Fluid pressure control system based on pressure reducing valve

Abstract

The invention relates to the technical field of fluid pressure executing mechanisms, in particular to a fluid pressure control system based on a pressure reducing valve. By arranging the data verification module, whether operation of the fluid pressure control system meets the standard or not can be rapidly judged based on the coincidence degree of the obtained fluid flow curve within the preset period duration and the preset fluid flow curve datum, and the operation accuracy of the fluid pressure control system of the pressure reducing valve is improved; by re-determining the preset period duration reference and the fluid flow curve reference, the operation accuracy of the fluid pressure control system of the pressure reducing valve is improved; according to the invention, when the reason for determining that the operation of the fluid pressure control system does not conform to the standard is the problem of the spring in the pressure reducing valve twice, the adjustment of the spring of the pressure reducing valve to the corresponding value is determined again, so that the operation accuracy of the fluid pressure control system of the pressure reducing valve is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fluid pressure actuator, and particularly relates to a fluid pressure control system based on a pressure reducing valve. BACKGROUND

[0002] As a fluid control device, the pressure reducing valve plays an irreplaceable role in the fields of petroleum, chemical industry, electric power and military. According to the feedback signal of the control unit, the pressure reducing valve adjusts the opening of the valve through electric, hydraulic, pneumatic and electric-hydraulic linkage actuators, changes the throttling area, and thus controls the process parameters such as pressure, temperature and flow rate to meet the different needs of users. Therefore, it is increasingly important to improve the efficiency and accuracy of the fluid pressure control system of the pressure reducing valve.

[0003] Chinese patent publication CN: 114754037A discloses a fluid pressure device valve that can easily separate the use of locking specifications and non-locking specifications. However, it does not address the problem of improving the efficiency and accuracy of the fluid pressure control system. SUMMARY

[0004] To this end, the present application provides a fluid pressure control system based on a pressure reducing valve to overcome the problem of low operation accuracy of the fluid pressure control system based on the pressure reducing valve in the prior art.

[0005] To achieve the above-mentioned purpose, the present application provides a fluid pressure control system based on a pressure reducing valve, comprising:

[0006] A pressure control module connected to the pressure reducing valve, used to detect the inlet pressure and outlet pressure of the pressure reducing valve, and the pressure control module is also used to draw a fluid flow curve within a preset period of time based on the detected flow rate of the through hole of the pressure reducing valve and the flow rate of the outlet inner diameter of the pressure reducing valve;

[0007] A parameter detection module connected to the pressure control module, used to obtain the running time, inlet pressure, outlet pressure and fluid flow curve of the pressure reducing valve detected by the pressure control module;

[0008] a data checking module connected with the pressure control module, configured to determine whether the fluid pressure control system is running in accordance with the standard based on the coincidence degree between the fluid flow curve obtained by the pressure control module within the preset period and the preset fluid flow curve reference, and determine the reason why the fluid pressure control system is running out of the standard based on the coincidence degree between the fluid flow curve obtained by the pressure control module within the preset period and the preset fluid flow curve reference in the case that the fluid pressure control system is determined to be running out of the standard; the data checking module is further configured to re-determine the preset period reference based on the difference between the obtained coincidence degree and the preset second reference, or re-determine the fluid flow curve reference based on the ratio between the difference between the obtained inlet pressure and outlet pressure and the preset reference.

[0009] Further, the calculation formula of the preset fluid flow curve reference is,

[0010] Q1=A1×0.33×P1×Y;

[0011] Q2=A2×0.11×P2;

[0012] wherein Q1 is the flow of the through hole of the pressure reducing valve, unit Nm 3 / hour; Q2 is the flow of the inner diameter of the outlet of the pressure reducing valve, unit Nm 3 / hour; P1 is the inlet pressure, unit bar abs (absolute pressure); P2 is the outlet pressure, unit bar abs (absolute pressure); A1 is the area of the valve hole of the pressure reducing valve, unit mm 2 ; A2 is the area of the inner diameter of the outlet of the pressure reducing valve, unit mm 2 ; Y is a constant coefficient.

