CN102305688B - Multi-range on-site full-automatic pressure calibrator - Google Patents
Multi-range on-site full-automatic pressure calibrator Download PDFInfo
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Abstract
The invention discloses an on-site full-automatic pressure calibrator. The on-site full-automatic pressure calibrator comprises a shell, a power supply switch, a plurality of interfaces, a display, control components such as a keyboard and the like, a gas pressure generation unit, a power supply unit, a pressure detection unit and a gas pressure control unit, wherein the gas pressure generation unit is a miniature gas pressure pump which is communicated with atmosphere; the pressure output ends of the pressure control unit are communicated in parallel and are used for accommodating a pressure standard machine with multiple ranges and a pressure joint of a meter to be detected; the pressure control unit is connected with the pressure standard machine in the pressure detection unit through signals; and a battery can supply power to the power supply unit. The on-site full-automatic pressure calibrator does not need external gas cylinders or alternating current (AC) power supplies, can automatically generate gas pressure and accurate standard pressure, has light self weight and small volume, is convenient to carry on site, is suitable for various meters to be detected, and can automatically calibrate various on-site pressure meters.
Description
Technical field
The invention belongs to the measurement and calibration field of pressure tool instrument, relate generally to the auto-calibration in this field, particularly relate to a kind of being easy to carry to the scene, manometer is calibrated the also auto-calibration equipment of changeable standard range.
Background technology
The tensimeter that uses in the fields such as commercial production, pressure survey in use for some time, all will carry out field-checking or calibration to it, to determine whether this tensimeter is accurate.
Common pressure calibration instrument is in the pressure calibration pipeline of a certain sealing, produces gaseous tension by manual pressure, and reads the manometer indicating value by observation, by the manual pressure mode, gaseous tension is regulated.The effect of its adjusting is at the Output pressure port, and a certain gaseous tension accurately is provided, and as normal pressure, access is calibrated manometer with it, is used for various manometers are calibrated.
This traditional personnel observation, manual pressure is regulated the pressure calibration mode of pressure, and observational error is large, wastes time and energy.Especially in industry spot or in the slight pressure scope, when carrying out pressure detection, manual adjustments pressure is difficult for stable, and it is larger that observation is affected by the artificial interference factor, and work efficiency is low.
In order to address this problem, improve the work efficiency of pressure detection, in recent years, offshore company has developed common pressure controller.This pressure controller and external gas cylinder have together consisted of an apparatus system.In the pressure calibration pipeline of sealing, according to set pressure, provide gaseous tension by gas cylinder, by the automatic monitoring of pressure transducer and the automatic control of pressure governor, a certain set pressure output is provided, and access is calibrated manometer, is used for manometer is carried out automatic calibration.This method has overcome the shortcoming of personnel's observation and manual pressure adjusting pressure, can automatically monitor and regulate pressure, has significantly improved work efficiency.
But common pressure controller is large due to own vol, adopt ac power supply, the long-pending large and place restriction etc. that is subjected to the gas cylinder chemical gas of external gas bottle, and pressure controller can not carry.For a large amount of on-the-spot manometers that use, exist and to implement at the scene the shortcoming of calibrating.
On the other hand, in existing pressure controller, generally adopt a pressure transducer as standard, be attached in instrument in sensor.In existing pressure controller, the situation that adopts two pressure transducers is arranged also, as pressure standard meter, another is used for atmospheric pressure measurement with one.The sort of situation no matter, range is all single, make pressure survey and the range of control of instrument be limited, for some measurement range, unless adopt the pressure controller of an other corresponding range, otherwise accuracy of measurement is subject to the impact of range, needs the pressure controller equipment of many multiple ranges during the build-up of pressure calibrating indicating instrument, makes troubles for Site Detection.
Summary of the invention
The purpose of this invention is to provide a kind of robotization normal pressure correcting device that is easy to carry, is suitable for using in industry spot that can overcome above defective is Multi-range on-site full-automatic pressure calibrator.
For achieving the above object, the present invention takes following technical scheme:
a kind of on-the-spot Full-automatic pressure calibration instrument, it comprises housing, be combined in the power switch of housing appropriate location, a plurality of interfaces, display, operating elements such as keyboard and be combined in gaseous tension generating unit in housing, power supply unit and pressure sensing cell, also comprise the gaseous tension control module, described gaseous tension generating unit is an open to atmosphere gas boosting pump of company, the described gaseous tension control module of its Output pressure pipeline communication, the in parallel connection of the pressure output end of pressure control unit is used for installing the pressure standard meter of pressure sensing cell and the compression fittings of tested table, described pressure standard meter is the standard scale of the different ranges that can manually change or the modular pressure of switchable a plurality of different ranges, pressure control unit is connected with pressure standard meter signal in pressure sensing cell, and power supply unit is electrically connected to pressure standard meter in gaseous tension generating unit, pressure control unit and pressure sensing cell respectively.Wherein:
Described gas boosting pump comprises motor, excentric shaft, fork, the pump housing, left and right two cylinder bodies, piston rod and the check valve body and the cylinder cap that are connected with two cylinder bodies; The pump housing is link, and motor is fixed on the pump housing, and motor shaft stretches into the pump housing and is connected with excentric shaft; Excentric shaft is cylindric, and an end passes a mounting hole of flat fork with the drive pin that deviates from the axle center by drive pin; Fork is connected on horizontally disposed piston rod by screw; Piston rod is cylindric, and its two ends are equipped with O-ring seal and stretch into respectively left and right two cylinder bodies; Cylinder body is cylinder-like structure, and two cylinder bodies are arranged on respectively the two ends of the pump housing; Two cylinder body outer ends are installed check valve body and cylinder cap more successively, and check valve body is communicated with inner chamber of cylinder block, and are communicated with outside air or compressed air piping by the passage of cylinder cap.
In the gas boosting pump, described piston rod forms sealing by the O-ring seal that is arranged on two ends at inboard wall of cylinder block; Fork swing to drive piston rod in two cylinder bodies along the axis to-and-fro movement;
In the gas boosting pump, two reverse check valve body are all installed at two ends, cylinder body left and right, and one of them check valve body is communicated with outside air, and another check valve body is communicated with compressed air piping.
In the gas boosting pump, described check valve body is assembled by cavity sealing, elasticity arm, metal gasket and O-ring seal, and wherein, elasticity arm is extended internally by the cavity sealing, and is connected the bottom fixed seal ring of metal gasket with the upper end of metal gasket.
Above on-the-spot Full-automatic pressure calibration instrument, described power supply unit are battery self-contained electric system or external power supply.
Described pressure control unit comprises pressure controller and Single Chip Microcomputer (SCM) system; Wherein: the air path part of pressure controller comprises gas admittance valve, impact damper, minute-pressure governor motion, vent valve and a normal pressure output terminal, and the normal pressure output terminal is established two compression fittings in parallel; Gas admittance valve is communicated with the gases at high pressure output pipe of gas boosting pump, impact damper is one and is used for pressure chamber stable and that store the pressed gas of being exported by gas admittance valve, the outlet side of impact damper is communicated with the cylinder in described minute-pressure governor motion, plunger in this cylinder is connected with a screw mechanism, vent valve is installed on the Output pressure pipeline and is communicated with atmosphere in order to emission gases pressure, and the normal pressure output terminal is in parallel with vent valve to be installed on the Output pressure pipeline; The control section of pressure controller comprises a pressure controlling driving circuit; This circuit is electrically connected to power supply unit, and is connected with gas admittance valve, vent valve and screw mechanism signal; Single Chip Microcomputer (SCM) system comprises the control chip that is loaded with the pressure control algolithm, and configures a plurality of interfaces; Control chip is connected with the pressure controlling driving circuit, exports normal pressure accurately by driving circuit controlled pressure output pipe.A plurality of interfaces of described Single Chip Microcomputer (SCM) system configuration are digital communication interface, display interface device, the keyboard interface that is connected with pressure standard meter and the RS232 interface that is connected with external equipment.The exhaust end of described vent valve also is equiped with exhaust box.
In above on-the-spot Full-automatic pressure calibration instrument, described pressure standard meter is standard scale, can be precision digital tensimeter, digital pressure calibration instrument or intelligent digital pressure calibration instrument.
In above on-the-spot Full-automatic pressure calibration instrument, described pressure standard meter is the modular pressure of a plurality of different ranges, solenoid valve by separately is communicated with respectively a compression fittings in described pressure controller normal pressure output terminal, and described solenoid valve is by a controlled chip controls of valve commutation circuit; Also comprise modular pressure output signal switching device in described Single Chip Microcomputer (SCM) system, each modular pressure output signal is given control chip via digital communication interface with data by this switching device.
The present invention has following characteristics owing to taking above design:
(1) need not outer interchange power supply, the scene is easy to carry;
(2) need not external gas cylinder, dwindled weight and volume, the scene is easy to carry;
(3) the on-the-spot continued power feature of battery, can implement pressure calibration at the scene;
(4) can be for the manometer automatic calibration of variety classes and multiple range.
It need not external gas cylinder and AC power, and gaseous tension can occur automatically.In the pressure calibration pipeline of sealing, by to automatic measurement and the regulating and controlling of pressure occur certainly, at the Output pressure port, occur or produce a certain gaseous tension accurately, it as normal pressure, is offered and be calibrated manometer.It adopts self powered battery, need not external AC power supply.It also adopts the micro pressure pump generation gaseous tension of self, offers the pressure calibration loop, need not external gas cylinder.So greatly dwindled own wt and volume, the scene is easy to carry; Be equipped with the different standard scale of a plurality of ranges, can carry out the replacing of corresponding range standard scale for different pressure detection scopes, be convenient to adapt to the configuration of different user; The working pressure module is as pressure criteria spare, can in be attached in controller, be easy to carry, be easy to realize the instrument portable characteristics, and in parallel switching of the modular pressure of different ranges used, equally can be conveniently to the calibration of the tested table of different ranges.Comprehensive, the present invention implements field calibration for a large amount of on-the-spot manometers that use, thereby can carry out auto-calibration to the various field manometer when realizing the auto-calibration manometer, significantly improving work efficiency.
Description of drawings
Fig. 1 is the on-the-spot Full-automatic pressure calibration instrument arrangement plan of the present invention.
Fig. 2 is inner body pie graph of the present invention.
Fig. 3 is that in Fig. 2, pressure control unit consists of and and other unit connection relation figure.
Fig. 4 is preferred micro pressure pump configuration figure in the present invention.
Fig. 5 is the one-way valve structures figure that is preferred in the present invention in the micro pressure pump.
Fig. 6 is for being used for the present invention's power supply/charge control circuit.
Embodiment
Referring to Fig. 1, Fig. 2 and Fig. 3, on-the-spot Full-automatic pressure calibration instrument provided by the present invention, comprise a housing 9, be assembled in respectively gaseous tension generating unit 1, pressure control unit 2, power supply unit 3 and pressure sensing cell 4 in housing 9, be placed in display screen 91, the keyboard 92 of housing 9 the tops and conveniently use and appropriate electric signal delivery outlet 93, power switch 94 and the RS232 interface 95 etc. that distribute; A plurality of storage tanks (omitting in figure) also are set in housing 9 inner spaces are used for installing the standby standard scale of changing of different ranges.Wherein, the gaseous tension generating unit 1 open to atmosphere gas circuit input end of the company of establishing (inlet end) 96, its output terminal is communicated with pressure control unit 2, and the gas circuit output terminal 29 of pressure control unit 2 is communicated with pressure sensing cell 4 (in Fig. 2, thick line represents that gas circuit connects); Pressure control unit 2 also is connected respectively (in Fig. 2, fine rule represents that data-signal connects) for pressure control with gaseous tension generating unit 1, pressure sensing cell 4 signal wires; Power supply unit 3 is connected (the medium-coarse lines in Fig. 2 represent that power lead connects) for power supply with pressure generating unit 1, pressure control unit 2 and pressure sensing cell 4 with electric wire respectively.Wherein:
Gaseous tension generating unit 1 is by a gas boosting pump generation gaseous tension, and air lift pump directly is communicated with atmosphere, produces gaseous tension by pressurized air, need not external gas cylinder.In theory, any can all can use in the present invention by the air pump that pressurized air produces gaseous tension, the preferential independently developed gas boosting pump of request for utilization people in the present invention.This gas boosting pump has Self-pressurizing agri, moulding pressure is high and the functional characteristic of high-level efficiency pressurization, and has adopted high pressure retaining valve technology.
The gas boosting pump that is used for the present invention is high-pressure bidirectional miniature power-driven air pump (micro pressure pump), its structure is shown in Figure 4, comprise motor 11, excentric shaft 12, fork 13, the pump housing 14, left cylinder 15 and right cylinder body 15 ', check valve body 16 and piston rod 10, wherein: the pump housing 14 is link, motor 11 is fixed on the pump housing 14 by electric machine support 112, and motor shaft stretches under the pump housing 14 by shaft coupling 113 and links together with excentric shaft 12; Excentric shaft 12 is cylindric, and an end is with the drive pin 121 that deviates from the axle center, and drive pin 121 passes a mounting hole of flat fork 13; Another mounting hole that screw 111 passes fork 13 is connected in fork 13 on the piston rod 10 of horizontal direction; The gap of fork 13 and piston rod 10 can be regulated voluntarily by the mounting distance that screw 111 provides; Piston rod 10 is cylindrical-shaped structure, and at its two ends, O-ring seal 19 is installed; Left cylinder 15 and right cylinder body 15 ' are stretched into respectively in piston rod 10 two ends; Cylinder body is cylinder-like structure, and two cylinder bodies 15 and 15 ' are arranged on respectively the two ends of the pump housing 14; Piston rod 10 forms sealing by the O-ring seal 19 that is arranged on two ends at cylinder body 15 and 15 ' inwall; The cylinder body 15 at two ends and 15 ' symmetric double are after assembling, fork 13 drives piston rod 10 along the axis to-and-fro movement when swinging, the O-ring seal 19 at two ends becomes piston rod 10 guide collar simultaneously, has realized the mode of Self-aligning guiding on structure, has realized air pump transmission and sealing; Two cylinder bodies 15 and 15 ' outer end are installed cylinder pad 18, check valve body 16 and cylinder cap 17 more successively, are fixedly mounted on the two ends of the pump housing 14; Two reverse check valve body 16 are installed respectively at its middle pump body 14 two ends, check valve body 16 is communicated with cylinder body 15 and 15 ' inner chamber, and be communicated with outside air or compressed air line by the passage of cylinder cap 17, the installation of check valve body 16 is identical with air inlet and the outgassing direction of Fig. 4 and Fig. 5.
Here, check valve body 16 structures are referring to Fig. 5, it comprises cavity sealing 161, elasticity arm 162, metal gasket 163 and O-ring seal 164, wherein, cavity sealing 161 is loop configuration, is outer support and the sealing of total, be installed on the interplanar (between cylinder cap and cylinder body) of two needs sealings, form seal chamber, also the sealing of structure as a whole, make with elastic material; Elasticity arm 162 utilizes the elasticity of its rubber to stretch, elasticity arm 162 bottoms and metal gasket 163 top butts for by cavity sealing 161 list structures that extend internally; Metal gasket 163, be shaped as discoid, the expression in the eyes end that upper, annular draw-in groove 131 is used for inlaying elasticity arm 162 makes it be stuck in this draw-in groove 131 and makes below elasticity arm 162 with metal gasket 163 tops and connects, and an annular groove 132 is established in the bottom of metal gasket 163, places O-ring seal 164 in it; O-ring seal 164 is " O " RunddichtringO of standard, is fixed in the lower recess 132 of metal gasket 163.In installation, the airintake direction of check valve body 16, outgassing direction are consistent with the inlet, outlet direction shown in micro pressure pump 1 (Fig. 4), form one-way air inlet: when gases at high pressure are discharged (exhaust), cylinder body 15 pistons 10 make the gas in the jar compression to left movement, be loaded on retaining valve 16 work of below, the metal gasket 163 that promotion studs with " O " RunddichtringO 164 1 sides moves (direction moves by giving vent to anger), O-ring seal also moves thereupon, check valve body 16 is in open mode, and the gases at high pressure of compression are pushed in the gases at high pressure output pipe by gas passage; In cylinder body 15 inner piston rod 10 backstrokes, elasticity arm 162 drives metal gasket 163 counter motions (pressing the reverse of air inlet direction), compresses seal 164 makes it to produce flat seal, and gases at high pressure are closed in needed cavity like this, has completed the requirement of sealing high pressure.When outside air sucks (air-breathing), cylinder body 15 pistons 10 move right and make gas in the jar form negative pressure, be loaded on retaining valve 16 work of top, the metal gasket 163 that promotion studs with " O " RunddichtringO 164 1 sides moves (moving by Fig. 5 outgassing direction), O-ring seal also moves thereupon, check valve body 16 is in open mode, and outside air is inhaled in cylinder body 15 by gas passage; Gases at high pressure and external environment condition are kept apart in cavity sealing 161 in whole process, and elasticity arm 162 support metal pads 163 and 1 O-ring seal 64 by being attached thereto, form integral sealing simultaneously.Owing to there being two check valve body 16 oppositely to install mutually at the every end of the pump housing 14, a control is air-breathing, and another controls exhaust, forms like this direction motion of gas in the to-and-fro movement of piston 10, produces pressure gas when gas is placed on confined space.
This structure mini forcing pump is in when work, and motor 11 drives excentric shafts 12 and rotates, and the drive pin on excentric shaft 12 pulls piston rod 10 by fork 13 and screw 111, makes the piston rod 10 can to-and-fro movement.The O-ring seal 19 that piston rod 10 is installed by two ends forms sealing with cylinder body 15; Take left hand cylinder partly as example, the production process of gases at high pressure is described: when piston rod 10 moves to the right, the space of cylinder body 15 inside, left side increases rapidly, in the inner negative pressure that forms of cylinder body 15, make the check valve body 16 of left upper portion be in suction condition (oppositely placing nonreturn valve core opens), outside air is inhaled into cylinder body 15, and fork 13 runs to the right side extreme position, the check valve body 16 that should oppositely place is closed, and completes breathing process; When piston rod 10 during to left movement, the sealing gas of cylinder body 15 inside, left side is compressed, pressure progressively raises, make the check valve body 16 of bottom, left side be in exhaust condition (forward is placed nonreturn valve core and opened), pressurized air is discharged, move to the left side extreme position, the check valve body 16 that this forward is placed is closed, and completes exhaust (output high pressure compressed gas) process.Driven by motor excentric shaft 12, then drive piston rod 10 to-and-fro movements by fork 13, breathing process and exhaust process constantly repeat, and gas is constantly compressed, produces gases at high pressure.Cylinder 15 and 15 ' can be completed twice from extraneous air amount in a circulation and pressure gas discharge in cylinder and symmetric double is to placing, and has also improved efficient.
Gaseous tension generating unit 1 produces end for the high pressure in the present invention, utilize the micro pressure pump from extraneous air amount, pressurized air and pressure gas is gone out to produce high pressure by row of conduits, coordinate again pressure controller and pressure standard meter to realize real-time measurement and the transmission of pressure, by automatic measurement and the regulating and controlling to pressure, occur or produce a certain gaseous tension accurately at the Output pressure port, it as normal pressure, is offered and be calibrated manometer.
