Beam pipe joint installation torque evaluation method and application

Abstract

The application discloses a beam type pipe joint installation torque evaluation method and application, and divides the sealing end face of a female joint into a first sealing surface interval and a second sealing surface interval; the sealing pressure of the first sealing surface is obtained according to the axial force and the sealing width of the first sealing surface; 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 the 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. 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 ensured, and the damage of the structure caused by the excessively large installation torque during the installation of the beam type pipe joint can be avoided.

Description

Technical Field

[0001] This invention belongs to the field of beam pipe joint installation technology, specifically relating to a method for evaluating the installation torque of beam pipe joints and its application. Background Technology

[0002] With the improvement of aircraft performance, aviation hydraulic pipe fittings are constantly developing towards higher pressure and lighter weight. As a basic hydraulic accessory, aviation hydraulic pipe fittings must not only withstand high and low temperatures and high frequency vibrations from the outside environment, but also withstand the pulsating impact of fluid inside the fitting. Furthermore, they have high requirements for connection strength, sealing performance, and fatigue resistance. Failure at any point in the pipeline connection will seriously affect the safety of the system, and the pipe connection joint is often the weakest point in the entire system, operating in extremely harsh environments.

[0003] Beam-type pipe fittings, as one of the advanced aerospace pipe fittings, are widely used in aerospace hydraulic piping systems. The installation torque of beam-type pipe fittings is a key indicator for ensuring their sealing performance and reliability. Inappropriate installation torque can lead to pipe leakage, damage, and reduced lifespan, severely impacting the engineering application of beam-type pipe fittings. Currently, this performance indicator of installation torque for beam-type pipe fittings can only be obtained through extensive testing, which requires significant resources and time, resulting in high costs and low efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a method and application for evaluating the installation torque of beam-type pipe joints, so as to solve the problem of determining the installation torque of beam-type pipe joints through experiments.

[0005] This invention is achieved through the following technical solution:

[0006] 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 connector, and an outer nut, and the sealing end of the female joint is a rotary cantilever beam structure, comprising the following steps:

[0007] The sealing end face of the female connector is divided into the first sealing surface section and the second sealing surface section.

[0008] The sealing width of the first sealing surface is obtained from the starting and ending boundaries of the first sealing surface. The axial force of the first sealing surface is obtained from the relationship between the axial force of the first sealing surface and the deflection and rotation angle of the cantilever beam. The sealing pressure of the first sealing surface is obtained from the axial force and sealing width of the first sealing surface.

[0009] Based on the relationship between the axial force and the amount of compression deformation of the second sealing surface, and the relationship between the sealing diameter and the corresponding sealing width of the first and second sealing surfaces, the axial force and sealing width of the second sealing surface are obtained, and the sealing pressure of the second sealing surface is obtained based on the axial force and sealing width of the second sealing surface.

[0010] The total axial force of the beam pipe joint is obtained based on the sealing pressure and sealing area of ​​the first and second sealing surfaces, and the installation torque required for sealing the beam pipe joint is obtained based on the total axial force.

[0011] 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's rotary groove as the interface. The first sealing surface is located within the interface, and the second sealing surface is located outside the interface.

[0012] In some embodiments, the sealing end face of the male connector is used as the reference surface, the circular boundary that first contacts the reference surface with the first sealing surface is taken as the starting boundary of the first sealing surface, and the translation amount of the current reference surface is taken as the critical screw-in depth of the first sealing surface; the circular boundary that first contacts the reference surface with the second sealing surface is taken as the starting boundary of the second sealing surface, and the translation amount of the current reference surface is taken as the critical screw-in depth of the second sealing surface.

[0013] In some embodiments, the axial force of the first sealing surface is obtained based on the relationship between the axial force of the first sealing surface and the deflection and rotation angle of the cantilever beam, provided that the difference between the cantilever beam deflection and the boundary screw-in depth of the first and second sealing surfaces is equal.

[0014] 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 male connector end face angle.

[0015] In some embodiments, when the calculated termination boundary is located within the second sealing surface region, the intersection of the interface and the sealing surface is taken as the termination boundary of the first sealing surface; when the calculated termination boundary is within the interface, it is taken as the actual termination boundary.

[0016] In some embodiments, assuming 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 based on the relationship between the axial force and the amount of compression deformation of the second sealing surface, the relationship between the sealing diameter and the corresponding sealing width 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. The sealing pressure of the second sealing surface is then obtained based on the sealing width.

