CN104132696A - Portable pore plate measuring instrument - Google Patents
Portable pore plate measuring instrument Download PDFInfo
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- CN104132696A CN104132696A CN201410377135.XA CN201410377135A CN104132696A CN 104132696 A CN104132696 A CN 104132696A CN 201410377135 A CN201410377135 A CN 201410377135A CN 104132696 A CN104132696 A CN 104132696A
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Abstract
A portable pore plate measuring instrument is characterized by comprising a differential pressure collecting circuit, a temperature collecting circuit, an absolute pressure collecting circuit, a clock circuit, a single-chip microcomputer, a liquid crystal circuit and a keyboard circuit according to the circuit principle, the differential pressure collecting circuit, the temperature collecting circuit, the absolute pressure collecting circuit, the clock circuit and the single-chip microcomputer are connected through IIC buses, the keyboard circuit is connected with the input end of the single-chip microcomputer, and the signal output end of the single-chip microcomputer is connected with the signal input end of the liquid crystal circuit. The front-back differential pressure of a pore plate is measured through the direct measurement method, and therefore the portable pore plate measuring instrument is small in error, has a temperature and pressure compensation function, can measure the pore plate through pore plate devices with different pore plate coefficients, is high in applicability, small in size, convenient to carry and simple in measuring process, and can be carried to different measurement points by measurement personnel for measurement.
Description
Technical field
The present invention relates to measuring apparatus, particularly relate to a kind of device of measuring gas flow in gas drainage pipe.
Background technology
In control of coalmine gas, essential to the monitoring of every data in gas drainage pipe, pipe temperature, pipeline pressure, pipeline flow etc. data are the basic basis in governance process.Flow is a kind of very important measurement parameter on colliery, and for many years, colliery has adopted a variety of methods for the measurement of gas flow, but all very undesirable, and conventional have three kinds of schemes:
Scheme one: widely used orifice flowmeter on colliery, colliery is still continued to use traditional U-shaped pipe and is measured its differential pressure in the time of concrete use, again in conjunction with manifold pressure and temperature, calculate and could obtain outflow by orifice plate formula, therefore use is very loaded down with trivial details and inconvenient, has affected on colliery and has carried out accurately real-time monitoring for pipeline flow.
Scheme two: be used in conjunction with the required pressure differential of measuring flow with two pipe pressure sensors, cost is high, indirect mode is measured, amplify the systematic error of original pipeline pressure measuring value, cause result inaccurate, read after force value, still need to calculate and just can obtain flow value through orifice plate formula, use still loaded down with trivial details.
Scheme three: existing complete orifice flowmeter, few in number, and expensive, every orifice flowmeter is only applicable to a kind of caliber, is not suitable for production capacity little, and the colliery that measuring point is many is used.
Therefore, urgent need one is simple in structure, easy to operate, measuring accuracy is high, the novel orifice plate measurement mechanism that cost is low.
Summary of the invention
The object of this invention is to provide a kind of portable orifice-plate measuring instrument for solving the problems of the technologies described above.
Portable orifice-plate measuring instrument of the present invention, the circuit theory of described portable orifice-plate measuring instrument comprises pressure reduction Acquisition Circuit, temperature collection circuit, absolute pressure Acquisition Circuit, clock circuit, single-chip microcomputer, liquid crystal circuit, keyboard circuit, wherein between pressure reduction Acquisition Circuit, temperature collection circuit, absolute pressure Acquisition Circuit, clock circuit and single-chip microcomputer, adopt iic bus to be connected, keyboard circuit connects the input end of single-chip microcomputer, the signal input part of the signal output part connecting fluid crystal circuit of single-chip microcomputer;
Pressure reduction Acquisition Circuit is for gathering the pressure difference value of gas drainage pipeline inner hole plate both sides; Temperature collection circuit is used for gathering environment temperature; Absolute pressure Acquisition Circuit is for gathering the force value of orifice plate windward side; Clock circuit is used for the real time record time, and time value is presented on the liquid crystal display in liquid crystal circuit by single-chip microcomputer; Liquid crystal circuit is for the flow value in the gas drainage pipe that shows the pressure of each operating circuit collection and temperature value and calculate through single-chip microcomputer.
