Safety detection method, device and equipment for water heater inner container and medium

Abstract

The invention discloses a safety detection method, device and equipment for a water heater inner container and a medium, and belongs to the technical field of water heaters. The method comprises the steps that material attribute parameters and a three-dimensional structure diagram of a simulation model of the inner container of the water heater are obtained, wherein the material attribute parameters comprise the thickness, the elastic modulus, the Poisson's ratio, the density, the yield strength, the tensile strength and a fatigue curve; importing the material attribute parameters and the three-dimensional structure diagram into a pre-built structural strength analysis model, and carrying out a simulation pressing test to obtain the structural stress and fatigue life of the liner simulation model; if the ratio of the yield strength to the structural stress is within a preset ratio range and the fatigue life is greater than a preset life threshold value, performing a real pressing test on a real liner sample corresponding to the liner simulation model; if the result of the real pressing test is passed, the result of the safety detection of the inner container is passed. The method can shorten the research and development period and reduce the detection cost.

Description

Technical Field

[0001] The present invention relates to the technical field of water heaters, and in particular to a method, device, equipment and medium for detecting the safety of a water heater inner tank. Background Art

[0002] With the advancement of technology and the improvement of people's living standards, water heaters have become one of the indispensable household appliances. As a pressure-bearing component, the inner tank of the water heater is the key to the safe service of the water heater.

[0003] At present, before the inner tank of the water heater is mass-produced, the inner tank will be tested for safety. Specifically, several samples will be produced first and subjected to pressure tests to see if there are any problems such as porcelain explosion, cracks, obvious deformation, leakage, etc. on the surface of the sample. If these problems do not occur, it means that the test has passed and the sample meets the requirements and can be mass-produced.

[0004] However, if problems occur with the sample after the test, indicating that the test fails, the designers need to change the design parameters of the inner tank and then produce new samples with the new design parameters and conduct pressure tests on the new samples. If the test still fails, the samples will be modified repeatedly, and the samples and tests will be repeatedly produced. The entire process is relatively long, which leads to a longer R&D cycle and also causes higher costs for safety testing of the water heater inner tank. Summary of the invention

[0005] In view of the above problems, the present invention is proposed to provide a safety detection method, device, equipment and medium for the water heater tank that solves the above problems. A simulated pressure test can be performed on a simulation model of the tank first, and then a real pressure test can be performed on a real sample of the tank after the simulated pressure test passes, thereby improving the pass rate of the real pressure test, reducing the number of real pressure tests, shortening the R&D cycle, and reducing the detection cost.

[0006] In a first aspect, the present invention provides a method for detecting the safety of a water heater tank, the method comprising:

[0007] Obtaining material property parameters and a three-dimensional structure diagram of the inner tank simulation model of the water heater, wherein the material property parameters include thickness, elastic modulus, Poisson's ratio, density, yield strength, tensile strength, and fatigue curve;

[0008] Importing the material property parameters and the three-dimensional structure diagram into a pre-built structural strength analysis model, performing a simulation pressure test, and obtaining the structural stress and fatigue life of the liner simulation model;

[0009] If the ratio of the yield strength to the structural stress is within a preset ratio range, and the fatigue life is greater than a preset life threshold, a real pressure test is performed on the real sample of the inner liner corresponding to the inner liner simulation model;

[0010] If the result of the real pressure test is passed, the result of the safety test of the inner liner is passed.

[0011] Optionally, before obtaining the material property parameters and the three-dimensional structure diagram of the inner tank simulation model of the water heater, the method further includes:

[0012] The formability analysis of the inner tank of the water heater is performed to obtain the thickness of the inner tank simulation model.

[0013] Optionally, the formability analysis includes deep drawing formability analysis and local bulging analysis.

[0014] Optionally, the structural strength analysis model is a finite element model, and before importing the material property parameters and the three-dimensional structure diagram into the pre-built structural strength analysis model, the method further includes:

[0015] When constructing the finite element model, the unit types in the mesh division are selected as quadrilaterals and triangles;

[0016] The proportion of the number of triangles is smaller than the proportion of the number of quadrilaterals and is within a preset proportion range.

[0017] Optionally, after obtaining the structural stress and fatigue life of the liner simulation model, the method further includes:

[0018] If the ratio of the yield strength to the structural stress is not within the ratio range, or the fatigue life is less than or equal to the life threshold, the material property parameter is adjusted.

[0019] Optionally, after obtaining the structural stress and fatigue life of the liner simulation model, the method further includes:

[0020] If the ratio of the yield strength to the structural stress is not within the ratio range, or the fatigue life is less than or equal to the life threshold, obtaining the thinning rate of the liner simulation model;

[0021] The structure of the part with the largest thinning rate on the liner simulation model is optimized.

[0022] Optionally, the simulation pressure test and the real pressure test include a one-time pressure test and a pulse pressure test;

[0023] Wherein, the ratio of the maximum simulation pressure of the one-time pressure test to the preset rated pressure is a preset ratio.

[0024] In a second aspect, the present invention provides a safety detection device for a water heater tank, the device comprising:

[0025] An acquisition module, used to acquire material property parameters and a three-dimensional structure diagram of an inner tank simulation model of a water heater, wherein the material property parameters include thickness, elastic modulus, Poisson's ratio, density, yield strength, tensile strength and fatigue curve;

[0026] A simulation module, used to import the material property parameters and the three-dimensional structure diagram into a pre-built structural strength analysis model, perform a simulation pressure test, and obtain the structural stress and fatigue life of the liner simulation model;

[0027] A test module, for performing a real pressure test on a real liner sample corresponding to the liner simulation model if the ratio of the yield strength to the structural stress is within a preset ratio range and the fatigue life is greater than a preset life threshold;

[0028] The detection module is used to determine that if the result of the real pressure test is passed, the result of the safety test of the inner liner is passed.

[0029] In a third aspect, the present invention provides an electronic device comprising: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method described in the first aspect by executing the computer instructions.

[0030] In a fourth aspect, the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the method described in the first aspect.

[0031] The technical solution provided in the embodiments of the present invention has at least the following technical effects or advantages:

[0032] The embodiment of the present invention provides a method, device, equipment and medium for safety detection of the inner tank of a water heater, obtains the material property parameters and three-dimensional structure diagram of the inner tank simulation model of the water heater, and indicates that the inner tank must be simulated and designed first, and the material property parameters include thickness, elastic modulus, Poisson's ratio, density, yield strength, tensile strength and fatigue curve; the material property parameters and the three-dimensional structure diagram are imported into the pre-built structural strength analysis model, and a simulation pressure test is performed to obtain the structural stress and fatigue life of the inner tank simulation model, and the cost of the inner tank safety detection and the research and development cycle are reduced by the simulation pressure test; if the ratio of the yield strength to the structural stress is within the preset ratio range, and the fatigue life is greater than the preset life threshold, it means that the simulation pressure test is passed, and then the inner tank real sample corresponding to the inner tank simulation model is subjected to a real pressure test; if the result of the real pressure test is passed, it means that the current material property parameters and the three-dimensional structure are very suitable, and the result of the safety detection of the inner tank is passed. This method can improve the pass rate of the real pressure test, reduce the number of real pressure tests, shorten the research and development cycle, and reduce the detection cost.

[0033] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0035] Figure 1 It is a flow chart of a method for safety detection of a water heater tank provided by an embodiment of the present invention;

[0036] Figure 2 is a thickness schematic diagram of an inner liner simulation model provided by an embodiment of the present invention;

[0037] Figure 3 Schematic diagram of the thinning rate of a liner simulation model provided in an embodiment of the present invention ；

[0038] Figure 4 It is a simulation pressure regulation diagram of a one-time pressure test provided by an embodiment of the present invention;

[0039] Figure 5 It is a simulation pressure regulation diagram of a pulse pressure test provided by an embodiment of the present invention;

[0040] Figure 6 It is a schematic diagram of the structural stress of a simulated liner model after a simulated pressure test provided by an embodiment of the present invention;

[0041] Figure 7 It is a schematic diagram of fatigue life analysis results of a simulated liner model after a simulated pressure test provided by an embodiment of the present invention;

[0042] Figure 8 It is a schematic diagram comparing the thinning rates of the convex hull positions of an inner liner simulation model provided by an embodiment of the present invention;

[0043] Fig. 9 It is a structural block diagram of a safety detection device for a water heater tank provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0044] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0045] Figure 1 is a flow chart of a method for detecting the safety of a water heater tank provided by an embodiment of the present invention, such as Figure 1 As shown, the method includes steps S110 to S140.

[0046] Step S110, obtaining material property parameters and a three-dimensional structure diagram of the inner tank simulation model of the water heater, wherein the material property parameters include thickness, elastic modulus, Poisson's ratio, density, yield strength, tensile strength and fatigue curve.

[0047] In this embodiment, the safety of the inner tank of the water heater is affected by many factors such as structure, material selection, processing method, welding process, service environment, etc. Among these factors, structure and material selection are relatively easy to adjust, so these two factors are regarded as the core factors affecting the safety of the inner tank.

[0048] At present, in the design of the inner tank of the water heater, the designer first designs the size and capacity of the water heater based on experience, or selects materials based on experience, and uses the property parameters of the selected materials as material property parameters. Then, the formability analysis of the inner tank can be performed based on the selected materials, and the forming process of the inner tank can be simulated through the formability analysis software. After the formability analysis, the three-dimensional structure diagram of the inner tank simulation model is obtained based on the inner tank simulation model generated by the formability analysis software.

[0049] For example, the elastic modulus is 210 GPa, the Poisson's ratio is 0.3, and the density is 7850 kg / cm 3 The yield strength is 260MPa, the tensile strength is 380MPa, and the fatigue curve is the SN curve.

[0050] Optionally, before step S110, the method further includes:

[0051] The formability analysis of the inner tank of the water heater is carried out to obtain the thickness of the inner tank simulation model.

[0052] In this embodiment, the formability analysis can obtain an inner liner simulation model, and the thickness and thinning rate of each part of the inner liner simulation model can be obtained based on the inner liner simulation model. Figure 2 Schematic diagram of the thickness of a liner simulation model provided by an embodiment of the present invention. Figure 2 As shown, the thickness of the parts with different colors is different. Figure 3 FIG. 1 is a schematic diagram of a thinning rate of a liner simulation model provided in an embodiment of the present invention. Figure 3 As shown, the thinning rates of parts with different colors are different.

[0053] It should be noted that the present embodiment provides Figure 2 and Figure 3 It is a black and white picture. The normal formability analysis software displays a color picture, and the difference in thickness and thinning rate is more obvious.

[0054] Optionally, the formability analysis includes deep draw formability analysis and local bulging analysis.

[0055] In this embodiment, three deep drawing formability analyses and local bulging analyses can be performed on the inner tank of the water heater. After there is no risk of cracking during the deep drawing process and at the bulge bulging position, the thickness and thinning rate from the bottom of the inner tank simulation model to the flange edge are extracted, making the extracted thickness and thinning rate more accurate.

[0056] Step S120: Import the material property parameters and the three-dimensional structure diagram into the pre-built structural strength analysis model, perform a simulation pressure test, and obtain the structural stress and fatigue life of the liner simulation model.

[0057] In this embodiment, a simulated pressure test is first performed to reduce the overall time of the safety inspection of the inner tank of the water heater, and the simulated pressure test is more convenient and quick.

[0058] Optionally, the structural strength analysis model is a finite element model, and before step S120, the method further includes:

[0059] When constructing the finite element model, the element types in the mesh division are selected as quadrilaterals and triangles.

[0060] Among them, the proportion of the number of triangles is less than the proportion of the number of quadrilaterals, and is within a preset proportion range.

[0061] It can be understood that before the simulation pressure test, the finite element model needs to be set up. Specifically, it includes settings such as mid-surface extraction, model simplification, and mesh division. Among them, the unit type in the mesh division should be mainly quadrilateral, supplemented by triangular units, and the unit size can be determined according to the actual size and design requirements of the liner simulation model. Exemplarily, the number of triangles accounts for 3% to 5%. The unit size is 3 to 5 mm.

[0062] After all the settings are completed, the material property parameters and three-dimensional structure diagram are imported into the pre-established finite element model. Next, the working conditions of the simulated pressure test are established.

[0063] Optionally, the simulation pressure test includes a one-time pressure test and a pulse pressure test.

[0064] The ratio of the maximum simulation pressure of the one-time pressure test to the preset rated pressure is a preset ratio.

[0065] In this embodiment, the working conditions of the simulated pressure test include a one-time pressure test condition and a pulse pressure test condition. In the one-time pressure test, the magnitude of the simulated pressure should be controlled to ensure the accuracy of the test effect. For example, the preset ratio is 130%. The simulated pressure of the pulse pressure test is loaded according to the standard sine curve.

[0066] Figure 4 is a simulation pressure regulation diagram of a one-time pressure test provided by an embodiment of the present invention, such as Figure 4 As shown, the one-time pressure test method is: the simulation pressure range is 0-130% of the rated pressure value, first increase from 0MPa to the rated pressure, the pressure rise time is 15 seconds; then increase from the rated pressure to 130% of the rated pressure, the pressure rise time is 5 seconds, and maintain for 15 minutes; the rated pressure can be 0.8MPa, therefore, the maximum simulation pressure is 1.04MPa.

[0067] Figure 5 is a simulation pressure regulation diagram of a pulse pressure test provided by an embodiment of the present invention, such as Figure 5 As shown, the pulse pressure test method is: the pulse pressure test is loaded according to the standard sinusoidal curve, the loaded simulated pressure is between 15%-105% of the rated pressure, and the frequency is 25-60 times per minute; the rated pressure can be 0.8MPa, the maximum simulated pressure is 0.84MPa, and the minimum simulated pressure is 0.34MPa.

[0068] After the simulation pressure test is completed, the finite element model will output the structural stress and fatigue life of the liner simulation model.

[0069] Step S130: If the ratio of the yield strength to the structural stress is within a preset ratio range and the fatigue life is greater than a preset life threshold, a real pressure test is performed on the real liner sample corresponding to the liner simulation model.

[0070] In this embodiment, if the ratio of yield strength to structural stress is within the preset ratio range, and the fatigue life is greater than the preset life threshold, it means that the simulation pressure test of the liner simulation model has passed and meets the standard requirements. The structure and material property parameters can be used for sample production, and then a real pressure test can be performed on the real sample. Real pressure tests can be performed on multiple real samples of the liner to make the test results more accurate. For example, a real pressure test is performed on 10 real samples of the liner.

[0071] Among them, the ratio range can be 1.2-1.5, and the life threshold can be 80,000 times.

[0072] Optionally, the real pressure test includes a one-time pressure test and a pulse pressure test.

[0073] In this embodiment, the working conditions of the actual pressure test are the same as those of the simulated pressure test, and will not be described in detail here.

[0074] Optionally, before step S130, the method further includes:

[0075] If the ratio of the yield strength to the structural stress is not within the ratio range, or the fatigue life is less than or equal to the life threshold, the material property parameters are adjusted.

[0076] In this embodiment, if the ratio of yield strength to structural stress is not within the ratio range, or the fatigue life is less than or equal to the life threshold, it means that the simulation pressure test of the liner simulation model has not passed and does not meet the standard requirements. At this time, the material property parameters can be adjusted so that the adjusted liner simulation model can pass the simulation pressure test.

[0077] Figure 6 is a schematic diagram of the structural stress of a simulated liner model after a simulated pressure test provided by an embodiment of the present invention, such as Figure 6 As shown, the structural stress of different colored parts is different, among which the structural stress of the circled part is the largest, which is the convex hull position where the two gallbladders are connected. For example, the maximum structural stress is 254MPa and the yield strength is 260MPa. The two values ​​are very close and are not within the ratio range, which means there is a risk of structural failure.

[0078] Figure 7 FIG. 1 is a schematic diagram of fatigue life analysis results of a simulated liner model after a simulated pressure test provided by an embodiment of the present invention. Figure 7As shown, the fatigue life of parts of different colors is different. For example, the fatigue life is 92469 times, which is slightly higher than the life threshold of 80000 times.

