CN105784341B - A kind of method of the standard set-up and verification of permanent flow valve flow and differential pressure verification - Google Patents

A kind of method of the standard set-up and verification of permanent flow valve flow and differential pressure verification Download PDF

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Publication number
CN105784341B
CN105784341B CN201610120739.5A CN201610120739A CN105784341B CN 105784341 B CN105784341 B CN 105784341B CN 201610120739 A CN201610120739 A CN 201610120739A CN 105784341 B CN105784341 B CN 105784341B
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differential pressure
ball valve
cylinder
valve
piston
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CN105784341A (en
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马龙博
赵建亮
胡涤新
杜伟鹏
张宁宁
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Zhejiang Province Institute of Metrology
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Zhejiang Province Institute of Metrology
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00Testing of machine parts

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Abstract

The present invention relates to a kind of methods of standard set-up and verification that permanent flow valve flow and differential pressure verify.The present invention includes stepper motor, speed reducer, speed reducer metal support, shaft coupling, metal support before leading screw, leading screw, the linear guide, piston metallic support, slidably metal support, feed screw nut, photoelectric reader, floating junction, cylinder-piston, hydraulic cylinder, manual switch ball valve, back pressure pipe, nozzle, cylinder body water inlet line, cylinder body water inlet switch ball valve, three-way pipe, cylinder body outlet conduit, cylinder body effluent switch ball valve, switching ball after discharge pump, meter-clamping apparatus preceding switch ball valve, meter-clamping apparatus, differential pressure transmitter, permanent flow valve, indicating flow meter, discharge pump, discharge pump preceding switch ball valve, water tank.The present invention not only realizes the verification of permanent flow valve flow and differential pressure, it is often more important that by using efficient, the quick feature of piston type liquid flow standard device, substantially reduces the checking time of permanent flow valve flow and differential pressure.

Description

A kind of method of the standard set-up and verification of permanent flow valve flow and differential pressure verification
Technical field
The present invention relates to a kind of piston type liquid flow standard devices and flow verified for permanent flow valve flow and differential pressure With differential pressure method of calibration.
Background technology
When being verified at present to the flow of permanent flow valve and differential pressure, the calibration equipment of use is mainly Static Volumetric Method or quiet State mass method liquid flow standard device.This two class I liquid Is flow standard device meet to a certain extent permanent flow valve flow and The verification requirement of differential pressure, but be mainly shown as in use there is also obvious defect:(i)Static Volumetric Method liquid flow Flow and the differential pressure verification efficiency for measuring standard set-up are low.Since the work measuring instrument of Static Volumetric Method liquid flow standard device is general It is the Pear-Shaped measuring device with metering neck.When carrying out flow and differential pressure verification using device, only liquid reaches at metering neck, amount Volume in device could be read.Therefore, when checking flow is smaller, the verification used time is longer, shows as verification inefficiency;(ii) Flow settling time is long.When the differential pressure of permanent flow valve is adjusted to another target measurement point by a target measurement point, then correspond to Pipeline in flow will change therewith, the pressure that can influence in pressurizing vessel becomes again for the variation of flow in pipeline Change, and the variation of pressure can influence water pump and change to pressurizing vessel water-supply quantity in pressurizing vessel, this change procedure Need longer regulating time that could ensure flow, permanent flow valve in pipeline by the pressure stability in pressurizing vessel within the scope of constant pressure The stabilization of both ends differential pressure, and then realize the verification of permanent flow valve flow and differential pressure;(iii) Static mass method liquid flow standard device In weighing apparatus easily influenced (as vibrated, temperature, humidity etc.) by environment, and environmental condition is difficult to ensure, especially water pump, Pipe vibration, thus weighing apparatus is very affected by environment is easy to happen drift, accuracy is difficult to be guaranteed;(iv)Static volumetric Method or Static mass method liquid flow standard device occupied space are big, are difficult movement if building up, and are used for permanent flow valve flow Verification liquid flow standard device generally requirement with differential pressure is placed in factory side and falls, and requires to be easy to move, therefore device It is difficult to meet the requirements;(v)Static Volumetric Method or Static mass method liquid flow standard device are not easy energy saving, water pump once startup, It no longer stops if even if replacing water meter device during calibrating, therefore it is serious to consume energy.
