Calibration pressure head design method and design system, calibration system and calibration method

Abstract

The invention relates to a calibration pressure head design method and system and a computer readable storage medium. The calibration pressure head design method comprises the following steps: acquiring a mounting structure of a bearing assembly and parameter data of an elastic sealing element, and generating a finite element model according to the parameter data; acquiring operation condition parameters of the elastic sealing element mounted on the mounting structure; inputting the operation condition parameters into the finite element model for elastic deformation analysis to obtain corresponding stress surface parameters of the elastic sealing element; and generating the calibration pressure head according to the stress surface parameters. According to the invention, a good foundation is provided for improving the calibration effect of the thin film pressure sensor.

Description

Technical Field

[0001] The present application relates to the technical field of pressure sensor calibration, and in particular to a calibration pressure head design method and design system, as well as a calibration system and calibration method. Background Art

[0002] Currently, many products have added elastic seals to improve the waterproof and dustproof effects of the products. However, since the elastic seals will age and harden to a certain extent with the use time and changes in the use environment, the sealing effect of the elastic seals will be poor. Based on this, many manufacturers use the method of setting thin film pressure sensors on elastic seals to detect the sealing performance of elastic seals. Before the thin film pressure sensor is put into the sealing structure, it needs to be calibrated first.

[0003] In the related art, the pressure head used to calibrate the thin film pressure sensor mostly adopts a pressure head with an area similar to that of the elastic seal to simulate the actual stress area of ​​the elastic seal. However, in actual use, since the elastic seal has a certain elastic effect, when it is subjected to different degrees of pressure, the elastic seal will undergo different deformations, so that the stress area of ​​the elastic seal will change. For example, when the elastic seal is gradually abutted against the load-bearing component to be matched with it, the contact surface between the elastic seal and the load-bearing component gradually changes from a line to a stress surface, and as the degree of extrusion increases, the stress surface of the elastic seal becomes larger.

[0004] Based on this, not all of the area of ​​the elastic seal is used to bear force. Therefore, the related technology directly uses a pressure head with an area similar to that of the elastic seal to simulate the actual force-bearing area of ​​the elastic seal, which will cause simulation distortion. As a result, when the calibration pressure head presses on the thin film pressure sensor, the force-bearing area of ​​the thin film pressure sensor is too large, and the calibration pressure curve will deviate, which is not conducive to improving the calibration accuracy of the thin film pressure sensor. Summary of the invention

[0005] Based on this, it is necessary to provide a calibration pressure head design method, a design system and a computer-readable storage medium to address the problem of inaccurate calibration of thin film pressure sensors in the related art.

[0006] A calibration pressure head design method, the calibration pressure head is used to calibrate a thin film pressure sensor, and the thin film pressure sensor is used to measure the sealing performance of an elastic seal; at least one of the first body and the second body of the bearing assembly is provided with a mounting groove, and the first body and the second body are surrounded to form a mounting structure, the elastic seal and the thin film pressure sensor are sealed and arranged on the mounting structure, and the thin film pressure sensor and the elastic seal are abutted and matched, and the calibration pressure head design method includes:

[0007] Acquire parameter data of the mounting structure of the bearing assembly, the elastic seal, and the thin film pressure sensor, and generate a finite element model according to the parameter data;

[0008] Acquire operating condition parameters of the elastic seal installed on the mounting structure;

[0009] Inputting the operating condition parameters into the finite element model to perform elastic deformation analysis to obtain the force surface parameters of the thin film pressure sensor pressed against the elastic seal;

[0010] The calibration pressure head is generated according to the force-bearing surface parameters.

[0011] In one embodiment, the parameter data includes three-dimensional structure parameters and material characteristic parameters.

[0012] In one embodiment, the force-bearing surface parameter includes at least one of the force-bearing surface shape and the force-bearing surface area.

[0013] In one embodiment, the operating condition parameter includes at least one of a parameter of an external load applied to the bearing assembly and a parameter of an installation distance between the first body and the second body.

[0014] In one embodiment, the step of inputting the operating condition parameters into the finite element model for elastic deformation analysis to obtain the corresponding force surface parameters of the elastic seal comprises:

[0015] The operating condition parameters include external load parameters;

[0016] The external load parameters are input into the finite element model to perform elastic deformation analysis to obtain the load-bearing surface parameters.