In described clock circuit, between the first pin of clock chip and the second pin, be connected the second crystal oscillator, the 4th pin ground connection of clock chip, the 7th pin of clock chip connects 3V power supply through resistance R 11, the 8th pin of clock chip connects the negative pole of diode, the positive pole of diode connects the positive pole of button cell, the minus earth of button cell, the negative pole of diode connects 3.6V power supply, the 6th pin of clock chip connects the 19 pin of single-chip microcomputer, the 5th pin of clock chip connects the 20 pin of single-chip microcomputer, and the first pin of clock chip is through capacitor C 9 ground connection.
In described temperature collection circuit, the 4th pin ground connection of temperature sensor, the the 5th to the 8th pin of temperature sensor connects 3V power supply, and simultaneously through capacitor C 12 ground connection, the first pin of temperature sensor, the second pin connect respectively the 20 pin, the 19 pin of single-chip microcomputer.
Described pressure reduction Acquisition Circuit, the first pin ground connection of differential pressure pickup, the second pin connect 3V power supply, and between two pins, connect capacitor C 11, the 3rd pin of differential pressure pickup, the 20 pin, the 19 pin that the 4th pin connects respectively single-chip microcomputer.
In described absolute pressure Acquisition Circuit, the first pin ground connection of pressure transducer, the second pin connect 3V power supply, and between two pins, connect capacitor C 10, the 3rd pin of pressure transducer, the 20 pin, the 19 pin that the 4th pin connects respectively single-chip microcomputer.
The structure composition of described portable orifice-plate measuring instrument comprises, fore shell, back cover, circuit board, high-pressure mouth, low pressure port, wherein the rear portion of front casing is uniformly distributed button row, forms nine grids button, the front portion of fore shell is provided with liquid crystal display window, is evenly provided with four screw holes on the periphery of back cover;
It is fixing as a whole that described fore shell and back cover use screw to be combined by screw hole, high-pressure mouth, low pressure port are set up in parallel on the front end face of fore shell, high-pressure mouth, low pressure port are positioned at two ports of measuring instrument inside, be connected with two inlet ends of differential pressure pickup through snorkel respectively, high-pressure mouth is three way type interface, and another branch road is connected with absolute pressure sensor.
Described fore shell, back cover are the narrow rectangular parallelepiped in wide centre, two ends.
This product adopts pressure reduction before and after direct metering system measuring diaphragm, and error is little, carries temperature, pressure compensation, and orifice plate equipment that can the different orifice constants of setup and use is measured, and applicability is strong.Volume is little, is easy to carry, and measuring process is simple, can be carried into different measuring points by survey crew and measure.
Below in conjunction with accompanying drawing, portable orifice-plate measuring instrument of the present invention is described further.
Brief description of the drawings
Fig. 1 is portable orifice-plate measuring instrument theory diagram of the present invention;
Fig. 2 is portable orifice-plate measuring instrument electrical block diagram;
Fig. 3 is portable orifice-plate measuring instrument front plan view and board side view;
Fig. 4 is portable orifice-plate measuring instrument reverse side vertical view;
Fig. 5 is and the matching used orifice plate mounting structure of portable orifice-plate measuring instrument schematic diagram.
