CN202915960U - Pitot tube flow meter - Google Patents
Pitot tube flow meter Download PDFInfo
- Publication number
- CN202915960U CN202915960U CN 201220546583 CN201220546583U CN202915960U CN 202915960 U CN202915960 U CN 202915960U CN 201220546583 CN201220546583 CN 201220546583 CN 201220546583 U CN201220546583 U CN 201220546583U CN 202915960 U CN202915960 U CN 202915960U
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- way valve
- pitot tube
- pressure chamber
- pressure
- negative
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- Expired - Fee Related
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Abstract
The utility model discloses a Pitot tube flow meter. The Pitot tube flow meter comprises a positioning and negative pressure chamber and an automatic back flushing unit, wherein the automatic back flushing unit comprises a three-way valve, the positioning and negative pressure chamber is connected with two ends of the three-way valve, the third end of the three-way valve is connected with an external compressed air pipeline, a pressure sensor and a temperature sensor are arranged in a pipeline of the positioning and negative pressure chamber and are connected with a control unit, the control unit calculates data of the pressure sensor and the temperature sensor to obtain flow data, is further connected with the three-way valve and control the switching of the three-way valve. By means of the technical scheme, zero point automatic calibration of a transmitter, automatic back flushing and data revaluation are achieved, and the Pitot tube flow meter is convenient to install and maintain on site.
Description
Technical field
The utility model relates to a kind of surveying instrument equipment, especially a kind of pitot tube flowmeter.
Background technology
Existing pitot tube flowmeter needs the discrete element such as independent differential pressure transmitter, pressure unit, thermopair, temperature transmitter, pitot tube, blowback solenoid valve to form in the market.The field apparatus installation wants multiple spot perforate, blowback to change need to be by extraneous control module, and the output measuring-signal does not have pressure, temperature compensation, is not real flow velocity signal.Differential pressure transmitter is affected by the installation site, can produce drift zero point, transmitter is adjusted and must be linked together with pitot tube zero point, positive and negative two pressure guiding pipes need be in same pressure, could demarcate zero point transmitter, pitot tube can't be demarcated zero point under the normal behaviour in service, and the rig-site utilization failure rate is high.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of pitot tube flowmeter, can realize transmitter automatic Calibration at zero point, automatic back blow, data reduction, and installation and maintenance are convenient at the scene.
For solving the problems of the technologies described above, the technical scheme of the utility model pitot tube flowmeter is, comprise the positive/negative-pressure chamber, also comprise the automatic back blow unit, described automatic back blow unit comprises a three-way valve, described positive/negative-pressure chamber is connected by the wherein two ends of described three-way valve, the 3rd end of described three-way valve is connected to the external compression air duct, be provided with pressure transducer and temperature sensor in the pipeline of described positive/negative-pressure chamber, described pressure transducer and temperature sensor are connected with control module, described control module calculates data on flows with the data of pressure transducer and temperature sensor, and described control module also connects and control the switching of described three-way valve simultaneously.
The utility model has been realized transmitter automatic Calibration at zero point by adopting technique scheme, and automatic back blow and data reduction, and on-site installation and maintenance are very convenient.
Description of drawings
Below in conjunction with drawings and Examples the utility model is described in further detail:
Fig. 1 is structural representation of the present utility model.
Reference numeral is among the figure, 1. pressure transducer and temperature sensor; 2. three-way valve; 3. gas tank; 4. solenoid valve; 5. negative pressure chamber; 6. plemum.
Embodiment
The utility model discloses a kind of pitot tube flowmeter, as shown in Figure 1, comprise positive/negative-pressure chamber 5,6, and automatic back blow unit, described automatic back blow unit comprises a three-way valve 2, described positive/negative-pressure chamber is connected by the wherein two ends of described three-way valve, the 3rd end of described three-way valve is connected to the external compression air duct, be provided with pressure transducer and temperature sensor 1 in the pipeline of described positive/negative-pressure chamber, described pressure transducer and temperature sensor are connected with control module, described control module calculates data on flows with the data of pressure transducer and temperature sensor 1, and described control module also connects and control the switching of described three-way valve simultaneously.
Described control module is provided with display module, and the data that record and calculate are shown.
Described blowback unit is provided with gas tank 3, and solenoid valve 4, and described positive/negative-pressure chamber is connected to described three-way valve by each self-corresponding gas tank and solenoid valve respectively.
The utility model pitot tube flowmeter is to adopt the pressure difference sensing method to realize the measurement of flue gas flow rate.Utilize pitot tube, pressure transducer and temperature sensor to measure the dynamic pressure of flue gas, static pressure and temperature, these parameters and tested flue gas flow rate are certain proportion relation, thus the quantitative flow velocity of flue gas.
