CN108506279B - A kind of high-pressure pneumatic servo valve mass flow characteristic detecting apparatus and method - Google Patents
A kind of high-pressure pneumatic servo valve mass flow characteristic detecting apparatus and method Download PDFInfo
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- CN108506279B CN108506279B CN201810252686.1A CN201810252686A CN108506279B CN 108506279 B CN108506279 B CN 108506279B CN 201810252686 A CN201810252686 A CN 201810252686A CN 108506279 B CN108506279 B CN 108506279B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
- F15B19/007—Simulation or modelling
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Abstract
The invention discloses a kind of high-pressure pneumatic servo valve mass flow characteristic detecting apparatus and its measuring methods, belong to pneumatics field.Measuring method is based on valve port series connection bridge velocity of sound venting principleand and four-side valve port matching relationship, designs inner air path channel, two series connection valve ports of servo valve are equivalent to the equal series connection restriction of cross-sectional flow area.The variation of two series valve gas circulation sequences is realized by changing gas circuit direction, it makes full use of and flows through the two series valve gas principles of mass conservation, degassing method is stopped using constant volume, gas pressure change and steady temperature in constant volume cavity are measured respectively, the effective cross-sectional flow area and critical pressure ratio for obtaining high-pressure pneumatic servo valve are calculated, to accurately describe high-pressure pneumatic servo valve mass flow characteristic.Measurement device is for realizing measuring method as above.The method of the present invention and device eliminate dependence of the high-pressure pneumatic servo valve to high pressure gas mass flowmenter, and structure is simple, at low cost, accuracy is high, high-efficient.
Description
Technical field
The invention belongs to pneumatics field, it is related to a kind of high-pressure pneumatic servo valve mass flow characteristic detecting apparatus and survey
Determine method.
Background technique
Pneumatics has that low cost, clean energy is pollution-free, easy to operate etc. excellent because its working media is compressed air
Point is widely used in the every field of modern industry.Compared to low-pressure pneumatics, high-pressure pneumatics is conducive to element
Therefore the miniaturization of structure and executing agency's high speed become the research heat in current Fluid Transmission and Control field both at home and abroad
One of point.
It is external because of secrecy and technology since high-pressure pneumatic servo control technique can be applied to national defense industry high-technology field
Block reason is rarely reported.High-pressure pneumatic servo valve is the core component of high-pressure pneumatic servo-system, and mass flow characteristic is
Servo System Design, analysis, control basis, become high-pressure pneumatic servo-system research and technology development bottleneck.
Currently, having some pneumatic component flowrate property measurement methods.Sonic flow is used in international standard ISO/DP6358 proposition
The negotiability that pneumatic element is indicated with critical pressure ratio is led, but the experimental method that the draft is formulated is to experimental provision and tester
The required precision of device is harsher, and testing cost is high, and air consumption is too big, is unfavorable for energy conservation and cost angle.
In addition, Japanese scholars propose isothermal cavity degassing method, eliminate to a certain extent temperature to element flow characteristic and
The influence of inflation/deflation characteristic, but testing cost is higher, difficulty is larger, and the requirement to experimental provision and test equipment is harsh, and by
It is realized in the evaluation inconvenience of its isothermal performance, gas in container variation is difficult to be equivalent to ideal isothermal mistake during actual test
Journey.
Therefore, it needs to develop a kind of suitable for high-pressure pneumatic servo valve and high-efficient mass flow characteristic measurement at low cost
Method and test device.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides a kind of high-pressure pneumatic servo valve quality streams
Flow characteristic measurement device and method eliminate the dependence to high pressure gas mass flowmenter, and test device structure is simple, measures
At low cost, its corresponding test method accuracy is high, high-efficient and environmental protection and energy saving.
