combining (19), (20), and (21), we can obtain the deflection ω of the cantilever end of the beam pipe joint: A for: ……(twenty two).

[0056] Simplifying formula (22) we can get: ……(twenty three).

[0057] Substituting equations (2) and (19) into (23), we can obtain: ……(twenty four).

[0058] In this embodiment, E = 110000 MPa, t = 0.8 mm, h1 = 1.4 mm, θ1 = 80°, R = 3.5 mm, and substituting into (24) yields: ω A =9.1e -6 F; According to step 2, ω A=X B =0.1mm; the axial force F=10930N, F y = 10763N; Substituting into formula (21), we can obtain the rotation angle θ of the equal thickness segment = 4.9°.

[0059] The male connector angle is 90°, which can obtain the angle θ of the variable thickness section. A =90°-80°-4.9°=5.1°, substituting into formula (16) we can get the value of x, h3=0.5mm, and we know that x>h3, which means that the extrusion pressure is large enough to make the first sealing surface range fully contacted.

[0060] Therefore, the termination boundary of the first sealing surface is located at the edge 21 of the rotary groove on the end face of the male connector. Since the calculated x value is greater than h3, the actual first sealing surface cannot exceed h3. At this time, the sealing width W1 of the first sealing surface = h3 = 0.5mm, and the sealing area S1 of the first sealing surface = 11mm 2 ; Get the sealing pressure σ of the first sealing surface m1 =979MPa.

[0061] Step 4: Calculate the sealing width and sealing pressure of the second sealing surface like Figure 5 As shown, the inclination angle of the male connector is 90°, the inclination angle of the female connector is 80°, and the compressed length is L.

[0062] The compression deformation of the beam-type pipe joint in the installed state is ΔL, the sealing width W2 of the second sealing surface, and the sealing area S2 can be expressed as: … (25); in, f To form the extrusion force of the second sealing surface; … (26); ……(27).

[0063] In this embodiment, the compression length is L = 1 mm. Substituting equations (26) and (27) into equation (25), we can obtain W2 = 2.3e -4 f 1 / 2 .

[0064] The leak rate formula is: … (28); Where D is the diameter of the sealing surface, H is the surface roughness, W is the sealing width, σ m is the sealing pressure on the sealing surface, Ks is the sealing performance coefficient, Δp is the pressure difference at both ends of the leak hole, R is the universal gas constant, T is the absolute temperature of the gas, M is the molecular mass of the gas, K is the shape correction coefficient, and α is the cone inclination angle. Take α=4°, then K =1.7.

[0065] H and K of the two sealing surfaces of beam type pipe joint s ,Δp,R,T,M are the same, D,W,σ m different.

[0066] Assume that the first seal is Q1, D1, W1, σ m1 , the second seal is Q2, D2, W2, σ m2 , we can get: … (29); Where D1 and D2 can be expressed as: … (30); … (31); We can get D1=7.98mm, W1=0.5mm, σ m1 =979MPa; Substituting equation (31) into equation (29), we can obtain that when Q1= Q2, the sealing width of the second sealing surface is W2=0.002mm, and the sealing pressure σ m2 =1262MPa.

[0067] Step 5: Calculate the installation torque According to the σ obtained in step 3 and step 4 m1 , σ m2 , S1, S2, the total axial force is calculated to be S1σ m1 + S2σ m1 =10842N.

[0068] In this embodiment, the thread specification of the male connector and the outer nut is MJ14×1.5. According to the engineering algorithm, the value of the installation torque can be obtained as 37 N·m.

[0069] On the other hand, the present invention also provides an application of a beam-type pipe joint installation torque evaluation method in the installation of a beam-type pipe joint.

[0070] In some embodiments, the parameters of the female joint, male joint and outer sleeve nut in the beam pipe joint are obtained to obtain the installation torque required for installing the beam pipe joint, and the beam pipe joint is installed according to the obtained installation torque. At this time, the sealing performance of the beam pipe joint can be well guaranteed, and structural damage caused by excessive installation torque during installation of the beam pipe joint can be avoided.

