Method and system for determining the sealing state and critical pressure of a sealing interface

Abstract

This application discloses a method and system for determining the sealing state and critical pressure of a sealing interface, first determining the first actual contact area A. big Second actual contact area A small Then, determine whether |A| is satisfied. big -A small |>ε; If so, determine the sealing state between the two interfaces under the third set pressure; if the sealing state between the two interfaces is leakage, adjust the second set pressure to the third set pressure; if the sealing state between the two interfaces is sealing, adjust the first set pressure to the third set pressure; repeat the above steps until |A big -A small If |≤ε, then the second set pressure in the last cycle calculation is determined as the critical pressure. This allows us to determine the minimum pressure or preload required for the sealing structure to maintain a sealed state, providing clear installation guidance for the user.

Description

Technical Field

[0001] This application belongs to the field of sealing design technology, and in particular relates to a method and system for determining the sealing state and critical pressure of a sealing interface. Background Technology

[0002] A sealing structure is a structure used to prevent the leakage of gases, liquids, or solids. Sealing structures are widely used in industry, agriculture, national defense, and daily life. Examples include equipment flanges and pipe flanges used in the pressure vessel industry.

[0003] Typically, a sealing structure achieves its sealing performance through pressure contact between two sealing interfaces. However, currently, users often find it difficult to control the preload force used during installation to ensure that the sealed structure will not leak after installation. Therefore, users often need to repeatedly test the preload force used during the installation of a sealing structure.

[0004] Therefore, determining the preload required for the sealing structure to be in a sealed state, in order to provide users with clear installation guidance, is a technical problem that urgently needs to be solved. Summary of the Invention

[0005] To address the aforementioned technical problems, this application provides a method and system for determining the sealing state and critical pressure of a sealing interface.

[0006] In a first aspect, this application provides a method for determining the sealing state of a sealing interface, comprising two interfaces for sealing. The method includes: acquiring the surface microstructure of the two interfaces; using the surface microstructure to determine the contact distribution of the two interfaces under a first pressure, wherein the contact distribution includes an actual contact area and a non-contact area between the two interfaces; generating a search matrix to characterize the contact distribution of the two interfaces; based on the search matrix, searching for whether a leakage channel exists between the two interfaces, wherein the leakage channel refers to a through channel formed by the non-contact area; if a leakage channel exists between the two interfaces, then the sealing state between the two interfaces under the first pressure is determined to be leakage; if no leakage channel exists between the two interfaces, then the sealing state between the two interfaces under the first pressure is determined to be sealing.

[0007] In one possible implementation, searching for a leakage channel between the two interfaces based on the search matrix includes: determining a search direction, which includes a first search direction and a second search direction, wherein the first search direction refers to the row direction of the search matrix, and the second search direction refers to the column direction of the search matrix; if the search direction is the first search direction, then searching in the row direction of the search matrix for a through channel formed by first elements in adjacent column vectors, where the first element represents the area corresponding to the non-contact area; if a through channel formed by first elements in adjacent column vectors exists in the row direction of the search matrix, then it is determined that a leakage channel exists between the two interfaces in the first search direction; if no through channel formed by first elements in adjacent column vectors exists in the row direction of the search matrix, then it is determined that no leakage channel exists between the two interfaces in the first search direction.

[0008] In one possible implementation, the method further includes: if the search direction is a second search direction, then searching in the column direction of the search matrix for a through-channel formed by the first element in adjacent row vectors; if a through-channel formed by the first element in adjacent row vectors exists in the column direction of the search matrix, then determining that the two interfaces have a leakage channel in the second search direction; if no through-channel formed by the first element in adjacent row vectors exists in the column direction of the search matrix, then determining that the two interfaces do not have a leakage channel in the second search direction.

[0009] In one implementation, the search matrix includes a first element and a second element, wherein the first element represents a non-contact area and the second element represents an actual contact area.

[0010] In one possible implementation, the contact distribution of the two interfaces under a first pressure is determined using a contact mechanics numerical calculation model and the surface microstructure.

[0011] Secondly, this application provides a method for determining the critical pressure of the sealing state of a sealing interface, comprising two interfaces for sealing, including: determining a first actual contact area and a second actual contact area, wherein the first actual contact area is the actual contact area between the two interfaces under a first set pressure, and the second actual contact area is the actual contact area between the two interfaces under a second set pressure, wherein the first set pressure is greater than the second set pressure, the sealing state between the two interfaces is sealed under the first set pressure, and the sealing state between the two interfaces is leaking under the second set pressure; determining whether the absolute value of the difference between the first actual contact area and the second actual contact area is greater than a preset global variable parameter; if the first actual contact area and the second actual contact area are greater than the critical pressure of the second actual contact area, the method further determines whether the critical pressure of the sealing state of a sealing interface is greater than the critical pressure of the sealing state of a sealing interface. If the absolute value of the area difference is greater than the preset global variable parameter, then the sealing state between the two interfaces is determined using the method for determining the sealing state of the sealing interface described in any of the first aspects, under a third set pressure, wherein the third set pressure is greater than the second set pressure and less than the first set pressure; if the sealing state between the two interfaces is leakage under the third set pressure, then the second set pressure is adjusted to the third set pressure; if the sealing state between the two interfaces is sealed under the third set pressure, then the first set pressure is adjusted to the third set pressure; the above steps are repeated until the absolute value of the difference between the first actual contact area and the second actual contact area is less than or equal to the preset global variable parameter, and the second set pressure in the last loop calculation is determined to be the critical pressure.

