CN108168629A - A kind of monitoring device of liquid fertilization pipeline, system and method - Google Patents
A kind of monitoring device of liquid fertilization pipeline, system and method Download PDFInfo
- Publication number
- CN108168629A CN108168629A CN201711293019.XA CN201711293019A CN108168629A CN 108168629 A CN108168629 A CN 108168629A CN 201711293019 A CN201711293019 A CN 201711293019A CN 108168629 A CN108168629 A CN 108168629A
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- housing
- magnetic induction
- monitoring device
- liquid fertilization
- fertilization pipeline
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- 239000007788 liquid Substances 0.000 title claims abstract description 50
- 230000004720 fertilization Effects 0.000 title claims abstract description 42
- 238000012806 monitoring device Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000006698 induction Effects 0.000 claims abstract description 40
- 238000012544 monitoring process Methods 0.000 claims abstract description 17
- 239000003337 fertilizer Substances 0.000 claims abstract description 10
- 230000008859 change Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 2
- 238000005538 encapsulation Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000009434 installation Methods 0.000 description 3
- 235000014676 Phragmites communis Nutrition 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/52—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring the height of the fluid level due to the lifting power of the fluid flow
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The present invention relates to field of plant protection machine, disclose a kind of monitoring device of liquid fertilization pipeline, including：Pipe joint, housing, magnetic induction float, sensor circuit plate and signal output line, housing is middle siphunculus, pipe joint includes connection end, connection end is fixed on the both ends of housing, and with being open, magnetic induction float is slidably set in housing, sensor circuit plate is set on the side of housing, for monitoring the position of magnetic induction float, and electric signal is converted to, analog voltage signal is exported by signal output line.Invention additionally discloses a kind of monitoring system and method for liquid fertilization pipeline, liquid fertilizer pushes magnetic induction float to rise；Sensor circuit plate senses changes of magnetic field, and magnetic signal is converted to analog voltage signal；It is shown by slave computer and host computer, measuring reliably, monitoring in real time, good economy performance is simple and practicable and easy to spread, improves reliability, avoids the production loss that leakage is applied fertilizer, Shaoshi fertilizer is brought.
Description
Technical field
The present invention relates to field of plant protection machine, more particularly to a kind of monitoring device, system and the side of liquid fertilization pipeline
Method.
Background technology
Liquid fertilization is widely studied since utilization rate is high, absorbs the advantages that fast, and liquid fertilization machine uses Multipath tube
Road supplies medicine, in operation process the discovery of pipeline stopping state will occur the phenomenon that Shaoshi fertilizer, leakage fertilising not in time, lack crop fertilizer
It loses, yield is caused to decline.
Current existing spray pipe monitoring device is mostly monitored based on mechanical flowmeter, due to flowmeter installation position
It puts and is unfavorable for operator's observation, its using effect is made to have a greatly reduced quality, and the sensor based on electromagnetic induction principle carries out blocking feelings
The monitoring plurality of condition can only carry out 2 points of detection, and the cost of Multi-point detection is higher；The existing side monitored by flow sensor
Method can be monitored pipeline blockage situation, but flow sensor is expensive, be not suitable for answering for multi-pipeline liquid fertilization machine
With, and wired communication modes are used, multipath signal propagation causes a large amount of wiring problems of signal wire.
Invention content
(1) technical problems to be solved
The object of the present invention is to provide a kind of monitoring device of liquid fertilization pipeline, system and methods, solve the prior art
Middle flow sensor is expensive, is not suitable for the application of multi-pipeline liquid fertilization machine, and connect up the problem of complicated.
(2) technical solution
In order to solve the above technical problem, the present invention provides a kind of monitoring devices of liquid fertilization pipeline, which is characterized in that
Including：Pipe joint, housing, magnetic induction float, sensor circuit plate and signal output line, the housing are middle siphunculus,
The pipe joint includes connection end, and the connection end is fixed on the both ends of the housing, and with opening, described
Magnetic induction float is slidably set in the housing, and the sensor circuit plate is set on the side of the housing, for monitoring
The position of magnetic induction float is stated, and is converted to electric signal, analog voltage signal is exported by the signal output line.
Wherein, the pipe joint further includes locking cap, and the housing both ends are equipped with external screw thread, and the locking cap is set
There is matched internal thread, the connection end is fixed by the threaded connection of the locking cap and the housing.
Wherein, it further includes center and fixes polished rod, the center is fixed polished rod and is perpendicularly fixed in the housing, the magnetic strength
Float is answered to fix polished rod along the center slidably to set.