[0071] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. used to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0072] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of the present invention does not necessarily imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical" and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0073] It should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0074] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A method for evaluating the installation torque of a beam-type pipe joint, wherein the beam-type pipe joint comprises a female joint, a male joint, and a jacket nut, wherein the sealing end of the female joint is a rotary cantilever beam structure, characterized in that: The following steps are involved: Dividing the sealing end surface of the female connector into a first sealing surface area and a second sealing surface area; The sealing width of the first sealing surface is obtained according to the starting boundary and the ending boundary of the first sealing surface. The axial force of the first sealing surface is obtained according to the relationship between the axial force of the first sealing surface and the deflection and the rotation angle of the cantilever beam. The sealing pressure of the first sealing surface is obtained according to the axial force and the sealing width of the first sealing surface. According to the relationship between the axial force and the compression deformation of the second sealing surface, and the relationship between the sealing diameters and the corresponding sealing widths of the first and second sealing surfaces, the axial force and the sealing width of the second sealing surface are obtained, and the sealing pressure of the second sealing surface is obtained according to the axial force and the sealing width of the second sealing surface; The total axial force of the beam type pipe joint is obtained according to the sealing pressure and sealing area of ​​the first sealing surface and the second sealing surface, and the installation torque required for the sealing installation of the beam type pipe joint is obtained according to the total axial force.

2. The beam-type pipe joint installation torque evaluation method according to claim 1, characterized in that: The bottom plane or section of the female connector's rotary groove is used as the interface to divide the female connector's sealing surface into a first sealing surface and a second sealing surface, wherein the first sealing surface section is located within the interface and the second sealing surface section is located outside the interface.

3. The method for evaluating the installation torque of a beam type pipe joint according to claim 1, wherein: The sealing end face of the male connector is taken as the reference plane, the circular boundary where the reference plane first contacts the first sealing surface is taken as the starting boundary of the first sealing surface, and the translation amount of the current reference plane is taken as the critical screw-in depth of the first sealing surface; the circular boundary where the reference plane first contacts the second sealing surface is taken as the starting boundary of the second sealing surface, and the translation amount of the current reference plane is taken as the critical screw-in depth of the second sealing surface.

4. The method for evaluating the installation torque of a beam type pipe joint according to claim 1, wherein: Under the condition that the cantilever beam deflection is equal to the difference between the boundary screw-in depths of the first and second sealing surfaces, the axial force of the first sealing surface is obtained according to the relationship between the axial force of the first sealing surface and the cantilever beam deflection and rotation angle.

5. The method for evaluating the installation torque of a beam type pipe joint according to claim 1, wherein: The termination boundary of the first sealing surface is obtained under the condition that the termination boundary angle is equal to the angle of the male joint end face.

6. The method for evaluating the installation torque of a beam type pipe joint according to claim 5, wherein: When the calculated termination boundary is located in the second sealing surface interval, the intersection line of the interface and the sealing surface is used as the termination boundary of the first sealing surface; when the obtained termination boundary is within the interface, it is used as the actual termination boundary.

7. The method for evaluating the installation torque of a beam type pipe joint according to claim 1, wherein: Under the condition that the leakage rates of the first sealing surface and the second sealing surface are equal, the sealing width of the second sealing surface is obtained according to the relationship between the axial force and the compression deformation of the second sealing surface, the relationship between the sealing diameters and the corresponding sealing widths of the first and second sealing surfaces, the relationship between the sealing pressure of the second sealing surface, the sealing width and sealing pressure of the first sealing surface and the leakage rate formula, and the sealing pressure of the second sealing surface is obtained based on the sealing width.

8. Application of the beam pipe joint installation torque evaluation method according to any one of claims 1 to 7 in the installation of a beam pipe joint.

9. Application of the method for evaluating the installation moment of a beam-type pipe joint according to claim 8, characterized in that: Parameters of the female joint, the male joint, and the outer nut in the beam type pipe joint are obtained to obtain the installation torque required for installing the beam type pipe joint, and the beam type pipe joint is installed according to the obtained installation torque.

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