A method for mechanical seal wear and leakage analysis with surface micro-texture

Abstract

The present disclosure relates to the technical field of aero-engine sealing design, and particularly provides a mechanical seal wear and leakage analysis method with a surface micro-texture, which comprises the following steps: S1, performing a friction and wear experiment to obtain a friction coefficient and a wear rate; S2, calculating a friction coefficient and a load bearing coefficient of a mechanical seal end face under given working condition parameters and surface micro-texture parameters; S3, calculating a steady-state value of a dissipation coefficient; and S4, calculating a wear amount and a leakage amount. The present disclosure can evaluate the wear amount and the leakage amount of the mechanical seal end face under different micro-texture surfaces and different working conditions, and has high universality and engineering applicability.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of aero-engine sealing design, and particularly to a mechanical seal wear and leakage analysis method with surface micro-texture. BACKGROUND

[0002] The friction state of the mechanical seal of the aero-engine oil cavity is extremely complex, and the domestic understanding of the friction and wear mechanism of the mechanical seal of the oil cavity is insufficient. There is a lack of mechanical seal friction and wear and leakage performance analysis tools, and breakthroughs have not been made in suppressing seal wear, reducing oil leakage failure rate and prolonging seal life. Therefore, it is necessary to study the analysis method for the wear and leakage of the mechanical seal of the aero-engine oil cavity, and to develop the performance evaluation capability of the mechanical seal and its surface micro-texture.

[0003] The lubrication state of the mechanical seal end face of the aero-engine oil cavity is very complex, and may experience dry friction, oil-gas mixed lubrication, pure fluid lubrication or coexistence of multiple lubrication states. The friction and wear mode and mechanism of the mechanical seal under the coupling of multiple fields, multiple phases and multiple flow states are very complex. There are hundreds of wear quantification models, but so far there is no universally recognized general wear quantification model in the tribology field.

[0004] In view of the above, how to calculate the wear and leakage of the mechanical seal with surface micro-texture is one of the important problems to be solved in the field. SUMMARY

[0005] The present disclosure is proposed in view of the above problems. The present disclosure provides a mechanical seal wear and leakage analysis method with surface micro-texture.

[0006] According to one aspect of the present disclosure, a mechanical seal wear and leakage analysis method with surface micro-texture is provided, comprising the following steps:

[0007] S1, performing a friction and wear experiment to obtain a friction coefficient and a wear rate;

[0008] S2, calculating the friction coefficient and the bearing coefficient of the mechanical seal end face under given working condition parameters and surface micro-texture parameters;

[0009] S3, calculating the steady-state value of the dissipation coefficient;

[0010] S4, calculating the wear amount and the leakage amount.

[0011] According to the mechanical seal wear and leakage analysis method with surface micro-texture according to one aspect of the present disclosure, step S1 comprises:

[0012] S11, using a friction and wear tester to perform tribological test measurement on the mechanical seal counterpart material;

[0013] S12, determining the maximum friction coefficient and the minimum friction coefficient;

[0014] S13, selecting multiple measuring points under mixed lubrication conditions to perform friction and wear experiments to obtain friction coefficients and wear rates.

[0015] According to the wear and leakage analysis method of a mechanical seal with surface microtexture described in one aspect of the present disclosure, the method for calculating the friction coefficient and the load coefficient in step S2 is to solve the Reynolds equation to obtain the lubrication contact pressure of the sealing interface, calculate the friction coefficient of the mechanical seal end face for given operating parameters and surface microtexture parameters, and calculate the load coefficient.

[0016] According to the wear and leakage analysis method of a mechanical seal with surface microtexture described in one aspect of the present disclosure, the calculation formula of the friction coefficient is:

[0017]

[0018] Where τ is the shear force of the entire membrane area; μ dry is the dry friction coefficient; p(i,j) is the contact pressure; λ is the gas-liquid ratio; η is the viscosity of the lubricating oil (which varies with temperature and pressure); r is the radius; ω is the angular velocity; h(i,j) is the actual film thickness, h(i,j)=h0+δ(i,j)+ν(i,j), h0 is the rigid gap, δ(i,j) is the comprehensive roughness, v(i,j) is the elastic deformation; N is the loading force.

