Gas-liquid-solid coupling dynamics simulation method and system for diaphragm compressor system

Abstract

The invention discloses a gas-liquid-solid coupling dynamic simulation method and system for a diaphragm compressor system. The method comprises the steps that different diaphragm compressor physical models in a specific application scene are summarized according to actual requirements; modular partitioning of a gas path system, an oil path system, diaphragm movement, auxiliary elements and other heat and mass transfer elements is carried out on the physical model; compiling and parameter setting are performed through an advanced modeling simulation platform AMESim language of an engineering system, and simulation calculation of the diaphragm compressor is realized in the AMESim; the simulation calculation result of the AMESim is verified, and parameter optimization and adjustment of the physical model of the diaphragm compressor are carried out through comparative analysis, so that the physical model of the diaphragm compressor meets the actual working condition operation condition; a diaphragm compressor physical model meeting the actual working condition operation condition is used, related problems are solved according to simulation requirements, and optimization type selection design is conducted on a diaphragm compressor system or structure. The complex working process of gas-liquid-solid coupling of the diaphragm compressor can be reproduced.

Description

Technical Field

[0001] The present invention relates to the technical field of diaphragm compressors, and in particular to a gas-liquid-solid coupling dynamics simulation method and system for a diaphragm compressor system. 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: the motor drives the crankshaft connecting rod to drive the piston to reciprocate to increase and release the pressure of the high-pressure oil, and then the high-pressure oil pushes the diaphragm to compress and discharge the gas. Diaphragm compressors are widely used in the hydrogen energy industry due to their good sealing and high pressure ratio, especially hydrogen refueling stations are one of their important usage scenarios.

[0003] In the process of research and development of diaphragm compressors, due to the compressibility of hydraulic oil and the leakage of hydraulic oil, maintaining the dynamic balance of the hydraulic oil quality in the diaphragm compressor cavity is a difficult problem in the design stage of diaphragm compressors. The current research and development of diaphragm compressors mainly realizes the normal operation of diaphragm compressors by rationally selecting the components of plunger oil replenishment pumps and overflow valves. In addition, the hydraulic oil pressure and hydrogen pressure of diaphragm compressors change with each other. The change in the quality of hydraulic oil in the oil cavity directly affects the exhaust volume and safety of the diaphragm compressor. In the development process of new diaphragm compressor models, sufficient experimental verification not only requires large economic investment, but also has certain risks. Due to the flammable and leaky small molecule characteristics of hydrogen, many key parameters have no measurement methods or low measurement accuracy. At the same time, the working process of diaphragm compressors involves gas-liquid-solid coupling problems such as diaphragm deformation, gas compression, hydraulic oil compression, and drive mechanism movement. It is difficult to reproduce the complex working process of diaphragm compressors only by theoretical research or numerical calculation. Current researchers cannot simultaneously calculate the multi-phase coupling complex problems such as overflow valves, plunger pumps, intake valves, exhaust valves, and diaphragm movement for 3D simulation calculations of diaphragm compressors. Therefore, how to predict and simulate the performance of diaphragm compressors is a difficult problem that is difficult to overcome in the current research and development of diaphragm compressors. Summary of the invention

[0004] The purpose of the present invention is to address the problems in the above-mentioned prior art and provide a method and system for simulating the gas-liquid-solid coupling dynamics of a diaphragm compressor system, so as to fill the defect that it is difficult to reproduce the complex working process of the gas-liquid-solid coupling of the diaphragm compressor by only theoretical research or numerical calculation, and provide new technical support for the research and development of new models of diaphragm compressors.

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

[0006] A gas-liquid-solid coupling dynamics simulation method for a diaphragm compressor system, comprising:

[0007] Summarize different diaphragm compressor physical models in specific application scenarios based on actual needs;

[0008] Modular partitioning of the diaphragm compressor physical model into gas circuit system, oil circuit system, diaphragm movement, auxiliary components and other heat and mass transfer components;

[0009] According to the physical model of the diaphragm compressor after modular partitioning, the advanced modeling and simulation platform for engineering systems AMESim language is used for writing and parameter setting, and the simulation calculation of the diaphragm compressor is realized in AMESim;

[0010] Verify the simulation calculation results of AMESim, and optimize and adjust the parameters of the diaphragm compressor physical model through comparative analysis to make the diaphragm compressor physical model meet the actual operating conditions;

[0011] Use a physical model of the diaphragm compressor that meets actual operating conditions to solve related problems based on simulation requirements and optimize the selection and design of the diaphragm compressor system or structure.

[0012] As a preferred solution, when summarizing different diaphragm compressor physical models in specific application scenarios through actual needs, the actual needs include component selection optimization design, compressor fault diagnosis, system simulation and optimization, performance prediction and verification, and research and development of new ultra-high pressure models.

[0013] As a preferred solution, the diaphragm compressor physical model includes a diaphragm compressor integrated module composed of a hydraulic cylinder drive module, a plunger pump module, a relief valve module, an intake valve module, an exhaust valve module, a hydraulic cylinder module, a diaphragm movement module, a pneumatic cylinder module and a follower valve module, as well as a data acquisition module and a data transmission module;

[0014] The hydraulic cylinder drive module is used to simulate the process of the diaphragm compressor simulating the crank-connecting rod mechanism driving the piston movement;

[0015] The plunger pump module and the relief valve module are used to simulate the oil inlet and outlet processes of the diaphragm compressor cylinder respectively;

[0016] The hydraulic cylinder module is used to simulate the effective volume movement of hydraulic oil in the diaphragm compressor cylinder.

[0017] As a preferred solution, the physical model of the diaphragm compressor after modular partitioning is written and parameterized using the AMESim language of the advanced modeling and simulation platform for engineering systems. When the simulation calculation of the diaphragm compressor is realized in AMESim, the piston movement in the hydraulic cylinder drive module is directly driven by the crank-connecting rod mechanism, and the movement law of the piston is described by the following formula:

[0018]

[0019] Where: x is the piston displacement; φ is the crankshaft angle; r is the crankshaft radius; λ is the ratio of the crankshaft radius r to the connecting rod length l; ν is the piston speed; ω is the angular velocity;

[0020] By converting the above mathematical formula into AMESim modular modeling and simulation language, a hydraulic cylinder drive module is formed and then connected to the hydraulic cylinder module.

[0021] As a preferred solution, the plunger movement of the plunger pump module is directly driven by the crank-connecting rod mechanism and its own spring structure, but there is a phase angle with the piston movement in the hydraulic cylinder drive module. The plunger movement law is described by the following formula:

[0022]

[0023] Where: x zs is the displacement of the plunger pump plunger; r is the radius of the plunger-driven eccentric wheel; θ is the rotation angle of the plunger-driven eccentric wheel; a is the eccentricity of the plunger pump driven eccentric wheel; v zs is the speed of the plunger pump plunger;

[0024] The plunger-driven eccentric is described by its phase difference with the crankshaft rotation:

[0025]

[0026] Where: The phase difference between the rotation angle of the plunger-driven eccentric and the rotation angle of the crankshaft;

[0027] By converting the above mathematical formulas into AMESim modular modeling and simulation language, a plunger pump module is formed and then connected to the hydraulic cylinder module.

[0028] As a preferred solution, the instantaneous flow of the overflow valve module is determined by the overflow valve opening, the pressure difference on both sides of the overflow valve and the medium properties, which is described by the following formula:

[0029]

[0030] Where: q oil is the instantaneous flow of the overflow valve; C df is the overflow valve inlet flow coefficient; D f is the inlet diameter of the relief valve;

[0031] Δx f is the valve core lift of the overflow valve; ρ is the density of the hydraulic oil; p oil is the oil pressure in the cavity; k s is the spring stiffness of the overflow valve; Δx spring is the compression amount of the overflow valve spring; p cis the pressure inside the overflow valve core; C db is the overflow valve outlet flow coefficient; D b is the outlet diameter of the relief valve;

[0032] Simplify the above mathematical formula and regard the overflow valve core pressure as atmospheric pressure, then:

[0033]

[0034] By converting the above mathematical formula into AMESim modular modeling and simulation language, a relief valve module is formed, which is then connected to the hydraulic cylinder module.

[0035] As a preferred solution, the intake valve module and the exhaust valve module are used to simulate the intake and exhaust processes of the air cavity volume of the diaphragm compressor, respectively, and the pneumatic cylinder module is used to simulate the gas compression process caused by the change of the air cavity volume of the diaphragm compressor;

[0036] The movement of the valve cores in the intake and exhaust valve modules is described by the following equation:

[0037]

[0038] Where: M v H is the valve core mass; vc is the displacement of the intake valve core; H vd is the displacement of the exhaust valve core; κ v is the flow coefficient; p gs is the pressure in the intake pipe; p g A is the pressure in the air chamber of the diaphragm compressor; v K is the flow area of ​​the valve core; ν H is the valve core spring stiffness; ν0 is the spring pre-compression amount;

[0039] By converting the above mathematical formulas into AMESim modular modeling and simulation language, an intake valve module and an exhaust valve module are formed, which are then connected to the pneumatic cylinder module.

[0040] As a preferred solution, by simulating the hydraulic oil entering from the plunger pump module and being discharged from the overflow valve module, the hydraulic pressure is applied to the diaphragm of the diaphragm compressor in the hydraulic cylinder module to drive the diaphragm movement in the diaphragm motion module, thereby realizing the establishment of the liquid phase flow process of the diaphragm compressor; by simulating the change of the gas volume in the pneumatic cylinder module driven by the diaphragm motion module, thereby causing the change of the gas pressure in the pneumatic cylinder module and the movement of the intake valve module and the exhaust valve module, thereby realizing the establishment of the gas phase flow process of the diaphragm compressor; by simulating the liquid phase flow process of the diaphragm compressor through the diaphragm motion module to drive the gas phase flow process, thereby realizing the establishment of the gas-liquid-solid coupling process of the diaphragm compressor;

[0041] The relationship between the maximum deflection of the diaphragm center of a single-index diaphragm compressor and the volume of the diaphragm cavity is described by the following formula:

[0042]

[0043] Where: V q is the half-cavity volume under the maximum center deflection of the diaphragm; R is the radius of the diaphragm cavity; W0 is the maximum center deflection of the diaphragm; z is the diaphragm cavity index coefficient; since the change in the diaphragm center deflection caused by the diaphragm movement is linearly related to the change in the diaphragm cavity volume, the reciprocating cylinder model is used to replace the movement of the diaphragm surface, and the above formula is converted into the AMESim modular modeling and simulation language to form a diaphragm motion module, which is connected to the hydraulic cylinder module and the pneumatic cylinder module, thereby realizing the establishment of the gas-liquid-solid coupling dynamic model of the diaphragm compressor system based on AMESim.

[0044] As a preferred solution, the diaphragm compressor integrated module includes a primary diaphragm compressor integrated module and a secondary diaphragm compressor integrated module; the primary diaphragm compressor integrated module and the secondary diaphragm compressor integrated module are the overall component integration of two single-stage diaphragm compressors, except that the unit node parameter settings are different, the primary diaphragm compressor integrated module adopts a relief valve module, and the secondary diaphragm compressor integrated module adopts a follower valve module;

[0045] The spool valve module is described by the following formula:

[0046]

[0047] Where: q oil,ylvalve is the flow rate of the servo valve; C dv D is the flow coefficient of the oil outlet of the servo valve; f is the outlet diameter of the follow-up valve; p gas,d is the exhaust pressure in the integrated module of the first-stage diaphragm compressor;

[0048] The exhaust pressure in the first-stage diaphragm compressor integrated module controls the opening and closing characteristics of the follower valve model in the second-stage diaphragm compressor integrated module through the data transmission module, thereby realizing the overflow function of the follower valve model; the above formula is converted into the AMESim modular modeling and simulation language, connected to the second-stage diaphragm compressor integrated module, and coordinated with other modules to realize the establishment of the gas-liquid-solid coupling dynamic model of the diaphragm compressor system with follower valve based on AMESim;

[0049] The output data in the first-stage diaphragm compressor integrated module and the second-stage diaphragm compressor integrated module are analyzed and modulated, and finally output to the demand user end through the data acquisition module.

[0050] A gas-liquid-solid coupling dynamics simulation system for a diaphragm compressor system, comprising:

[0051] Demand summarization module, used to summarize different diaphragm compressor physical models in specific application scenarios based on actual needs;

[0052] Physical model partitioning module, used to modularize the gas circuit system, oil circuit system, diaphragm movement, auxiliary components and other heat and mass transfer components of the diaphragm compressor physical model;

[0053] AMESim simulation calculation module is used to write and set parameters based on the physical model of the diaphragm compressor after modular partitioning through the AMESim language of the advanced modeling and simulation platform for engineering systems, and realize the simulation calculation of the diaphragm compressor in AMESim;

[0054] The physical model optimization and adjustment module is used to verify the simulation calculation results of AMESim. Through comparative analysis, the parameters of the diaphragm compressor physical model are optimized and adjusted to make the diaphragm compressor physical model meet the actual operating conditions.

[0055] The physical model selection and design module is used to use the physical model of the diaphragm compressor that meets the actual operating conditions, solve related problems according to simulation requirements, and optimize the selection and design of the diaphragm compressor system or structure.

[0056] Compared with the prior art, the present invention has at least the following beneficial effects:

[0057] Different diaphragm compressor physical models in specific application scenarios are summarized according to actual needs, and the obtained diaphragm compressor physical model is modularly partitioned into gas circuit system, oil circuit system, diaphragm movement, auxiliary components and other heat and mass transfer components for subsequent debugging and simulation operation, and then written and parameterized through the AMESim language of the advanced modeling and simulation platform for engineering systems, and the simulation calculation of the diaphragm compressor is realized in AMESim. The AMESim simulation calculation results are verified by comparing with other reliable data sets, and the parameters of the diaphragm compressor physical model are optimized and adjusted through comparative analysis, so that the diaphragm compressor physical model meets the actual operating conditions. Finally, the diaphragm compressor physical model that meets the actual operating conditions is used to solve related problems according to simulation needs, and the diaphragm compressor system or structure is optimized and designed. The present invention can realize the research on the performance characteristics of the diaphragm compressor as a whole or its components, oil circuit or gas circuit, as well as the simulation calculation of gas-liquid-solid three-phase coupling, which effectively solves the defect that the traditional method is difficult to reproduce the gas-liquid-solid coupling process of the diaphragm compressor. The simulation results are reasonable and accurate, and can be used to guide the development of new models of diaphragm compressors and the performance evaluation, analysis and fault diagnosis of existing models and other different specific application scenarios. The gas-liquid-solid coupling dynamics simulation method of the diaphragm compressor system of the present invention has good operability and reliability in the actual research and development design process, and can be used to guide the design and development work of diaphragm compressor practitioners. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0059] Figure 1 It is a schematic flow chart of a gas-liquid-solid coupling dynamics simulation method for a diaphragm compressor system according to an embodiment of the present invention;

[0060] Figure 2 Schematic diagram of a gas-liquid-solid coupling dynamics simulation model of a single-stage diaphragm compressor system according to an embodiment of the present invention;

[0061] Figure 3 This is a simulation result diagram of the diaphragm movement of a single-stage diaphragm compressor system according to an embodiment of the present invention;

[0062] Figure 4 This is a simulation result diagram of the oil pressure and air pressure changes of a single-stage diaphragm compressor system according to an embodiment of the present invention;

[0063] Figure 5 This is a simulation result diagram of the opening and closing condition and flow characteristics of the plunger pump of the single-stage diaphragm compressor system of the embodiment of the present invention;

[0064] Figure 6 This is a simulation result diagram of the opening and closing condition of the overflow valve and flow characteristics of the single-stage diaphragm compressor system according to an embodiment of the present invention;

[0065] Figure 7 Schematic diagram of a gas-liquid-solid coupling dynamics simulation model of a two-stage diaphragm compressor system according to an embodiment of the present invention;

[0066] Figure 8 This is a diagram showing the two-stage oil pressure simulation results of a two-stage diaphragm compressor system according to an embodiment of the present invention;

[0067] Fig. 9 This is a simulation result diagram of the diaphragm movement of a two-stage diaphragm compressor system according to an embodiment of the present invention;

[0068] Fig.10 It is a simulation result diagram of the opening and closing conditions of the plunger pump and the overflow valve and the flow characteristics of the gas-liquid-solid coupling dynamics simulation of the two-stage diaphragm compressor system of the embodiment of the present invention;

[0069] In the attached figure: 1-hydraulic cylinder drive module; 2-plunger pump module; 3-overflow valve module; 4-intake valve module; 5-exhaust valve module; 6-hydraulic cylinder module; 7-diaphragm movement module; 8-pneumatic cylinder module; 9-follow-up valve module; J1-first-stage diaphragm compressor integrated module; J2-second-stage diaphragm compressor integrated module; J3-data acquisition module; J4-data transmission module. DETAILED DESCRIPTION

[0070] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0071] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be fixedly connected, detachably connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two components can be wirelessly connected or wired. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical features involved in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0072] Example 1

[0073] See also Figure 1 A gas-liquid-solid coupling dynamics simulation method for a diaphragm compressor system according to an embodiment of the present invention comprises:

[0074] S1. Summarize different diaphragm compressor physical models in specific application scenarios based on actual needs;

[0075] S2. Modularize and partition the physical model of the diaphragm compressor into gas circuit system, oil circuit system, diaphragm movement, auxiliary components and other heat and mass transfer components;

[0076] S3. According to the physical model of the diaphragm compressor after modular partitioning, the advanced modeling and simulation platform for engineering systems AMESim language is used for writing and parameter setting, and the simulation calculation of the diaphragm compressor is realized in AMESim;

[0077] S4. Verify the simulation calculation results of AMESim, and optimize and adjust the parameters of the diaphragm compressor physical model through comparative analysis, so that the diaphragm compressor physical model meets the actual operating conditions;

[0078] S5. Use the physical model of the diaphragm compressor that meets the actual operating conditions to solve related problems according to simulation requirements, and optimize the selection and design of the diaphragm compressor system or structure.

[0079] In a possible implementation, step S1 summarizes the component types and diaphragm compressor system assemblies required for actual simulation needs. Specific actual needs include: component selection optimization design, compressor fault diagnosis, system simulation and optimization, performance prediction and verification, and research and development of new ultra-high pressure models.

[0080] The above-mentioned AMESim simulation method can realize the prediction and overall evaluation of the performance of diaphragm compressors. It can realize the use of simulation models to reflect the working characteristics of diaphragm compressors before the hardware system is designed and processed, which reduces the risks involved and the number of physical tests. AMESim (Advanced Modeling Environment for performing Simulation of engineering systems) is an advanced modeling and simulation platform for engineering systems. The AMESim modeling process is presented through an intuitive graphical interface. Users can establish, expand or change the model through the graphical interface without having to learn a special programming language. AMESim provides a standard and standardized secondary development platform. Users can write their own code for custom modeling and integrate custom models into the AMESim model library. AMESim has multiple simulation operation modes such as dynamic simulation, steady-state simulation, intermittent continuous simulation and batch simulation. Users can perform dynamic analysis, parameter optimization and steady-state analysis. AMESim provides linearization analysis tools, modal analysis tools, spectrum analysis tools and model simplification tools, which greatly facilitate user analysis and system optimization. AMESim comes with an intelligent solver for algorithms, which can automatically select the best integration algorithm from a variety of optional algorithms based on the mathematical characteristics of the model built by the user, and dynamically switch the integration algorithm and adjust the integration step size according to the characteristics of the system at different simulation times to shorten the simulation time and improve the simulation accuracy.

[0081] The physical model of the diaphragm compressor described in the embodiment of the present invention includes a diaphragm compressor integrated module composed of a hydraulic cylinder drive module 1, a plunger pump module 2, a relief valve module 3, an intake valve module 4, an exhaust valve module 5, a hydraulic cylinder module 6, a diaphragm movement module 7, a pneumatic cylinder module 8 and a follower valve module 9, as well as a data acquisition module J3 and a data transmission module J4.

[0082] like Figure 2As shown, the gas-liquid-solid coupling dynamics simulation model of the single-stage diaphragm compressor system of the embodiment of the present invention includes: a hydraulic cylinder drive module 1, a plunger pump module 2, a relief valve module 3, an intake valve module 4, an exhaust valve module 5, a hydraulic cylinder module 6, a diaphragm motion module 7 and a pneumatic cylinder module 8. Specifically, the hydraulic drive module 1 is used to simulate the process of the crank-connecting rod mechanism driving the piston movement, the plunger pump module 2 and the relief valve module 3 are used to simulate the oil intake and oil discharge process of the diaphragm compressor cylinder, and the hydraulic cylinder module 6 is used to simulate the effective volume movement process of the hydraulic oil of the diaphragm compressor cylinder. In this way, the model of the diaphragm compressor liquid drive system is built. The intake valve module 4 and the exhaust valve module 5 are used to simulate the intake and exhaust process of the diaphragm compressor air cavity volume, respectively, and the pneumatic cylinder module 8 is used to simulate the gas compression process caused by the change of the diaphragm compressor air cavity volume. In this way, the model of the diaphragm compressor pneumatic system is built. The diaphragm motion module 7 is used to simulate the process of the diaphragm compressor liquid drive system driving the diaphragm compressor pneumatic system to move. In this way, the movement of the diaphragm compressor diaphragm and the gas-liquid-solid coupling process are realized.

[0083] When the simulation calculation of the diaphragm compressor is realized in AMESim, the piston movement in the hydraulic cylinder drive module 1 is directly driven by the crank-connecting rod mechanism, and the movement law of the piston is described by the following formula:

[0084]

[0085] Where: x is the piston displacement; φ is the crankshaft angle; r is the crankshaft radius; λ is the ratio of the crankshaft radius r to the connecting rod length l; v is the piston speed; ω is the angular velocity;

[0086] By converting the above mathematical formula into AMESim modular modeling simulation language, a hydraulic cylinder drive module 1 is formed, which is then connected to the hydraulic cylinder module 6.

[0087] The plunger movement of the plunger pump module 2 is directly driven by the crank-connecting rod mechanism and its own spring structure, but there is a phase angle with the piston movement in the hydraulic cylinder drive module 1. The plunger movement law is described by the following formula:

[0088]

[0089] Where: x zs is the displacement of the plunger pump plunger; r is the radius of the plunger-driven eccentric wheel; θ is the rotation angle of the plunger-driven eccentric wheel; a is the eccentricity of the plunger pump driven eccentric wheel; v zs is the speed of the plunger pump plunger;

[0090] The plunger-driven eccentric is described by its phase difference with the crankshaft rotation:

[0091]

[0092] Where: The phase difference between the rotation angle of the plunger-driven eccentric and the rotation angle of the crankshaft;

[0093] By converting the above mathematical formula into AMESim modular modeling simulation language, a plunger pump module 2 is formed, which is then connected to the hydraulic cylinder module 6.

[0094] The instantaneous flow of the relief valve module 3 is determined by the relief valve opening, the pressure difference on both sides of the relief valve and the medium properties. The flow of the direct-acting relief valve can be described by the following formula:

[0095]

[0096] Where: q oil is the instantaneous flow of the overflow valve; C df is the overflow valve inlet flow coefficient; D f is the inlet diameter of the relief valve;

[0097] Δx f is the valve core lift of the overflow valve; ρ is the density of the hydraulic oil; p oil is the oil pressure in the cavity; k s is the spring stiffness of the overflow valve; Δx spring is the compression amount of the overflow valve spring; p c is the pressure inside the overflow valve core; C db is the overflow valve outlet flow coefficient; D b is the outlet diameter of the relief valve;

[0098] Simplify the above mathematical formula and regard the overflow valve core pressure as atmospheric pressure, then:

[0099]

[0100] By converting the above mathematical formula into AMESim modular modeling simulation language, a relief valve module 3 is formed, which is then connected to the hydraulic cylinder module 6.

[0101] Furthermore, the movement of the valve cores in the intake valve module 4 and the exhaust valve module 5 is described by the following formula:

[0102]

[0103] Where: M ν H is the valve core mass; νc is the displacement of the intake valve core; H νd is the exhaust valve core displacement; κ ν is the flow coefficient; p gs is the pressure in the intake pipe; p g A is the pressure in the air chamber of the diaphragm compressor; ν K is the flow area of ​​the valve core;ν H is the valve core spring stiffness; ν0 is the spring pre-compression amount;

[0104] By converting the above mathematical formula into AMESim modular modeling simulation language, an intake valve module 4 and an exhaust valve module 5 are formed, and then connected with a pneumatic cylinder module 8.

[0105] By simulating the hydraulic oil entering from the plunger pump module 2 and being discharged from the overflow valve module 3, the liquid pressure is applied to the diaphragm of the diaphragm compressor in the hydraulic cylinder module 6 to drive the diaphragm movement in the diaphragm movement module 7, thereby realizing the establishment of the liquid phase flow process of the diaphragm compressor; by simulating the change of the gas volume in the pneumatic cylinder module 8 driven by the diaphragm movement module 7, thereby causing the change of the gas pressure in the pneumatic cylinder module 8 and the movement of the intake valve module 4 and the exhaust valve module 5, thereby realizing the establishment of the gas phase flow process of the diaphragm compressor; by simulating the liquid phase flow process of the diaphragm compressor through the diaphragm movement module 7 to drive the gas phase flow process, thereby realizing the establishment of the gas-liquid-solid coupling process of the diaphragm compressor.

[0106] The relationship between the maximum deflection of the diaphragm center of a single-index diaphragm compressor and the volume of the diaphragm cavity is described by the following formula:

[0107]

[0108] Where: V q is the half-cavity volume under the maximum center deflection of the diaphragm; R is the radius of the diaphragm cavity; W0 is the maximum center deflection of the diaphragm; z is the diaphragm cavity index coefficient; since the change in the diaphragm center deflection caused by the diaphragm movement is linearly related to the change in the diaphragm cavity volume, the reciprocating cylinder model is used to replace the movement of the diaphragm surface, and the above formula is converted into the AMESim modular modeling and simulation language to form a diaphragm motion module 7, which is connected to the hydraulic cylinder module 6 and the pneumatic cylinder module 8, thereby realizing the establishment of the gas-liquid-solid coupling dynamic model of the diaphragm compressor system based on AMESim.

[0109] Furthermore, according to the actual structure and operating parameters of the single-stage diaphragm compressor operating conditions, including intake pressure of 6.2MPa, exhaust pressure of 22.1MPa, rotation speed of 420rpm, membrane cavity diameter of 70mm, plunger pump plunger diameter of 20mm, plunger pump plunger stroke of 10mm, and crank radius of 200mm, the parameters of different modules were set and calculated according to the actual physical model parameters in the AMESim software.

[0110] like Figure 3As shown, through the above method and parameter settings, the movement of the center position of the diaphragm of the diaphragm compressor is simulated and calculated in the diaphragm motion module 7 simulated by AMESim. It can be seen that the diaphragm compressor diaphragm can reach the wall of the diaphragm compressor air cavity without hitting the set oil cavity wall, which belongs to the normal operating condition.

[0111] like Figure 4 As shown, through the above method and parameter settings, the simulation calculation in the pneumatic cylinder module 8 and the hydraulic cylinder module 6 simulated by AMESim obtains that the oil pressure and air pressure of the single-stage diaphragm compressor have the same change trend with the crank angle. During the working time when the overflow valve core is opened, the oil pressure in the diaphragm compressor cavity is higher than the air pressure, which is in line with the actual operation of the diaphragm compressor.