Patent No.:ZL 2,011 1 0339915.1, patent name are:A kind of apparatus for calibrating water meter and water meter calibration Method, a kind of method for disclosing apparatus for calibrating water meter and water meter calibration.Each chronoscope of apparatus for calibrating water meter in the invention Frequency device respectively with the Pulse Width Control connection of corresponding photoelectric sampler and servo motor;Protect the cylinder of sleeve and hydraulic cylinder Body is fixedly connected, and servo motor is fixed on protection sleeve, and the rotation axis of servo motor is solid by one end of shaft coupling and leading screw Fixed connection, the other end of leading screw are connect with feed screw nut, one end connection of the piston of feed screw nut and hydraulic cylinder;Hydraulic cylinder is equipped with Cylinder body water inlet and cylinder body water outlet, water tank are equipped with water tank inlet and water outlet of water tank, and cylinder body water inlet passes through the first water inlet Pipe is connected to water outlet of water tank, and cylinder body water outlet is equipped with outlet pipe;Second water inlet pipe is installed at water tank inlet, first It is mounted on switch valve on water inlet pipe, the second water inlet pipe and outlet pipe.Shortcoming present in the invention is as follows:(i)Servo The rotation axis of motor directly drives leading screw rotation by shaft coupling, and leading screw coordinates with feed screw nut is converted to work by the rotation of leading screw Plug moves horizontally, and piston is moved horizontally the water discharge in cylinder body.The rotation axis of this servo motor is straight by shaft coupling The kind of drive for connecing driving leading screw rotation, when leading screw is needed to be rotated with lower angular speed and pushes piston operation, servo motor It will be rotated with identical angular speed and provide rotational power for leading screw, servo motor lower in this rotational angular velocity Creeping phenomenon will be will appear, cause entire piston system fluctuation of service;(ii)Using protection sleeve support guide bar, guide rod The structure design that guiding is moved horizontally to piston realizes moving horizontally for piston.Guide rod is mounted on protection sleeve inner, it is difficult to Realize that guide rod and other need horizontal mounting portion(Such as grating scale)Part is horizontally mounted;(iii)Piston displacement distance according to The pulse number for the servo motor output that the chronoscope frequency device of Serve Motor Control connection obtains is calculated.Once watching It takes motor and step loss condition occurs, then calculating piston range ability according to the pulse number of servo motor output just will appear mistake, Therefore in the method for the pulse number calculating piston range ability of servo motor output, there are wretched insufficiencies;(iv)Using cylinder body as appearance The piston that the umber of pulse that product standard and combination are exported by servo motor is calculated moves horizontally distance and establishes apparatus for calibrating water meter Average flux model.Using cylinder body as volumetric standard, it is necessary to accomplish good seal between piston and cylinder body inner section, just can guarantee Piston does not leak between cylinder head and bottom in sliding process.However, once there is impurity in cylinder interior, due to work Gapless between plug and cylinder body, can not dispose impurity in piston operational process, be easy to draw as the cylinder body of volumetric standard Wound causes sealing between piston and cylinder body inner section to go wrong, and then leaks, or even piston cylinder is caused to scrap.
Due to many defects and Patent No. existing for Static Volumetric Method or Static mass method liquid flow standard device:ZL 2011 1 0339915.1, patent name is:Exist in the patent of invention of a kind of method of apparatus for calibrating water meter and water meter calibration Deficiency, therefore be badly in need of a kind of novel liquid flow standard device verified for permanent flow valve flow and differential pressure substitute it is current Static Volumetric Method, Static mass method or Patent No.:The liquid flow standard device invented in ZL 2,011 1 0339915.1.
Invention content
The object of the present invention is to provide a kind of piston type liquid flow standard dresses verified for permanent flow valve flow and differential pressure The method set and the flow and differential pressure of permanent flow valve are verified using the device.
To achieve the above object, the technical solution used in the present invention is:The piston type liquid flow standard dress provided It sets including metal support, leading screw, the linear guide, piston before stepper motor, speed reducer, speed reducer metal support, shaft coupling, leading screw Metallic support, slidably metal support, feed screw nut, photoelectric reader, floating junction, cylinder-piston, y-type seal ring, hydraulic pressure Metal support, flange, manual switch ball valve, back pressure pipe, nozzle, cylinder body water inlet line, cylinder after cylinder, piston metal support, leading screw Switching ball, meter-clamping apparatus after body water inlet switch ball valve, three-way pipe, cylinder body outlet conduit, cylinder body effluent switch ball valve, discharge pump Preceding switch ball valve, preceding straight pipe, differential pressure transmitter, permanent flow valve, rear straight pipe, indicating flow meter preceding switch ball valve, refers to meter-clamping apparatus Show flowmeter, discharge pump, discharge pump preceding switch ball valve, test section metallic support, water tank;The stepper motor is fixed on On speed reducer, the rotation axis of stepper motor is connected with speed reducer input axle sleeve, and the output shaft of speed reducer passes through shaft coupling and silk The end of thick stick one end is fixedly connected, and lead screw shaft is respectively arranged with after the end of leading screw one end and close to the other end of end and leading screw It covers, feed screw nut is housed on the leading screw between leading screw axle sleeve, feed screw nut is fixed on the centre of slidably metal support, slidably Metal support lower end is connect with the linear guide, and slidably metal support top is equipped with floating junction, in floating junction and hydraulic cylinder Cylinder-piston be fixedly connected, between cylinder-piston and hydraulic cylinder be equipped with y-type seal ring;Light is housed on the inside of the linear guide Grid ruler, the photoelectric reader of grating scale are fixedly connected with slidably metal support;The hydraulic cylinder is equipped with cylinder body exhaust calibration Mouthful, cylinder body exhaust calibration mouth is fixedly connected by stainless steel pipes with manual switch ball valve one end, the manual switch ball valve other end It is fixedly connected with back pressure pipe one end, the back pressure pipe other end is fixedly connected with nozzle.The water inlet of hydraulic cylinder is opened by cylinder body water inlet Close ball valve and water tank unicom;The water outlet of hydraulic cylinder is connect with one end of cylinder body effluent switch ball valve, cylinder body effluent switch ball valve The other end connect with preceding straight pipe by three-way pipe, meter-clamping apparatus preceding switch ball valve, the other end of cylinder body effluent switch ball valve is also It is connect with discharge pump by switching ball after three-way pipe, discharge pump, discharge pump is provided on the gas outlet of discharge pump Preceding switch ball valve;Permanent flow valve to be calibrated is provided between preceding straight pipe and rear straight pipe, the both ends of permanent flow valve are parallel with differential pressure Transmitter, rear straight pipe are connect by indicating flow meter preceding switch ball valve with indicating flow meter, and indicating flow meter is connected to water tank.
Further, stepper motor of the present invention is replaced with servo motor.
The side that the present invention verifies the flow and differential pressure of permanent flow valve using the above piston type liquid flow standard device Method includes the following steps:
1) permanent flow valve is mounted between the preceding straight pipe and the rear straight pipe.
2) control stepper motor, which rotates in the forward direction, drives speed reducer to rotate in same direction, and the velocity of rotation of stepper motor is through speed reducer It drives leading screw to rotate forward after deceleration, the rotation of leading screw is converted to by slidably metal by the cooperation of leading screw and feed screw nut The level of bearing is positive mobile, and slidably the level forward direction of metal support is mobile pushes the horizontal positive movement of cylinder-piston, until Cylinder-piston reaches hydraulic cylinder bottom.
3) the manual switch ball valve and cylinder body effluent switch ball valve are closed, the cylinder body water inlet switch ball valve is opened.
4) control stepper motor, which reversely rotates, drives speed reducer to rotate in same direction, and the velocity of rotation of stepper motor is through speed reducer It drives leading screw to rotate backward after deceleration, the rotation of leading screw is converted to by slidably metal by the cooperation of leading screw and feed screw nut The horizontal reverse movement of bearing, slidably the level of metal support, which moves backward, drags cylinder-piston level reverse movement, until Cylinder-piston reaches hydraulic pressure cylinder head;In cylinder-piston makees horizontal reversed moving process, the water in water tank is intake by cylinder body Switching ball and cylinder body water inlet line enter hydraulic cylinder.
5) switching ball after the cylinder body water inlet switch ball valve and discharge pump is closed, the cylinder body effluent switch is opened Ball valve, meter-clamping apparatus preceding switch ball valve and indicating flow meter preceding switch ball valve, open simultaneously permanent flow valve.
6) step 2) is executed, the air in cylinder body outlet conduit is excluded clean.
7) the cylinder body effluent switch ball valve is closed.
8) the cylinder body water inlet switch ball valve is opened, step 4) is executed.
9) the cylinder body water inlet switch ball valve is closed, the manual switch ball valve is opened.
10) step 2) is executed, the air in hydraulic cylinder is excluded.
11) the manual switch ball valve is closed.
12) step 8) is executed repeatedly to step 11), the air in the hydraulic cylinder is excluded clean.
13) switching ball and discharge pump preceding switch ball valve after the opening discharge pump, start discharge pump, by institute The permanent flow valve stated gas in the duct exclude it is clean.
14) discharge pump is shut down, switching ball and discharge pump preceding switch ball after the discharge pump are closed Valve.
15) step 8) is executed, the cylinder body water inlet switch ball valve is closed, opens the cylinder body effluent switch ball valve.
16) permanent flow valve both ends target differential pressure is set by control computer, starts the stepper motor and rotates in the forward direction Speed reducer is driven to rotate in same direction, the velocity of rotation of stepper motor drives leading screw to rotate forward after speed reducer slows down, and passes through The cooperation of leading screw and feed screw nut is positive mobile by the level for being converted to slidably metal support of leading screw, slidably metal The positive mobile promotion cylinder-piston of level of bearing is horizontal positive mobile, and the horizontal forward direction of the cylinder-piston is mobile by hydraulic cylinder Interior water is discharged into water tank by pipeline where permanent flow valve;When the water being discharged in the hydraulic cylinder passes through permanent flow valve, described Permanent flow valve both ends generate differential pressure, which is introduced into differential pressure transmitter by pressure guiding pipe, and the differential pressure transmitter believes differential pressure It number is converted to current signal and is sent into control computer, it is actually poor that current signal is scaled permanent flow valve both ends by control computer again Pressure, and compared with the permanent flow valve both ends target differential pressure of setting, control signal controling stepping motor rotating speed is generated, until permanent flow valve The practical differential pressure in both ends is at the uniform velocity rotated close to target differential pressure, then control computer control stepper motor, is started simultaneously at and is read photoelectricity The pulse signal of several feedbacks carries out chronoscope frequency, and is acquired to the current signal of differential pressure transmitter feedback.
17) timing time that chronoscope frequency is carried out in the pulse signal fed back to photoelectric reader reaches the most short of setting After timing time, stop the chronoscope frequency of the pulse signal fed back to photoelectric reader and the current signal of differential pressure transmitter feedback Acquisition;It is simultaneously stopped stepper motor operation.