[0017] In one embodiment, the inputting of the operating condition parameters into the finite element model for elastic deformation analysis to obtain the corresponding force surface parameters of the elastic seal includes:

[0018] Inputting the operating condition parameters into the finite element model to perform elastic deformation analysis to obtain compression parameters of the elastic seal corresponding to the operating condition;

[0019] The corresponding stress surface parameters of the elastic seal are obtained according to the compression parameters.

[0020] In one of the embodiments, the operating conditions include installation distance parameters;

[0021] The step of inputting the operating condition parameters into the finite element model to perform elastic deformation analysis to obtain the compression parameters of the elastic seal corresponding to the operating condition includes:

[0022] The installation distance parameter is input into the finite element model, and the compression parameter is calculated according to the installation distance parameter.

[0023] A design system for calibrating a pressure head, comprising:

[0024] A generation module, used to obtain parameter data of the mounting structure of the bearing assembly, the elastic seal and the thin film pressure sensor, and generate a finite element model according to the parameter data;

[0025] A processing module, used for obtaining operating condition parameters of the elastic seal installed on the installation structure;

[0026] An analysis module, used for inputting the operating condition parameters into the finite element model to perform elastic force analysis, so as to obtain the force surface parameters of the thin film pressure sensor pressed against the elastic seal;

[0027] A manufacturing module is used to design the calibration pressure head according to the load-bearing surface parameters.

[0028] A calibration system for a thin film pressure sensor, comprising:

[0029] A calibration pressure head, wherein the calibration pressure head is a calibration pressure head prepared by the calibration pressure head design method in the above embodiment;

[0030] A pressure output member, used for successively pressing the calibration pressure head with a plurality of preset pressure values, so that the pressure sensor to be calibrated is outputted through the calibration pressure head;

[0031] A pressure detection component, electrically connected to the pressure sensor to be calibrated, the pressure detection component is used to obtain a plurality of piezoelectric signals corresponding to the plurality of preset pressure values;

[0032] The data processing module is used to receive the plurality of preset pressure values ​​and the plurality of piezoelectric signals, and the data processing module is used to establish a calibration curve model of the thin film pressure sensor to be calibrated according to the preset pressure values ​​and the piezoelectric signals.

[0033] A calibration method for a thin film pressure sensor, the calibration method for the thin film pressure sensor comprising:

[0034] The pressure output member presses against the calibration pressure head successively with a plurality of preset pressure values, so that the thin film pressure sensor to be calibrated is pressed against the calibration pressure head for a plurality of times; the calibration pressure head is a calibration pressure head prepared by the calibration pressure head design method according to claims 1 to 7 above;

[0035] The pressure detection element obtains a plurality of piezoelectric signals corresponding to the plurality of preset pressure values ​​one by one;

[0036] A calibration curve model of the thin film pressure sensor to be calibrated is established according to the plurality of preset pressure values ​​and the plurality of pressure point signals.

[0037] The above-mentioned calibration pressure head design method and design system as well as the calibration system and calibration method. The design method of the calibration pressure head can obtain the corresponding finite element model through the installation structure and the elastic seal parameter information. Further, by obtaining the operating condition parameters, the installation status of the installation structure and the elastic seal at this time can be obtained, so as to obtain the actual compression amount of the elastic seal corresponding to the operating condition at this time through the installation status. That is, after the operating condition is input into the finite element model, the actual stress force surface distribution and size of the elastic seal can be obtained to obtain the force surface parameters of the elastic seal at this time. The calibration pressure head designed by this method is more in line with the actual use of the elastic seal, so that the stress distribution surface applied to the elastic seal is more concentrated and accurate. Accordingly, when the calibration pressure head made of the actual force area is used for calibration, the calibration accuracy of the thin film pressure sensor can be improved, which is convenient for better and better improvement of the detection accuracy of the thin film pressure sensor for detecting the elastic seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a cross-sectional view of the installation structure of the bearing assembly and the elastic sealing member in one embodiment.

[0039] Figure 2 Schematic diagram of the structure of a calibration system for a thin film pressure sensor shown in an embodiment.

[0040] Figure 3 Schematic diagram of a flow chart of a method for designing a calibration pressure head in one embodiment.

[0041] Figure 4 FIG. 4 is a flow chart of a calibration method for a thin film pressure sensor shown in an embodiment.

[0042] Figure 5 It is a cross-sectional view of the installation structure of the bearing assembly and the elastic sealing member in another embodiment.