Embodiment
As shown in Figure 1, portable orifice-plate measuring instrument of the present invention comprises pressure reduction Acquisition Circuit, temperature collection circuit, absolute pressure Acquisition Circuit, clock circuit, single-chip microcomputer, liquid crystal circuit, keyboard circuit, wherein between pressure reduction Acquisition Circuit, temperature collection circuit, absolute pressure Acquisition Circuit, clock circuit and single-chip microcomputer, adopt iic bus to be connected, keyboard circuit connects the input end of single-chip microcomputer, the signal input part of the signal output part connecting fluid crystal circuit of single-chip microcomputer;
Pressure reduction Acquisition Circuit is for gathering the pressure difference value of gas drainage pipeline inner hole plate both sides; Temperature collection circuit is used for gathering environment temperature; Absolute pressure Acquisition Circuit is for gathering the force value of orifice plate windward side; Clock circuit is used for the real time record time, and time value is presented on the liquid crystal display in liquid crystal circuit by single-chip microcomputer; Liquid crystal circuit is for the flow value in the gas drainage pipe that shows the pressure of each operating circuit collection and temperature value and calculate through single-chip microcomputer.
As shown in Figure 2, portable orifice-plate measuring instrument circuit structure of the present invention comprises that charging circuit U1, single-chip microcomputer U2, clock chip U3, temperature sensor U4, source of stable pressure U5, differential pressure pickup DP1, pressure transducer AP1, LCD interface J1, capacitor C 1 are to capacitor C 15, resistance R 1 to resistance R 12, LCD backlight LED interface JP1, the first crystal oscillator Y1, the second crystal oscillator Y2, triode BG1, USB interface USB1, diode D3, button S2 to button S9;
The first pin 1 of charging circuit U1, the 3rd pin 3 ground connection, the second pin 2 resistance in series R1 of charging circuit U1, the rear ground connection of resistance R 2, the 4th pin 4 of charging circuit U1 connects the rear ground connection of capacitor C 2, after the 8th pin 8 connecting resistance R3 of charging circuit U1, connect 3.6V power supply, the 5th pin 5 of charging circuit U1 connects 3.6V power supply, connects the rear ground connection of capacitor C 1 simultaneously;
Ground five pins 5 of single-chip microcomputer U2, the 27 pin 27, the 17 pin 17, the 38 pin 38 meets power supply VCC, the 6th pin 6 of single-chip microcomputer U2, the 18 pin 18, the 28 pin 28, the 39 pin 39 ground connection, the 21 pin 21 of single-chip microcomputer U2 connects the collector of triode BG1, the 22 pin 22 of single-chip microcomputer U2, the 23 pin 23 provides 3V power supply, the 25 pin 25 of single-chip microcomputer, between the 26 pin 26, be connected with the first crystal oscillator Y1, the 37 pin 37 of single-chip microcomputer U2 connects the second pin 2 of LCD backlight LED interface JP1, after the first pin 1 connecting resistance R12 of LCD backlight LED interface JP1, connect 3V power supply, the 33 pin 33 of single-chip microcomputer U2 connects the rear ground connection of capacitor C 13, one end of resistance R 5 connects 3.6V power supply, ground connection after other end contact resistance R6, resistance R 5, between resistance R 6, connect the 33 pin 33 of single-chip microcomputer U2,
Between the first pin 1 of clock chip U3 and the second pin 2, be connected the second crystal oscillator Y2, the 4th pin 4 ground connection of clock chip U3, the 7th pin 7 of clock chip U3 connects 3V power supply through resistance R 11, the 8th pin 8 of clock chip U3 connects the negative pole of diode D3, the positive pole of diode D3 connects the positive pole of button cell BT2, the minus earth of button cell BT2, the negative pole of diode D3 connects 3.6V power supply, the 6th pin 6 of clock chip U3 connects the 19 pin 19 of single-chip microcomputer U2, the 5th pin 5 of clock chip U3 connects the 20 pin 20 of single-chip microcomputer U2, the first pin 1 of clock chip U3 is through capacitor C 9 ground connection,
The 4th pin 4 ground connection of temperature sensor U4, the the 5th to the 8th pin of temperature sensor U4 connects 3V power supply, simultaneously through capacitor C 12 ground connection, the 20 pin the 20, the 19 pin 19 that the first pin 1 of temperature sensor U4, the second pin 2 meet respectively single-chip microcomputer U2;
The first pin 1 of source of stable pressure U5 is through connecing capacitor C 14 ground connection, and the first pin of source of stable pressure U5 provides power supply VCC, and the 3rd pin 3 of source of stable pressure U5 is through capacitor C 15 ground connection, and the 3rd pin 3 of source of stable pressure U5 connects 3.6V power supply, the second pin 2 ground connection of source of stable pressure U5;
The first pin 1 ground connection of differential pressure pickup DP1, the second pin 2 connect 3V power supply, and between two pins, connect capacitor C 11, the 3rd pin 3 of differential pressure pickup DP1, the 20 pin the 20, the 19 pin 19 that the 4th pin 4 connects respectively single-chip microcomputer U2;
The first pin 1 ground connection of pressure transducer AP1, the second pin 2 connect 3V power supply, and between two pins, connect capacitor C 10, the 3rd pin 3 of pressure transducer AP1, the 20 pin the 20, the 19 pin 19 that the 4th pin 4 connects respectively single-chip microcomputer U2;
The first pin 1 of LCD interface J1, the second pin 2, the 17 pin 17, the 18 pin 18, the 19 pin 19, the 20 pin 20, the 26 pin 26 connects 3V power supply, the 3rd pin 3 of LCD interface J1, the 21 pin 21, the 22 pin 22, the 23 pin 23, the 24 pin 24 ground connection, the 4th pin 4 of LCD interface J1 connects the 36 pin 36 of single-chip microcomputer U2, the 5th pin 5 of LCD interface J1 connects the 35 pin 35 of single-chip microcomputer U2, the 6th pin 6 of LCD interface J1 connects the 34 pin 34 of single-chip microcomputer U2, the 7th pin 7 of LCD interface J1 connects the 32 pin 32 of single-chip microcomputer U2, the 8th pin 8 of LCD interface J1 connects the 31 pin 31 of single-chip microcomputer U2, the 9th pin 9 of LCD interface J1 connects the 40 pin 40 of single-chip microcomputer U2, the tenth pin 10 of LCD interface J1 connects the 41 pin 41 of single-chip microcomputer U2, the 11 pin 11 of LCD interface J1 connects the 42 pin 42 of single-chip microcomputer U2, the 12 pin 12 of LCD interface J1 connects the 43 pin 43 of single-chip microcomputer U2, the 13 pin 13 of LCD interface J1 connects the 44 pin 44 of single-chip microcomputer U2, the 14 pin 14 of LCD interface J1 connects the first pin 1 of single-chip microcomputer U2, the 15 pin 15 of LCD interface J1 connects the second pin 2 of single-chip microcomputer U2, the 16 pin 16 of LCD interface J1 connects the 3rd pin 3 of single-chip microcomputer U2, the 17 pin 17 of LCD interface J1, the 18 pin 18, the 19 pin 19, the 20 pin the 20 and the 21 pin 21, the 22 pin 22, the 23 pin 23, between the 24 pin 24, connect capacitor C 3, the 25 pin 25 of LCD interface J1 is through capacitor C 8 ground connection, the 27 pin 27 of LCD interface J1 is through capacitor C 7 ground connection, the 28 pin 28 of LCD interface J1 is through capacitor C 6 ground connection, the 29 pin 29 of LCD interface J1 is through capacitor C 5 ground connection, the 30 pin 30 of LCD interface J1 is through capacitor C 4 ground connection,
One end of button S2 connects the 9th pin 9 of single-chip microcomputer U2, other end ground connection; One end of button S3 connects the tenth pin 10 of single-chip microcomputer U2, other end ground connection; One end of button S4 connects the 11 pin 11 of single-chip microcomputer U2, other end ground connection; One end of button S5 connects the 12 pin 12 of single-chip microcomputer U2, other end ground connection; One end of button S6 connects the 13 pin 13 of single-chip microcomputer U2, other end ground connection; One end of button S7 connects the 14 pin 14 of single-chip microcomputer U2, other end ground connection; One end of button S8 connects the 15 pin 15 of single-chip microcomputer U2, other end ground connection; One end of button S9 connects the 16 pin 16 of single-chip microcomputer U2, other end ground connection;
The 21st pin of the collector single-chip microcomputer U2 of triode BG1, the transmitter ground connection of triode BG1, a termination power VIN of resistance R 4, another termination capacitor C 16, the other end ground connection of capacitor C 16, the base stage of triode BG1 is received between resistance R 4 and capacitor C 16; The minus earth of electric battery P, the anodal order series connection of electric battery P, through resistance R 10, after R9, externally provides 3.6V power supply; The one termination 3V power supply other end of resistance R 7 connects the 19 pin 19 of single-chip microcomputer U2, and a termination 3V power supply other end of resistance R 8 connects the 20 pin 20 of single-chip microcomputer U2; The first pin of USB interface USB1 provides power supply VIN, the 5th pin ground connection.