Single Chip Microcomputer (SCM) system comprises control chip 28 and the display interface device of embedding, keyboard interface and digital communication interface, also can establish RS232 interface 95, the pressure control algolithm (special-purpose Adaptive PID Control algorithm as is well known) that embeds in controller chip 28, the digital communication interface of this Single Chip Microcomputer (SCM) system, when the normal pressure device is standard scale, can directly receive the pressure value that standard scale 60 shows and returns, and when the normal pressure device is a plurality of modular pressures (range is different), by module switching device (as steady arm), the pressure value of oriented modular pressure 61 or 62 is returned to control chip 28 by digital communication interface, by with chip in predefined force value compare, the pressure control algolithm is carried out controlled quentity controlled variable according to difference and is calculated, and the controlled quentity controlled variable of calculating is flowed to pressure controlling driving circuit 20 again, realized gas admittance valve 21 by pressure controlling driving circuit 20, the control of vent valve 24 and minute-pressure governor motion 23, implement the FEEDBACK CONTROL that pressure accurately occurs, control chip 28 has formed the Output pressure control module with pressure controlling driving circuit 20, valve commutation circuit 30 and pressure standard meter 6, carries out the real-time control of Output pressure, control chip 28 and pressure controlling driving circuit 20, measurement instrument 7, Single Chip Microcomputer (SCM) system externally connected with display screen 91 and keyboard 92 have formed the pressure testing and controlling unit, by keyboard 92 input set pressure and program control operation data parameters, show pressure control result and curve by standard scale 60 or display screen 91.RS232 interface 95 gives in testing environment with good conditionsi and uses, and can be connected with other external equipment such as external computing machine (shown in Figure 2), printer etc.
Thus, pressure control unit is in the pressure calibration pipeline of sealing, by the meticulous adjusting of multichannel pressure regulating and controlling valve (gas admittance valve, vent valve) and minute-pressure governor motion, gaseous tension is carried out setup control, export gaseous tension accurately at the Output pressure port.Export gas pressure value accurately according to this, accurately calibrate being calibrated tensimeter.
In the present invention, battery-powered unit used can be conventional DC power-supply system; the electric power system of control function that preferably has powered battery monitoring, control and protection, battery-powered and charging; wherein use the power supply/charge control circuit in ZL200620119089.4 " a kind of power supply-charging circuit "; shown in Figure 6; wherein the AC/DC power end is connected with external power supply; the instrument power supply end is current output terminal, presses shown in Figure 2 respectively to other unit power transmission in pressure testers.This power supply unit can be guaranteed the DC good electrical property, is interrupted without power supply; Charging performance to battery is good, makes battery use safety, long working life, and it is accurate, safe and reliable to make it to detect for pressure testers, longevity of service, the on-the-spot use is easy to carry.
Pressure sensing cell 4, at least the pressure standard meter that comprises two kinds of ranges, so that the tested table to different ranges all can be calibrated, pressure standard meter 6 is installed on one of the pressure output end 29 of pressure controller compression fittings 26, and tested table 7 is installed on pressure output end 29 another compression fittings 27 of pressure controller.Pressure standard meter 6 can be precision digital tensimeter, digital pressure calibration instrument, (absolute pressure) digital pressure gauge or intelligent digital pressure calibration instrument, and general designation standard scale 60 also can be modular pressure (pressure transducer 61 and 62); As be standard scale, need to be equipped with the standard gauge outfit of the different ranges of polylith, sentence manual mode at compression fittings 26 and change; As be modular pressure, a plurality of modular pressures 61 or 62 can set firmly by the solenoid valve 31 or 32 that connects separately and be communicated with compression fittings 26.On pressure standard meter 6 (standard scale or modular pressure) cut-in pressure joint 26, for different pressure limits, change the pressure standard meter of corresponding range (as shown in fig. 1, can use with solid line and represent the modular pressure that is communicated with, also can change and use the standard scale that is represented by dotted lines connection) make not circumscribed of pressure survey and range of control, accuracy of measurement is not subjected to the impact of range.Pressure standard meter 6 is connected (referring to Fig. 3) with the pressure controller signal, in the pressure calibration loop of sealing, gas circuit pressure is measured (observation) in real time, data with its continuous pressure measurement, real-time Transmission is to control chip 28, be used for output pressure is controlled in real time, and with the final measurement result of controlling of a certain pressure set-point, as the standard value of pressure calibration, be used for the assignment to outputting standard pressure, shown by display screen.
