Pipeline joint structure connection sealing characteristic test device and method

Abstract

The invention belongs to the field of pipeline joint design, and particularly relates to a pipeline joint structure connection sealing characteristic test device and method, and the device comprises a pipeline male joint, a pipeline female joint, a pipe support, a clamp, and a film pressure sensor. The pipeline male joint and the pipeline female joint are coaxially and correspondingly arranged and are in conical surface connection; the pipe bracket is fixedly connected with the pipeline female joint and is not in direct contact with the pipeline male joint; by arranging the pipeline male connector, the pipeline female connector and a matching structure thereof and arranging the film pressure sensor between the pipeline male connector and the pipeline female connector, a pipeline connector connection pre-tightening load can be directly applied, errors caused by indirect adjustment by adopting thread tightening torque can be avoided, and the test parameter adjustment precision is improved; and the deformation / contact pressure of the sealing working surface is directly measured to obtain the closing degree of the sealing tape, so that the influence of the characteristics such as medium type and viscosity during indirect characterization through the medium leakage condition is avoided.

Description

Technical Field

[0001] The present invention relates to the field of pipeline joint design, and in particular to a test device and method for the connection and sealing characteristics of pipeline joint structures. Background Art

[0002] Pipe fittings are essential components in aircraft / engine oil and gas delivery systems. While mature, standardized optional components exist, the new generation of aircraft demands higher media pressures, reliability, and lightweighting, necessitating continuous exploration and innovation in pipe fitting design. Joint sealing performance, which refers to the relationship between joint design parameters (structural form, dimensions, assembly preload, etc.) and sealing performance parameters, is a crucial component of new pipe fitting design. Joint sealing performance testing is essential to verify these design parameters.

[0003] In piping system design, separate tests for the sealing properties of pipe joint structures are typically not conducted. Instead, pipeline connection components are directly subjected to media filling and pressure testing. Assembly preload is adjusted by thread tightening torque, and sealing performance is evaluated by the degree of media leakage. While this test can verify the sealing performance of pipeline components under test conditions, it presents the following issues when used to characterize the sealing properties of joint structures:

[0004] Affected by the friction state of each contact pair of the pipeline connection components, the accuracy of adjusting the preload by tightening torque is low, the test data is highly dispersed, and the repeatability is poor;

[0005] Due to the limitations of the test medium type, viscosity and other characteristics, the medium filling pressure test of the pipeline component cannot directly and quantitatively characterize the closing condition of the joint sealing tape under preload.

[0006] The current joint sealing performance test methods and test devices have the following shortcomings:

[0007] 1. Currently, there is no special test method for the sealing characteristics of pipe joint structures;

[0008] 2. The medium filling and pressure test of the pipeline connection assembly is used to characterize the connection and sealing characteristics of the joint structure. The following problems exist:

[0009] (1) Affected by the friction state of each contact pair of the pipeline connection components, the accuracy of adjusting the preload by tightening torque is low, the test data is highly dispersed, and the repeatability is poor;

[0010] (2) Due to the limitations of the test medium type, viscosity and other characteristics, the medium filling pressure test of the pipeline component cannot directly and quantitatively characterize the closing condition of the joint sealing tape under the preload.

[0011] Therefore, special tests on the sealing characteristics of pipe joint structures are needed to study the closing conditions of pipe joint sealing bands under preload, so as to support the design of pipe joint structural parameters and the evaluation of applicable scenarios. Summary of the Invention

[0012] The purpose of this application is to provide a pipeline joint structure connection sealing characteristics test device and method to solve the problems in the prior art of low test accuracy and difficulty in quantification for characterizing the connection sealing characteristics of joint structures.

[0013] The technical solution of the present application is: a pipeline joint structure connection sealing property test device, including a pipeline male joint, a pipeline female joint, a pipe support, a clamp and a thin film pressure sensor; the pipeline male joint and the pipeline female joint are coaxially arranged correspondingly, and the pipeline male joint and the pipeline female joint are conically connected; the pipe support is fixedly connected to the pipeline female joint and there is no direct contact between the pipe support and the pipeline male joint; the clamp is arranged on the outside of the pipe support and is clamped and fixed on the pipeline male joint; the thin film pressure sensor is arranged between the pipeline male joint and the pipeline female joint, and is used to measure the contact pressure of the sealing surface.

[0014] Preferably, the clamp comprises two connecting plates in an "Ω"-shaped structure, and the two connecting plates are interconnected on both sides by bolts.

[0015] As a specific embodiment, a method for testing the connection sealing characteristics of a pipe joint structure includes:

[0016] Determine the structure and size of the male and female pipe joints;

[0017] Determine the fixing method on the test bench and the required matching adapter structure based on the structure and size of the male and female pipe connectors;

[0018] Determine the loading device, the load amplitude of the loading device, and the matching connection structure between the loading device and the male and female pipe joints according to the structure and size of the pipe joints;

[0019] Install the test piece and tools on the test bench and assemble them according to the established installation sequence and the list of all required parts;

[0020] Carry out installation and commissioning of thin film pressure sensors and test systems, including installation and fixation of thin film pressure sensors, validity determination and calibration of data signals, and complete all calibrations before testing;

[0021] Conduct test loading and data collection: Specifically, a test load is applied to one end connector, and the deformation / contact pressure of the sealing surface of the male and female connectors of the pipeline is extracted through a thin film pressure sensor;

[0022] The test data is processed and the corresponding functional relationship is established for the changes in load and deformation / contact pressure to characterize the connection and sealing characteristics of the pipeline joint structure.

[0023] Preferably, the specific method for determining the effectiveness of the thin film pressure sensor is:

[0024] In the no-pressure state, check whether the output of the thin film pressure sensor is close to zero. If so, apply the same pressure to the thin film pressure sensor multiple times and calculate the coefficient of variation of the output value. When the coefficient of variation is less than the set value, it is judged that the repeatability meets the requirements; apply different pressures to the thin film pressure sensor, collect the pressure signal, and judge whether the pressure signal has noise, drift, or nonlinear mutation. If not, it is judged that the effectiveness of the thin film pressure sensor meets the requirements.

[0025] Preferably, when the thin film pressure sensor does not meet the validity requirement, the position of the thin film pressure sensor is adjusted and re-determination is performed until the validity requirement is met.

[0026] Preferably, the corresponding functional relationship between the load F and the deformation / contact pressure P is:

[0027] Contact radius

[0028] Maximum contact pressure

[0029] Where R is the equivalent radius of curvature, E * is the equivalent elastic modulus.

[0030] The pipeline joint structure connection sealing characteristics test device and method of the present application, by setting a pipeline male joint and a pipeline female joint and their matching structure, and setting a thin film pressure sensor between the two, can directly apply the pipeline joint connection pre-tightening load, thereby avoiding the error caused by indirect adjustment of the thread tightening torque, and improving the adjustment accuracy of the test parameters; directly measure the deformation / contact pressure of the sealing working surface to obtain the degree of sealing belt closure, avoiding the influence of medium type, viscosity and other characteristics when indirectly characterizing through medium leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions provided by this application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of this application.

[0032] Figure 1 This is a schematic diagram of the overall structure of this application;

[0033] Figure 2 This is a schematic diagram of the overall process of this application.

[0034] 1. Pipe male connector; 2. Pipe female connector; 3. Pipe support; 4. Clamp; 5. Thin film pressure sensor. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] A pipe joint structure connection sealing property test device, such as Figure 1 The apparatus comprises a male pipe connector 1, a female pipe connector 2, a pipe support 3, a clamp 4, and a thin film pressure sensor 5. The male pipe connector 1 and the female pipe connector 2 are coaxially arranged, and the male pipe connector 1 and the female pipe connector 2 are connected by a conical surface to achieve a reliable seal. The pipe support 3 is fixedly connected to the female pipe connector 2 and has no direct contact with the male pipe connector 1. The clamp 4 is located outside the pipe support 3 and is clamped and fixed to the male pipe connector 1. The thin film pressure sensor 5 is located between the male pipe connector 1 and the female pipe connector 2 and is used to measure the contact pressure of the sealing surface.