Wherein, the pipe joint further includes intrusion slot, and the intrusion slot is embedded in the end of the housing, and by
The connection end compresses, and the intrusion slot has runner, and the center is fixed polished rod and consolidated by the intrusion slot at its both ends
It is fixed.
Wherein, the magnetic induction float includes annular magnet, lower housing and capping, and the lower housing, which has, accommodates the ring
The space of shape magnet, the annular magnet are squeezed and are fixed by the lower housing and the capping, the lower housing and the envelope
Lid is slidably sheathed on the center and fixes polished rod.
Wherein, the sensor circuit plate includes signal output terminal and multiple tongue tubes, the tongue tube and the magnetic strength
Float level face is answered to be disposed vertically, the signal output terminal is connect with the signal output line.
Wherein, the tongue tube is arranged along straight line or multiple rows of alternately dislocation is arranged.
Wherein, encapsulating housing is further included, for encapsulating the sensor circuit plate.
Invention additionally discloses a kind of monitoring systems of liquid fertilization pipeline, which is characterized in that including host computer, slave computer,
Analog voltage signal is sent to by the monitoring device of wireless transport module and the liquid fertilization pipeline of the present invention, the monitoring device
Analog voltage signal is parsed piping flow data by the slave computer, slave computer, and is passed through the wireless transport module and transmitted
To the host computer.
Invention additionally discloses a kind of monitoring methods of liquid fertilization pipeline, which is characterized in that including：
S1, liquid fertilizer are entered by one end of transparent shell, and magnetic induction float is pushed to rise；
S2, sensor circuit plate sense magnetic induction float changes of magnetic field caused by distance change, and magnetic signal is turned
It is melted into analog voltage signal；
Analog voltage signal is parsed piping flow data by S3, slave computer, and is passed through wireless transport module and be sent to
Position machine；
Analog voltage signal is converted to real-time traffic data, and shown by S4, host computer.
(3) advantageous effect
A kind of monitoring device of liquid fertilization pipeline provided by the invention, system and method, according to uninterrupted, flow pushes away
Dynamic magnetic induction float induces the position of magnetic induction float by sensor circuit plate, and export simulation electricity to different height position
Signal is pressed, wireless monitor is realized using wireless transport module, parses liquid fertilization piping flow situation, realizes that monitoring liquid is applied
The purpose of fertile pipeline blockage, the present invention measure reliable, monitoring, good economy performance, while have simple and practicable and easy to spread in real time
The advantages of, the fertilising reliability of multi-pipeline liquid fertilization machine is improved, avoids leakage fertilising, the production loss that Shaoshi fertilizer is brought,
Pipeline blockage condition monitoring, which is equipped, for multi-pipeline liquid fertilization provides a solution.
Description of the drawings
Fig. 1 is a kind of structure chart of the monitoring device of liquid fertilization pipeline of the present invention；
Fig. 2 is a kind of magnetic induction Floater Structure figure of the monitoring device of liquid fertilization pipeline of the present invention；
Fig. 3 is a kind of sectional view of the intrusion slot of the monitoring device of liquid fertilization pipeline of the present invention；
Fig. 4 is a kind of vertical view of the intrusion slot of the monitoring device of liquid fertilization pipeline of the present invention；
Fig. 5 is a kind of mechanism map of the sensor circuit plate of the monitoring device of liquid fertilization pipeline of the present invention；
Fig. 6 is a kind of circuit diagram of the sensor circuit plate of the monitoring device of liquid fertilization pipeline of the present invention；
Fig. 7 is a kind of flow chart of the monitoring method of liquid fertilization pipeline of the present invention.
In figure, 1, connection end；2nd, locking cap；3rd, intrusion slot；4th, transparent shell；5th, polished rod is fixed at center；6th, magnetic induction
Float；7th, signal output line；8th, sensor circuit plate；9th, encapsulating housing；10th, it covers；11st, lower housing；12nd, annular magnet；13rd, it does
Reed pipe；14th, signal output terminal.