[0019] According to one aspect of the present disclosure, a wear and leakage analysis method for a mechanical seal with surface microtexture is provided, wherein the load factor is calculated by the following equation:

[0020]

[0021] Among them, μ n is the maximum friction coefficient; μ0 is the minimum friction coefficient; ξ n , is the load-bearing coefficient corresponding to the maximum friction coefficient; ξ0 is the load-bearing coefficient corresponding to the minimum friction coefficient; ξ is the load-bearing coefficient.

[0022] According to the wear and leakage analysis method of a mechanical seal with surface microtexture described in one aspect of the present disclosure, in step S3, the method for calculating the steady-state value of the dissipation coefficient is to calculate the average value of the dissipation coefficient of multiple measuring points as the steady-state value.

[0023] According to the wear and leakage analysis method of a mechanical seal with surface microtexture described in one aspect of the present disclosure, the calculation formula of the steady-state value of the dissipation coefficient at each measuring point is:

[0024]

[0025] wherein μ is the friction coefficient; V is the linear velocity; and T is the temperature. is the wear rate.

[0026] According to the mechanical seal wear and leakage analysis method with surface micro-texture, the formula for calculating the wear amount is:

[0027]

[0028] wherein t is the wear time.

[0029] According to the mechanical seal wear and leakage analysis method with surface micro-texture, the formula for calculating the wear amount is:

[0030]

[0031] wherein Q is the leakage amount; ρ is the lubricating oil density (changes with temperature and pressure); θ is the circumferential coordinate; r is the radial coordinate; r o is the outer radius of the sealing ring.

[0032] As will be described in detail below, according to the mechanical seal wear and leakage analysis method with surface micro-texture, by S1, the friction and wear experiment is performed to obtain the friction coefficient and the wear rate; S2, the friction coefficient and the load bearing coefficient of the mechanical seal end face under the given working condition parameters and the surface micro-texture parameters are calculated; S3, the steady state value of the dissipation coefficient is calculated; and S4, the wear amount and the leakage amount are calculated. The wear amount and the leakage amount of the mechanical seal with surface micro-texture can be obtained, the wear amount and the leakage amount of the mechanical seal end face under different micro-texture surfaces and different working conditions can be evaluated, and the method has high universality and engineering applicability.

[0033] It is to be understood that both the foregoing general description and the following detailed description are exemplary and intended to provide further explanation of the subject technology. BRIEF DESCRIPTION OF DRAWINGS

[0034] The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which:

[0035] Figure 1 is a structural schematic diagram of the mechanical seal end face with surface micro-texture proposed by the present disclosure;

[0036] Figure 2 is a step flowchart of the method proposed by the present disclosure;

[0037] Figure 3 is a schematic diagram of a Stribeck curve of a mechanical seal pair material proposed by the present disclosure;

[0038] Figure 4 is a specific step flow chart of step S1 of the method proposed by the present disclosure. DETAILED DESCRIPTION

[0039] In order to make the purposes, technical solutions and advantages of the present disclosure more obvious, the example embodiments according to the present disclosure will be described in detail below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all embodiments of the present disclosure, and it should be understood that the present disclosure is not limited to the example embodiments described herein.

[0040] Please refer to Figure 1 The lubrication state of the mechanical seal end face of the aero-engine lubricating oil cavity is very complex, and may experience dry friction, oil-gas mixed lubrication, pure fluid lubrication or coexistence of multiple lubrication states. The friction and wear mode and mechanism of the mechanical seal under the coupling action of multiple fields, multiple phases and multiple flow states are very complex. There are hundreds of wear quantification models, but so far the tribology field has not formed a universally recognized general wear quantification model. The main reason is that the influencing factors of wear are too complex, and the particularity is greater than the universality, which becomes a scientific challenge faced by the wear mechanism, wear quantification and numerical simulation model research of the mechanical seal of the aero-engine lubricating oil cavity under the complex and harsh working conditions in the oil-gas environment.

[0041] Please refer to Figures 2 to 4 The present disclosure proposes a mechanical seal wear and leakage analysis method with surface micro-texture, which comprises the following steps:

[0042] S1, performing a friction and wear experiment to obtain a friction coefficient and a wear rate; in this step, steps S11 to S13 are included.

[0043] S11, performing a tribological test measurement on the mechanical seal pair material by using a friction and wear tester; in specific implementation, after the tribological test measurement, a Stribeck curve is drawn.

[0044] S12, determining a maximum friction coefficient and a minimum friction coefficient; specifically, the maximum friction coefficient and the minimum friction coefficient can be determined according to the Stribeck curve.

