CN108240889A - A kind of device and method for calibrating high static pressure differential pressure device - Google Patents
A kind of device and method for calibrating high static pressure differential pressure device Download PDFInfo
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- CN108240889A CN108240889A CN201611204694.6A CN201611204694A CN108240889A CN 108240889 A CN108240889 A CN 108240889A CN 201611204694 A CN201611204694 A CN 201611204694A CN 108240889 A CN108240889 A CN 108240889A
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- 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
Abstract
The present invention provides a kind of device and method for calibrating high static pressure differential pressure device, and described device carries out the calibration under the conditions of high static pressure for the differential pressure device of external reception calibration, including first pressure controller, second pressure controller, pressure on-off valve and main control unit.Apparatus of the present invention control first pressure controller, second pressure controller and pressure on-off valve to realize the automatic calibration to high static pressure differential pressure device by main control unit, by the connection of pressure on-off valve/off-state control eliminate due to output pressure caused by the intrinsic gauging precision of measurement device it is of different sizes the problem of, calibration accuracy is further improved, and is avoided in pressure reduction since high static pressure differential pressure device pressure at two ends difference excessive leads to high static pressure differential pressure device failure；The method of the present invention controls two pressure controllers to automatically provide differential pressure using main control unit, and operation is simple, easy to use.
Description
Technical field
The invention belongs to pressure measurements to calibrate field, and in particular to a kind of device for calibrating high static pressure differential pressure device and side
Method.
Background technology
Common differential pressure device includes differential pressure pick-up, differential pressure pressure transmitter (pressure transmitter), poor
Pressure pressure table and differential pressure controller etc., when the input terminal of the differential pressure device inputs certain pressure difference, which can be defeated
Go out or show a signal with the pressure differential that is inputted into certain functional relation.
Differential pressure device needs to calibrate its precision before manufacture or after a period of use；Moreover, differential pressure device is in difference
Different performances is typically exhibited under static pressure, and difference is very notable, the calibration of existing differential pressure device is typically only capable to quiet
It presses to be calibrated under conditions of atmospheric pressure, and high static pressure differential pressure calibrating installation and method are not popularized at present and the field
A problem.
Application is preferable at present, and can reach a kind of method of very high accuracy for dual Piston high static pressure differential piston,
But since dual Piston high static pressure pressure drop piston operating process is more complicated, it is subject to certain restrictions its application.
Application publication number provides a kind of partial pressure mode high static pressure differential pressure generating for the patent document of CN104655364A,
The device includes control pressurer system, voltage divider system and standard piston system, and voltage divider system uses the partial pressure side of coaxial three piston
Formula is pressurizeed by external control pressurer system, which is applied to by voltage divider system by school differential pressure meter high-low pressure both ends, when
When reaching setting static pressure, apply corresponding differential pressure counterweight on standard piston, and adjust standard piston and be in operating position, realize
The calibration of each differential pressure point under different hydrostatic pressure conditions.The invention device provides required Gao Jing using external control pressurer system for system
Pressure, high accuracy differential pressure is provided, but also have the following disadvantages using standard piston for system：The invention device, which utilizes, has step
Piston differential pressure is provided, this piston is due to needing high machining accuracy, however, it is difficult to realize, industrially be difficult to general
And；The device needs to manually adjust the differential pressure counterweight on standard piston to change differential pressure, therefore, inconvenience complicated for operation, precision
It is influenced by artificial subjective factor.
Invention content
The purpose of the present invention is to solve the above problems, provide a kind of easy to operate, differential pressure control accuracy height and are easy to
The device of calibration high static pressure differential pressure device industrially applied.
The above-mentioned purpose of the present invention is realized by following technical scheme：
A kind of device for calibrating high static pressure differential pressure device, the differential pressure device (5) for external reception calibration carry out high static pressure
Under the conditions of calibration, including first pressure controller (1), second pressure controller (2), pressure on-off valve (4) and main control unit
(3), side pressure interface gas circuit of the first pressure controller (1) respectively with pressure on-off valve (4) and the differential pressure device (5) connects
It is logical, second pressure controller (2) the opposite side pressure interface gas circuit with pressure on-off valve (4) and the differential pressure device (5) respectively
Connection；Differential pressure device (5), the control terminal of pressure on-off valve (4), first pressure controller (1) and second pressure controller (2) point
It is not electrically connected to main control unit (3).