[0012] In one possible implementation, determining the first actual contact area and the second actual contact area includes: acquiring the surface microstructure of the two interfaces; using the surface microstructure to determine the contact distribution of the two interfaces under a first set pressure and a second set pressure, respectively, wherein the contact distribution includes an actual contact area and a non-contact area between the two interfaces; determining the total area of ​​the actual contact area between the two interfaces under the first set pressure as the first actual contact area; and determining the total area of ​​the actual contact area between the two interfaces under the second set pressure as the second actual contact area.

[0013] In one possible implementation, the third set pressure is an intermediate value between the first set pressure and the second set pressure.

[0014] Thirdly, this application provides a system for determining the sealing state of a sealing interface, comprising two interfaces for sealing, including:

[0015] The acquisition module is used to acquire the surface microstructure of the two interfaces;

[0016] The first determining module is used to determine the contact distribution of the two interfaces under the first pressure by utilizing the surface micromorphology, wherein the contact distribution includes the actual contact area and non-contact area between the two interfaces;

[0017] A generation module is used to generate a search matrix that characterizes the contact distribution of the two interfaces;

[0018] The search module is used to search for whether there is a leakage channel between the two interfaces based on the search matrix. The leakage channel refers to a through channel formed by the non-contact area.

[0019] The second determining module is used to determine, under the first pressure, that the sealing state between the two interfaces is a leak when there is a leakage channel between the two interfaces;

[0020] The third determining module is used to determine that there is no leakage channel between the two interfaces and that the sealing state between the two interfaces is sealed under the first pressure.

[0021] Fourthly, this application provides a system for determining the critical pressure of the sealing state of a sealing interface, comprising two interfaces for sealing, including:

[0022] The fourth determining module is used to determine the first actual contact area and the second actual contact area, wherein the first actual contact area is the actual contact area between the two interfaces under the first set pressure, and the second actual contact area is the actual contact area between the two interfaces under the second set pressure, wherein the first set pressure is greater than the second set pressure, the sealing state between the two interfaces is sealed under the first set pressure, and the sealing state between the two interfaces is leaking under the second set pressure.

[0023] The judgment module is used to determine whether the absolute value of the difference between the first actual contact area and the second actual contact area is greater than a preset global variable parameter.

[0024] The fifth determining module is used to determine the sealing state between the two interfaces under a third set pressure when the absolute value of the difference between the first actual contact area and the second actual contact area is greater than a preset global variable parameter, using the sealing state determination method of the sealing interface as described in any of the first aspects, wherein the third set pressure is greater than the second set pressure and less than the first set pressure.

[0025] The first adjustment module is used to adjust the second set pressure to the third set pressure when the sealing state between the two interfaces is leaking under the third set pressure.

[0026] The second adjustment module is used to adjust the first set pressure to the third set pressure when the sealing state between the two interfaces is sealed under the third set pressure.

[0027] The sixth determining module is used to determine the second set pressure as the critical pressure in the last loop calculation when the absolute value of the difference between the first actual contact area and the second actual contact area is less than or equal to the preset global variable parameter.

[0028] In summary, the method and system for determining the sealing state and critical pressure of the sealing interface provided in this application first obtains the surface microstructure of the two interfaces. Then, a numerical calculation model is used to calculate the contact behavior of the two contact surfaces to obtain their contact state distribution. This contact state distribution is then transformed into a discretized search matrix to determine whether a leakage channel exists. Finally, a bisection method is used to continuously change the applied pressure to obtain the critical pressure. Thus, the method for determining the critical pressure of the sealing state of the sealing interface provided in this application can, on the one hand, determine the minimum pressure or preload required for the sealing structure to be in a sealed state, providing clear installation guidance for users; on the other hand, it can also provide theoretical guidance for researchers in sealing design and optimization. For example, after designing a sealing structure, researchers can use the method provided in this application to determine the minimum pressure required for this sealing structure to be in a sealed state. If the determined minimum pressure does not meet the application requirements, researchers can continue to improve and optimize the sealing structure until the method provided in this application determines the minimum pressure required for this sealing structure to be in a sealed state that meets the application requirements. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 A flowchart illustrating a method for determining the sealing state of a sealing interface, as provided in Embodiment 1 of this application;

[0031] Figure 2A A schematic diagram of the surface microstructure of the two interfaces provided in an embodiment of this application;

[0032] Figure 2B To be Figure 2A A schematic diagram of the surface micromorphology after the two interfaces are equivalent to a rigid pure plane and a rough surface.