[0013] Further, the data checking module is configured to determine the reason why the fluid pressure control system is running out of the standard based on the difference between the preset first reference and the obtained coincidence degree in the case that the fluid pressure control system is determined to be running out of the standard based on the coincidence degree between the fluid flow curve obtained by the pressure control module within the preset period and the preset fluid flow curve reference; and determine whether the fluid pressure control system is running in accordance with the standard based on the difference between the obtained inlet pressure and outlet pressure in the case that the fluid pressure control system is preliminarily determined to be running out of the standard.

[0014] Further, the data checking module is further configured to determine the reason why the fluid pressure control system is running out of the standard based on the difference between the preset first reference and the obtained coincidence degree, wherein:

[0015] the data checking module re-determines the preset period reference based on the difference between the obtained coincidence degree and the preset second reference in the case that the reason why the fluid pressure control system is running out of the standard is determined to be the problem of the preset period reference.

[0016] The data verification module re-determines the fluid flow curve reference based on the ratio of the obtained difference between the inlet pressure and the outlet pressure and the preset reference in case that the fluid pressure control system operation does not meet the standard due to the preset fluid flow curve reference problem.

[0017] The data verification module replaces the pressure reducing valve in case that the fluid pressure control system operation does not meet the standard due to the pressure reducing valve itself problem.

[0018] Further, the data verification module re-determines the adjustment mode for the pressure reducing valve spring in case that the fluid pressure control system operation does not meet the standard due to the pressure reducing valve spring problem based on the obtained difference between the inlet pressure and the outlet pressure.

[0019] Further, the data verification module provides several adjustment modes for the pressure reducing valve spring based on the ratio of the obtained difference between the inlet pressure and the outlet pressure and the preset reference, and each adjustment mode has different adjustment range for the pressure reducing valve spring.

[0020] Further, the data verification module provides several correction modes for the preset period length based on the obtained coincidence degree and the preset second reference, and each correction mode has different correction range for the preset period length.

[0021] Further, the data verification module provides several correction modes for the fluid flow curve reference based on the ratio of the obtained difference between the inlet pressure and the outlet pressure and the preset reference, and each correction mode has different correction range for the fluid flow curve reference.

[0022] Further, the data verification module sets the correction coefficient Y = 1 in the preset fluid flow curve reference in case that the inlet pressure P1 detected by the pressure control module is greater than 2 times the outlet pressure P2.

[0023] Further, the data verification module stores the standard-compliant fluid pressure control system reference data to the cloud.

[0024] Compared with the prior art, the present application has the beneficial effects that, by being provided with a data verification module, the present application can quickly determine whether the fluid pressure control system operation meets the standard based on the coincidence degree of the obtained fluid flow curve in the preset period of time with the preset fluid flow curve reference, thereby improving the accuracy of the fluid pressure control system operation of the pressure reducing valve, and, in the case that the fluid pressure control system operation is determined not to meet the standard, the cause of the fluid pressure control system operation not meeting the standard can be effectively determined based on the difference between the preset first reference and the coincidence, thereby avoiding the occurrence of misjudgment, improving the efficiency of the fluid pressure control system operation of the pressure reducing valve, and the preset period of time reference can be accurately determined based on the difference between the obtained coincidence degree and the preset second reference, thereby improving the accuracy of the fluid pressure control system operation of the pressure reducing valve; the fluid flow curve reference can be accurately determined based on the ratio of the difference between the obtained inlet pressure and outlet pressure and the preset reference, thereby improving the accuracy of the fluid pressure control system operation of the pressure reducing valve, and, in the case that the fluid pressure control system operation not meeting the standard is determined to be caused by the problem of the spring in the pressure reducing valve, the adjustment mode for the spring of the pressure reducing valve can be re-determined, thereby further improving the accuracy of the fluid pressure control system operation of the pressure reducing valve.

[0025] Further, the present application can effectively improve the accuracy of the fluid pressure control system operation of the pressure reducing valve through the calculation of the preset fluid flow curve reference.

[0026] Further, the present application can quickly determine whether the fluid pressure control system operation meets the standard based on the coincidence degree of the obtained fluid flow curve in the preset period of time with the preset fluid flow curve reference, thereby avoiding the occurrence of misjudgment and improving the efficiency of the fluid pressure control system operation of the pressure reducing valve.

[0027] Further, the present application can effectively re-determine the preset period of time reference by determining the cause of the fluid pressure control system operation not meeting the standard, thereby improving the efficiency and accuracy of the fluid pressure control system operation, and further improving the accuracy of the fluid pressure control system operation by re-determining the fluid flow curve reference to avoid the occurrence of misjudgment.

[0028] Further, the present application can further improve the accuracy of the fluid pressure control system operation of the pressure reducing valve by re-determining whether the fluid pressure control system operation meets the standard based on the difference between the obtained inlet pressure and outlet pressure.

[0029] Further, the present application can effectively ensure the efficiency and accuracy of the fluid pressure control system operation by adjusting the spring of the pressure reducing valve.

[0030] Further, the present application can further ensure the accuracy and stability of the fluid pressure control system of the pressure reducing valve by the correction of the preset period length reference and the fluid flow curve reference. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 a structural block diagram of the fluid pressure control system of the present application based on a pressure reducing valve;

[0032] Figure 2 a flow chart for determining whether the operation of the fluid pressure control system of the present application meets the standard;

[0033] Figure 3 a flow chart for determining the reason why the operation of the fluid pressure control system of the present application does not meet the standard;

[0034] Figure 4 a flow chart for the secondary determination of whether the operation of the fluid pressure control system of the present application meets the standard; DETAILED DESCRIPTION

[0035] In order to make the objects and advantages of the present application clearer, the present application will be further described in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0036] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that the embodiments are only used to explain the technical principles of the present application and are not used to limit the protection scope of the present application.

[0037] It should be noted that in the description of the present application, unless otherwise explicitly specified and limited, the terms “mounting”, “connection” and “linking” should be understood in a broad sense, for example, it can be fixed connection, detachable connection or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediate medium; it can be the communication inside two elements. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0038] Please refer to Figure 1 shown, which is a structural block diagram of the fluid pressure control system of the present application based on a pressure reducing valve; the fluid pressure control system based on a pressure reducing valve comprises:

[0039] a pressure control module connected with the pressure reducing valve, used to detect and record the inlet pressure and outlet pressure of the pressure reducing valve, and the pressure control module is also used to draw a fluid flow curve in a preset period length based on the obtained fluid flow in the pressure reducing valve;

[0040] a parameter detection module connected with the pressure control module to acquire the pressure control module detected pressure reducing valve running time, inlet pressure, outlet pressure and fluid flow curve in the pressure reducing valve;

[0041] a data verification module connected with the pressure control module to determine whether the fluid pressure control system operation meets the standard based on the coincidence degree of the fluid flow curve in the preset period of time acquired by the pressure control module and the preset fluid flow curve reference, and determine the reason why the fluid pressure control system operation does not meet the standard based on the calculated coincidence degree in the case of determining that the fluid pressure control system operation does not meet the standard; the data verification module is also used to re-determine the fluid flow curve reference based on the acquired coincidence degree.

[0042] Specifically, the calculation formula of the preset fluid flow curve reference is,

[0043] Q1=A1×0.33×P1×Y;

[0044] Q2=A2×0.11×P2;

[0045] Wherein, Q1 is the flow of the pressure reducing valve hole, unit Nm 3 / hour; Q2 is the flow of the outlet diameter of the pressure reducing valve, unit Nm 3 / hour; P1 is the inlet pressure, unit barabs (absolute pressure); P2 is the outlet pressure, unit barabs (absolute pressure); A1 is the area of the pressure reducing valve hole, unit mm 2 ; A2 is the area of the outlet diameter of the pressure reducing valve, unit mm 2 ; Y is the correction coefficient.

[0046] Specifically, the data verification module sets the correction coefficient Y=1 in the preset fluid flow curve reference when the inlet pressure P1 detected by the pressure control module is greater than 2 times the outlet pressure P2.