[0079] pass Figure 6 and Figure 7 It can be seen from the schematic results that the simulation pressure test failed, so the material property parameters can be adjusted to make the structural stress and fatigue life of the inner liner simulation model meet the requirements.

[0080] For example, the yield strength is increased from 260MPa to 310MPa. After the increase, the formability analysis shows that no cracking occurs in deep drawing and local bulging. The new thickness is extracted, and then the newly extracted thickness is input into the finite element model. The other material property parameters remain unchanged, and the maximum structural stress is obtained to be 254.9MPa. Figure 7 is a schematic diagram of structural stress of an inner liner simulation model after improving yield strength provided by an embodiment of the present invention, such as Figure 7 As shown in the figure, compared with the previous design, although the maximum structural stress has increased compared to 254MPa, the ratio of yield strength to structural stress meets the design requirements, so this scheme is feasible.

[0081] Optionally, before step S130, the method further includes:

[0082] If the ratio of the yield strength to the structural stress is not within the ratio range, or the fatigue life is less than or equal to the life threshold, the thinning rate of the liner simulation model is obtained; and the structure of the part with the largest thinning rate on the liner simulation model is optimized.

[0083] In this embodiment, in addition to adjusting the material property parameters, the structure of the liner simulation model can also be optimized to enable the liner simulation model to pass the simulation pressure test.

[0084] Specifically, the optimized part is determined according to the thinning rate. Generally, the part with the largest thinning rate is optimized. For example, the part with the largest thinning rate is the convex hull position where the two gallbladders are connected.

[0085] Figure 8 is a schematic diagram comparing the thinning rates of the convex hull positions of a liner simulation model provided by an embodiment of the present invention, such as Figure 8 As shown in the figure, before the structural optimization, the maximum thinning rate at the bulge position was 19.9%; the bulge position was optimized, the fillet at the bulge position was increased, and the height of the bulge was reduced. After the optimization, there was no risk of cracking at the bulge position, and the maximum thinning rate was directly reduced to 7%; the optimized liner simulation model was subjected to a simulation pressure test, and the maximum structural stress was reduced to 208.2MPa, which met the standard requirements compared with the yield strength of 260MPa, and the scheme was feasible.

[0086] Step S140: If the result of the real pressure test is passed, the result of the safety test of the inner liner is passed.

[0087] In this embodiment, if the simulated pressure test passes, a real pressure test is carried out. If the surface of the real sample of the inner liner has no porcelain bursting, no cracks, no obvious deformation and no leakage after the real pressure test, the test result is passed. At this time, the inner liner fully meets the requirements, the result of the safety test of the inner liner is passed, and mass production can be carried out.

[0088] If the result of the actual pressure test is failed, the result of the safety test of the inner liner is also failed, and the material property parameters can be readjusted or the structure of the inner liner can be optimized.

[0089] Based on the same inventive concept, the embodiment of the present invention also provides a safety detection device for the inner tank of a water heater. Fig. 9 is a structural block diagram of a safety detection device for a water heater tank provided by an embodiment of the present invention, such as Fig. 9 As shown, the device 900 includes an acquisition module 901 , a simulation module 902 , a test module 903 and a detection module 904 .

[0090] An acquisition module 901 is used to acquire material property parameters and a three-dimensional structure diagram of an inner tank simulation model of a water heater, wherein the material property parameters include thickness, elastic modulus, Poisson's ratio, density, yield strength, tensile strength and fatigue curve;

[0091] The simulation module 902 is used to import the material property parameters and the three-dimensional structure diagram into the pre-built structural strength analysis model, perform a simulation pressure test, and obtain the structural stress and fatigue life of the liner simulation model;

[0092] The test module 903 is used to perform a real pressure test on the real sample of the inner liner corresponding to the inner liner simulation model if the ratio of the yield strength to the structural stress is within a preset ratio range and the fatigue life is greater than a preset life threshold;

[0093] The detection module 904 is used to check that if the result of the real pressure test is passed, the result of the safety test of the inner liner is passed.

[0094] Optionally, the device 900 further includes:

[0095] The analysis module is used to perform formability analysis on the inner tank of the water heater and obtain the thickness of the inner tank simulation model.