[0033] Figure 3 A schematic diagram of the local stress on the two equivalent interfaces under the first pressure provided in the embodiments of this application;

[0034] Figure 4 A contact distribution diagram of the two interfaces under the first pressure provided in the embodiments of this application;

[0035] Figure 5 To and Figure 4 The search matrix corresponding to the contact distribution map in the middle;

[0036] Figure 6 This application provides a flowchart of a method for searching whether a leakage channel exists between two interfaces;

[0037] Figure 7A A schematic diagram showing that there is no leakage channel in the first search direction, as provided in an embodiment of this application;

[0038] Figure 7B A schematic diagram showing a leakage channel in the first search direction, provided for an embodiment of this application;

[0039] Figure 8 A flowchart illustrating a method for determining the critical pressure of a sealing interface in Embodiment 2 of this application;

[0040] Figure 9 A structural block diagram of a system for determining the sealing state of a sealing interface provided in an embodiment of this application;

[0041] Figure 10 This is a structural block diagram of a system for determining the critical pressure of a sealing interface in an embodiment of this application. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] Example 1

[0044] Figure 1 This is a flowchart illustrating a method for determining the sealing state of a sealing interface, as provided in Embodiment 1 of this application. Figure 1 As shown, the method may include the following steps:

[0045] Step S101: Obtain the surface microstructure of the two interfaces.

[0046] A sealing structure typically achieves its sealing performance by having two interfaces in pressure contact. These two interfaces refer to the two interfaces in the sealing structure used for sealing contact.

[0047] This application does not limit the specific implementation method for obtaining the surface micromorphology of the two interfaces. In one possible implementation method, the surface micromorphology of the two interfaces can be obtained by physical detection means; in another possible implementation method, the roughness of the two interfaces can be obtained first, and then the surface micromorphology corresponding to each interface can be simulated and generated by using the conjugate gradient method based on their respective roughness.

[0048] For example, Figure 2A This is a schematic diagram of the surface microstructure of two interfaces provided in an embodiment of this application. For example... Figure 2A As shown, there are two interfaces, namely interface a and interface b. Interfaces a and b are not absolutely smooth, but exhibit rough characteristics, that is, their surface microstructure consists of a series of uneven micro-protrusions of varying sizes.

[0049] Step S102: Using the surface micro-morphology, determine the contact distribution of the two interfaces under the first pressure. The contact distribution includes the actual contact area and non-contact area between the two interfaces.

[0050] When two sealed interfaces are pressed together, contact does not necessarily occur at every point. Instead, only a portion of the micro-protrusions are compressed and deformed together, forming the actual contact area. Thus, the entire contact interface consists of actual contact areas and non-contact areas.

[0051] This application does not limit the specific implementation method for determining the contact distribution of the two interfaces under the first pressure. For example, the contact distribution of the two interfaces under the first pressure can be calculated using a contact mechanics numerical calculation model. To improve computational efficiency, specifically, a CG-FFT numerical calculation model can be used to calculate the contact distribution of the two interfaces under the first pressure. The CG-FFT numerical calculation model is also called the conjugate gradient fast Fourier transform numerical calculation model.

[0052] It should be noted that if the CG-FFT numerical calculation model is used to calculate the contact distribution of the two interfaces under the first pressure, the surface micromorphology of the two rough interfaces needs to be equivalent to a plane and an equivalent rough interface in contact.

[0053] In practical engineering, many sealing structures have two interfaces with significantly different hardness, meaning their Young's modulus (also known as elastic modulus) differs greatly. Examples include metal interfaces with elastic gaskets, metal interfaces with adhesives, and harder metals with softer metals. In such cases, the contact between the two interfaces can be approximated as the contact between two linearly elastic rough surfaces. The pressure is borne in the direction perpendicular to the surface, and the shear stress between the surface micro-protrusions is ignored, meaning the adhesion between the micro-protrusions is considered nonexistent. Therefore, the contact problem between two linearly elastic rough surfaces can be equivalent to the contact between a linearly elastic pure plane and an equivalent rigid rough surface, or the contact between a rigid pure plane and an equivalent linearly elastic rough surface.

[0054] For example, Figure 2A The contact between two rough interfaces in the image can be equivalent to... Figure 2B The contact between a rigid, pure plane and an equivalent linearly elastic rough surface. Thus, as... Figure 3 As shown, when the two interfaces are subjected to the first pressure, the micro-protrusions that make up the surface micro-morphology will undergo elastic deformation under the compression of the plane.

[0055] It should be noted that the contact distribution of the two interfaces determined in this embodiment can be in the form of a contact distribution diagram. For example, Figure 4 The contact distribution diagram of the two interfaces under the first pressure provided in the embodiments of this application. Figure 4 The black area represents the actual contact area, and the gray area represents the non-contact area. For example... Figure 4 As shown, the actual contact area and non-contact area are discretely and irregularly distributed.

[0056] Step S103: Generate a search matrix to characterize the contact distribution of the two interfaces.

[0057] The search matrix consists of a first element and a second element, where the first element represents the non-contact area and the second element represents the actual contact area. The first element can be represented by the number 0, and the second element can be represented by the number 1.

[0058] Combination Figure 4 and Figure 5 As shown, a Cartesian coordinate system is introduced into the contact distribution diagram, where the xy plane coincides with the search matrix. Figure 4 The contact distribution in the matrix is ​​transformed into a discretized search matrix. Figure 5 In this context, the search matrix is ​​matrix S, where the elements of matrix S are defined as Si. i,j Each column vector is defined as Si, and each row vector is defined as S. jThe distribution of the first and second elements in matrix S corresponds to the actual contact and non-contact areas in the contact distribution diagram.

