A reciprocating compressor valve simulation calculation system

Abstract

The present invention discloses a reciprocating compressor valve simulation calculation system, including an MDI main window, the MDI main window including a valve calculation sub-window, a database module and a configuration file module, the valve calculation sub-window is used to provide the entire software valve calculation core function, the database module provides the basic data used in the valve calculation process, the configuration file module is used to load and save the configuration data of the program, the valve calculation sub-window includes a core iteration algorithm module, and the core iteration algorithm module is used to provide the core algorithm of the valve calculation. The present invention provides a large amount of basic data and algorithms, and the intermediate data can be automatically calculated, thereby eliminating the complicated calculation work of the staff, so as to facilitate the simulation of the valve working process and design a new valve.

Description

Technical Field

[0001] The invention relates to the field of compressor valves, and in particular to a reciprocating compressor valve simulation calculation system. Background Art

[0002] For a long time, the design of domestic reciprocating compressor valves has been based on accumulated experience. The design of valves requires reference to various data and computer software simulation.

[0003] However, the existing computer simulation aided design has a large amount of calculation, and the input and output parameter human-machine interface is not friendly. Most of them require the input of intermediate data that must be calculated, such as valve seat flow area, valve gap flow area, working volume, valve opening angle, etc. This brings certain difficulties to the use of junior designers. In addition, this type of software is generally used in simulation and recalculation inspection, and has not been applied to the design of valves. Therefore, a reciprocating compressor valve simulation calculation system is needed to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a reciprocating compressor valve simulation calculation system to reduce the calculation workload of the staff and facilitate the design of new valves.

[0005] In order to solve the above technical problems, the present invention provides a reciprocating compressor valve simulation calculation system, including an MDI main window, the MDI main window includes a valve calculation sub-window, a database module and a configuration file module, the valve calculation sub-window is used to provide the core function of the entire software valve calculation, the database module provides a large amount of basic data used in the valve calculation process, the configuration file module is used to load and save various configuration data of the program, the valve calculation sub-window includes a core iterative algorithm module, and the core iterative algorithm module is used to provide the core algorithm of the valve calculation.

[0006] Furthermore, the MDI main window also includes a log module, which provides the entire software with a record of program running behavior.

[0007] Furthermore, an archive module is provided on the gas valve calculation sub-window, and the archive module is used to read and save archive files.

[0008] Furthermore, the gas valve calculation sub-window also includes a chart drawing module and a verification calculation module. The chart drawing module is used to receive the iterative data output by the core iterative algorithm module, and to make a chart of the iterative data and display it on the gas valve calculation sub-window. The verification calculation module is used to verify the data output by the core iterative algorithm module.

[0009] Furthermore, the core iterative algorithm module includes an operating condition parameter sub-function module, a gas calculation sub-function module, a structure calculation sub-function module, a spring calculation sub-function module and a stepless adjustment calculation sub-function module.

[0010] Furthermore, the structural calculation sub-functional module includes a valve seat calculation unit, a valve clearance calculation unit, an elastic arm calculation unit and a limiter calculation unit. The valve seat calculation unit is used to calculate the valve seat flow area and the exhaust valve clearance volume, the valve clearance calculation unit is used to calculate the valve plate sealing circumference and the mass of the valve plate and the buffer plate, the elastic arm calculation unit is used to calculate the elastic arm stiffness and mass, and the limiter calculation unit is used to calculate the intake valve clearance volume.

[0011] Furthermore, the calculation formulas of the core iterative algorithm are as follows:

[0012] The calculation formula of the intake valve motion law equation group is:

[0013]

[0014] The calculation formula of the exhaust valve motion equation group is:

[0015]

[0016] Where h is the displacement of the valve plate, θ is the crank angle, ω is the crank angular velocity, and M v represents the mass of the moving parts of the valve disc, β represents the thrust coefficient, α v Indicates the valve flow coefficient, a v Indicates the valve gap flow area, a p represents the flow area of ​​the valve seat outlet, Z represents the number of valve springs, K represents the valve spring stiffness, H0 represents the pre-compression of the valve spring, k represents the adiabatic index of the compressed medium, R represents the gas constant of the compressed medium, and p s Indicates the intake pressure, p d Indicates the exhaust pressure, T s Indicates the intake air temperature, T d Indicates the exhaust temperature, It represents the pressure ratio between the inside and outside of the intake valve cavity, ψ represents the pressure ratio between the inside and outside of the exhaust valve cavity, and V represents the cylinder working volume.

[0017] Furthermore, the calculation formulas for the cover side working volume and the shaft side working volume are as follows:

[0018] The calculation formula of cover side working volume is:

[0019]

[0020] The calculation formula of shaft side working volume is:

[0021]

[0022] Where V h represents the piston stroke volume, and ε represents the relative clearance volume.

