CN2289208Y - Differential pressure type computerized flowmeter - Google Patents
Differential pressure type computerized flowmeter Download PDFInfo
- Publication number
- CN2289208Y CN2289208Y CN 96233963 CN96233963U CN2289208Y CN 2289208 Y CN2289208 Y CN 2289208Y CN 96233963 CN96233963 CN 96233963 CN 96233963 U CN96233963 U CN 96233963U CN 2289208 Y CN2289208 Y CN 2289208Y
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- China
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- control chip
- main control
- connects
- differential pressure
- flowmeter
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- Expired - Fee Related
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Abstract
The utility model relates to a differential pressure type computerized flowmeter, which belongs to the fluid measuring technology. The utility model is composed of a machine casing, a host board, a miniature printer, a display key board, a power supply, an externally connected sensing transmitter and a throttling device. A main control chip 8098 is respectively connected with two non-volatile RAMs and-EPROMs by an address latch, is respectively connected with 8279 and 8155 by a decoder, and then is respectively connected with the printer and the display board via an interface circuit. Then, the data acquisition is completed, and calculation is extracted, displayed and output. The utility model is an automatic instrument with high reliability, high precision, and strong interference immunity.
Description
The utility model belongs to the fields of measurement of fluid, is specifically related to a kind of differential pressure type computer flowmeter.
The flowmeter of measuring fluid flow at present mostly is semi-automatic formula, promptly only adopts control automatically in a few links such as data processing, and automaticity is not high.Chinese patent 88206445 discloses a kind of " electronic gas flowmeter ", and it is made up of sensing probe, power conversion circuit and demonstration and Acquisition Circuit, is the resolution element formula, and automaticity is lower, precision and reliability are relatively poor.Chinese patent 92108885 discloses a kind of " electronic flow-meter ", employing be large scale integrated circuit and digital device and analogue means, its integrated degree is also not high, anti-interference is not good enough yet.
But the utility model provides a kind of high reliability and high precision, the strong interference immunity multi-channel sampling and differential pressure type computer flowmeter that automatic printing and Presentation Function are arranged.
The utility model is to adopt 8098 to make the master control chip, the pressure difference signal that fluid is produced in pipeline by differential pressure transmitter changes the receivable current signal of computing machine into, by 8098 single-chip microcomputer timing samplings, and calculate with the fluid media (medium) parameter that the user pre-deposits in the non-volatile ram, obtain a result, thereby improved accuracy of instrument greatly.
The utility model is made up of casing, motherboard, mini-printer, display button plate, power supply, external sensing transducer and restriction device.External sensing transducer is established differential pressure transmitter 1-4, pressure unit 1-4 is individual, temperature transmitter 1-4 is individual, can measure 1-4 channel capacity.Sensing transducer is connected the motherboard electronic switch by socket with shielding line, electronic switch connects filtering circuit and main control chip 8098 successively.Main control chip 8908 connects two non-volatile RAM integrated packages and EPROM integrated package respectively by address latch, realizes depositing in and reading of data.Main control chip 8098 connects 8155 on the one hand by code translator, connects printer through interface circuit again, connects 8279 on the other hand and connects the display button plate through interface circuit again, realizes the demonstration and the printing of information.Main control chip 8098 also directly with two non-volatile RAMs and three collectors of EPROM, and 8155 be connected with 8279 circuit are two-way, realizes the input and the extraction of data.
The course of work is: the fluid pipeline of flowing through, before and after the restriction device orifice plate, produce a pressure differential, differential pressure transmitter changes this pressure difference signal into computing machine discernible current signal, select to measure passage by electronic switch, signal arrives in the sampling holder of single-chip microcomputer 8098 through filtering circuit, carries out analog to digital conversion.Sampled data with pre-deposit in the non-volatile RAM parameter as calculated, produce flow value, select 8279 by code translator, realize that data output shows; Select 8155, realize the data printing.Single-chip microcomputer 8098 has 4 road modulus sampling channels, expands to 12 the road or 16 the tunnel by electronic switch, is connected with sensor, realizes multi-channel sampling.