What charging circuit U1 adopted is that model is the battery charging integrated circuit of the usb compatible of a 500mA of CN3062, in the time that electric battery P electric weight is not enough, use usb data line to connect USB Power Adapter or computer USB port, charging circuit U1 can complete the charging to electric battery, the peripheral circuit of charging circuit U1 is arranged to cross-flow mode, after being full of electricity, automatically stop charging, effectively protect battery, improve the serviceable life of battery;
Single-chip microcomputer U2 adopts the ATMEGA16L of atmel company, and stability is high;
Clock chip U3 model is PCF8563, and current time is provided, and in conjunction with peripheral circuit, when the master battery pack P electricity shortage, built-in button cell BT2 is that clock chip keeps power supply;
Temperature sensor U4 is a temperature sensor LM75 of NS company, and current temperature value is passed to single-chip microcomputer by bus, and flow value is carried out to temperature compensation, the impact of the change of avoiding Yin Wendu on flow measurement result;
The model of source of stable pressure U5 is 7530A-1, after converting the 3.6V output of electric battery P to 3V, gives single-chip microcomputer again;
Differential pressure pickup DP1 is a digital pressure reduction pressure transducer of Honeywell company, for measuring diaphragm both sides pressure difference, and passes to single-chip microcomputer by iic bus mode, and measurement result is more accurate, more reliable;
Pressure transducer AP1 is a digital absolute pressure pressure transducer of Honeywell company, for the current atmospheric pressure value of measuring diaphragm windward side, and pass to single-chip microcomputer by iic bus, flow value is carried out to pressure compensation, the impact of the change of air pressure of avoiding orifice plate windward side on flow measurement result.Display screen adopts the LCD liquid crystal display that resolution is 128 × 128, and by LCD interface, J1 is connected with single-chip microcomputer.
As Fig. 3, shown in Fig. 4, portable orifice-plate measuring instrument of the present invention comprises fore shell 1, back cover 5, circuit board 7, high-pressure mouth 4, low pressure port 3, wherein fore shell 1, back cover 5 is respectively the narrow rectangular recess in wide centre, two ends, hand-held after being convenient to coordinate, the rear portion of front casing 1 is uniformly distributed button row, form nine grids button 2, the front portion of fore shell 1 is provided with liquid crystal display window 6-1, on the periphery of back cover 5, be evenly provided with four screw holes 10, the front and rear part of back cover 5 is disposed with two nameplates 11, fore shell 1 is combined fixing as a whole with back cover 5 by screw hole 10 use screws, on the front end face of fore shell 1, be set side by side with high-pressure mouth 4, low pressure port 3, high-pressure mouth 4, two ports that low pressure port 3 is positioned at measuring instrument inside are connected with two inlet ends of differential pressure pickup through snorkel respectively, in addition, high-pressure mouth 4 is three way type interface, another branch road is connected with absolute pressure sensor, temperature sensor is positioned at the main circuit board back side, for measures ambient temperature, on the rear end face of fore shell 1, be provided with USB interface,
Circuit board 7 is with on surface corresponding to fore shell 1, corresponding position distribution has corresponding nine buttons with nine grids button, and the position corresponding with liquid crystal display window is provided with LCD liquid crystal display 6; The circuit board 7 surperficial lower end corresponding with back cover 5 is provided with power supply 8.
