CN87101614A - " bridge " formula meter for flow resistance and flow - Google Patents
" bridge " formula meter for flow resistance and flow Download PDFInfo
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- CN87101614A CN87101614A CN 87101614 CN87101614A CN87101614A CN 87101614 A CN87101614 A CN 87101614A CN 87101614 CN87101614 CN 87101614 CN 87101614 A CN87101614 A CN 87101614A CN 87101614 A CN87101614 A CN 87101614A
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- bridge
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- flow resistance
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Abstract
" bridge " formula meter for flow resistance and flow is a kind of " bridge " formula constructional device that is used for fluid parameter metering, and it is in view of existing the on the low side and metering speed of measuring accuracy this class problem and proposing partially slowly in the prior art.It is by having adopted the structure similar with having high-resolution precision function " bridge " formula impedance circuit principle and again to realize as its technique guarantee such as the electronic digital displayer of high-precision force dependent sensor control.It is particularly useful for the flow resistance situation and the air capacity of compressor under different working condition pressures of fast detecting throttling valve, the high flow resistance type of kapillary one class apparatus, element.
Description
The present invention is a kind of " bridge " formula constructional device that is used for the fluid parameter metering.
At present, the method for metering pipeline flow resistance situation is: under level pressure, represent the flow resistance situation of this pipeline with the volume data (flow) that passes through certain gas of tested pipeline or liquid that measures in the unit interval.The flow of-gas or liquid is by naked eyes gas meter directly perceived or liquid measuring cup.Embodiment can see capillary flow amount determining device under the 230th page of Fig. 9-29 of " refrigerator and small-sized refrigerator " (86 years versions) that Dan Dake writes and the level pressure power shown in Fig. 9-30 for details.People can adopt the liquid meter method shown in above-mentioned Fig. 9-30 usually mostly, and do not adopt the easier gas dosing method shown in above-mentioned Fig. 9-29.What is more, for example when metering compressor air-discharging amount, people often do not adopt gas meter directly to measure, but managed to design the air capacity that the overall approach that allows liquid also participate in is into measured compressor, embodiment also can see the 111st page of Fig. 5-7 in the above-mentioned book that Dan Dake writes for details.Obviously cause the main cause of above-mentioned situation to be: the metering method of liquid with the naked eye directly perceived, its precision is higher than observation gas.And the main weakness of liquid processes is: by naked eyes intuitively measuring accuracy be difficult to the degree that reaches higher, and the metering formality is more numerous, and metering speed is slower, so it is suitable for the laboratory employing, be not suitable on producing, parts in enormous quantities being detected one by one, get with the house that determines them.
The objective of the invention is:, provide a kind of and the similar fluid parameter gauge of " bridge " formula circuit principle structure type in view of above-mentioned deficiency.
The present invention is achieved in that its damper (R by at least two conducts " brachium pontis " of the data presentation system that is associated with force sensing element control
2) and (R
3) formed " bridge " formula fluid parameter measurement structure that is similar to " bridge " formula impedance metering circuit.Should " bridge " formula structure can form " full-bridge " formula structure, also can form " half-bridge " formula structure by two dampers as " brachium pontis " by four dampers as " brachium pontis ".In " full-bridge " formula structure, force sensing element is coupled on two " half-bridges " middle, and in " half-bridge " formula structure, force sensing element is coupled to the two ends of any one damper.Force sensing element can be a force-sensing sensor, also can be tensimeter.This damper can be the damping pipeline, also can be throttling valve.
Compared with the prior art: because the present invention has adopted " bridge " formula impedance circuit theory structure with high-resolution precision function, simultaneously again to be used as its technique guarantee such as the high-precision force dependent sensor,-present sensing the pressure of having heard the force-sensing sensor of generation can reach the milligram level, near Gamma Magnitude.This has just created condition above prior art significantly for its measuring accuracy; Because the form that the present invention can make with the gaseous tension difference shows relevant fluid parameter, this has just created condition above prior art significantly for its metering speed.
Fig. 1 is " bridge " of the present invention formula structural principle synoptic diagram, as the damper (R of " brachium pontis "
1), damper (R
2), variable damper (R
3) and damping pipeline (R to be measured
4), " brachium pontis " connection point (a), (b), (c) and (d), force-sensing sensor (H), electronic digital displayer (Z), compressor (K), " full-bridge " formula structure (I), " half-bridge " formula structure (II).Connection point (a) is the gases at high pressure input ends, and connection point (d) is the low-pressure gas outlet end.The electronic digital displayer of being controlled by force-sensing sensor (H) and it (Z) shows the air pressure balance degree between (b) and (c) at 2 with numeral in " full-bridge " formula structure (I), when (b) is the same with (c) two point pressures, the reading of electronic digital displayer (Z) is zero, if the flow resistance situation: (R
1)=(R
2), (R then
4)=(R
3).The electronic digital displayer of controlling by force-sensing sensor (H) and it (Z) in " half-bridge " formula structure (II), show with numeral between (a) and (c) 2 by damper (R
2) difference that the atmospheric pressure that causes falls, the difference that this pressure falls is proportional to the air capacity of compressor (K).