[0037] Thin-film pressure sensors 5 can directly measure the deformation and contact pressure of the sealing surface to determine the degree of sealing band closure, avoiding the influence of medium type, viscosity, and other characteristics that would be used to indirectly characterize leakage. This type of sensor does not alter the contact environment of the contact surface and can directly measure the contact stress and the resultant force of each sensing element within the contact surface, facilitating direct measurement of pressure distribution patterns on the sealing surface of pipeline joints.

[0038] The fixture 4 comprises two Ω-shaped connecting plates, interconnected by bolts on both sides. This reverse assembly of the bolts allows for reliable installation, improves the versatility and interchangeability of the test device components, and helps control testing costs.

[0039] The clamping length and outer diameter of the pipe male connector 1 can be customized according to the size of the testing machine chuck.

[0040] Before the test, the components are assembled according to the above connection relationship, and the matching surfaces of the pipe female connector 2 and the pipe support 3, as well as the matching surfaces of the pipe male connector 1 and the pipe female connector 2, are used to align the three. The connecting thread between the pipe male connector 1 and the pipe support 3 is eliminated, so that the pipe joint connection pre-tightening load is directly applied to the pipe male connector 1, which can avoid the error caused by indirect adjustment of the thread tightening torque and improve the adjustment accuracy of the test parameters.

[0041] During the test, the vertical position of the testing machine chuck needs to be fine-tuned to eliminate the axial clearance between the pipe joints, so that the initial contact force at the start of the test does not exceed 50 N. This ensures that the two are in contact before the test, but the contact deformation is very small and can basically be ignored.

[0042] The test load is achieved through displacement loading. The displacement is related to the specific structural form of the pipe joint and is generally less than 0.05mm. The loading rate is controlled accordingly and generally does not exceed 0.005mm / min.

[0043] As a specific embodiment, a method for testing the sealing characteristics of a pipe joint structure is also included, using the above-mentioned test device, such as Figure 2 , specifically including the following steps:

[0044] Step 1, determine the structure and size of the pipeline male connector 1 and the pipeline female connector 2;

[0045] Step 2: Determine the fixing method on the test bench and the required matching adapter structure based on the structure and size of the pipeline male connector 1 and the pipeline female connector 2;

[0046] Step 3: Determine the loading device, the load amplitude of the loading device, and the matching connection structure between the loading device and the pipe male connector 1 and the pipe female connector 2 according to the structure and size of the pipe male connector 1 and the pipe female connector 2.

[0047] Step 4: Install the test piece and tools on the test bench and assemble them according to the established installation sequence and the list of all required components.

[0048] Step 5 is to install and debug the thin film pressure sensor 5 and the test system, including the installation and fixation of the thin film pressure sensor 5, the validity determination and calibration of the data signal, and complete all calibrations before the test.

[0049] Preferably, the specific method for determining the effectiveness of the thin film pressure sensor 5 is:

[0050] In a pressure-free state, check whether the output of the thin film pressure sensor 5 is close to zero. If so, apply the same pressure to the thin film pressure sensor 5 multiple times, calculate the coefficient of variation of the output value, and when the coefficient of variation is less than the set value, judge that the repeatability meets the requirements; apply different pressures to the thin film pressure sensor 5, collect pressure signals, and judge whether the pressure signal has noise, drift, or nonlinear mutation. If not, judge that the effectiveness of the thin film pressure sensor 5 meets the requirements.

[0051] When the thin film pressure sensor 5 does not meet the validity requirement, the position of the thin film pressure sensor 5 is adjusted and re-determination is performed until the validity requirement is met.

[0052] Step 6, test loading and data collection: specifically, applying a test load to one end connector, and extracting the deformation / contact pressure of the sealing surfaces of the pipeline male connector 1 and the pipeline female connector 2 through the film pressure sensor 5.

[0053] Step 7: Process the test data and establish a corresponding functional relationship based on the changes in load and deformation / contact pressure to characterize the connection and sealing characteristics of the pipeline joint structure.