As shown in Figure 5, comprise first interface 12, the second interface 13, the first valve 14, the second valve 15, orifice plate 16, orifice plate 16 is arranged in pipeline by two flange arrangement parts, and first interface 12, the second interface 13 are drawn in the both sides of orifice plate 16, in figure, the direction of arrow illustrates gas flow, and the left surface of orifice plate 16 is windward side, and the right flank of orifice plate 16 is lee face, first interface 12 is drawn by orifice plate windward side, and the second interface 13 is drawn by orifice plate lee face;
For in pipeline, other needs the place of measuring flow that corresponding orifice plate 16, first interface 12, the second interface 13 only need be installed in the manner described above.
In actual measurement, only the high-pressure mouth of portable orifice-plate measuring instrument 4 need be connected to first interface 12, low pressure port 3 connects the second interface 13, open the first valve 14, the second valve 15, then opening measuring instrument can measure, the pressure difference value that differential pressure pickup records orifice plate 16 both sides flows to single-chip microcomputer by iic bus, the force value that pressure transducer records orifice plate windward side flows to single-chip microcomputer by iic bus, temperature sensor records environment temperature and flows to single-chip microcomputer by iic bus, single-chip microcomputer receives the next signal of each sensor collection and draws on the flow value demonstration and LCD liquid crystal display of orifice plate 16 place pipelines according to default computing method.
Above-described embodiment is described the preferred embodiment of the present invention; not scope of the present invention is limited; design under the prerequisite of spirit not departing from the present invention; various distortion and improvement that those of ordinary skill in the art make technical scheme of the present invention, all should fall in the definite protection domain of the claims in the present invention book.
Claims (7)
1. a portable orifice-plate measuring instrument, it is characterized in that, the circuit theory of described portable orifice-plate measuring instrument comprises pressure reduction Acquisition Circuit, temperature collection circuit, absolute pressure Acquisition Circuit, clock circuit, single-chip microcomputer, liquid crystal circuit, keyboard circuit, wherein between pressure reduction Acquisition Circuit, temperature collection circuit, absolute pressure Acquisition Circuit, clock circuit and single-chip microcomputer, adopt iic bus to be connected, keyboard circuit connects the input end of single-chip microcomputer, the signal input part of the signal output part connecting fluid crystal circuit of single-chip microcomputer;
Pressure reduction Acquisition Circuit is for gathering the pressure difference value of gas drainage pipeline inner hole plate both sides; Temperature collection circuit is used for gathering environment temperature; Absolute pressure Acquisition Circuit is for gathering the force value of orifice plate windward side; Clock circuit is used for the real time record time, and time value is presented on the liquid crystal display in liquid crystal circuit by single-chip microcomputer; Liquid crystal circuit is for the flow value in the gas drainage pipe that shows the pressure of each operating circuit collection and temperature value and calculate through single-chip microcomputer.
2. portable orifice-plate measuring instrument according to claim 1, it is characterized in that, in described clock circuit, between first pin (1) of clock chip (U3) and the second pin (2), be connected the second crystal oscillator (Y2), the 4th pin (4) ground connection of clock chip (U3), the 7th pin (7) of clock chip (U3) connects 3V power supply through resistance R 11, the 8th pin (8) of clock chip (U3) connects the negative pole of diode (D3), the positive pole of diode (D3) connects the positive pole of button cell (BT2), the minus earth of button cell (BT2), the negative pole of diode (D3) connects 3.6V power supply, the 6th pin (6) of clock chip (U3) connects the 19 pin (19) of single-chip microcomputer (U2), the 5th pin (5) of clock chip (U3) connects the 20 pin (20) of single-chip microcomputer (U2), first pin (1) of clock chip (U3) is through capacitor C 9 ground connection.