In the device of the calibration high static pressure differential pressure device, the main control unit (3) including main control board (31) with
And the sample circuit (32) and man-machine interaction unit (33) being electrically connected with main control board (31), the differential pressure device (5) are electrically connected
It is connected to sample circuit (32)；The control terminal of pressure on-off valve (4) is electrically connected to main control board (31).
In the device of the calibration high static pressure differential pressure device, first pressure controller (1) connected including gas circuit first
Pressure control unit (11) and first pressure sensor (12), the second pressure control unit that second pressure controller (2) is connected including gas circuit
(21) and second pressure sensor (22), pressure on-off valve (4) equipped with first pressure interface (42), second pressure interface (43) and
Control terminal (41), first pressure interface (42) are connected with first pressure control unit (11) gas circuit, second pressure interface (43) and second
Pressure control unit (21) gas circuit connects；First pressure sensor (12) and second pressure sensor (22) are electrically connected respectively to master control list
First (3).
In the device of the calibration high static pressure differential pressure device, an independent pressure source (6), the pressure source point are further included
It is not connected with the first pressure control unit (11) and second pressure control unit (21) gas circuit.
In the device of the calibration high static pressure differential pressure device, a booster (7) is further included, the pressure source (6) passes through
Booster (7) is connect respectively with the first pressure control unit (11) and second pressure control unit (21) gas circuit.
In the device of above-described calibration high static pressure differential pressure device, the differential pressure device (5) is differential pressure pick-up, differential pressure
Flowmeter, differential pressure gauge, differential pressure transmitter or differential pressure pressure switch.
The sample circuit (32) is A/D sample circuits or switch sample circuit.
The main control unit (3) is integrated into the first pressure controller (1) or second pressure controller (2).
The device of the another form of calibration high static pressure differential pressure device of the present invention, on the basis of foregoing teachings, first pressure
Force controller (1), second pressure controller (2) and main control unit (3) are integrated into binary channels pressure controller (8), wherein, first
The pressure control unit channel one (81) and one pressure sensor of channel (82) that pressure controller (1) is connected including gas circuit, second pressure
The pressure control unit channel two (83) and two pressure sensor of channel (84) that controller (2) is connected including gas circuit, first pressure control
Device (1) and second pressure controller (2) form two independent pressure control unit channels of the binary channels pressure controller (8).
The present invention also provides a kind of method for calibrating high static pressure differential pressure device, using above-described calibration high static pressure differential pressure
The device of device carries out the calibration of differential pressure device (5), includes the following steps：
Step 1：Pressure on-off valve (4) is switched into connected state with by first pressure controller (1) and second pressure control
First pressure controller (1) is switched to pressure output pattern and controls one setting pressure P0 of its output by device (2) connection processed, will
Second pressure controller (2) switches to measurement pattern, it is made to measure the pressure value that first pressure controller (1) exports, and record
For P0 ˊ；
Step 2：Pressure on-off valve (4) is switched into off-state, and second pressure controller (2) is switched to pressure
Output mode, control first pressure controller (1) make its output pressure P0, and second pressure controller (2) is controlled to make its pressure
It exports as P0 ˊ, record is calibrated the instrument show value of high static pressure differential pressure device (5) at this time；
Step 3：The pressure output of first pressure controller (1) is sequentially adjusted in P0+ Δs X1, P0+ Δ X2 ..., P0+
Δ X (n-1), P0+ Δs Xn, P0+ Δ X (n-1) ..., P0+ Δs X2, P0+ Δ X1, P0, wherein, Δ X represents pressure differential, and n is nature
Number, and Δ Xn>ΔX(n-1)；In the process, the pressure output of second pressure controller (2) is controlled always at P0 ˊ, record
It is calibrated instrument show value of the high static pressure differential pressure device (5) at each pressure spot；
Step 4：First pressure controller (1) and second pressure controller (2) are switched into pressure measurement state, then
Pressure on-off valve (4) is switched into connected state, what control first pressure controller (1) and second pressure controller (2) exported
Pressure reduction is to atmospheric pressure；
Step 5：Return to step changes the step the setup pressure value P0 in one together, completes differential pressure device under different static pressure
(5) calibration.
Above-mentioned technical proposal is used, the solution have the advantages that：Apparatus of the present invention pass through the first pressure of main control unit control
Force controller, second pressure controller and pressure on-off valve realize the automatic calibration to high static pressure differential pressure device, are led to by pressure
The connection of disconnected valve/off-state control is eliminated since output pressure caused by the intrinsic gauging precision of measurement device is of different sizes
Problem further improves calibration accuracy, and avoids in pressure reduction since high static pressure differential pressure device pressure at two ends difference is excessive
Lead to high static pressure differential pressure device failure；The method of the present invention controls two pressure controllers to automatically provide differential pressure using main control unit,
It is operated simply, easy to use.
Description of the drawings
Fig. 1 is the principle schematic of the device of the calibration high static pressure differential pressure device of the present invention；
Fig. 2 is the structure diagram of the embodiment one of the device of the calibration high static pressure differential pressure device of the present invention；
Fig. 3 is the structure diagram of the embodiment two of the device of the calibration high static pressure differential pressure device of the present invention；
Fig. 4 is the structure diagram of the embodiment three of the device of the calibration high static pressure differential pressure device of the present invention；
Reference numeral is expressed as in figure：
1：First pressure controller, 11：First pressure control unit, 12：First pressure sensor；
2：Second pressure controller, 21：Second pressure control unit, 22：Second pressure sensor；
3：Main control unit, 31：Main control board, 32：Sample circuit, 33：Man-machine interaction unit；
4：Pressure on-off valve, 41：Control terminal, 42：First pressure interface, 43：Second pressure interface；
5：Differential pressure device, 51：Third pressure interface, 52：4th pressure interface；
6：Pressure source；7：Booster；
8：Binary channels pressure controller, 81：Pressure control unit channel one, 82：One pressure sensor of channel, 83：Pressure control unit
Channel 2,84：Two pressure sensor of channel.
Specific embodiment
The calibration of existing differential pressure device is typically only capable to be calibrated under conditions of static pressure is atmospheric pressure, and high static pressure is poor
Pressure calibrating installation and method are not popularized at present, the application at present of dual Piston or three piston partial pressure type high static pressure differential pistons compared with
It is good, and a kind of method of very high accuracy can be reached, but since piston type high static pressure pressure drop piston operating process is more multiple
It is miscellaneous, it is subject to certain restrictions its application.The present invention provides a kind of using main control unit control first pressure controller, second pressure
Controller and pressure on-off valve realize the automatic calibration to high static pressure differential pressure device, pass through connection/disconnection shape of pressure on-off valve
State control eliminate due to output pressure caused by the intrinsic gauging precision of measurement device it is of different sizes the problem of, further improve
Calibration accuracy, and avoid in pressure reduction since high static pressure differential pressure device pressure at two ends difference excessive leads to high static pressure differential pressure device
Damage.
Below in conjunction with the drawings and specific embodiments, the device and method of the calibration high static pressure differential pressure device of the present invention is carried out
It is described in detail.
Calibrate the device of high static pressure differential pressure device
Fig. 1 and Fig. 2 be apparatus of the present invention principle signal and topology example (thick line expression physics pipeline connects, filament table
Show electrical connection).As depicted in figs. 1 and 2, the device of calibration high static pressure differential pressure device of the invention include first pressure controller 1,
Second pressure controller 2, pressure on-off valve 4 and main control unit 3, first pressure controller 1 respectively with pressure on-off valve 4 and outer
Receive the side pressure interface gas circuit connection of the differential pressure device 5 of calibration, second pressure controller 2 respectively with pressure on-off valve 4 and
The opposite side pressure interface gas circuit connection of external differential pressure device 5；Differential pressure device 5, the control terminal of pressure on-off valve 4, the first pressure
Force controller 1 and second pressure controller 2 are electrically connected respectively to main control unit 3.
In embodiment one shown in Fig. 2, first pressure controller 1 includes the first pressure control unit 11 and the of gas circuit connection
One pressure sensor 12, second pressure controller 2 include the second pressure control unit 21 and second pressure sensor 22 of gas circuit connection,
Pressure on-off valve 4 is equipped with first pressure interface 42, second pressure interface 43 and control terminal 41, and first pressure interface 42 and first is controlled
The connection of 11 gas circuit of unit is pressed, second pressure interface 43 is connected with 21 gas circuit of the second pressure control unit；Main control unit 3 includes governor circuit
Plate 31 and the sample circuit 32 being electrically connected with main control board 31 and man-machine interaction unit 33, differential pressure device 5, which is electrically connected to, to be adopted
Sample circuit 32；The control terminal of pressure on-off valve 4 is electrically connected to main control board 31, and differential pressure device 5 is equipped with third pressure interface 51
With the 4th pressure interface 52, differential pressure device 5 is as device to be calibrated, and the of third pressure interface 51 and pressure on-off valve 4
One pressure interface 42 is connected with 11 gas circuit of the first pressure control unit, and the second pressure of the 4th pressure interface 52 and pressure on-off valve 4 connects
Mouth 43 is connected with 21 gas circuit of the second pressure control unit.
In embodiment one shown in Fig. 2, an independent pressure source 6 is further included, which can directly control with first
Pressure unit 11 connects (not shown) with 21 gas circuit of the second pressure control unit, can also connect as shown in Figure 2 with 7 gas circuit of a booster
Logical, booster 7 connects again with the first pressure control unit 11 and 21 gas circuit of the second pressure control unit, and the benefit set in this way is small-range
Pressure source 6 can by booster 7 effect available for wide range pressure device 5 calibration, expand the use of pressure source 6
Range further reduces the volume of device, reduces cost.Specifically, pressure source 6 can be air pump or nitrogen cylinder, can
To provide the pressure output more than 6MPa, booster 7 is capable of providing the pressure source output more than 25MPa.
First pressure control unit 11 and the second pressure control unit 21 provide pressure input, 5 basis of differential pressure device for differential pressure device 5
Its receive pressure input and output or display with input pressure differential into certain functional relation signal.For the ease of external or tear open
Except differential pressure device 5,51 and the 4th pressure interface 52 of third pressure interface of differential pressure device 5 is connect with pipeline to be inserted using dismountable
Load connects.
Pressure on-off valve 4, which has, connects and disconnects two states, the control of main control unit 3 two being electrically connected with its control terminal 41
The switching of a state.When pressure on-off valve 4 is in connected state, the first pressure control unit 11 and 21 gas circuit of the second pressure control unit connect
It is logical, so as to which the pressure at two pressure interface ends of differential pressure device 5 is identical, can eliminate due to first pressure controller 1 and second
First pressure sensor 12 inside pressure controller 2 and output pressure caused by the measurement accuracy of second pressure sensor 22
Different problem, and high static pressure differential pressure device is not easy to be damaged.Specifically, pressure on-off valve 4 can be solenoid valve, it is pneumatic
Valve or other can realize the valve of connection/break function.
First pressure control unit 11 and the second pressure control unit 21 can be existing pressure control mechanisms, the pressure of the first pressure control unit 11
First pressure sensor 12 is connected at power output interface position, which can measure the first pressure control unit 11 in real time
Output pressure (i.e. the pressure size at 51 end of third pressure interface of differential pressure device 5), and measured pressure value is transmitted to
Main control unit 3 equally, connects second pressure sensor 22, the pressure at the pressure output interface position of the second pressure control unit 21
Sensor 22 can measure output pressure (i.e. 52 end of the 4th pressure interface of differential pressure device 5 of the second pressure control unit 21 in real time
Pressure size), and measured pressure value is transmitted to main control unit 3.First pressure sensor 12 and second pressure sensor
22 are respectively electrically connected to the first pressure control unit 11 and the second pressure control unit 21, and first pressure sensor 12 and second pressure pass
Sensor 22 is connect respectively with the first pressure control unit 11 and 21 gas circuit of the second pressure control unit.
In embodiment one shown in Fig. 2, first pressure controller 1 is identical with 2 structure and function of second pressure controller,
It can switch between two operating modes of pressure output pattern and pressure measurement mode under the control of main control unit 3.When
When one pressure controller 1 and/or second pressure controller 2 are in pressure output pattern, a setting pressure can be exported, this sets
The occurrence of constant-pressure is set by the man-machine interaction unit 33 of main control unit 3.The first pressure control unit 11 and/or second is controlled
Pressure unit 21 receives the setup pressure value from main control unit 3 and is sensed according to first pressure sensor 12 and/or second pressure
The pressure value that device 22 measures adjusts the size of the output pressure of the first pressure control unit 11 and/or the second pressure control unit 21 in real time, directly
Until the pressure value of its output is equal to setting pressure；When first pressure controller 1 and/or second pressure controller 2 are in pressure
During power measurement pattern, the first pressure control unit 11 and/or the second pressure control unit 21 measure the pressure at its output interface respectively, are pressing
Under power measurement pattern, the first pressure control unit 11 and/or the second pressure control unit 21 are to the pressure of output without adjusting.
Selectively, differential pressure device 5 can be a differential pressure pick-up, and gas circuit connection mode is as shown in Fig. 2, the differential pressure passes
Sensor is electrically connected to the sample circuit 32 of main control unit 3, which is A/D sample circuits, and the difference is measured by main control unit 3
The electric signal output value of pressure transmitter.
Selectively, differential pressure device 5 can be a differential pressure flowmeter, and gas circuit connection mode is as shown in Fig. 2, the differential pressure stream
Gauge is electrically connected to the sample circuit 32 of main control unit 3, which is A/D sample circuits, and differential pressure is measured by main control unit 3
The electric signal output value of flowmeter.
Selectively, differential pressure device 5 can be a differential pressure pressure switch, and gas circuit connection mode is as shown in Fig. 2, the differential pressure
Pressure switch is electrically connected to the sample circuit 32 of main control unit 3, which is switch sample circuit, is sentenced by main control unit 3
The conducting of the make and break contact of offset pressure pressure switch and off-state.
Selectively, differential pressure device 5 can be a differential pressure gauge, and gas circuit connection mode is as shown in Fig. 2, by manually reading
Take the output valve of differential pressure gauge.
Embodiment one shown in Fig. 2 is only a kind of way of realization of apparatus of the present invention, and apparatus of the present invention are not limited to this, can
The implementation of the present invention is improved or be deformed based on present inventive concept, can also achieve the object of the present invention, for example, this hair
Bright device can not have main control unit 3, using first pressure controller 1 or second pressure controller 2 as master controller, make at this time
First pressure controller 1 or second pressure controller 2 for master controller have independent pressure control channel, while can also control
The output valve of pressing pressure on-off valve 4 and acquisition differential pressure device 5；Equally, independent pressure source 6 and booster 7 can also be removed,
Component with 6 said function of pressure source is integrated into first pressure controller 1 and second pressure controller 2；It even can be with
First pressure controller 1 and second pressure controller 2 pressure channel different as two are integrated into same master controller
In.
The device of the invention relative to the prior art advantageous effect：The pressure simple in structure for being easily assembled to and preparing, provide
Difference and static pressure precision are higher, efficiently provide differential pressure, and calibration process is automatically participated in without personnel.
Fig. 3 is please referred to, Fig. 3 shows the structural frames of the embodiment two of the device of present invention calibration high static pressure differential pressure device
Figure.The device of calibration high static pressure differential pressure device in embodiment shown in Fig. 3 and calibration high static pressure differential pressure device shown in Figure 2
Device structure it is similar, difference lies in sample circuit 32, main control board 31 and man-machine interaction unit 33 are integrated in described
The inside of first pressure controller 1, the main control unit 3 that sample circuit 32, main control board 31 and man-machine interaction unit 33 form
It is electrically connected respectively with pressure on-off valve 4, differential pressure device 5 and second pressure controller 2.It is to be appreciated that main control unit 3 can also
It is integrated with the second pressure controller 2, the integrated level of system can be increased in this way.
Referring to Fig. 4, Fig. 4 shows three structure diagram of embodiment of the device of present invention calibration high static pressure differential pressure device.
The device of calibration high static pressure differential pressure device in embodiment shown in Fig. 4 and calibration high static pressure differential pressure device shown in Figure 2
The structure of device is similar, and difference lies in first pressure controllers 1, second pressure controller with embodiment one shown in Fig. 2
2 components identical with 3 function of main control unit all integrate, and form a total pressure controller, i.e. binary channels pressure control
Device 8 processed, wherein, first pressure controller 1 and second pressure controller 2 are as two independences in binary channels force controller 8
Pressure control unit channel, i.e., first pressure controller 1 be used as first passage, by the pressure control unit channel 1 and channel in Fig. 4
One pressure sensor 82 forms, and second pressure controller 2 is used as second channel, by the pressure control unit channel 2 83 in Fig. 4 and leads to
Two pressure sensor 84 of road forms；The binary channels pressure controller 8 connect pass with the gas circuit connection relation and circuit of pressure device 5
System is identical with embodiment one.The embodiment can also further increase the integrated level of system.
The method for calibrating high static pressure differential pressure device
The above embodiment of the present invention can have various different embodiments, all meet from the principle of work and power shown in FIG. 1
Operation principle.The present invention provides a kind of method for calibrating high static pressure differential pressure device, and this method uses above-mentioned calibration high static pressure differential pressure
The device of device carries out the calibration of differential pressure device, includes the following steps：
Step 1：Pressure on-off valve 4 is switched into connected state with by first pressure controller 1 and second pressure controller
First pressure controller 1 is switched to pressure output pattern and controls one setting pressure P0 of its output, by second pressure by 2 connections
Controller 2 switches to measurement pattern, it is made to measure the pressure value of 1 output of first pressure controller, and be recorded as P0 ˊ；
Step 2：Pressure on-off valve 4 is switched into off-state, and second pressure controller 2 is switched to pressure output
Pattern, control first pressure controller 1 make its output pressure P0, and control second pressure controller 2 that its pressure output is made to be P0
ˊ, record are calibrated the instrument show value of high static pressure differential pressure device 5 at this time；
Step 3：The pressure output of first pressure controller 1 is sequentially adjusted in P0+ Δs X1, P0+ Δ X2 ..., P0+ Δ
X (n-1), P0+ Δs Xn, P0+ Δ X (n-1) ..., P0+ Δs X2, P0+ Δ X1, P0, in the process, second pressure controller 2
Pressure output control always at P0 ˊ, record is calibrated high static pressure differential pressure 5 instrument at each pressure spot of device and shows
Value；Here, Δ X represents pressure differential, and n is natural number, and Δ Xn>ΔX(n-1)；
Step 4：First pressure controller 1 and second pressure controller 2 are switched into pressure measurement state, then will pressure
Power on-off valve 4 switches to connected state, and the pressure reduction that control first pressure controller 1 and second pressure controller 2 export is extremely
Atmospheric pressure；
Step 5：Return to step change the step together in one setup pressure value P0 (for example, can value 0MPa, 1MPa,
2MPa, 3MPa, 4MPa, 5MPa or 6MPa etc.), complete the calibration of differential pressure device 5 under different static pressure.
In step 1, when the pressure that control first pressure controller 1 exports is P0, (P0 can pass through main control unit 3
Setting, and due to the measurement of the first pressure sensor 12 inside first pressure controller 1, there are certain error, first pressures
1 reality output pressure of controller may be P0 〞), since the measurement of the second pressure sensor 22 of second pressure controller 2 also can
There are certain errors, and therefore, it may be P0 ˊ that second pressure controller 2, which measures obtained pressure,.Due to first pressure sensor 1
There is certain measurement accuracy with second pressure sensor 2, therefore, measurement obtains pressure, and there may be certain with actual pressure
Error, the error is in its precision allowed band.Pressure on-off valve 4 manages first pressure controller 1 and second pressure controller 2
Road connects, and for second pressure controller 2, it is also P0 〞 to measure the obtained corresponding actual pressures of pressure P0 ˊ.Therefore,
In step 2, when second pressure controller 2 is under pressure output pattern, the measurement of second pressure sensor 22 is exported
During pressure P0 ˊ, practical output pressure is also P0 〞.By step 1, the first pressure controller 1 in step 2 can be eliminated
With second pressure controller 2 due to the different problem of output pressure caused by the measurement accuracy of its internal pressure sensor, make
It is identical with the pressure of 2 reality output of second pressure controller to obtain the first pressure controller 1 in step 2.
Preferentially, first pressure controller 1 and/or second pressure controller 2 use high-precision pressure controller.
In step 2, pressure on-off valve 4 is switched into off-state, first pressure controller 1 and second pressure control
Pipeline connection between device 2 disconnects, first pressure controller 1 and second pressure controller 2 separately output pressure.In step
In rapid two, although 1 output pressure P0 of first pressure controller, 2 pressure output of second pressure controller is P0 ˊ, and first presses
The reality output pressure of force controller 1 and second pressure controller 2 is P0 〞, exports the two of supreme static pressure difference voltage device 5 at this time
The pressure differential at end is 0, records the show value of high static pressure differential pressure device at this time.
Pressure break-make is remained during first pressure controller 1 and second pressure controller 2 are increased to P0
Valve 4 is opened, and the pressure differential at 5 both ends of high static pressure differential pressure device is zero in this way during boosting, so that high static pressure differential pressure
Device is not easy to be damaged, and therefore, P0 can be set as to a higher pressure value, so as to be realized in step 3 in high static pressure P0
Lower calibration high static pressure differential pressure device.
In step 3, the actual pressure difference that high static pressure differential pressure device 5 detects can for example be followed successively by Δ X1, Δ X2, Δ
X3, Δ X4, Δ X3, Δ X2, Δ X1 and 0, can be to four in the range ability of high static pressure differential pressure device 5 by the step
Point is calibrated.Wherein, Δ X1, Δ X2, Δ X3, Δ X4 value can be set by the man-machine interaction unit 33 in main control unit 3
It is fixed.When the first pressure controller is high-precision pressure controller, the first pressure can be relatively accurately controlled
The variation of controller output pressure.
Above-mentioned Δ X1, Δ X2, Δ X3, Δ X4 pressure value should be smaller, it is preferable that permit no more than high static pressure differential pressure device
Perhaps maximum differential pressure pressure, high static pressure differential pressure device 5 to be protected not to be damaged, it is achieved thereby that calibrating high static pressure under high static pressure P0
Differential pressure device.
In step 4, first pressure controller 1 and second pressure controller 2 are switched into pressure measurement mode, this
When, the pressure inside first pressure controller 1 and second pressure controller 2 is kept at P0, then pressure on-off valve 4 is switched to
Connected state, the pressure reduction that control first pressure controller 1 and second pressure controller 2 export to atmospheric pressure.It thus is avoided that
In pressure reduction, the pressure input difference at high static pressure differential pressure device both ends is excessive, and high static pressure differential pressure device is caused to damage.
Test case
It is tested by taking embodiment one shown in Fig. 2 as an example below.
In embodiment one shown in Fig. 2, differential pressure device 5 is differential pressure transmitter, and specified differential pressure range is 0 to 10kPa,
The static pressure that can be born is up to 7000kPa, and ranging from the 4 to 20mA of output signal.First pressure controller 1 is intelligent pressure control
Device processed, pressure output range 0 to 7000kPa, pressure stabilities 0.003%FS.First pressure sensor 12, range are
7000kPa, precision 0.005%rd+0.005%FS；Second pressure controller 2 be intelligent pressure controller, pressure output model
Enclose 0~7000kPa, pressure stabilities 0.003%FS；Second pressure sensor 22, range 7000kPa, precision 0.005%rd
+ 0.005%FS.The pressure source 6 ranging from 6500 to 7000kPa.Main control unit 3 is for coordinating first pressure controller 1, the
Two pressure controllers 2 and control pressure on-off valve 4 act and measure differential pressure transmitter output.
The test result of 1 test case one of table
P0 ˊ are the pressure output value of first pressure controller 1 that second pressure controller 2 measures in step 1.
The test result of 2 test case two of table
P0 ˊ are the pressure output value of first pressure controller 1 that second pressure controller 2 measures in step 1.
The test result of 3 test case three of table
P0 ˊ are the pressure output value of first pressure controller 1 that second pressure controller 2 measures in step 1.
It is respectively three groups of differential pressure datas that 1000kPa, 4000kPa, 6000kPa are measured according to more than static pressure, from above-mentioned three
The test result of a test case it is concluded that：High static pressure influences the differential pressure measurement precision of differential pressure device 5, differential pressure device 5
Calibration and test, which should add in high static pressure, influences project, as conventional examination and calibration item.
It will be appreciated by those skilled in the art that these embodiments or embodiment are merely to illustrate the present invention without limiting this
The range of invention, the various equivalent variations and modification made to the present invention belong to the disclosure of invention.
Claims (10)
1. a kind of device for calibrating high static pressure differential pressure device, the differential pressure device (5) for external reception calibration carries out high static pressure item
Calibration under part, which is characterized in that including first pressure controller (1), second pressure controller (2), pressure on-off valve (4) and
Main control unit (3), a lateral pressure of the first pressure controller (1) respectively with pressure on-off valve (4) and the differential pressure device (5) connect
Implication road connects, second pressure controller (2) another lateral pressure with pressure on-off valve (4) and the differential pressure device (5) respectively
Interface gas circuit connects；Differential pressure device (5), the control terminal of pressure on-off valve (4), first pressure controller (1) and second pressure control
Device (2) processed is electrically connected respectively to main control unit (3).