To achieve the above object, according to one aspect of the present invention, a kind of high-pressure pneumatic servo valve mass flow is provided
Characteristic detecting apparatus, the device are based on valve port series connection bridge velocity of sound venting principleand, design inner air path channel, pass through and change gas circuit
Direction measures the effective sectional area and critical pressure ratio of high-pressure pneumatic servo valve, realizes that high-pressure pneumatic servo valve mass flow is special
Property efficiently, precise measurement.The device specifically includes high-pressure air source, water-separating gas filter, pressure reducing valve, bleed pressure table, oil sprayer, electricity
Magnetic switch valve, constant volume cavity, chamber pressure sensor, cavity temperature sensor, electromagnetic switch valve, displacement sensor, driving
Device, controller, A/D module and computer.The high-pressure air source, water-separating gas filter, pressure reducing valve, bleed pressure table, mist of oil
Device, the first electromagnetic switch valve are connected with constant volume cavity first port again after being sequentially connected in series, chamber pressure sensor and cavity temperature
Degree sensor is connect with constant volume cavity respectively, with the pressure and temperature for measuring constant volume cavity, constant volume cavity second
Port is connected to the second electromagnetic switch valve, and the second electromagnetic switch valve is also connected with the different ventilations of tested high-pressure pneumatic servo valve simultaneously
Mouthful, there are five blow vents for high-pressure pneumatic servo valve tool, and five blow vents are respectively E1Mouth, A mouthfuls, P mouthfuls, B mouthfuls, E2Mouthful.High-pressure pneumatic
Spool one end of servo valve is provided with displacement sensor, and for measuring the displacement of spool, the spool of high-pressure pneumatic servo valve is another
End is provided with driving device, and for driving spool mobile and then changing valve port opening, controller connects driving device, for controlling
Driving device processed is according to set requirements or order-driven spool, A/D module connect displacement sensor and computer simultaneously, control
Device processed connects driving device and computer simultaneously.It is opened by the valve port that controller controls driving device change high-pressure pneumatic servo valve
Degree, displacement sensor and A/D module obtain the spool displacement of high-pressure pneumatic servo valve, by computer acquisition corresponding data.
The second aspect according to the invention also provides a kind of high-pressure pneumatic servo valve mass flow characteristic measurement method,
In high-pressure pneumatic servo valve mass flow characteristic measurement method of the invention, the high-pressure pneumatic servo valve is direct-drive type three five
Logical servo valve has there are four working edge, using four-side valve port matching relationship and bridge principle, designs inner air path channel,
Servo valve two series connection valve ports can be equivalent to the equal series connection restriction of cross-sectional flow area, make full use of and flow through two series connection valve ports
Gaseous mass conservation principle, connected bridge velocity of sound venting principleand based on valve port, change gas circuit direction, by pressure sensor and
Temperature sensor measures gas pressure change situation and steady temperature in constant volume cavity respectively, obtains high pressure gas under fluidised form of being jammed
The effective sectional area and critical pressure ratio of dynamic servo valve, according to international standard ISO6358 about mass flow curve ellipse hypothesis,
High-pressure pneumatic servo valve mass flow characteristic can be accurately described, the dependence to high pressure gas mass flowmenter is thereby eliminated,
Realize the efficient, precise measurement to high-pressure pneumatic servo valve mass flow characteristic.
Specifically, when executing high-pressure pneumatic servo valve mass flow characteristic measurement method, firstly, measuring the high-pressure pneumatic
The effective sectional area S value of each valve port of servo valve, then series connection valve port measures critical pressure ratio respectively.
When spool moves to left, P mouthfuls connect with constant volume cavity, and A mouthfuls of straight-through atmosphere measure and servo valve valve port is calculated
R3Effective sectional area；When spool moves to right, E1Mouth is connect with constant volume cavity, and A mouthfuls of straight-through atmosphere are measured and are calculated and watch
Take valve valve port R4Effective sectional area.Due to A mouthfuls with B mouthfuls be it is identical, measure valve port R3And R4Valve port R can be obtained1With
R2Effective sectional area.
When spool moves to left, first by E2Mouth is connect with constant volume cavity, and B mouthfuls connect with P mouthfuls, A mouthfuls of straight-through atmosphere, can measure simultaneously
Valve port R is calculated1And R3Effective sectional area and valve port R when series connection3Critical pressure ratio；Change gas circuit direction, valve port R1With R3
P mouthfuls connect by change of direction with constant volume cavity, and A mouthfuls connect with E mouthfuls, B mouthfuls of straight-through atmosphere, can measure and valve port is calculated
R3And R1Effective sectional area and valve port R when series connection1Critical pressure ratio.