[0059] It should be noted that the above example, using 0 to represent the first element and 1 to represent the second element, is merely illustrative and does not imply any limitation on the representation of the first and second elements. For example, the first element can be represented by 1 and the second element by 0.

[0060] Step S104: Based on the search matrix, search for whether there is a leakage channel between the two interfaces. The leakage channel refers to the through channel formed by the non-contact area.

[0061] Step S105: If there is a leakage channel between the two interfaces, then it is determined that the sealing state between the two interfaces under the first pressure is leakage.

[0062] Step S106: If there is no leakage channel between the two interfaces, then it is determined that the sealing state between the two interfaces is sealed under the first pressure.

[0063] The contact interface of a sealing structure is typically rough, composed of uneven micro-protrusions. When pressure is applied to the contact interface, the actual contact area only occupies a portion of the entire interface, with the remaining portion being a non-contact area. If there are many non-contact areas on the contact interface, and adjacent non-contact areas can connect to form a channel running through the entire contact interface, then liquid on one side of the contact interface will flow out of the sealing structure through this channel. In this case, the channel is called a leakage channel, and the sealing performance of the sealing structure is compromised, which is called a leakage state. Conversely, if there is no leakage channel in the contact interface of the sealing structure, its sealing performance is not compromised, which is called a sealed state.

[0064] This application utilizes a search matrix characterizing the contact distribution between two interfaces to search for whether a leakage path exists between the two interfaces. This application does not limit the specific search method; in one possible implementation, the following search method can be used to determine whether a leakage path exists between the two interfaces.

[0065] Figure 6 A flowchart illustrating a method for searching for a leakage channel between two interfaces, as provided in this application embodiment, is shown below. Figure 6 As shown, the following steps may be included:

[0066] Step S1041: Determine the search direction, which includes a first search direction and a second search direction, wherein the first search direction refers to the row direction of the search matrix and the second search direction refers to the column direction of the search matrix.

[0067] by Figure 5 Taking the search matrix shown as an example, the first search direction is from left to right along the x-axis, and the second search direction is from top to bottom along the y-axis. Generally, the search direction is consistent with the direction in which leakage can occur between the two interfaces.

[0068] Step S1042: If the search direction is the first search direction, then in the row direction of the search matrix, search for whether there is a through channel formed by the first element in the adjacent column vectors, where the first element is used to represent the point corresponding to the non-contact area.

[0069] Step S1043: If there is a through channel formed by the first element in the adjacent column vectors in the row direction of the search matrix, then it is determined that there is a leakage channel in the first search direction between the two interfaces.

[0070] Step S1044: If there is no through channel formed by the first element in adjacent column vectors in the row direction of the search matrix, then it is determined that there is no leakage channel in the first search direction for the two interfaces.

[0071] Step S1045: If the search direction is the second search direction, then in the column direction of the search matrix, search for whether there exists a through channel formed by the first element in the adjacent row vectors.

[0072] Step S1046: If there is a through channel formed by the first element in the adjacent row vector in the column direction of the search matrix, then it is determined that there is a leakage channel in the second search direction between the two interfaces.

[0073] Step S1047: If there is no through channel formed by the first element in adjacent row vectors in the column direction of the search matrix, then it is determined that there is no leakage channel in the second search direction for the two interfaces.

[0074] Taking the search direction as the first search direction as an example, in specific implementation, if the search direction is the first search direction, you can start from the first column vector S1 and traverse to obtain all elements S that are equal to 0. i,1 =0, if in If the empty set is indicated, the search stops; if The search continues. Determine S. i,1 Check if the adjacent element of =0 is 0 and lies in S2. If not, the search stops; if so, consider the surface regions represented by column vectors S1 and S2 to be interconnected, and record all elements in S2 that are adjacent to S1. i,1 The element S is a pair of elements that are adjacent to 0 and are equal to 0. i,2 =0, search continues. Following the search method described above, check each adjacent column vector for connectivity, until column vector S is reached.N-1 With column vector S N The elements are also interconnected, indicating that there exists a region consisting of zero elements that runs through the entire search matrix, meaning that there is a leakage channel in the microstructure of the surface after compression deformation; if the search is performed on the last column vector S... N The fact that it stopped earlier indicates that there was no leakage channel.

[0075] Figure 7A This is a schematic diagram showing that there is no leakage channel in the first search direction, as provided in an embodiment of this application. Figure 7B This is a schematic diagram showing a leakage path in the first search direction, provided as an embodiment of this application. For example... Figure 7A As shown, there exists a channel consisting of 0 elements along the x-axis of the search matrix; however, this channel does not extend across the entire x-axis. Therefore, Figure 7A The search matrix shown has no leakage channels in the first search direction. For example... Figure 7B As shown, in the x-axis direction of the search matrix, there exists a channel consisting of 0 elements that runs through the entire x-axis direction. Therefore, Figure 7B The search matrix shown has a leakage path in the first search direction.

