Diaphragm compressor with corrected diaphragm cavity molded line edge and molded line design method

Abstract

The invention discloses a diaphragm compressor with a diaphragm cavity molded line edge correction function and a molded line design method, the diaphragm compressor is provided with a diaphragm cavity molded line of the diaphragm compressor formed by combining a first diaphragm cavity molded line and a second diaphragm cavity molded line according to a segmentation proportion, the first diaphragm cavity molded line is a single-index diaphragm cavity molded line, and the second diaphragm cavity molded line is used for edge stress correction; reducing the maximum stress of the middle part of the mold cavity molded line by adjusting the design parameters of the first mold cavity molded line, and reducing the maximum stress of the edge part of the mold cavity molded line by adjusting the design parameters of the second mold cavity molded line; and the first diaphragm cavity molded line and the second diaphragm cavity molded line are continuous and monotonous without sharp points, so that the combined edge-corrected diaphragm cavity molded line of the diaphragm compressor is formed. And carrying out multi-target parameter optimization calculation to adjust the design parameters of the first die cavity molded line and the second die cavity molded line on the premise of meeting the design requirements. According to the method, the problems of insufficient optimization parameters and limited optimization range of traditional single-index molded line design can be solved, the reliability of the diaphragm compressor can be optimized, and the service life of the diaphragm can be prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of diaphragm compressors, and in particular to a diaphragm compressor with a modified diaphragm cavity profile edge and a profile design method. Background Art

[0002] A diaphragm compressor is a positive displacement compressor that uses a diaphragm to separate the oil side and the gas side. Its working principle is to drive the crankshaft connecting rod through a motor to drive the piston to reciprocate, thereby pressurizing and depressurizing the high-pressure oil, and then use the high-pressure oil to push the diaphragm to compress and discharge the gas. Diaphragm compressors are widely used in the hydrogen energy industry due to their good sealing and large pressure ratio. In particular, hydrogen refueling stations are one of their important usage scenarios. The diaphragm life, volumetric efficiency and diaphragm head strength issues are very critical and difficult issues in the research and development of diaphragm compressors. The diaphragm is a key component in the stable operation of the diaphragm compressor, and its working performance can directly affect the reliability of the compressor operation. In the process of diaphragm damage, the main forms of damage are collapse, distortion, wear and cracks, and mechanical fatigue. Damage to the diaphragm will cause damage to its mechanical properties, and severe cases may even cause large economic losses.

[0003] At present, the diaphragm compressor diaphragm cavity profile widely used in China is the single-exponent small deflection diaphragm cavity profile. After long-term practice and verification, it has good reliability and practical basis. However, in the process of developing and designing new diaphragm compressor models, the stress at the edge of the diaphragm cavity profile increases significantly after the maximum deflection of the diaphragm cavity is increased. The same diaphragm compressor gas volume and smaller stress can only be achieved by reducing the profile index or increasing the diaphragm head diameter, and the parameter optimization range is limited. With the development of diaphragm compressor technology, the research and development of new high-pressure and high-speed models, and the urgent needs of market demand, the optimization of the diaphragm cavity profile based on the diaphragm theoretical force calculation is conducive to improving the reliability of diaphragm compressors and reducing costs. Summary of the invention

[0004] The purpose of the present invention is to address the problems in the above-mentioned prior art and to provide a diaphragm compressor and a profile design method with modified membrane cavity profile edges, which can overcome the problems of insufficient optimization parameters and limited optimization range of traditional single-exponential profile design, thereby adapting to diversified market demands, optimizing the reliability of diaphragm compressors and increasing the life of the diaphragm.

[0005] In order to achieve the above object, the present invention has the following technical solutions:

[0006] In a first aspect, a diaphragm compressor with a modified diaphragm cavity profile line is provided, wherein the diaphragm cavity profile line of the diaphragm compressor is formed by combining a first diaphragm cavity profile line and a second diaphragm cavity profile line in a segmented ratio, wherein the first diaphragm cavity profile line is a single-exponential diaphragm cavity profile line, and the second diaphragm cavity profile line is used for edge stress correction; the maximum stress in the middle part of the diaphragm cavity profile line is reduced by adjusting the design parameters of the first diaphragm cavity profile line, and the maximum stress in the edge part of the diaphragm cavity profile line is reduced by adjusting the design parameters of the second diaphragm cavity profile line; the first diaphragm cavity profile line and the second diaphragm cavity profile line are continuous, monotonous and without sharp points, forming a combined diaphragm cavity profile line of the diaphragm compressor with modified edges.

[0007] As a preferred solution, a multi-objective parameter optimization calculation is performed to adjust the design parameters of the first membrane cavity profile and the second membrane cavity profile on the premise of meeting the design requirements.

[0008] In a second aspect, a method for designing a diaphragm compressor cavity profile with modified cavity profile edge is provided, comprising:

[0009] Design single-index membrane cavity profile according to design requirements;

[0010] By performing stress analysis, the area with the largest stress in the single-exponential membrane cavity profile is obtained;

[0011] If the area with the greatest stress is concentrated at the edge of the membrane cavity, the single-exponential membrane cavity profile is segmented to obtain the first membrane cavity profile and the second membrane cavity profile, and the optimal curve segmentation ratio is found to modify the second membrane cavity profile to reduce the edge stress;

[0012] The first membrane cavity profile line and the second membrane cavity profile line are combined to reduce the maximum stress in the middle of the membrane cavity profile line by adjusting the design parameters of the first membrane cavity profile line, and reduce the maximum stress in the edge of the membrane cavity profile line by adjusting the design parameters of the second membrane cavity profile line;

[0013] On the premise of meeting the design requirements, multi-objective parameter optimization calculation is carried out, the design parameters of the first membrane cavity profile and the second membrane cavity profile are adjusted, and the membrane cavity profile of the diaphragm compressor is determined through comparative analysis.

[0014] As a preferred solution, when designing a single-exponential membrane cavity profile, the design requirements include design gas volume requirements, membrane material strength requirements, and design size requirements.

[0015] As a preferred solution, by performing stress analysis, the area with the largest stress in the single-exponential membrane cavity profile is obtained and then judged:

[0016] If the area with the greatest stress is concentrated in the middle of the membrane cavity and exceeds the strength requirement of the membrane material, the single-exponential membrane cavity profile is redesigned, and the single-exponential profile deflection and membrane cavity radius are modified to reduce the stress at the center of the membrane cavity profile;

[0017] If the area with the greatest stress is concentrated in the middle of the diaphragm cavity and is less than the strength requirement of the diaphragm material, it is determined that the designed single-exponential profile has qualified mechanical properties and does not need to be modified. It is determined as the final diaphragm compressor diaphragm cavity profile.

[0018] As a preferred solution, the step of finding the optimal curve segment ratio and modifying the second membrane cavity profile to reduce edge stress includes:

[0019] Design the modified membrane cavity profile described by the following formula:

[0020]

[0021] Where: X is the modified membrane cavity line equation; HA is the first membrane cavity line equation, that is, the single exponential membrane cavity line equation; HB is the second membrane cavity line equation; r is the membrane cavity radius; x p is the ratio of the membrane cavity radius corresponding to the first membrane cavity profile line to the maximum membrane cavity radius; R is the maximum membrane cavity radius;

[0022] The second membrane cavity line equation HB satisfies the following expression:

[0023]

[0024] Where D is the derivative operator;

[0025] The following expression is satisfied at the connection point P of the first membrane cavity line equation HA and the second membrane cavity line equation HB:

[0026]

[0027] In the formula, Represents a mathematical symbol, which has a unique solution;

[0028] Perform stress analysis on the modified membrane cavity profile that meets the conditions to obtain the area with the largest stress in the modified membrane cavity profile. If the edge stress is still greater than the set value, reduce the segment ratio x. p , until the requirements are met.

[0029] As a preferred solution, the expression for multi-objective parameter optimization calculation under the premise of meeting the design requirements is as follows:

[0030]

[0031] Where: δ is the stress of the membrane cavity profile; V is the volume of the membrane cavity designed by the membrane cavity profile; R is the maximum radius of the membrane cavity profile.

[0032] In a third aspect, a diaphragm compressor diaphragm cavity profile design system for diaphragm cavity profile edge correction is provided, comprising:

[0033] Single-exponential membrane cavity profile design module, used to design single-exponential membrane cavity profile according to design requirements;

[0034] Stress analysis module, used to obtain the area with the maximum stress in the single-exponential membrane cavity profile by performing stress analysis;

[0035] The curve segmentation module is used to segment the single-exponential membrane cavity profile to obtain the first membrane cavity profile and the second membrane cavity profile if the area with the greatest stress is concentrated at the edge of the membrane cavity, find the optimal curve segmentation ratio, and modify the second membrane cavity profile to reduce the edge stress;

[0036] A profile design parameter adjustment module is used to combine the first membrane cavity profile and the second membrane cavity profile, reduce the maximum stress in the middle of the membrane cavity profile by adjusting the design parameters of the first membrane cavity profile, and reduce the maximum stress in the edge of the membrane cavity profile by adjusting the design parameters of the second membrane cavity profile;

[0037] The multi-objective parameter optimization module is used to perform multi-objective parameter optimization calculations on the premise of meeting design requirements, adjust the design parameters of the first membrane cavity profile and the second membrane cavity profile, and determine the membrane cavity profile of the diaphragm compressor through comparative analysis.

[0038] In a fourth aspect, an electronic device is provided, including:

[0039] A memory storing at least one instruction; and a processor executing the instruction stored in the memory to implement the diaphragm compressor diaphragm cavity profile edge correction method.

[0040] In a fifth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, a method for designing a diaphragm compressor diaphragm cavity profile edge correction is implemented.

[0041] Compared with the prior art, the present invention has at least the following beneficial effects:

[0042] By optimizing the design of the diaphragm compressor cavity profile, it can be used as a correction and supplement to the traditional single-index diaphragm compressor profile, so that the traditional single-index diaphragm compressor profile has more profile design parameters and optimization methods to adapt to the current diversified market demand and improve the diaphragm life and overall reliability of the diaphragm compressor. The present invention modifies the edge profile on the basis of the traditional single-index diaphragm cavity profile design, and the combined new profile can enhance the flexibility of the profile design, adjust the stress distribution of the diaphragm of the diaphragm compressor, reduce the maximum stress, and improve the life of the diaphragm and the overall reliability of the diaphragm compressor.

[0043] Furthermore, the diaphragm compressor diaphragm cavity profile edge correction design method of the present invention is beneficial for the diaphragm cavity profile to adapt to a variety of different specific industrial application scenarios, improve the overall performance and safety of the diaphragm compressor, and thus reduce maintenance costs through multi-profile parameter optimization design with maximum stress, diaphragm cavity radius and diaphragm cavity volume as optimization targets. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0045] Figure 1 A schematic flow chart of a method for designing a diaphragm compressor cavity profile with edge correction of the cavity profile according to an embodiment of the present invention;

[0046] FIG2(a) is a conventional single-exponential membrane cavity profile disturbance curve with a membrane cavity radius of R=360 mm;

[0047] FIG2( b ) is a graph showing a stress distribution curve of a conventional single-exponential membrane cavity with a membrane cavity radius of R=360 mm;

[0048] FIG. 3( a ) is a diagram showing the segment ratio x of an embodiment of the present invention. p = 0.9 arc edge correction membrane cavity line disturbance curve;

[0049] FIG. 3( b ) is a diagram showing the segment ratio x of an embodiment of the present invention. p = 0.9 arc edge correction membrane cavity line stress distribution curve;

[0050] FIG. 4( a ) is a diagram showing the segment ratio x of an embodiment of the present invention. p = 0.85 arc edge correction membrane cavity line disturbance curve;

[0051] FIG. 4( b ) is a diagram showing the segment ratio x of an embodiment of the present invention. p = 0.85 arc edge correction membrane cavity line stress distribution curve;

[0052] FIG5( a ) is a single exponential membrane cavity profile disturbance curve diagram of a membrane cavity radius R=371 mm according to an embodiment of the present invention;

[0053] FIG5( b ) is a graph showing the stress distribution curve of the single exponential membrane cavity profile with a membrane cavity radius of R=371 mm according to an embodiment of the present invention;

[0054] FIG. 6( a ) is a diagram showing the segment ratio x of an embodiment of the present invention. p = 0.85 ellipse edge correction membrane cavity line disturbance curve;

[0055] FIG. 6( b ) is a diagram showing the segment ratio x of an embodiment of the present invention. p =0.85 Ellipse edge corrected membrane cavity line stress distribution curve. DETAILED DESCRIPTION

[0056] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, ordinary technicians in this field can also obtain other embodiments without making creative work.

[0057] The embodiment of the present invention discloses a diaphragm compressor with edge correction of a diaphragm cavity profile. The diaphragm cavity profile of the diaphragm compressor is formed by combining a first diaphragm cavity profile and a second diaphragm cavity profile in a segmented ratio. The first diaphragm cavity profile is a single-exponential diaphragm cavity profile, and the second diaphragm cavity profile is used for edge stress correction. The maximum stress in the middle of the diaphragm cavity profile is reduced by adjusting the design parameters of the first diaphragm cavity profile, and the maximum stress at the edge of the diaphragm cavity profile is reduced by adjusting the design parameters of the second diaphragm cavity profile. The first diaphragm cavity profile and the second diaphragm cavity profile are combined to form a combined edge-corrected diaphragm compressor diaphragm cavity profile. Multi-objective parameter optimization calculation is performed to adjust the design parameters of the first diaphragm cavity profile and the second diaphragm cavity profile on the premise of meeting the design requirements.

[0058] like Figure 1 As shown, the diaphragm compressor diaphragm cavity line design method for diaphragm cavity line edge correction according to an embodiment of the present invention includes:

[0059] Step 1: First, based on the design requirement AIM, a single-index membrane cavity profile that meets the requirements is designed according to the specific design requirements such as design gas volume requirements, diaphragm material strength requirements, and design size requirements.

[0060] Step 2: Perform stress analysis on the single-exponential membrane cavity profile that meets the requirements to obtain the area with the maximum stress in the existing designed membrane cavity profile.

[0061] Step 3 STEP_3: If the area with the largest stress is concentrated in the middle of the membrane cavity and is greater than the strength requirement of the diaphragm material, it is necessary to return to STEP_1 and modify the single-exponential profile deflection and the membrane cavity radius to reduce the central stress of the membrane cavity profile; if the area with the largest stress is concentrated in the middle of the membrane cavity and is less than the strength requirement of the diaphragm material, it means that the single-exponential profile has better mechanical properties and no further modification is required, and enter the profile determination STEP_7; if the area with the largest stress is concentrated at the edge of the membrane cavity, enter the next step of profile optimization design STEP_4.

[0062] Step 4: Find the optimal curve segmentation ratio xp , design the modified membrane cavity profile described by the following formula:

[0063]

[0064] Where: X-modified membrane cavity line equation; HA-first membrane cavity line equation, taken as a single exponential membrane cavity line equation; HB-second membrane cavity line equation; r-membrane cavity radius; x p -The ratio of the membrane cavity radius corresponding to the first membrane cavity profile line to the maximum membrane cavity radius; R-the maximum membrane cavity radius.

[0065] The single exponential diaphragm cavity profile equation used in general diaphragm compressors can be described by the following formula:

[0066]

[0067] Where: HA max is the maximum deflection of the single-exponential membrane cavity line; z is the single-exponential membrane cavity line index.

[0068] The second membrane cavity line equation should satisfy the following expression:

[0069]

[0070] Where: D is the derivative operator.

[0071] The following expression should be satisfied at the connection point P of the first membrane cavity line equation HA and the second membrane cavity line equation HB:

[0072]

[0073] Where: -A mathematical symbol for which there is a unique solution.

[0074] Step 5: Perform stress analysis on the modified membrane cavity profile that meets the conditions to obtain the area with the largest stress in the modified membrane cavity profile. If the edge stress is still large, it is necessary to reduce the segment ratio x. p .

[0075] Step 6: Combine the selected single exponential profile HA and the second membrane cavity profile HB, reduce the maximum stress in the middle of the membrane cavity profile by adjusting the design parameters of the single exponential profile HA, and reduce the maximum stress at the edge of the membrane cavity profile by adjusting the design parameters of the second membrane cavity profile HB. Perform multi-objective parameter optimization calculations on the premise of meeting the design requirement AIM. The parameter optimization process can be described by the following formula:

[0076]

[0077] Where: δ-the stress of the membrane cavity profile; V-the volume of the membrane cavity designed by the membrane cavity profile; R-the maximum radius of the membrane cavity profile.

[0078] STEP_7: Determine the final profile parameters through comparative analysis.

[0079] Example 2

[0080] STEP_1: Single exponential line design

[0081] A single-index diaphragm compressor diaphragm cavity profile has the following profile design parameters: single-index diaphragm cavity profile HA max

[0082] =10.5mm, single-exponential membrane cavity profile index z=7.2; single-exponential membrane cavity profile maximum radius R=360mm.

[0083] STEP_2: Single exponential linear stress analysis

[0084] Furthermore, as shown in Figure 2(a) and Figure 2(b), the different stress conditions in the radial direction of the single-exponential membrane cavity profile are calculated. It can be seen that the stress at the edge of the profile is larger and higher than the allowable membrane cavity stress intensity δ 许用 =210MPa.

[0085] STEP_3: Edge stress concentration needs to be corrected

[0086] Furthermore, the above-mentioned membrane cavity edge profile is modified. Segment ratio x p Select by the following formula:

[0087] δ(x p R)=δ 许用

[0088] From this, we can estimate the segmentation points of the single exponential line HA and the second membrane cavity line HB. p =0.9.

[0089] STEP_4: Use arc to correct edge profile

[0090] Optionally, the second membrane cavity profile HB is designed to be an arc segment. A general arc segment profile can be described as:

[0091] (xX circle ) 2 +(yY circle ) 2 =1

[0092] Where: (X circle ,Y circle )-coordinates of the center of the arc segment; (x,y)-coordinates of any point.

[0093] The arc segment profile equation can be solved by the aforementioned profile design method as follows:

[0094]

[0095] STEP_5: Modify the linear stress analysis. The stress is large and you need to return to STEP_4.

[0096] Furthermore, as shown in FIG3(a) and FIG3(b), the stress analysis of the combined modified diaphragm cavity profile X is solved and its stress distribution is calculated. It can be seen that the stress at the edge is still large and exceeds the allowable stress of the diaphragm.

[0097] Again, STEP_4: Use arc to correct edge profile

[0098] Further, adjust the segmentation point and take x p =0.85, recalculate the arc line equation as follows:

[0099]

[0100] Again, STEP_5: Modified Linear Stress Analysis

[0101] Furthermore, as shown in FIG. 4( a ) and FIG. 4( b ), the stress analysis of the above-mentioned combined modified diaphragm cavity profile X is solved, and its stress distribution is calculated. It can be seen that the stress at the edge is significantly reduced, and the maximum stress of the entire diaphragm is less than the allowable stress of the diaphragm.

[0102] STEP_6:

[0103] (1) Comparative analysis of single exponential profiles

[0104] Furthermore, as shown in FIG5(a) and FIG5(b), by comparing the stress distribution of the traditional single exponential profile with a membrane cavity radius R=371 mm, it can be seen that although the membrane cavity radius R is adjusted, the stress at its edge is still relatively large. Therefore, the above-mentioned edge membrane cavity modified profile X has a more obvious advantage.

[0105] (2) Comparative analysis of elliptical modified profiles

[0106] Optionally, the second membrane cavity profile HB is designed to be an ellipse segment. A general ellipse segment profile can be described as:

[0107]

[0108] Where: (X elliptical ,Y elliptical )-Coordinates of the center of the ellipse segment.

[0109] Take the segment point x p=0.85, the equation of the ellipse segment profile can be solved by the above profile design method as follows:

[0110]

[0111] Furthermore, as shown in Figure 6(a) and Figure 6(b), the stress analysis of the combined modified diaphragm cavity profile X is solved and its stress distribution is calculated. It can be seen that the stress at the edge is also significantly reduced, and the overall diaphragm stress is less than the allowable stress. Therefore, the diaphragm compressor profile with edge correction can reduce the edge diaphragm cavity stress to meet the allowable stress requirements.

[0112] (3) Comparative analysis of different profiles

[0113] Furthermore, the membrane cavity volume V and maximum stress δ of the above different profile schemes are max The comparison is shown in the following table:

[0114]

[0115] STEP_7: Determine the type line

[0116] Furthermore, an edge-corrected diaphragm compressor diaphragm cavity profile and an optimization design method are provided. In this embodiment, the arc and elliptical corrected profiles have good stress distribution and can be used as a preferred solution.

[0117] Thereby, an edge-corrected diaphragm compressor diaphragm cavity profile and an optimized design method are realized, which can serve as a correction and supplement to the traditional single-exponential diaphragm compressor profile, so that the traditional single-exponential diaphragm compressor profile has more profile design parameters and optimization methods, so that it can adapt to the current diversified market demands and improve the diaphragm life and overall reliability of the diaphragm compressor.

[0118] An embodiment of the present invention further provides an electronic device, characterized in that it includes:

[0119] A memory storing at least one instruction; and a processor executing the instruction stored in the memory to implement the diaphragm compressor diaphragm cavity profile edge correction method.

[0120] An embodiment of the present invention further provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements a method for designing a diaphragm compressor diaphragm cavity profile edge correction.

[0121] Exemplarily, the instructions stored in the memory may be divided into one or more modules / units, which are stored in a computer-readable storage medium and executed by the processor to complete the diaphragm compressor diaphragm cavity profile design method for diaphragm cavity profile edge correction of the present invention. The one or more modules / units may be a series of computer-readable instruction segments capable of completing a specific function, which are used to describe the execution process of the computer program in the server.

[0122] The electronic device may be a computing device such as a smart phone, a notebook, a PDA, and a cloud server. The electronic device may include, but is not limited to, a processor and a memory. Those skilled in the art will appreciate that the electronic device may also include more or fewer components, or a combination of certain components, or different components, for example, the electronic device may also include an input / output device, a network access device, a bus, etc.

[0123] The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0124] The memory may be an internal storage unit of the server, such as a hard disk or memory of the server. The memory may also be an external storage device of the server, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the server. Furthermore, the memory may include both an internal storage unit of the server and an external storage device. The memory is used to store the computer-readable instructions and other programs and data required by the server. The memory may also be used to temporarily store data that has been output or is to be output.

[0125] It should be noted that the information interaction, execution process and other contents between the above-mentioned module units are based on the same concept as the method embodiment. Their specific functions and technical effects can be found in the method embodiment part and will not be repeated here.

[0126] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0127] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, which can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may at least include: any entity or device that can carry the computer program code to the camera device / terminal device, recording medium, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal and software distribution medium. For example, a USB flash drive, a mobile hard disk, a disk or an optical disk.

[0128] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0129] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A diaphragm compressor with modified membrane cavity profile edge, characterized in that: The diaphragm cavity profile of a diaphragm compressor is formed by combining a first diaphragm cavity profile and a second diaphragm cavity profile in a segmented ratio, wherein the first diaphragm cavity profile is a single-exponential diaphragm cavity profile, and the second diaphragm cavity profile is used for edge stress correction; the maximum stress in the middle part of the diaphragm cavity profile is reduced by adjusting the design parameters of the first diaphragm cavity profile, and the maximum stress at the edge of the diaphragm cavity profile is reduced by adjusting the design parameters of the second diaphragm cavity profile; the first diaphragm cavity profile and the second diaphragm cavity profile are continuous, monotonous and without sharp points, forming a combined edge-corrected diaphragm cavity profile of a diaphragm compressor.

2. The diaphragm compressor with modified membrane cavity profile edge according to claim 1, characterized in that: Under the premise of meeting the design requirements, multi-objective parameter optimization calculation is performed to adjust the design parameters of the first membrane cavity profile and the second membrane cavity profile.

3. A method for designing a diaphragm compressor cavity profile with modified cavity profile edge, characterized in that: include: Design single-index membrane cavity profile according to design requirements; By performing stress analysis, the area with the largest stress in the single-exponential membrane cavity profile is obtained; If the area with the greatest stress is concentrated at the edge of the membrane cavity, the single-exponential membrane cavity profile is segmented to obtain the first membrane cavity profile and the second membrane cavity profile, and the optimal curve segmentation ratio is found to modify the second membrane cavity profile to reduce the edge stress; The first membrane cavity profile line and the second membrane cavity profile line are combined to reduce the maximum stress in the middle of the membrane cavity profile line by adjusting the design parameters of the first membrane cavity profile line, and reduce the maximum stress in the edge of the membrane cavity profile line by adjusting the design parameters of the second membrane cavity profile line; On the premise of meeting the design requirements, multi-objective parameter optimization calculation is carried out, the design parameters of the first membrane cavity profile and the second membrane cavity profile are adjusted, and the membrane cavity profile of the diaphragm compressor is determined through comparative analysis.

4. The diaphragm compressor diaphragm cavity line design method with diaphragm cavity line edge correction according to claim 3, characterized in that: When designing a single-index membrane cavity profile, the design requirements include design gas volume requirements, diaphragm material strength requirements, and design size requirements.

5. The method for designing the diaphragm compressor cavity profile with cavity profile edge correction according to claim 3, characterized in that: By performing stress analysis, we can determine the area with the largest stress in the single-index membrane cavity profile: If the area with the greatest stress is concentrated in the middle of the membrane cavity and exceeds the strength requirement of the membrane material, the single-exponential membrane cavity profile is redesigned, and the single-exponential profile deflection and membrane cavity radius are modified to reduce the stress at the center of the membrane cavity profile; If the area with the greatest stress is concentrated in the middle of the diaphragm cavity and is less than the strength requirement of the diaphragm material, it is determined that the designed single-exponential profile has qualified mechanical properties and does not need to be modified. It is determined as the final diaphragm compressor diaphragm cavity profile.

6. The diaphragm compressor diaphragm cavity line design method with diaphragm cavity line edge correction according to claim 3, characterized in that: The step of finding the optimal curve segment ratio and modifying the second film cavity profile to reduce edge stress includes: Design the modified membrane cavity profile described by the following formula: Where: X is the modified membrane cavity line equation; HA is the first membrane cavity line equation, that is, the single exponential membrane cavity line equation; HB is the second membrane cavity line equation; r is the membrane cavity radius; x p is the ratio of the membrane cavity radius corresponding to the first membrane cavity profile line to the maximum membrane cavity radius; R is the maximum membrane cavity radius; The second membrane cavity line equation HB satisfies the following expression: Where D is the derivative operator; The following expression is satisfied at the connection point P of the first membrane cavity line equation HA and the second membrane cavity line equation HB: In the formula, Represents a mathematical symbol, which has a unique solution; Perform stress analysis on the modified membrane cavity profile that meets the conditions to obtain the area with the largest stress in the modified membrane cavity profile. If the edge stress is still greater than the set value, reduce the segment ratio x. p , until the requirements are met.

7. The diaphragm compressor diaphragm cavity line design method with diaphragm cavity line edge correction according to claim 3, characterized in that: The expression for multi-objective parameter optimization calculation under the premise of meeting the design requirements is as follows: Where: δ is the stress of the membrane cavity profile; V is the volume of the membrane cavity designed by the membrane cavity profile; R is the maximum radius of the membrane cavity profile.

8. A diaphragm compressor diaphragm cavity line design system with diaphragm cavity line edge correction, characterized in that: include: Single-exponential membrane cavity profile design module, used to design single-exponential membrane cavity profile according to design requirements; Stress analysis module, used to obtain the area with the maximum stress in the single-exponential membrane cavity profile by performing stress analysis; The curve segmentation module is used to segment the single-exponential membrane cavity profile to obtain the first membrane cavity profile and the second membrane cavity profile if the area with the greatest stress is concentrated at the edge of the membrane cavity, find the optimal curve segmentation ratio, and modify the second membrane cavity profile to reduce the edge stress; A profile design parameter adjustment module is used to combine the first membrane cavity profile and the second membrane cavity profile, reduce the maximum stress in the middle of the membrane cavity profile by adjusting the design parameters of the first membrane cavity profile, and reduce the maximum stress in the edge of the membrane cavity profile by adjusting the design parameters of the second membrane cavity profile; The multi-objective parameter optimization module is used to perform multi-objective parameter optimization calculations on the premise of meeting design requirements, adjust the design parameters of the first membrane cavity profile and the second membrane cavity profile, and determine the membrane cavity profile of the diaphragm compressor through comparative analysis.

9. An electronic device, characterized in that: include: A memory storing at least one instruction; and A processor executes instructions stored in the memory to implement the diaphragm compressor diaphragm cavity profile design method with diaphragm cavity profile edge correction as described in any one of claims 3 to 7.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method for designing the diaphragm cavity profile of a diaphragm compressor by correcting the edge of the diaphragm cavity profile as described in any one of claims 3 to 7 is implemented.

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