When spool moves to right, E1Mouth is connect with constant volume cavity, and A mouthfuls connect with E mouthfuls, and B mouthfuls of directly logical atmosphere can measure and count
Calculation obtains valve port R4And R2Effective sectional area and valve port R when series connection2Critical pressure ratio；Change gas circuit direction, valve port R2With R4It hands over
Direction is changed, P mouthfuls connect with constant volume cavity, and B mouthfuls connect with P mouthfuls, and A mouthfuls of directly logical atmosphere can measure and valve port R is calculated4
And R2Effective sectional area and valve port R when series connection4Critical pressure ratio.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect:
The present invention is based on series connection bridge velocity of sound venting principleand and four-side valve port matching relationships, by changing gas circuit direction
Establish the identical restriction of two effective sectional areas, by measure be jammed under fluidised form the effective sectional area of high-pressure pneumatic servo valve and
Critical pressure ratio, indirect measuring flow value realize the efficient, precise measurement to high-pressure pneumatic servo valve mass flow characteristic.The survey
Amount method and apparatus structure is simple, measurement cost is low, high-efficient, energy saving and measurement is accurate.The method of the present invention and device are suitable for
High-pressure pneumatic servo techniques.
Detailed description of the invention
Fig. 1 is that the structure of direct-drive type 3 position-5 way high-pressure pneumatic servo valve mass flow characteristic measuring device of the invention is former
Reason figure；
Fig. 2 is that the equivalent bridge schematic illustration of independent valve port effective sectional area system is measured in the method for the present invention；Such as Fig. 2
(a) shown in, for the schematic illustration when spool moves to left；As shown in Fig. 2 (b), for the schematic illustration when spool moves to right；
Fig. 3 is valve port R in the method for the present invention1And R3Velocity of sound of connecting is vented the equivalent bridge schematic illustration of measuring system；
Fig. 4 is valve port R in the method for the present invention2And R4Velocity of sound of connecting is vented the equivalent bridge schematic illustration of measuring system；
Wherein, identical appended drawing reference indicates identical components or structure from beginning to end, specifically:
1, high-pressure air source, 2, water-separating gas filter, 3, pressure reducing valve, 4, bleed pressure table, 5, oil sprayer, the 6, first electromagnetic switch
Valve, 7, constant volume cavity, 8, chamber pressure sensor, 9, cavity temperature sensor, the 10, second electromagnetic switch valve, 11, high pressure gas
Dynamic servo valve, 12, displacement sensor, 13, driving device, 14, controller, 15, A/D module, 16, computer.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
The invention discloses a kind of high-pressure pneumatic servo valve mass flow characteristic measurement method and devices.Electric approach principle
It is: based on valve port series connection bridge velocity of sound venting principleand and four-side valve port matching relationship, inner air path channel is designed, by servo
Two series connection valve ports of valve are equivalent to the equal series connection restriction of cross-sectional flow area.Two series valves are realized by changing gas circuit direction
The variation of gas circulation sequence makes full use of and flows through the two series valve gas principles of mass conservation, stops arranging using constant volume
Gas method measures gas pressure change and steady temperature in constant volume cavity by pressure sensor and temperature sensor respectively, warp
Theory deduction calculates the effective cross-sectional flow area and critical pressure ratio for obtaining high-pressure pneumatic servo valve, to accurately describe high pressure gas
Dynamic servo valve mass flow characteristic.
In order to prove the correctness of the method for the present invention and device in principle, it is described below as follows:
There are four working edges for direct-drive type 3 position-5 way high-pressure pneumatic servo valve tool, and servo valve valve port is equivalent to variable restrictor
Mouthful, according to international standard ISO6358 about by mass flow equation form be equivalent to elliptic equation it is assumed that flowing through each valve port
Gas mass flow can by formula (1), (2) indicate:
In formula, AeThe effective flow area of servo valve rectangle valve port, Ae=4Cdbxv, (CdFor servo valve discharge coefficient, b is valve
Cover rectangular window width, xvFor spool displacement)；
QmmaxMaximum gas mass flow；
QmGas mass flow；
p1Valve port upstream pressure；
p2Valve port downstream pressure；
σ-valve port pressure ratio, σ=p2/p1；
K- adiabatic constant, k=1.4；
R- ideal gas constant, R=287J/kgK；
T1Upstream gas temperature；
σcrCritical pressure ratio；
By formula (1), (2) it is found that using the effective sectional area A under fluidised form of being jammedeWith critical pressure ratio σcrTwo feature ginsengs
Number can be with the mass flow characteristic of expressed intact high-pressure pneumatic servo valve.