[0076] It should be understood that if the search direction is the second search direction, the above search method can be used as a reference. Specifically, check whether adjacent row vectors are connected. If it is determined that the last two row vectors are also connected, it means that there is a channel consisting of 0 elements that runs through the entire y-axis direction in the search matrix, that is, there is a leakage channel in the micro-morphology of the surface after compression deformation. If the search stops before the last row vector, it means that there is no leakage channel.

[0077] In summary, the method for determining the sealing state of the sealing interface provided in this application embodiment can determine the sealing state between two interfaces used for sealing under any pressure.

[0078] Example 2

[0079] Embodiment 2 of this application provides a method for determining the critical pressure of the sealing state of a sealing interface. This method can determine the minimum pressure required to bring two interfaces into a sealing state.

[0080] Figure 8 A flowchart illustrating a method for determining the critical pressure of a sealing interface in an embodiment of this application. Figure 8 As shown, the following steps may be included:

[0081] Step S201: Determine the first actual contact area and the second actual contact area, wherein the first actual contact area is the actual contact area between the two interfaces under the first set pressure, and the second actual contact area is the actual contact area between the two interfaces under the second set pressure, wherein the first set pressure is greater than the second set pressure.

[0082] In this embodiment of the application, two initial pressures are first set, namely, a first set pressure F. big Second set pressure F small Among them, the first set pressure F big Greater than the second set pressure F small Then, determine the first set pressure F. big Second set pressure F small Below, the actual contact area between the two contact interfaces.

[0083] Among them, the first actual contact area A is determined. big Second actual contact area A small The method can be found in the description of steps S101 and S102 in the above embodiments. For example: first, the surface microstructures of the two interfaces are generated; then, the first set pressure F is determined using the surface microstructures. big Second set pressure F small Below, the contact distribution of the two interfaces, including the actual contact area and non-contact area between the two interfaces; finally, determine F under the first set pressure. big The total area of ​​the contact region between the two interfaces is the first actual contact area A. big Determine the second set pressure F small Below, the total area of ​​the actual contact area between the two interfaces is the second actual contact area A. small .

[0084] It should be noted that the first set pressure F big It must be large enough to ensure that the microstructure of the two interfaces after deformation under pressure remains sealed, and the second set pressure F small It must be small enough that the microstructure of the two interfaces after being deformed by pressure is in a leaky state.

[0085] Step S202, determine the first actual contact area A big With the second actual contact area A small Is the absolute value of the difference greater than the preset global variable parameter ε?

[0086] The embodiments of this application use |A big -A smallε is used as the convergence condition. The default global variable parameter ε can be set to 1%.

[0087] Step S203, if |A big -A small If |>ε, then using the method for determining the sealing state of the sealing interface described in Embodiment 1 above, the sealing state between the two interfaces is determined under the third set pressure, wherein the third set pressure is greater than the second set pressure F. small And less than the first set pressure F big .

[0088] If |A big -A small If |>ε, it means that the current first set pressure F big Second set pressure F small The range of values ​​for the given value is too large to meet the convergence condition. Therefore, this application further sets a third set pressure, wherein the third set pressure is greater than the second set pressure and less than the first set pressure.

[0089] Then, the sealing state of the two interfaces under the third set pressure is determined. The determination of the sealing state of the two interfaces under the third set pressure can be found in the description of Embodiment 1 above, and will not be repeated here.

[0090] Step S204: If the sealing state between the two interfaces is leaking under the third set pressure, then the second set pressure is adjusted to the third set pressure.

[0091] Step S205: If the sealing state between the two interfaces is sealed under the third set pressure, then the first set pressure is adjusted to the third set pressure.

[0092] In this embodiment, based on the determination result of the sealing state between the two interfaces in step S203, the initially set first or second set pressure is adjusted to reassign the first or second set pressure. Specifically, if the determination result of the sealing state between the two interfaces in step S203 indicates leakage, it means that the critical pressure of the sealing state of the sealing interface is between the third set pressure and the first set pressure F. big In between, the third set pressure replaces the initial second set pressure F. small and maintain the first set pressure F big Repeat steps S201 to S202 above, that is, after reassigning the value, the second set pressure F is... small Change to the third set pressure, the first set pressure F bigThe condition remains unchanged. If the sealing state determination result between the two interfaces in step S203 is a seal, it means that the critical pressure of the sealing state of the sealing interface is between the third set pressure and the second set pressure F. small In between, the third set pressure is used instead of the initial set pressure F. big and maintain the second set pressure F small Repeat steps S201 to S202 above, that is, after reassigning the value, set the pressure F. big Change to the third set pressure, the second set pressure F small It remains unchanged.

[0093] Step S206: Repeat steps S201 to S205 until |A big -A small |≤ε, determine the second set pressure F in the last cycle calculation. small This is the critical pressure.

[0094] During each execution of steps S201 to S205 above, if the absolute value of the difference between the first actual contact area and the second actual contact area is greater than the preset global variable parameter, a third set pressure must be selected. This third set pressure is any pressure between the first set pressure and the second set pressure at the time of execution. Then, the sealing state between the two interfaces is determined using the newly determined third set pressure, and based on the result of the sealing state determination, the first set pressure and the second set pressure used to execute step S201 above are re-determined. This process is repeated until the absolute value of the difference between the first actual contact area and the second actual contact area is less than or equal to the preset global variable parameter.

