CN103292847A - Short-capillary flow sensor - Google Patents
Short-capillary flow sensor Download PDFInfo
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- CN103292847A CN103292847A CN201310026530.9A CN201310026530A CN103292847A CN 103292847 A CN103292847 A CN 103292847A CN 201310026530 A CN201310026530 A CN 201310026530A CN 103292847 A CN103292847 A CN 103292847A
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- pressure
- short
- flow sensor
- short capillary
- capillary
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- 239000012530 fluid Substances 0.000 claims abstract description 21
- 239000003507 refrigerant Substances 0.000 claims abstract description 5
- 230000004907 flux Effects 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- OBTWBSRJZRCYQV-UHFFFAOYSA-N sulfuryl difluoride Chemical compound FS(F)(=O)=O OBTWBSRJZRCYQV-UHFFFAOYSA-N 0.000 abstract description 16
- 238000000034 method Methods 0.000 abstract description 15
- 239000007788 liquid Substances 0.000 abstract description 14
- 238000002474 experimental method Methods 0.000 abstract description 5
- 239000005935 Sulfuryl fluoride Substances 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 4
- 238000003958 fumigation Methods 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 2
- 239000010959 steel Substances 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 abstract 2
- 239000002826 coolant Substances 0.000 abstract 1
- 239000002316 fumigant Substances 0.000 abstract 1
- 238000005057 refrigeration Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 238000005303 weighing Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- -1 sulfur acyl fluorides Chemical class 0.000 description 4
- 230000001954 sterilising effect Effects 0.000 description 3
- 238000004659 sterilization and disinfection Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000013341 scale-up Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention discloses a short-capillary flow sensor which is used for measuring the mass flow of a cooling medium fluid under the condition of high pressure. The short-capillary flow sensor comprises a short-capillary throttling device and pressure detection devices, wherein the short-capillary throttling device comprises a short-capillary inner pipe and a short-capillary outer pipe; and the pressure detection devices are positioned at two ends of the short-capillary throttling device and respectively used for measuring a high pressure P1 and a low pressure P2. The short-capillary flow sensor is a throttling or pressure-differential flow sensor, and the volume flow relates to the pressure difference; and the relation between the coefficient kappa of the mass flow and the pressure P1 when the pressure P1 changes is measured through an experimental method and then the mass flow can be measured. The short-capillary flow sensor is mainly used for controlling the quantity of fumigants in the fumigation process of containers, specifically, liquid sulfuryl fluoride in a high-pressure steel bottle is led out and meanwhile is measured and controlled, and then the sulfuryl fluoride, which is turned into a gas, is injected into a container. The short-capillary flow sensor also can be used for measuring and controlling the flow of a refrigerant in the refrigeration process.
Description
Technical field
The present invention relates to a kind of short capillary flow sensor, specifically a kind ofly make the measurement mechanism that restricting element is measured the mass rate of refrigerant fluid media (medium) with short capillary, belong to throttle type differential pressure formula flow measurement technology field.
Background technology
In the Inter-fumigation of Container Cargo sterilization operation, the liquid sulfur acyl fluorides in the high-pressure cylinder need be sent in the container by connecting tube method and quality in accordance with regulations.The liquid sulfur acyl fluorides that is in high pressure conditions is by transmission pipeline the time, and pressure reduces, volumetric expansion, temperature reduce, and under the condition that absorbs enough heats, can all become gas.According to the requirement of The State Administration for Entry-Exit Inspection and Quarantine, must carry out strictness control to dosage, its objective is to guarantee the requirement of killing and sterilize, reduce vikane gas again to the harm of the person and environment as far as possible, also to control the fumigation cost.
Material has three kinds of forms, and solid-state, liquid state and gaseous state along with the change of external condition, can transform mutually between three kinds of forms.For example under standard conditions, vikane is gaseous state, becomes liquid state when temperature is down to below-55.2 ℃, and temperature becomes solid-state when continuing to be down to below-136.7 ℃; When pressure changed within the specific limits, vikane can be changed between gaseous state and liquid state, and this moment, temperature also can change thereupon, can produce the exchange of heat, and this situation is identical with the physical phenomenon that the refrigerant medium takes place in process of refrigerastion.
Measuring fixed amount to vikane can adopt multiple scheme, and a kind of scheme is the Weighing method, and another kind of scheme is the mass flowmeter method.The Weighing method is that administration device is placed on the weighing device together with the vikane high-pressure cylinder, and the decrease of the vikane of weighing is tried to achieve dosage.Because administration device is the 30-40 kilogram together with vikane steel cylinder general assembly (TW), and each formulation rate is the 0.4-0.8 kilogram, and such weighing technique is difficult to guarantee enough measuring accuracy.If consider the influence that the shake of the administration device dewfall moisture absorption and pipeline causes again, make the Weighing method too greatly in fact infeasible because of error in the measuring fixed amount of vikane.Although in the sterilization of container sulfuryl fluoride fumigating synergistic, technology and the device relevant with the Weighing method occurred, also be not able to the measuring accuracy requirement of being accepted by market at present.