Based on velocity of sound degassing method, gas pressure in constant volume cavity is measured by pressure sensor and temperature sensor respectively
Variation and steady temperature comprehensively consider insulation exhaust process and constant volume process thermodynamical equilibrium equation, gas dynamic equation, can be by formula
(3) the effective sectional area S of each valve port is obtained:
Wherein, the volume of V- constant volume cavity；
T- deflation time；
T0Constant volume cavity homeostasis temperature；
p10Constant volume cavity initial pressure；
p∞Constant volume chamber pressure stationary value after deflation.
Four-side valve port matching properties are made full use of, based on valve port series connection bridge velocity of sound venting principleand and four-side valve
Mouth matching relationship, designs inner air path channel, two series connection valve ports of servo valve is equivalent to the equal series connection of cross-sectional flow area
Restriction, the equivalent bridge principle of measuring system are as shown in Figure 3.Valve port R1With R3Before exchange sequence, when valve core of servo valve is moved to the left
When, E mouthfuls of servo valve connect with constant volume cavity, and B mouthfuls connect with P mouthfuls, A mouthfuls of directly logical atmosphere.
Valve port R1With R3After sequence exchanges, changing gas circuit direction, P mouthfuls connect with constant volume cavity, and A mouthfuls connect with E mouthfuls, and B mouthfuls
Directly logical atmosphere.
Thus the critical pressure ratio of high-pressure pneumatic servo valve valve port under fluidised form of being jammed, gained valve port R be can get3Critical pressure
Compare σ1crIt can be indicated by formula (4):
Wherein, S12Equivalent cross-sectional area after valve port 1 and valve port 2 are connected；
S1The equivalent flow area of valve port 1；
S2The equivalent flow area of valve port 2；
Gained valve port R1Critical pressure ratio can be indicated by formula (5):
Wherein, S21Equivalent cross-sectional area after valve port 2 and valve port 1 are connected；
So as to obtain flow value indirectly, the dependence to flowmeter is thus reduced, is realized to high-pressure pneumatic servo valve matter
Measure discharge characteristic efficiently, precise measurement.
Fig. 1 is that the structure of direct-drive type 3 position-5 way high-pressure pneumatic servo valve mass flow characteristic measuring device of the invention is former
Reason figure, as seen from the figure, high-pressure pneumatic servo valve mass flow characteristic detecting apparatus divides water to filter as shown in Figure 1, including high-pressure air source
Gas device, pressure reducing valve, bleed pressure table, oil sprayer, constant volume cavity, chamber pressure sensor, cavity temperature sensor, electromagnetism are opened
Close valve, displacement sensor, driving device, controller and A/D module and computer.The high-pressure air source 1, water-separating gas filter
2, pressure reducing valve 3, bleed pressure table 4, oil sprayer 5, the first electromagnetic switch valve 6 be sequentially connected in series after again with 7 first end of constant volume cavity
Mouth series connection, chamber pressure sensor 8 and cavity temperature sensor 9 are respectively used to the pressure and temperature of measurement constant volume cavity 7, fixed
7 second port of volume cavity is connected to the second electromagnetic switch valve 10, and the second electromagnetic switch valve 10 is also connected with tested high-pressure pneumatic simultaneously
Servo valve 11 different blow vents (tool of high-pressure pneumatic servo valve 11 there are five blow vent, five blow vents be respectively E1, A, P, B,
E2), driving device 13 is controlled by controller 14 and changes the valve port opening of high-pressure pneumatic servo valve 11 (specifically, passing through adjusting
Or change the displacement of spool, and to adjust valve port opening), displacement sensor 12 and A/D module 15 obtain high-pressure pneumatic servo
The spool displacement of valve acquires data by computer 16.