[0095] In one specific implementation, a bisection method can be used to accelerate the convergence process. Specifically, the initial pressures are set to F... big and F small Regarding the generated surface microstructure, under pressure F big F small Next, the contact behavior is calculated to obtain the corresponding actual contact area A. big and A small Determine if the convergence condition is met: |A big -A small If the convergence condition is not met (|>ε), the critical pressure is output; if the convergence condition is met, the loop continues to obtain the intermediate pressure value (F). big +F small The contact behavior of the generated surface microstructure under intermediate pressure is calculated to obtain its contact state. Furthermore, the sealing-leakage state is determined by searching for leakage channels. If it is in a sealing state, then F... big Fsmall Reassign the value and repeat the above loop. Specifically, for F... big and F small Reassign the value as follows:

[0096] F big =(F big +F small ) / 2

[0097] F small =F small

[0098] If it is in a leaking state, then for F big F small Reassign the value and repeat the above loop. Specifically, for F... big and F small Reassign the value as follows:

[0099] F small =(F big +F small ) / 2

[0100] F big =F big

[0101] For example, if after performing the above steps five times, when performing the sixth time, if in step S202 it is determined that the absolute value of the difference between the first actual contact area and the second actual contact area is less than or equal to the preset global variable parameter, then the second set pressure in the sixth calculation is determined to be the critical pressure.

[0102] It should be noted that the method provided in this application embodiment can be used to determine the critical pressure and also to determine the contact area permeation threshold. The contact area permeation threshold refers to the ratio of the actual contact area corresponding to the critical point at which the sealing interface changes from a sealed state to a leaking state or from a leaking state to a sealed state; it can also be called the critical contact area. The contact area permeation threshold is A / A0, where A represents the total contact area of ​​the two interfaces, and A0 represents the actual contact area of ​​the two interfaces. Correspondingly, in the above method, if the convergence condition |A0| is not met... big -A small If |>ε, then the output contact area percolation threshold ≈ A big ≈A small .

[0103] It should also be noted that, in the embodiments of this application, the critical pressure refers to the minimum pressure required to seal the two interfaces. The critical pressure can be a preload force used to bring the two interfaces into contact and cause deformation.

[0104] In summary, the method for determining the critical pressure of the sealing state of the sealing interface provided in this application embodiment, combined with the method for determining the sealing state of the sealing interface provided in Embodiment 1 above, firstly generates the surface microstructure of the two interfaces, then uses a numerical calculation model to calculate the contact behavior of the two contact surfaces to obtain their contact state distribution, transforms the contact state distribution into a discretized search matrix, and determines whether there is a leakage channel; finally, using a bisection method, the magnitude of the applied pressure is continuously changed to obtain the critical pressure or the contact area permeation threshold. Thus, using the method for determining the critical pressure of the sealing state of the sealing interface provided in this application embodiment, on the one hand, the minimum pressure or preload required for the sealing structure to be in a sealing state can be determined, providing clear installation guidance for users; on the other hand, it can also provide theoretical guidance for researchers in sealing design and optimization. For example, after researchers design a sealing structure, they can use the method provided in this application embodiment to determine the minimum pressure required for this sealing structure to be in a sealing state. If the determined minimum pressure cannot meet the application requirements, researchers can continue to improve and optimize the sealing structure until the method provided in this application embodiment determines the minimum pressure required for this sealing structure to be in a sealing state that meets the application requirements.

[0105] Figure 9 This is a structural block diagram of a system for determining the sealing state of a sealing interface, provided in an embodiment of this application. Figure 9 As shown, the system includes:

[0106] The acquisition module 110 is used to acquire the surface microstructure of the two interfaces;

[0107] The first determining module 120 is used to determine the contact distribution of the two interfaces under the first pressure by utilizing the surface micromorphology, wherein the contact distribution includes the actual contact area and non-contact area between the two interfaces.

[0108] The generation module 130 is used to generate a search matrix that characterizes the contact distribution of the two interfaces;

[0109] Search module 140 is used to search for whether there is a leakage channel between the two interfaces based on the search matrix. The leakage channel refers to a through channel formed by the non-contact area.

[0110] The second determining module 150 is used to determine, under the first pressure, that the sealing state between the two interfaces is a leak when there is a leakage channel between the two interfaces;

[0111] The third determining module 160 is used to determine that there is no leakage channel between the two interfaces and that the sealing state between the two interfaces is sealed under the first pressure.

[0112] In one possible implementation, the search module 140 is specifically used to determine a search direction, which includes a first search direction and a second search direction. The first search direction refers to the row direction of the search matrix, and the second search direction refers to the column direction of the search matrix. If the search direction is the first search direction, then in the row direction of the search matrix, a search is performed to determine whether a through-channel formed by first elements in adjacent column vectors exists. The first element represents the area corresponding to the non-contact area. If a through-channel formed by first elements in adjacent column vectors exists in the row direction of the search matrix, then it is determined that the two interfaces have a leakage channel in the first search direction. If no through-channel formed by first elements in adjacent column vectors exists in the row direction of the search matrix, then it is determined that the two interfaces do not have a leakage channel in the first search direction.

