CN115200848B - Large-flow regulation and cutoff integrated valve test system and test method - Google Patents
Large-flow regulation and cutoff integrated valve test system and test method Download PDFInfo
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- CN115200848B CN115200848B CN202210823804.6A CN202210823804A CN115200848B CN 115200848 B CN115200848 B CN 115200848B CN 202210823804 A CN202210823804 A CN 202210823804A CN 115200848 B CN115200848 B CN 115200848B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/003—Machine valves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2876—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for valves
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Abstract
The invention discloses a large-flow adjusting and stopping integrated valve test system and a test method, and relates to the technical field of valve tests; the valve test device solves the problems of single test and poor test performance of the valve test in the prior art. The valve test system comprises an oil circuit system and an air circuit system which are communicated with the valve to be tested; the oil circuit system and the air circuit system are both connected with the control system; the gas circuit system comprises a gas inlet pipeline communicated with the gas inlet of the tested valve and a gas outlet pipeline communicated with the gas outlet of the tested valve, and a stop valve I, a pressure reducing valve and a gas inlet pressure test piece are sequentially arranged on the gas inlet pipeline along the gas source flow direction. According to the invention, the large-flow adjusting and stopping integrated valve test system capable of simultaneously working by an oil-gas system is adopted, the performance test of the adjusting valve is carried out by utilizing the large-flow air pressure system and the control hydraulic system, the test of flow characteristics, dynamic characteristics and total pressure recovery coefficient can be carried out on the large-flow valve, and the performance of the adjusting valve can be more accurately measured.
Description
Technical Field
The invention relates to the technical field of valve tests, in particular to a large-flow adjusting and stopping integrated valve test system and a test method.
Background
The regulating valve is used for a certain type of flow regulating control system, and can continuously and normally work for not less than 2 hours under the conditions that the temperature of a working medium is 500 ℃, the pressure is 2-7 MPa and the flow is 0-3.5 kg/s. The existing test bed is only a simple oil source or air source, does not have the capability of simultaneously working oil and air, and has low flow rate and insufficient measurement capability in large flow rate for the produced regulating valve.
In the prior art, a general valve performance test device with the publication number of CN 104359661B is provided with the capability of oil and gas working, but has low test flow and is mainly used for sealing performance test. In order to more accurately measure the performance of the regulating valve, it is necessary to design and build a large-flow regulating and cut-off integrated valve test system and test method.
Disclosure of Invention
Aiming at the defects in the background technology, the invention provides a large-flow adjusting and stopping integrated valve test system and a test method, which solve the problems of single test and poor test performance of the valve test in the prior art.
The technical scheme of the invention is realized as follows: a large flow regulation and cut-off integrated valve test system comprises an oil circuit system and an air circuit system which are communicated with a tested valve; the oil circuit system and the air circuit system are both connected with the control system; the gas circuit system comprises a gas inlet pipeline communicated with a gas inlet of the tested valve and a gas outlet pipeline communicated with a gas outlet of the tested valve, a stop valve I, a pressure reducing valve and a gas inlet pressure test piece are sequentially arranged on the gas inlet pipeline along the gas source flow direction, a gas cylinder group and a gas flowmeter are arranged on the gas inlet pipeline between the pressure reducing valve and the gas inlet pressure test piece, and a stop valve II is arranged on a pipeline communicated with the gas cylinder group and the gas inlet pipeline; an air outlet pressure test piece and a throttle valve are sequentially arranged on the air outlet pipe along the air source flow direction;
The oil way system comprises a liquid inlet pipeline communicated with a liquid inlet of the tested valve and a liquid outlet pipeline communicated with a liquid outlet of the tested valve; a fixed displacement pump, a pressure regulating valve, a first precise oil filter and a feed liquid pressure test piece are sequentially arranged on the feed liquid pipeline along the flowing direction of oil liquid; a liquid outlet pressure test piece, an oil return back pressure valve, a stop valve III, a second precise oil filter and a radiator are sequentially arranged on the liquid outlet pipeline along the flowing direction of oil; a sampling pipeline is connected to the liquid outlet pipeline between the stop valve III and the second precise oil filter, and a sampling switch is arranged on the sampling pipeline.
A gas filter and a pressure gauge I are arranged on the gas inlet pipeline between the pressure reducing valve and the gas flowmeter; a temperature sensor I is arranged on an air inlet pipeline between the air inlet pressure test piece and the tested valve; and a temperature sensor II is arranged on the air outlet pipe between the air outlet pressure test piece and the throttle valve.
The air inlet pressure test piece comprises an air inlet pressure gauge and a pressure transmitter I, wherein the pressure transmitter I is connected to a pipeline between the air inlet pressure gauge and an air inlet pipeline.
The air outlet pressure test piece comprises an air outlet pressure gauge and a pressure transmitter II, and the pressure transmitter II is connected to a pipeline between the air outlet pressure gauge and an air outlet pipeline.
The liquid inlet end of the liquid inlet pipeline and the liquid outlet end of the liquid outlet pipeline are communicated with an oil tank, a liquid level meter is arranged on the oil tank, and an oil drain switch is arranged at the bottom of the oil tank.
A one-way valve, a liquid filter and a safety valve are arranged on a liquid inlet pipeline between the pressure regulating valve and the first precise oil filter, and the safety valve is connected with the pressure regulating valve in parallel; the liquid inlet pipeline is also provided with a pressure gauge II; a liquid flowmeter and a pressure gauge III are arranged on a liquid outlet pipeline between the liquid outlet pressure test piece and the oil return back pressure valve.
The feed liquid pressure testing piece comprises a feed liquid pressure meter and a pressure transducer III, and the pressure transducer III is connected to a pipeline between the feed liquid pressure meter and a feed liquid pipeline; the liquid outlet pressure test piece comprises a liquid outlet pressure gauge and a pressure transmitter IV, and the pressure transmitter IV is connected to a pipeline between the liquid outlet pressure gauge and a liquid outlet pipeline.
An explosion-proof motor is connected to the quantitative pump; the tested valve is provided with a displacement sensor and a servo valve, and the displacement sensor and the servo valve are connected with a control system.
The test method of the large-flow regulation and cutoff integrated valve test system comprises a flow characteristic test method, a dynamic characteristic test method and a total pressure recovery coefficient test method;
the flow characteristic testing method comprises the following specific steps:
S1: before the test, confirming that a pressure regulating valve, a stop valve III and a sampling switch in an oil circuit system are in a closed state; confirming that a stop valve I, a stop valve II and a throttle valve in the gas circuit system are in a closed state;
S2: opening a constant displacement pump and a pressure regulating valve to enable the pressure of a liquid inlet pipeline of the oil circuit system to reach a set pressure value; the oil return back pressure valve is regulated, so that the pressure of a liquid outlet pipeline of the oil circuit system reaches a required pressed value;
S3: the air source is connected, the stop valve I and the throttle valve are opened, the pressure reducing valve is regulated to enable the air path pressure of the air inlet pipeline to reach a set value, and the pressure of the liquid inlet pipeline of the oil path system is higher than the air path pressure of the air inlet pipeline by at least 2MPa;
S4: according to the set different displacement data, the control system controls the movement of a piston of a tested valve through a servo valve, the tested valve is provided with a displacement sensor to transmit displacement information to the control system, and the control system records the flow value of an air inlet pipeline in a state corresponding to the displacement data according to a gas flowmeter on the air inlet pipeline;
S5: drawing a displacement flow curve according to the displacement data and the flow value in the step S4, and judging whether the tested valve is qualified according to the linearity of the displacement flow curve;
S6: after the test is finished, the air source is disconnected, the stop valve I is closed, the stop valve II is opened to exhaust residual gas in the air path system, and then the throttle valve and the stop valve II are closed; then closing the pressure regulating valve and the oil return back pressure valve, and finally closing the constant delivery pump;
The dynamic characteristic test method comprises the following specific steps:
C1: before the test, confirming that a pressure regulating valve, a stop valve III, a sampling switch and an oil return back pressure valve in the oil circuit system are all in a closed state; confirming that a stop valve I, a stop valve II and a throttle valve in the gas circuit system are in a closed state;
C2: opening a constant displacement pump, a pressure regulating valve and a stop valve III to enable the pressure of a liquid inlet pipeline of the oil circuit system to reach a set pressure value;
and C3: the air source is connected, the stop valve I and the throttle valve are opened, the pressure reducing valve is regulated to enable the air path pressure of the air inlet pipeline to reach a set value, and the pressure of the liquid inlet pipeline of the oil path system is higher than the air path pressure of the air inlet pipeline by at least 2MPa;
and C4: the control system adjusts the current of the servo valve from the minimum value to the maximum value, and meanwhile, the tested valve transmits a 0-bit displacement signal and a maximum-bit displacement signal to the controller through the self-contained displacement sensor of the tested valve, and the control system analyzes the time t1 required from 0 bit to the maximum bit; then the control system adjusts the current of the servo valve from the maximum value to the minimum value, and meanwhile, the tested valve is provided with a displacement sensor to transmit a maximum displacement signal and a 0-bit displacement signal to the controller, and the control system analyzes the time t2 required by the maximum position to the 0-bit;
c5: judging whether the tested valve is qualified or not according to whether t1 and t2 in the step are in an error range or not;
C6: after the test is finished, the air source is disconnected, the stop valve I is closed, the stop valve II is opened to exhaust residual gas in the air path system, and then the throttle valve and the stop valve II are closed; then closing the pressure regulating valve and the oil return back pressure valve, and finally closing the constant delivery pump;
the total pressure recovery coefficient testing method comprises the following specific steps:
D1: before the test, confirming that a pressure regulating valve, a stop valve III and a sampling switch in an oil circuit system are in a closed state; confirming that a stop valve I, a stop valve II and a throttle valve in the gas circuit system are in a closed state;
d2: opening a constant displacement pump and a pressure regulating valve to enable the pressure of a liquid inlet pipeline of the oil circuit system to reach a set pressure value; the oil return back pressure valve is regulated, so that the pressure of a liquid outlet pipeline of the oil circuit system reaches a required pressed value;
d3: the air source is connected, the stop valve I and the throttle valve are opened, the pressure reducing valve is regulated to enable the air path pressure of the air inlet pipeline to reach a set value, and the pressure of the liquid inlet pipeline of the oil path system is higher than the air path pressure of the air inlet pipeline by at least 2MPa;
d4: after the test data of the gas flowmeter in the gas inlet pipeline is stable, slowly closing the throttle valve; in the closing process of the throttle valve, the air inlet pressure test piece and the air outlet pressure test piece record the air inlet pressure P1 of the tested valve and the air outlet pressure P2 of the tested valve at different moments respectively, and signal information of the P1 and the P2 is transmitted to the control system;
D5: the control system processes the inlet pressure P1 of the tested valve and the outlet pressure P2 of the tested valve, and judges whether the tested valve is qualified or not according to whether the value of P2/P1 is in an error range or not;
D6: after the test is finished, the air source is disconnected, the stop valve I is closed, the stop valve II is opened to exhaust residual gas in the air path system, and then the throttle valve and the stop valve II are closed; and then closing the pressure regulating valve and the oil return back pressure valve, and finally closing the constant delivery pump.
In the process of the steps S4, C4 and D4, the pressure of the liquid inlet pipeline of the oil circuit system is always at least 2MPa higher than the gas circuit pressure of the air inlet pipeline.