Specific embodiment
With reference to the accompanying drawings and examples, the specific embodiment of the present invention is described in further detail.Following instance
For illustrating the present invention, but it is not limited to the scope of the present invention.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or be integrally connected；It can
To be mechanical connection or be electrically connected；It can be directly connected, can also be indirectly connected by intermediary, Ke Yishi
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
As shown in Figure 1, a kind of monitoring device of liquid fertilization pipeline, which is characterized in that including：Pipe joint, shell
Body 4, magnetic induction float 6, sensor circuit plate 8 and signal output line 7, housing 4 are middle siphunculus, and pipe joint includes connection
End 1, connection end 1 is fixed on the both ends of housing 4, and with being open, magnetic induction float 6 is slidably set in housing 4, is felt
Circuit board 8 is answered to be set on the side of housing 4, for monitoring the position of magnetic induction float 6, and is converted to electric signal, it is defeated by signal
Outlet 7 exports analog voltage signal.
Specifically, two connection ends 1 one are solution import, one exports for solution, and solution enters from import, pushes
Magnetic induction float 6 rises, specifically, according to the flow velocity size of solution, can determine the height of magnetic induction float, magnetic induction is floated
Son 6 and the different distance of sensor circuit plate 8, can export different electric signals, this electric signal is big with regard to the flow velocity that can reflect solution
It is small.Arrow direction in Fig. 1 is flowed to for liquid.Housing 4 is made of transparent material, is conducive to operator's observation.
A kind of monitoring device of liquid fertilization pipeline provided by the invention, system and method, according to uninterrupted, flow pushes away
Dynamic magnetic induction float induces the position of magnetic induction float by sensor circuit plate, and export simulation electricity to different height position
Signal is pressed, it is of the invention to measure reliable, real-time to monitor, good economy performance, while there is simple and practicable and easy to spread, raising
The fertilising reliability of multi-pipeline liquid fertilization machine avoids leakage fertilising, the production loss that Shaoshi fertilizer is brought, is multi-pipeline liquid
Fertilising equipment pipeline blockage condition monitoring provides a solution.
Wherein, pipe joint further includes locking cap 2, and 4 both ends of housing are equipped with external screw thread, and locking cap 2 is equipped with phase therewith
Matched internal thread, connection end 1 are fixed by locking cap 2 and the threaded connection of housing 4.Company is installed in the end of housing 4
After connecing end 1, locking cap 2 is tightened using screw thread, connection end 1 is fixed by locking cap 2 with housing 4.
Wherein, it further includes center and fixes polished rod 5, center is fixed polished rod 5 and is perpendicularly fixed in housing 4,6 edge of magnetic induction float
Center is fixed polished rod 5 and is slidably set, and magnetic induction float 6 is avoided to be overturn under the impact of solution, reduces measurement error.
Shown as shown in Figure 1, Figure 3 and Figure 4, pipe joint further includes intrusion slot 3, and intrusion slot 3 is embedded in the end of housing 4
Portion, and be connected end 1 and compress, intrusion slot 3 has runner, and center is fixed polished rod 5 and fixed by the intrusion slot 3 at its both ends, interior
Caulking groove 3 fixes polished rod 5 for consolidating center, and runner is used to convey solution.
As shown in Fig. 2, magnetic induction float 6 includes annular magnet 12, lower housing 11 and capping 10, lower housing 11, which has, to be accommodated
The space of annular magnet 12, annular magnet 12 are squeezed by lower housing 11 and capping 10 and fixed, and lower housing 11 and capping 10 can be slided
Polished rod 5 is fixed at the dynamic center that is sheathed on.Specifically, the center of lower housing 11 and capping 10 is equipped with to fix across center in an axial direction
The sliding eye of polished rod 5.The N poles of annular magnet 12 and S are extremely setting up and down, and when installation can arbitrarily select placement direction, can be felt
Circuit board 8 is answered to sense.Specifically, capping 10 and lower housing 11 are bonded by waterproof glue, annular magnet 12 is made to receive waterproof
Protection.
As shown in fig. 6, sensor circuit plate 8 includes signal output terminal 14 and multiple tongue tubes 13, tongue tube 13 and magnetic strength
6 horizontal plane of float is answered to place, signal output terminal 14 is connect with signal output line 7.If Fig. 6 is that a kind of liquid of the present invention is applied
The exclusion circuit diagram of the sensor circuit plate of the monitoring device of fertile pipeline, U1, U2 and U3 identical for resistance value, each resistance string
Connection, both ends connection positive pole and cathode；RS1~RS11 is tongue tube 13, and 13 common end of tongue tube is connect with OUT output terminals,
The other end is sequentially connected the node that each resistance separates in series resistance.It is off-state under 13 conventional sense of tongue tube, works as magnetic strength
When answering float 6 close to tongue tube 13, the tongue tube 13 in induction range is in closed state, dry at different location by being in
The open and close of reed pipe 13, OUT output terminals export different voltage values.Specifically, signal output terminal 14 is just being drawn by power supply
Foot, power supply bear pin and signal output pin, export analog voltage signal.
As shown in figure 5, tongue tube 13 is arranged along straight line or multiple rows of alternately dislocation arrangement, to increase measurement accuracy.And
The total length that tongue tube 13 is arranged in sensor circuit plate 8 is greater than or equal to the linear motion distance of magnetic induction float 6.
Wherein, encapsulating housing 9 is further included, for encapsulating sensor circuit plate 8, waterproofing protection is carried out to sensor circuit plate 8, and
Sensor circuit plate 8 is made to be affixed on housing 4.
The present invention discloses a kind of monitoring system of liquid fertilization pipeline, which is characterized in that including host computer, slave computer, nothing
Analog voltage signal is sent to bottom by the monitoring device of the liquid fertilization pipeline of line transmission module and the present invention, monitoring device
Analog voltage signal is parsed piping flow data by machine, slave computer, and is passed through wireless transport module and be transferred to host computer.
As shown in fig. 7, invention additionally discloses a kind of monitoring methods of liquid fertilization pipeline, which is characterized in that including：
S1, liquid fertilizer are entered by one end of transparent shell, and magnetic induction float is pushed to rise；
S2, sensor circuit plate sense magnetic induction float changes of magnetic field caused by distance change, and magnetic signal is turned
It is melted into analog voltage signal；
Analog voltage signal is parsed piping flow data by S3, slave computer, and is passed through wireless transport module and be sent to
Position machine；
Analog voltage signal is converted to real-time traffic data, and shown by S4, host computer.
Specifically, the correspondence between the position of magnetic induction float and output analog voltage is demarcated by the previous experiment.
Piping flow is different, and magnetic induction float is elapsed to different height and positions, so as to connect the tongue tube in induction range
It is logical, different analog voltage output valves is generated, then parse corresponding to different analog voltage output valves by experiment before
Data on flows.Host computer is shown real-time traffic data by display or interactive interface etc..
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.
Claims (10)
1. a kind of monitoring device of liquid fertilization pipeline, which is characterized in that including：Pipe joint, housing (4), magnetic induction
Float (6), sensor circuit plate (8) and signal output line (7), the housing (4) be middle siphunculus, the pipe joint packet
Connection end (1) is included, the connection end (1) is fixed on the both ends of the housing (4), and with being open, the magnetic induction is floated
Sub (6) are slidably set in the housing (4), and the sensor circuit plate (8) is set on the side of the housing (4), for supervising
The position of the magnetic induction float (6) is surveyed, and is converted to electric signal, exporting analog voltage by the signal output line (7) believes
Number.
2. the monitoring device of liquid fertilization pipeline as described in claim 1, which is characterized in that the pipe joint also wraps
Locking cap (2) is included, housing (4) both ends are equipped with external screw thread, and the locking cap (2) is equipped with matched internal thread, institute
Connection end (1) is stated to fix by the locking cap (2) and the threaded connection of the housing (4).
3. the monitoring device of liquid fertilization pipeline as described in claim 1, which is characterized in that further include center and fix polished rod
(5), the center is fixed polished rod (5) and is perpendicularly fixed in the housing (4), and the magnetic induction float (6) is consolidated along the center
Determine polished rod (5) slidably to set.
4. the monitoring device of liquid fertilization pipeline as claimed in claim 3, which is characterized in that the pipe joint also wraps
Intrusion slot (3) is included, the intrusion slot (3) is embedded in the end of the housing (4), and is compressed by the connection end (1), described
Intrusion slot (3) has runner, and it is fixed by the intrusion slot (3) at its both ends that polished rod (5) is fixed at the center.
5. the monitoring device of liquid fertilization pipeline as claimed in claim 3, which is characterized in that magnetic induction float (6) packet
Annular magnet (12), lower housing (11) and capping (10) are included, the lower housing (11), which has, accommodates the annular magnet (12)
Space, the annular magnet (12) are squeezed and are fixed by the lower housing (11) and the capping (10), the lower housing (11)
The center, which is slidably sheathed on, with the capping (10) fixes polished rod (5).
6. the monitoring device of liquid fertilization pipeline as described in claim 1, which is characterized in that sensor circuit plate (8) packet
Signal output terminal (14) and multiple tongue tubes (13) are included, the tongue tube (13) is hung down with magnetic induction float (6) horizontal plane
Straight to place, the signal output terminal (14) connect with the signal output line (7).
7. the monitoring device of liquid fertilization pipeline as claimed in claim 6, which is characterized in that the tongue tube (13) is along one
Straight line is arranged or multiple rows of alternately dislocation arrangement.
8. the monitoring device of liquid fertilization pipeline as described in claim 1, which is characterized in that further include encapsulating housing (9), use
In the encapsulation sensor circuit plate (8).
9. a kind of monitoring system of liquid fertilization pipeline, which is characterized in that including host computer, slave computer, wireless transport module and
The monitoring device of liquid fertilization pipeline in claim 1-8 described in any one, the monitoring device is by analog voltage signal
The slave computer is sent to, analog voltage signal is parsed piping flow data by slave computer, and passes through the wireless transmission mould
Block is transferred to the host computer.
10. a kind of monitoring method of liquid fertilization pipeline, which is characterized in that including：
S1, liquid fertilizer are entered by one end of transparent shell, and magnetic induction float is pushed to rise；
S2, sensor circuit plate sense magnetic induction float changes of magnetic field caused by distance change, and magnetic signal is converted to
Analog voltage signal；
Analog voltage signal is parsed piping flow data by S3, slave computer, and is passed through wireless transport module and be sent to host computer；
Analog voltage signal is converted to real-time traffic data, and shown by S4, host computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711293019.XA CN108168629A (en) | 2017-12-08 | 2017-12-08 | A kind of monitoring device of liquid fertilization pipeline, system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711293019.XA CN108168629A (en) | 2017-12-08 | 2017-12-08 | A kind of monitoring device of liquid fertilization pipeline, system and method |
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| Publication Number | Publication Date |
|---|---|
| CN108168629A true CN108168629A (en) | 2018-06-15 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711293019.XA Pending CN108168629A (en) | 2017-12-08 | 2017-12-08 | A kind of monitoring device of liquid fertilization pipeline, system and method |
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| Country | Link |
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| CN (1) | CN108168629A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112665665A (en) * | 2020-11-27 | 2021-04-16 | 北京电子科技职业学院 | Gas flow sensor |
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| CN87204365U (en) * | 1987-06-25 | 1988-04-13 | 中南工业大学 | Flow indicator with magnetic control in well drilling |
| JP2003021548A (en) * | 2001-07-09 | 2003-01-24 | Seiden Kogyo:Kk | Liquid supply detecting device and its use method and device |
| CN2746371Y (en) * | 2004-05-15 | 2005-12-14 | 辽河石油勘探局 | Multi-phase flow sensor with test floater |
| CN1967160A (en) * | 2005-11-18 | 2007-05-23 | 王永忠 | Wide-range float type flow sensor |
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| CN201464182U (en) * | 2009-07-16 | 2010-05-12 | 天津大学 | Highly sensitive vortex flowmeter for gas measurement |
| CN104957006A (en) * | 2015-04-13 | 2015-10-07 | 宁波大叶园林科技有限公司 | Energy-saving single-magnet type electromagnetic flowmeter, circuit and magnetic circuit all for agricultural irrigation |
| CN105973323A (en) * | 2016-06-16 | 2016-09-28 | 福建农林大学 | Automatic detecting device for preventing water and fertilizer drip irrigation system from being blocked and detecting method thereof |
| US20170050834A1 (en) * | 2007-09-06 | 2017-02-23 | Deka Products Limited Partnership | Product Dispensing System |
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2017
- 2017-12-08 CN CN201711293019.XA patent/CN108168629A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87204365U (en) * | 1987-06-25 | 1988-04-13 | 中南工业大学 | Flow indicator with magnetic control in well drilling |
| JP2003021548A (en) * | 2001-07-09 | 2003-01-24 | Seiden Kogyo:Kk | Liquid supply detecting device and its use method and device |
| CN2746371Y (en) * | 2004-05-15 | 2005-12-14 | 辽河石油勘探局 | Multi-phase flow sensor with test floater |
| CN1967160A (en) * | 2005-11-18 | 2007-05-23 | 王永忠 | Wide-range float type flow sensor |
| US20170050834A1 (en) * | 2007-09-06 | 2017-02-23 | Deka Products Limited Partnership | Product Dispensing System |
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| CN201464182U (en) * | 2009-07-16 | 2010-05-12 | 天津大学 | Highly sensitive vortex flowmeter for gas measurement |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112665665A (en) * | 2020-11-27 | 2021-04-16 | 北京电子科技职业学院 | Gas flow sensor |
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Application publication date: 20180615 |