[0113] In one possible implementation, the search module 140 is specifically configured to, if the search direction is a second search direction, search in the column direction of the search matrix for a through-channel formed by the first element of adjacent row vectors; if a through-channel formed by the first element of adjacent row vectors exists in the column direction of the search matrix, then determine that the two interfaces have a leakage channel in the second search direction; if no through-channel formed by the first element of adjacent row vectors exists in the column direction of the search matrix, then determine that the two interfaces do not have a leakage channel in the second search direction.

[0114] In one possible implementation, the first determining module 120 is specifically used to determine the contact distribution of the two interfaces under a first pressure by utilizing a contact mechanics numerical calculation model and the surface micromorphology.

[0115] Figure 10 This is a structural block diagram of a system for determining the critical pressure of a sealing interface in an embodiment of this application. Figure 10 As shown, the system includes:

[0116] The fourth determining module 210 is used to determine the first actual contact area and the second actual contact area, wherein the first actual contact area is the actual contact area between the two interfaces under the first set pressure, and the second actual contact area is the actual contact area between the two interfaces under the second set pressure, wherein the first set pressure is greater than the second set pressure, the sealing state between the two interfaces is sealed under the first set pressure, and the sealing state between the two interfaces is leaking under the second set pressure.

[0117] The judgment module 220 is used to determine whether the absolute value of the difference between the first actual contact area and the second actual contact area is greater than the preset global variable parameter.

[0118] The fifth determining module 230 is used to determine the sealing state between the two interfaces under a third set pressure when the absolute value of the difference between the first actual contact area and the second actual contact area is greater than a preset global variable parameter, using the sealing state determination method of the sealing interface provided in the above embodiment. The third set pressure is greater than the second set pressure and less than the first set pressure.

[0119] The first adjustment module 240 is used to adjust the second set pressure to the third set pressure when the sealing state between the two interfaces is leaking under the third set pressure.

[0120] The second adjustment module 250 is used to adjust the first set pressure to the third set pressure when the sealing state between the two interfaces is sealed under the third set pressure.

[0121] The sixth determining module 260 is used to determine the second set pressure in the last loop calculation as the critical pressure when the absolute value of the difference between the first actual contact area and the second actual contact area is less than or equal to the preset global variable parameter.

[0122] In one possible implementation, the fourth determining module 210 is specifically used to acquire the surface microstructure of the two interfaces; using the surface microstructure, to determine the contact distribution of the two interfaces under a first set pressure and a second set pressure, respectively, wherein the contact distribution includes the actual contact area and the non-contact area between the two interfaces; to determine the total area of ​​the actual contact area between the two interfaces under the first set pressure as the first actual contact area; and to determine the total area of ​​the actual contact area between the two interfaces under the second set pressure as the second actual contact area.

[0123] The same or similar parts between the various embodiments in this specification can be referred to mutually. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple, and the relevant parts can be referred to the description in the method embodiments.

[0124] The present application has been described in detail above with reference to specific embodiments and exemplary examples; however, these descriptions should not be construed as limiting the present application. Those skilled in the art will understand that various equivalent substitutions, modifications, or improvements can be made to the technical solutions and implementation methods of the present application without departing from the spirit and scope of the present application, and all such modifications and improvements fall within the scope of the present application. The scope of protection of the present application is determined by the appended claims.

[0125] In a specific implementation, embodiments of this application also provide a computer-readable storage medium, wherein the computer-readable storage medium may store a program, which, when executed, may include some or all of the steps in various embodiments of the method for determining the sealing state of a sealing interface and / or the method for determining the critical pressure of the sealing state of a sealing interface provided in this application. The storage medium may be a magnetic disk, optical disk, read-only memory (ROM), or random access memory (RAM), etc.

[0126] Those skilled in the art will clearly understand that the techniques in the embodiments of this application can be implemented using software plus necessary general-purpose hardware platforms. Based on this understanding, the technical solutions in the embodiments of this application, or the parts that contribute to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application or some parts of the embodiments.

[0127] The embodiments described above do not constitute a limitation on the scope of protection of this application.

Claims

1. A method for determining the critical pressure of a sealing interface in a sealing state, comprising two interfaces for sealing, characterized in that, include: Determine the first actual contact area and the second actual contact area, wherein the first actual contact area is the actual contact area between the two interfaces under the first set pressure, and the second actual contact area is the actual contact area between the two interfaces under the second set pressure, wherein the first set pressure is greater than the second set pressure, the sealing state between the two interfaces is sealed under the first set pressure, and the sealing state between the two interfaces is leaking under the second set pressure. Determine whether the absolute value of the difference between the first actual contact area and the second actual contact area is greater than a preset global variable parameter; If the absolute value of the difference between the first actual contact area and the second actual contact area is greater than a preset global variable parameter, the sealing state between the two interfaces under a third set pressure is determined. The method for determining the sealing state includes: Obtain the surface microstructure of the two interfaces; Using the surface microstructure, the contact distribution of the two interfaces under a third set pressure is determined, and the contact distribution includes the actual contact area and non-contact area between the two interfaces. Generate a search matrix to characterize the contact distribution of the two interfaces; Based on the search matrix, search for whether there is a leakage channel between the two interfaces, where the leakage channel refers to a through channel formed by the non-contact area; If there is a leakage channel between the two interfaces, then under the third set pressure, the sealing state between the two interfaces is determined to be leakage. If there is no leakage channel between the two interfaces, then the sealing state between the two interfaces is determined to be sealed under the third set pressure. Wherein, the third set pressure is greater than the second set pressure and less than the first set pressure; If the seal between the two interfaces is leaking under the third set pressure, then the second set pressure is adjusted to the third set pressure. If the sealing state between the two interfaces is sealed under the third set pressure, then the first set pressure is adjusted to the third set pressure. Repeat the above steps until the absolute value of the difference between the first actual contact area and the second actual contact area is less than or equal to the preset global variable parameter, and determine the second set pressure as the critical pressure in the last loop calculation.

2. The method according to claim 1, characterized in that, The step of searching for a leakage channel between the two interfaces based on the search matrix includes: The search direction is determined, which includes a first search direction and a second search direction, wherein the first search direction refers to the row direction of the search matrix and the second search direction refers to the column direction of the search matrix; If the search direction is the first search direction, then in the row direction of the search matrix, it is searched for whether there is a through channel formed by the first element in the adjacent column vectors, where the first element is used to represent the area corresponding to the non-contact area. If there is a through channel formed by the first element in adjacent column vectors in the row direction of the search matrix, then it is determined that there is a leakage channel in the first search direction for the two interfaces. If there is no through-channel formed by the first element in adjacent column vectors in the row direction of the search matrix, then it is determined that there is no leakage channel in the first search direction for the two interfaces.

3. The method according to claim 2, characterized in that, Also includes: If the search direction is the second search direction, then in the column direction of the search matrix, search for whether there exists a through channel formed by the first element in adjacent row vectors; If there is a through channel formed by the first element in adjacent row vectors in the column direction of the search matrix, then it is determined that there is a leakage channel in the second search direction between the two interfaces. If there is no through-channel formed by the first element in adjacent row vectors in the column direction of the search matrix, then it is determined that there is no leakage channel in the second search direction for the two interfaces.

4. The method according to claim 1, characterized in that, The search matrix includes a first element and a second element, whereby the first element represents the non-contact area and the second element represents the actual contact area.

5. The method according to claim 1, characterized in that, Using a contact mechanics numerical calculation model and the surface micromorphology, the contact distribution of the two interfaces under a third set pressure is determined.

6. The method according to claim 1, characterized in that, Determining the first actual contact area and the second actual contact area includes: Obtain the surface microstructure of the two interfaces; Using the surface microstructure, the contact distribution of the two interfaces under the first set pressure and the second set pressure are determined respectively. The contact distribution includes the actual contact area and the non-contact area between the two interfaces. Under the first set pressure, the total area of ​​the actual contact area between the two interfaces is determined to be the first actual contact area; Under the second set pressure, the total area of ​​the actual contact area between the two interfaces is determined to be the second actual contact area.

7. The method according to claim 1, characterized in that, The third set pressure is the midpoint between the first set pressure and the second set pressure.

8. A system for determining the critical pressure of a sealing interface in a sealing state, comprising two interfaces for sealing, characterized in that, include: The fourth determining module is used to determine the first actual contact area and the second actual contact area, wherein the first actual contact area is the actual contact area between the two interfaces under the first set pressure, and the second actual contact area is the actual contact area between the two interfaces under the second set pressure, wherein the first set pressure is greater than the second set pressure, the sealing state between the two interfaces is sealed under the first set pressure, and the sealing state between the two interfaces is leaking under the second set pressure. The judgment module is used to determine whether the absolute value of the difference between the first actual contact area and the second actual contact area is greater than a preset global variable parameter. The fifth determining module is used to determine the sealing state between the two interfaces under a third set pressure when the absolute value of the difference between the first actual contact area and the second actual contact area is greater than a preset global variable parameter. The sealing state determining system includes an acquisition module, a first determining module, a generation module, a search module, a second determining module, and a third determining module. The acquisition module is used to acquire the surface microstructure of the two interfaces; The first determining module is used to determine the contact distribution of the two interfaces under a third set pressure by utilizing the surface micromorphology, wherein the contact distribution includes the actual contact area and non-contact area between the two interfaces; A generation module is used to generate a search matrix that characterizes the contact distribution of the two interfaces; The search module is used to search for whether there is a leakage channel between the two interfaces based on the search matrix. The leakage channel refers to a through channel formed by the non-contact area. The second determining module is used to determine, under the third set pressure, that the sealing state between the two interfaces is a leak when there is a leakage channel between the two interfaces; The third determining module is used to determine that there is no leakage channel between the two interfaces and that the sealing state between the two interfaces is sealed under the third set pressure. Wherein, the third set pressure is greater than the second set pressure and less than the first set pressure; The first adjustment module is used to adjust the second set pressure to the third set pressure when the sealing state between the two interfaces is leaking under the third set pressure. The second adjustment module is used to adjust the first set pressure to the third set pressure when the sealing state between the two interfaces is sealed under the third set pressure. The sixth determining module is used to determine the second set pressure as the critical pressure in the last loop calculation when the absolute value of the difference between the first actual contact area and the second actual contact area is less than or equal to the preset global variable parameter.

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