[0043] Figure 6 FIG. 1 is a flow chart of step S21 in an embodiment.

[0044] Figure 7 Schematic diagram of the design system structure of the calibration pressure head shown in one embodiment.

[0045] Description of reference numerals:

[0046] 10. Design system of calibration pressure head; 11. Generation module; 12. Processing module; 13. Analysis module; 14. Manufacturing module; 100. Carrying assembly; 100a. Mounting slot; 110. First body; 120. Second body; 200. Elastic sealing element; 20. Calibration system of thin film pressure sensor; 21. Calibration pressure head; 22. Pressure output element; 23. Pressure detection element; 24. Data processing module. DETAILED DESCRIPTION

[0047] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0048] Generally, a film pressure sensor is composed of two thin layers of polymer film, with horizontal and vertical conductors printed on the inner surfaces of the two films. The intersections formed by the intersection of the horizontal and vertical conductors are composed of special sensitive materials, and multiple intersections form a pressure sensitive area. When an external force acts on the sensitive area, the electrical properties of the sensitive material change regularly with the change of the external force. By collecting the changes in the electrical signals of the sensitive material, the external force can be monitored.

[0049] At present, the common calibration technology is the quantitative pressure calibration method, that is, the calibration pressure head is pressed on the thin film pressure sensor, and multiple preset directional pressures are output to the sensitive area by direction, and the resistance or current value corresponding to the thin film pressure sensor at this time is recorded to obtain the calibration pressure curve of the thin film pressure sensor. Among them, the calibration pressure head is used to calibrate the thin film pressure sensor, and the thin film pressure sensor is used to measure the sealing performance of the elastic seal 200.

[0050] like Figure 1 As shown, at least one of the first body 110 and the second body 120 of the carrier assembly 100 is provided with a mounting groove 100a, and the first body 110 and the second body 120 are surrounded to form a mounting structure, and the elastic seal 200 is sealed and arranged on the mounting structure. (The first body 110 and the second body 120 may be arranged in abutment with each other and surrounded to form a completely closed mounting groove 100a cavity, or the first body 110 and the second body 120 may be arranged at intervals and the two may be sealed and connected by the elastic seal 200). The elastic seal and the thin film pressure sensor are sealed and arranged on the mounting structure, and the thin film pressure sensor is in abutment with the elastic seal. Combined Figure 1 As shown, the thin film pressure sensor can be pressed and arranged between the sealing member and the first body 110, or pressed and arranged between the second body 120 and the sealing member.

[0051] like Figure 2 As shown, the present application provides a calibration system 20 for a thin film pressure sensor.

[0052] The calibration system 20 of the thin film pressure sensor includes: a calibration pressure head 21 , a pressure output component 22 , a pressure detection component 23 and a data processing module 12 .

[0053] For ease of understanding, the design method of the calibration pressure head 21 is first described below.

[0054] like Figure 3 As shown, the calibration pressure head design method provided in this application includes:

[0055] S1. Obtain parameter data of the installation structure of the bearing assembly 100, the elastic sealing component 200 and the thin film pressure sensor, and generate a finite element model according to the parameter data.

[0056] The finite element model is a model created when using FEA (Finite Element Analysis). FEA uses mathematical approximation methods to simulate real physical systems such as geometry and load conditions.

[0057] The mounting structure on the bearing assembly 100 (which may be a mounting groove 100a, a convex body, etc.) enables the elastic seal 200 to be sealed and mounted on the mounting structure by means of position limiting engagement, position limiting sleeve, etc. In one embodiment, the parameter data includes three-dimensional structural parameters and material characteristic parameters. The three-dimensional structural parameters refer to the three-dimensional structural data of the mounting structure, the elastic seal 200, and the thin film pressure sensor. The material characteristic parameters may be the material hardness parameters of the bearing assembly 100 itself and the elastic characteristic parameters of the material of the elastic seal 200.

[0058] The parameter data may be obtained through user input or through shape matching to retrieve the bearing component 100 and elastic seal 200 models matching the shape from the database for assembly, and generate a corresponding finite element model for subsequent geometric and elastic force analysis of the elastic seal 200.

[0059] S2. Obtain operating condition parameters of the elastic sealing member 200 installed on the installation structure.

[0060] The operating condition parameter represents the installation condition of the elastic seal 200 assembled to the installation structure, which is related to the area and shape of the force-bearing surface of the elastic seal 200 .