Embodiments of the invention are with " full-bridge " formula structure (I) and " half-bridge " formula structure (II) " bridge " formula flow resistance flow instrument that is integrated in one.
Fig. 2 is the enforcement synoptic diagram of this instrument type.Damper (R as " brachium pontis "
1), damper (R
2), variable damper (R
3) and damping pipeline (R to be measured
4), " brachium pontis " connection point (a), (b), (c) and (d), force-sensing sensor (H), electronic digital displayer (Z), articulation (1), stop valve (2) is positioned at the tensimeter (3) that (b) puts, gas transmission stop valve (4), gas input adapter (5), reduction valve (6) is positioned at the tensimeter (7) that (a) puts, as main part of the present invention is exactly the part (8) of getting up with the double dot dash line frame, is positioned at the tensimeter (9) of (c) point.
When desire is measured certain damping pipeline (R
4) the flow resistance situation time, get: (R
1)=(R
2), gas input adapter (5) and nitrogen cylinder are linked, open stop valve (2) and (4), allow nitrogen pass through to be discharged in the atmosphere again behind this " bridge " formula structure pipeline and go, adjusting reduction valve (6), the stable reading that makes tensimeter (7) demonstration is at 10kg/cm
2, regulate variable damper (R at last
3), till the reading of electronic digital displayer (Z) is 0.00, record (R this moment
4)=(R
3), this explanation: (R
4) and (R
3) fluid flow that flows through them under level pressure equates, because (R
3) known, (R so
4) also just known.
When desire is measured the air capacity of certain compressor (K), the exhausr port of gas input adapter (5) with compressor (K) linked, close stop valve (2), open stop valve (4), start compressor (K) again, the gas approach damper (R that compressor this moment (K) is discharged
2) and variable damper (R
3), at this moment, the connection of force-sensing sensor (H) in this " bridge " formula structure is equivalent to " half-bridge " formula structure (II) fully, and the reading that digital indicator (Z) shows just in time is damper (R
2) difference that the atmospheric pressure of two ends (a) and (c) falls, (this gauge pressure can be by variable damper (R to see tensimeter (7) again
3) regulate), just can know whether the air capacity of compressor (K) under a certain discharge pressure reaches specified standard.It can be that direct pressure data shows that difference falls in-this pressure, and also can be has other numeral (comprising direct air capacity numeral) of corresponding relation to show with pressure data.
Claims (4)
1, a kind of " bridge " formula meter for flow resistance and flow has the data presentation system by force sensing element control, it is characterized in that: by the damper [R of at least two conducts " brachium pontis " that are associated with above-mentioned force sensing element control data display system
2] and [R
3] formed " bridge " formula fluid parameter measurement structure that is similar to " bridge " formula impedance metering circuit.
2, according to claim 1 described a kind of " bridge " formula meter for flow resistance and flow, it is characterized in that: described " bridge " formula fluid parameter measurement structure, can adopt: the damper (R by four conducts " brachium pontis " that is associated with above-mentioned force sensing element at 2 (b) and (c)
1), (R
2), (R
3) and (R
4) " full-bridge " formula structure (I) of forming, also can adopt: can also can be associated with the damper (R by two conducts " brachium pontis " of above-mentioned force sensing element (c) and (d) at 2 at (a) and (c) 2 points
2) and (R
3) composition " half-bridge " formula structure (II).
3, according to claim 1 and 2 described a kind of " bridge " formula meter for flow resistance and flow, it is characterized in that: described damper (R) can be the damping pipeline, also can be throttling valve.
4, according to claim 1 and 2 described a kind of " bridge " formula meter for flow resistance and flow, it is characterized in that: described " bridge " formula fluid parameter measurement structure, the force sensing element that it adopts can be force-sensing sensor (H), also can be tensimeter (3) and (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87101614 CN87101614A (en) | 1987-02-25 | 1987-02-25 | " bridge " formula meter for flow resistance and flow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87101614 CN87101614A (en) | 1987-02-25 | 1987-02-25 | " bridge " formula meter for flow resistance and flow |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN87101614A true CN87101614A (en) | 1987-08-19 |
Family
ID=4813553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87101614 Pending CN87101614A (en) | 1987-02-25 | 1987-02-25 | " bridge " formula meter for flow resistance and flow |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN87101614A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111272384A (en) * | 2020-02-21 | 2020-06-12 | 安徽皖仪科技股份有限公司 | Detection method and device for detecting flow resistance by pressure drop contrast |
-
1987
- 1987-02-25 CN CN 87101614 patent/CN87101614A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111272384A (en) * | 2020-02-21 | 2020-06-12 | 安徽皖仪科技股份有限公司 | Detection method and device for detecting flow resistance by pressure drop contrast |
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| PB01 | Publication | ||
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| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |