CN104897331A - Wide-range air performance detection system and method for household electrical appliances - Google Patents
Wide-range air performance detection system and method for household electrical appliances Download PDFInfo
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- CN104897331A CN104897331A CN201510320326.7A CN201510320326A CN104897331A CN 104897331 A CN104897331 A CN 104897331A CN 201510320326 A CN201510320326 A CN 201510320326A CN 104897331 A CN104897331 A CN 104897331A
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Abstract
The invention discloses a wide-range air performance detection system and method for household electrical appliances, and the system comprises an air performance measurement device, a first differential pressure transmitter, a second differential pressure transmitter, a third differential pressure transmitter, a first protection solenoid valve, a second protection solenoid valve, a first relay control circuit, a second relay control circuit, a barometric pressure transmitter, a temperature sensor, a six-channel A/D conversion digital display meter, an upper computer, a to-be-detected electric appliance, and a connecting pipe. The system employs three pressure transmitters with different ranges to be combined for measurement, employs a modification value line pair to achieve correction and modification, improves the accuracy of measurement, and enlarges the measurement range. A design that a diffusion segment can be replaced is employed, thereby achieving the detection of different household electrical appliances through one system, and reducing the cost of hardware. The system employs multi-point static pressure ports, and reduces the impact on a structure from the arrangement of a pressure-sharing grid.
Description
Technical field
The invention belongs to the air performance detection technique category of household electrical appliance series products, particularly relate to free air inlet, the air device for detecting performance system that electric appliances product given vent to anger by pipeline and method thereof.
Background technology
In household electronic products, have some products to be mainly used in room conversion that is indoor or locally flue gas, typical products is range hood, scavenger fan etc. such as.Recent years, integrated kitchen range, is exactly by electric type product integrated for the kitchen appliance product of the range hood, disinfection cabinet and so on of gas-cooker or electromagnetic stove, lower-discharging type, develops rapidly.At present, the annual production of these electric equipment products of China and sales volume all very large.The year sales volume about 100,000,000 of scavenger fan, range hood sales volume about 1,000 ten thousand, the sales volume moon in integrated kitchen range year 1000000, output and sales volume are the first in the world.But this series products has a common feature: the airflow form that it all have employed free air inlet, pipeline is given vent to anger, therefore the air performance index of this series products evaluate the main index of its performance, effect quality.For the sound development that the industry of this series products of specification is orderly, the unified detection method to the technical indicator of air performance, competent authorities' priority of country and industry is formulated and has been promulgated a series of technical manual and standard: GB/T17713-2101 " range hood ", GB/T14806-2003 " family expenses exchange scavenger fan and speed regulator with similar applications ", GB16410 " household gas utensils ", GB29529-2103 " range hood energy efficiency market and efficiency grade ".
The air performance technical indicator of these household electronic products of technical manual and standard clear stipulaties mainly comprise the maximum static pressure of product, maximum quantity of wind, total pressure efficiency and blast, air quantity and these refer to object detection method.Establishing criteria specifies, the air performance index detection method of the said goods all must be realized by orifice flow method by an air performance testing device.During test, air-flow is successively by the connector of air performance testing device, decompression cylinder is entered after cross rectifier and diffuser, by the opening diameter of conversion decompression cylinder downstream orifice plate, and the decompression cylinder static pressure recorded under each operating point and the dynamic test data formed, and combining environmental temperature, ambient atmosphere pressure situation converses the static pressure under standard state, be the wind pressure value under operating point, then the air quantity under each operating point is drawn by formulae discovery, by the blast under each industrial and mineral point, airflow value least square method forms air performance chart in two-dimensional coordinate system, and calculate final each air performance technical indicator: maximum static pressure, maximum quantity of wind, total pressure efficiency etc.Therefore, be the key that detects of whole household appliances air performance technical indicator and basis to the measurement of decompression cylinder static pressure.At present, nearly all manufacturing enterprise and Inspection Unit all adopt such standard method to carry out the detection of air performance technical indicator.
If adopt other measuring method, to be such as full of in pipe discharge method etc. with orifice plate, nozzle and Venturi measuring, then standard of obviously having run counter to is unified detection method method, is allowed measurement result can have the intention of rational degree of confidence, real inadvisable.
Under prior art conditions, differential pressure transmitter mainly utilizes the compression of inner elastomeric assembly and ejects the perception realized differential pressure.Technology comparatively advanced at present utilizes in shell to be provided with a piston be made up of cylinder and head flange, by the head flange of piston, large chamber is divided into high and low pressure region, elastic parts is arranged on piston, form the situation simultaneously effectively using two differential pressure measurement module work, strengthen and measure range (See patent " a kind of flow transmitter and pressure difference measurement method that double differential pressure sensors is housed ", Authorization Notice No. CN101819052B).But the linear preservers of the measured value of differential pressure transmitter depends on the telescopic linear situation of inner elastomeric assembly.Elasticity coefficient due to elastic parts be subject to material, structure, etc. the impact of many factors, therefore the realistic situation that the measured value linearity of differential pressure transmitter is poor is caused, and cause single use differential pressure transmitter to carry out the larger situation of electric equipment products air performance measurement deviation, also increase the instability of measurement result simultaneously.Viewed from the measurement data comparison situation between current each testing laboratory and enterprise, also reflect the situation that measured value deviation is large, deviation can reach more than 10%.Therefore, traditional existing measuring method also exists systematic defect, urgently improves.Certainly the space that can improve further all existed from the pressure of equipment investment cost, static pressure.Below just by as follows to the defect of existing measurement scheme, defect cause and improvement behave particularize:
1, the cylinder static pressure measurement that reduces pressure is inaccurate.The air performance test methods specified utilizing standard carries out in measuring process, the perforate in conversion decompression cylinder downstream, the static pressure of the cylinder that reduces pressure under measuring different perforate.In this process, along with the increase of perforate, the static pressure of decompression cylinder diminishes immediately.The air performance of next electric equipment products of generalized case is measured, and the static pressure recorded of decompression cylinder can from hundreds of Pa to the change of a few Pa, and the measure linear degree of differential pressure transmitter determines the accuracy in whole measuring process.The measurement of differential pressure transmitter is realized by the differential pressure pick-up of inside.Inner differential pressure pick-up be by resilient material flexible come the change of sensed pressure, therefore the elasticity coefficient of resilient material can keep good consistance to be the key factor ensureing the differential pressure transmitter linearity in the telescopic extensions of resilient material.And in fact resilient material is subject to the impact of material, structure, make in its whole telescopic extensions, particularly at zero crossings and full scale areas adjacent, there is certain change in elasticity coefficient.But resilient material is at the interlude of telescopic extensions, elasticity coefficient can keep good consistance.So just, make differential pressure transmitter bad with the measure linear degree of full scale areas adjacent near zero-bit.Immediately have employed the difference in flow pressure transmitter with double differential pressure sensors and also cannot solve this system problem, because the resilient material of itself subjects the impact of material, structure too, elasticity coefficient also cannot be consistent.The differential pressure pick-up generally used at present has the reasonable linearity at the 15%-80% of full scale, and more than less than 15% and 80% then the linearity is poor.Although the measure linear degree of import differential pressure transmitter is obviously better than domestic differential pressure transmitter, its price is almost really 10 times more than of domestic differential pressure transmitter, greatly increases the input cost of equipment, real inadvisable.If the linearity problems at differential pressure transmitter two ends therefore can be solved, then greatly can improve the accuracy of measurement.
2, equipment investment cost is excessive.With air device for measuring properties when measuring scavenger fan product, along with the change that decompression cylinder tract opening diameter is ascending, the air quantity in each perforate situation and wind pressure value are also along with change.Usually, the airflow value of scavenger fan product is at 0-4m
3between/min, the maximum quantity of wind of oil-fume exhauster product is at 0-30m
3between/min, the air quantity of integrated kitchen range product is at 0-35m
3between/min.When measuring scavenger fan product, decompression cylinder static pressure is generally from about 200Pa to the change of a few Pa; When measuring oil-fume exhauster product, decompression cylinder static pressure is generally from Pa more than 400 to the change of tens Pa; When to integrated kitchen range product, the change of decompression cylinder static pressure generally from about 600Pa to about 20Pa.Therefore, under prior art conditions, due to various electric equipment products reduce pressure in measuring process cylinder static pressure change scope greatly, be difficult on same table apparatus, realize the detection demand to different product.Inspection body or the detection having the manufacturing enterprise of demand can only buy multiple stage air device for measuring properties to be respectively used to scavenger fan, range hood and integrated kitchen range.If the detection realizing completing on same table apparatus different product can be purchased, then the hardware cost greatly reducing inspection machine is dropped into, also greatly can reduce the waste of resource, improve the service efficiency of checkout equipment simultaneously.
What 3, pressure point was arranged is unreasonable, causes departing from of test result.Existing air performance testing device is on decompression cylinder, and the distance of distance downstream perforate 0.375 demultiplication pressure cylinder diameter, is provided with static pressure tapping.Decompression cylinder upstream extremity is separated with the sheet metal of horizontal and vertical respectively, is arranged to latticed with the air-flow in even test timer.Obviously, the shape along the grid besieged city that decompression cylinder inwall one encloses is not identical, passes through the gas flow of difformity grid like this, flow velocity, pressure are not identical.Therefore, be to be enough to reflection decompression tube inner surface average static pressure situation by means of only single static pressure tapping, cause test result and true value to depart from.
For the defect that existing air performance testing device exists, the present invention proposes innovative approach one by one.First, adopt the original differential pressure transmitter of differential pressure transmitter combination replacement of three different ranges, the single differential pressure transmitter measured value linearity of systematicness solution is bad and cause the inaccurate root problem of measurement result.Different electric equipment products measurement variation scope is large, therefore chooses three differential pressure transmitters that range is 1000Pa, 200Pa and 50Pa respectively.Regularly three differential pressure transmitter measurement points are calibrated, the two-dimensional data table typing host computer that calibration point and measured value are formed, each measured value is carried out interpolation arithmetic between adjacent measured values, obtain the interpolation of respective alignment point as final outputting measurement value, and by certain value rule better solutions never with the value relations problems between differential pressure transmitter.So just, solve the problem that the single differential pressure transmitter measured value linearity is not good and test result that is that bring is forbidden; Meanwhile, utilize calibration point to revise measured value, make test result more really accurate.
Secondly, solving on differential pressure transmitter measure linear degree and the not good basis of accuracy, the upstream of the diffuser at air performance testing device is arranged a replaceable flange, realize measuring air device for measuring properties with same and different electric equipment products are measured.Because the diameter at the discharge pipe road junction of scavenger fan, range hood, integrated kitchen range product is all different, scavenger fan is generally 120mm, and range hood is generally 160mm, and integrated kitchen range is 180mm, therefore needs to adopt the connector of different-diameter and cross rectifier to test.In the upstream of diffuser, interchangeable flange is set, according to different test products, choosing different connectors and cross rectifier utilizes replaceable flange to access measurement mechanism, choose suitable systematic parameter at upper machine simultaneously, just can carry out actual measurement, realize the requirement of different Electrical Testing equipment being measured with a proving installation.
3rd, static pressure tapping is increased to 8 by existing decompression cylinder, lay respectively at decompression just go up of cylinder, just under, positive left, a positive right side and static pressure tapping is respectively set with the place at horizontal direction each angle at 45 °, and with an even endless tube of circle, 8 pressure ports to be communicated with.The impact that the setting substantially reducing decompression cylinder equalizing lattice lattice like this brings, the pressure condition of correct response decompression cylinder inwall.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of wide range air performance detecting system and method thereof of object appliance product is provided.
