CN202048936U - Micro differential pressure measuring instrument - Google Patents
Micro differential pressure measuring instrument Download PDFInfo
- Publication number
- CN202048936U CN202048936U CN2010206535549U CN201020653554U CN202048936U CN 202048936 U CN202048936 U CN 202048936U CN 2010206535549 U CN2010206535549 U CN 2010206535549U CN 201020653554 U CN201020653554 U CN 201020653554U CN 202048936 U CN202048936 U CN 202048936U
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- pressure
- transmitter
- differential pressure
- measuring instrument
- circuit
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Abstract
The utility model relates to a measuring instrument, especially a micro differential pressure measuring instrument, which comprises a transmitter housing; a pressure sensor and a micro differential pressure transmitter are disposed in the transmitter housing; a static pressure guiding pipe and a total pressure guiding pipe are disposed on the pressure sensor; wherein the pressure sensor and the micro differential pressure transmitter are formed into a one-piece structure; the micro differential pressure transmitter is a circuit board disposed in the transmitter housing; the circuit board includes a pressure sensor chip and an electronic amplification circuit. The utility model increases the stability of the whole circuit and the transmission signal; the instrument has the advantages of strong anti-interference capability, high measuring precision and low construction cost.
Description
Technical field
The utility model relates to a kind of surveying instrument, and especially a kind of elementary errors is pressed measuring instrument.
Background technology
Wind flow of power plant coal is the important parameter that influences safe operation of the boiler, and measured deviation can directly influence the self-regulating normal input of primary air flow.When a wind pressure is on the low side, can cause the coal pulverizer powder delivery not smooth, will increase operating cost greatly and wind pressure is higher.At present, traditional traditional plate manometer is adopted in the measurement of a wind flow usually, and this pressure gauge exists lag error, retarded elasticity error, gap error, frictional error, temperature error etc., so its error is bigger.In the actual motion, operating personnel can't in time adjust boiler combustion according to measuring air quantity, especially in unit varying load process, for preventing a wind crosswind of coal pulverizer quantity not sufficient, operating personnel can only keep high air quantity operation, thereby influence boiler combustion and performance driving economy, also bring the wear problem of a coal pulverizer and an airduct simultaneously.
Elementary errors pressure measuring instrument is a more advanced wind flow measurement mechanism at present, but sensor and transmitter normally separate in the existing measuring system, to interconnect by long signal transmission wire between sensor and the transmitter, the disturbed easily or decay of signal causes the charge signal in the signal transmission wire very faint.For addressing the above problem, need to adopt the electron-amplifier of high-amplification-factor that electric signal is amplified, though this method has improved the enlargement factor of instrument, disturbed by operating mode, make the instrument job insecurity, influenced measuring accuracy.In addition, the measuring unit of sensor and the transducing unit of transmitter are independent separately, need between them to connect with shielded cable, and be very strict to the requirement of stake resistance, and stake resistance needs trouble to be installed, the construction cost height less than 4 Ω.
The utility model content
The purpose of this utility model is to have proposed a kind of minute-pressure difference measurements instrument, and the stability that it has improved integrated circuit and transmission signals has stronger antijamming capability, the measuring accuracy height, and construction cost is low.
The utility model is to adopt following technical scheme to realize: a kind of elementary errors is pressed measuring instrument, comprise the transmitter shell, be provided with pressure transducer and differential pressure transmitter in the transmitter shell, pressure transducer is provided with static pressure pressure guiding pipe and total head pressure guiding pipe, wherein, described pressure transducer and differential pressure transmitter are integral structure, and promptly differential pressure transmitter is the circuit board that is arranged in the transmitter shell, and this circuit board comprises pressure sensor chip and electronic amplification circuit.
In the utility model, described electronic amplification circuit is made up of electric charge sample circuit, voltage amplifier circuit and voltage-current converter circuit.
Described pressure transducer can adopt piezoresistive pressure sensor.
The beneficial effects of the utility model are: by pressure transducer and differential pressure transmitter are made integral structure, differential pressure transmitter is placed in the terminal box that is provided with pressure transducer, shortened the length of signal transmission wire between differential pressure transmitter and the pressure transducer greatly, increased antijamming capability when improving integrated circuit stability, the signal measurement precision improves; Secondly, it is highly sensitive, the frequency response height, and measurement range is wide, precision height, reliable operation; Simultaneously, signal transmission wire is not had specific (special) requirements, easy construction has reduced construction cost.
Description of drawings
Fig. 1 is a cut-open view of the present utility model;
Fig. 2 is a fundamental diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is described further.