The invention adopts a large-flow adjusting and stopping integrated valve test system which can work simultaneously by an oil-gas system, and utilizes a large-flow air pressure system and a control hydraulic system to perform performance test of a regulating valve, so that the performance of the regulating valve can be measured more accurately to ensure accurate and error-free performance test of products, and in addition, tightness and displacement test tests can be performed to ensure that the requirements of test parameters are met. The air circuit system controls the system flow through the throttle valve to form a double-throat system, so that the testing accuracy of the system flow is ensured. The invention has simple structure system, reduces the test cost, has simple operation, higher precision and higher popularization value.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings that are required for the description of the embodiments will be briefly described below, it being apparent that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic diagram of the valve test system of the present invention.
FIG. 2 is a graph showing the relationship between flow and displacement under a pressure of 1 MPa.
FIG. 3 is a linear analysis of flow versus displacement for a pressure of 1 MPa.
FIG. 4 is a graph showing the relationship between flow and displacement under a pressure of 2 MPa.
FIG. 5 is a linear analysis of flow versus displacement for a pressure of 2 MPa.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, in embodiment 1, a valve test system with integrated high flow rate adjustment and cutoff includes an oil path system and an air path system which are communicated with a valve 34 to be tested; the oil circuit system and the gas circuit system are both connected with the control system. In the embodiment, the oil path system is a control oil path system, the working medium of the oil path system is preferably aviation kerosene, and the working pressure is required to be provided for test and is 2-12 MPa; during the test, the working flow is required to be provided at 0-30L/min; certain cooling performance is required to be provided to ensure that the temperature of the product is not more than 200 ℃. The gas path system is a main working system, and the working medium is preferably compressed air or nitrogen; the pressure adjustable range of the gas circuit system is 0-7 MPa; the maximum test working flow rate is 3.5kg/s; the temperature of the test medium is not lower than 500 ℃; the continuous working time is not less than 2 hours. The control system is a control center of the whole test system, and mainly comprises a controller (an industrial personal computer or an upper computer), a signal receiving module, a signal processing module and the like, can receive and process collected data, and can correspondingly control the actions of the oil circuit system gas circuit system and the tested valve 34, so that the test precision is improved.
The gas path system comprises a gas inlet pipeline A1 communicated with the gas inlet of the tested valve 34 and a gas outlet pipeline A2 communicated with the gas outlet of the tested valve 34, wherein a stop valve I1, a pressure reducing valve 2 and a gas inlet pressure test piece are sequentially arranged on the gas inlet pipeline A1 along the gas source flow direction. The stop valve I1 controls the opening and closing of the air inlet pipeline A1, the pressure reducing valve adjusts the pressure in the air inlet pipeline A1, and the air inlet pressure test piece is used for detecting the pressure in the air inlet pipeline A1 and transmitting signals to the control system. An air cylinder group 36 and an air flow meter 5 are arranged on an air inlet pipeline A1 between the pressure reducing valve 2 and the air inlet pressure test piece. The gas flowmeter is used for detecting the flow rate on the air inlet pipeline A1 and transmitting a flow rate signal to the control system. When the dynamic characteristic test is carried out, the tested piece is fully opened to fully closed, the time is not more than 0.5s, the pressure is suddenly changed when the tested piece is opened and closed in a short time, the requirement on the pressure reducing valve 2 is higher, and if the feedback of the pressure reducing valve is not timely, the pressure of the system is instantaneously increased, so that potential safety hazards exist. The gas cylinder group is added after the pressure reducing valve 2, the system pressurization is reduced at the moment of closing by the test piece, the system pressurization is ensured to be not more than the use requirement through calculating the gas cylinder volume, and the test safety is improved. The pipeline of the gas cylinder group 36 communicated with the gas inlet pipeline A1 is provided with a stop valve II 13 to realize the on-off of pipeline gas. The air outlet pipeline A2 is sequentially provided with an air outlet pressure test piece and a throttle valve 12 along the air source flow direction. The air outlet pressure test piece is used for detecting the air pressure on the air outlet pipeline A2 and transmitting signals to the control system in time. Because the flow rate of the gas circuit system is from 50g/s to 3500g/s, the deviation of the test data of the flowmeter is larger in the case of small flow rate, and in order to improve the situation, the flow rate of the system is controlled through the throttle valve 12, so that a double-throat system is formed, and the test accuracy of the flow rate of the system is ensured.
Further, the oil circuit system comprises a liquid inlet pipeline B1 communicated with the liquid inlet of the tested valve 34 and a liquid outlet pipeline B2 communicated with the liquid outlet of the tested valve 34; the liquid inlet end of the liquid inlet pipeline B1 and the liquid outlet end of the liquid outlet pipeline B2 are communicated with the oil tank 35 to form a finished liquid circulation loop. The oil tank 35 is provided with a liquid level meter 32 for monitoring the quantity of oil in the oil tank in real time. The bottom of the oil tank 35 is provided with an oil drain switch 33, the oil drain switch 33 is opened, and the oil in the oil tank is discharged outwards. The liquid inlet pipeline B1 in this embodiment is sequentially provided with a dosing pump 14, a pressure regulating valve 19, a first precise oil filter 20 and a liquid inlet pressure test piece along the flowing direction of the oil. An explosion-proof motor is connected to the dosing pump 14, and a pressure regulating valve 19 is used for regulating the pressure on the liquid inlet pipeline B1. The first precise oil filter 20 is a high-precision oil filter, so that the cleanliness of oil entering a tested piece is improved, and the test precision is further improved. The feed liquid pressure test piece is used for detecting the oil pressure on the feed liquid pipeline B1 and can timely transmit a pressure signal to the control system. A liquid outlet pressure test piece, an oil return back pressure valve 27, a stop valve III 28, a second precise oil filter 30 and a radiator 31 which are arranged in parallel are sequentially arranged on the liquid outlet pipeline B2 along the flowing direction of oil. The liquid outlet pressure test piece is used for detecting the oil pressure on the liquid outlet pipeline B2 and transmitting a pressure signal to the control system in time. The oil return back pressure valve 27 and the stop valve III 28 are arranged in parallel and are respectively used for adjusting the back pressure on the liquid outlet pipeline B2 and controlling the on-off of oil on the liquid outlet pipeline B2. The second precise oil filter 30 has the same structure as the first precise oil filter 20, is a high-precision oil filter, and improves the cleanliness of the oil in the return oil tank. The radiator 31 takes away the heat in the tested piece through oil circulation, so that the temperature in the tested piece is controlled, and the displacement sensor, the servo valve and each nonmetallic piece are ensured to work normally. A sampling pipeline 37 is connected to the liquid outlet pipeline B2 between the stop valve III 28 and the second precise oil filter 30, a sampling switch 29 is arranged on the sampling pipeline 37, and the setting of the sampling switch 29 is convenient for oil sampling.
Example 2, a valve test system integrating large flow regulation and cutoff, based on example 1, is a preferred scheme: an air inlet pipeline A1 between the pressure reducing valve 2 and the air flowmeter 5 is provided with an air filter 4 and a pressure gauge I3. The gas filter 4 is used for filtering the gas entering the tested piece and improving the gas source cleanliness. The pressure gauge I3 is used for detecting and displaying the pressure on the air inlet pipeline A1. And a temperature sensor I8 is arranged on the air inlet pipeline A1 between the air inlet pressure test piece and the tested valve 34 and is used for detecting the temperature of air in the air inlet pipeline A1. A temperature sensor II 11 is arranged on the air outlet pipeline A2 between the air outlet pressure test piece and the throttle valve 12 and is used for detecting the temperature of the air in the air outlet pipeline A2.
Specifically, the air inlet pressure test piece comprises an air inlet pressure gauge 7 and a pressure transmitter I6, and the pressure transmitter I6 is connected to a pipeline between the air inlet pressure gauge 7 and an air inlet pipeline A1. The air outlet pressure test piece comprises an air outlet pressure gauge 10 and a pressure transmitter II 9, and the pressure transmitter II 9 is connected to a pipeline between the air outlet pressure gauge 10 and an air outlet pipeline A2. The pressure transmitters I, II are comprised of load cell sensors (also known as pressure sensors), measurement circuitry and process connections. The pressure sensor can convert physical pressure parameters such as gas, liquid and the like sensed by the load cell sensor into standard electrical signals (such as 4-20 mADC and the like) so as to supply secondary instruments such as an indication alarm instrument, a recorder, a regulator and the like for measurement, indication and process regulation.
Further, a check valve 15, a liquid filter 16 and a relief valve 18 are provided on the liquid inlet line B1 between the pressure regulating valve 19 and the first precision oil filter 20, and the relief valve 18 is provided in parallel with the pressure regulating valve 19. The liquid inlet pipeline B1 is also provided with a pressure gauge II 17, and the pressure gauge II 17 is used for detecting and displaying the pressure on the liquid inlet pipeline B1. A liquid flowmeter 25 and a pressure gauge III 26 are arranged on the liquid outlet pipeline B2 between the liquid outlet pressure test piece and the oil return back pressure valve 27. The liquid flow meter 25 is used for detecting the liquid flow rate on the liquid outlet pipeline B2. The pressure gauge III 26 is used for detecting and displaying the pressure on the liquid outlet pipeline B2.
Specifically, the feed liquid pressure testing piece comprises a feed liquid pressure meter 22 and a pressure transducer III 21, and the pressure transducer III 21 is connected to a pipeline between the feed liquid pressure meter 22 and a feed liquid pipeline B1; the liquid outlet pressure test piece comprises a liquid outlet pressure gauge 24 and a pressure transmitter IV 23, and the pressure transmitter IV 23 is connected to a pipeline between the liquid outlet pressure gauge 24 and a liquid outlet pipeline B2. Pressure transmitters III, IV are comprised primarily of load cell sensors (also known as pressure sensors), measurement circuitry, and process connections. The physical pressure parameters such as gas, liquid and the like sensed by the load cell sensor can be converted into standard electrical signals (such as 4-20 mADC) so as to be supplied to secondary instruments such as an indication alarm instrument, a recorder, a regulator and the like for measurement, indication and process adjustment.
The valve under test 34 in this embodiment is provided with a displacement sensor and a servo valve which are connected to the control system. The displacement sensor is used for detecting the movement displacement of the piston in the valve, and the servo valve correspondingly outputs the modulated flow and pressure after receiving the electric analog signal. The device is an electrohydraulic conversion element and a power amplification element, and can convert a low-power weak electric input signal into high-power hydraulic energy (flow and pressure) for output. In the electrohydraulic servo system, an electric part and a hydraulic part are connected to realize the conversion and hydraulic amplification of electrohydraulic signals. The electrohydraulic servo valve is the core of electrohydraulic servo system control.
Example 3: the test method of the large-flow-rate adjustment and cutoff integrated valve test system of embodiment 1 or 2, comprising a flow characteristic test method, a dynamic characteristic test method, and a total pressure recovery coefficient test method. Wherein the oil circuit system and the gas circuit system meet the following requirements:
The oil circuit system is a control oil circuit system, the working medium of the oil circuit system is preferably aviation kerosene, and the working pressure is required to be provided for test and is 2 MPa-12 MPa; during the test, the working flow is required to be provided at 0-30L/min; certain cooling performance is required to be provided to ensure that the temperature of the product is not more than 200 ℃.
The gas path system is a main working system, and the working medium is preferably compressed air or nitrogen; the pressure adjustable range of the gas circuit system is 0-7 MPa; the maximum test working flow rate is 3.5kg/s; the temperature of the test medium is not lower than 500 ℃; the continuous working time is not less than 2 hours.
The data acquisition device of the control system is connected with a pressure transmitter (serial numbers 6,9, 21 and 23), a temperature sensor (serial numbers 8 and 11), a flowmeter, a displacement sensor (product self-contained) and a servo valve (product self-contained) and respectively carries out real-time feedback and control so as to respectively acquire feedback values from the pressure transmitter, the temperature sensor, the displacement sensor and the flowmeter and current feedback values of the servo valve, and the pressure difference before and after the tested valve is mastered in real time through the pressure feedback values; grasping the system test temperature in real time through the feedback value of the temperature sensor; the opening of the tested piece is controlled in real time through the feedback value of the displacement sensor, the current of the servo valve is controlled, when the displacement value changes, data are uploaded to the industrial personal computer through the data acquisition device, the industrial personal computer immediately feeds information back to the servo valve, and the servo valve adjusts the current value to control the flow and the pressure difference of the oil circuit system according to the feedback information so as to ensure that the displacement of the tested piece is stable. The industrial personal computer is connected with the data acquisition device and the control device, and the three devices form a feedback control loop. Specifically, when receiving a displacement feedback value transmitted by the data acquisition device, the industrial personal computer compares the displacement feedback value with a preset displacement value, and if the displacement feedback value does not reach the preset displacement value, the industrial personal computer issues a servo valve current adjustment instruction to the control device so as to adjust the flow and the pressure of a tested piece, so that the displacement of the tested piece reaches a required value; when the displacement reaches a set value, the current of the servo valve is kept unchanged, and the pressure and the flow of the tested piece and the system reach stability.
Based on the oil circuit system, the gas circuit system and the control system, the flow characteristic testing method comprises the following specific steps:
s1: before the test, confirming that a pressure regulating valve 19, a stop valve III 28 and a sampling switch 29 in the oil circuit system are in a closed state; and confirming that the stop valve I1, the stop valve II 13 and the throttle valve 12 in the gas circuit system are in a closed state.
S2: opening the constant delivery pump 14 and the pressure regulating valve 19 to enable the pressure of the liquid inlet pipeline B1 of the oil circuit system to reach a set pressure value; the return back pressure valve 27 is adjusted so that the pressure of the liquid outlet line B2 of the oil line system reaches a desired pressure value (pressure value).
S3: the air source is connected, the stop valve I1 and the throttle valve 12 are opened, the pressure reducing valve 2 is regulated to enable the air path pressure of the air inlet pipeline A1 to reach a set value, the pressure of the liquid inlet pipeline B1 of the oil path system is at least 2MPa higher than the air path pressure of the air inlet pipeline A1, and the air in the air inlet pipeline A1 is prevented from entering the oil path system.
S4: according to the set different displacement data, the control system controls the movement of the piston of the tested valve 34 through the servo valve, the tested valve 34 is provided with a displacement sensor to transmit displacement information to the control system, and the control system records the flow value of the air inlet pipeline A1 in the state of corresponding displacement data according to the air flow meter 5 on the air inlet pipeline A1; in the process of the step S4, the pressure of a liquid inlet pipeline B1 of the oil circuit system is always at least 2MPa higher than the gas circuit pressure of a gas inlet pipeline A1; that is, after the pressure of the air inlet pipeline A1 is changed, the pressure of the liquid inlet pipeline B1 of the oil circuit system is correspondingly adjusted, and the pressure are always in a dynamic balance state. For example: when the gas path pressure of the gas inlet pipeline A1 is 1Mpa and the displacement is 3mm, a flow value of 70g/s is obtained; when the displacement is 4mm, the flow value is 130g/s; thus, a plurality of groups of data are recorded, then the pressure of the air path of the air inlet pipeline A1 is changed, and a group of data is obtained.
S5: drawing a displacement flow curve under different pressure working conditions according to the displacement data and the flow value in the step S4, and judging whether the tested valve 34 is qualified according to the linearity of the displacement flow curve; i.e. the linearity error is acceptable within 5%, otherwise it is an unacceptable product.
S6: after the test is finished, the air source is disconnected, the stop valve I1 is closed, the stop valve II 13 is opened to exhaust residual gas in the air path system, and then the throttle valve 12 and the stop valve II 13 are closed; then the pressure regulating valve 19 and the oil return back pressure valve 27 are closed, and finally the dosing pump 14 is closed.
Taking a tested valve as a regulating valve with a specific model (product 007-3 MPa) as an example, according to the flow characteristic testing method, a displacement flow curve formed by drawing the following groups of displacement data and flow values is obtained:
FIG. 2 is a graph showing the relationship between flow and displacement under the working condition of 1 MPa; then, the linearity analysis of the relation curve of the flow and the displacement under the working condition of the pressure of 1MPa in the figure 3 is obtained through calculation of a control system, and according to the figures 2 and 3, the correlation coefficient (R square) of the linear fitting of the pressure and the flow under the working condition of the pressure of 1MPa is 99.682%, the linearity (nonlinear error) is 0.318%, and the conditions are met; the error is within 5%, and the product is a qualified product.
FIG. 4 is a graph showing the relationship between flow and displacement under a pressure of 2 MPa; then, calculating by a control system to obtain the linearity analysis of the relation curve of the flow and the displacement under the working condition of the pressure of 2MPa in the figure 5, and according to figures 4 and 5, obtaining the correlation coefficient (R square) 99.838 percent of the linear fitting of the pressure and the flow under the working condition of the pressure of 2MPa, wherein the linearity (nonlinear error) is 0.162 percent and is not more than 5 percent, so that the conditions are satisfied; the error is within 4%.
According to the method, continuously drawing a relation curve of flow and displacement under the working conditions of 3MPa, 4MPa, 5MPa, 6MPa and 7MPa, and judging whether the product is qualified or not according to the linear fitting correlation coefficient (R square) of the pressure and the flow and the linearity (nonlinear error). In addition, the control system can also generate corresponding flow relation curves under different pressures in real time according to the pressure, flow, temperature and displacement actual measurement values fed back by the pressure sensor, the flow sensor, the displacement sensor and the temperature sensor.