Wide range air performance detecting system based on object appliance product comprises air device for measuring properties, and the first differential pressure transmitter, the second differential pressure transmitter, the 3rd differential pressure transmitter, the first protection solenoid valve, the second protection solenoid valve, the first control relay circuit, the second control relay circuit, atmospheric pressure transmitter, temperature sensor, 6 passage A/D change digital display meter, host computer, treat electricity measurer and connecting line;
The air intake opening of the first differential pressure transmitter high pressure feed, the first protection solenoid valve air intake opening, the second protection solenoid valve is in parallel, be connected with the pressure pipe of air device for measuring properties, first differential pressure transmitter low pressure input port communicates with air, and the first protection solenoid valve gas outlet, the second protection solenoid valve gas outlet are connected with the high pressure feed of the second differential pressure transmitter high pressure feed, the 3rd differential pressure transmitter respectively; Treat that the gas outlet of electricity measurer is connected with the connector of air device for measuring properties;
6 passage A/D change digital display meters Analog input mModule respectively with the first differential pressure transmitter, second differential pressure transmitter, 3rd differential pressure transmitter, atmospheric pressure transmitter, temperature sensor is connected, 6 passage A/D change 485 transmission interfaces of digital display meter and are connected with the one 485 transmission interface of host computer 800, realize the one-way data transfer being changed digital display meter and host computer by 6 passage A/D, 2 485 transmission interface of host computer, 3 485 transmission interface respectively with the signal receiving circuit of the first control relay circuit, the signal receiving circuit of the second control relay circuit is connected, realizing circuit control signal by host computer to the first control relay circuit, the one-way transmission of the second control relay circuit, first protection solenoid valve, second protection solenoid valve accesses the relay contact circuit of the first control relay circuit and the relay contact circuit of the second relay phase control circuit respectively,
The first described differential pressure transmitter, the second differential pressure transmitter, the 3rd differential pressure transmitter are two-way differential pressure transmitter; First differential pressure transmitter is used for wide range differential pressure transmitter, and for measuring the static pressure that air device for measuring properties high regime gas produces, range is 0-1000Pa; Second differential pressure transmitter is used for middle range differential pressure transmitter, and for measuring the static pressure that air device for measuring properties middling speed section gas produces, range is 0-200Pa; 3rd differential pressure transmitter is used for small-range differential pressure transmitter, and for measuring the static pressure that air device for measuring properties low speed segment gas produces, range is 0-50Pa.
Described air device for measuring properties comprises the conversion orifice plate be connected in turn, the cylinder that reduces pressure, fixing diffuser, replaceable joint flange, cross rectifier, connector, replaceable diffuser, and decompression cylinder is provided with pressure pipe;
The orifice plate that described conversion orifice plate has 21 pieces of opening diameters different, opening diameter is 0-200mm, take 10mm as step-length.
Decompression cylinder in described air device for measuring properties has 8 static pressure tappings, be respectively: the first static pressure tapping, the second static pressure tapping, the 3rd static pressure tapping, the 4th static pressure tapping, the 5th static pressure tapping, the 6th static pressure tapping, the 7th static pressure tapping, the 8th static pressure tapping, 8 static pressure tappings lay respectively at just go up of decompression cylinder, just under, positive left, the positive right side and the place with each angle at 45 ° of horizontal direction, and accessing grading ring pipes with 8 metal tubes, grading ring pipe is connected with one end of the pressure pipe in air device for measuring properties.
The method of the wide range air performance detecting system of described object appliance product comprises measurement mechanism and prepares flow process, measures preparation flow process, testing process, software computation and measurement flow process;
Measurement mechanism prepares flow process: the first differential pressure transmitter, the second differential pressure transmitter, the 3rd differential pressure transmitter are calibrated respectively,
By the calibration two-dimensional data table typing upper computer software system that the calibration point after the first differential pressure transmitter, the second differential pressure transmitter, the 3rd differential pressure transmitter calibration and measured value are formed,
To the first differential pressure transmitter in upper computer software system, second differential pressure transmitter, the calibration 2-D data of the 3rd differential pressure transmitter sets: the 160Pa calibration point of the first differential pressure transmitter is the first differential pressure transmitter calibration correction value line access point M1, the calibration point 150Pa of the second differential pressure transmitter, calibration point 40Pa is respectively the calibration correction value line height access point N1 of the second differential pressure transmitter and low access point M2, the calibration point 30Pa of the 3rd differential pressure transmitter (230) is the calibration correction value line access point N2 of the 3rd differential pressure transmitter, M1, N1, M2, the measured value of N2 is respectively PM1, PN1, PM2, PN2,
According to the first differential pressure transmitter, second differential pressure transmitter, the calibration two-dimensional data table of the 3rd differential pressure transmitter, one bar of continuous print calibration correction value line is determined: the 800Pa calibration point of 0-N2-M2-N1-M1-the 3rd differential pressure transmitter in the two-dimensional coordinate system of correspondence, at two-dimensional coordinate system middle conductor 0-N2, M2-N1, the 800Pa calibration point of M1-the 3rd differential pressure transmitter is respectively the first differential pressure transmitter, second differential pressure transmitter, 3rd differential pressure transmitter is at 0-N2, M2-N1, each calibration two-dimemsional number strong point within the scope of the 800Pa calibration point of M1-the 3rd differential pressure transmitter in two-dimensional coordinate system connecting line, N2-M2, N1-M1 is respectively a year N2 and M2, the connecting line of N1 and M1 in two-dimensional coordinate system,
Measure and prepare flow process: according to treating that the gas outlet diameter of electricity measurer selects suitable connector, cross rectifier and replaceable diffuser by the fixing diffuser of replaceable joint flange access air device for measuring properties,
The Survey Software of host computer is selected appropriate system parameter,
