CN1013306B - Method and device for detecting fluid flow rate - Google Patents
Method and device for detecting fluid flow rateInfo
- Publication number
- CN1013306B CN1013306B CN 86105519 CN86105519A CN1013306B CN 1013306 B CN1013306 B CN 1013306B CN 86105519 CN86105519 CN 86105519 CN 86105519 A CN86105519 A CN 86105519A CN 1013306 B CN1013306 B CN 1013306B
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- piston
- passage
- fluid
- flow rate
- pressure
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Abstract
The present invention relates to a method and a device for detecting a fluid flow rate, wherein the device comprises a body which is formed into a fluid passage; the fluid passage is at least provided with two different cross sections; the device also comprises a piston which is provided with two surfaces to be matched with a piston chamber; the piston and the piston chamber delimit two regions which are respectively arranged outsides the two surfaces; the device also comprises a mechanism which makes the piston return to an initial state or a stationary state; the pressure of each region is respectively equal to the pressure of the two cross sections in the fluid passage in fact.
Description
The present invention relates to detect the device and method of flow rate in field of oil drilling, special relevant with field operation in drilling well.In fact, when the sort of operation, usually need to send information to the shaft bottom, particularly in order to start and shut-down mechanism from ground.
Conventional technology is to adopt cable or send a ball from the surface.The major defect of first kind of technology is, can not rotate or needs very expensive drilling rod cooperating equipment at least owing to comprise the drill set of cable, and its application only limits to the turbine drilling well.Little the usage that ball is discharged in the drilling rod to the use influence of drilling rod, but surveying instrument that uses in some drilling well and boring end motor and turbine do not allow this ball to pass through.
Prior art can be consulted following file US-A-1,635,040, US-A-3,717,208, DE-A-2,643,996.
The invention provides sensor at the bottom of a kind of hole, it can experience one or several flow rate threshold value.By the flow through drilling fluid flow rate of this sensor of correct adjusting, sensor can detect one or several signal of sending here from ground or message at the bottom of the hole.
In addition, this sensor can be set up overvoltage in the upstream of device, can operate different mechanisms with it.
Apparatus of the present invention comprise body, piston and make this piston be returned to the mechanism of initial or stationary state.Body constitutes the passage of detected fluid.Piston also can be described as the detecting device piston, and it has two faces to cooperate with piston chamber, and piston and piston chamber limit two separated districts, respectively in the outside on this piston two sides.
Passage itself comprises two different xsects at least.
In fact the pressure in each district equate with the pressure of one of two xsects in the passage.Passage can have the shape of Venturi tube, and promptly it can then be made of an expansion section a narrow.
Piston can have a sufficiently long stroke, makes it block the passage that fluid flows through in motion up to small part.
Piston chamber can be cylindrical shape, and its latus rectum is in fact vertical with the flow direction of fluid in passage.
One of them district discussed above can be communicated with the cross section of minimum.
Apparatus of the present invention can comprise several pistons, and each piston comprises suitable with it response agency in addition.At least one of them district that is limited by piston can be communicated with by movable or deformable wall with xsect in the passage.
Apparatus of the present invention can comprise the system that detects piston motion.
Apparatus of the present invention can comprise an auxiliary piston, two districts of itself regulation, and the pressure in one of them district and the passage on the cross section equates substantially.
The detecting device piston can have a sufficiently long stroke, can remove to promote auxiliary piston because of its motion causes the increase of pressure.
Auxiliary piston can support fluid passage and detecting device piston in a kind of remodeling of the present invention.
Within the scope of the invention still, this device can have a conduit to be communicated with one of them district that one of them is distinguished and the detecting device piston limits that auxiliary piston limits.In fact the pressure that another conduit makes these two districts equate with the pressure that is positioned on the xsect of detecting device piston upstream by flow direction in the passage.
The present invention also provides the method that detects at least one threshold value flow rate of certain fluid and control the action that is produced by this flow rate.This method makes this fluid by having the passage of two varying cross-sections at least, and when reaching threshold flow rate, passage to small part gets clogged to cause that this hydrodynamic pressure descends, and the pressure differential that is applied in the existence of hamper both sides is as control action.