The flowmeter that adopts in the described mass flowmeter method can be selected mass-flow gas meter.Mass-flow gas meter generally adopts thermal type gas quality flow meter, though technology is comparatively ripe, the subject matter that exists is that the thermal type gas quality flow meter that is fit to measurement vikane gas does not exist.This thermal type gas quality flow meter development difficulty is big and cost is high, also will overcome the influence of quick variation fluid properties of the ultralow temperature and pressure of vikane gas.
Flowmeter related in the described mass flowmeter method also can adopt liquid mass flow meter.Thisly can directly measure the mass rate of vikane for the liquid sulfur acyl fluorides flowmeter under the condition of high voltage, measuring accuracy is higher, can also satisfy other requirements relevant with the sterilization of container sulfuryl fluoride fumigating synergistic, is a kind of reasonable vikane dosing method.
Summary of the invention
The present invention proposes a kind of short capillary flow sensor, be mainly used in the mass rate of the liquid sulfur acyl fluorides under the elevated pressures condition is measured, also can be used for the measurement of cold medium flux in the process of refrigerastion.
The measured medium of liquid quality flow sensor that the present invention proposes is the fluid that is liquefied because of elevated pressures, when hydrodynamic pressure reduces, also be accompanied by the reduction of temperature simultaneously, the part of the fluid that is liquefied is understood generating gasification, forms a kind of medium of gas-liquid coexisting state; If gas-liquid coexistence medium absorbs heat again, liquid state can all become gaseous state.
In order to measure the flow of described medium, the flow sensor that the present invention proposes comprises short capillary and two cover pressure-detecting devices, described short capillary comprises pipe and outer tube in the short capillary, and described two cover pressure-detecting devices are positioned at the two ends of short capillary, are respectively applied to measure inlet pressure P
1With top hole pressure P
2
Described pressure-detecting device comprises threeway and is installed in the pressure transducer of threeway vertical outlet.
According to the principle of work of hydromechanical theory and throttle type differential pressure formula flow sensor, in order to measure mass rate, at first want measurement volumes flow Q, multiply each other with the density p of fluid and volume flow Q again and try to achieve mass rate:
The flow sensor that the present invention relates to is a kind of throttle type differential pressure formula flow sensor, and what restricting element adopted is short capillary, it is characterized in that existing between the short capillary entrance and exit very big pressure differential:
Throttle type differential pressure formula flow sensor can be measured the volumetric flow rate of fluid, and the result of the size of described volumetric flow rate and pressure differential Δ P extraction of square root is proportional, and scale-up factor is called as the volumetric flow rate factor alpha; The volumetric flow rate factor alpha is relevant with the characteristic of shape capillaceous, length and diameter and fluid, can be determined by experiment; Volume flow Q, pressure differential
With the pass of volumetric flow rate factor alpha be:
With described volumetric flow rate
The described mass rate of substitution
, try to achieve mass rate and represent formula:
, wherein
, title κ is mass flow coefficient; Mass flow coefficient κ is also relevant with the characteristic of shape capillaceous, length and diameter and fluid, can be determined by experiment.
After short capillary was selected, its shape, length and diameter were definite fully, and at this moment the size of mass flow coefficient κ is only relevant with fluid behaviour, and the factor that under certain condition can fluid properties exerts an influence is inlet pressure P
1Mass flow coefficient κ is along with pressure P
1Variation relation be:
, κ wherein
0, β
0And β
1It is the constant determined of method by experiment.
Two pressure signal P with a kind of short capillary flow sensor acquisition of the present invention
1And P
2Deliver in the intelligent signal processing device, wherein pre-installed parameter κ
0, β
0And β
1, according to described formula:
With
, can try to achieve the mass rate of the fluid that flows into short capillary:
Description of drawings
Fig. 1 is external structure and the assembling synoptic diagram of a kind of short capillary flow sensor of the present invention; Fig. 2 is the internal structure synoptic diagram of a kind of short capillary flow sensor of the present invention.
Embodiment
The short capillary flow sensor that the present invention proposes is a kind of flow signal to be converted to the converting means of pressure signal, and Fig. 1 is external structure and the assembling synoptic diagram of present embodiment, and Fig. 2 is the internal structure synoptic diagram of present embodiment.
Described short capillary flow sensor is a kind of throttle type differential pressure formula flow sensor, and restricting element wherein is short capillary 1; Short capillary 1 is made up of pipe 8 and outer tube 9 in the short capillary; Pressure differential in the described throttle type differential pressure formula flow sensor in fact is that fluid is managed generation in 8 o'clock in flowing through short capillary, the effect of outer tube 9 be fixedly in the short capillary pipe 8 be connected with the front and back pipeline.
The flow that flows through pipe 8 in the short capillary also is the flow that flows through pipeline, and the size of flow is relevant with the pressure differential of pipe 8 front and back in the short capillary, and specifically the square root of flow and pressure differential is proportional, and scale-up factor can be determined by experiment.