18) when carrying out the accumulation that chronoscope frequency obtains to the pulse signal that photoelectric reader is fed back according to control computer Between and cumulative number of pulses, by formulaCalculate the average flow rate of piston type liquid flow standard device:
Q i=(3.14×D 2/4×P i×N i)/t i
FormulaIn,Q iFor the average flow rate of piston type liquid flow standard device;DFor cylinder-piston overall diameter;P iFor light The pulse equivalency of the pulse signal of electric reading head feedback;N it iRespectively control computer believes the pulse that photoelectric reader is fed back Number carry out chronoscope frequency obtained cumulative number of pulses and accumulated time.
Due to the continuity of liquid flowing, the average flow rate of piston type liquid flow standard device is permanent flow valve flow.
19) current signal of the differential pressure transmitter feedback collected according to control computer, by formulaCalculate permanent flow valve The differential pressure at both ends:
⊿p i=[⊿p max×(I i-4)]/16
FormulaIn,⊿p iTo measure the differential pressure at obtained permanent flow valve both ends;⊿p maxFor differential pressure transmitter range;I iFor control The current signal for the differential pressure transmitter feedback that computer acquisition processed obtains.
20) according to the distance of the flow of permanent flow valve and cylinder-piston horizontal movement, judge that stepper motor whether can Continue to rotate in same direction:If can continue to rotate in same direction, repeatedly step 16) to step 19) complete permanent flow valve flow and The verification of differential pressure;If cannot be further continued for rotating in same direction, the primary stream that permanent flow valve 15) is completed to step 19) is thened follow the steps Amount and differential pressure verification.
Beneficial effects of the present invention:
i)Using stepper motor after speed reducer slows down drive leading screw rotation by way of and piston difference parallel with leading screw Axis, the structure that the direction of motion is controlled by the linear guide solve piston and are put with distal end bias existing for the collinear direct connection structure of leading screw Big and piston low speed is caused when running to rub uneven and generates the problem creeped, and improves the uniform of piston low-speed motion Property, improve the measurement capability of lower limit flow.
ii)Using cylinder-piston as volumetric standard, the length standard that grating scale is measured as cylinder-piston displacement distance is built The average flow rate mathematical model of vertical piston type liquid flow standard device substantially increases the accurate of piston range ability measurement Property, ensure that the reliability of the calculating data of flow mathematical model, while solve piston operation in cylinder interior impurity it is clear Except problem(There are gap between cylinder-piston and cylinder body, impurity is precipitable in gap).
iii)Using discharge pump air in test pipe and permanent flow valve excluded it is clean by the way of, be greatly improved exhaust Efficiency.
The method that the present invention is used for permanent flow valve verification, not only realizes the verification of permanent flow valve flow and differential pressure, prior It is efficient, the quick feature by using piston type liquid flow standard device, substantially reduces permanent flow valve flow and differential pressure Checking time overcomes using time-consuming, the laborious defect of traditional liquid flow standard device flow-rate adjustment, has saved energy consumption, greatly Improve dynamic equilibrium verifying work efficiency greatly.
Description of the drawings
Fig. 1 is the structural schematic diagram of the present invention.
Specific implementation mode
The present invention will be further described with reference to the accompanying drawings and examples.
The present invention to traditional based on Static Volumetric Method, Static mass method and existing piston type liquid flow standard by being filled The analysis of many limitations for being highlighted when permanent flow valve flow and differential pressure verification is set, and combines liquid flow standard device new The trend of technology development, it is proposed that a kind of novel piston type liquid flow standard device is verified for permanent flow valve flow and differential pressure Method, realize permanent flow valve flow and the rapid verification of differential pressure.
The mentality of designing of the present invention:By summarizing Patent No.:ZL 2,011 1 0339915.1, patent name are:It is a kind of The deficiency of the method invention patent of apparatus for calibrating water meter and water meter calibration, it is proposed that one kind is adopted using cylinder-piston as standard With stepper motor after speed reducer slows down drive leading screw rotation by way of and piston it is parallel with leading screw not coaxial, the direction of motion by The structure of the linear guide control solves piston and is run with the eccentric amplification in the existing distal end of the collinear direct connection structure of leading screw and piston low speed When caused friction it is uneven and generate the problem creeped, improve the uniformity of piston low-speed motion, improve the survey of lower limit flow Amount ability.Meanwhile the measurement standard using grating scale as cylinder-piston range ability, and using cylinder-piston as volume mark Standard establishes the average flow rate mathematical model of piston type liquid flow standard device, carries out piston type liquid flow standard device stream The accurate measurement of amount.
As shown in Figure 1, inventive piston formula fluid flow device includes stepper motor 1, speed reducer 2, speed reducer metal branch Metal support 5, leading screw 6, the linear guide 7, piston metallic support 8, slidably metal support 9, silk before seat 3, shaft coupling 4, leading screw Thick stick nut 10, photoelectric reader 11, floating junction 12, cylinder-piston 13, y-type seal ring 14, hydraulic cylinder 15, piston metal support 16, metal support 17, flange 18, manual switch ball valve 19, back pressure pipe 20, nozzle 21, cylinder body water inlet line 22, cylinder body after leading screw Switching ball after water inlet switch ball valve 23, three-way pipe 24, cylinder body outlet conduit 25, cylinder body effluent switch ball valve 26, discharge pump 27, meter-clamping apparatus preceding switch ball valve 28, meter-clamping apparatus 29, preceding straight pipe 30, differential pressure transmitter 31, permanent flow valve 32, rear straight pipe 33, refer to Show flowmeter preceding switch ball valve 34, indicating flow meter 35, discharge pump 36, discharge pump preceding switch ball valve 37, test section metal Holder 38, water tank 39.Stepper motor 1 is fixed on speed reducer 2, and the rotation axis of stepper motor 1 is connected with 2 input axle sleeve of speed reducer Connect, the output shaft of speed reducer 2 is fixedly connected by shaft coupling 4 with the end of 6 one end of leading screw, after the end of 6 one end of leading screw and The other end close to end and leading screw 6 is respectively arranged with leading screw axle sleeve, and feed screw nut 10 is housed on the leading screw 6 between leading screw axle sleeve, Feed screw nut 10 is fixed on the centre of slidably metal support 9, and slidably 9 lower end of metal support is connect with the linear guide 7, can be slided Dynamic 9 top of metal support is equipped with floating junction 12, and floating junction 12 is fixedly connected with the cylinder-piston 13 in hydraulic cylinder 15, cylindricality Y-type seal ring 14 is housed between piston 13 and hydraulic cylinder 15;7 inside of the linear guide is equipped with grating scale, the light of grating scale Electric reading head 11 is fixedly connected with slidably metal support 9;The hydraulic cylinder 15 is equipped with cylinder body exhaust calibration mouth, cylinder body exhaust Calibration mouth is fixedly connected by stainless steel pipes with 19 one end of manual switch ball valve, 19 other end of manual switch ball valve and back pressure pipe 20 one end are fixedly connected, and 20 other end of back pressure pipe is fixedly connected with nozzle 21.
As one embodiment of the present invention, stepper motor 1 can be replaced with servo motor.
When being verified to permanent flow valve using the piston type liquid flow standard device of the present invention, the course of work can be divided into Two parts:I) air exclusion process;Ii) permanent flow valve checking procedure.It is specifically described below.
I) air exclusion process:
1) permanent flow valve 32 is mounted between the preceding straight pipe 30 and the rear straight pipe 33;
2) control stepper motor 1, which rotates in the forward direction, drives speed reducer 2 to rotate in same direction, and the velocity of rotation of stepper motor 1 is through subtracting Driving leading screw 6 rotates forward after fast machine 2 slows down, and is converted to the rotation of leading screw 6 by leading screw 6 and the cooperation of feed screw nut 10 Slidably the level of metal support 9 is positive mobile, and slidably the level forward direction of metal support 9 is mobile pushes cylinder-piston 13 horizontal Forward direction is mobile, until cylinder-piston 13 reaches 15 bottom of hydraulic cylinder;
3) the manual switch ball valve 19 and cylinder body effluent switch ball valve 26 are closed, the cylinder body water inlet switch ball is opened Valve 23;
4) control stepper motor 1, which reversely rotates, drives speed reducer 2 to rotate in same direction, and the velocity of rotation of stepper motor 1 is through subtracting Driving leading screw 6 rotates backward after fast machine 2 slows down, and is converted to the rotation of leading screw 6 by leading screw 6 and the cooperation of feed screw nut 10 The slidably horizontal reverse movement of metal support 9, slidably the horizontal reverse movement dragging cylinder-piston 13 of metal support 9 is horizontal Reverse movement, until cylinder-piston 13 reaches 15 head of hydraulic cylinder;In cylinder-piston 13 makees horizontal reversed moving process, water tank Water in 39 enters hydraulic cylinder 15 by cylinder body water inlet switch ball valve 23 and cylinder body water inlet line 22;
5) switching ball 27 after the cylinder body water inlet switch ball valve 23 and discharge pump is closed, the cylinder body water outlet is opened Switching ball 26, meter-clamping apparatus preceding switch ball valve 28 and indicating flow meter preceding switch ball valve 34, open simultaneously permanent flow valve 32;
6) step 2) is executed, the air in cylinder body outlet conduit 25 is excluded clean;
7) the cylinder body effluent switch ball valve 26 is closed;
8) the cylinder body water inlet switch ball valve 23 is opened, step 4) is executed;
9) the cylinder body water inlet switch ball valve 23 is closed, the manual switch ball valve 19 is opened;
10) step 2) is executed, the air in hydraulic cylinder 15 is excluded;
11) the manual switch ball valve 19 is closed;
12) step 8) is executed repeatedly to step 11), the air in the hydraulic cylinder 15 is excluded clean;
13) switching ball 27 and discharge pump preceding switch ball valve 37 after the opening discharge pump, start discharge pump 36, by the permanent flow valve 32 gas in the duct exclude it is clean;
14) discharge pump 36 is shut down, switching ball 27 and discharge pump preceding switch after the discharge pump are closed Ball valve 37;The exclusion of air in complete twin installation.