[0017] On the other hand, the present invention also provides an application of the beam pipe joint installation torque evaluation method in the installation of beam pipe joints.

[0018] In some embodiments, the parameters of the female connector, male connector, and outer nut in the beam-type pipe joint are obtained to obtain the installation torque required for the installation of the beam-type pipe joint, and the beam-type pipe joint is installed according to the obtained installation torque.

[0019] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0020] Based on the sealing structure characteristics of beam-type pipe joints, this invention divides the sealing surface of the female joint into two sealing surfaces. According to the geometric relationship of parameters such as axial force and 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 extensive testing, which can effectively ensure the sealing performance of the beam-type pipe joint and avoid structural damage caused by excessive installation torque during installation. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram showing the division of the two sealing surface sections on the female connector in an embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of the starting boundary of the two sealing surfaces and the critical axial screw-in depth in an embodiment of the present invention.

[0024] Figure 3 These are the design parameters for the female and male connectors in this embodiment of the invention.

[0025] Figure 4 This is a schematic diagram of the stress analysis of the cantilever beam of the female connector in an embodiment of the present invention.

[0026] Figure 5 This is a schematic diagram of the pressure length of the second sealing surface in an embodiment of the present invention.

[0027] in:

[0028] 10. Female connector; 11. Cantilever beam; 12. Rotary groove; 101. First sealing surface area; 102. Second sealing surface area; 103. Interface; 104. Sealing surface.

[0029] 20. Male connector; 21. Edge of the rotary groove on the end face of the male connector. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0031] Reference Figure 1 The beam-type pipe joint consists of a female connector 10, a male connector 20, and an outer nut. The female connector is a structural component with a rotating cantilever beam 11, the male connector is a structural component with an external thread structure that connects to the outer nut, and the outer nut is a structural component with an internal thread structure that connects to the male connector.

[0032] The structure of this beam-type pipe joint can refer to the structure disclosed in patent document CN116734055A. The outer nut is sleeved on the female joint and rotates between one end of the outer nut and the female joint. The other end of the outer nut is connected to the external thread of the male joint through the internal thread. In this way, when the outer 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 can be pressed together to form a sealing fit.

[0033] To address the structure of this type of beam-type pipe joint, this invention proposes a method for evaluating the installation torque of the beam-type pipe joint, in order to obtain the installation torque of the beam-type pipe joint and guide its installation; the method includes the following steps:

[0034] Step 1: Divide the first sealing surface section 101 and the second sealing surface section 102;

[0035] Using the bottom plane or cross-section of the female connector rotary groove 12 as the interface, the sealing surface 104 of the female connector is divided into a first sealing surface and a second sealing surface, wherein the first sealing surface section is located inside the interface and the second sealing surface section is located outside the interface.

[0036] Step 2: Obtain the starting boundaries and critical screw-in depths of the first sealing surface section and the second sealing surface section;

[0037] Using the male connector end face as the reference plane, translate it along the axial direction. The circular boundary that first contacts the reference plane with the first sealing surface is the starting boundary of the first sealing surface. At this time, the translation amount of the reference plane is the screw-in depth of the first sealing surface boundary.

[0038] The circular boundary where the reference surface and the second sealing surface first come into contact is taken 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 second sealing surface boundary.

[0039] Step 3: Calculate the sealing width and sealing pressure of the first sealing surface;

[0040] When the beam-type pipe joint is installed, both the first and second sealing surfaces form a sealing ring, and the other boundary of the sealing ring is defined as the termination boundary.

[0041] Using design parameters as variables, the relationship between the axial force of the first sealing surface and the deflection and rotation angle of the cantilever beam is derived.

[0042] Determine the axial force when the first sealing surface is fully formed and the termination boundary of the first sealing surface based on the following conditions.

[0043] 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 indentation depth at the boundary of the first and second sealing surfaces.

[0044] 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 area, the intersection of interface 103 and sealing surface 104 is taken as the actual termination boundary; if the calculated termination boundary is within the interface, then the calculated termination boundary is taken as the actual termination boundary. "Within the interface" refers to the area close to the axis, with the interface as the boundary.

[0045] Based on the above conditions, the axial force and termination boundary of the first sealing surface are calculated.

[0046] The distance between the termination 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 from the sealing width of the first sealing surface.

[0047] Based on the axial force and sealing area of ​​the first seal, the sealing pressure of the first sealing surface can be obtained; the sealing pressure is the quotient of the axial force and the sealing area.

[0048] Step 4: Calculate the sealing width and sealing pressure of the second sealing surface;

[0049] Using design parameters as variables, the relationship between the axial force and the amount of compressive deformation of the second sealing surface is derived.

[0050] Based on geometric relationships, the relationship between the sealing diameter and the corresponding sealing width of the first sealing surface and the second sealing surface is derived.

[0051] The relationship between the axial force of the second sealing surface and the sealing area of ​​the second sealing surface is obtained.

[0052] Assuming the optimal leakage rates for the first and second sealing surfaces are equal, the following formulas are used to calculate the leakage rate: the relationship between the axial force and compressive deformation of the second sealing surface, the relationship between the sealing diameter and corresponding sealing width 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 from step 3. The sealing width of the second sealing surface is then obtained. The sealing pressure of the second sealing surface can be calculated based on the sealing width.

[0053] Step 5: Calculate the installation torque;

[0054] The total axial force is obtained by summing the products of the sealing areas and sealing pressures of the first and second sealing surfaces, and the installation torque can be calculated using engineering algorithms or the finite element method.

[0055] The implementation process of the beam-type pipe joint installation torque evaluation method of the present invention will be described in detail below with reference to specific embodiments.

[0056] Step 1: Divide the two sealing surface sections on the female connector.

[0057] like Figure 1 As shown, the bottom plane of the female connector's rotary groove is the dividing line, and the distance between the interface and the inner surface of the female connector is H. The first sealing surface section is located inside the interface, and the second sealing surface section is located outside the interface.

[0058] Step 2: Obtain the starting boundaries and screw-in depth of the first sealing surface section and the second sealing surface section.

[0059] Using the male connector end face as a reference plane, translate it along the axial direction, referring to... 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 ;

[0060] 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 .

[0061] Reference Figure 3 The design parameters for the female and male connectors include: h1 is the length of the cantilever beam, h2 is the width of the outer plane of the male connector, h3 is the width of the inner plane of the male connector, θ1 is the angle of the cantilever beam, and R is the radius of rotation of the cantilever beam.

[0062] Reference Figure 2 Point A is located at the outer end point of the cantilever beam with female joint. Then the x-coordinate of point B is:

[0063] ...(1);

[0064] The male connector angle is 90°. Substituting h1=1.4mm, h2=0.3mm, and θ1=80° into formula (1), we can obtain X. B =1.1mm.

[0065] Step 3: Calculate the sealing width and sealing pressure of the first sealing surface.

[0066] Reference Figure 3 The design parameters are: cantilever beam height t, cantilever beam length h1, cantilever beam angle θ1, and cantilever beam radius of gyration R. A local coordinate system xoy is established, with the x-axis set along the length of the cantilever beam. The axial force F is decomposed into Fx and Fy along the x and y axes. The coordinate system and force analysis are as follows: Figure 4 As shown.

[0067] available, ...(2);

[0068] The cantilever beam is divided into variable thickness segments and constant thickness segments. The variable thickness segments and constant thickness segments are analyzed separately and then superimposed.

[0069] The formula for calculating the deflection of a cantilever beam can be expressed as:

[0070] ... (3);

[0071] in, Let E be the second derivative of the cantilever beam deflection, E be the elastic modulus of the cantilever beam material, and I be the moment of inertia of the cantilever beam, which is a function of x.

[0072] According to equation (3), equation (3) can be transformed into:

[0073] ... (4);

[0074] in, Represents the moment of inertia of a variable cross-section. Represents a constant moment of inertia, usually the maximum moment of inertia;

[0075] and ... (5);

[0076] ... (6).

[0077] In equation (4), The moment that is a function of x is called the reduced bending moment, and can be expressed as:

[0078] ... (7);

[0079] Therefore, equation (3) can be expressed as:

[0080] ... (8).

[0081] This allows the variable cross-section beam to be equivalent to a beam with a constant cross-section under the equivalent bending moment. Since the maximum normal stress caused by bending should be a constant equal to that on all cross-sections, according to the strength calculation formula:

[0082] ... (9);

[0083] bending moment and cross section resisting bending moment Substituting into equation (9), we get:

[0084] ... (10);

[0085] The result is obtained according to equation (10):

[0086] ... (11);

[0087] According to equation (11), at the fixed end of the variable cross-section section:

[0088] ... (12);

[0089] By dividing equations (11) and (12), we can obtain:

[0090] ... (13);

[0091] Substituting equation (13) into (5), we can obtain the moment of inertia of any section of the cantilever beam as follows:

[0092] ... (14).

[0093] Therefore, the deflection differential equation (4) can be expressed as:

[0094] ... (15).

[0095] Integrating equation (15) once and twice yields the rotation angle equation and deflection equation for the variable thickness beam, respectively:

[0096] ... (16);

[0097] ... (17);

[0098] In equations (16) and (17), C1 and C2 are constants, when When, θ A =0、ω A =0, substituting into equations (16) and (17) yields:

[0099] ; .

[0100] The deflection equation for the variable thickness section of the cantilever beam is:

[0101] ... (18);

[0102] The moment of inertia I0 of a uniform thickness segment is expressed as:

[0103] ... (19).

[0104] In this embodiment, the maximum deformation and rotation angle of the cantilever beam with equal thickness under concentrated force can be expressed as follows:

[0105] ... (20);

[0106] ……(twenty one).

[0107] Substituting x=0 into (18), and combining equations (19), (20), and (21), we can obtain the deflection ω at the cantilever end of the beam-type pipe joint. A for:

[0108] ……(twenty two).

[0109] Simplifying equation (22) yields:

[0110] ……(twenty three).

[0111] Substituting equations (2) and (19) into equation (23) yields:

[0112] ……(twenty four).

[0113] In this embodiment, E=110000MPa, t=0.8mm, h1=1.4mm, θ1=80°, R=3.5mm. Substituting these values ​​into (24), we get: ω A =9.1e -6 F;

[0114] According to step 2, ω A =X B =0.1mm; the axial force F can be calculated as 10930N, F y = 10763N;

[0115] Substituting into equation (21), we can obtain the rotation angle θ = 4.9° for the section with uniform thickness.

[0116] With the male connector angle at 90°, the rotation angle θ of the variable thickness section can be obtained. A =90°-80°-4.9°=5.1°, substituting into equation (16) yields the value of x, h3=0.5mm, indicating that x>h3, which means that the extrusion pressure is large enough to ensure that the first sealing surface area is in complete contact.

[0117] Therefore, the termination boundary of the first sealing surface is located at the edge 21 of the rotary groove on the male connector end face. Since the calculated x value is greater than h3, the actual first sealing surface cannot exceed h3. At this time, the sealing width W1 = h3 = 0.5 mm, and the sealing area S1 = 11 mm². 2 ;

[0118] The sealing pressure σ of the first sealing surface is obtained. m1 =979MPa.

[0119] Step 4: Calculate the sealing width and sealing pressure of the second sealing surface.

[0120] like Figure 5 As shown, the male connector has an inclination angle of 90°, the female connector has an inclination angle of 80°, and the pressure-bearing length is L.

[0121] The compression deformation ΔL of the beam-type pipe joint in the installed state, the sealing width W2 of the second sealing surface, and the sealing area S2 can be expressed as follows:

[0122] ... (25);

[0123] in, f The compressive force required to form the second sealing surface;

[0124] ... (26);

[0125] ... (27).

[0126] In this embodiment, the compression length is L=1mm. Substituting equations (26) and (27) into equation (25), we can obtain W2=2.3e. -4 f 1 / 2 .

[0127] The leakage rate formula is:

[0128] ... (28);

[0129] In the formula, D is the diameter of the sealing surface, H is the surface roughness, W is the sealing width, and σ m K represents the sealing pressure on the sealing surface. sHere, Δp is the sealing performance coefficient, R is the pressure difference across the leak, T is the absolute temperature of the gas, and M represents the molecular mass of the gas. K Here, α is the shape correction factor, and α is the cone inclination angle. Let α = 4°. K =1.7.

[0130] H and K of the two sealing surfaces of the beam pipe joint s Δp, R, T, and M are the same, D, W, and σ are the same. m different.

[0131] Let the first seal be Q1, D1, W1, σ. m1 The second seal is Q2, D2, W2, σ. m2 Then we can get:

[0132] ... (29);

[0133] In the formula, D1 and D2 can be expressed as:

[0134] ... (30);

[0135] ... (31);

[0136] We can obtain D1=7.98mm, W1=0.5mm, σ m1 =979MPa;

[0137] Substituting equation (31) into equation (29), we can obtain that when Q1 = Q2, the sealing width W2 of the second sealing surface is 0.002 mm, and the sealing pressure σ m2 =1262MPa.

[0138] Step 5: Calculate the installation torque

[0139] Based on σ obtained in steps 3 and 4 m1 σ m2 S1 and S2, the total axial force is calculated to be S1σ. m1 + S2σ m1 =10842N.

[0140] In this embodiment, the thread specification of the male connector and the outer nut is MJ14×1.5, and the installation torque value can be obtained as 37 N·m according to the engineering algorithm.

[0141] On the other hand, the present invention also provides the application of the beam pipe joint installation torque evaluation method in the installation of beam pipe joints.

[0142] In some embodiments, the parameters of the female connector, male connector, and outer nut in the beam pipe joint are obtained to obtain the installation torque required for the beam pipe joint installation. The beam pipe joint is installed according to the obtained installation torque. This can ensure the sealing performance of the beam pipe joint and avoid structural damage caused by excessive installation torque during the installation of the beam pipe joint.

[0143] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., used to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of this invention is usually placed in during use. They are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0144] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of this invention does not imply that the components are required to be absolutely horizontal or suspended, but rather that they 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 can be slightly tilted.

[0145] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention in light of the specific circumstances.

[0146] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope 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 includes a female joint, a male connector, and an outer nut, and the sealing end of the female joint is a rotary cantilever beam structure, characterized in that... Includes the following steps: The sealing end face of the female connector is divided into the first sealing surface section and the second sealing surface section. The sealing width of the first sealing surface is obtained from the starting and ending boundaries of the first sealing surface. The axial force of the first sealing surface is obtained from the relationship between the axial force of the first sealing surface and the deflection and rotation angle of the cantilever beam. The sealing pressure of the first sealing surface is obtained from the axial force and sealing width of the first sealing surface. Based on the relationship between the axial force and the amount of compression deformation of the second sealing surface, and the relationship between the sealing diameter and the corresponding sealing width of the first and second sealing surfaces, the axial force and sealing width of the second sealing surface are obtained, and the sealing pressure of the second sealing surface is obtained based on the axial force and sealing width of the second sealing surface. The total axial force of the beam pipe joint is obtained based on the sealing pressure and sealing area of ​​the first and second sealing surfaces, and the installation torque required for sealing the beam pipe joint is obtained based on the total axial force. Using the sealing end face of the male connector 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. The axial force of the first sealing surface is obtained based on 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 deflection of the cantilever beam is equal to the difference in the screw-in depth of the first sealing surface and the boundary of the second sealing surface. Assuming that the leakage rates of the first and second sealing surfaces are equal, the sealing width of the second sealing surface is obtained based on the relationship between the axial force and compressive deformation of the second sealing surface, the relationship between the sealing diameter and corresponding sealing width 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. The sealing pressure of the second sealing surface is then obtained based on the sealing width.

2. The method for evaluating the installation torque of beam-type pipe joints according to claim 1, characterized in that, Using the bottom plane or cross-section of the female connector's rotary groove as the interface, the sealing surface of the female connector is divided into a first sealing surface and a second sealing surface, wherein the first sealing surface section is located inside the interface and the second sealing surface section is located outside the interface.

3. The method for evaluating the installation torque of beam-type pipe joints according to claim 1, characterized in that, The termination boundary of the first sealing surface is obtained under the condition that the termination boundary angle is equal to the male connector end face angle.

4. The method for evaluating the installation torque of beam-type pipe joints according to claim 3, characterized in that, When the calculated termination boundary is located within the second sealing surface area, the intersection of the interface and the sealing surface is taken as the termination boundary of the first sealing surface; when the calculated termination boundary is within the interface, it is taken as the actual termination boundary.

5. The application of the beam-type pipe joint installation torque evaluation method according to any one of claims 1-4 in the installation of beam-type pipe joints.

6. The application of the beam-type pipe joint installation torque evaluation method according to claim 5, characterized in that, Obtain the parameters of the female connector, male connector, and outer nut in the beam-type pipe joint to obtain the installation torque required for the beam-type pipe joint installation, and then install the beam-type pipe joint according to the obtained installation torque.

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