[0096] Optionally, the formability analysis includes deep draw formability analysis and local bulging analysis.

[0097] Optionally, the structural strength analysis model is a finite element model, and the device 900 further includes:

[0098] A construction module is used to select the unit type in mesh division as quadrilateral and triangle when constructing a finite element model;

[0099] Among them, the proportion of the number of triangles is less than the proportion of the number of quadrilaterals, and is within a preset proportion range.

[0100] Optionally, the device 900 further includes:

[0101] The adjustment module is used for adjusting the material property parameters if the ratio of the yield strength to the structural stress is not within the ratio range or the fatigue life is less than or equal to the life threshold.

[0102] Optionally, the apparatus 900 further includes an optimization module, configured to:

[0103] If the ratio of the yield strength to the structural stress is not within the ratio range, or the fatigue life is less than or equal to the life threshold, the thinning rate of the liner simulation model is obtained;

[0104] Optimize the structure of the area with the largest thinning rate on the liner simulation model.

[0105] Optionally, the simulated pressure test and the real pressure test include a one-time pressure test and a pulse pressure test;

[0106] The ratio of the maximum simulation pressure of the one-time pressure test to the preset rated pressure is a preset ratio.

[0107] It can be understood that the device provided in the above embodiment is only illustrated by the division of the above functional modules. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0108] An embodiment of the present invention further provides an electronic device, which may include a processor and a memory, wherein the processor and the memory may be communicatively connected to each other via a bus or other means.

[0109] The processor may be a central processing unit (CPU) or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application.

[0110] The memory may include a large capacity memory for data or instructions. By way of example and not limitation, the memory may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. Where appropriate, the memory may include a removable or non-removable (or fixed) medium. Where appropriate, the memory may be inside or outside the electronic device. In a particular embodiment, the memory may be a non-volatile solid-state memory.

[0111] In one example, the memory may be a read-only memory (ROM). In one example, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM), or a flash memory, or a combination of two or more of these.

[0112] The processor implements any one of the water heater tank safety detection methods in the above embodiments by reading and executing computer program instructions stored in the memory.

[0113] In one example, the electronic device may further include a communication interface and a bus. Among them, the processor, memory, and communication interface are connected through a bus and communicate with each other. The communication interface is mainly used to realize the communication between the modules, devices, units and / or devices in the embodiment of the present application. Where appropriate, the bus may include one or more buses.

[0114] In addition, in combination with the safety detection method of the water heater tank in the above embodiment, the embodiment of the present invention can provide a computer-readable storage medium for implementation. The computer-readable storage medium stores computer program instructions; when the computer program instructions are executed by the processor, any one of the safety detection methods of the water heater tank in the above embodiment is implemented.

[0115] The technical solutions in the above embodiments of the present application have at least the following technical effects or advantages:

[0116] The embodiment of the present invention provides a method, device, equipment and medium for safety detection of the inner tank of a water heater, obtains the material property parameters and three-dimensional structure diagram of the inner tank simulation model of the water heater, and indicates that the inner tank must be simulated and designed first, and the material property parameters include thickness, elastic modulus, Poisson's ratio, density, yield strength, tensile strength and fatigue curve; the material property parameters and the three-dimensional structure diagram are imported into the pre-built structural strength analysis model, and a simulation pressure test is performed to obtain the structural stress and fatigue life of the inner tank simulation model, and the cost of the inner tank safety detection and the research and development cycle are reduced by the simulation pressure test; if the ratio of the yield strength to the structural stress is within the preset ratio range, and the fatigue life is greater than the preset life threshold, it means that the simulation pressure test is passed, and then the inner tank real sample corresponding to the inner tank simulation model is subjected to a real pressure test; if the result of the real pressure test is passed, it means that the current material property parameters and the three-dimensional structure are very suitable, and the result of the safety detection of the inner tank is passed. This method can improve the pass rate of the real pressure test, reduce the number of real pressure tests, shorten the research and development cycle, and reduce the detection cost.

[0117] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0118] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the present invention, various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting the intention that the claimed invention requires more features than those explicitly recited in each claim. More specifically, as reflected in the claims below, inventive aspects lie in less than all the features of the individual embodiments disclosed above. Therefore, the claims that follow the specific embodiment are hereby expressly incorporated into the specific embodiment, with each claim itself serving as a separate embodiment of the present invention.

[0119] It should be noted that the above embodiments illustrate the present invention rather than limit it, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets shall not be construed as a limitation on the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "one" or "an" preceding a component does not exclude the presence of a plurality of such components. The present invention may be implemented by means of hardware comprising several different components and by means of appropriately programmed computers. In a unit claim enumerating several devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc., does not indicate any order. These words may be interpreted as names.

Claims

1. A method for detecting the safety of a water heater tank, characterized in that: The method comprises: Obtaining material property parameters and a three-dimensional structure diagram of the inner tank simulation model of the water heater, wherein the material property parameters include thickness, elastic modulus, Poisson's ratio, density, yield strength, tensile strength, and fatigue curve; Importing the material property parameters and the three-dimensional structure diagram into a pre-built structural strength analysis model, performing a simulation pressure test, and obtaining the structural stress and fatigue life of the liner simulation model; If the ratio of the yield strength to the structural stress is within a preset ratio range, and the fatigue life is greater than a preset life threshold, a real pressure test is performed on the real sample of the inner liner corresponding to the inner liner simulation model; If the result of the real pressure test is passed, the result of the safety test of the inner liner is passed.

2. The safety detection method for the water heater tank according to claim 1, characterized in that: Before obtaining the material property parameters and the three-dimensional structure diagram of the inner tank simulation model of the water heater, the method further includes: The formability analysis of the inner tank of the water heater is performed to obtain the thickness of the inner tank simulation model.

3. The safety detection method for the water heater tank according to claim 2, characterized in that: The formability analysis includes deep drawing formability analysis and local bulging analysis.

4. The safety detection method for the water heater tank according to claim 1, characterized in that: The structural strength analysis model is a finite element model. Before importing the material property parameters and the three-dimensional structure diagram into the pre-built structural strength analysis model, the method further includes: When constructing the finite element model, the unit types in the mesh division are selected as quadrilaterals and triangles; The proportion of the number of triangles is smaller than the proportion of the number of quadrilaterals and is within a preset range of proportions.

5. The safety detection method for the water heater tank according to claim 1, characterized in that: After obtaining the structural stress and fatigue life of the liner simulation model, the method further includes: If the ratio of the yield strength to the structural stress is not within the ratio range, or the fatigue life is less than or equal to the life threshold, the material property parameter is adjusted.

6. The method for detecting the safety of the water heater tank according to claim 1, characterized in that: After obtaining the structural stress and fatigue life of the liner simulation model, the method further includes: If the ratio of the yield strength to the structural stress is not within the ratio range, or the fatigue life is less than or equal to the life threshold, obtaining the thinning rate of the liner simulation model; The structure of the part with the largest thinning rate on the liner simulation model is optimized.

7. The method for detecting the safety of the inner tank of a water heater according to claim 1, characterized in that: The simulation pressure test and the real pressure test include a one-time pressure test and a pulse pressure test; Wherein, the ratio of the maximum simulation pressure of the one-time pressure test to the preset rated pressure is a preset ratio.

8. A safety detection device for a water heater tank, characterized in that: The device comprises: An acquisition module, used to acquire material property parameters and a three-dimensional structure diagram of an inner tank simulation model of a water heater, wherein the material property parameters include thickness, elastic modulus, Poisson's ratio, density, yield strength, tensile strength and fatigue curve; A simulation module, used to import the material property parameters and the three-dimensional structure diagram into a pre-built structural strength analysis model, perform a simulation pressure test, and obtain the structural stress and fatigue life of the liner simulation model; A test module, for performing a real pressure test on a real liner sample corresponding to the liner simulation model if the ratio of the yield strength to the structural stress is within a preset ratio range and the fatigue life is greater than a preset life threshold; The detection module is used to determine that if the result of the real pressure test is passed, the result of the safety test of the inner liner is passed.

9. An electronic device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method according to any one of claims 1 to 7 by executing the computer instructions.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to cause the computer to execute the method according to any one of claims 1 to 7.

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