3. portable orifice-plate measuring instrument according to claim 2, it is characterized in that, in described temperature collection circuit, the 4th pin (4) ground connection of temperature sensor (U4), the the 5th to the 8th pin of temperature sensor (U4) connects 3V power supply, through capacitor C 12 ground connection, first pin (1) of temperature sensor (U4), the second pin (2) connect respectively the 20 pin (20), the 19 pin (19) of single-chip microcomputer (U2) simultaneously.
4. portable orifice-plate measuring instrument according to claim 3, it is characterized in that, described pressure reduction Acquisition Circuit, the first pin (1) ground connection of differential pressure pickup (DP1), the second pin (2) connect 3V power supply, and between two pins, connect capacitor C 11, the 3rd pin (3) of differential pressure pickup (DP1), the 20 pin (20), the 19 pin (19) that the 4th pin (4) connects respectively single-chip microcomputer (U2).
5. portable orifice-plate measuring instrument according to claim 4, it is characterized in that, in described absolute pressure Acquisition Circuit, the first pin (1) ground connection of pressure transducer (AP1), the second pin (2) connect 3V power supply, and between two pins, connect electric capacity (C10), the 3rd pin (3) of pressure transducer (AP1), the 20 pin (20), the 19 pin (19) that the 4th pin (4) connects respectively single-chip microcomputer (U2).
6. portable orifice-plate measuring instrument according to claim 5, it is characterized in that, the structure composition of described portable orifice-plate measuring instrument comprises, fore shell (1), back cover (5), circuit board (7), high-pressure mouth (4), low pressure port (3), wherein the rear portion of front casing (1) is uniformly distributed button row, form nine grids buttons (2), the front portion of fore shell (1) is provided with liquid crystal display window (6-1), is evenly provided with four screw holes (10) on the periphery of back cover (5);
Fore shell (1) is combined fixing as a whole with back cover (5) by screw hole (10) with screw, high-pressure mouth (4), low pressure port (3) are set up in parallel on the front end face of fore shell (1), two ports that high-pressure mouth (4), low pressure port (3) are positioned at measuring instrument inside are connected with two inlet ends of differential pressure pickup through snorkel respectively, high-pressure mouth (4) is three way type interface, and another branch road is connected with absolute pressure sensor.
7. portable orifice-plate measuring instrument according to claim 6, is characterized in that, described fore shell (1), back cover (5) are the narrow rectangular parallelepiped in wide centre, two ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410377135.XA CN104132696A (en) | 2014-08-01 | 2014-08-01 | Portable pore plate measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410377135.XA CN104132696A (en) | 2014-08-01 | 2014-08-01 | Portable pore plate measuring instrument |
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| Publication Number | Publication Date |
|---|---|
| CN104132696A true CN104132696A (en) | 2014-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410377135.XA Pending CN104132696A (en) | 2014-08-01 | 2014-08-01 | Portable pore plate measuring instrument |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109827703A (en) * | 2019-03-27 | 2019-05-31 | 歌尔股份有限公司 | Air pressure detection method, device and washing machine |
| CN110231051A (en) * | 2019-06-21 | 2019-09-13 | 中国飞行试验研究院 | A kind of airborne wireless height velocity sensing device |
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| JPH08136305A (en) * | 1994-11-10 | 1996-05-31 | Toshiba Corp | Transmitter |
| CN2935096Y (en) * | 2006-05-19 | 2007-08-15 | 李易 | Integrated differential pressure flowmeter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109827703A (en) * | 2019-03-27 | 2019-05-31 | 歌尔股份有限公司 | Air pressure detection method, device and washing machine |
| CN110231051A (en) * | 2019-06-21 | 2019-09-13 | 中国飞行试验研究院 | A kind of airborne wireless height velocity sensing device |
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