The present invention will be described in conjunction with the accompanying drawings by way of example, and Fig. 1 and Fig. 2 show the simple embodiment of apparatus of the present invention in a capsule,
Fig. 3 is given in the stationary installation pressure differential as the variation characteristic curve of flow velocity function,
Fig. 4 illustrates another embodiment of the present invention,
Fig. 5 is presented at system of the present invention upstream pressure change curve under the specified criteria,
Fig. 6,7,8,9,10 and 11 shows the various improvement types and different application of system of the present invention.
Fig. 1 has shown a kind of embodiment of apparatus of the present invention briefly.
This device comprises:
A baffle is connected on the front of expansion section, Venturi tube 1 fluid passage.At least constitute a bore hole 20 in the Venturi tube, the axle in hole is in fact vertical by the flow direction of Venturi tube with fluid.This bore hole opening is in Venturi tube, and the xsect of the fluid passage SC of this place is less than Venturi tube fluid passage inlet SE xsect or outlet SS xsect.This section S C is minimum cross section, fluid passage in the Venturi tube preferably, but also other.In the situation of Fig. 1, between expansion section and baffle, there is the district of constant cross-section;
The piston 2 that cooperates with bore hole 20, cylindrical shape preferably, it has two faces to be designated as 17,23, and two districts of qualification are designated as 24 and 15;
Make piston get back to the system of piston chamber, apply with piston and stretch out the opposite restoring force F of direction.This answering system has following parts to constitute, and bar 3 is formed integral body with piston 2, and packing ring 5 and bar 3 are formed whole, and spring 4 is between the shoulder 21 of a packing ring 5 and Venturi tube 1 part.In a single day spring 4 is packed into and just is compressed so that add power F on piston 2, and this tries hard to keep and holds this piston and be pressed onto on the shoulder 21;
Can provide system 18 to detect the motion of piston if desired.This system can be machinery as lever, electric as contact, switch, hydraulic pressure as divider, pneumatic, magnetic, electronics or any other type;
The communication chamber that comprises conduit 13 is in Wen's body, if this body is made of solid member, then conduit 13 with the in fact vertical mode opening of fluid flow direction in the fluid passage, the cross section of opening part fluid passage is greater than the cross section of SC section, and parallel with piston.Conduit 13 is with " back " face 23 to piston 2 of fluid Hydrostatic Transfer Device on the cross section 16.As general standard, the fluid that acts on 23 in the piston can be the same with the fluid by Venturi tube.But, wish to use different fluids for the permanance and the reliability of installing.
One embodiment of the invention are considered this point, will describe with reference to the figure of figure 6 and back.
When fluid passed through Venturi tube 1, the static pressure on the Venturi tube different cross section was different value.Can calculate pressure differential between two section S 1 and the S2 according to the following Bernoulli's theorem that is applied to incompressible fluid:
Ps
1+1/2RV
2s
1+RgZs
1＝Ps
2+1/2RV
2s
2+RgZs
2+DH
12（Ⅰ）
Ps in the formula
1And Ps
2Be respectively the static pressure on section S 1 and the S2,
Vs
1And Vs
2Be respectively the flow rate value that section S 1 and S2 go up flow rate of fluid,
Zs
1And Zs
2Be respectively the height change value of section S 1 and S2 relative fixed reference frame,
R is the volume mass of fluid,
G is an acceleration of gravity,
DH
12Be that the pressure of fluid between section S 1 and S2 falls.
In order to simplify also in order to make description clearer, we can think Rg(Zs
1-Zs
2) item compares 1/2R(V
2s
1-V
2s
2) little, DH
12Item is than (Ps
1-Ps
2) little.
If conduit 13 leaves in the cross section of Venturi tube narrow upstream, make opening point produce very little pressure and fall, above-mentioned comparison will prove in more detail.
Bernoulli equation (I) becomes so
Ps
2-Ps
1＝1/2R（V
2s
1-V
2s
2） （Ⅱ）
If Q is the volume flow rate of fluid, equation (II) can be write as
Ps
2-Ps
1＝1/2R（ 1/(S
2 1) － 1/(S
2 2) ）Q
2（Ⅲ）
To given device, S1 and S2 are constants.The equation III can be write as
Ps
2-Ps
1＝ARQ
2（Ⅳ）
A=1/2(1/ (S in the formula
2 1)-1/ (S
2 2)) be constant.
Clearly visible from the equation IV to given fluid and fixing volume mass, pressure differential Ps
2-Ps
1Only as flow rate Q square function and change.
When flow velocity reaches certain value, be called and excite flow rate Q
ActValue is added in the pressure differential DP=Ps on piston 2 section S
2-Ps
1, the f=DP * S that produces power enough overcomes the friction force that restoring force F adds that sealing system 12 produces.
At that constantly, the piston chamber that piston will leave it reaches new balance up to each power, promptly or be that restoring force increases, or is that the braking action of machinery makes moving component (piston, bar, packing ring ...) be parked in certain position.
Fig. 2 shows this new balance.System 18 detects this information when piston moves, and on behalf of fluid volume quality R, it directly multiply by flow rate Q square amassing: RQ
2
The curve representation of Fig. 3 is for given fluid, and pressure differential DP is as the function of flow rate Q and change (R is a constant).When reaching, flow velocity excites flow rate Q
ActPressure differential DP equals the section S of restoring force F divided by piston 2 during value.Curve 36 shows the curve shape of well-known venturi system among Fig. 3.Precision was very high when Venturi tube was made the flow rate detection device.In fact because pressure differential DP as the function of flow rate square, changes significantly so the very little change of the latter produces pressure differential DP.For example flow rate changes 10% and will cause pressure differential DP near 20% variation, and flow rate changes 20% will produce pressure differential DP near 44% variation.
System of the present invention combines the soundness of the accuracy of venturi system and mechanical system, reliability and medium cost, is particularly suitable for work in rugged environment (as high temperature, high pressure).
The flow rate threshold of system of the present invention has very big adjustable extent, and piston is moved.In fact to given fluid, excite flow rate will depend on the cross section of fluid passage, piston opposite, depend on the cross section of conduit 13 terminal orifices 14 or outlet place passage, depend on the section S of piston and depend on restoring force F.
These three cross sections are data of making, when in a single day system builds up just immutable.Restoring force F is (for example changes spring or change its original pressure) that can align on the other hand, and this just gives system of the present invention and helps adapting to all-environment regulating measure.
System of the present invention can comprise the piston of several identical or different section S.Be to detect identical or different flow rate to determine the cross section of these pistons and the mechanical property of response agency.So just can detect the scope of flow rate.For example according to detecting flow rate Q
1Piston moved and detected flow rate Q
2Piston not moving, perhaps two pistons all move or all do not have to move and just can know that in the flow rate of given time by apparatus of the present invention be at threshold value Q
1And Q
2Between, still less than or greater than these threshold value flow rates.
The flow rate of system of the present invention being put into fluid keeps the pipeline of constant also to can be used as the volume mass detecting device.
Might regulate response agency so makes piston move in given volume mass R generation.
Precision was lower than the detection flow rate when system of the present invention was used for the volume mass detection, because pressure differential only is decided by A power of volume mass involution.
Fig. 4 shows that a kind of remodeling of system of the present invention comprises piston 2 is positioned at the cross section, fluid passage greater than forming pressure samples mouth 14 place sections that pressure affacts piston 2 back sides by conduit 13.
The effect of the motion of piston 2 and spring 4 will be just in time opposite with system shown in Figure 1 in this case.
The motion of detection system 18 sensing pistons 2 will still might be adopted.
Fig. 2 shows the position of piston 2, has left its piston chamber, the cross section of partial blockage fluid passage.As (or use remodeling as shown in Figure 4) in the head indentation piston chamber with piston, do not block the cross section that part is not blocked the fluid passage yet even piston might be mounted to.
But can the partial blockage fluid flowing passage advantage of system of the present invention just.
In fact, it can make be in this case the signal detector of flow rate threshold dector and can produce certain expulsive force come operating equipment for example the set of systems of piston synthesize a single subassembly.
In fact when this piston or piston 2 blocked the flow channel of fluid F 1 or channel 24, they produced pressure and fall DT between the Venturi tube upstream and downstream, and this decays corresponding to the gross energy that takes place in the fluid with the form performance of heat.
Consider that system of the present invention (Fig. 2) lays respectively at 2 B and the C of upstream and downstream, the result of energy attenuation produces pressure differential dP, and its approximate value can be calculated by following equation V:
dP＝1/2R（V
1-V
2）
2＝P
B-P
C（Ⅴ）
R is the volume mass of fluid in the formula,
V
1Be the flow velocity of fluid on the cross section 15 that gets clogged,
V
2Be the flow velocity that fluid is ordered at C,
P
BIt is the stagnation pressure of ordering at B
Pc is the stagnation pressure of ordering at C
If the cross section, fluid passage equates at B, C point place, can measure this pressure differential and with calculated value relatively.If the cross section, fluid passage is in B, C point place difference, then the measured value of pressure will be reflected at the pressure loss and the kinetic energy 1/2RV of B, the generation of C point-to-point transmission simultaneously
2Variation.
Curve 37 among Fig. 5 shows the variation of system of the present invention upstream pressure when piston 2 parts obstruction flows.
When flow rate remains on less than exciting flow rate Q
ActWhen district value, pressure is with the function of flow rate square.When reaching when exciting flow rate, piston 2 outwards moves and causes that the B point pressure increases suddenly, shown in the PB1-PB2 section of curve 37.To higher flow rate, the pressure of ordering at B is again as flow rate Q square function.
When piston 2 stretches out,, the unexpected variation of pressure P B1-PB2 realizes correct operation because of making apparatus of the present invention.This can check at a distance by pressure survey.
Remodeling as shown in Figure 6 extend into the overvoltage that is produced among the piston 2 upstream fluid F1 with this piston or several piston and promotes parts.In addition, because fluid F 1 is isolated with the fluid that is used for promoting above-mentioned parts, remodeling shown in Figure 6 can use the fluid F 1 of carrying impurity, and this puts and below will further explain.
System shown in Figure 6 does not comprise the detection system 18 relevant with the motion of piston, but does not have ruled it out.Shown in remodeling in, might regulate detected threshold value by the initial value that nut 6 and packing ring 7 regulated restoring force F, can turn this nut by opening 8.
Be full of fluid F 2(such as hydraulic oil) communication chamber 13 play a part fluid F 2 storage tanks.When stretching out, piston 2 operates machine or relevant parts with fluid F 2.Might use several separately independently communication chamber 13 go to handle different mechanisms.
Therefore communication chamber 13 is with relevant with the part of the fluid flowing passage 22 that is positioned at the Venturi tube upstream.With elastic membrane 10 fluid F 1 is isolated with F2, protect elastic membranes 10 to avoid the corrosive attack of fluid F 1 with the parts 9 of a metal or nonmetal making, perforate is to pass to F2 to pressure from fluid F 1 in the parts 9.
Parts 9 will prevent that also film 10 distortion from protruding into fluid flowing passage 22, and this will cause that unexpected passage hinders.Certain available miscellaneous part replaces film, particularly uses piston.
Can be equipped with a compensated chamber 11 in the loop of fluid F 2, fundamental purpose is a compensator fluid F2 expanded by heating, to avoid the change of the system operation that the undesirable increase of fluid F 2 pressure may cause.
Fig. 7 represent when the flow rate by Venturi tube 1 more than or equal to give accent excite flow rate the time improvement of the present invention system operation.Leave piston chamber at pressure differential effect lower piston 2, the partial blockage fluid flowing passage.The motion of piston requires from the chamber 13 fluid F 2 of transmitting certain volume V to by piston area 23 and bore hole 20 formed spaces or distinguish 15.
Because film 10 distortion can keep the cumulative volume of fluid F 2 constant, because transmitted the fluid F 1 of equal volume V, so this transmission is possible by parts 9.
In Fig. 6 and Fig. 7, fluid F 2 is used for promoting the auxiliary piston of pressing spring 26 25 of annular.
The operation of this system is as follows:
When rate of flow of fluid reaches when being known as the threshold flow rate that excites flow rate, the flow channel 24 of piston 2 partial blockage fluid F 1 produces pressure at B, C point-to-point transmission and falls, and the result will obtain the actual pressure differential between B, C: P
B-P
C＞0.
With the system dimension that marks among the figure, with pressure reduction P
B-P
CTake advantage of the power of the force rate spring 26 that the net sectional area SP of auxiliary piston 25 obtains big, the fluid F 2 of pressurized 13 flows out from the chamber so, promotes piston 25 and compression springs 26 by conduit 27.This is a situation shown in Figure 7.
As shown in Figure 7, promote the initial volume of the chamber 13 that the volume of piston 25 required fluid F 2 can account for by film 10 distortion or try to achieve by the equivalent volumes that parts 9 transmit by fluid F 1.It should be noted that if fluid F 1 and F2 are during with a kind of fluid, do not have film 10, parts 9 and compensated chamber 11 systems also can operate.