Above each unit connects each other and is assembled in housing, each unit put that there is no particular restriction (shown in Figure 1 only be a kind of concrete assembling form), use as principle with convenient, can be directly arranged in surface of shell as display, keyboard and power switch, signal delivery outlet, RS232 interface etc., the inlet end 96 of gases at high pressure generating unit 1, the exhaust end 24 of pressure controller 2, compression fittings 26 and normal pressure device 6, compression fittings 27 and tested table 7 stretch out respectively outside housing 9; Certainly the accessory that lid, handle, braces etc. are convenient for carrying be can also establish on housing, compact conformation, portable on-the-spot Full-automatic pressure calibration instrument formed with this.
The on-the-spot Full-automatic pressure calibration instrument of the present invention need not external gas cylinder, the gaseous tension generating unit produces pressurized air, in the pressure calibration pipeline of input pressure controller sealing, by the gaseous tension control module, the gaseous tension that certainly occurs is measured and regulating and controlling automatically, at the Output pressure port, export a certain gaseous tension accurately, it is offered as normal pressure be calibrated manometer, implement the Measurement and calibration of pin-point accuracy; It adopts self powered battery, need not external AC power supply.This Full-automatic pressure calibration instrument is being realized the auto-calibration manometer, when significantly improving work efficiency, has greatly dwindled own wt and volume, and field calibration can be implemented for a large amount of on-the-spot manometers that use in the scene that is easy to carry.
Claims (9)
1. Multi-range on-site full-automatic pressure calibrator, it comprises housing, be combined in the power switch of housing appropriate location, a plurality of interfaces, display and keyboard, and be combined in gaseous tension generating unit in housing, power supply unit and pressure sensing cell, it is characterized in that: also comprise the gaseous tension control module, described gaseous tension generating unit is an open to atmosphere gas boosting pump of company, the described gaseous tension control module of its Output pressure pipeline communication, two compression fittings of the pressure output end of pressure control unit connection in parallel, one of them compression fittings is used for the tested table of installing pressure sensing cell, another compression fittings is used for the pressure standard meter of installing pressure sensing cell, described pressure standard meter is the standard scale of the different ranges that can manually change or the modular pressure of switchable a plurality of different ranges, pressure control unit is connected with pressure standard meter signal in pressure sensing cell, and power supply unit is electrically connected to pressure standard meter in gaseous tension generating unit, pressure control unit and pressure sensing cell respectively,
Described pressure control unit comprises pressure controller and Single Chip Microcomputer (SCM) system; Wherein:
The air path part of pressure controller comprises gas admittance valve, impact damper, minute-pressure governor motion, vent valve and a normal pressure output terminal, and the normal pressure output terminal is established two compression fittings in parallel; Gas admittance valve is communicated with the gases at high pressure output pipe of gas boosting pump, impact damper is one and is used for pressure chamber stable and that store the pressed gas of being exported by gas admittance valve, the outlet side of impact damper is communicated with the cylinder in described minute-pressure governor motion, plunger in this cylinder is connected with a screw mechanism, vent valve is installed on the Output pressure pipeline and is communicated with atmosphere in order to emission gases pressure, and the normal pressure output terminal is in parallel with vent valve to be installed on the Output pressure pipeline;
The control section of pressure controller comprises a pressure controlling driving circuit; This circuit is electrically connected to power supply unit, and is connected with gas admittance valve, vent valve and screw mechanism signal;
Single Chip Microcomputer (SCM) system comprises the control chip that is loaded with the pressure control algolithm, and configures a plurality of interfaces; Control chip is connected with the pressure controlling driving circuit, exports normal pressure accurately by driving circuit controlled pressure output pipe.