[0047] If the inlet pressure P1 is less than 2 times the outlet pressure P2, at this time the flow through the pressure reducing valve hole will be limited by the high outlet pressure, and the value of Y can be calculated by calculating the ratio of P2 and P1 as shown in Table 1:

[0048] Table 1 Correction coefficient table

[0049] P2 / P1 Correction factor Y 0.975 0.1 0.95 0.31 0.925 0.52 0.85 0.71 0.8 0.8 0.75 0.86 0.7 0.91 0.65 0.95 0.6 0.98 0.55 0.99 0.5 1

[0050] Please refer to Figure 2As shown in the figure, it is a determination flow chart of whether the fluid pressure control system operation meets the standard; the data verification module is used to determine whether the fluid pressure control system operation meets the standard based on the coincidence degree of the obtained fluid flow curve in the preset period and the preset fluid flow curve reference, wherein:

[0051] If the coincidence degree is less than or equal to the preset first reference, the data verification module determines that the fluid pressure control system operation does not meet the standard, and the data verification module determines the reason why the fluid pressure control system operation does not meet the standard based on the difference between the preset first reference and the obtained coincidence degree;

[0052] If the coincidence degree is greater than the preset first reference and less than or equal to the preset second reference, the data verification module preliminarily determines that the fluid pressure control system operation does not meet the standard, and the data verification module secondarily determines whether the fluid pressure control system operation meets the standard based on the difference between the obtained inlet pressure and outlet pressure;

[0053] If the coincidence degree is greater than the preset second reference, the data verification module determines that the fluid pressure control system operation meets the standard, and the data verification module saves the detected data in the preset period and continues to detect.

[0054] Among them, the preset first reference is 0.95, and the preset second reference is 0.99.

[0055] Please refer to Figure 3 As shown in the figure, it is a determination flow chart of the reason why the fluid pressure control system operation does not meet the standard; the data verification module is also used to determine the reason why the fluid pressure control system operation does not meet the standard based on the difference between the preset first reference and the obtained coincidence degree, wherein:

[0056] If the difference is less than or equal to the preset first difference reference, the data verification module determines that the reason why the fluid pressure control system operation does not meet the standard is the problem of the preset period reference, and the preset period reference is re-determined based on the difference between the obtained coincidence degree and the preset second reference;

[0057] If the difference is greater than the preset first difference reference and less than or equal to the preset second difference reference, the data verification module determines that the reason why the fluid pressure control system operation does not meet the standard is the problem of the preset fluid flow curve reference, and the fluid flow curve reference is re-determined based on the ratio of the difference between the obtained inlet pressure and outlet pressure and the preset reference;

[0058] If the difference is greater than the preset second difference reference, the data verification module determines that the reason why the fluid pressure control system operation does not meet the standard is the problem of the pressure reducing valve itself, and the pressure reducing valve is replaced.

[0059] The first preset difference reference is 0.04 and the second preset difference reference is 0.08.

[0060] Referring to Figure 4 The data verification module is used to determine whether the fluid pressure control system meets the standard based on the difference between the obtained inlet pressure and outlet pressure, and the second determination flowchart of whether the fluid pressure control system meets the standard is shown in FIG. 2. The data verification module is used to determine whether the fluid pressure control system meets the standard based on the difference between the obtained inlet pressure and outlet pressure, wherein:

[0061] If the difference is less than or equal to the preset difference reference, the data verification module determines that the fluid pressure control system meets the standard, saves the data detected in the preset period of time, and continues to detect.

[0062] If the difference is greater than the preset difference reference, the data verification module determines that the reason why the fluid pressure control system does not meet the standard is the problem of the spring in the pressure reducing valve, and re-determines the adjustment mode for the spring of the pressure reducing valve.

[0063] The preset difference reference is 0.02.

[0064] Specifically, the data verification module is used to set several adjustment modes for the spring of the pressure reducing valve based on the ratio of the difference between the obtained inlet pressure and outlet pressure to the preset reference, wherein:

[0065] If the ratio is less than or equal to the first preset ratio reference, the data verification module uses the first adjustment coefficient γ1 to adjust the position button of the spring of the pressure reducing valve to the corresponding value.

[0066] If the ratio is greater than the first preset ratio reference and less than or equal to the second preset ratio reference, the data verification module uses the second adjustment coefficient γ2 to adjust the position button of the spring of the pressure reducing valve to the corresponding value.

[0067] If the ratio is greater than the second preset ratio reference, the data verification module uses the third adjustment coefficient γ3 to adjust the position button of the spring of the pressure reducing valve to the corresponding value.

[0068] The first preset ratio reference is 0.95 and the second preset ratio reference is 0.98. The adjustment formula used by the present application is G=g×γ n , wherein g is the preset reference of the position of the spring of the pressure reducing valve before adjustment, G is the preset reference of the position of the spring of the pressure reducing valve after adjustment, n is a positive integer, and γ n is a preset adjustment coefficient. The present application sets γ1=0.99, γ2=0.97, and γ3=0.95.

[0069] Specifically, the data verification module is used to set several correction methods for the preset period length reference based on the difference between the obtained coincidence degree and the preset second reference, wherein:

[0070] If the difference is less than or equal to a preset first difference reference, the data verification module uses a first correction coefficient α1 to correct the preset period length reference button to a corresponding value;

[0071] If the difference is greater than the preset first difference reference and less than or equal to a preset second difference reference, the data verification module uses a second correction coefficient α2 to correct the preset period length reference button to a corresponding value;

[0072] If the difference is greater than the preset second difference reference, the data verification module uses a third correction coefficient α3 to correct the preset period length reference button to a corresponding value;

[0073] Wherein, the present application sets the preset first difference reference as 0.04, and the second difference reference as 0.08. The correction formula used in the present application is K=k×α n , wherein k is the preset period length reference before correction, K is the preset period length reference after correction, n is a positive integer, and α n is a preset correction coefficient. The present application sets α1=1.20; α2=1.15; and α3=1.10.

[0074] Specifically, the data verification module is used to set several correction methods for the fluid flow curve reference based on the ratio of the difference between the obtained inlet pressure and outlet pressure and a preset reference, wherein:

[0075] If the ratio is less than or equal to a preset first ratio reference, the data verification module uses a first correction coefficient ω1 to correct the fluid flow curve reference button to a corresponding value;

[0076] If the ratio is greater than the preset first ratio reference and less than or equal to a preset second ratio reference, the data verification module uses a second correction coefficient ω2 to correct the fluid flow curve reference button to a corresponding value;

[0077] If the ratio is greater than the preset second ratio reference, the data verification module uses a third correction coefficient ω3 to correct the fluid flow curve reference button to a corresponding value;

[0078] Wherein, the present application sets the first ratio reference as 0.95, and the second ratio reference as 0.98. The correction formula used in the present application is R=r×ω n , wherein r is the preset fluid flow curve reference before correction, R is the preset fluid flow curve reference after correction, n is a positive integer, and ω nFor the preset correction coefficient, the application sets ω1=0.85; ω2=0.90; ω3=0.95.

[0079] Specifically, the data verification module is used to store the standard-compliant fluid pressure control system reference data to the cloud.

[0080] So far, the technical solutions of the present application have been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical solutions after the changes or replacements will fall within the protection scope of the present application.

[0081] The above description is only the preferred embodiments of the present application and is not intended to limit the present application; for those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A fluid pressure control system based on a pressure reducing valve, characterized by, The application relates to a fluid pressure control system, comprising: a pressure control module connected with a pressure reducing valve, used to detect the inlet pressure and outlet pressure of the pressure reducing valve, and used to draw a fluid flow curve in a preset period based on the detected flow of the through hole of the pressure reducing valve and the flow of the outlet inner diameter of the pressure reducing valve; a parameter detection module connected with the pressure control module, used to acquire the running time, inlet pressure, outlet pressure and fluid flow curve of the pressure reducing valve detected by the pressure control module; a data verification module connected with the pressure control module, used to determine whether the fluid pressure control system meets the standard based on the coincidence degree of the fluid flow curve in the preset period acquired by the pressure control module and a preset fluid flow curve reference, and used to determine the reason why the fluid pressure control system does not meet the standard based on the coincidence degree of the fluid flow curve in the preset period and the preset fluid flow curve reference when it is determined that the fluid pressure control system does not meet the standard; the data verification module is further used to re-determine the preset period reference based on the difference between the acquired coincidence degree and a preset second reference, or re-determine the fluid flow curve reference based on the difference between the acquired inlet pressure and outlet pressure.

