CN206146477U - Improve device of flow measurement precision - Google Patents
Improve device of flow measurement precision Download PDFInfo
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- CN206146477U CN206146477U CN201620847801.6U CN201620847801U CN206146477U CN 206146477 U CN206146477 U CN 206146477U CN 201620847801 U CN201620847801 U CN 201620847801U CN 206146477 U CN206146477 U CN 206146477U
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Abstract
The utility model relates to an improve device of flow measurement precision, including throttle mechanism and processing module, both ends are equipped with pressure differential upper reaches thief hatch and pressure differential low reaches thief hatch respectively around the orifice that is equipped with in the runner of ventilating, and pressure differential upper reaches sampling pipe is connected with pressure differential upper reaches thief hatch makes its and the runner upper reaches intercommunication of ventilating, and pressure differential low reaches sampling pipe and pressure differential low reaches thief hatch are connected to make it and ventilate the runner low reaches and are communicate, and processing module includes sample module, treater and memory, and the module of sampling includes the differential pressure sensor of different ranges more than two or two. Use segmentation measuring method, little flow range uses journey differential pressure sensor measurement in a small amount, and big flow range uses wide range differential pressure sensor to measure, realizes the high precision measurement of whole flow section, has extended the measuring range of flow. Use throttle mechanism and a plurality of differential pressure sensor's method, solve the contradiction of pressing between differential current level sensor precision and the range, realize wide range high accuracy flow measurement.
Description
Technical field
This utility model is related to respirator and anesthetic machine field, specifically a kind of device for improving flow measurement precision.
Background technology
In respirator and anesthetic machine application, expiratory flow sensor is indispensable ingredient.In order to avoid disease
The cross infection in the human world, at present conventional expiratory flow sensor is disposable elements, or the reuse element that can sterilize.
Disposable expiratory flow sensor, makes the use cost of respirator higher.Reusable expiratory flow sensor can be sterilized can
So that cost is substantially reduced.Differential flow transducer does not have electrical equipment because of throttle mechanism so as to which sterilization becomes simple, in addition
Its cost is relatively low, therefore differential pressure flow sensor is used widely in respirator, anesthetic machine.What is commonly used in the industry is single
The differential pressure flow sensor of differential pressure pickup, due to the flow-pressure differential characteristic of differential pressure flow sensor, current differential pressure flow
Transducer range cannot be balanced well with precision.
Current differential pressure flow sensor is the differential pressure flow sensor using single differential pressure pickup, point constant aperture
With two kinds of aperture of change.Constant aperture uses the differential pressure flow sensor of single differential pressure pickup, aperture to fix, only using a pressure
Gap sensor measures pressure reduction, and the measurement for realizing flow is demarcated by flow-pressure differential.Become pressure of the aperture using single differential pressure pickup
Difference flow transducer, in flow transducer runner shell fragment is increased, different according to flow velocity, and shell fragment aperture changes therewith.Flow-
Differential pressure curve compensation is approximately linear, by calibrational capacity-pressure reduction, realizes flow measurement.Constant aperture flow transducer pressure reduction P
It is as shown in Figure 3 with the relation curve of flow Q.It can be seen that pressure reduction is secondary relation with flow.Therefore it is less in flow
When, small pressure reduction change is with regard to the larger changes in flow rate of correspondence.Therefore the precision for improving low discharge is wanted, it is necessary to high-precision
Differential pressure pickup.When flow is larger, the very big less changes in flow rate of pressure reduction change correspondence, therefore to obtain big flow amount
Journey, must just use the differential pressure pickup of larger range.However, the precision and range of differential pressure pickup are conflict amounts.Essence
Degree is high, then range is little；Range is big, then precision is low.For respirator, anesthetic machine, it is required in gamut scope higher
Precision, and the scope of respirator, anesthesia machine flow is also very big.Therefore constant aperture uses the pressure reduction of single differential pressure pickup
Flow transducer is difficult to meet and requires.
And for aperture differential pressure flow sensor is become, by reed, flow and the relation of pressure reduction can be corrected into approximate
Linear relationship, as shown in Figure 4.The flow transducer of this structure has relaxed to a certain extent the contradiction of precision and range, but
Can not be corrected using reed and be affected for completely linear relationship, therefore certainty of measurement.In addition the concordance of reed is more difficult
Control, long-time stability and reliability are relatively low.
The content of the invention
The purpose of this utility model is for the problems referred to above and deficiency, there is provided a kind of pressure reduction by multiple different ranges
Sensor, realizes wide range, the device of high-precision differential pressure flow sensor.
What the technical solution of the utility model was realized in：
A kind of device for improving flow measurement precision, including throttle mechanism and processing module, the throttle mechanism includes logical
Flow channel and the throttle orifice being arranged in venting flow path, in throttle orifice rear and front end pressure reduction sampled upstream mouth and pressure reduction are respectively equipped with
Sampled downstream mouth, pressure reduction sampled upstream pipe is connected with pressure reduction sampled upstream mouth makes it connect with venting flow path upstream, pressure reduction downstream
Sampling tube is connected with pressure reduction sampled downstream mouth makes itself and venting flow path communicating downstream, and the processing module includes sampling module, place
Reason device and memorizer, sampling module includes the differential pressure pickup of two or more different ranges.
Further, sampling module includes small-range differential pressure pickup I and wide range differential pressure pickup II, differential pressure pickup
I and differential pressure pickup II is connected with pressure reduction sampled upstream pipe and pressure reduction sampled downstream pipe, measures venting flow path upstream and downstream two ends
Pressure reduction.
Further, throttle orifice is constant aperture throttle orifice.Throttle orifice can also be variable orifice footpath throttle orifice.
Further, the method that flow measurement precision is improved using said apparatus, is comprised the steps of：
Step one, toward the ascending through-current capacity of venting flow path, while sampling module is sampled, venting flow path is by not cocurrent flow
The pressure reduction at throttle orifice two ends during amount；
Step 2, is demarcated using processor to the flow in step one and its corresponding pressure reduction, and calibration coefficient is deposited
Storage is in memorizer；
Step 3, during measurement flow, the pressure reduction that processor is sampled using sampling module, by the demarcation for being stored in memorizer
Coefficient, calculates the flow for currently flowing through venting flow path.
Further, when the step 2 is demarcated to flow and pressure reduction, the model that the multiple differential pressure pickups of correspondence are covered
Enclose, the pressure reduction sampled using the differential pressure pickup of least effective dose (LED) journey is demarcated；
Further, when the step 3 uses pressure reduction calculated flow rate, if pressure reduction falls in multiple differential pressure pickup ranges
In the range of, calculate measurement flow using the differential pressure pickup institute differential manometer of least effective dose (LED) journey.
The method that this utility model flow transducer uses areal survey, low discharge section is surveyed using small-range differential pressure pickup
Amount, big flow scope is measured using wide range differential pressure pickup, realizes the high-acruracy survey of whole range of flow, while expanding
The measurement range of flow.Using the method for multiple differential pressure pickups, single differential pressure pickup flow transducer precision is solved with amount
Contradiction between journey, realizes large range high precision flow transducer.
This utility model is further described below in conjunction with the accompanying drawings.
Description of the drawings
Fig. 1 is many differential pressure pickup flow transducers of this utility model；
Fig. 2 is this utility model small-range, the constant aperture flow-pressure differential curve of wide range differential pressure pickup measurement；
Fig. 3 is constant aperture flow transducer flow-pressure differential curve；
Fig. 4 is variable orifice run-off sensor flow-differential pressure curve.
Specific embodiment
As shown in figure 1, this utility model is a kind of device of raising flow measurement precision, including throttle mechanism 1 and process
Module 13, the throttle mechanism 1 includes being provided with throttle orifice 5 in venting flow path 2, venting flow path 2, and throttle orifice 5 adopts constant aperture
Throttle orifice, be respectively equipped with pressure reduction sampled upstream mouth 3 and pressure reduction sampled downstream mouth 4 in the rear and front end of throttle orifice 5, pressure reduction upstream is adopted
Sample pipe 6 is connected with pressure reduction sampled upstream mouth 3 makes it connect with the upstream of venting flow path 2, and pressure reduction sampled downstream pipe 7 is adopted with pressure reduction downstream
The connection of sample mouth 4 makes itself and the communicating downstream of venting flow path 2, the processing module 13 include sampling module 8, processor 11 and memorizer
12, sampling module 8 includes the differential pressure pickup of two or more different ranges, and a kind of embodiment of this utility model is using little
The differential pressure pickup I9 of range and the differential pressure pickup II10 of wide range, differential pressure pickup I9 and differential pressure pickup II10 and pressure reduction
Sampled upstream pipe 6 and pressure reduction sampled downstream pipe 7 connect, and measure the pressure reduction at the upstream and downstream two ends of venting flow path 2.
The method that this utility model uses areal survey, using the differential pressure pickup of two or more different ranges,
In low discharge scope, using small-range differential pressure flow sensor, flow is calculated according to measured pressure reduction, because small-range pressure
Gap sensor has higher precision and resolution, thus while the pressure reduction change that the change of low discharge range flow is produced is less,
Can also accurate measurement.
In big flow scope, using wide range differential pressure pickup, flow is calculated according to measured pressure reduction.Although a large amount of
Journey differential pressure pickup is relatively low with respect to small-range delta pressure sensor accuracy and resolution, but is closed according to constant aperture flow-pressure differential
System, in big flow scope, the change of changes in flow rate corresponding pressure reduction can still obtain higher precision also than larger.
Before measurement, the corresponding throttle orifice two that first flow and differential pressure pickup through throttle mechanism venting flow path is measured
The pressure reduction at end is demarcated.With reference to Fig. 1, the ascending through-current capacity in the direction as shown in arrow in venting flow path 2, for example, from 0-
200L/min steps up flow, at the same time, the corresponding not cocurrent flow of big small-range differential pressure pickup sampling simultaneously of sampling module 8
The pressure reduction at the two ends of throttle orifice 5 during amount.For low discharge scope, using the pressure reduction measured by small-range differential pressure pickup I9 rower is entered
Fixed, big flow scope is demarcated using the pressure reduction measured by wide range differential pressure pickup II10.Such as Fig. 2, small-range pressure reduction biography
It is Q1 that the maximum of sensor I9 effectively measured value is P1 correspondence flows, and the maximum effectively measured value of wide range differential pressure pickup II10 is
P2, correspondence flow is Q2.Therefore in 0-Q1（0-P1）Scope is demarcated using small-range differential pressure pickup institute pressure measurement difference,
Q1-Q2 (P1-P2) scopes are demarcated using wide range differential pressure pickup institute pressure measurement difference.Processor 11 is respectively different range
Calibration coefficient is stored in memorizer 12, and the flow by venting flow path 2 is calculated according to pressure reduction during for measuring.
During measurement, when there is flow to pass through from venting flow path 2, pressure reduction can be produced at the two ends of throttle orifice 5, big small-range pressure reduction is passed
Sensor is sampled the pressure reduction simultaneously.Judge which scope pressure reduction falls in, if fallen in small-range differential pressure pickup I9 range abilities
It is interior（0-P1）, processor 11 is using the pressure reduction measured by small-range differential pressure flow sensor I9 by marking accordingly in memorizer 12
Determine coefficient and calculate flow by venting flow path 2, if fallen outside small-range differential pressure pickup I9 range abilities, but a large amount of
In journey differential pressure pickup II10 range abilities（P1-P2）, processor 11 is using measured by wide range differential pressure flow sensor II10
Pressure reduction flow by venting flow path 2 is calculated by corresponding calibration coefficient in memorizer 12.
This utility model another kind embodiment throttle orifice 5 can also adopt variable orifice footpath throttle orifice.
Above-described embodiment is this utility model preferably embodiment, but embodiment of the present utility model is not by above-mentioned
The restriction of embodiment, it is other it is any without departing from the change made under spirit of the present utility model and principle, modify, replace
Generation, combination, simplification, should be equivalent substitute mode, be included within protection domain of the present utility model.
Claims (4)
1. it is a kind of improve flow measurement precision device, it is characterised in that：Including throttle mechanism（1）And processing module（13）, institute
State throttle mechanism（1）Including venting flow path（2）And it is arranged on venting flow path（2）Interior throttle orifice（5）, in throttle orifice（5）In front and back
It is respectively arranged at two ends with pressure reduction sampled upstream mouth（3）With pressure reduction sampled downstream mouth（4）, pressure reduction sampled upstream pipe（6）With pressure reduction upstream
Thief hatch（3）Connection makes itself and venting flow path（2）Upstream connects, pressure reduction sampled downstream pipe（7）With pressure reduction sampled downstream mouth（4）Even
Connecing makes itself and venting flow path（2）Communicating downstream, the processing module（13）Including sampling module（8）, processor（11）And storage
Device（12）, sampling module（8）Including the differential pressure pickup of two or more different ranges.
2. device as claimed in claim 1, it is characterised in that：Sampling module（8）Including the differential pressure pickup I of small-range（9）
With the differential pressure pickup II of wide range（10）, differential pressure pickup I（9）With differential pressure pickup II（10）With pressure reduction sampled upstream pipe
（6）With pressure reduction sampled downstream pipe（7）Connection, measures venting flow path（2）The pressure reduction at upstream and downstream two ends.
3. device as claimed in claim 1 or 2, it is characterised in that：The throttle orifice（5）It is constant aperture throttle orifice.
4. device as claimed in claim 1 or 2, it is characterised in that：The throttle orifice（5）It is variable orifice footpath throttle orifice.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620847801.6U CN206146477U (en) | 2016-08-08 | 2016-08-08 | Improve device of flow measurement precision |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620847801.6U CN206146477U (en) | 2016-08-08 | 2016-08-08 | Improve device of flow measurement precision |
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| Publication Number | Publication Date |
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| CN206146477U true CN206146477U (en) | 2017-05-03 |
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| CN201620847801.6U Active CN206146477U (en) | 2016-08-08 | 2016-08-08 | Improve device of flow measurement precision |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106248159A (en) * | 2016-08-08 | 2016-12-21 | 广州七喜医疗设备有限公司 | A kind of device and method improving flow measurement precision |
| CN109939314A (en) * | 2017-12-20 | 2019-06-28 | 北京谊安医疗系统股份有限公司 | A kind of altitude compensation method of the differential flow sensor of ventilator |
-
2016
- 2016-08-08 CN CN201620847801.6U patent/CN206146477U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106248159A (en) * | 2016-08-08 | 2016-12-21 | 广州七喜医疗设备有限公司 | A kind of device and method improving flow measurement precision |
| CN109939314A (en) * | 2017-12-20 | 2019-06-28 | 北京谊安医疗系统股份有限公司 | A kind of altitude compensation method of the differential flow sensor of ventilator |
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