The utility model has adopted single-chip microcomputer 8098 to make the master control chip, and simulation, digitizer focuses on, and integrated degree height, sampling hold circuit be in 8098 inside, has high reliability, advantage that interference resistance is strong.The sampled data resolution is ten, and precision reaches 1/1023, thereby has improved accuracy of instrument greatly.Adopt the non-volatile RAM stored data to have the power-failure protecting function, make instrument more reliable.The utility model can be measured the flow of 1-4 passage, and for the user has reduced expense to greatest extent, and each functional module interconnects by web member, and is easy to maintenance.
Fig. 1 is the utility model block diagram.
Embodiment: select DDZ-III electronic type differential pressure transmitter 1-4, pressure unit 1-4, temperature transmitter 1-4 for use, the restriction device that links with it is by GB 2624-81 design and installation.Each transmitter output signal connects the motherboard electronic switch by socket, shielding line.Electronic switch connects the filtering circuit of being made up of capacitance resistance, connects main control chip 8098 again.8098 link address latch 74L9373 connect two integrated circuit non-volatile RAM DS1220 and an EPROM 27256/128 respectively by address latch.8098 connect code translators 416 is connected printer and display button plate by 8155 respectively again with 8279 and interface circuit.On the other hand, main control chip 8098 is connected with 8279 circuit are two-way with EPROM 27256/128 and 8155 with two non-volatile RAM DS1220 again, realizes the input and output of data.D.C. regulated power supply connects motherboard, for this flowmeter provides power supply.Present embodiment also picks out the RS232 serial interface circuit by main control chip 8098, through telecommunication connection management microcomputer, can realize computer management.The 0832D/A change-over circuit is also picked out by main control chip 8098, connects solenoid valve, can control the fluid flow size by solenoid valve.
Main control chip of the present utility model, address latch, code translator non-volatile RAM, EPROM, 8155, integrated packages such as 8279 all are loaded on the motherboard and place in the casing.
Claims (2)
1. differential pressure type computer flowmeter, form by casing, motherboard, mini-printer, display button plate, power supply, external sensing transducer and restriction device, it is characterized in that sensing transducer passes through socket, shielding line connects the motherboard electronic switch, electronic switch connects filtering circuit and main control chip 8098 successively, and main control chip 8098 connects three integrated circuit non-volatile RAMs, non-volatile RAM and EPROM respectively by address latch; Main control chip 8098 connects 8155 on the one hand by code translator, connects printer through interface circuit again; Connect 8279 on the other hand and connect the display button plate through interface circuit again; Main control chip 8098 also directly is connected with 8279 circuit are two-way with three integrated circuit of two non-volatile RAMs and EPROM and 8155, realizes the input and the extraction of data.
2. differential pressure type computer flowmeter according to claim 1 is characterized in that described external sensing transducer is 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96233963 CN2289208Y (en) | 1996-10-25 | 1996-10-25 | Differential pressure type computerized flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96233963 CN2289208Y (en) | 1996-10-25 | 1996-10-25 | Differential pressure type computerized flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2289208Y true CN2289208Y (en) | 1998-08-26 |
Family
ID=33910497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96233963 Expired - Fee Related CN2289208Y (en) | 1996-10-25 | 1996-10-25 | Differential pressure type computerized flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2289208Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100337095C (en) * | 2004-12-17 | 2007-09-12 | 张国仁 | Flux integrating instrument of iterating differential pressure |
| CN104697597A (en) * | 2015-03-13 | 2015-06-10 | 陈少庆 | Pressure signal flow digital display instrument and application method |
-
1996
- 1996-10-25 CN CN 96233963 patent/CN2289208Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100337095C (en) * | 2004-12-17 | 2007-09-12 | 张国仁 | Flux integrating instrument of iterating differential pressure |
| CN104697597A (en) * | 2015-03-13 | 2015-06-10 | 陈少庆 | Pressure signal flow digital display instrument and application method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |