CN201355259Y - Flowmeter and fluid oscillator thereof - Google Patents
Flowmeter and fluid oscillator thereof Download PDFInfo
- Publication number
- CN201355259Y CN201355259Y CNU200820214163XU CN200820214163U CN201355259Y CN 201355259 Y CN201355259 Y CN 201355259Y CN U200820214163X U CNU200820214163X U CN U200820214163XU CN 200820214163 U CN200820214163 U CN 200820214163U CN 201355259 Y CN201355259 Y CN 201355259Y
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- fluid
- inlet
- wall
- sprue
- main flow
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Abstract
The utility model discloses a flowmeter and a fluid oscillator thereof. The flowmeter comprises a main flow inlet, a main flow outlet, and a fluid oscillator with a main flow channel of the fluid; the main flow channel is a channel formed by encircling with fluid adhering walls arranged on two sides, an upper wall and a lower wall; and the inlet and the outlet of the main flow channel are respectively connected with the main flow inlet and the main flow outlet of the flowmeter, and the caliber of the place where the main flow inlet of the flowmeter is connected with the inlet of the main flow channel is less than or equal to the caliber of the inlet of the main flow channel. The flowmeter can improve the accuracy and reliability of the fluid measurement.
Description
Technical field
The utility model relates to measuring equipment, particularly relates to flow instrument and the fluidic oscillator thereof of measuring fluid.
Background technology
The prior art flow instrument generally is used to measure fluid volume, and its principle comes from fluidic oscillator.When fluid when having the flow instrument of fluidic oscillator, fluid produces vibration in fluidic oscillator, and oscillation frequency is by the fluid-flow rate decision by it.The speed of the oscillation frequency measurable flow body by fluidic oscillator, and then obtain volume by fluid.
Consult Fig. 1 and Fig. 2, publication number is to disclose a kind of instrument in the patented claim of CN101194146, and it comprises fluidic oscillator 1.Described fluidic oscillator 1 comprises body 2, and body 2 comprises that the fluid that limits a plurality of flow paths adheres to wall 20.Body 2 limits intake section 3, exit portion 4 and is positioned between the two main channel 5.Body 2 also limits feedback assembly, and this feedback assembly comprises two 5 separation from the main channel, reboots the loop feedback passage 6,7 that converges with main channel 5 in neighboring entry part 3 then.Shunt 8 is positioned at the center of main channel 5, between the separation and point of feedback channel 6,7.Intake section 3 comprises a narrow hole from inlet tube (not shown) reception stream, and this inlet tube is connected to intake section 3 by screw thread 10 and connects.Similarly, exit portion 4 is suitable for receiving an outlet (not shown) that is connected thereto by screw thread 9.
The fluid that receives by intake section 3 is by the flow path of main channel 5, and by means of wall attachment effect with on himself " adhere to " in the surface 12 or 13 one.Shunt 8 impels in the fluid deflection neighbouring surface 12,13 one or another.If fluid " adheres to " on surface 12, then its major part flows around feedback channel 6.When this fed-back fluid entered main channel 5, the fluid with interference is come in from intake section 3 " adhered to " to another surface 13 it.Therefore 4 fluid vibrates following two states from intake section 3 to exit portion, promptly " adheres to " on surface 12 and major part flows through feedback channel 6, and " adhering to " on surface 13 and major part flow through feedback channel 7.The flow by instrument is depended in these vibrations.
For described flow is measured, fluidic oscillator comprises pick-up unit 11.Pick-up unit 11 comprises that being installed in fluid adheres to permanent magnet 14,15 in the wall 20, as field generator for magnetic.14,15 pairs of magnets main channel 5 fluids of flowing through apply magnetic field.Pick-up unit 11 also comprises the electrode 16,17,18 that is used for detecting the synthetic electromotive force that produces in the oscillatory flow.Electrode 16,17,18 comprises the metal cylinder member of the roof 19 that extends through body 2.The far-end 21 of electrode 16,17,18, (indicate), 23 are passed in the flow path that body 2 stretches into main channel 5.The interior synthetic electromotive force that is produced own carried out electromagnetic detection to vibration when electrode 16,17,18 can be used to test fluid by magnetic field.Pass through the corresponding relation of the frequency-fluid velocity-volume of fluid oscillating frequency-alternating voltage signal at last, calculate the speed or the volume of fluid by the frequency of detected alternating voltage signal.
As everyone knows, the cavity design of fluidic oscillator is extremely important, because can it play decisive role to forming fluid oscillating, also the oscillating fluid form that whether can form the coincidence detection accuracy requirement is played decisive role.But prior art is not proposing requirements at the higher level aspect the cavity design of fluidic oscillator, such as fluid when intake section 3 enters into main channel 5, because it is big that intake section 3 closes on 5 porch, aperture efficiency main channel of main channel 5, form the situation that thicker fluid enters narrower main channel 5 inlets, on the one hand thereby fluid is hindered the influence fluid of flowing through herein and is adhered to the form of the fluid of wall 20, and then influences the degree of accuracy of detection signal; Fluid can collide the feedback channel 6,7 of main channel 5 inlet peripheries on the other hand, and interference feedback stream reenters main channel 5, influences normal fluid oscillating process, therefore is difficult to guarantee to influence the stability and the precision of fluid detection.
The utility model content
For solving prior art flow instrument fluidic oscillator main flow inlet and not adaptive fluid measurement stability and the lower technological deficiency of precision of causing of main channel size, the utility model provides a kind of flow instrument and fluidic oscillator thereof, can effectively improve the precision and the stability of fluid measurement.
An aspect of the present utility model provides a kind of flow instrument, comprise main flow inlet, main flow outlet and fluidic oscillator with fluid sprue, described sprue is to adhere to wall and upper and lower wall surrounds the passage that forms by two side liquids, its entrance and exit connects described flow instrument main flow inlet and main flow outlet respectively, and the bore of described flow instrument main flow inlet and described sprue inlet joint is less than or equal to the bore of described sprue inlet.
In the more excellent embodiment, described two side liquids adhere between the wall angle 10～70 the degree between scope in.
In the more excellent embodiment, also comprise a plurality of detecting electrodes that are arranged at described sprue upper wall or lower wall, the surface area of at least one described detecting electrode and fluid contact portion is at 0.1～300mm
2Between.
In the more excellent embodiment, described a plurality of electrodes all are arranged at the upper wall of described sprue or all are arranged at described lower wall.
In the more excellent embodiment, a part is arranged at described upper wall or the lower wall that contiguous described fluid adheres to wall in described a plurality of electrodes, and another part is arranged at described two and adheres to wall middle described upper wall or lower wall.
In the more excellent embodiment, describedly be arranged at the place, upper reaches that two partial electrodes that adhere to upper wall in the middle of the wall or lower wall place are positioned at other electrodes.
Comprise that further convection cell carries out the fairing of rectification, described fairing is the sheet mechanism with a plurality of fluid through-holes, is arranged at described fluidic oscillator fluid path inlet; Perhaps described fairing is the wedge shape runner with certain-length, big opening one side of described wedge shape runner outwardly, smaller opening connects described fluidic oscillator inlet; Perhaps described fairing comprises sheet mechanism with a plurality of fluid through-holes and the wedge shape runner with certain-length, the big described sheet of the opening one side joint mechanism of described wedge shape runner, and smaller opening connects described fluidic oscillator fluid path inlet.
In the more excellent embodiment, further comprise the splitter plate that is arranged at sprue central authorities, be provided with the vortex cavity between described splitter plate and the outlet of described fluid path.
Another aspect of the present utility model provides a kind of fluidic oscillator, comprise the fluid sprue, described sprue is to adhere to wall and upper and lower wall surrounds the passage that forms by two side liquids, its entrance and exit connects described flow instrument main flow inlet and main flow outlet respectively, and the bore of described flow instrument main flow inlet and described sprue inlet joint is less than or equal to the bore of described sprue inlet.
In the more excellent embodiment, described two side liquids adhere between the wall angle 10～70 the degree between scope in.
The beneficial effects of the utility model are: be different from prior art fluidic oscillator main flow inlet and not adaptive fluid measurement stability and the lower technical scheme of precision of causing of main channel size, the utility model is designed to bore less than described sprue inlet with described flow instrument main flow inlet calibre, make the fluid that enters from flow instrument main flow inlet can enter vibration chamber sprue in the clear, be beneficial to and form the regular form and the stable fluid velocity and the flow direction, thereby can detect the stable flow rate signal, effectively improve the precision and the degree of stability of fluid measurement.
Description of drawings
Fig. 1 is a diagrammatic cross-section of prior art flow instrument;
Fig. 2 is another diagrammatic cross-section of prior art flow instrument;
Fig. 3 is the schematic perspective view of the utility model flow instrument one embodiment;
Fig. 4 is the three-dimensional exploded view of Fig. 3 flow instrument;
Fig. 5 is the cut-open view of A-A ' direction among Fig. 3;
Fig. 6 is the synoptic diagram of fluidic oscillator among Fig. 3;
Fig. 7 is the cut-open view of B-B ' direction among Fig. 5;
Fig. 8 is the cut-open view of C-C ' direction among Fig. 5;
Fig. 9 is the front schematic view of an electrode among Fig. 8.
Embodiment
Below in conjunction with drawings and embodiments the utility model is further specified.
Please refer to Fig. 3, is the schematic perspective view of the utility model flow instrument embodiment.Described flow instrument comprises table body 300.Described table body 300 comprise fluidic oscillator 320 (showing) as Fig. 4 with fluid path and be connected on respectively as described in inlet connection 210, the discharge connection 220 of fluid path inlet, outlet.
Consult Fig. 4, described table body 300 also comprises watchcase 310 and is arranged on described fluidic oscillator 320 in the watchcase 310.Described watchcase 310 dual-sides have opening 311 (opposite side does not show), the inlet 321 of described fluidic oscillator 320 fluid paths and main flow outlet 322 (showing as Fig. 5) outside have screw thread, described accordingly inlet connection 210 and discharge connection 220 respective end inboards have screw thread, utilize described screw thread, the inlet 321 of described fluidic oscillator 320 and main flow outlet 322 screw in described inlet connection 210 and discharge connection 220 respectively, and described inlet connection 210 and discharge connection 220 pass the opening 311 of described watchcase 310 dual-sides respectively, adopt clamp nut 376 to be fixed on the described watchcase 310 then.
For increasing watertightness, between described inlet connection 210 and clamp nut 376, and between discharge connection 220 and clamp nut 376, O RunddichtringO 373,375 and grommet type seals 374 are set.
Can produce fluid oscillating in the fluid path of described fluidic oscillator 320, and adopt electrode 331,332,333 to be arranged on the detection of wherein carrying out oscillation frequency.Described fluidic oscillator 320 loam cake 357 and base plate 353 respectively be set up and down.Also be provided with fluidic oscillator cover plate 359 and silicagel pad 351 between described fluidic oscillator 320 and the base plate 353 from top to bottom.Adopt ultra-sonic welded technology to weld between described fluidic oscillator cover plate 359 and the fluidic oscillator 320.Also be provided with nameplate 355, main control board 334, waterproof Figure 35 4 and sample circuit plate 335 between described fluidic oscillator 320 and the loam cake 357 from top to bottom.Described sample circuit plate 335 and main control board 334 are by battery component 361 power supplies.Described loam cake 357 has the window (not indicating) that holds registration window diaphanoscope 356.Comprise also above the described loam cake 357 that one is renovated 358, can open and watch the flow registration above the main control board 334 in the flow instrument.
Consult Fig. 5 together, the fluid path of described fluidic oscillator 320 comprises inlet 321, wedge shape runner 323, main flow inlet 324, sprue 325 and the main flow outlet 322 that is communicated with successively.The fluid path of described fluidic oscillator 320 also comprises sprue 325 and exports the feedback runner 328 of 322 places to the both sides fork near main flow.
Described sprue 325 be by two side liquids adhere to wall 341 and upper wall 337, lower wall 338 surrounds the passage that forms.Described feedback runner 328 is by feedback flow inlet 326 straight-through sprue inlets.In the central authorities of sprue 325, also be provided with splitter plate 329.
Described sprue 325 both sides are that fluid adheres to wall 341.The vibration of the swing type of fluid rule is detected by pick-up unit, and described pick-up unit comprises that being positioned at described fluid adheres to field generator for magnetic 343, sample circuit and connected a plurality of detecting electrode 331,332,333 outside wall 341 outside surfaces.In addition, to adhere to the outside surface of wall 341 are magnet applying walls 342 to described fluid.Described field generator for magnetic 343 comprises pressing close to that described fluid adheres to the pair of magnets 344 that wall 341 outside surfaces are provided with.Described magnet 344 can be positioned at apart from fluid and adhere to wall 341 inside surfaces 0～50mm mm distance, to obtain magnetic pumping effect preferably.
Consult Fig. 6, fluidic oscillator 320 sprues 325 entrance and exits connect described flow instrument main flow inlet 324 and main flow outlet 322 respectively, described flow instrument main flow inlet 324 is less than or equal to the bore L2 that described sprue 325 enters the mouth with the bore L1 of described sprue 325 inlet joints, and described flow instrument main flow inlet 324 is over against described sprue 325 inlets.
As can be seen, be different from prior art fluidic oscillator main flow inlet and not adaptive fluid measurement stability and the lower technical scheme of precision of causing of main channel size, the utility model is designed to bore L2 less than described sprue 325 inlets with the described flow instrument main flow 324 bore L1 that enter the mouth, make from flow instrument main flow inlet 324 fluids that enter and to enter vibration chamber sprue 325 in the clear, even adhere under the situation of wall 341 in fluid directive one side, fluid also can enter vibration chamber sprue 325 substantially in the clear, be beneficial to and form the regular form and the stable fluid velocity and the flow direction, thereby can detect the stable flow rate signal, effectively improve the precision and the degree of stability of fluid measurement.
In addition, described two side liquids adhere between the wall 341 angle D 10～70 the degree between scope in.
Consult Fig. 7 and Fig. 8 more together, described a plurality of electrodes comprise be arranged at contiguous described fluid adhere to wall 341 upper wall 337 a pair of detecting electrode 331,332 and be arranged at described two electrodes 333 that adhere to described lower wall 338 places in the middle of the wall 341.Consult Fig. 9, described electrode 331 comprises electrode cylinder 3311, in the electrode neck 3312 of electrode cylinder 3,311 one ends and electrode contact portion 3313, at the electrode afterbody 3314 of electrode cylinder 3311 other ends.The end face of described electrode contact portion 3313 is and fluid electrodes in contact surface of contact 3315.Two electrode 332,333 similar in addition, wherein, the electrode contact surface 3315 of electrode 333 is bigger, and electrode neck 3312 and electrode contact portion 3313 are also bigger.In addition, the surface area of described detecting electrode 331,332,333 and fluid contact portion is at 0.1～300mm
2Between.
With the flow direction reference of fluid at sprue 325, the described electrode 331 that is close to the upper wall place 337 of adhering to wall 341 that is arranged at, 332 are arranged in the stream of sprue 325, described two electrodes 333 that adhere to the lower wall place 338 of wall 341 centres that are arranged at are positioned at electrode 331,332 place, upper reaches, and all electrode 331,332,333 is positioned at before the described splitter plate 329.Described pick-up unit also comprises the sampling exciting bank that is connected to described detecting electrode 331,332,333.Described detecting electrode 331,332 passes described upper wall 337 from fluidic oscillator 320 outsides and stretches to the described fluid path.
As can be seen, being different from prior art is arranged at electrode at flow instrument fluidic oscillator main channel terminal position and causes the not high technical scheme of fluid measurement precision, the utility model is with electrode 331,332,333 are arranged at the middle stream and the place, upper reaches of flow instrument fluidic oscillator 320 sprues 325, because of the stream and the structure at upper reaches in fluidic oscillator 320 sprues 325 comparatively narrow, and vibration fluid alternately takes place also just in time to be formed at the place, upper reaches of sprue 325, therefore this position is beneficial to fluid and forms the regular form and the stable speed and the flow direction, thereby electrode 331,332,333 can be in this position probing to stable signal, signal disturbs little, and signal errors is little, effectively improves the precision and the degree of stability of fluid measurement.
And described electrode 331,332,333 is separately positioned on upper wall 337 and lower wall 338, and the phase mutual edge distance is opened, and makes things convenient for the manufacturing of fluidic oscillator 320.
In addition, whole electrodes 331,332,333 are arranged on before the splitter plate 329, reduce the interference of splitter plate 329 convection cells, make electrode 331,332,333 can detect all the time stable, disturb little signal.
The utility model flow instrument can its fluidic oscillator 320 fluid paths inlet 321 or before the position fairing is set.
Consult Fig. 5 again, described fairing can be the sheet mechanism 380 with a plurality of fluid through-holes, is arranged at described fluidic oscillator fluid path inlet; Perhaps
Described fairing is the wedge shape runner with certain-length, big opening one side of described wedge shape runner outwardly, smaller opening connects described fluidic oscillator inlet; Perhaps
Described fairing comprises sheet mechanism 380 with a plurality of fluid through-holes and the wedge shape runner with certain-length, the big described sheet of the opening one side joint mechanism of described wedge shape runner, and smaller opening connects described fluidic oscillator fluid path inlet.
The inventor can obviously improve the low discharge characteristic simultaneously through discovering that the measurement of described fairing convection cell is extremely important.Wherein, wedge shape runner 323 is rectified into jet with fluid.The rectification principle of described wedge shape runner 323 is such: fluid flows to the rectangle outlet of narrow shape from wealthy mouth, fluid progressively is extruded with the jet that forms obvious wall attachment effect of certain speed, the fluid that can further obtain stable oscillation stationary vibration and have regular attached wall shape, with by electrode 331,332,333 accurately detect.
In the present embodiment, for further obtaining the stable oscillatory body, between described splitter plate 329 and described fluid path main flow outlet 322, be provided with the vortex cavity 327 of specifically created fluid whirl.The inventor finds that after deliberation tangible vortex can be obtained in the vortex cavity 327 that exports the setting of 322 places in splitter plate 329 behind to main flows, and this vortex is extremely important to forming stable fluid oscillating.
In addition, described discharge connection 220 also is provided with the unidirectional guiding device 390 that prevents reverse fluid flow.Described unidirectional guiding device 390 can be obtained following technique effect:
1, allow the flow instrument can't operate as normal when oppositely installing, this device has been arranged, when flow instrument was oppositely installed, fluid can't pass through;
When 2, the existence of unidirectional guiding device 390 had guaranteed the flow instrument operate as normal, fluidic oscillator 320 inside were full of fluid, guaranteed that electrode 331,332,333 can touch fluid all the time, guaranteed the sample circuit operate as normal, and further guaranteed the precision of measurement.
As can be seen, be different from the prior art flow instrument before measurement, flow is not carried out rectification and cause the regularity of flow size and shape relatively poor, the not high technological deficiency of fluid measurement precision, the utility model flow instrument its fluidic oscillator 320 fluid paths inlet 321 or before the position fairing is set, just carry out effective rectification before in fluid enters fluidic oscillator 320, vibrating, thereby can obtain the regularity and the comparatively stable oscillation frequency of flow size, shape preferably, further improve the precision and the degree of stability of fluid measurement;
In addition, the unidirectional guiding device 390 that is provided with at described discharge connection 220 can further guarantee the precision measured;
In addition, the vortex cavity 327 that is provided with between described splitter plate 329 and described fluid path main flow outlet 322 can further make fluidic oscillator 320 obtain stable fluid oscillating all the time, further guarantees the precision of fluid measurement.
What deserves to be explained is, the utility model flow instrument of said structure be for convenient describe for an example, other embodiments of the utility model flow instrument are not limited to said structure.Should be appreciated that as long as the bore of flow instrument main flow inlet and fluidic oscillator sprue inlet joint is less than or equal to the bore of described sprue inlet, the flow instrument with this core texture all belongs to the utility model protection domain.
More than a kind of flow instrument provided by the utility model and fluidic oscillator thereof are described in detail, used specific case herein principle of the present utility model and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present utility model and thought thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present utility model, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.
Claims (10)
1. flow instrument, comprise main flow inlet, main flow outlet and fluidic oscillator with fluid sprue, described sprue is to adhere to wall and upper and lower wall surrounds the passage that forms by two side liquids, its entrance and exit connects described flow instrument main flow inlet and main flow outlet respectively, it is characterized in that described flow instrument main flow inlet is less than or equal to the bore that described sprue enters the mouth with the bore of described sprue inlet joint.
2. flow instrument according to claim 1 is characterized in that: described two side liquids adhere between the wall angle 10～70 the degree between scope in.
3. flow instrument according to claim 1 is characterized in that: also comprise a plurality of detecting electrodes that are arranged at described sprue upper wall or lower wall, the surface area of at least one described detecting electrode and fluid contact portion is at 0.1～300mm
2Between.
4. flow instrument according to claim 3 is characterized in that: described a plurality of electrodes all are arranged at the upper wall of described sprue or all are arranged at described lower wall.
5. flow instrument according to claim 3 is characterized in that: a part is arranged at described upper wall or the lower wall that contiguous described fluid adheres to wall in described a plurality of electrodes, and another part is arranged at described two and adheres to wall middle described upper wall or lower wall.
6. flow instrument according to claim 5 is characterized in that: describedly be arranged at the place, upper reaches that two partial electrodes that adhere to upper wall in the middle of the wall or lower wall place are positioned at other electrodes.
7. according to each described flow instrument of claim 1 to 6, it is characterized in that: comprise that further convection cell carries out the fairing of rectification,
Described fairing is the sheet mechanism with a plurality of fluid through-holes, is arranged at described fluidic oscillator fluid path inlet; Perhaps
Described fairing is the wedge shape runner with certain-length, big opening one side of described wedge shape runner outwardly, smaller opening connects described fluidic oscillator inlet; Perhaps
Described fairing comprises sheet mechanism with a plurality of fluid through-holes and the wedge shape runner with certain-length, the big described sheet of the opening one side joint mechanism of described wedge shape runner, and smaller opening connects described fluidic oscillator fluid path inlet.
8. according to each described flow instrument of claim 1 to 6, it is characterized in that: further comprise the splitter plate that is arranged at sprue central authorities, be provided with the vortex cavity between described splitter plate and the outlet of described fluid path.
9. fluidic oscillator that is applied to flow instrument, comprise the fluid sprue, described sprue is to adhere to wall and upper and lower wall surrounds the passage that forms by two side liquids, its entrance and exit connects described flow instrument main flow inlet and main flow outlet respectively, it is characterized in that described flow instrument main flow inlet is less than or equal to the bore that described sprue enters the mouth with the bore of described sprue inlet joint.
10. fluidic oscillator according to claim 9 is characterized in that: described two side liquids adhere between the wall angle 10～70 the degree between scope in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820214163XU CN201355259Y (en) | 2008-12-02 | 2008-12-02 | Flowmeter and fluid oscillator thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820214163XU CN201355259Y (en) | 2008-12-02 | 2008-12-02 | Flowmeter and fluid oscillator thereof |
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| Publication Number | Publication Date |
|---|---|
| CN201355259Y true CN201355259Y (en) | 2009-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200820214163XU Expired - Fee Related CN201355259Y (en) | 2008-12-02 | 2008-12-02 | Flowmeter and fluid oscillator thereof |
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| CN (1) | CN201355259Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519525A (en) * | 2011-11-24 | 2012-06-27 | 宁波水表股份有限公司 | Jet oscillation water flow sensor |
| CN102599036A (en) * | 2012-03-21 | 2012-07-25 | 江苏大学 | Oscillation pulsed drip irrigation emitter and drip irrigation device |
| WO2017031702A1 (en) * | 2015-08-25 | 2017-03-02 | 深圳市思达仪表有限公司 | Flow instrument and jet flow oscillator thereof |
| CN111829600A (en) * | 2019-04-22 | 2020-10-27 | 中国石油天然气股份有限公司 | Metering device and metering method for micro-upgrade flow |
-
2008
- 2008-12-02 CN CNU200820214163XU patent/CN201355259Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519525A (en) * | 2011-11-24 | 2012-06-27 | 宁波水表股份有限公司 | Jet oscillation water flow sensor |
| CN102519525B (en) * | 2011-11-24 | 2013-10-09 | 宁波水表股份有限公司 | Jet oscillation water flow sensor |
| CN102599036A (en) * | 2012-03-21 | 2012-07-25 | 江苏大学 | Oscillation pulsed drip irrigation emitter and drip irrigation device |
| WO2017031702A1 (en) * | 2015-08-25 | 2017-03-02 | 深圳市思达仪表有限公司 | Flow instrument and jet flow oscillator thereof |
| CN111829600A (en) * | 2019-04-22 | 2020-10-27 | 中国石油天然气股份有限公司 | Metering device and metering method for micro-upgrade flow |
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| 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: 20091202 Termination date: 20141202 |
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| EXPY | Termination of patent right or utility model |