Comprise S type pitot tube, thermal resistance, micro-pressure-difference/absolute pressure sensor group, blowback unit and signal control processor etc. among the utility model pitot tube flowmeter embodiment, complete machine is split-type structural.Cabinet is from flanged, and pitot tube is connected connection and is adopted the hood type structure that can separate fast with casing, and installing/dismounting is convenient, is convenient to transportation and carrying.
Armoured thermal resistance that S type pitot tube and sensor adopt adopts the 316L stainless steel material with high-corrosion resistance, adds simultaneously stainless steel protection cover and the anchor ear end cap formula sonde configuration that becomes one.
Control module gathers each sensor signal and processes calculating and control blowback unit, the 4-20mA current signal of flow velocity, dynamic pressure, static pressure and the temperature of active output flue gas of while, and the user can select to access these signals as required.Signal control processor carries display module, need to select the data of observation by button, makes things convenient for user maintenance and debugging.
The blowback unit is comprised of dual-coil electromagnetic valve and two gas tank.The instruction that it sends according to signal processing controller regularly to the blowback of carrying out of pitot tube, prevents the pitot tube latch up phenomenon.The blowback unit is equipped with gas tank and carries out blowback to ensure enough pulse gas.
Automatic back blow of the present utility model unit, can regularly clear up the particle in the pitot tube, blowback can be set interval time, after finishing, blowback cuts off positive/negative-pressure pressure measuring chamber pressure guiding pipe by three-way switch valve, while UNICOM positive/negative pressure-measuring chamber, make positive/negative-pressure chamber pressure balance, at this moment the microprocessor of control module carries out the automatic Calibration at zero point to measuring system.Measure in real time flow velocity, dynamic pressure, static pressure and the temperature of flue gas, by 4 tunnel simulating signal 4-20mA output of isolation.Each measurement data of liquid crystal display and signal, directly reading is convenient to debugging.
The utility model measuring accuracy is high, good reliability, for a long time continuous working.The integral structure of quick-detachment is convenient to packing, transportation and carrying.Carry gas tank, guarantee that enough pulse backblowing gas effectively purges.Integrated flow velocity, dynamic pressure, static pressure and temperature, install and wiring convenient, maintenance is low.Volume is little, compact conformation, and the installing space that needs is little.
Claims (3)
1. pitot tube flowmeter, comprise the positive/negative-pressure chamber, it is characterized in that, also comprise the automatic back blow unit, described automatic back blow unit comprises a three-way valve, described positive/negative-pressure chamber is connected by the wherein two ends of described three-way valve, the 3rd end of described three-way valve is connected to the external compression air duct, be provided with pressure transducer and temperature sensor in the pipeline of described positive/negative-pressure chamber, described pressure transducer and temperature sensor are connected with control module, described control module calculates data on flows with the data of pressure transducer and temperature sensor, and described control module also connects and control the switching of described three-way valve simultaneously.
2. pitot tube flowmeter according to claim 1 is characterized in that, described control module is provided with display module, and the data that record and calculate are shown.
3. pitot tube flowmeter according to claim 1 is characterized in that, described blowback unit is provided with gas tank, and solenoid valve, and described positive/negative-pressure chamber is connected to described three-way valve by each self-corresponding gas tank and solenoid valve respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220546583 CN202915960U (en) | 2012-10-24 | 2012-10-24 | Pitot tube flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220546583 CN202915960U (en) | 2012-10-24 | 2012-10-24 | Pitot tube flow meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202915960U true CN202915960U (en) | 2013-05-01 |
Family
ID=48164267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220546583 Expired - Fee Related CN202915960U (en) | 2012-10-24 | 2012-10-24 | Pitot tube flow meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202915960U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106018876A (en) * | 2016-07-31 | 2016-10-12 | 江阴市嘉臣光电科技有限公司 | Intelligent flowing speed meter |
| CN106840284A (en) * | 2016-12-22 | 2017-06-13 | 汇众翔环保科技河北有限公司 | Based on multitube Pitot tube matrix form flow system and measuring method |
| CN107990946A (en) * | 2017-12-26 | 2018-05-04 | 重庆光可巡科技有限公司 | Easy to the flow sensor for correction of returning to zero |
-
2012
- 2012-10-24 CN CN 201220546583 patent/CN202915960U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106018876A (en) * | 2016-07-31 | 2016-10-12 | 江阴市嘉臣光电科技有限公司 | Intelligent flowing speed meter |
| CN106018876B (en) * | 2016-07-31 | 2019-12-10 | 江苏嘉臣环境科技有限公司 | Intelligent current meter |
| CN106840284A (en) * | 2016-12-22 | 2017-06-13 | 汇众翔环保科技河北有限公司 | Based on multitube Pitot tube matrix form flow system and measuring method |
| CN107990946A (en) * | 2017-12-26 | 2018-05-04 | 重庆光可巡科技有限公司 | Easy to the flow sensor for correction of returning to zero |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130501 Termination date: 20131024 |