Fig. 1 is that elementary errors described in the utility model is pressed measuring instrument.This measuring instrument comprises transmitter shell 1, is provided with pressure transducer and differential pressure transmitter 2 in the transmitter shell 1, and pressure transducer can adopt piezoresistive pressure sensor.Pressure transducer is provided with two pressure guiding pipes, is respectively static pressure pressure guiding pipe 3 and total head pressure guiding pipe 4, and static pressure pressure guiding pipe 3 is arranged in the low-pressure cavity, is used to import static pressure; Total head pressure guiding pipe 4 is arranged in the high pressure chest, is used to import total head.The total head that static pressure pressure guiding pipe 3 and total head pressure guiding pipe 4 record respectively and the pressure differential of static pressure are in the dynamic pressure value input differential pressure transmitter 2.
Pressure transducer and differential pressure transmitter 2 are integral structure, be that differential pressure transmitter 2 is for being arranged on the circuit board in the transmitter shell 1, comprise pressure sensor chip and the electronic amplification circuit of soldering on circuit board, wherein electronic amplification circuit is made up of electric charge sample circuit, voltage amplifier circuit and voltage-current converter circuit three parts.The effect of differential pressure transmitter 2 is that the weak voltage signal that pressure transducer is exported is amplified, changes, and outputting standard current signal 4-20mA.Its principle of work is as shown in Figure 2: the differential pressure signal Δ a that the pressure guiding pipe 3 and the total head pressure guiding pipe 4 of pressure transducer recorded, record the voltage signal Δ q of differential pressure signal correspondence through survey sensor AE, being sent to sampling amplifying circuit DH sampling amplifies, output voltage uV signal amplifies through voltage amplification DY circuit, output voltage Δ U signal is given electric current and voltage U/I change-over circuit, and the dc current signal 4-20mA of outputting standard is sent to user facility, show differential pressure value, thereby calculate wind speed.
During this measuring instrument work, entire equipment directly is placed on measure field, static pressure pressure guiding pipe 3 and total head pressure guiding pipe 4 are separately positioned in low-pressure cavity and the high pressure chest, and measurement static pressure and total head value, in total head value that records and the pressure difference signal of the static pressure input differential pressure transmitter 2,2 pairs of pressure difference signals of differential pressure transmitter carry out processing and amplifying, and the electric signal that will produce after will handling is exported by cable, electrical signal conversion is digital signal or simulating signal as required, thereby records the wind speed of a wind.
Claims (3)
1. an elementary errors is pressed measuring instrument, comprise transmitter shell (1), be provided with pressure transducer and differential pressure transmitter (2) in the transmitter shell (1), pressure transducer is provided with static pressure pressure guiding pipe (3) and total head pressure guiding pipe (4), it is characterized in that: described pressure transducer and differential pressure transmitter (2) are integral structure, be that differential pressure transmitter (2) is the circuit board that is arranged in the transmitter shell (1), this circuit board comprises pressure sensor chip and electronic amplification circuit.
2. elementary errors according to claim 1 is pressed measuring instrument, and it is characterized in that: described electronic amplification circuit is made up of electric charge sample circuit, voltage amplifier circuit and voltage-current converter circuit.
3. elementary errors according to claim 1 and 2 is pressed measuring instrument, it is characterized in that: described pressure transducer adopts piezoresistive pressure sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206535549U CN202048936U (en) | 2010-12-10 | 2010-12-10 | Micro differential pressure measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206535549U CN202048936U (en) | 2010-12-10 | 2010-12-10 | Micro differential pressure measuring instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202048936U true CN202048936U (en) | 2011-11-23 |
Family
ID=44989242
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206535549U Expired - Fee Related CN202048936U (en) | 2010-12-10 | 2010-12-10 | Micro differential pressure measuring instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202048936U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103604557A (en) * | 2013-11-01 | 2014-02-26 | 江门市盈瑞科技有限公司 | High-precision fluid differential pressure sensor |
| CN109974830A (en) * | 2019-04-17 | 2019-07-05 | 江苏欣达通信科技股份有限公司 | The detection device calculated based on weighing |
-
2010
- 2010-12-10 CN CN2010206535549U patent/CN202048936U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103604557A (en) * | 2013-11-01 | 2014-02-26 | 江门市盈瑞科技有限公司 | High-precision fluid differential pressure sensor |
| CN109974830A (en) * | 2019-04-17 | 2019-07-05 | 江苏欣达通信科技股份有限公司 | The detection device calculated based on weighing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111123 Termination date: 20151210 |
|
| EXPY | Termination of patent right or utility model |