The dynamic characteristic testing method is based on the oil circuit system, the gas circuit system and the control system, and comprises the following specific steps:
C1: before the test, the pressure regulating valve 19, the stop valve III 28, the sampling switch 29 and the oil return back pressure valve 27 in the oil circuit system are all in a closed state; confirming that a stop valve I1, a stop valve II 13 and a throttle valve 12 in the gas circuit system are in a closed state;
c2: opening the constant delivery pump 14, the pressure regulating valve 19 and the stop valve III 28 to enable the pressure of the liquid inlet pipeline B1 of the oil circuit system to reach a set pressure value;
and C3: the air source is connected, the stop valve I1 and the throttle valve 12 are opened, the pressure reducing valve 2 is regulated to enable the air path pressure of the air inlet pipeline A1 to reach a set value, and the pressure of the liquid inlet pipeline B1 of the oil path system is enabled to be at least 2MPa higher than the air path pressure of the air inlet pipeline A1; the gas in the intake pipe A1 is prevented from entering the oil passage system.
And C4: the control system adjusts the current of the servo valve from the minimum value to the maximum value, meanwhile, the tested valve 34 transmits a 0-bit displacement signal and a maximum-bit displacement signal to the controller through the piston of the tested valve 34 by the self-contained displacement sensor, and the control system analyzes the time t1 required from 0 bit to the maximum bit; then the control system adjusts the current of the servo valve from the maximum value to the minimum value, and meanwhile, the tested valve 34 transmits a maximum displacement signal and a 0-bit displacement signal to the controller through the piston of the tested valve 34 by the self-contained displacement sensor, and the control system analyzes the time t2 required by the maximum position to the 0 position; in the process of the step C4, the pressure of the liquid inlet pipeline B1 of the oil circuit system is always at least 2MPa higher than the gas circuit pressure of the gas inlet pipeline A1.
C5: and judging whether the tested valve 34 is qualified or not according to whether t1 and t2 in the step are within an error range (0-0.5 s). The method comprises the following steps: when the air path pressure of the air inlet pipeline A1 is 1MPa and the pressure of the liquid inlet pipeline B1 of the oil path system is 3MPa, the time t1 = 0.32s from 0 position to the maximum position of the tested valve, the time t2 = 0.34 s from the maximum position to the 0 position of the tested valve, t1 is less than 0.5s, t2 is less than 0.5s, and the dynamic characteristic meets the standard, and the tested valve is a qualified product.
C6: after the test is finished, the air source is disconnected, the stop valve I1 is closed, the stop valve II 13 is opened to exhaust residual gas in the air path system, and then the throttle valve 12 and the stop valve II 13 are closed; then the pressure regulating valve 19 and the oil return back pressure valve 27 are closed, and finally the dosing pump 14 is closed.
The total pressure recovery coefficient testing method based on the oil circuit system, the gas circuit system and the control system comprises the following specific steps:
d1: before the test, confirming that a pressure regulating valve 19, a stop valve III 28 and a sampling switch 29 in the oil circuit system are in a closed state; confirming that a stop valve I1, a stop valve II 13 and a throttle valve 12 in the gas circuit system are in a closed state;
D2: opening the constant delivery pump 14 and the pressure regulating valve 19 to enable the pressure of the liquid inlet pipeline B1 of the oil circuit system to reach a set pressure value; the oil return back pressure valve 27 is regulated to enable the pressure of the liquid outlet pipeline B2 of the oil way system to reach a required pressed value;
D3: the air source is connected, the stop valve I1 and the throttle valve 12 are opened, the pressure reducing valve 2 is regulated to enable the air path pressure of the air inlet pipeline A1 to reach a set value, and the pressure of the liquid inlet pipeline B1 of the oil path system is enabled to be at least 2MPa higher than the air path pressure of the air inlet pipeline A1; the gas in the intake pipe A1 is prevented from entering the oil passage system.
D4: after the test data of the gas flowmeter on the air inlet pipeline A1 is stable, slowly closing the throttle valve 12; in the closing process of the throttle valve 12, the air inlet pressure test piece and the air outlet pressure test piece record the air inlet pressure P1 of the tested valve and the air outlet pressure P2 of the tested valve at different moments respectively, and signal information of the P1 and the P2 is transmitted to a control system; in the process of step D4, the pressure of the liquid inlet pipeline B1 of the oil circuit system is always at least 2MPa higher than the gas circuit pressure of the gas inlet pipeline A1.
D5: the control system processes the inlet pressure P1 of the tested valve and the outlet pressure P2 of the tested valve, and judges whether the tested valve 34 is qualified or not according to whether the value of P2/P1 is within an error range (85% -100%).
The method comprises the following steps: when the pressure of the liquid inlet pipeline B1 of the oil circuit system is 3MPa, the gas circuit pressure of the gas inlet pipeline A1 is the gas inlet pressure P1=1 MPa of the tested valve, the gas circuit pressure of the gas outlet pipeline A2 is the gas outlet pressure P2=0.95 MPa of the tested valve, P2/P1=95% > 85%, and the total pressure recovery coefficient accords with the standard, so that the tested valve is a qualified product.
D6: after the test is finished, the air source is disconnected, the stop valve I1 is closed, the stop valve II 13 is opened to exhaust residual gas in the air path system, and then the throttle valve 12 and the stop valve II 13 are closed; then the pressure regulating valve 19 and the oil return back pressure valve 27 are closed, and finally the dosing pump 14 is closed.
The method can accurately test flow characteristics, dynamic characteristics and total pressure recovery coefficient, can also perform tightness and displacement test tests, ensures that the test parameter requirements are met, more accurately determines the performance of the regulating valve, and ensures that the performance test of the product is accurate and error-free.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (9)
1. A test method of a large-flow regulation and cutoff integrated valve test system is characterized by comprising the following steps of: the large-flow regulation and cutoff integrated valve test system comprises an oil circuit system and an air circuit system which are communicated with a valve (34) to be tested; the oil circuit system and the air circuit system are both connected with the control system; the gas path system comprises a gas inlet pipeline (A1) communicated with a gas inlet of a tested valve (34) and a gas outlet pipeline (A2) communicated with a gas outlet of the tested valve (34), wherein a stop valve I (1), a pressure reducing valve (2) and a gas inlet pressure test piece are sequentially arranged on the gas inlet pipeline (A1) along the gas source flow direction, a gas cylinder group (36) and a gas flowmeter (5) are arranged on the gas inlet pipeline (A1) between the pressure reducing valve (2) and the gas inlet pressure test piece, and a stop valve II (13) is arranged on a pipeline communicated with the gas cylinder group (36) and the gas inlet pipeline (A1); an air outlet pressure test piece and a throttle valve (12) are sequentially arranged on the air outlet pipeline (A2) along the air source flow direction;
The oil way system comprises a liquid inlet pipeline (B1) communicated with a liquid inlet of the tested valve (34) and a liquid outlet pipeline (B2) communicated with a liquid outlet of the tested valve (34); a fixed displacement pump (14), a pressure regulating valve (19), a first precise oil filter (20) and a feed liquid pressure test piece are sequentially arranged on the feed liquid pipeline (B1) along the flowing direction of oil liquid; a liquid outlet pressure test piece, an oil return back pressure valve (27) and a stop valve III (28) which are arranged in parallel, a second precise oil filter (30) and a radiator (31) are sequentially arranged on the liquid outlet pipeline (B2) along the flowing direction of oil liquid; a sampling pipeline (37) is connected to a liquid outlet pipeline (B2) between the stop valve III (28) and the second precise oil filter (30), and a sampling switch (29) is arranged on the sampling pipeline (37);
The test method comprises a flow characteristic test method, a dynamic characteristic test method and a total pressure recovery coefficient test method;
the flow characteristic testing method comprises the following specific steps:
s1: before the test, confirming that a pressure regulating valve (19), a stop valve III (28) and a sampling switch (29) in the oil circuit system are in a closed state; confirming that a stop valve I (1), a stop valve II (13) and a throttle valve (12) in the gas circuit system are in a closed state;
S2: opening a constant delivery pump (14) and a pressure regulating valve (19) to enable the pressure of a liquid inlet pipeline (B1) of the oil circuit system to reach a set pressure value; the oil return back pressure valve (27) is regulated to enable the pressure of a liquid outlet pipeline (B2) of the oil way system to reach a required pressed value;
s3: the air source is connected, the stop valve I (1) and the throttle valve (12) are opened, the pressure reducing valve (2) is regulated to enable the air path pressure of the air inlet pipeline (A1) to reach a set value, and the pressure of the liquid inlet pipeline (B1) of the oil path system is higher than the air path pressure of the air inlet pipeline (A1) by at least 2MPa;
S4: according to the set different displacement data, the control system controls the movement of a piston of the tested valve (34) through a servo valve, the tested valve (34) is provided with a displacement sensor to transmit displacement information to the control system, and the control system records the flow value of the air inlet pipeline (A1) in a state corresponding to the displacement data according to the air flow meter (5) on the air inlet pipeline (A1);
S5: drawing a displacement flow curve according to the displacement data and the flow value in the step S4, and judging whether the tested valve (34) is qualified according to the linearity of the displacement flow curve;
s6: after the test is finished, the air source is disconnected, the stop valve I (1) is closed, the stop valve II (13) is opened to exhaust residual gas in the air path system, and then the throttle valve (12) and the stop valve II (13) are closed; then closing the pressure regulating valve (19) and the oil return back pressure valve (27), and finally closing the constant delivery pump (14);
The dynamic characteristic test method comprises the following specific steps:
C1: before the test, confirming that a pressure regulating valve (19), a stop valve III (28), a sampling switch (29) and an oil return back pressure valve (27) in the oil circuit system are all in a closed state; confirming that a stop valve I (1), a stop valve II (13) and a throttle valve (12) in the gas circuit system are in a closed state;
c2: opening a constant delivery pump (14), a pressure regulating valve (19) and a stop valve III (28) to enable the pressure of a liquid inlet pipeline (B1) of the oil circuit system to reach a set pressure value;
and C3: the air source is connected, the stop valve I (1) and the throttle valve (12) are opened, the pressure reducing valve (2) is regulated to enable the air path pressure of the air inlet pipeline (A1) to reach a set value, and the pressure of the liquid inlet pipeline (B1) of the oil path system is higher than the air path pressure of the air inlet pipeline (A1) by at least 2MPa;
And C4: the control system adjusts the current of the servo valve from the minimum value to the maximum value, meanwhile, the tested valve (34) transmits a 0-bit displacement signal and a maximum-bit displacement signal to the controller through a piston of the tested valve (34) by a displacement sensor, and the control system analyzes the time t1 required from 0 bit to the maximum bit; then the control system adjusts the current of the servo valve from the maximum value to the minimum value, and meanwhile, the tested valve (34) is provided with a displacement sensor to transmit a maximum displacement signal and a 0-bit displacement signal to the controller through a piston of the tested valve (34), and the control system analyzes the time t2 required from the maximum position to the 0-bit;
c5: judging whether the tested valve (34) is qualified or not according to whether t1 and t2 in the step are in an error range or not;
C6: after the test is finished, the air source is disconnected, the stop valve I (1) is closed, the stop valve II (13) is opened to exhaust residual gas in the air path system, and then the throttle valve (12) and the stop valve II (13) are closed; then closing the pressure regulating valve (19) and the oil return back pressure valve (27), and finally closing the constant delivery pump (14);
the total pressure recovery coefficient testing method comprises the following specific steps:
D1: before the test, confirming that a pressure regulating valve (19), a stop valve III (28) and a sampling switch (29) in the oil circuit system are in a closed state; confirming that a stop valve I (1), a stop valve II (13) and a throttle valve (12) in the gas circuit system are in a closed state;
D2: opening a constant delivery pump (14) and a pressure regulating valve (19) to enable the pressure of a liquid inlet pipeline (B1) of the oil circuit system to reach a set pressure value; the oil return back pressure valve (27) is regulated to enable the pressure of a liquid outlet pipeline (B2) of the oil way system to reach a required pressed value;
D3: the air source is connected, the stop valve I (1) and the throttle valve (12) are opened, the pressure reducing valve (2) is regulated to enable the air path pressure of the air inlet pipeline (A1) to reach a set value, and the pressure of the liquid inlet pipeline (B1) of the oil path system is higher than the air path pressure of the air inlet pipeline (A1) by at least 2MPa;
D4: after the test data of the gas flowmeter on the air inlet pipeline (A1) is stable, slowly closing the throttle valve (12); in the closing process of the throttle valve (12), the air inlet pressure test piece and the air outlet pressure test piece record the air inlet pressure P1 of the tested valve and the air outlet pressure P2 of the tested valve at different moments respectively, and signal information of the P1 and the P2 is transmitted to a control system;
d5: the control system processes the inlet pressure P1 of the tested valve and the outlet pressure P2 of the tested valve, and judges whether the tested valve (34) is qualified or not according to whether the value of P2/P1 is in an error range or not;
D6: after the test is finished, the air source is disconnected, the stop valve I (1) is closed, the stop valve II (13) is opened to exhaust residual gas in the air path system, and then the throttle valve (12) and the stop valve II (13) are closed; then closing the pressure regulating valve (19) and the oil return back pressure valve (27), and finally closing the constant delivery pump (14).