[0112] like Figures 5 and 6 As shown, through the above method and parameter setting, the opening and closing characteristics and flow characteristics of the plunger pump and the relief valve are simulated and calculated in the plunger pump module 2 and the relief valve module 3 simulated by AMESim. It can be seen that the plunger pump and the relief valve will only open when the pressure in the oil chamber is higher than the set valve core opening pressure.

[0113] In summary, through the analysis of the above-mentioned AMESim simulation calculation model, simulation method and simulation results, it is possible to study the oil pressure and air pressure following characteristics of single-stage diaphragm compressors, diaphragm movement and plunger pumps, and flow characteristics of overflow valves, so as to guide the development and research purpose of new models.

[0114] Example 2

[0115] Another embodiment of the present invention provides a two-stage diaphragm compressor system gas-liquid-solid coupling dynamics simulation model and simulation method based on AMESim, which is used for the simulation study of the two-stage oil pressure coupling change characteristics of the two-stage diaphragm compressor. Different from the above-mentioned embodiment 1, the simulation model described in this embodiment is for the two-stage diaphragm compressor, and the specific simulation requirement in its simulation method is the simulation study of the two-stage oil pressure coupling change characteristics. Its specific physical model is changed from a single-stage compressor to a two-stage diaphragm compressor, and its first-stage diaphragm compressor exhaust pressure is equal to the second-stage diaphragm compressor intake pressure. Its first-stage diaphragm compressor oil overflow model is the same as that of embodiment 1, using an overflow valve structure, while its second-stage diaphragm compressor oil overflow model uses a follower valve structure.

[0116] like Figure 7As shown, the diaphragm compressor integrated module in the gas-liquid-solid coupling dynamics simulation model of the two-stage diaphragm compressor system of the embodiment of the present invention includes a first-stage diaphragm compressor integrated module J1 and a second-stage diaphragm compressor integrated module J2; the first-stage diaphragm compressor integrated module J1 and the second-stage diaphragm compressor integrated module J2 are the overall component integration of two single-stage diaphragm compressors. Except for the different unit node parameter settings, the first-stage diaphragm compressor integrated module J1 adopts the overflow valve module 3, and the second-stage diaphragm compressor integrated module J2 adopts the follower valve module 9; the follower valve module 9 is described by the following formula:

[0117]

[0118] Where: q oil,ylvalve is the flow rate of the servo valve; C dv D is the flow coefficient of the oil outlet of the servo valve; f is the outlet diameter of the follow-up valve; p gas,d is the exhaust pressure in the first-stage diaphragm compressor integrated module J1;

[0119] The exhaust pressure in the first-stage diaphragm compressor integrated module J1 controls the opening and closing characteristics of the follower valve model in the second-stage diaphragm compressor integrated module J2 through the data transmission module J4, thereby realizing the overflow function of the follower valve model; the above formula is converted into the AMESim modular modeling and simulation language, connected to the second-stage diaphragm compressor integrated module J2, and cooperated with other modules to realize the establishment of the gas-liquid-solid coupling dynamic model of the diaphragm compressor system with follower valve based on AMESim;

[0120] The output data in the first-stage diaphragm compressor integrated module J1 and the second-stage diaphragm compressor integrated module J2 are analyzed and modulated, and finally output to the demand user end through the data acquisition module J3.

[0121] Furthermore, the first-stage intake pressure was set to 1.7MPa, the intermediate pressure to 6.3MPa, and the exhaust pressure to 22.1MPa, and the gas-liquid-solid coupling dynamics simulation calculation based on AMESim was performed on a two-stage diaphragm compressor product.

[0122] like Figure 8 As shown, through the above model and parameter settings, the two-stage oil pressure change characteristic curve of the two-stage diaphragm compressor is obtained by simulation calculation in the data output acquisition module J3 of AMESim simulation; Fig. 9 As shown in Figure 1, considering the compressibility of the hydraulic oil, both the primary and secondary diaphragms hit the cylinder wall, which is a normal operating condition; Fig.10 As shown, the first-stage plunger pump, the second-stage plunger pump, the first-stage overflow valve, and the second-stage overflow valve are opened in sequence, and the results are reasonable and meet the preset research requirements.

[0123] The gas-liquid-solid coupling dynamics simulation model and calculation method of the diaphragm compressor system based on AMESim of the present invention have good operability and reliability in the actual research and development design process, and can guide the design and development work of diaphragm compressor practitioners.

[0124] Another embodiment of the present invention further provides a diaphragm compressor system gas-liquid-solid coupling dynamics simulation system, comprising:

[0125] Demand summarization module, used to summarize different diaphragm compressor physical models in specific application scenarios based on actual needs;

[0126] Physical model partitioning module, used to modularize the gas circuit system, oil circuit system, diaphragm movement, auxiliary components and other heat and mass transfer components of the diaphragm compressor physical model;

[0127] AMESim simulation calculation module is used to write and set parameters based on the physical model of the diaphragm compressor after modular partitioning through the AMESim language of the advanced modeling and simulation platform for engineering systems, and realize the simulation calculation of the diaphragm compressor in AMESim;

[0128] The physical model optimization and adjustment module is used to verify the simulation calculation results of AMESim. Through comparative analysis, the parameters of the diaphragm compressor physical model are optimized and adjusted to make the diaphragm compressor physical model meet the actual operating conditions.

[0129] The physical model selection and design module is used to use the physical model of the diaphragm compressor that meets the actual operating conditions, solve related problems according to simulation requirements, and optimize the selection and design of the diaphragm compressor system or structure.