[0045] S13, selecting multiple measurement points in the mixed lubrication state to perform a friction and wear experiment to obtain a friction coefficient and a wear rate. In specific implementation, the number of measurement points is not less than 3, and in actual application, the number of measurement points is preferably 4. Through the friction and wear experiment, the friction coefficient and the wear rate are obtained.

[0046] S2, calculate the friction coefficient and load-carrying coefficient of the mechanical seal end face with given working condition parameters and surface micro-texture parameters; specifically, in actual application, the Reynolds equation is solved to obtain the lubrication contact pressure of the sealing interface, and the friction coefficient of the mechanical seal end face with given working condition parameters and surface micro-texture parameters is calculated, and the load-carrying coefficient is calculated.

[0047] The calculation formula of the friction coefficient is:

[0048]

[0049] Where τ is the full film zone shear force; μ dry is the dry friction coefficient; p(i,j) is the contact pressure; λ is the gas-liquid ratio; η is the viscosity of the lubricating oil (changes with temperature and pressure); r is the radius; ω is the angular velocity; h(i,j) is the actual film thickness, h(i,j) = h0+ δ(i,j) + v(i,j), h0 is the rigid gap, δ(i,j) is the comprehensive roughness, and v(i,j) is the elastic deformation; and N is the load.

[0050] The load-carrying coefficient is calculated by the following equation:

[0051]

[0052] Where μ n is the maximum friction coefficient; μ0 is the minimum friction coefficient; ξ n is the load-carrying coefficient corresponding to the maximum friction coefficient; ξ0 is the load-carrying coefficient corresponding to the minimum friction coefficient; and ξ is the load-carrying coefficient.

[0053] S3, calculate the steady-state value of the dissipation coefficient; in specific implementation, in order to ensure accuracy, the method for calculating the steady-state value of the dissipation coefficient is to calculate the average value of the dissipation coefficients of multiple measurement points as the steady-state value. The calculation formula of the steady-state value of the dissipation coefficient of each measurement point is:

[0054]

[0055] Where μ is the friction coefficient; V is the linear velocity; T is the temperature; is the wear rate.

[0056] S4, calculate the wear amount and leakage amount. In this step, the steady-state value is used as an input parameter, and the formula for calculating the wear amount is:

[0057]

[0058] Where t is the wear time.

[0059] The formula for calculating the leakage amount is:

[0060]

[0061] where Q is the leakage rate; p is the lubricant density (varies with temperature and pressure); Q is the circumferential coordinate; r is the radial coordinate; r o is the outer radius of the seal ring.

[0062] The present disclosure provides an effective analysis and evaluation method for the mechanical seal surface texturing design of the aero-engine oil cavity. The method can evaluate the mechanical seal end face wear and leakage under different micro-textured surfaces and different working conditions, and has high universality and engineering applicability.

[0063] The above describes the basic principles of the present disclosure in combination with specific embodiments, but it should be noted that the advantages, advantages, effects and the like mentioned in the present disclosure are only examples and not limitations, and these advantages, advantages, effects and the like cannot be considered as the various embodiments of the present disclosure must have. In addition, the specific details of the above disclosure are only for the purpose of example and for the purpose of understanding, and not for the purpose of limitation, and the above details do not limit the present disclosure to the above specific details.

[0064] The block diagrams of the devices, apparatuses, equipment, systems involved in the present disclosure are only illustrative examples and are not intended to require or imply the connection, arrangement, configuration shown in the block diagram; these devices, apparatuses, equipment, systems can be connected, arranged, configured in any way as those skilled in the art would recognize. Words such as "include", "contain", "have" and the like are open-ended words, which mean "including but not limited to", and can be used interchangeably. The words "or" and "and" used herein mean the word "and / or", and can be used interchangeably unless the context clearly indicates otherwise. The word "such as" used herein means the phrase "such as but not limited to", and can be used interchangeably.

[0065] In addition, as used herein, "or" used in the list of items starting with "at least one of indicates a separate list, so that, for example, "at least one of A, B, or C" means A or B or C, or AB or AC or BC, or ABC (i.e. A and B and C). In addition, the phrase "exemplary" does not mean that the described example is preferred or better than other examples.

[0066] It should also be noted that in the systems and methods of the present disclosure, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be considered as equivalents of the present disclosure.