Ii) permanent flow valve checking procedure:
15) step 8) is executed, the cylinder body water inlet switch ball valve 23 is closed, opens the cylinder body effluent switch ball Valve 26;
16) 32 both ends target differential pressure of permanent flow valve is set by control computer, starts the stepper motor 1 and makees forward direction Rotation drives speed reducer 2 to rotate in same direction, and the velocity of rotation of stepper motor 1 drives leading screw 6 to make positive turn after the deceleration of speed reducer 2 It is dynamic, the level forward direction for being converted to slidably metal support 9 of leading screw 6 is moved by the cooperation of leading screw 6 and feed screw nut 10 Dynamic, the slidably positive movement of the level of metal support 9 pushes horizontal positive mobile, described 13 water of cylinder-piston of cylinder-piston 13 It is straight and even that water in hydraulic cylinder 15 is discharged into water tank 39 by 32 place pipeline of permanent flow valve to mobile;Discharge in the hydraulic cylinder 15 Water by permanent flow valve 32 when, generate differential pressure at 32 both ends of permanent flow valve, which introduces differential pressure by pressure guiding pipe and become Send device 31, the differential pressure transmitter 31 that differential pressure signal is converted to current signal and is sent into control computer, control computer is again Current signal is scaled the practical differential pressure in 32 both ends of permanent flow valve, and compared with 32 both ends target differential pressure of the permanent flow valve of setting, produced Raw control 1 rotating speed of signal controling stepping motor, until the practical differential pressure in 32 both ends of permanent flow valve, close to target differential pressure, then control calculates Machine control stepper motor 1 at the uniform velocity rotates, and starts simultaneously at and carries out chronoscope frequency to the pulse signal that photoelectric reader 11 is fed back, and is right The current signal that differential pressure transmitter 31 is fed back is acquired;
17) timing time that chronoscope frequency is carried out in the pulse signal fed back to photoelectric reader 11 reaches setting most After short timing time, stop the chronoscope frequency of the pulse signal fed back to photoelectric reader 11 and the electricity of the feedback of differential pressure transmitter 31 Flow the acquisition of signal;It is simultaneously stopped the operation of stepper motor 1;
18) accumulation that chronoscope frequency obtains is carried out to the pulse signal that photoelectric reader 11 is fed back according to control computer Time and cumulative number of pulses, by formulaCalculate the average flow rate of piston type liquid flow standard device:
Q i=(3.14×D 2/4×P i×N i)/t i
FormulaIn,Q iFor the average flow rate of piston type liquid flow standard device;DFor 13 overall diameter of cylinder-piston;P iFor The pulse equivalency for the pulse signal that photoelectric reader 11 is fed back;N it iRespectively control computer feeds back photoelectric reader 11 Pulse signal carries out the cumulative number of pulses and accumulated time that chronoscope frequency obtains;
Due to the continuity of liquid flowing, the average flow rate of piston type liquid flow standard device is that permanent flow valve 32 flows Amount;
19) current signal fed back according to the differential pressure transmitter 31 that control computer collects, by formulaCalculate constant current The differential pressure at 32 both ends of valve:
⊿p i=[⊿p max×(I i-4)]/16
FormulaIn,⊿p iTo measure the differential pressure at obtained 32 both ends of permanent flow valve;⊿p maxFor 31 range of differential pressure transmitter;I i The current signal that the differential pressure transmitter 31 that computer acquisition obtains in order to control is fed back;
20) according to the flow of permanent flow valve 32 and the distance of the horizontal movement of cylinder-piston 13, judge that stepper motor 1 is It is no to can continue to rotate in same direction:If can continue to rotate in same direction, repeatedly step 16) to step 19) completes permanent flow valve The verification of 32 flows and differential pressure;If cannot be further continued for rotating in same direction, thens follow the steps and 15) complete permanent flow valve to step 19) 32 flow and differential pressure verification;
21) verification of the step 20) completion to permanent flow valve 32 flow and differential pressure is repeated.
Above-mentioned specific implementation mode is used for illustrating the present invention, rather than limits the invention, the present invention's In spirit and scope of the claims, to any modifications and changes that the present invention makes, the protection model of the present invention is both fallen within It encloses.

Claims (3)

1. a kind of piston type liquid flow standard device, it is characterised in that:Including stepper motor (1), speed reducer (2), speed reducer Metal support (5) before metal support (3), shaft coupling (4), leading screw, leading screw (6), the linear guide (7), piston metallic support (8), Slidably metal support (9), feed screw nut (10), photoelectric reader (11), floating junction (12), cylinder-piston (13), Y types are close Metal support (17), flange (18), manual switch ball valve after seal (14), hydraulic cylinder (15), piston metal support (16), leading screw (19), back pressure pipe (20), nozzle (21), cylinder body water inlet line (22), cylinder body water inlet switch ball valve (23), three-way pipe (24), cylinder Switching ball (27), meter-clamping apparatus preceding switch ball valve after body outlet conduit (25), cylinder body effluent switch ball valve (26), discharge pump (28), meter-clamping apparatus (29), preceding straight pipe (30), differential pressure transmitter (31), permanent flow valve (32), rear straight pipe (33), instruction flow Count preceding switch ball valve (34), indicating flow meter (35), discharge pump (36), discharge pump preceding switch ball valve (37), test section gold Belong to holder (38), water tank (39);The stepper motor (1) is fixed on speed reducer (2), the rotation axis of stepper motor (1) with Speed reducer (2) input axle sleeve is connected, and the output shaft of speed reducer (2) is fixed by shaft coupling (4) and the end of leading screw (6) one end Connection, the end of leading screw (6) one end is later and the other end close to end and leading screw (6) is respectively arranged with leading screw axle sleeve, lead screw shaft Feed screw nut (10) is housed on the leading screw (6) between set, feed screw nut (10) is fixed on the centre of slidably metal support (9), Slidably metal support (9) lower end is connect with the linear guide (7), and slidably metal support (9) top is equipped with floating junction (12), Floating junction (12) is fixedly connected with the cylinder-piston (13) in hydraulic cylinder (15), between cylinder-piston (13) and hydraulic cylinder (15) Equipped with y-type seal ring (14);Grating scale is housed on the inside of the linear guide (7), the photoelectric reader (11) of grating scale with can Sliding metal bearing (9) is fixedly connected;The hydraulic cylinder (15) is equipped with cylinder body exhaust calibration mouth, and cylinder body exhaust calibration mouth passes through Stainless steel pipes are fixedly connected with manual switch ball valve (19) one end, manual switch ball valve (19) other end and back pressure pipe (20) one End is fixedly connected, and back pressure pipe (20) other end is fixedly connected with nozzle (21), and the water inlet of hydraulic cylinder (15) is intake by cylinder body Switching ball (23) and water tank (39) unicom;The water outlet of hydraulic cylinder (15) connects with one end of cylinder body effluent switch ball valve (26) It connects, the other end of cylinder body effluent switch ball valve (26) passes through three-way pipe (24), meter-clamping apparatus preceding switch ball valve (28) and preceding straight pipe (30) it connects, the other end of cylinder body effluent switch ball valve (26) also passes through switching ball (27) after three-way pipe (24), discharge pump It is connect with discharge pump (36), discharge pump preceding switch ball valve (37) is provided on the gas outlet of discharge pump (36);Preceding straight tube Permanent flow valve to be calibrated (32) is provided between section (30) and rear straight pipe (33), the both ends of permanent flow valve (32) are parallel with differential pressure change Device (31), rear straight pipe (33) is sent to be connect with indicating flow meter (35) by indicating flow meter preceding switch ball valve (34), instruction stream Gauge (35) is connected to water tank (39).
2. a kind of piston type liquid flow standard device according to claim 1, it is characterised in that:The cylinder-piston (13) transmission between the leading screw (6) uses parallel out-of-alignment structure type;The cylinder-piston (13) and institute It is connected by slidably metal support (9) between the leading screw (6) stated;The slidably metal support (9) with it is described straight Line guide rail (7) is slidably matched.
3. a kind of piston type liquid flow standard device using claim 1 carries out permanent flow valve the side of flow and differential pressure verification Method, it is characterised in that include the following steps:
1) permanent flow valve (32) is mounted between the preceding straight pipe (30) and the rear straight pipe (33);
2) control stepper motor (1), which rotates in the forward direction, drives speed reducer (2) to rotate in same direction, the velocity of rotation warp of stepper motor (1) Driving leading screw (6) rotates forward after speed reducer (2) slows down, by the cooperation of leading screw (6) and feed screw nut (10) by leading screw (6) Rotation be converted to slidably metal support (9) level it is positive mobile, the slidably positive movement of the level of metal support (9) pushes away Dynamic cylinder-piston (13) is horizontal positive mobile, until cylinder-piston (13) reaches hydraulic cylinder (15) bottom;
3) the manual switch ball valve (19) and cylinder body effluent switch ball valve (26) are closed, the cylinder body water inlet switch ball is opened Valve (23);
4) control stepper motor (1), which reversely rotates, drives speed reducer (2) to rotate in same direction, the velocity of rotation warp of stepper motor (1) Driving leading screw (6) rotates backward after speed reducer (2) slows down, by the cooperation of leading screw (6) and feed screw nut (10) by leading screw (6) Rotation be converted to the horizontal reverse movement of slidably metal support (9), slidably the horizontal reverse movement of metal support (9) is dragged The dynamic horizontal reverse movement of cylinder-piston (13), until cylinder-piston (13) reaches hydraulic cylinder (15) head;In cylinder-piston (13) Make in horizontal reversed moving process, the water in water tank (39) passes through cylinder body water inlet switch ball valve (23) and cylinder body water inlet line (22) Into hydraulic cylinder (15);
5) switching ball (27) after the cylinder body water inlet switch ball valve (23) and discharge pump is closed, the cylinder body is opened and is discharged Switching ball (26), meter-clamping apparatus preceding switch ball valve (28) and indicating flow meter preceding switch ball valve (34), open simultaneously permanent flow valve (32);
6) step 2) is executed, the air in cylinder body outlet conduit (25) is excluded clean;
7) the cylinder body effluent switch ball valve (26) is closed;
8) the cylinder body water inlet switch ball valve (23) is opened, step 4) is executed;
9) the cylinder body water inlet switch ball valve (23) is closed, the manual switch ball valve (19) is opened;
10) step 2) is executed, the air in hydraulic cylinder (15) is excluded;
11) the manual switch ball valve (19) is closed;
12) step 8) is executed repeatedly to step 11), the air in the hydraulic cylinder (15) is excluded clean;
13) switching ball (27) and discharge pump preceding switch ball valve (37) after the opening discharge pump, start discharge pump (36), by the permanent flow valve (32) gas in the duct exclude it is clean;
14) discharge pump (36) is shut down, switching ball (27) and discharge pump preceding switch after the discharge pump are closed Ball valve (37);
15) step 8) is executed, the cylinder body water inlet switch ball valve (23) is closed, opens the cylinder body effluent switch ball valve (26);
16) permanent flow valve (32) both ends target differential pressure is set by control computer, starts the stepper motor (1) and makees forward direction Rotation drives speed reducer (2) to rotate in same direction, and the velocity of rotation of stepper motor (1) drives leading screw (6) after speed reducer (2) deceleration It rotates forward, the rotation of leading screw (6) is converted to by slidably metal support by the cooperation of leading screw (6) and feed screw nut (10) (9) level is positive mobile, and slidably the level forward direction of metal support (9) is mobile pushes the horizontal positive shifting of cylinder-piston (13) Dynamic, the water in hydraulic cylinder (15) is discharged by the horizontal positive movement of the cylinder-piston (13) by pipeline where permanent flow valve (32) Water tank (39);When the water being discharged in the hydraulic cylinder (15) is by permanent flow valve (32), produced at described permanent flow valve (32) both ends Raw differential pressure, the differential pressure are introduced into differential pressure transmitter (31) by pressure guiding pipe, and the differential pressure transmitter (31) turns differential pressure signal It is changed to current signal and is sent into control computer, it is actually poor that current signal is scaled permanent flow valve (32) both ends by control computer again Pressure, and compared with the target differential pressure of the permanent flow valve of setting (32) both ends, control signal controling stepping motor (1) rotating speed is generated, directly To the practical differential pressure in permanent flow valve (32) both ends close to target differential pressure, then control computer control stepper motor (1) at the uniform velocity rotates, together When start the pulse signal fed back to photoelectric reader (11) and carry out chronoscope frequency, and to the electric current of differential pressure transmitter (31) feedback Signal is acquired;
17) timing time that chronoscope frequency is carried out in the pulse signal fed back to photoelectric reader (11) reaches the most short of setting After timing time, stops the chronoscope frequency of pulse signal feed back to photoelectric reader (11) and differential pressure transmitter (31) is fed back The acquisition of current signal;It is simultaneously stopped stepper motor (1) operation;
18) when carrying out the accumulation that chronoscope frequency obtains to the pulse signal that photoelectric reader (11) is fed back according to control computer Between and cumulative number of pulses, by formulaCalculate the average flow rate of piston type liquid flow standard device:
Q i=(3.14×d 2/4×P i×N i)/t i
FormulaIn,Q iFor the average flow rate of piston type liquid flow standard device;dFor cylinder-piston (13) overall diameter;P iFor photoelectricity The pulse equivalency of the pulse signal of reading head (11) feedback;N it iRespectively control computer feeds back photoelectric reader (11) Pulse signal carries out the cumulative number of pulses and accumulated time that chronoscope frequency obtains;
Due to the continuity of liquid flowing, the average flow rate of piston type liquid flow standard device is permanent flow valve (32) flow;
19) current signal of differential pressure transmitter (31) feedback collected according to control computer, by formulaCalculate permanent flow valve (32) differential pressure at both ends:
⊿p i=[⊿p max×(I i-4)]/16
FormulaIn,⊿p iTo measure the differential pressure at obtained permanent flow valve (32) both ends;⊿p maxFor differential pressure transmitter (31) range;I iFor The current signal for differential pressure transmitter (31) feedback that control computer collects;
20) according to the flow of permanent flow valve (32) and the distance of cylinder-piston (13) horizontal movement, judge stepper motor (1) Whether can continue to rotate in same direction:If can continue to rotate in same direction, repeatedly step 16) to step 19) completes constant current The verification of valve (32) flow and differential pressure;If cannot be further continued for rotating in same direction, thens follow the steps and 15) complete perseverance to step 19) Flow flow and the differential pressure verification of valve (32);
21) verification of the step 20) completion to permanent flow valve (32) flow and differential pressure is repeated.
CN201610120739.5A 2016-03-04 2016-03-04 A kind of method of the standard set-up and verification of permanent flow valve flow and differential pressure verification Expired - Fee Related CN105784341B (en)

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CN109405937B (en) * 2018-12-26 2024-04-30 浙江省计量科学研究院 Wide-range ratio water meter calibration standard device and water meter calibration method thereof
CN112309216A (en) * 2020-09-27 2021-02-02 东南大学 Generating system capable of continuously outputting pulsating flow

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DE10017864A1 (en) * 2000-04-11 2001-10-18 Abb Patent Gmbh Testing water meters, involves determining pipeline and water meter hydraulic resistance and hydraulic resistance of at least one valve depending on control voltage before setting flow value
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