[0130] An embodiment of the present invention further provides an electronic device, characterized in that it includes:

[0131] A memory storing at least one instruction; and a processor executing the instruction stored in the memory to implement the gas-liquid-solid coupling dynamics simulation method of the diaphragm compressor system.

[0132] An embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the gas-liquid-solid coupling dynamics simulation method of the diaphragm compressor system is implemented.

[0133] 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 gas-liquid-solid coupled dynamic simulation method of the diaphragm compressor system of the present invention. The one or more modules / units may be a series of computer-readable instruction segments capable of completing specific functions, which are used to describe the execution process of the computer program in the server.

[0134] 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.

[0135] 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.

[0136] 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.

[0137] 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.

[0138] 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.

[0139] 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.

[0140] 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.

[0141] 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 gas-liquid-solid coupling dynamics simulation method for a diaphragm compressor system, characterized in that: include: Summarize different diaphragm compressor physical models in specific application scenarios based on actual needs; Modular partitioning of the diaphragm compressor physical model into gas circuit system, oil circuit system, diaphragm movement, auxiliary components and other heat and mass transfer components; According to the physical model of the diaphragm compressor after modular partitioning, the advanced modeling and simulation platform for engineering systems AMESim language is used for writing and parameter setting, and the simulation calculation of the diaphragm compressor is realized in AMESim; Verify the simulation calculation results of AMESim, and optimize and adjust the parameters of the diaphragm compressor physical model through comparative analysis to make the diaphragm compressor physical model meet the actual operating conditions; Use a physical model of the diaphragm compressor that meets actual operating conditions to solve related problems based on simulation requirements and optimize the selection and design of the diaphragm compressor system or structure.

2. The gas-liquid-solid coupling dynamics simulation method of a diaphragm compressor system according to claim 1 is characterized in that: When summarizing different diaphragm compressor physical models in specific application scenarios through actual needs, the actual needs include component selection optimization design, compressor fault diagnosis, system simulation and optimization, performance prediction and verification, and research and development of new ultra-high pressure models.

3. The gas-liquid-solid coupling dynamics simulation method of a diaphragm compressor system according to claim 1, characterized in that: The diaphragm compressor physical model comprises a diaphragm compressor integrated module composed of a hydraulic cylinder drive module (1), a plunger pump module (2), a relief valve module (3), an intake valve module (4), an exhaust valve module (5), a hydraulic cylinder module (6), a diaphragm movement module (7), a pneumatic cylinder module (8) and a follower valve module (9), as well as a data acquisition module (J3) and a data transmission module (J4); The hydraulic cylinder driving module (1) is used to simulate the process of the diaphragm compressor simulating the crank connecting rod mechanism driving the piston movement; The plunger pump module (2) and the relief valve module (3) are used to simulate the oil inlet and oil outlet processes of the diaphragm compressor cylinder respectively; The hydraulic cylinder module (6) is used to simulate the process of effective volume movement of the hydraulic oil in the diaphragm compressor cylinder.

4. The gas-liquid-solid coupling dynamics simulation method of a diaphragm compressor system according to claim 3 is characterized in that: The physical model of the diaphragm compressor after modular partitioning is written and parameterized using the AMESim language of the advanced modeling and simulation platform for engineering systems. When the simulation calculation of the diaphragm compressor is realized in AMESim, the piston movement in the hydraulic cylinder drive module (1) is directly driven by the crank-connecting rod mechanism, and the movement law of the piston is described by the following formula: Where: x is the piston displacement; φ is the crankshaft angle; r is the crankshaft radius; λ is the ratio of the crankshaft radius r to the connecting rod length l; v is the piston speed; ω is the angular velocity; By converting the above mathematical formula into AMESim modular modeling simulation language, a hydraulic cylinder drive module (1) is formed, which is then connected to a hydraulic cylinder module (6).

5. The gas-liquid-solid coupling dynamics simulation method of a diaphragm compressor system according to claim 4, characterized in that: The plunger movement of the plunger pump module (2) is directly driven by the crank-connecting rod mechanism and its own spring structure, but there is a phase angle with the piston movement in the hydraulic cylinder drive module (1). The plunger movement law is described by the following formula: Where: x zs is the displacement of the plunger pump plunger; r is the radius of the plunger-driven eccentric wheel; θ is the rotation angle of the eccentric wheel driven by the plunger; a is the eccentricity of the eccentric wheel driving the plunger pump; v zs is the speed of the plunger pump plunger; The plunger-driven eccentric is described by its phase difference with the crankshaft rotation: Where: The phase difference between the rotation angle of the plunger-driven eccentric and the rotation angle of the crankshaft; By converting the above mathematical formula into AMESim modular modeling simulation language, a plunger pump module (2) is formed, which is then connected to a hydraulic cylinder module (6).

6. The gas-liquid-solid coupling dynamics simulation method of a diaphragm compressor system according to claim 5, characterized in that: The instantaneous flow rate of the overflow valve module (3) is determined by the overflow valve opening, the pressure difference on both sides of the overflow valve and the medium properties, and is described by the following formula: Where: q oil is the instantaneous flow of the overflow valve; C df is the overflow valve inlet flow coefficient; D f is the inlet diameter of the overflow valve; Δx f is the valve core lift of the overflow valve; ρ is the density of the hydraulic oil; p oil is the oil pressure in the cavity; k s is the spring stiffness of the overflow valve; Δx spring is the compression amount of the overflow valve spring; p c is the pressure inside the overflow valve core; C db is the overflow valve outlet flow coefficient; D b is the outlet diameter of the relief valve; Simplify the above mathematical formula and regard the overflow valve core pressure as atmospheric pressure, then: By converting the above mathematical formula into AMESim modular modeling simulation language, a relief valve module (3) is formed, which is then connected to a hydraulic cylinder module (6).