2. Multi-range on-site full-automatic pressure calibrator as claimed in claim 1, is characterized in that, described gas boosting pump comprises motor, excentric shaft, fork, the pump housing, left and right two cylinder bodies, piston rod and the check valve body and the cylinder cap that are connected with two cylinder bodies, wherein:
The pump housing is link, and motor is fixed on the pump housing, and motor shaft stretches into the pump housing and is connected with excentric shaft;
Excentric shaft is cylindric, and an end passes a mounting hole of flat fork with the drive pin that deviates from the axle center by drive pin;
Fork is connected on horizontally disposed piston rod by screw;
Piston rod is cylindric, and its two ends are equipped with O-ring seal and stretch into respectively left and right two cylinder bodies;
Cylinder body is cylinder-like structure, and two cylinder bodies are arranged on respectively the two ends of the pump housing;
Two cylinder body outer ends are installed check valve body and cylinder cap more successively, and check valve body is communicated with inner chamber of cylinder block, and are communicated with outside air or compressed air piping by the passage of cylinder cap.
3. Multi-range on-site full-automatic pressure calibrator as claimed in claim 2, is characterized in that, described piston rod forms sealing by the O-ring seal that is arranged on two ends at inboard wall of cylinder block; Fork swing to drive piston rod in two cylinder bodies along the axis to-and-fro movement.
4. Multi-range on-site full-automatic pressure calibrator as claimed in claim 2, is characterized in that, two reverse check valve body are all installed at two ends, cylinder body left and right, and one of them check valve body is communicated with outside air, and another check valve body is communicated with compressed air piping.
5. Multi-range on-site full-automatic pressure calibrator as claimed in claim 4, it is characterized in that, described check valve body is assembled by cavity sealing, elasticity arm, metal gasket and O-ring seal, wherein, elasticity arm is extended internally by the cavity sealing, and be connected the bottom fixed seal ring of metal gasket with the upper end of metal gasket.
6. Multi-range on-site full-automatic pressure calibrator as claimed in claim 1, is characterized in that, described power supply unit is battery self-contained electric system or external power supply.
7. Multi-range on-site full-automatic pressure calibrator as claimed in claim 1, it is characterized in that, a plurality of interfaces of described Single Chip Microcomputer (SCM) system configuration are digital communication interface, display interface device, the keyboard interface that is connected with pressure standard meter and the RS232 interface that is connected with external equipment.
8. described Multi-range on-site full-automatic pressure calibrator as arbitrary in claim 1 to 7, it is characterized in that, described pressure standard meter is the modular pressure of a plurality of different ranges, solenoid valve by separately is communicated with respectively a compression fittings in described pressure controller normal pressure output terminal, and described solenoid valve is by a controlled chip controls of valve commutation circuit; Also comprise the modular pressure switching device in described Single Chip Microcomputer (SCM) system, each modular pressure is exported to control chip via digital communication interface with data by this switching device.
9. described Multi-range on-site full-automatic pressure calibrator as arbitrary in claim 1 to 7, is characterized in that, described standard scale is precision digital tensimeter or digital pressure calibration instrument.
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| CN103808294B (en) * | 2012-11-15 | 2018-08-14 | 中国科学院沈阳自动化研究所 | Depth gauge demarcates detection device |
| US9640344B2 (en) * | 2014-02-07 | 2017-05-02 | Good Day Tools Llc | Portable pressure switch calibration and diagnostic tool |
| CN105547575A (en) * | 2016-01-25 | 2016-05-04 | 广东菲柯特电子科技有限公司 | Tire pressure instrument detection system |
| US10976211B2 (en) | 2016-07-22 | 2021-04-13 | Beijing Const Instruments Technology Inc. | Fully-automated handheld pressure calibrator |
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| CN102305688A (en) | 2012-01-04 |
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