[0067] Various changes, modifications, and alterations to the techniques described herein can be made without departing from the teachings of the attached claims. Moreover, the scope of the claims of the present disclosure is not limited to the particular aspects described herein. Rather, the scope of the claims of the present disclosure includes all alternatives, modifications, and equivalents falling within the scope of the claims of the present disclosure. Accordingly, the attached claims are incorporated into this Detailed Description by reference.

[0068] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other aspects without departing from the scope of the disclosure. Thus, the present disclosure is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0069] The above description has been presented for the purpose of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present disclosure to the forms disclosed herein. Although various example aspects and embodiments have been discussed above, those of ordinary skill in the art will appreciate a variety of modifications, alternatives, permutations, and equivalents thereof. Accordingly, the disclosure is intended to embrace all such alterations, modifications, and permutations of the aspects described herein, including other aspects falling within the scope of the appended claims.

Claims

1. A method for analyzing wear and leakage of a mechanical seal with surface microtexture, characterized in that: The following steps are involved: S1, conduct friction and wear experiments to obtain the friction coefficient and wear rate of the mechanical seal end face; S2, calculate the friction coefficient and load coefficient of the mechanical seal end face given the working parameters and surface micro-texture parameters; S3, calculate the steady-state value of the dissipation coefficient; S4, calculate the wear and leakage, wherein the steady-state value is used as the input parameter to calculate the wear V w The formula is: Where ξ is the load coefficient to be determined, N is the loading force, μ is the friction coefficient, V is the linear velocity, B is the dissipation coefficient, T is the operating temperature, and t is the wear time.

2. The wear and leakage analysis method of a mechanical seal with surface microtexture according to claim 1, characterized in that: Step S1 includes: S11, using a friction and wear testing machine to conduct tribological test measurements on mechanical seal counterparts; S12, determining the maximum friction coefficient and the minimum friction coefficient; S13, selecting multiple measuring points under mixed lubrication conditions to perform friction and wear experiments to obtain friction coefficients and wear rates.

3. The wear and leakage analysis method of a mechanical seal with surface microtexture according to claim 1, wherein: The method for calculating the friction coefficient and the load coefficient in step S2 is to solve the Reynolds equation, obtain the lubrication contact pressure of the sealing interface, calculate the friction coefficient of the mechanical seal end face given the working condition parameters and surface microtexture parameters, and calculate the load coefficient.

4. The wear and leakage analysis method of a mechanical seal with surface microtexture according to claim 1, wherein: The calculation formula of the friction coefficient is: Where τ is the shear force of the entire membrane area; μ dry is the dry friction coefficient of the mating pair; p(i,j) is the contact pressure; λ is the gas-liquid ratio; η is the viscosity of the lubricating oil; r is the radius; ω is the angular velocity; h(i,j) is the actual film thickness, h(i,j)=h0+δ(i,j)+ν(i,j), h0 is the rigid gap, δ(i,j) is the comprehensive roughness, v(i,j) is the elastic deformation; N is the loading force.

5. The wear and leakage analysis method of a mechanical seal with surface microtexture according to claim 4, characterized in that: The load factor is calculated using the following equation: Among them, μ n is the maximum friction coefficient; μ0 is the minimum friction coefficient; ξ n is the load-bearing coefficient corresponding to the maximum friction coefficient; ξ0 is the load-bearing coefficient corresponding to the minimum friction coefficient; ξ is the load-bearing coefficient to be determined.

6. The wear and leakage analysis method of a mechanical seal with surface microtexture according to claim 1, wherein: In step S3, the method for calculating the steady-state value of the dissipation coefficient is to calculate the average value of the dissipation coefficients of multiple measuring points as the steady-state value.

7. The wear and leakage analysis method of a mechanical seal with surface microtexture according to claim 1, wherein: The calculation formula for the steady-state value of the dissipation coefficient at each measuring point is: Wherein, μ is the friction coefficient; V is the linear velocity; T is the temperature; is the wear rate; ξ is the load factor to be determined; N is the loading force.

8. The wear and leakage analysis method of a mechanical seal with surface microtexture according to claim 1, wherein: The formula for calculating leakage is: Where Q is the leakage; ρ is the density of the lubricating oil; θ is the circumferential coordinate; r is the radial coordinate; r o is the outer radius of the sealing ring; η is the viscosity of the lubricating oil.

Images