The motion compresses spring 26 of piston 25, certain energy of usefulness possibly after can thinking to put aside.
As shown in Figure 6, the flow rate by reducing fluid F 1 drops to when enough low piston 2 or piston 25 resets up to B place pressure, and initial position is got back to by system.Should illustrate, piston 2 and 25 reset can synchronously also can be asynchronous.
Make the energy attenuation factor make forming a whole and directly utilize the fluid of fluid F 1 in flow rate detection and the movable auxiliary piston, can imagine the application that under given flow rate, promotes the system of the present invention of piston as driven plunger.
Fig. 8 is the simple legend that shows this system, and parts 28 are represented movably auxiliary piston, and parts 29 are shells of system.The motion of spring 26 confined pistons 28.The available lip-type packing 30 of sealing between movable auxiliary piston and the shell 29.
The film 10 of certain device shown in Figure 8, the compensated chamber 11 of screen 9 and device can omit, and can not run off scope of the present invention.
Provide the operation of this embodiment below:
When flow velocity reaches when being called certain flow velocity that excites flow rate, piston 2 leaves piston chamber, produces pressure and falls the result and makes auxiliary piston 28 motion and compression springs 26.
Certainly in the embodiment shown in Figure 8, auxiliary piston promotes piston 2 in moving, and these are different with the embodiment situation shown in Fig. 6,7.
In the embodiment shown in Figure 8 in addition, the volume that film 10 distortion is arranged is only corresponding to by piston 2 and the volume that may be vacated by 19 motions of piston in the compensated chamber.
Fig. 9 represents to have a kind of possibility embodiment of several pistons " effect " in the system of the present invention of different flow rates.There have three pistons 38,39,40 to have same cross-sectional under our particular case to be long-pending, horizontally in having the fluid passage of same cross-sectional.Spring 41,42,43 link to each other with aforesaid each piston respectively, produce the restoring force that has nothing in common with each other on piston.Therefore they will be to the different flow rates that excites
Reaction.
The available C that is respectively
1, C
2, C
3The contact link to each other with each piston, make respective pistons when motion connect additional electronic circuit.
Let as assume that
Let as assume that the flow rate Q by system is
System will be by state variation shown in Figure 9 to state shown in Figure 10.Piston 38 moves, and the result opens contact C
1Because piston P
2And P
3Do not move, so contact C
2And C
3To be kept closed.The electronics or the electric wiring that connect therewith of expression not will consider this three data among the figure.
Comprise respectively and be in flow rate
Shi Fanying and respectively with contact C
1And C
2The system of two pistons 38,39 that link to each other can be used to starting and stops for example shaft bottom digital data recording system.In describing, remaining will suppose
Be easy to set up and work as C
1Control opening entry when opening and work as C
2Open the time control stop and end the circuit of record.Therefore be easy to the controlling recording cycle by regulating flow rate.
System of the present invention also can be applicable to as French Patent (FRP) 78/22.063,79/08.803, the control of the variable-angle coupling bend of 79/08.804,80/29.890,82/00.652 described directional drilling.
In fact, be used for the operation of the variable-angle coupling bend of directional drilling, need take information into account and set up instantaneous overvoltage so that mobile piston in the part of joint.
By the cooperation of contact and groove, the mobile rotation that causes the relative top, bottom of coupling bend of auxiliary piston is because the design of variable-angle coupling bend produces an angle between the two-part axle that the result of the sort of rotation mentions in the above.
The application of system of the present invention is not limited to the single situation of variable-angle coupling bend, but finds its advantage in a lot of the application, particularly can be applicable to be positioned at the ducted equipment that can't enter inspection, and is flowing incompressible fluid in the pipeline; Requirement is sent to information the occasion of this equipment; With occasion for the certain energy of needs of operating machine.
For example this can be used to control the interval that each arm of hole enlarger separates, and hole enlarger is used for enlarging the diameter of well in drilling well.Figure 11 represents that a kind of of system of the present invention may use, and removes the arm 32 of well hole enlarger.When flow rate is higher than when exciting flow rate partly block fluid flow passage of piston 2, between B point and C point, produce enough big pressure reduction DP mobile piston 31, it links to each other with the arm 32 of hole enlarger by bar 44, so the arm 32 that makes hole enlarger spools 33 rotates relatively.
The result of this motion makes cutter wheel 34 leave borehole axis 35, and the result of this device rotation makes the well enlarged-diameter.In this configuration, as long as flow rate is kept suitable high value, the arm of hole enlarger just remains on the original position always.Can in this device, introduce piston 31 or the machinery of arm 32 positions or the latch mechanism of hydraulic pressure.Thereby might utilize flow rate detection of the present invention system to control reversing of this latch mechanism, this system responses be higher than initially excite flow rate flow rate to control removing of each arm.Conduit 45 and film 46 can transmit and accumulate by piston 31 and move and the fluid that arranges.
Claims (11)
1, a kind of device of test fluid flow rate comprises the body that constitutes described fluid passage, and this passage contains the xsect of two different values at least; This device comprises a piston at least, it is characterized in that this piston has two faces to cooperate with the piston chamber of contiguous this passage; This piston and this piston chamber limit two districts, lay respectively at the outside of two faces of piston; This device also comprises makes this piston get back to the response agency of the primary importance in the piston chamber, and this response agency extends in this passage this piston and plays opposing; In fact the pressure in above-mentioned each district equate with pressure on corresponding one of them xsect in the passage; Fluid stream in described piston and the described passage directly contacts; This piston has a sufficiently long stroke, blocks the flow channel of fluid when it moves at least in part.
2, device as claimed in claim 1, the passage that it is characterized in that it has the shape of Venturi tube, and it comprises then expansion section of a narrow in other words, and one of them above-mentioned district is communicated on the minimum xsect.
3, device as claimed in claim 1, the piston chamber that it is characterized in that piston is a cylindrical shape, in fact to flow through the direction of passage vertical with fluid for the axle of piston chamber.
4, device as claimed in claim 1 is characterized in that it comprises several pistons, and each piston all has its suitable response agency.
5, device as claimed in claim 1 one of is characterized in that in an above-mentioned at least district and two cross sections being communicated with by movable or deformable wall.
6, device as claimed in claim 1 is characterized in that this device contains the system that detects above-mentioned piston motion.
7, as any described device in the claim 1 to 6, it is characterized in that this device comprises an auxiliary piston, these two districts of auxiliary piston regulation, there is identical pressure in one of them district with an interior cross section of this passage.
8, device as claimed in claim 7 is characterized in that this piston has sufficiently long stroke, thereby the increase of this piston its motion causing pressure can make auxiliary piston move.
9, device as claimed in claim 7 is characterized in that this auxiliary piston is supporting passage and this piston.
10, device as claimed in claim 7, it is characterized in that this device comprises a conduit, this conduit is one of them district's connection of one of them district of auxiliary piston regulation and above-mentioned piston regulation, with another root conduit make these two districts in fact with passage in be positioned at described piston upstream by flow direction an xsect have identical pressure.
11, a kind of method that is used at least one threshold value flow rate of test fluid and is used to control the action that produces by this flow rate, it is characterized in that making this fluid to rise to flow through and have the passage of two varying cross-sections at least by the threshold value flow rate, this passage to small part gets clogged, fall so that make fluid produce pressure, the pressure differential that can be applicable to this baffle both sides existence is controlled an action.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86105519 CN1013306B (en) | 1986-07-28 | 1986-07-28 | Method and device for detecting fluid flow rate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86105519 CN1013306B (en) | 1986-07-28 | 1986-07-28 | Method and device for detecting fluid flow rate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN86105519A CN86105519A (en) | 1988-02-10 |
| CN1013306B true CN1013306B (en) | 1991-07-24 |
Family
ID=4802869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86105519 Expired CN1013306B (en) | 1986-07-28 | 1986-07-28 | Method and device for detecting fluid flow rate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1013306B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10053919B2 (en) | 2013-07-30 | 2018-08-21 | Schlumberger Technology Corporation | Moveable element to create pressure signals in a fluidic modulator |
| CN114487390B (en) * | 2022-01-29 | 2023-03-17 | 美昕医疗器械(昆山)有限公司 | Detection box and detection system for detecting liquid flow in medical diversion device |
-
1986
- 1986-07-28 CN CN 86105519 patent/CN1013306B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN86105519A (en) | 1988-02-10 |
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