[0054] Preferably, the corresponding functional relationship between load F and deformation / contact pressure P is:

[0055] Contact radius

[0056] Maximum contact pressure

[0057] Where R is the equivalent radius of curvature, E * is the equivalent elastic modulus (1 / E * =1 / E1+1 / E2);

[0058] To sum up, this application sets a pipe male joint and a pipe female joint and their matching structure, and sets a thin film pressure sensor between the two, which can directly apply the pipe joint connection pre-tightening load, avoid the error caused by indirect adjustment of the thread tightening torque, and improve the adjustment accuracy of the test parameters; directly measure the deformation / contact pressure of the sealing working surface to obtain the degree of closure of the sealing belt, and avoid the influence of medium type, viscosity and other characteristics when indirectly characterizing through medium leakage.

[0059] Finally, it should be noted that the drawings of the embodiments disclosed in the present invention only involve structures related to the embodiments disclosed in the present invention. Other structures can refer to common designs. In the absence of conflicts, the same embodiment and different embodiments of the present invention can be combined with each other.

[0060] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A pipe joint structure connection sealing property test device, characterized by: The invention comprises a pipeline male connector (1), a pipeline female connector (2), a pipe support (3), a clamp (4) and a thin film pressure sensor (5); the pipeline male connector (1) and the pipeline female connector (2) are coaxially arranged, and the pipeline male connector (1) and the pipeline female connector (2) are connected by conical surfaces; the pipe support (3) is fixedly connected to the pipeline female connector (2) and the pipe support (3) and the pipeline male connector (1) have no direct contact; the clamp (4) is arranged on the outside of the pipe support (3) and is clamped and fixed on the pipeline male connector (1); the thin film pressure sensor (5) is arranged between the pipeline male connector (1) and the pipeline female connector (2) and is used to measure the contact pressure of the sealing surface.

2. The pipe joint structure connection sealing property testing device according to claim 1, characterized in that: The clamp (4) comprises two connecting plates in an "Ω"-shaped structure, and the two sides of the two connecting plates are interconnected by bolts.

3. A method for testing the sealing properties of a pipe joint structure, using the device according to any one of claims 1-2, characterized in that: include: Determine the structure and size of the pipeline male connector (1) and the pipeline female connector (2); Determine the fixing method on the test bench and the required matching adapter structure according to the structure and size of the pipeline male connector (1) and the pipeline female connector (2); Determining the loading device, the load amplitude of the loading device, and the matching connection structure between the loading device and the pipeline male connector (1) and the pipeline female connector (2) according to the structure and size of the pipeline male connector (1) and the pipeline female connector (2); Install the test piece and tools on the test bench and assemble them according to the established installation sequence and the list of all required parts; Perform installation and debugging of the thin film pressure sensor (5) and the test system, including installation and fixation of the thin film pressure sensor (5), validity determination and calibration of the data signal, and complete all calibrations before the test; Conducting test loading and data collection: Specifically, applying a test load to one end joint, and extracting the deformation / contact pressure of the sealing surface of the pipeline male joint (1) and the pipeline female joint (2) through a thin film pressure sensor (5); The test data is processed and the corresponding functional relationship is established for the changes in load and deformation / contact pressure to characterize the connection and sealing characteristics of the pipeline joint structure.

4. The method for testing the sealing properties of a pipe joint structure according to claim 3, wherein: The specific method for determining the effectiveness of the thin film pressure sensor (5) is as follows: In a pressure-free state, check whether the output of the thin film pressure sensor (5) is close to zero. If so, apply the same pressure to the thin film pressure sensor (5) multiple times, calculate the coefficient of variation of the output value, and when the coefficient of variation is less than the set value, judge that the repeatability meets the requirements; apply different pressures to the thin film pressure sensor (5), collect pressure signals, and judge whether the pressure signal has noise, drift, or nonlinear mutation. If not, judge that the effectiveness of the thin film pressure sensor (5) meets the requirements.

5. The method for testing the sealing properties of a pipe joint structure according to claim 4, wherein: When the film pressure sensor (5) does not meet the validity requirement, the position of the film pressure sensor (5) is adjusted and re-judgment is performed until the validity requirement is met.

6. The method for testing the sealing properties of a pipe joint structure according to claim 3, wherein: The corresponding functional relationship between the load F and the deformation / contact pressure P is: Contact radius Maximum contact pressure Where R is the equivalent radius of curvature, E * is the equivalent elastic modulus.

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