Closedown first is manually set and protects solenoid valve and the second protection solenoid valve,
Treat electricity measurer in connector access, and will treat that electricity measurer is started shooting, and fully moves to steady state (SS);
Testing process: by numeral 0 to 20 by 21 pieces of conversion orifice plate numberings, numeral is corresponding with the opening diameter of conversion orifice plate: the orifice plate of the orifice plate of numeral 0 corresponding opening diameter 0mm, the orifice plate of numeral 1 corresponding opening diameter 10mm, numeral 2 corresponding opening diameter 20mm, by that analogy, obtain the orifice plate that digital 3-20 is corresponding
Measure and start, step one: test at the conversion orifice plate of decompression cylinder tract dress peek No. i-th, word, on-test i=0,
Step 2: if upper computer software judges first differential pressure transmitter measured value PA >=200Pa; then upper computer software computation and measurement value, and enter step 3, if PA<200Pa; opening the first protection solenoid valve makes the second differential pressure transmitter enter measuring state
If upper computer software judges the second differential pressure transmitter measured value PB < 50Pa; then upper computer software computation and measurement value; and enter step 3; if PB < is 50Pa; opening the second protection solenoid valve makes the 3rd differential pressure transmitter enter measuring state; and upper computer software computation and measurement value, and enter step 3
Step 3: i=i+1, upper computer software judges i ≠ 21, then close the first protection solenoid valve and the second protection solenoid valve, and return step one, if i=21, off-test, host computer exports measurement result;
Software computation and measurement value flow process: host computer obtains measurement data by the one 485 transmission interface and carries out computation and measurement value, the measured value of the first differential pressure transmitter, the second differential pressure transmitter, the 3rd differential pressure transmitter is respectively PA, PB, PC, the point A of corresponding two-dimensional coordinate system, some B, some C
The measured value that PA > first differential pressure transmitter calibration point 800Pa is corresponding, or the measured value that PA < first differential pressure transmitter calibration point 150Pa is corresponding, the measured value that PB > second differential pressure transmitter calibration point 160Pa is corresponding simultaneously, or the measured value that PB < second differential pressure transmitter calibration point 30Pa is corresponding, the measured value that PC > the 3rd differential pressure transmitter calibration point 40Pa is corresponding simultaneously, system occurs that outrange is reported to the police, stop test
PA >=PM1, gets measured value PA, and passes through the calibration correction value P ' A of calibration two-dimensional data table with interpolation calculation PA of the first differential pressure transmitter, exports P ' A for decompression cylinder static pressure,
PA < PM1, or PB > PN1, respectively by calibration correction value P ' A, P ' B of the calibration two-dimensional data table interpolation calculation PA of the first differential pressure transmitter and the second differential pressure transmitter, PB, utilize two-dimensional coordinate method of intersection on calibration correction value line, calculate the calibration correction value P ' F1 of intersection point F1, export P ' F1 for decompression cylinder static pressure
PB≤PN1, and PB >=PM2, get measured value PB, and pass through the calibration correction value P ' B of calibration two-dimensional data table with interpolation calculation PB of the second differential pressure transmitter, exports P ' B for decompression cylinder static pressure
PB < PM2, or PC > PN2, respectively by calibration correction value P ' B, P ' C of the calibration two-dimensional data table interpolation calculation PB of the second differential pressure transmitter and the 3rd differential pressure transmitter, PC, utilize two-dimensional coordinate method of intersection on calibration correction value line, calculate the calibration correction value P ' F2 of intersection point F2, export P ' F2 for decompression cylinder static pressure
PC≤PN2, gets measured value PC, and passes through the calibration correction value P ' C of calibration two-dimensional data table with interpolation calculation PC of the 3rd differential pressure transmitter, exports P ' C for decompression cylinder static pressure,
Convert 21 pieces of conversion orifice plates, record 21 all each decompression cylinder static pressures, calculate each air performance index of tested model machine, and draw air performance characteristic, Output rusults.
The present invention is compared with background technology, and the beneficial effect had is:
By the differential pressure transmitter of three different ranges, the measure linear taking full advantage of each differential pressure transmitter is interval, the solving because differential pressure transmitter is not high in the measurement range measured value linearity of system, the problem that skew is severe, improve the accuracy of measurement of household electrical appliance air device for measuring properties, expand measurement range;
By the differential pressure transmitter of three different ranges, realize the increase of measurement range, replaceable flange is increased at the diffuser of air device for measuring properties, diffuser is divided into two into replaceable diffuser and fixing diffuser, make tester can select the connector of different air device for measuring properties and the combination of cross rectifier according to the air outlet diameter of different product, realize at an air device for measuring properties to the detection of different household electronic products, the hardware greatly reducing measuring equipment drops into;
The static pressure tapping of cylinder of reducing pressure in air device for detecting performance is increased to 8, and is communicated with by 8 static pressure tappings with a grading ring pipe, the impact that the setting substantially reducing decompression cylinder equalizing lattice lattice brings, the pressure condition of correct response decompression cylinder inwall.
Accompanying drawing explanation
Fig. 1 (a) is the wide range air performance detecting system structural drawing of object appliance product;
Fig. 1 (b) is the air device for measuring properties structural drawing of household appliances air performance detecting system;
Fig. 1 (c) is the air device for measuring properties decompression barrel structure figure of household appliances air performance detecting system;
Fig. 2 (a) is that the device of household appliances air method for testing performance prepares process flow diagram;
Fig. 2 (b) is that the measurement of household appliances air method for testing performance prepares process flow diagram;
Fig. 2 (c) is the measurement procedure figure of household appliances air method for testing performance;
Fig. 2 (d) is the software computation and measurement value process flow diagram of household appliances air method for testing performance;
Fig. 3 is the Measurement and calibration modified value line chart of household appliances air method for testing performance.
Embodiment
As shown in Figure 1, wide range air performance detecting system based on object appliance product comprises air device for measuring properties 100, first differential pressure transmitter 210, second differential pressure transmitter 220, the 3rd differential pressure transmitter 230, first protects solenoid valve 310, second to protect solenoid valve 320, first control relay circuit 410, second control relay circuit 420, atmospheric pressure transmitter 500, temperature sensor 600,6 passage A/D to change digital display meter 700, host computer 800, treat electricity measurer 800 and connecting line;
The air intake opening of the first differential pressure transmitter 210 high pressure feed, the first protection solenoid valve 310 air intake opening, the second protection solenoid valve 320 is in parallel, be connected with the pressure pipe 110 of air device for measuring properties 100, first differential pressure transmitter 210 low pressure input port communicates with air, and the first protection solenoid valve 310 gas outlet, the second protection solenoid valve 320 gas outlet are connected with the high pressure feed of the second differential pressure transmitter 220 high pressure feed, the 3rd differential pressure transmitter 230 respectively; Treat that the gas outlet 910 of electricity measurer 900 is connected with the connector 150 of air device for measuring properties 100;
6 passage A/D change digital display meters 700 Analog input mModule 710 respectively with the first differential pressure transmitter 210, second differential pressure transmitter 220, 3rd differential pressure transmitter 230, atmospheric pressure transmitter 500, temperature sensor 600 is connected, 485 transmission interfaces 720 that 6 passage A/D change digital display meter 700 are connected with the one 485 transmission interface 810 of host computer 800, realize the one-way data transfer being changed digital display meter 700 and host computer 800 by 6 passage A/D, 2 485 transmission interface 820 of host computer 800, 3 485 transmission interface respectively with the signal receiving circuit 411 of the first control relay circuit 410, the signal receiving circuit 421 of the second control relay circuit 420 is connected, realizing circuit control signal by host computer to the first control relay circuit 410, the one-way transmission of the second control relay circuit 420, first protection solenoid valve 310, second protection solenoid valve 320 accesses the relay contact circuit 412 of the first control relay circuit 410 and the relay contact circuit 422 of the second relay phase control circuit 420 respectively,
First differential pressure transmitter 210, second differential pressure transmitter 220 of the present invention, the 3rd differential pressure transmitter 230 are two-way differential pressure transmitter; First differential pressure transmitter 210 is for wide range differential pressure transmitter, and for measuring the static pressure that air device for measuring properties 100 high regime gas produces, range is 0-1000Pa; Second differential pressure transmitter 220 is for middle range differential pressure transmitter, and for measuring the static pressure that air device for measuring properties 100 middling speed section gas produces, range is 0-200Pa; 3rd differential pressure transmitter 230 is for small-range differential pressure transmitter, and for measuring the static pressure that air device for measuring properties 100 low speed segment gas produces, range is 0-50Pa.
Air device for measuring properties 100 of the present invention comprises the conversion orifice plate 180 be connected in turn, the cylinder 170 that reduces pressure, fixing diffuser 120, replaceable joint flange 130, cross rectifier 140, connector 150, replaceable diffuser 160, and decompression cylinder 170 is provided with pressure pipe 110;
The orifice plate that conversion orifice plate 180 of the present invention has 21 pieces of opening diameters different, opening diameter is 0-200mm, take 10mm as step-length.
Decompression cylinder 170 in air device for measuring properties 100 of the present invention has 8 static pressure tappings, be respectively: the first static pressure tapping 171, second static pressure tapping 172, 3rd static pressure tapping 173, 4th static pressure tapping 174, 5th static pressure tapping 175, 6th static pressure tapping 176, 7th static pressure tapping 177, 8th static pressure tapping 178, 8 static pressure tappings lay respectively at just going up of decompression cylinder, just, a positive left side, the positive right side and the place with each angle at 45 ° of horizontal direction, and access grading ring pipes 179 with 8 metal tubes, grading ring pipe 179 is connected with one end of the pressure pipe 110 in air device for measuring properties 100.
As shown in Figure 2, the method for the wide range air performance detecting system of object appliance product comprises measurement mechanism preparation flow process, measures preparation flow process, testing process, software computation and measurement flow process;
Measurement mechanism prepares flow process: the first differential pressure transmitter 210, second differential pressure transmitter 220, the 3rd differential pressure transmitter 230 are calibrated respectively,
Calibration two-dimensional data table typing host computer 800 software systems that calibration point after first differential pressure transmitter 210, second differential pressure transmitter 220, the 3rd differential pressure transmitter 230 being calibrated and measured value are formed,
For avoiding by the first differential pressure transmitter 210, second differential pressure transmitter 220, there is overlapping region in the lubber-line that the calibration 2-D data of the 3rd differential pressure transmitter 230 is formed, and cause the situation that calibration correction value value overlaps, to the first differential pressure transmitter 210 in host computer 800 software systems, second differential pressure transmitter 220, the calibration 2-D data of the 3rd differential pressure transmitter 230 sets: the 160Pa calibration point of the first differential pressure transmitter 210 is the first differential pressure transmitter 210 calibration correction value line access point M1, the calibration point 150Pa of the second differential pressure transmitter 220, calibration point 40Pa is respectively the calibration correction value line height access point N1 of the second differential pressure transmitter 220 and low access point M2, the calibration point 30Pa of the 3rd differential pressure transmitter 230 is the calibration correction value line access point N2 of the 3rd differential pressure transmitter 230, M1, N1, M2, the measured value of N2 is respectively PM1, PN1, PM2, PN2,
According to the first differential pressure transmitter 210, second differential pressure transmitter 220, the calibration two-dimensional data table of the 3rd differential pressure transmitter 230, one bar of continuous print calibration correction value line is determined: the 800Pa calibration point of 0-N2-M2-N1-M1-the 3rd differential pressure transmitter in the two-dimensional coordinate system of correspondence, at two-dimensional coordinate system middle conductor 0-N2, M2-N1, the 800Pa calibration point of M1-the 3rd differential pressure transmitter is respectively the first differential pressure transmitter 210, second differential pressure transmitter 220, 3rd differential pressure transmitter 230 is at 0-N2, M2-N1, each calibration two-dimemsional number strong point within the scope of the 800Pa calibration point of M1-the 3rd differential pressure transmitter in two-dimensional coordinate system connecting line, N2-M2, N1-M1 is respectively a year N2 and M2, the connecting line of N1 and M1 in two-dimensional coordinate system,
Measure and prepare flow process: according to treating that gas outlet 910 diameter of electricity measurer 900 selects suitable connector 150, cross rectifier 140 and replaceable diffuser 160 to access the fixing diffuser 120 of air device for measuring properties 100 by replaceable joint flange 130,
The Survey Software of host computer 800 is selected appropriate system parameter,
Closedown first is manually set and protects solenoid valve 310 and the second protection solenoid valve 320,
Treat electricity measurer 900 in connector 150 access, and will treat that electricity measurer 900 is started shooting, fully move to steady state (SS);
Testing process: 21 pieces of conversion orifice plates 180 are numbered by numeral 0 to 20, numeral is corresponding with the opening diameter of conversion orifice plate 180: the orifice plate of the orifice plate of numeral 0 corresponding opening diameter 0mm, the orifice plate of numeral 1 corresponding opening diameter 10mm, numeral 2 corresponding opening diameter 20mm, by that analogy, obtain the orifice plate that digital 3-20 is corresponding
Measure and start, step one: test at the conversion orifice plate of decompression cylinder tract dress peek No. i-th, word, on-test i=0,
Step 2: if host computer 800 software judges first differential pressure transmitter 210 measured value PA >=200Pa; then upper computer software computation and measurement value, and enter step 3, if PA<200Pa; opening the first protection solenoid valve 310 makes the second differential pressure transmitter 220 enter measuring state
If host computer 800 software judges the second differential pressure transmitter 220 measured value PB < 50Pa; then upper computer software computation and measurement value; and enter step 3; if PB < is 50Pa; opening the second protection solenoid valve 320 makes the 3rd differential pressure transmitter 230 enter measuring state; and upper computer software computation and measurement value, and enter step 3
Step 3: i=i+1, host computer 800 software judges i ≠ 21, then close the first protection solenoid valve 310 and the second protection solenoid valve 320, and return step one, if i=21, off-test, host computer 800 exports measurement result;
Software computation and measurement value flow process: host computer 800 obtains measurement data by the one 485 transmission interface 810 and carries out computation and measurement value, the measured value of the first differential pressure transmitter 210, second differential pressure transmitter 220, the 3rd differential pressure transmitter 230 is respectively PA, PB, PC, the point A of corresponding two-dimensional coordinate system, some B, some C
The measured value that PA > first differential pressure transmitter 210 calibration point 800Pa is corresponding, or the measured value that PA < first differential pressure transmitter 210 calibration point 150Pa is corresponding, the measured value that PB > second differential pressure transmitter 220 calibration point 160Pa is corresponding simultaneously, or the measured value that PB < second differential pressure transmitter 220 calibration point 30Pa is corresponding, the measured value that PC > the 3rd differential pressure transmitter 230 calibration point 40Pa is corresponding simultaneously, system occurs that outrange is reported to the police, stop test,
PA >=PM1, gets measured value PA, and passes through the calibration correction value P ' A of calibration two-dimensional data table with interpolation calculation PA of the first differential pressure transmitter 210, exports P ' A for decompression cylinder 170 static pressure,
PA < PM1, or PB > PN1, respectively by calibration correction value P ' A, P ' B of the calibration two-dimensional data table interpolation calculation PA of the first differential pressure transmitter 210 and the second differential pressure transmitter 220, PB, utilize two-dimensional coordinate method of intersection on calibration correction value line, calculate the calibration correction value P ' F1 of intersection point F1, export P ' F1 for decompression cylinder 170 static pressure
PB≤PN1, and PB >=PM2, get measured value PB, and pass through the calibration correction value P ' B of calibration two-dimensional data table with interpolation calculation PB of the second differential pressure transmitter 220, exports P ' B for decompression cylinder 170 static pressure
PB < PM2, or PC > PN2, respectively by calibration correction value P ' B, P ' C of the calibration two-dimensional data table interpolation calculation PB of the second differential pressure transmitter 220 and the 3rd differential pressure transmitter 230, PC, utilize two-dimensional coordinate method of intersection on calibration correction value line, calculate the calibration correction value P ' F2 of intersection point F2, export P ' F2 for decompression cylinder 170 static pressure
PC≤PN2, gets measured value PC, and passes through the calibration correction value P ' C of calibration two-dimensional data table with interpolation calculation PC of the 3rd differential pressure transmitter 230, exports P ' C for decompression cylinder 170 static pressure,
Convert 21 pieces of conversion orifice plates 180, record 21 all each decompression cylinder static pressures, calculate each air performance index of tested model machine, and draw air performance characteristic, Output rusults.
Illustrate that software calculates obtaining value method:
Table one, table two, table three are respectively the calibration two-dimensional data table of the first differential pressure transmitter 210, second differential pressure transmitter 220, the 3rd differential pressure transmitter 230,
Table one
| Sequence number | Calibration point P ' (Pa) | Measured value P (Pa) | Sequence number | Calibration point P ' (Pa) | Measured value P (Pa) |
| 1 | 0 | 21 | 200 | ||
| 2 | 10 | 22 | 210 | ||
| ... | ... | ... | ... | ... | ... |
| 16 | 150 | 149.8 | 81 | 800 | |
| 17 | 160(M1) | 160.2 | 82 | 810 | |
| 18 | 170 | 170.3 | ... | ... | ... |
| 19 | 180 | 100 | 990 | ||
| 20 | 180 | 101 | 1000 |
Table two
| Sequence number | Calibration point P ' (Pa) | Measured value P (Pa) | Sequence number | Calibration point P ' (Pa) | Measured value P (Pa) |
| 1 | 0 | 15 | 140 | ||
| 2 | 10 | 16 | 150(N1) | 150.1 | |
| 3 | 20 | 17 | 160 | 160.3 | |
| 4 | 30 | 29.8 | 18 | 170 | |
| 5 | 40(M2) | 40.1 | 19 | 180 | |
| 6 | 50 | 50.1 | 20 | 190 | |
| 7 | 60 | 21 | 200 | ||
| ... | ... | ... |
Table three
| Sequence number | Calibration point P ' (Pa) | Measured value P (Pa) | Sequence number | Calibration point P ' (Pa) | Measured value P (Pa) |
| 1 | 0 | 7 | 30(N2) | 30.1 | |
| 2 | 5 | 8 | 35 | 35.3 | |
| 3 | 10 | 9 | 40 | 40.4 | |
| 4 | 15 | 10 | 45 | ||
| 5 | 20 | 11 | 50 | ||
| 6 | 25 |
As shown in Figure 3, formed the Measurement and calibration modified value line chart of household appliances air method for testing performance by the calibration 2-D data of table one, table two, table three,
First differential pressure transmitter 210 measured value PA=165.2Pa,
By interpolation calculation, export decompression cylinder static pressure:
First differential pressure transmitter 210 measured value PA=154.8Pa, the second differential pressure transmitter 220 measured value PB=155.3Pa,
First, by calibration P ' A, the P ' B of mathematic interpolation measured value PA, PB:
Then, two-dimensional coordinate method of intersection is utilized to calculate an A and some the B straight line formed and the calibration correction value P ' F1 putting M1, the straight intersection point F1 of some N1 shape:
Export decompression cylinder static pressure 155Pa,
First differential pressure transmitter 210 measured value PA=148.8Pa, the second differential pressure transmitter 220 measured value PB=161.2Pa,
System occurs that outrange is reported to the police, and stops test,
In like manner, the decompression cylinder static pressure through calibration correction in the various measured value situations of the first differential pressure transmitter 210, second differential pressure transmitter 220, the 3rd differential pressure transmitter 230 can be obtained.
Claims (4)
1. the wide range air performance detecting system of an object appliance product, it is characterized in that system comprises air device for measuring properties (100), first differential pressure transmitter (210), second differential pressure transmitter (220), 3rd differential pressure transmitter (230), first protection solenoid valve (310), second protection solenoid valve (320), first control relay circuit (410), second control relay circuit (420), atmospheric pressure transmitter (500), temperature sensor (600), 6 passage A/D change digital display meter (700), host computer (800), treat electricity measurer (800) and connecting line,
The air intake opening of the first differential pressure transmitter (210) high pressure feed, the first protection solenoid valve (310) air intake opening, the second protection solenoid valve (320) is in parallel, be connected with the pressure pipe (110) of air device for measuring properties (100), first differential pressure transmitter (210) low pressure input port communicates with air, and the first protection solenoid valve (310) gas outlet, the second protection solenoid valve (320) gas outlet are connected with the high pressure feed of the second differential pressure transmitter (220) high pressure feed, the 3rd differential pressure transmitter (230) respectively; Treat that the gas outlet (910) of electricity measurer (900) is connected with the connector (150) of air device for measuring properties (100);
6 passage A/D change digital display meter (700) Analog input mModule (710) respectively with the first differential pressure transmitter (210), second differential pressure transmitter (220), 3rd differential pressure transmitter (230), atmospheric pressure transmitter (500), temperature sensor (600) is connected, 485 transmission interfaces (720) that 6 passage A/D change digital display meter (700) are connected with the one 485 transmission interface (810) of host computer 800, realize the one-way data transfer being changed digital display meter (700) and host computer (800) by 6 passage A/D, 2 485 transmission interface (820) of host computer (800), 3 485 transmission interface respectively with the signal receiving circuit (411) of the first control relay circuit (410), the signal receiving circuit (421) of the second control relay circuit (420) is connected, realizing circuit control signal by host computer to the first control relay circuit (410), the one-way transmission of the second control relay circuit (420), first protection solenoid valve (310), second protection solenoid valve (320) accesses relay contact circuit (412) and the relay contact circuit (422) of the second relay phase control circuit (420) of the first control relay circuit (410) respectively,
Described the first differential pressure transmitter (210), the second differential pressure transmitter (220), the 3rd differential pressure transmitter (230) are two-way differential pressure transmitter; First differential pressure transmitter (210) is for wide range differential pressure transmitter, and for measuring the static pressure that air device for measuring properties (100) high regime gas produces, range is 0-1000Pa; Second differential pressure transmitter (220) is for middle range differential pressure transmitter, and for measuring the static pressure that air device for measuring properties (100) middling speed section gas produces, range is 0-200Pa; 3rd differential pressure transmitter (230) is for small-range differential pressure transmitter, and for measuring the static pressure that air device for measuring properties (100) low speed segment gas produces, range is 0-50Pa.
2. the wide range air performance detecting system of object appliance product according to claim 1, it is characterized in that described air device for measuring properties (100) comprises the conversion orifice plate (180) be connected in turn, the cylinder (170) that reduces pressure, fixing diffuser (120), replaceable joint flange (130), cross rectifier (140), connector (150), replaceable diffuser (160), decompression cylinder (170) is provided with pressure pipe (110);
The orifice plate that described conversion orifice plate (180) has 21 pieces of opening diameters different, opening diameter is 0-200mm, take 10mm as step-length.
3. the wide range air performance detecting system of object appliance product according to claim 1, it is characterized in that the decompression cylinder (170) in described air device for measuring properties (100) has 8 static pressure tappings, be respectively: the first static pressure tapping (171), second static pressure tapping (172), 3rd static pressure tapping (173), 4th static pressure tapping (174), 5th static pressure tapping (175), 6th static pressure tapping (176), 7th static pressure tapping (177), 8th static pressure tapping (178), 8 static pressure tappings lay respectively at just going up of decompression cylinder, just, a positive left side, the positive right side and the place with each angle at 45 ° of horizontal direction, and access grading ring pipe (179) with 8 metal tubes, grading ring pipe (179) is connected with one end of the pressure pipe (110) in air device for measuring properties (100).
4. use a method for the wide range air performance detecting system of object appliance product as claimed in claim 1, it is characterized in that comprising measurement mechanism prepares flow process, measures preparation flow process, testing process, software computation and measurement flow process;
Measurement mechanism prepares flow process: the first differential pressure transmitter (210), the second differential pressure transmitter (220), the 3rd differential pressure transmitter (230) are calibrated respectively,
By calibration two-dimensional data table typing host computer (800) software systems that the calibration point after the first differential pressure transmitter (210), the second differential pressure transmitter (220), the 3rd differential pressure transmitter (230) calibration and measured value are formed,
To the first differential pressure transmitter (210) in host computer (800) software systems, second differential pressure transmitter (220), the calibration 2-D data of the 3rd differential pressure transmitter (230) sets: the 160Pa calibration point of the first differential pressure transmitter (210) is the first differential pressure transmitter (210) calibration correction value line access point M1, the calibration point 150Pa of the second differential pressure transmitter (220), calibration point 40Pa is respectively the calibration correction value line height access point N1 of the second differential pressure transmitter (220) and low access point M2, the calibration point 30Pa of the 3rd differential pressure transmitter (230) is the calibration correction value line access point N2 of the 3rd differential pressure transmitter (230), M1, N1, M2, the measured value of N2 is respectively PM1, PN1, PM2, PN2,
According to the first differential pressure transmitter (210), second differential pressure transmitter (220), the calibration two-dimensional data table of the 3rd differential pressure transmitter (230), one bar of continuous print calibration correction value line is determined: the 800Pa calibration point of 0-N2-M2-N1-M1-the 3rd differential pressure transmitter in the two-dimensional coordinate system of correspondence, at two-dimensional coordinate system middle conductor 0-N2, M2-N1, the 800Pa calibration point of M1-the 3rd differential pressure transmitter is respectively the first differential pressure transmitter (210), second differential pressure transmitter (220), 3rd differential pressure transmitter (230) is at 0-N2, M2-N1, each calibration two-dimemsional number strong point within the scope of the 800Pa calibration point of M1-the 3rd differential pressure transmitter in two-dimensional coordinate system connecting line, N2-M2, N1-M1 is respectively N2 and M2, the connecting line of N1 and M1 in two-dimensional coordinate system,
Measure and prepare flow process: according to treating that gas outlet (910) diameter of electricity measurer (900) selects suitable connector (150), cross rectifier (140) and replaceable diffuser (160) by the fixing diffuser (120) of replaceable joint flange (130) access air device for measuring properties (100)
The Survey Software of host computer (800) is selected appropriate system parameter,
Closedown first is manually set and protects solenoid valve (310) and the second protection solenoid valve (320),
Treat electricity measurer (900) in connector (150) access, and will treat that electricity measurer (900) is started shooting, fully move to steady state (SS);
Testing process: by numeral 0 to 20 by 21 pieces of conversion orifice plate (180) numberings, numeral is corresponding with the opening diameter of conversion orifice plate (180): the orifice plate of the orifice plate of numeral 0 corresponding opening diameter 0mm, the orifice plate of numeral 1 corresponding opening diameter 10mm, numeral 2 corresponding opening diameter 20mm, by that analogy, obtain the orifice plate that digital 3-20 is corresponding
Measure and start, step one: test at the conversion orifice plate of decompression cylinder tract dress peek No. i-th, word, on-test i=0,
Step 2: if host computer (800) software judges the first differential pressure transmitter (210) measured value PA >=200Pa; then upper computer software computation and measurement value; and enter step 3; if PA<200Pa; opening the first protection solenoid valve (310) makes the second differential pressure transmitter (220) enter measuring state
If host computer (800) software judges the second differential pressure transmitter (220) measured value PB < 50Pa; then upper computer software computation and measurement value; and enter step 3; if PB < is 50Pa; opening the second protection solenoid valve (320) makes the 3rd differential pressure transmitter (230) enter measuring state; and upper computer software computation and measurement value, and enter step 3
Step 3: i=i+1, host computer (800) software judges i ≠ 21, then close the first protection solenoid valve (310) and the second protection solenoid valve (320), and return step one, if i=21, off-test, host computer (800) exports measurement result;
Software computation and measurement value flow process: host computer (800) obtains measurement data by the one 485 transmission interface (810) and carries out computation and measurement value, the measured value of the first differential pressure transmitter (210), the second differential pressure transmitter (220), the 3rd differential pressure transmitter (230) is respectively PA, PB, PC, the point A of corresponding two-dimensional coordinate system, some B, some C
The measured value that PA > first differential pressure transmitter (210) calibration point 800Pa is corresponding, or the measured value that PA < first differential pressure transmitter (210) calibration point 150Pa is corresponding, the measured value that PB > second differential pressure transmitter (220) calibration point 160Pa is corresponding simultaneously, or the measured value that PB < second differential pressure transmitter (220) calibration point 30Pa is corresponding, the measured value that PC > the 3rd differential pressure transmitter (230) calibration point 40Pa is corresponding simultaneously, system occurs that outrange is reported to the police, stop test
PA >=PM1, gets measured value PA, and passes through the calibration correction value P ' A of calibration two-dimensional data table with interpolation calculation PA of the first differential pressure transmitter (210), exports P ' A for decompression cylinder (170) static pressure,
PA < PM1, or PB > PN1, respectively by calibration correction value P ' A, P ' B of the calibration two-dimensional data table interpolation calculation PA of the first differential pressure transmitter (210) and the second differential pressure transmitter (220), PB, utilize two-dimensional coordinate method of intersection on calibration correction value line, calculate the calibration correction value P ' F1 of intersection point F1, export P ' F1 for decompression cylinder (170) static pressure
PB≤PN1, and PB >=PM2, get measured value PB, and pass through the calibration correction value P ' B of calibration two-dimensional data table with interpolation calculation PB of the second differential pressure transmitter (220), exports P ' B for decompression cylinder (170) static pressure
PB < PM2, or PC > PN2, respectively by calibration correction value P ' B, P ' C of the calibration two-dimensional data table interpolation calculation PB of the second differential pressure transmitter (220) and the 3rd differential pressure transmitter (230), PC, utilize two-dimensional coordinate method of intersection on calibration correction value line, calculate the calibration correction value P ' F2 of intersection point F2, export P ' F2 for decompression cylinder (170) static pressure
PC≤PN2, gets measured value PC, and passes through the calibration correction value P ' C of calibration two-dimensional data table with interpolation calculation PC of the 3rd differential pressure transmitter (230), exports P ' C for decompression cylinder (170) static pressure,
Convert 21 pieces of conversion orifice plate (180), record 21 all each decompression cylinder static pressures, calculate each air performance index of tested model machine, and draw air performance characteristic, Output rusults.
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