[0023] Compared with the prior art, the present invention has at least the following beneficial effects:

[0024] The present invention is provided with a valve calculation subwindow to automatically calculate intermediate data, and is also provided with a database module to provide a large amount of basic data, thereby eliminating the complicated calculation work of the staff, thereby facilitating the simulation of the valve working process and designing a new valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the reciprocating compressor valve simulation calculation system of the present invention;

[0026] Figure 2 The present invention is a flowchart of the internal algorithm of the core iterative algorithm module in the reciprocating compressor valve simulation calculation system. DETAILED DESCRIPTION

[0027] The reciprocating compressor valve simulation computing system of the present invention will be described in more detail below in conjunction with a schematic diagram, wherein a preferred embodiment of the present invention is shown, and it should be understood that those skilled in the art may modify the present invention described herein while still achieving the advantageous effects of the present invention. Therefore, the following description should be understood as being widely known to those skilled in the art and not as a limitation of the present invention.

[0028] The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description and claims. It should be noted that the drawings are in very simplified form and in non-precise proportions, and are only used to facilitate and clearly assist in illustrating the purpose of the embodiments of the present invention.

[0029] like Figure 1 As shown, an embodiment of the present invention proposes a reciprocating compressor valve simulation calculation system, including an MDI main window, wherein the MDI main window includes a valve calculation sub-window, a database module and a configuration file module.

[0030] The valve calculation sub-window is used to provide the valve calculation core function of the entire software.

[0031] The database module provides a large amount of basic data used in the valve calculation process, such as standard spring size data, physical properties of common gases, mechanical properties of common materials, etc.

[0032] The configuration file module is used to load and save various configuration data of the program (which can be modified according to the usage environment and personnel).

[0033] The gas valve calculation sub-window includes a core iterative algorithm module, and the core iterative algorithm module is used to provide a core algorithm for gas valve calculation.

[0034] The core of the core iterative algorithm module is to use each intermediate data as input parameters, use the fourth-order Runge-Kutta method to solve the third-order ordinary differential equations, and output the three key parameters of valve displacement, valve speed, and valve cavity internal and external pressure ratio at each step of the compressor crank angle within 360 degrees. Then, through several post-processing steps, various thermodynamic and kinetic data of the valve are calculated for designers to view.

[0035] Specifically, the Runge-Kutta method is a high-precision single-step algorithm widely used in engineering. This is a prior art and will not be described in detail here.

[0036] Preferably, the MDI main window also includes a log module, which provides the entire software with a record of program running behavior, thereby facilitating later debugging and locating program fault points and analyzing them.

[0037] Furthermore, the valve calculation sub-window is provided with an archive module, which is used to read and save archive files. Specifically, it includes a function of processing the archive of the current version and a function of processing the archive of the old version of the software. This enables the software to be compatible with both the old and new versions of the archive, reducing the cost of users migrating to the new version of the software.

[0038] Wherein, the gas valve calculation sub-window also includes a chart drawing module and a verification calculation module.

[0039] The chart drawing module is used for receiving the iterative data output by the core iterative algorithm module, and making a chart of the iterative data to be displayed on the gas valve calculation sub-window, so as to facilitate the staff to view and review.

[0040] The verification calculation module is used to verify the data output by the core iterative algorithm module and determine whether the result data meets the design standards. If not, the design needs to be adjusted.

[0041] Specifically, the core iterative algorithm module includes an operating condition parameter sub-function module, a gas calculation sub-function module, a structure calculation sub-function module, a spring calculation sub-function module and a stepless adjustment calculation sub-function module.

[0042] The operating parameter sub-function module is used to receive the initial design parameters of the gas valve input by the user, perform simple calculations, and output intermediate data for use by the core iterative algorithm.

[0043] The gas calculation sub-function module is used to receive various physical properties of the compressed mixed gas input by the user, perform simple calculations, and output gas data for use by the core iterative algorithm.

[0044] The structure calculation sub-function module is used to calculate the valve structure data.

[0045] The spring calculation sub-function module is used to receive spring data defined or selected by the user and output spring calculation results for use by the core iterative algorithm.

[0046] The stepless adjustment calculation sub-function module is used to receive the stepless adjustment parameters input by the user and output the stepless adjustment intermediate data for use by the core iterative algorithm.

[0047] In order to explain the specific process of calculating and judging the intermediate data, please refer to Figure 2 First, input the working parameters, gas parameters, estimate and input the spring data, input the structural data according to the selected valve structure and input the stepless adjustment parameters; then integrate the above parameters and perform the drawing calculation function in the software; then determine whether the various thermodynamic and kinetic results calculated meet the factory standards; if they meet, the design can be ended; if not, the above parameters need to be appropriately adjusted until they meet the factory standards.

[0048] Furthermore, the structure calculation sub-functional module includes a valve seat calculation unit, a valve gap calculation unit, an elastic arm calculation unit and a limiter calculation unit.

[0049] The valve seat calculation unit is used to calculate the valve seat flow area and the exhaust valve clearance volume, the valve clearance calculation unit is used to calculate the valve plate sealing circumference and the mass of the valve plate and the buffer plate, the elastic arm calculation unit is used to calculate the elastic arm stiffness and mass, and the limiter calculation unit is used to calculate the intake valve clearance volume.

[0050] Furthermore, the calculation formulas of the core iterative algorithm are as follows.

[0051] The calculation formula of the intake valve motion law equation group is:

[0052]

[0053] The calculation formula of the exhaust valve motion law equation group is:

[0054]

[0055] Where h is the displacement of the valve plate, θ is the crank angle, ω is the crank angular velocity, and M v represents the mass of the moving parts of the valve disc, β represents the thrust coefficient, α vIndicates the valve flow coefficient, a v Indicates the valve gap flow area, a p represents the flow area of ​​the valve seat outlet, Z represents the number of valve springs, K represents the valve spring stiffness, H0 represents the pre-compression of the valve spring, k represents the adiabatic index of the compressed medium, R represents the gas constant of the compressed medium, and p s Indicates the intake pressure, p d Indicates the exhaust pressure, T s Indicates the intake air temperature, T d Indicates the exhaust temperature, It represents the pressure ratio between the inside and outside of the intake valve cavity, ψ represents the pressure ratio between the inside and outside of the exhaust valve cavity, and V represents the cylinder working volume.

[0056] Furthermore, the calculation formulas for the cover side working volume and the shaft side working volume are as follows:

[0057] The calculation formula of cover side working volume is:

[0058]

[0059] The calculation formula of shaft side working volume is:

[0060]

[0061] Where V h represents the piston stroke volume, and ε represents the relative clearance volume.

[0062] To summarize, the present invention only needs to input working parameters, gas parameters, estimate and input spring data, input structural data according to the selected valve structure and input stepless adjustment parameters, and then use internal calculation formulas and a fixed-step fourth-order Runge-Kutta method to perform calculations to determine whether various thermodynamic and kinetic structures meet factory standards. If they do not meet the standards, corresponding adjustments need to be made. There is no need for staff to perform large calculations, so it is more friendly to junior designers and is convenient for simulating the valve working process and designing new valves.

[0063] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A reciprocating compressor valve simulation calculation system, characterized in that: It includes an MDI main window, wherein the MDI main window includes a gas valve calculation sub-window, a database module and a configuration file module; The gas valve calculation sub-window is used to provide the core function of the gas valve calculation of the entire software; The database module provides basic data used in the gas valve calculation process; The configuration file module is used to load and save the configuration data of the program; The valve calculation sub-window includes a core iterative algorithm module, and the core iterative algorithm module is used to provide a core algorithm for valve calculation, and the core algorithm includes an intake valve motion law equation group and an exhaust valve motion law equation group; The calculation formula of the intake valve motion law equation group is: The calculation formula of the exhaust valve motion law equation group is: Where h is the displacement of the valve plate, θ is the crank angle, ω is the crank angular velocity, and M v represents the mass of the moving parts of the valve disc, β represents the thrust coefficient, α v Indicates the valve flow coefficient, a v Indicates the valve gap flow area, a p represents the flow area of ​​the valve seat outlet, Z represents the number of valve springs, K represents the valve spring stiffness, H0 represents the pre-compression of the valve spring, k represents the adiabatic index of the compressed medium, R represents the gas constant of the compressed medium, and p s Indicates the intake pressure, p d Indicates the exhaust pressure, T s Indicates the intake air temperature, T d Indicates the exhaust temperature, It represents the pressure ratio between the inside and outside of the intake valve cavity, ψ represents the pressure ratio between the inside and outside of the exhaust valve cavity, and V represents the cylinder working volume.

2. The reciprocating compressor valve simulation calculation system according to claim 1, characterized in that: The MDI main window also includes a log module, which provides the entire software with a record of program running behavior.

3. The reciprocating compressor valve simulation calculation system according to claim 1, characterized in that: The gas valve calculation sub-window is provided with an archive module, and the archive module is used to read and save archive files.

4. The reciprocating compressor valve simulation calculation system according to claim 1, characterized in that: The valve calculation sub-window also includes a chart drawing module and a verification calculation module. The chart drawing module is used to receive the iterative data output by the core iterative algorithm module, and to make a chart of the iterative data and display it on the valve calculation sub-window. The verification calculation module is used to verify the data output by the core iterative algorithm module.

5. The reciprocating compressor valve simulation calculation system according to claim 1, characterized in that: The core iterative algorithm module includes an operating condition parameter sub-function module, a gas calculation sub-function module, a structure calculation sub-function module, a spring calculation sub-function module and a stepless adjustment calculation sub-function module.

6. The reciprocating compressor valve simulation calculation system according to claim 5, characterized in that: The structural calculation sub-functional module includes a valve seat calculation unit, a valve clearance calculation unit, an elastic arm calculation unit and a limiter calculation unit. The valve seat calculation unit is used to calculate the valve seat flow area and the exhaust valve clearance volume, the valve clearance calculation unit is used to calculate the valve plate sealing circumference and the valve plate and buffer plate mass, the elastic arm calculation unit is used to calculate the elastic arm stiffness and mass, and the limiter calculation unit is used to calculate the intake valve clearance volume.

7. The reciprocating compressor valve simulation calculation system according to claim 1, characterized in that: The cylinder working volume includes the cover side working volume and the shaft side working volume, and the calculation formulas are as follows: The calculation formula of cover side working volume is: The calculation formula of shaft side working volume is: Where V h represents the piston stroke volume, and ε represents the relative clearance volume.

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