2. The method for testing the valve testing system integrating large flow regulation and cutoff according to claim 1, wherein the method comprises the following steps: an air inlet pipeline (A1) between the pressure reducing valve (2) and the air flowmeter (5) is provided with an air filter (4) and a pressure gauge I (3); a temperature sensor I (8) is arranged on an air inlet pipeline (A1) between the air inlet pressure test piece and the tested valve (34); a temperature sensor II (11) is arranged on an air outlet pipeline (A2) between the air outlet pressure test piece and the throttle valve (12).
3. The test method of the large-flow-rate adjustment and cutoff integrated valve test system according to claim 1 or 2, wherein: the air inlet pressure test piece comprises an air inlet pressure gauge (7) and a pressure transmitter I (6), wherein the pressure transmitter I (6) is connected to a pipeline between the air inlet pressure gauge (7) and an air inlet pipeline (A1).
4. The method for testing the valve testing system integrating large flow regulation and cutoff according to claim 3, wherein: the air outlet pressure test piece comprises an air outlet pressure gauge (10) and a pressure transmitter II (9), and the pressure transmitter II (9) is connected to a pipeline between the air outlet pressure gauge (10) and an air outlet pipeline (A2).
5. The test method of the large-flow-rate adjustment and cutoff integrated valve test system according to claim 1,2 or 4, wherein: the liquid inlet end of the liquid inlet pipeline (B1) and the liquid outlet end of the liquid outlet pipeline (B2) are communicated with an oil tank (35), a liquid level meter (32) is arranged on the oil tank (35), and an oil drain switch (33) is arranged at the bottom of the oil tank (35).
6. The method for testing the valve testing system integrating high flow rate regulation and cutoff according to claim 5, wherein: a one-way valve (15), a liquid filter (16) and a safety valve (18) are arranged on a liquid inlet pipeline (B1) between the pressure regulating valve (19) and the first precise oil filter (20), and the safety valve (18) is arranged in parallel with the pressure regulating valve (19); a pressure gauge II (17) is also arranged on the liquid inlet pipeline (B1); a liquid flowmeter (25) and a pressure gauge III (26) are arranged on a liquid outlet pipeline (B2) between the liquid outlet pressure test piece and the oil return back pressure valve (27).
7. The method for testing the valve testing system integrating high flow rate regulation and cutoff according to claim 6, wherein: the feed liquid pressure testing piece comprises a feed liquid pressure meter (22) and a pressure transmitter III (21), and the pressure transmitter III (21) is connected to a pipeline between the feed liquid pressure meter (22) and a feed liquid pipeline (B1); the liquid outlet pressure test piece comprises a liquid outlet pressure gauge (24) and a pressure transmitter IV (23), and the pressure transmitter IV (23) is connected to a pipeline between the liquid outlet pressure gauge (24) and a liquid outlet pipeline (B2).
8. The test method of the large-flow-rate adjustment and cutoff integrated valve test system according to claim 1 or 2 or 4 or 6 or 7, wherein: an explosion-proof motor is connected to the constant displacement pump (14); the tested valve (34) is provided with a displacement sensor and a servo valve, and the displacement sensor and the servo valve are connected with a control system.
9. The method for testing the valve testing system integrating large flow regulation and cutoff according to claim 1, wherein the method comprises the following steps: during the process of steps S4, C4 and D4, the pressure of the liquid inlet pipeline (B1) of the oil circuit system is always at least 2MPa higher than the gas circuit pressure of the air inlet pipeline (A1).
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| CA2770214A1 (en) * | 2009-08-11 | 2011-02-17 | Cidra Corporate Services Inc. | Performance monitoring of individual hydrocyclones using sonar-based slurry flow measurement |
| CN104897386A (en) * | 2015-06-09 | 2015-09-09 | 哈尔滨工程大学 | Performance testing system of oil-gas multiphase pump |
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| RU2693053C1 (en) * | 2018-11-22 | 2019-07-01 | Федеральное автономное учреждение "25 Государственный научно-исследовательский институт химмотологии Министерства обороны Российской Федерации" | Apparatus for testing hydraulic fluids |
| CN114593985A (en) * | 2022-02-23 | 2022-06-07 | 西安航天发动机有限公司 | Gas cylinder superhigh pressure hydraulic test system |
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| CA2770214A1 (en) * | 2009-08-11 | 2011-02-17 | Cidra Corporate Services Inc. | Performance monitoring of individual hydrocyclones using sonar-based slurry flow measurement |
| CN104897386A (en) * | 2015-06-09 | 2015-09-09 | 哈尔滨工程大学 | Performance testing system of oil-gas multiphase pump |
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