7. The gas-liquid-solid coupling dynamics simulation method of a diaphragm compressor system according to claim 6, characterized in that: The air intake valve module (4) and the air exhaust valve module (5) are used to simulate the air intake and exhaust processes of the air cavity volume of the diaphragm compressor, respectively, and the pneumatic cylinder module (8) is used to simulate the gas compression process caused by the change of the air cavity volume of the diaphragm compressor; The movement of the valve cores in the intake valve module (4) and the exhaust valve module (5) is described by the following equation: Where: M v H is the valve core mass; vc is the displacement of the intake valve core; H vd is the displacement of the exhaust valve core; κ v is the flow coefficient; p gs is the pressure in the intake pipe; p g A is the pressure in the air chamber of the diaphragm compressor; v K is the flow area of ​​the valve core; ν H is the valve core spring stiffness; ν0 is the spring pre-compression amount; By converting the above mathematical formula into AMESim modular modeling simulation language, an intake valve module (4) and an exhaust valve module (5) are formed, and then connected with a pneumatic cylinder module (8).

8. The gas-liquid-solid coupling dynamics simulation method of a diaphragm compressor system according to claim 7, characterized in that: By simulating the hydraulic oil entering from the plunger pump module (2) and being discharged from the overflow valve module (3), the hydraulic pressure is applied to the diaphragm of the diaphragm compressor in the hydraulic cylinder module (6), driving the diaphragm in the diaphragm movement module (7) to move, thereby realizing the establishment of the liquid phase flow process of the diaphragm compressor; by simulating the change of the gas volume in the pneumatic cylinder module (8) driven by the diaphragm movement module (7), thereby causing the gas pressure in the pneumatic cylinder module (8) to change and the movement of the intake valve module (4) and the exhaust valve module (5), thereby realizing the establishment of the gas phase flow process of the diaphragm compressor; by simulating the liquid phase flow process of the diaphragm compressor through the diaphragm movement module (7) to drive the gas phase flow process, thereby realizing the establishment of the gas-liquid-solid coupling process of the diaphragm compressor; The relationship between the maximum deflection of the diaphragm center of a single-index diaphragm compressor and the volume of the diaphragm cavity is described by the following formula: Where: V q is the half-cavity volume under the maximum center deflection of the diaphragm; R is the radius of the diaphragm cavity; W0 is the maximum center deflection of the diaphragm; z is the diaphragm cavity index coefficient; since the change in the diaphragm center deflection caused by the diaphragm movement is linearly related to the change in the diaphragm cavity volume, the reciprocating cylinder model is used to replace the movement of the diaphragm surface, and the above formula is converted into the AMESim modular modeling and simulation language to form a diaphragm movement module (7), which is connected to the hydraulic cylinder module (6) and the pneumatic cylinder module (8), thereby realizing the establishment of the gas-liquid-solid coupling dynamic model of the diaphragm compressor system based on AMESim.

9. The gas-liquid-solid coupling dynamics simulation method of a diaphragm compressor system according to claim 8, characterized in that: The diaphragm compressor integrated module comprises a first-stage diaphragm compressor integrated module (J1) and a second-stage diaphragm compressor integrated module (J2); the first-stage diaphragm compressor integrated module (J1) and the second-stage diaphragm compressor integrated module (J2) are the overall component integration of two single-stage diaphragm compressors, and except for the different unit node parameter settings, the first-stage diaphragm compressor integrated module (J1) adopts a relief valve module (3), and the second-stage diaphragm compressor integrated module (J2) adopts a follower valve module (9); The follow-up valve module (9) is described by the following formula: Where: q oil,ylvalve is the flow rate of the servo valve; C dv D is the flow coefficient of the oil outlet of the servo valve; f is the outlet diameter of the follow-up valve; p gas,d is the exhaust pressure in the first-stage diaphragm compressor integrated module (J1); The exhaust pressure in the first-stage diaphragm compressor integrated module (J1) controls the opening and closing characteristics of the follower valve model in the second-stage diaphragm compressor integrated module (J2) through the data transmission module (J4), thereby realizing the overflow function of the follower valve model; the above formula is converted into the AMESim modular modeling and simulation language, connected to the second-stage diaphragm compressor integrated module (J2), and cooperated with other modules to realize the establishment of the gas-liquid-solid coupling dynamic model of the diaphragm compressor system with follower valve based on AMESim; The output data in the first-stage diaphragm compressor integrated module (J1) and the second-stage diaphragm compressor integrated module (J2) are analyzed and modulated, and finally output to the demand user end through the data acquisition module (J3).

10. A gas-liquid-solid coupling dynamics simulation system for a diaphragm compressor system, characterized in that: include: Demand summarization module, used to summarize different diaphragm compressor physical models in specific application scenarios based on actual needs; Physical model partitioning module, used to modularize the gas circuit system, oil circuit system, diaphragm movement, auxiliary components and other heat and mass transfer components of the diaphragm compressor physical model; AMESim simulation calculation module is used to write and set parameters based on the physical model of the diaphragm compressor after modular partitioning through the AMESim language of the advanced modeling and simulation platform for engineering systems, and realize the simulation calculation of the diaphragm compressor in AMESim; The physical model optimization and adjustment module is used to verify the simulation calculation results of AMESim. Through comparative analysis, the parameters of the diaphragm compressor physical model are optimized and adjusted to make the diaphragm compressor physical model meet the actual operating conditions. The physical model selection and design module is used to use the physical model of the diaphragm compressor that meets the actual operating conditions, solve related problems according to simulation requirements, and optimize the selection and design of the diaphragm compressor system or structure.

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