2. The reduced pressure valve-based fluid pressure control system of claim 1, wherein, The calculation formula of the preset fluid flow curve reference is Q1=A1*0.33*P1*Y; Q2=A2*0.11*P2, wherein Q1 is the flow of the through hole of the pressure reducing valve detected by the pressure control module, unit: Nm3 / hour; Q2 is the flow of the outlet inner diameter of the pressure reducing valve detected by the pressure control module, unit: Nm3 / hour; P1 is the inlet pressure detected by the pressure control module, unit: barabs (absolute pressure); P2 is the outlet pressure detected by the pressure control module, unit: barabs (absolute pressure); A1 is the area of the valve hole of the pressure reducing valve, unit: mm2; A2 is the area of the outlet inner diameter of the pressure reducing valve, unit: mm2; and Y is a correction coefficient. The data verification module is used to determine the reason why the fluid pressure control system does not meet the standard based on the difference between the preset first reference and the acquired coincidence degree when it is determined that the fluid pressure control system does not meet the standard based on the coincidence degree of the fluid flow curve in the preset period and the preset fluid flow curve reference; and the data verification module is used to secondarily determine whether the fluid pressure control system meets the standard based on the difference between the acquired inlet pressure and outlet pressure when it is preliminarily determined that the fluid pressure control system does not meet the standard. The data verification module is further used to determine the reason why the fluid pressure control system does not meet the standard based on the difference between the preset first reference and the acquired coincidence degree, wherein:

3. The reduced pressure valve-based fluid pressure control system of claim 2, wherein, the data verification module is used to re-determine the preset period reference based on the difference between the acquired coincidence degree and a preset second reference when it is determined that the reason why the fluid pressure control system does not meet the standard is that the preset period reference is problematic. ​ 4. The reduced pressure valve-based fluid pressure control system of claim 3, wherein, ​ ​ The data checking module re-determines the fluid flow curve reference based on the ratio of the obtained difference between the inlet pressure and the outlet pressure and the preset reference in the case that the fluid pressure control system operation does not meet the standard due to the preset fluid flow curve reference problem. The data checking module replaces the pressure reducing valve in the case that the fluid pressure control system operation does not meet the standard due to the pressure reducing valve itself problem.

5. The reduced pressure valve-based fluid pressure control system of claim 4, wherein, The data checking module re-determines the adjustment mode for the pressure reducing valve spring in the case that the fluid pressure control system operation does not meet the standard due to the pressure reducing valve spring problem based on the obtained difference between the inlet pressure and the outlet pressure.

6. The reduced pressure valve-based fluid pressure control system of claim 5, wherein, The data checking module provides several adjustment modes for the pressure reducing valve spring based on the ratio of the obtained difference between the inlet pressure and the outlet pressure and the preset reference, and the adjustment range of each adjustment mode is different.

7. The reduced pressure valve-based fluid pressure control system of claim 6, wherein, The data checking module provides several correction modes for the preset period length based on the obtained coincidence degree and the preset second reference, and the correction range of each correction mode is different.

8. The reduced pressure valve-based fluid pressure control system of claim 7, wherein, The data checking module provides several correction modes for the fluid flow curve reference based on the ratio of the obtained difference between the inlet pressure and the outlet pressure and the preset reference, and the correction range of each correction mode is different.

9. The reduced pressure valve-based fluid pressure control system of claim 2, wherein, The data checking module sets the correction coefficient Y=1 in the preset fluid flow curve reference in the case that the inlet pressure P1 detected by the pressure control module is greater than 2 times the outlet pressure P2.

10. The reduced pressure valve-based fluid pressure control system according to any one of claims 1 to 9, wherein, The data checking module stores the standard fluid pressure control system reference data to the cloud.

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