CN117472107A - Control method for balance working position of piston type pressure gauge - Google Patents
Control method for balance working position of piston type pressure gauge Download PDFInfo
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- CN117472107A CN117472107A CN202311801202.1A CN202311801202A CN117472107A CN 117472107 A CN117472107 A CN 117472107A CN 202311801202 A CN202311801202 A CN 202311801202A CN 117472107 A CN117472107 A CN 117472107A
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000006073 displacement reaction Methods 0.000 claims abstract description 52
- 238000012360 testing method Methods 0.000 claims abstract description 15
- 238000005259 measurement Methods 0.000 claims description 14
- 230000001276 controlling effect Effects 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000012795 verification Methods 0.000 claims description 3
- 238000013459 approach Methods 0.000 abstract description 3
- 230000007774 longterm Effects 0.000 description 6
- 238000009530 blood pressure measurement Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- VJHINFRRDQUWOJ-UHFFFAOYSA-N dioctyl sebacate Chemical compound CCCCC(CC)COC(=O)CCCCCCCCC(=O)OCC(CC)CCCC VJHINFRRDQUWOJ-UHFFFAOYSA-N 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/20—Control of fluid pressure characterised by the use of electric means
- G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
- G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
- G01L27/002—Calibrating, i.e. establishing true relation between transducer output value and value to be measured, zeroing, linearising or span error determination
- G01L27/005—Apparatus for calibrating pressure sensors
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- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention provides a control method for the balance working position of a piston type pressure gauge, which is characterized in that the original piston type pressure gauge is additionally provided with a displacement sensor, a controller, a standard pressure generator, an electromagnetic valve and other hardware, and after a piston system (standard end) and a detected end reach an initial balance state, the displacement sensor below the piston system can monitor whether the piston displacement range is in an allowable working displacement rangeh 0 ~h 1 In which the piston gradually descends to near heighth 0 When the pressure of the piston system is higher than the preset pressure, the controller temporarily cuts off the connecting channel between the standard end and the detected end by closing the electromagnetic valve, and properly compensates the pressure of the piston system by controlling the standard pressure generator until the pressure approaches to the preset pressureh 1 Stopping the pressure measuring device to ensure that the displacement range of the piston is always kept within the working displacement range, thereby achieving the purpose of long-time constant pressure test on the pressure measuring device at the detected end and further reducingAnd (5) manually operating.
Description
Technical Field
The invention belongs to the technical field of pressure gauge measurement and control, and particularly relates to a control method for a balance working position of a piston type pressure gauge.
Background
The piston pressure gauge is a pressure measurement standard instrument based on pascal law and hydrostatic balance principle, is widely used because of its high accuracy and excellent long-term stability, and can be used for measuring and testing the measured instrument by equalizing the pressures of the standard piston and the measured instrument in an operating state, and can be used for calibrating and calibrating pressure gauges, digital pressure gauges, pressure transmitters and other pressure measurement instruments.
However, according to the design principle of the piston type pressure gauge, a micron-sized gap exists between the piston rod and the piston cylinder; under the working condition, working medium can gradually leak out of a gap of a piston system, the piston is inevitably lowered at a certain speed (the allowable lowering speed of a piston pressure gauge within 500MPa is 0.15 mm/min-1.5 mm/min according to different measuring ranges and accuracy grades), and although a certain allowable displacement range exists in the working position, if a long-term constant pressure test is carried out (namely, when two pressure values of a standard end and a detected port are kept in an equal pressure balance state for a long time), the pressure regulator is required to be continuously operated to adjust the volume of a cavity of the calibrator so as to improve the displacement of the piston system and keep the piston system in the working position, so that the whole system keeps pressure balance. The whole process needs to be monitored manually, and the height position of the piston system is continuously adjusted to be within the allowable displacement range by using the pressure regulator, and the manual pressurization causes the problem of inconvenient operation and the possibility that the piston system is easy to fall out of the working position range; meanwhile, the fact that the voltage regulator has the limit working range is considered, so that in the process of constant voltage test, the whole checking system cannot keep constant voltage after the voltage regulator reaches the limit working position is possible.
Based on the above, there is a great need to design a control method for the balance working position of the piston type pressure gauge, which reduces the manual pressure regulating workload during manual monitoring and ensures that the piston is always in the working position range when a long-term constant pressure test is performed, so that the whole system keeps pressure balance.
Disclosure of Invention
The invention provides a control method for a balance working position of a piston type pressure gauge, which is used for solving the problems that the operation is inconvenient and the piston system is easy to fall out of a working position range because manual repeated pressurization is needed in the process of keeping the pressure balance state of the whole system for a long time.
The invention discloses a control method for the balance working position of a piston type pressure gauge, a displacement sensor, a controller, a standard pressure generator and an electromagnetic valve are arranged on a balance system of the piston type pressure gauge, the controller is respectively connected with the displacement sensor, the standard pressure generator and the electromagnetic valve in a signal manner, the displacement sensor is arranged below the piston system, the output end of the standard pressure generator is connected with a hydraulic circuit, the electromagnetic valve is arranged on the hydraulic circuit between the output end of the standard pressure generator and a tested port, and when the piston system is in a balance state, the pressures of the standard and the tested port are allpThe controller is capable of performing the following steps:
step 1: initializing, setting the displacement range of the working position of the piston system ash 0 ~h 1 The solenoid valve is controlled to be in an open state and the standard pressure generator is controlled to be in a closed control mode,h 0 for the displacement of the lowest point of the working position,h 1 is the highest point displacement of the working position;
step 2: when the displacement sensor detects that the working position of the piston system ish 0 +ΔhWhen the standard pressure generator is controlled to start the control mode and the electromagnetic valve is closed, deltahIs a positive constant;
step 3: the standard pressure generator is slightly larger thanpPressure of valuep+ΔpPressure output control is performed to inject the working medium inside the standard pressure generator into the hydraulic circuit to raise the piston system, deltapIs a positive constant;
step 4: when the displacement sensor detects that the working position of the piston system ish 1 -ΔhWhen in use, control standard pressureThe force generator turns off the control mode and opens the solenoid valve.
Preferably, before performing steps 1-4, the piston manometer is required to be in an equilibrium working position; firstly, a measured instrument is arranged at a detected port on a piston type pressure gauge, a weight with corresponding pressure is arranged on a piston system, the piston at the standard end floats to a working position through the pre-pressing of a pre-pressing pump and the fine adjustment of a pressure regulating pump, the piston rotates at the speed of (20-40) r/min, and the pressure of a verification system ispAnd after a period of time, step 1-4 is performed.
Preferably, the deltap1%p5%p, the deltah1mm to 3mm.
Preferably, step 1 further comprises setting the standard pressure generator in a measurement mode to measure the pressure of the hydraulic circuit.
Preferably, the displacement sensor is a laser displacement sensor.
Preferably, the working medium supplied through the inside of the standard pressure generator is identical to the piston system medium, in particular an oil medium.
Preferably, after the standard pressure generator is turned off in step 4, the standard pressure generator starts the measurement mode, in which the pressures of the piston system, standard pressure generator and port under test are maintained continuouslyp。
Preferably, the pressure control range and the measuring range of the standard pressure generator can cover the measuring range of the piston pressure meter, and the upper limit of the pressure control range and the measuring range of the standard pressure generator is more than or equal to 1.01 times of the upper limit of the measuring range of the piston pressure meter, and the accuracy grade of the piston pressure meter and the standard pressure generator is 0.05 grade or more.
Preferably, if the controller determines that the measured pressure of the standard pressure generator is greater than the preset threshold, such as greater than 1.1, when performing steps 1-4pAnd immediately stopping executing the steps 1-4 and exiting the program.
The control method of the balance working position of the piston type pressure gauge provided by the invention is a control method combining software and hardware improvement, and is used for carrying out long-term constant pressure testIf the test pressure duration of some tested instruments is as long as several hours or even tens of hours, and the piston descending speed of the 0.05-level piston type pressure gauge with the upper limit of the measuring range of 60MPa is about 1mm/min and the reference working position range is about 10mm, the piston descends to the lowest point of the working position about 10min after reaching the equilibrium state if the method is not usedh 0 The pressure regulator is required to raise the position of the piston, and the pressure regulation of the pressure regulator is required to be repeatedly carried out), so that the manual pressure regulation workload during manual monitoring is reduced, the piston is ensured to be always in a working position range, and the pressure balance of the whole system is kept. By adding the hardware such as the displacement sensor, the controller, the standard pressure generator, the electromagnetic valve and the like on the original piston type pressure gauge, when the piston at the standard end floats to the working position, the pressures at the standard end and the detected end reach balance (namely the pressure balance at the piston system and the detected port), and at the moment, the displacement sensor at the position below the piston system (standard end) with weights placed can monitor whether the displacement range of the piston is in the allowable working displacement rangeh 0 ~h 1 In which the piston gradually descends to near heighth 0 When the pressure of the standard end piston system is higher than the pressure of the standard end piston system, the controller cuts off the standard end and the detected end temporarily by closing the electromagnetic valve, and performs proper pressure compensation on the standard end piston system by controlling the standard pressure generator until the standard end piston system approaches to the detected endh 1 And then the piston type pressure gauge can quickly recover to a normal working state, and the piston displacement range is always kept in the working displacement range, so that the purpose of long-time constant pressure test on the tested instrument of the tested port is achieved, and the manual operation is reduced.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a control system for a balanced operating position of a piston pressure gauge provided by the present invention;
fig. 2 is a flow chart of the steps of the method for controlling the balance working position of the piston type pressure gauge.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Based on the technical problem that the prior art is not easy to find, namely that the volume of the cavity of the piston calibrator is required to be continuously adjusted by using a pressure regulator during long-term constant pressure test, so that the displacement of a piston system is improved to push the piston system to a working position, the invention designs a control system for balancing the working position of the piston pressure gauge based on the improvement of FIG. 1.
The control system for the balance working position of the piston type pressure gauge of the invention is described below with reference to fig. 1, in the control system shown in fig. 1, a piston system with a standard piston, a pressure regulator, an oil return valve, an oil cup, a pre-pressure pump, a hydraulic circuit and a detected port all belong to the original devices on the piston type pressure gauge, the piston system is connected with the detected port through the hydraulic circuit, one end of the pressure regulator and one end of the oil return valve are connected with the hydraulic circuit, and the other end of the oil return valve is connected with the pre-pressure pump through the oil cup.
In order to automatically pressurize and ensure that the piston is always in the working position range during long-term constant pressure measurement calibration test, the invention adds hardware such as a displacement sensor, a controller, a standard pressure generator, a solenoid valve and the like in fig. 1, wherein the connection and the position relation of the components are as follows: the controller is respectively connected with the displacement sensor, the standard pressure generator and the electromagnetic valve in a signal way, and the displacement sensor is arranged below the piston system, so that the relative position of the lifting piston is monitored; the output end of the standard pressure generator is connected with the hydraulic circuit so as to perform pressure compensation on the hydraulic circuit; the solenoid valve is provided on the hydraulic circuit between the output of the standard pressure generator and the port under test, so as to actively shut off the hydraulic circuit when necessary.
After the new hardware in fig. 1 is installed, the piston type pressure gauge is required to be in a balanced working position, specifically, firstly, a measured instrument is installed at a detected port on the piston type pressure gauge, a weight with corresponding pressure is installed on a piston of a piston system, the standard piston floats to the working position through pre-pressing of a pre-pressing pump and fine adjustment of a pressure regulating pump, and the standard piston rotates at a speed of (20-40) r/min, and at the moment, the pressure of the whole verification system ispAnd for a period of time, i.e. when the solenoid valve is in an open state and the standard pressure generator is in a measuring mode, the pressures of the piston system, the standard pressure generator and the detected port at the detected tool are allpAnd is maintained for a period of time, the pressure valuepFor the pressure value displayed in the standard pressure generator measurement mode in the initial equilibrium state.
In addition, the pressure control range and the measuring range of the standard pressure generator can cover the measuring range of the piston pressure meter, and the upper limit of the pressure control range and the measuring range of the standard pressure generator is more than or equal to 1.01 times of the upper limit of the measuring range of the piston pressure meter, and the accuracy grade of the piston pressure meter and the standard pressure generator is 0.05 grade and above.
On the basis of FIG. 1, in order to keep the piston displacement range within the working displacement range all the time and achieve the purpose of long-time constant pressure test on the tested instrument of the tested port, the pressures of the piston system and the tested port arepWhen the controller is used, the control method for the balance working position of the piston type pressure gauge shown in fig. 2 can be executed, and specifically comprises the following steps:
step 1: initializing, setting the displacement range of the working position of the piston system ash 0 ~h 1 The solenoid valve is controlled to be in an open state and the standard pressure generator is controlled to be in a closed control mode,h 0 for the displacement of the lowest point of the working position,h 1 is the highest point displacement of the working position.
Step 2: when the displacement sensor detects that the working position of the piston system ish 0 +ΔhWhen (at this time, the relative distance between the piston system and the displacement sensor approachesh 0 Normal number deltahPreferably 1 mm) indicating that the piston has fallen near the lower limit of the operating position, the control standard pressure generator initiates the control mode and closes the solenoid valve.
Step 3: standard pressure generator to be slightly larger thanpPressure of valuep+ΔpPerforming pressure output control (e.g. setting threshold value)p+Δp=1.01pDelta thenp=0.01p) Since the pressure of the standard pressure generator is greater than the pressure of the hydraulic circuitpAt this time, the working medium inside the standard pressure generator is injected into the hydraulic circuit, so that the piston position rises.
Step 4: when the displacement sensor detects that the working position of the piston system ish 1 -Δh(at this time, the piston system is close to the displacement sensorh 1 Such ash 1 -1 mm) the standard pressure generator is controlled to close the control mode and the solenoid valve is opened.
Therefore, the controller can cyclically execute the operation steps from the step 1 to the step 4 by monitoring the working position of the piston system, so that the standard piston can always keep in a normal working state, the purpose of long-time constant pressure test on the tested device is achieved, and the manual operation quantity can be greatly reduced.
Further, in the setting of step 1, the standard pressure generator may be set in a measurement mode to measure the pressure of the hydraulic circuit, where the pressures of the standard piston, the standard pressure generator and the measured tool are all measuredp. In addition, the working position displacement rangeh 0 ~h 1 The relative installation position of the displacement sensor and the normal movement range of the piston are related, and can be measured in advance according to experiments.
Further, the displacement sensor may preferably be a high-precision contactless laser displacement sensor to ensure accuracy of the relative distance measurement.
In step 3, the working medium supplemented in the standard pressure generator is the same as the medium in the oil cup, preferably oil medium such as transformer oil or di (2-ethylhexyl) sebacate, and the purpose of supplementing pressure is achieved by injecting the working medium into the hydraulic circuit. In addition, in order to prevent overshoot by rapid rise of the piston position at the time of pressure compensation, ΔpIs not too large, and the output pressure of the standard pressure generator can be preferably 1.01p~1.05pPressure value of (a), i.e. deltap1%p~5%p。
Further, in step 4, after the standard pressure generator is turned off in the control mode, the measurement mode may be started, wherein the pressures of the standard piston, the standard pressure generator and the measured instrument are kept constantp。
Furthermore, in step 1, the pressure control range and the measuring range of the standard pressure generator can cover the measuring range of the piston type pressure gauge, and the upper limit of the pressure control range and the measuring range of the standard pressure generator is more than or equal to 1.01 times of the upper limit of the measuring range of the piston type pressure gauge, so that the standard pressure generator is ensured to have basic pressure control and measuring capability. The accuracy class of the piston manometer and the standard pressure generator is 0.05 level and above, thereby ensuring the accuracy of the whole measuring and controlling system.
Further, if the measured pressure of the standard pressure generator is greater than a certain threshold value when performing steps 1-4δWhen the pressure is not within%p±δ) When the range is reached, the system is not under the constant pressure measurement condition (the constant pressure test can be stopped, the measurement can be abnormal or disturbed), and the execution of the steps 1-4 is immediately stopped and the program is stopped, so that the error pressurization work is avoided,δcan be set to 0.1p。
In several embodiments provided in the present invention, each of the functional units in steps 1-4 may be integrated into one controller processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit. The integrated units may be implemented in hardware or in hardware plus software functional units. The integrated units implemented in the form of software functional units described above may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium, and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to perform part of the steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A control method for the balance working position of a piston pressure gauge is characterized in that a balance system of the piston pressure gauge is provided with a displacement sensor, a controller, a standard pressure generator and an electromagnetic valve, the controller is respectively connected with the displacement sensor, the standard pressure generator and the electromagnetic valve in a signal manner, the displacement sensor is arranged below the piston system, the output end of the standard pressure generator is connected with a hydraulic circuit, the electromagnetic valve is arranged on the hydraulic circuit between the output end of the standard pressure generator and a detected port, and the pressures at the piston system and the detected port are respectivelypThe controller is capable of performing the following steps:
step 1: initializing, setting the displacement range of the working position of the piston system ash 0 ~h 1 The solenoid valve is controlled to be in an open state and the standard pressure generator is controlled to be in a closed control mode,h 0 for the displacement of the lowest point of the working position,h 1 is the highest point displacement of the working position;
step 2: when the displacement sensor detects that the working position of the piston system ish 0 +ΔhWhen the standard pressure generator is controlled to start the control mode and the electromagnetic valve is closed, deltahIs a positive constant;
step 3: the standard pressure generator is slightly larger thanpPressure of valuep+ΔpPressure output control is performed to inject the working medium inside the standard pressure generator into the hydraulic circuit to raise the piston system, deltapIs a positive constant;
step 4: when the displacement sensor detects that the working position of the piston system ish 1 -ΔhWhen the standard pressure generator is controlled to close the control mode and the solenoid valve is opened.
2. The method for controlling the balance working position of a piston pressure gauge according to claim 1, wherein the piston pressure gauge is required to be in the balance working position before performing steps 1-4; firstly, a measured instrument is arranged at a detected port on a piston type pressure gauge, a weight with corresponding pressure is arranged on a piston system, the piston system floats to a working position through the pre-pressing of a pre-pressing pump and the fine adjustment of a pressure regulating pump, the piston system rotates at the speed of (20-40) r/min, and the pressure of the whole verification system is kept to bepAnd after a period of time, step 1-4 is performed.
3. The method for controlling the equilibrium operating position of a piston manometer according to claim 2, characterized in that said deltap1%p5%p, the deltah1mm to 3mm.
4. A method of controlling the balance operating position of a piston pressure gauge according to claim 3, further comprising, in step 1, setting a standard pressure generator in a measurement mode to measure the pressure of the hydraulic circuit.
5. A method of controlling a balanced operating position of a piston pressure gauge according to claim 3, wherein the displacement sensor is a laser displacement sensor.
6. A method according to claim 3, characterized in that the working medium supplied through the inside of the standard pressure generator is in particular an oil medium and is identical to the medium in the oil cup.
7. A method of controlling the equilibrium operating position of a piston pressure gauge according to claim 3 wherein the normal pressure generator starts the measurement mode immediately after the normal pressure generator is turned off in step 4, and the pressures of the piston system, the normal pressure generator and the port under test are maintained at the same timep。
8. The method according to claim 1, wherein the pressure control range and the measurement range of the standard pressure generator can cover the measurement range of the piston pressure generator, and the upper limit of the pressure control range and the measurement range of the standard pressure generator is not less than 1.01 times the upper limit of the measurement range of the piston pressure generator, and the accuracy class of the piston pressure generator and the standard pressure generator is 0.05 level or more.
9. The method according to claim 4 or 7, wherein if the controller determines that the measured pressure of the standard pressure generator is greater than the preset threshold value when performing steps 1-4, the controller immediately stops performing steps 1-4 and exits the routine.
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| CN202311801202.1A CN117472107B (en) | 2023-12-26 | 2023-12-26 | Control method for balance working position of piston type pressure gauge |
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