[0061] S3. Inputting the operating condition parameters into the finite element model to perform elastic deformation analysis to obtain the force surface parameters of the thin film pressure sensor pressed against the elastic seal 200.

[0062] The force-bearing surface parameters may include at least one of the force-bearing surface shape and the force-bearing surface area, etc., which may be selected according to actual usage. In one example, the force-bearing surface parameters include the force-bearing surface shape and the force-bearing surface area, so as to improve the degree of simulation of the force-bearing surface of the actual elastic seal 200 by the calibration pressure head, which is conducive to improving the calibration accuracy of the thin film pressure sensor.

[0063] S4. Generate a calibration pressure head according to the load-bearing surface parameters.

[0064] In this way, the present application can obtain the corresponding finite element model through the installation structure and the parameter information of the elastic seal 200. Further, by obtaining the operating condition parameters, the installation conditions of the installation structure and the elastic seal 200 at this time can be obtained, so as to obtain the actual compression amount of the elastic seal 200 corresponding to the operating condition at this time through the installation conditions. That is, after the operating condition is input into the finite element model, the actual stress force surface distribution and size of the elastic seal 200 can be obtained to obtain the force surface parameters of the elastic seal 200 at this time. The calibration pressure head designed by this method is more in line with the actual use of the elastic seal 200, so that the stress distribution surface applied to the elastic seal 200 is more concentrated and accurate. Accordingly, when the calibration pressure head made of the actual force area is used for calibration, the calibration accuracy of the thin film pressure sensor can be improved, which is convenient for better and better subsequent improvement of the detection accuracy of the thin film pressure sensor for detecting the elastic seal 200.

[0065] Specifically, in combination with the calibration pressure head 21 in the above embodiment. Figure 4 As shown, the calibration system 20 of the thin film pressure sensor can be used to implement the calibration method of the thin film pressure sensor.

[0066] Specifically, the calibration method of the thin film pressure sensor may include:

[0067] T1, the pressure output member 22 presses the calibration pressure head 21 with multiple preset pressure values, so that the pressure sensor to be calibrated outputs pressure through the calibration pressure head.

[0068] The calibration pressure head can be obtained through steps S1 to S4 in the above embodiment. In this way, the calibration pressure head 21 can be used to press the thin film pressure sensor to be calibrated multiple times, so that the thin film pressure sensor to be calibrated outputs different pressures in each pressing.

[0069] T2. The pressure detection component obtains a plurality of piezoelectric signals corresponding to a plurality of preset pressure values.

[0070] T3. Establish a calibration curve model of the thin film pressure sensor to be calibrated according to multiple preset pressure values ​​and multiple pressure point signals.

[0071] Among them, step T3 can be calculated by the data processing module 12, and the data of the preset pressure value and the electrical signal can be manually input into the data processing module 12, or can be transmitted through a communication connection (that is, the communication connection between the data processing module 12 and at least one of the pressure output component 22 and the pressure detection component 23 is realized).

[0072] In this way, by using the calibration pressure head 21 in the above embodiment to calibrate the thin film pressure sensor, the stress bearing surface of the thin film pressure sensor can be made more consistent with the actual stress bearing surface of the seal under the actual operating condition parameters. Based on this, multiple pressure calibration tests are performed on this specific stress bearing surface, which is more in line with the detection environment of the thin film pressure sensor when detecting the seal, which is conducive to improving the calibration accuracy of the thin film pressure sensor, thereby improving the subsequent detection accuracy of the sealing performance of the seal using the calibrated thin film pressure sensor.

[0073] For ease of understanding, the design method of the calibration pressure head 21 in an implementation scenario is described below.

[0074] Combination Figure 1 As shown, the first body 110 is provided with a mounting groove 100a, and the second body 120 is pressed and matched with the first body 110 by pressing the elastic seal 200. In the related art, in order to detect the sealing performance of the elastic seal 200, a thin film pressure sensor is provided between the second body 120 and the elastic seal 200, and the thin film pressure sensor can be calibrated by the calibration method of the thin film pressure sensor in the present application. In this process, the calibration pressure head 21 can be designed by the design method of the calibration pressure head 21. The details are as follows.

[0075] Q1: How to establish Figure 1 The finite element analysis model of the mounting structure of the carrier assembly 100 containing the thin film pressure sensor is shown. In this process, the structural features of the mounting structure and the structural features of the seal can be determined, including the gap between the first body 110 and the second body 120, the depth of the mounting groove 100a, the original length of the elastic seal 200, the material characteristics of the elastic seal 200, the three-dimensional characteristics of the thin film pressure sensor, etc., to form a geometric model of these areas when the mounting structure, the elastic seal 200 and the thin film pressure sensor are assembled.

[0076] Q2: According to the operating parameters of the load-bearing assembly 100 (such as the fitting clearance between the first body 110 and the second body 120, or the stress applied to the second body 120), calculate and obtain the force surface parameters of the thin film pressure sensor and the sealing ring in the sealing groove under the operating parameters, including at least one of the shape and contact area of ​​the contact surface, and design and manufacture the corresponding conversion joint.

[0077] Q3: The film pressure sensor to be calibrated is calibrated point by point using different conversion joints through the pressure output component 22 (such as a digital tension and pressure gauge or an electronic pressure gauge, etc.), and the pressure detection component 23 (such as a multimeter or a voltmeter, etc.) obtains the pressure point signal at this time to obtain the characteristic curve of the film pressure sensor under the operating condition.

[0078] In one embodiment, the operating condition parameters include parameters of an external load applied to the bearing assembly 100 and parameters of an installation distance between the first body 1101 and the second body 120 .

[0079] It should be noted that the applied load parameter is the magnitude of the stress applied to the elastic seal 200, and within a certain limit, the greater the stress, the greater the compression of the elastic seal 200, thereby making the stress contact area of ​​the elastic seal 200 larger. The depth parameter of the mounting groove 100a refers to the depth distance of the mounting groove 100a. The mounting distance parameter refers to the relative distance parameter between the first body 110 and the second body 120 when the first body 110 or the second body 120 is pressed against the elastic seal 200.

[0080] In one embodiment, the load-bearing surface parameters may be related to the external load parameters. Step S3 includes:

[0081] S310, inputting the external load parameters into the finite element model to perform elastic deformation analysis to obtain the load-bearing surface parameters.

[0082] For ease of understanding, the calibration pressure head design method is described below with reference to some example scenarios.

[0083] In one example, see Figure 5 As shown, the elastic sealing member 200 is a sealing ring, and the first body 110 is inserted into the sealing ring, so that the first body 110 is inserted into the second body 120 through the sealing ring (similar to the fit between the bottle mouth and the bottle stopper). The stress of the sealing ring is concentrated and distributed to the side wall of the sealing sleeve close to the first body 110 and the side wall of the sealing sleeve close to the second body 120.

[0084] Based on this, the operating conditions may include an applied load parameter operating condition, and the applied load parameter is related to the friction force and friction area of ​​the side wall of the first body 110 and the sealing sleeve, and then the applied load parameter can be input into the finite element model to analyze and obtain the force surface parameters of the side wall of the sealing sleeve that is actually pressed against the first body 110 and the second body 120. That is, in this example, the force surface parameters of the side wall of the elastic seal 200 can be obtained through the applied load parameter.

[0085] In another embodiment, step S3 may include:

[0086] S320, inputting the operating condition parameters into the finite element model for elastic deformation analysis to obtain the compression parameters of the elastic seal 200 corresponding to the operating condition, and obtaining the corresponding force surface parameters of the elastic seal 200 according to the compression parameters.

[0087] That is, in this embodiment, the compression parameter is obtained through the first correspondence between the operating condition parameter and the compression parameter, and the force surface parameter is obtained based on the second correspondence between the compression parameter and the force surface parameter. The information of the operating condition parameter and the force surface parameter is obtained by converting the two correspondences. In this way, it is helpful to reduce the difficulty of calculation and simplify the calculation steps, and improve the production efficiency of the calibration pressure head.

[0088] The operating condition at this time may be at least one of an applied load parameter, a depth parameter of the installation groove 100 a , and an installation distance parameter of the bearing assembly 100 .

[0089] It should be noted that, at this time, the compression parameters can be obtained from the operating condition parameters through the corresponding relationship between the external load parameters and the compression parameters, or through the corresponding relationship between the installation distance parameters and the compression parameters.

[0090] In one embodiment, the operating condition includes an installation distance parameter, wherein the installation distance parameter is related to the distance between the first body 110 and the second body 120 .

[0091] Based on this, in some embodiments, step S320 may include:

[0092] S321. Input installation distance parameters into the finite element model.

[0093] S322. Calculate the compression parameter according to the installation distance parameter.

[0094] For ease of understanding, the installation distance parameters are explained below with reference to some examples.

[0095] In a specific embodiment, the second body 120 is provided with a second surface, and the first surface and the second surface are arranged facing each other. The mounting groove 100a is arranged on the first surface or the second surface. The elastic seal 200 is limitedly arranged in the mounting groove 100a. Assuming that the distance between the first surface and the second surface is the first gap X1, the depth data of the mounting groove 100a is X2, and assuming that the installation distance parameter is P1, the initial height of the elastic seal 200 is Y1. In an example,

[0096] P1 = a1*[Y1-(X1+X2)]+b1…………(1).

[0097] Wherein, a1≠0a1 is the first coefficient for calculating correction, and b1 is the second coefficient for calculating correction.

[0098] In another specific embodiment, the first body 110 is provided with a first groove, the second body 120 is provided with a second groove, the first body 110 is provided with a first surface, the second body 120 is provided with a second surface, and the first surface and the second surface are arranged facing each other. The first groove is recessed on the first surface, and the second groove is recessed on the second surface. Assuming that the spacing between the first surface and the second surface is the second gap X3, the depth data of the first groove is X4, the depth data of the second groove is X5, and assuming that the installation distance parameter is P2, the initial height of the elastic seal 200 is Y2.

[0099] In another example, P2 = a2*[Y2-(X3+X4+X5)]+b2………(2).

[0100] Wherein, a2≠0, a1 is the third coefficient for calculation correction, and b2 is the fourth coefficient for calculation correction.

[0101] That is, the installation distance parameter is related to the depth parameter of the installation structure. Of course, it is understandable that the installation distance parameter can also be defined differently in different usage scenarios based on the above principles. For example, if the installation distance parameter is the gap between the first surface and the second surface, the depth parameter of the installation groove 100a can be calculated by the finite element model to calculate the installation distance parameter. Alternatively, the depth parameter of the entire installation structure can be directly obtained as the installation distance parameter. In this case, there is no need to use the finite element model to obtain the depth parameter of the installation groove 100a, etc. Those skilled in the art can make different deformation methods and calculation formulas for the installation structure parameters based on the above principles. Based on this, no excessive restrictions are made here.

[0102] That is, the installation distance parameter can determine the maximum compression of the elastic seal 200 when it is installed on the mounting structure. When the elastic seal 200 reaches the maximum compression, no matter how much stress is increased due to the increase in the external load parameter, it will not affect the maximum compression of the elastic seal 200, and will not affect the stress contact area of ​​the elastic seal 200 at this time. At this time, the maximum compression determines the stress contact area of ​​the elastic seal 200. In this way, calculating the stress surface parameters through the installation distance parameters is different from calculating the stress surface parameters through the external load parameters. The accuracy of calculating the stress surface parameters can be improved, and the calculation is simpler, which is conducive to improving the efficiency of generating the calibration pressure head.

[0103] In addition, different from the relationship between the external load parameters and the compression parameters in the finite element model after the external load parameters are input, the compression parameters are obtained by installing the distance parameters, that is, they can be obtained through the corresponding relationship between the installation distance parameters and the compression parameters in the finite element model. The calculation is simpler and more convenient, and does not involve too much mechanical analysis and mechanical calculation, which is beneficial to reducing the requirements on the algorithm and computing power of the calibration system and improving the calculation speed.

[0104] Further, in one embodiment, if Figure 6 As shown, step S320 also includes:

[0105] S3211, inputting installation distance parameters into the finite element model. The installation distance parameters may be a gap distance between the first surface and the second surface, or a depth distance of the installation structure.

[0106] S3222: Determine whether the installation distance parameter is less than or equal to a preset value, where the preset value may be 0 mm, 1 mm, etc.

[0107] When the installation distance parameter is less than or equal to the preset value, the finite element model calculates the depth parameter of the installation groove 100a, and uses the depth of the installation groove 100a as the force-bearing surface parameter.

[0108] When the installation distance parameter is greater than a preset value, the finite element model calculates the depth parameter of the installation groove 100 a , and calculates the force surface parameter according to the installation distance parameter and the depth parameter of the installation groove 100 a .

[0109] In this way, generally, since the depth of the installation groove 100s can be known from the three-dimensional features and the data is relatively easy to obtain, the calculation scenarios can be divided first by judging the installation distance parameters, without having to substitute them into the same calculation model such as the above formula (1) or (2) to verify the calculation, which is beneficial to improving the calculation efficiency of specific calculation scenarios.

[0110] The operating condition parameters in the above embodiment may also include external load parameters and installation distance parameters, which can be adapted to other structures of the bearing assembly 100. Specifically, in one example, at least one of the first body 110 and the second body 120 is a soft material (such as silicone, rubber, etc.), so that the groove wall of the installation groove 100a can be deformed. When the external load parameters are received, the installation groove 100a and the seal will be deformed synchronously. At this time, the external load parameters and the installation distance parameters can be input into the finite element model to accurately analyze the stress bearing area of ​​the seal to improve the specified accuracy of the calibration pressure head. The calibration pressure head is made to be more in line with the actual working conditions of the bearing assembly 100, thereby improving the calibration accuracy of the thin film pressure sensor, and can provide good detection conditions for the subsequent thin film pressure sensor to detect the sealing performance of the elastic seal 200.

[0111] Accordingly, in the above embodiment, different calibration pressure heads can be specified according to different operating conditions to obtain multiple calibration curves of the thin film pressure sensor, thereby providing a large amount of data support for the subsequent thin film pressure sensor to detect the sealing performance of the sealing element.

[0112] In one example, the calibration pressure head design method also includes:

[0113] S201, obtaining a first operating condition parameter and a second operating condition parameter of the elastic sealing member 200 installed on the mounting pressure head.

[0114] S301, inputting the first operating condition parameter into the finite element model for elastic force analysis to obtain the first force surface parameter of the corresponding elastic seal 200. Inputting the second operating condition parameter into the finite element model for elastic force analysis to obtain the second force surface parameter of the corresponding elastic seal 200.

[0115] S401. Design at least two different calibration pressure heads according to the first force-bearing surface parameters and the second force-bearing surface parameters.

[0116] The present application provides a calibration pressure head design system to implement the calibration pressure head design method in the above embodiment.

[0117] Specifically, the design system of the calibration pressure head includes a generation module 11 , a processing module 12 , an analysis module 13 and a manufacturing module 14 .

[0118] The generation module 11 is used to obtain parameter data of the mounting structure elastic seal 200 and the thin film pressure sensor of the bearing assembly 100, and generate a finite element model according to the parameter data.

[0119] The processing module 12 is used to obtain the operating condition parameters of the elastic seal 200 installed on the installation structure. In one example, the processing module 12 can be an input module, which is used to receive the operating condition parameters input by the user. In another example, the processing module 12 can be a measurement module, which is used to measure the installation distance of the bearing assembly 100, so as to use the installation distance as the operating condition parameter.

[0120] The analysis module 13 is used to input the operating condition parameters into the finite element model to perform elastic force analysis to obtain the force surface parameters of the film pressure sensor pressed against the elastic seal 200.

[0121] The manufacturing module 14 is used to design and calibrate the pressure head according to the parameters of the force-bearing surface. The manufacturing module 14 can be a metal casting device or a 3D printer.

[0122] The analysis module 13 in the above embodiment may also be connected to the production module 11 and the processing module 12 in communication, and the analysis module 13 may store a program, which, when executed, is used to implement the above-mentioned design method of the calibration pressure head.

[0123] The present application may take the form of a computer program product implemented on one or more computer-readable storage media (including but not limited to disk storage, optical storage, etc.) containing program code. Computer-readable storage media include permanent and non-permanent, removable and non-removable media, and information storage can be implemented by any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer-readable storage media include but are not limited to: phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, read-only compact disk read-only memory, digital versatile disk (DVD) or other optical storage, magnetic cassettes, tape disk storage or other magnetic storage devices or any other non-transmission medium that can be used to store information that can be accessed by a computing device.

[0124] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0125] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0126] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0127] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0128] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0129] In combination with any embodiment of the above-mentioned bearing assembly, the bearing assembly includes a first body and a second body. At least one of the first body and the second body is provided with a mounting groove, and the first body and the second body are surrounded to form a mounting structure, and the elastic sealing member is sealed in the mounting structure of the bearing assembly.

[0130] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0131] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A calibration pressure head design method, wherein the calibration pressure head is used to calibrate a thin film pressure sensor, and the thin film pressure sensor is used to measure the sealing performance of an elastic seal; at least one of the first body and the second body of the bearing assembly is provided with a mounting groove, and the first body and the second body are surrounded to form a mounting structure, the elastic seal and the thin film pressure sensor are sealed and arranged on the mounting structure, and the thin film pressure sensor and the elastic seal are abutted and matched, characterized in that: The calibration pressure head design method comprises: Acquire parameter data of the mounting structure of the bearing assembly, the elastic seal, and the thin film pressure sensor, and generate a finite element model according to the parameter data; Acquire operating condition parameters of the elastic seal installed on the mounting structure; Inputting the operating condition parameters into the finite element model to perform elastic deformation analysis to obtain the force surface parameters of the thin film pressure sensor pressed against the elastic seal; The calibration pressure head is generated according to the force-bearing surface parameters.

2. The calibration pressure head design method according to claim 1, characterized in that: The parameter data includes three-dimensional structure parameters and material characteristic parameters.

3. The calibration pressure head design method according to claim 1, characterized in that: The force-bearing surface parameters include at least one of the force-bearing surface shape and the force-bearing surface area.

4. The calibration pressure head design method according to claim 1, characterized in that: The operating condition parameters include at least one of a parameter of an external load applied to the bearing assembly and a parameter of an installation distance between the first body and the second body.

5. The calibration pressure head design method according to claim 4, characterized in that: The step of inputting the operating condition parameters into the finite element model to perform elastic deformation analysis to obtain the corresponding force surface parameters of the elastic seal comprises: The operating condition parameters include external load parameters; The external load parameters are input into the finite element model to perform elastic deformation analysis to obtain the load-bearing surface parameters.

6. The calibration pressure head design method according to claim 4, characterized in that: The step of inputting the operating condition parameters into the finite element model to perform elastic deformation analysis to obtain corresponding stress surface parameters of the elastic seal comprises: Inputting the operating condition parameters into the finite element model to perform elastic deformation analysis to obtain compression parameters of the elastic seal corresponding to the operating condition; The corresponding stress surface parameters of the elastic seal are obtained according to the compression parameters.

7. The calibration pressure head design method according to claim 6, characterized in that: The operating conditions include installation distance parameters; The step of inputting the operating condition parameters into the finite element model to perform elastic deformation analysis to obtain the compression parameters of the elastic seal corresponding to the operating condition includes: The installation distance parameter is input into the finite element model, and the compression parameter is calculated according to the installation distance parameter.

8. A system for designing a calibration pressure head, characterized in that: include: A generation module, used to obtain parameter data of the mounting structure of the bearing assembly, the elastic seal and the thin film pressure sensor, and generate a finite element model according to the parameter data; A processing module, used for obtaining operating condition parameters of the elastic seal installed on the installation structure; An analysis module, used for inputting the operating condition parameters into the finite element model to perform elastic force analysis, so as to obtain the force surface parameters of the thin film pressure sensor pressed against the elastic seal; A manufacturing module is used to design the calibration pressure head according to the load-bearing surface parameters.

9. A calibration system for a thin film pressure sensor, characterized in that: include: A calibration pressure head, wherein the calibration pressure head is a calibration pressure head prepared by the calibration pressure head design method according to claims 1 to 7; A pressure output member, used for successively pressing the calibration pressure head with a plurality of preset pressure values, so that the pressure sensor to be calibrated is outputted through the calibration pressure head; A pressure detection component, electrically connected to the pressure sensor to be calibrated, the pressure detection component is used to obtain a plurality of piezoelectric signals corresponding to the plurality of preset pressure values; The data processing module is used to receive the plurality of preset pressure values ​​and the plurality of piezoelectric signals, and the data processing module is used to establish a calibration curve model of the thin film pressure sensor to be calibrated according to the preset pressure values ​​and the piezoelectric signals.

10. A calibration method for a thin film pressure sensor, characterized in that: The thin film pressure sensor calibration method comprises: The pressure output member presses against the calibration pressure head successively with a plurality of preset pressure values, so that the thin film pressure sensor to be calibrated is pressed against the calibration pressure head for a plurality of times; the calibration pressure head is a calibration pressure head prepared by the calibration pressure head design method according to claims 1 to 7 above; The pressure detection element obtains a plurality of piezoelectric signals corresponding to the plurality of preset pressure values ​​one by one; A calibration curve model of the thin film pressure sensor to be calibrated is established according to the plurality of preset pressure values ​​and the plurality of pressure point signals.

Images