Fig. 2 is that the equivalent bridge schematic illustration of independent valve port effective sectional area system, such as Fig. 2 are measured in the method for the present invention
(a) shown in, when spool moves to left, P mouthfuls connect with constant volume cavity 7, and A mouthfuls of straight-through atmosphere measure and servo valve valve is calculated
The effective sectional area S1 of mouth R3 (specially gas flow to the A mouthfuls of restrictions formed by P mouthfuls)；As shown in Fig. 2 (b), when the spool right side
When shifting, E1 mouthfuls connect with constant volume cavity 7, A mouthfuls of straight-through atmosphere, measure and servo valve valve port R4 (specially gas is calculated
Flow to the A mouthfuls of restrictions formed by E1 mouthfuls) effective sectional area S2.Due to A mouthfuls with B mouthfuls be it is identical, measure valve port R3
The effective sectional area of valve port R1 and R2 can be obtained with R4.Wherein, R1 flow to the B mouthfuls of restrictions formed, R2 by E2 mouthfuls for gas
The B mouthfuls of restrictions formed are flow to by P mouthfuls for gas, R3 flow to the A mouthfuls of restrictions formed by P mouthfuls for gas, and R4 is gas by E1
Mouth flow to the restriction of A mouthfuls of formation.
Fig. 3 is valve port R1 and R3 series connection velocity of sound the exhaust equivalent bridge schematic illustration of measuring system in the method for the present invention, such as
Shown in Fig. 3, when spool moves to left, first connect 7 with constant volume cavity for E2 mouthfuls and connect, B mouthfuls connect with P mouthfuls, A mouthfuls of straight-through atmosphere, can measure
And valve port R1 (specially gas flow to the B mouthfuls of restrictions formed by E2 mouthfuls) and R3 is calculated (specially gas is flow to by P mouthfuls
A mouthfuls formation restrictions) series connection when effective sectional area S12 and valve port R3 critical pressure ratio；Change gas circuit direction, valve port R1 with
P mouthfuls connect by R3 change of direction with constant volume cavity 7, and A mouthfuls connect with E mouthfuls, B mouthfuls of straight-through atmosphere, can measure and valve is calculated
Effective sectional area S21 and valve port R1 critical pressure ratio when mouth R3 and R1 connects.
Fig. 4 is valve port R2 and R4 series connection velocity of sound the exhaust equivalent bridge schematic illustration of measuring system in the method for the present invention, such as
Shown in Fig. 4, when spool moves to right, E1 mouthfuls connect with constant volume cavity 7, and A mouthfuls connect with E mouthfuls, and B mouthfuls of directly logical atmosphere can measure simultaneously
Valve port R4 (specially gas flow to the A mouthfuls of restrictions formed by E1 mouthfuls) and R2 is calculated, and (specially gas flow to B by P mouthfuls
Mouthful formed restriction) series connection when effective sectional area S12 and valve port R2 critical pressure ratio；Change gas circuit direction, valve port R2 with
R4 change of direction, P mouthfuls connect with constant volume cavity 7, and B mouthfuls connect with P mouthfuls, and A mouthfuls of directly logical atmosphere can measure and valve is calculated
Effective sectional area S21 and valve port R4 critical pressure ratio when mouth R4 and R2 connects.
Ignore the friction heat exchange of air-flow and tube wall, and cavity evacuation time is as short as possible, guarantees and external environment is handed over without heat
It changes, i.e. the exhaust of realization constant entropy velocity of sound.Two valve port series connection, flow area is consistent or difference is smaller, guarantees high pressure gas first
It is subsonic speed in a valve port runner, and is velocity of sound in second valve port runner, i.e., critical cross-section is at second valve port.Pass through
The effective sectional area and critical pressure ratio for measuring high-pressure pneumatic servo valve under fluidised form of being jammed, to measure high-pressure pneumatic servo valve matter
Measure discharge characteristic.
The method for carrying out high-pressure pneumatic servo valve mass flow characteristic measurement using apparatus of the present invention is as follows:
Firstly, tested high-pressure pneumatic servo valve valve port is connected in this test device, operation data collecting work, start
High-pressure air source sets up and holds intracavity gas initial pressure for pl0, gas temperature angle value in cavity after record pressure is stablized；
High-pressure pneumatic servo valve is opened into setting aperture, air escape cock valve is opened, is accurately controlled by signal generator
Deflation time, when holding intracavity gas closing air escape cock valve after tested valve port exhaust 2s, stop deflating (obtains through many experiments
Out: holding intracavity gas in 2s in deflation course can ignore with external heat exchange, it is believed that be insulation exhaust process, greater than after 2s with
Insulation has error, and extends error with deflation time and increase)；
Gaseous state variation satisfaction etc. holds law in cavity after stopping is deflated, through experimental results demonstrate each to stop deflating
Hold intracavity gas afterwards and the abundant heat-exchange time of external environment is at least 2 minutes, final pressure reaches stationary value p1∝；
After being completed then by formula (3), (4), (5) can calculate each tested valve port S value and σcrValue,
The mass flow characteristic of high-pressure pneumatic servo valve is obtained finally by formula (1), (2).
The method of the present invention eliminates the dependence to high pressure gas mass flowmenter, and test method and device have structure letter
Singly, the features such as measurement cost is low, accuracy is high, high-efficient and energy saving.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (6)
1. a kind of high-pressure pneumatic servo valve mass flow characteristic detecting apparatus, which is characterized in that it includes high-pressure air source (1), point
Water air filter (2), pressure reducing valve (3), bleed pressure table (4), oil sprayer (5), the first electromagnetic switch valve (6), constant volume cavity
(7), chamber pressure sensor (8), cavity temperature sensor (9), the second electromagnetic switch valve (10), displacement sensor (12) drive
Dynamic device (13), controller (14), A/D module (15) and computer (16), wherein
The high-pressure air source (1), water-separating gas filter (2), pressure reducing valve (3), bleed pressure table (4), oil sprayer (5), the first electromagnetism
Switch valve (6) is connected with constant volume cavity (7) first port again after being sequentially connected in series, chamber pressure sensor (8) and cavity temperature
Sensor (9) is connect with constant volume cavity (7) respectively, to be used to measure the pressure and temperature of constant volume cavity (7),
Constant volume cavity (7) second port is connected to the second electromagnetic switch valve (10), and the second electromagnetic switch valve (10) is also connected with simultaneously
The different blow vents of tested high-pressure pneumatic servo valve (11), spool one end of high-pressure pneumatic servo valve (11) is provided with displacement sensing
Device (12), for measuring the displacement of spool,
The spool other end of high-pressure pneumatic servo valve (11) is provided with driving device (13), for driving spool mobile and then changing
Valve port opening, controller (14) connect driving device (13) and computer (16) simultaneously, to press for controlling driving device (13)
Requirement or order-driven spool according to setting, A/D module (15) connect displacement sensor (12) and computer (16) simultaneously.
2. a kind of high-pressure pneumatic servo valve mass flow characteristic detecting apparatus as described in claim 1, which is characterized in that work
When, change the valve port opening of high-pressure pneumatic servo valve (11), displacement sensor by controller (14) control driving device (13)
(12) and A/D module (15) collective effect is to obtain the spool displacement of high-pressure pneumatic servo valve, by computer (16) acquisition valve
The corresponding data of core displacement.
3. a kind of using the side for carrying out high-pressure pneumatic servo valve mass flow characteristic measurement such as one of claim 1-2 described device
Method, which is characterized in that it includes the following steps:
S1: measuring the effective sectional area of each valve port of high-pressure pneumatic servo valve to be measured,
S2: and then critical pressure ratio is measured after valve port of connecting respectively,
S3: the quality stream for obtaining high-pressure pneumatic servo valve to be measured is calculated according to the effective sectional area of each valve port and critical pressure ratio
Flow characteristic.
4. method as claimed in claim 3, which is characterized in that in step S1, high-pressure pneumatic servo valve tool is there are five valve port, and five
A valve port is respectively E1, A, P, B, E2, and the effective sectional area for measuring each valve port of high-pressure pneumatic servo valve to be measured is specific as follows:
When spool moves to left, P mouthfuls connect with constant volume cavity, A mouthfuls of straight-through atmosphere, measure and servo valve valve port R is calculated3's
Effective sectional area, when spool moves to right, E1Mouth is connect with constant volume cavity, and A mouthfuls of straight-through atmosphere measure and servo valve is calculated
Valve port R4Effective sectional area, A mouthfuls with B mouthful under the same conditions, measurement valve port R3And R4Effective sectional area can directly obtain valve
Mouth R1And R2Effective sectional area,
Wherein, R1 flow to the B mouthfuls of restrictions formed by E2 mouthfuls for gas, and R2 flow to the B mouthfuls of restrictions formed by P mouthfuls for gas,
R3 flow to the A mouthfuls of restrictions formed by P mouthfuls for gas, and R4 flow to the A mouthfuls of restrictions formed by E1 mouthfuls for gas.
5. method as claimed in claim 4, which is characterized in that step S2 specifically:
Spool is moved to left, E2Mouth is connect with constant volume cavity, and B mouthfuls connect with P mouthfuls, A mouthfuls of straight-through atmosphere, be can measure and is calculated
Valve port R1And R3Effective sectional area and valve port R when series connection3Critical pressure ratio；
Change gas circuit direction, valve port R1With R3P mouthfuls connect by change of direction with constant volume cavity, and A mouthfuls connect with E mouthfuls, and B mouthfuls straight-through
Atmosphere can measure and valve port R is calculated3And R1Effective sectional area and valve port R when series connection1Critical pressure ratio,
When spool is moved to right, E1Mouth is connect with constant volume cavity, and A mouthfuls connect with E mouthfuls, and B mouthfuls of directly logical atmosphere can measure and calculate
Obtain valve port R4And R2Effective sectional area and valve port R when series connection2Critical pressure ratio；
Change gas circuit direction, valve port R2With R4Change of direction, P mouthfuls connect with constant volume cavity, and B mouthfuls connect with P mouthfuls, and A mouthfuls directly logical
Atmosphere can measure and valve port R is calculated4And R2Effective sectional area and valve port R when series connection4Critical pressure ratio.
6. method as claimed in claim 5, which is characterized in that step S2 further includes following process:
Firstly, tested high-pressure pneumatic servo valve valve port is connected in measurement device, measurement device is opened, spool displacement is run
Data collection task starts high-pressure air source, and setting up constant volume to hold intracavity gas initial pressure is pl0, and record pressure is fixed after stablizing
Gas temperature angle value and pressure value in volume cavity；
High-pressure pneumatic servo valve is opened into setting aperture, constant volume cavity air escape cock valve is opened, accurately controls deflation time,
When constant volume holds intracavity gas after tested valve port exhaust 2s, closing air escape cock valve stops deflating；
Stop after deflating gaseous state variation in constant volume cavity and meet etc. to hold law, stop holding after deflating every time intracavity gas with
The abundant heat-exchange time of external environment is at least 2 minutes, and final pressure reaches stationary value, and after pressure reaches stationary value, measurement is faced
The effective sectional area of boundary's pressure ratio and each valve port.
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| US5767389A (en) * | 1995-07-26 | 1998-06-16 | Automotive Products (Usa), Inc. | Method and apparatus for testing a fluid pressure apparatus |
| CN105402454A (en) * | 2015-08-21 | 2016-03-16 | 中国人民解放军国防科学技术大学 | Gas supply adjustment device based on pressure reducers |
| CN107165892A (en) * | 2017-06-14 | 2017-09-15 | 武汉科技大学 | A kind of sliding-mode control of electrohydraulic servo system |
| CN107830011A (en) * | 2017-09-30 | 2018-03-23 | 潍柴动力股份有限公司 | The method and system of valve port area test are carried out based on excavator complete machine |
-
2018
- 2018-03-26 CN CN201810252686.1A patent/CN108506279B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5767389A (en) * | 1995-07-26 | 1998-06-16 | Automotive Products (Usa), Inc. | Method and apparatus for testing a fluid pressure apparatus |
| CN105402454A (en) * | 2015-08-21 | 2016-03-16 | 中国人民解放军国防科学技术大学 | Gas supply adjustment device based on pressure reducers |
| CN107165892A (en) * | 2017-06-14 | 2017-09-15 | 武汉科技大学 | A kind of sliding-mode control of electrohydraulic servo system |
| CN107830011A (en) * | 2017-09-30 | 2018-03-23 | 潍柴动力股份有限公司 | The method and system of valve port area test are carried out based on excavator complete machine |
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