Threeway 2 is respectively the pipe fitting that is connected short capillary 1 entrance and exit with threeway 3, and setting pressure sensor 4 and 5, two pressure transducers of pressure transducer are respectively applied to measure the inlet pressure P of short capillary 1 respectively at the vertical joint of threeway 2 and threeway 3
1With top hole pressure P
2
The external structure of Fig. 1 and assembling also comprise sealing gasket 6 between threeway 2 and the short capillary 1 and the sealing gasket 7 between threeway 3 and the short capillary 1 in the synoptic diagram.
Provide fluid intake 10 and the fluid egress point 11 of a kind of short capillary flow sensor of present embodiment in the internal structure synoptic diagram of Fig. 2, given the connectivity port 12 of pressure transducer 4 and the connectivity port 13 of pressure transducer 5.
Also marked the fluid of managing 8 two ends in a kind of short capillary flow sensor of present embodiment in the short capillary in the internal structure synoptic diagram of Fig. 2, inlet end fluid 14 and endpiece fluid 15; It should be noted that, though fluid is highly pressurised liquid but wherein may contains bubble that in order to make two pressure transducers energy operate as normal, the installation site of pressure transducer should be lower than fluid level, when being actual installation, connectivity port 12 and the connectivity port 13 of two threeways should be installed down.
Claims (7)
1. a short capillary flow sensor comprises short capillary restriction device and pressure-detecting device, and described short capillary restriction device comprises pipe and outer tube in the short capillary; Described pressure-detecting device comprises threeway and is installed in pressure transducer on the vertical joint of threeway, and two cover pressure-detecting devices are respectively applied to measure the inlet pressure P of short capillary
1With top hole pressure P
2
2. a kind of short capillary flow sensor according to claim 1 is characterized in that pipe is the kapillary of taper shape closing in the described short capillary, and described outer tube is for managing in fixing and being connected for pipeline.
3. a kind of short capillary flow sensor according to claim 2 is characterized in that the entrance and exit of pipe in the described short capillary is symmetrical structure.
4. a kind of short capillary flow sensor according to claim 2, the outer tube that it is characterized in that described short capillary comprise with the connected mode of described threeway be threaded, cutting ferrule is connected and be welded to connect.
5. a kind of short capillary flow sensor according to claim 1 is characterized in that described pressure transducer and the connected mode of described threeway comprise that external thread is connected with internal thread and be connected.
6. a kind of short capillary flow sensor according to claim 1, what it is characterized in that described pressure transducer adopts is refrigerant or refrigerant pressure sensor.
7. according to the described a kind of short capillary flow sensor of claim 1-6, the input signal that it is characterized in that described flow sensor is the flow of fluid media (medium), and output signal is two pressure signals relevant with measured flux; If require the delivery rate signal, also to dispose corresponding signal processing apparatus.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310026530.9A CN103292847A (en) | 2013-01-24 | 2013-01-24 | Short-capillary flow sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310026530.9A CN103292847A (en) | 2013-01-24 | 2013-01-24 | Short-capillary flow sensor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104121951A (en) * | 2014-08-11 | 2014-10-29 | 深圳国技仪器有限公司 | Multifunctional air resistance piece |
| CN107036666A (en) * | 2017-06-03 | 2017-08-11 | 华北水利水电大学 | A kind of target formula large diameter pipeline amount water installations and its water gaging method |
| CN108562338A (en) * | 2018-03-30 | 2018-09-21 | 川田机械制造(上海)有限公司 | Die heater flow quantity detecting system and its flow rate testing methods |
| CN109655115A (en) * | 2018-12-26 | 2019-04-19 | 北京安和博控科技有限公司 | A kind of porous transformation flow testing device |
| CN115575566A (en) * | 2022-08-04 | 2023-01-06 | 华北电力大学 | Nitrogen oxide measuring system and mass flow controller |
-
2013
- 2013-01-24 CN CN201310026530.9A patent/CN103292847A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104121951A (en) * | 2014-08-11 | 2014-10-29 | 深圳国技仪器有限公司 | Multifunctional air resistance piece |
| CN107036666A (en) * | 2017-06-03 | 2017-08-11 | 华北水利水电大学 | A kind of target formula large diameter pipeline amount water installations and its water gaging method |
| CN107036666B (en) * | 2017-06-03 | 2023-10-27 | 华北水利水电大学 | Target type large-caliber pipeline water measuring device and water measuring method thereof |
| CN108562338A (en) * | 2018-03-30 | 2018-09-21 | 川田机械制造(上海)有限公司 | Die heater flow quantity detecting system and its flow rate testing methods |
| CN109655115A (en) * | 2018-12-26 | 2019-04-19 | 北京安和博控科技有限公司 | A kind of porous transformation flow testing device |
| CN109655115B (en) * | 2018-12-26 | 2020-11-17 | 北京安和博控科技有限公司 | Porous transformation flow testing device |
| CN115575566A (en) * | 2022-08-04 | 2023-01-06 | 华北电力大学 | Nitrogen oxide measuring system and mass flow controller |
| CN115575566B (en) * | 2022-08-04 | 2023-10-27 | 华北电力大学 | Nitrogen oxide measuring system |
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Application publication date: 20130911 |