2. the device of calibration high static pressure differential pressure device according to claim 1, which is characterized in that the main control unit (3)
The sample circuit (32) and man-machine interaction unit (33) being electrically connected including main control board (31) and with main control board (31),
The differential pressure device (5) is electrically connected to sample circuit (32)；The control terminal of pressure on-off valve (4) is electrically connected to main control board
(31)。
3. the device of calibration high static pressure differential pressure device according to claim 2, which is characterized in that first pressure controller
(1) include the first pressure control unit (11) and first pressure sensor (12) of gas circuit connection, second pressure controller (2) is including gas
The the second pressure control unit (21) and second pressure sensor (22) of road connection, pressure on-off valve (4) is equipped with first pressure interface
(42), second pressure interface (43) and control terminal (41), first pressure interface (42) are connected with first pressure control unit (11) gas circuit,
Second pressure interface (43) is connected with second pressure control unit (21) gas circuit；First pressure sensor (12) and second pressure sensor
(22) it is electrically connected respectively to main control unit (3).
4. the device of calibration high static pressure differential pressure device according to claim 3, which is characterized in that further include an independent pressure
Power source (6), the pressure source connect respectively with the first pressure control unit (11) and second pressure control unit (21) gas circuit.
5. the device of calibration high static pressure differential pressure device according to claim 4, which is characterized in that further include a booster
(7), the pressure source (6) is connected by booster (7) with the first pressure control unit (11) and second pressure control unit (21) gas circuit respectively
It connects.
6. the device of calibration high static pressure differential pressure device according to any one of claims 1 to 5, which is characterized in that the difference
Voltage device (5) is differential pressure pick-up, differential pressure flowmeter, differential pressure gauge, differential pressure transmitter or differential pressure pressure switch.
7. the device of calibration high static pressure differential pressure device according to claim 6, which is characterized in that the sample circuit (32)
For A/D sample circuits or switch sample circuit.
8. the device of calibration high static pressure differential pressure device according to claim 7, which is characterized in that the main control unit (3)
It is integrated into the first pressure controller (1) or second pressure controller (2).
9. the device of calibration high static pressure differential pressure device according to claim 7, which is characterized in that the first pressure control
Device (1), second pressure controller (2) and main control unit (3) are integrated into binary channels pressure controller (8), wherein, first pressure control
The pressure control unit channel one (81) and one pressure sensor of channel (82) that device (1) processed is connected including gas circuit, second pressure controller
(2) include gas circuit connection pressure control unit channel two (83) and two pressure sensor of channel (84), first pressure controller (1) and
Second pressure controller (2) forms two independent pressure control unit channels of the binary channels pressure controller (8).
10. a kind of method for calibrating high static pressure differential pressure device, poor using claim 1 to 9 any one of them calibration high static pressure
The device of voltage device carries out the calibration of differential pressure device (5), which is characterized in that includes the following steps：
Step 1：Pressure on-off valve (4) is switched into connected state with by first pressure controller (1) and second pressure controller
(2) it connects, first pressure controller (1) is switched into pressure output pattern and controls one setting pressure P0 of its output, by second
Pressure controller (2) switches to measurement pattern, it is made to measure the pressure value that first pressure controller (1) exports, and be recorded as P0
ˊ；
Step 2：Pressure on-off valve (4) is switched into off-state, and second pressure controller (2) is switched to pressure output
Pattern, control first pressure controller (1) make its output pressure P0, and second pressure controller (2) is controlled to make its pressure output
For P0 ˊ, record is calibrated the instrument show value of high static pressure differential pressure device (5) at this time；
Step 3：The pressure output of first pressure controller (1) is sequentially adjusted in P0+ Δs X1, P0+ Δ X2 ..., P0+ Δ X
(n-1), P0+ Δs Xn, P0+ Δ X (n-1) ..., P0+ Δs X2, P0+ Δ X1, P0, wherein, Δ X represents pressure differential, and n is natural number,
And Δ Xn>ΔX(n-1)；In the process, the pressure output of second pressure controller (2) is controlled always at P0 ˊ, records quilt
Calibrate instrument show value of the high static pressure differential pressure device (5) at each pressure spot；
Step 4：First pressure controller (1) and second pressure controller (2) are switched into pressure measurement state, then will pressure
Power on-off valve (4) switches to the pressure of connected state, control first pressure controller (1) and second pressure controller (2) output
It is reduced to atmospheric pressure；
Step 5：Return to step changes the step the setup pressure value P0 in one together, completes differential pressure device (5) under different static pressure
Calibration.
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| CN108240889B (en) | 2024-02-20 |
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