CN100547360C - Restriction device and have the flow quantity detecting system of this restriction device - Google Patents
Restriction device and have the flow quantity detecting system of this restriction device Download PDFInfo
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- CN100547360C CN100547360C CNB2006100619623A CN200610061962A CN100547360C CN 100547360 C CN100547360 C CN 100547360C CN B2006100619623 A CNB2006100619623 A CN B2006100619623A CN 200610061962 A CN200610061962 A CN 200610061962A CN 100547360 C CN100547360 C CN 100547360C
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Abstract
The invention discloses a kind of restriction device, it comprises the diplopore seat and the apertured dividing plate that distributes, this diplopore seat comprise engage first, two hole seats, first, two hole seats have first respectively, two cavitys, dividing plate be located at this first, the joint of two hole seats, first, the position of the contiguous dividing plate of two hole seats is respectively equipped with first, two thieff hatchs, first cavity comprises first liquid flow cavity and first liquid flow hole, the aperture of this first liquid flow hole is less than the internal diameter of first liquid flow cavity, this second cavity comprises second liquid flow cavity and second liquid flow hole, the aperture of this second liquid flow hole is less than the internal diameter of second liquid flow cavity, dividing plate be positioned at this first, between second liquid flow hole, first, second thieff hatch is respectively with first, second liquid flow cavity connects.Owing to be to adopt the throttle type measuring principle, so simple in structure and cost is lower; Because the setting of dividing plate, when the low discharge fluid has the dividing plate in slit by this, can play the effect that increases pressure reduction, thereby measurement resolution and precision have been improved to low discharge.
Description
Technical field
The present invention relates to the restriction flowmeter field.
Background technology
In scientific research and commercial unit, often the use traffic meter is measured the flow of gas in the gas circuit, and principle, the method for flowmeter survey are numerous.In concrete Anesthesia machine product, need measure the flow of live gas, enter the loop with the management live gas.Live gas commonly used comprises oxygen, laughing gas, air.What present most of Anesthesia machine adopted is glass tube spinner-type flowmeter and electronic flow-meter two big classes.What the glass tube spinner-type flowmeter adopted is the principle of interchangeable rotor flowmeter, realizes that technical difficulty is low, uses extensively, by many Anesthesia machines are used, shows and the bigger shortcoming of volume but exist reading to be difficult for numeral.Electronic flow-meter mainly contains several big classes such as mass flowmeter (also claiming thermal flowmeter), ultrasonic flowmeter, turbo flow meter, throttle type (fixedly orifice plate) flowmeter at present in the flow measurement technology field, what be used for the main use of fresh gas flow measurement on the Anesthesia machine on the market is mass flowmeter, its principle is to take away the temperature variation that heat causes by gas flow in the induction gas circuit to come calculated flow rate, its shortcoming is the cost height, and service wear is big.And restriction flowmeter is also quite extensive in the application in flow measurement technology field, and its advantage is that manufacturing is simple, cost is low; The minimum sensitivity of its shortcoming is big, differential pressure signal becomes with rate of flow of fluid that subduplicate relation, precision are not high, range ability is narrow and loss is little.
Summary of the invention
Technical matters to be solved by this invention is, overcomes the deficiencies in the prior art, provides a kind of cost low, simple in structure and restriction device and flow quantity detecting system have high-resolution and precision in low discharge is measured.
The technical solution adopted for the present invention to solve the technical problems is: this restriction device comprises the diplopore seat and the apertured dividing plate that distributes, this diplopore seat comprise engage first, two hole seats, first, two hole seats have respectively axially run through first, two cavitys, dividing plate be located at this first, the joint of two hole seats, first, the position of the contiguous dividing plate of two hole seats is respectively equipped with first, two thieff hatchs, first cavity comprises first liquid flow cavity and first liquid flow hole of coaxial communication, the aperture of this first liquid flow hole is less than the internal diameter of first liquid flow cavity, this second cavity comprises second liquid flow cavity and second liquid flow hole of coaxial communication, the aperture of this second liquid flow hole is less than the internal diameter of second liquid flow cavity, this dividing plate be positioned at this first, between second liquid flow hole, this is first years old, second thieff hatch is respectively with first, second liquid flow cavity connects.
The joint of described first, second hole seat is equipped with seal.
The described first hole seat comprises first pedestal and first orifice plate that connects one, this first liquid flow cavity axially runs through this first pedestal, this first liquid flow hole axially runs through this first orifice plate, this second hole seat comprises second pedestal and second orifice plate that connects one, this second liquid flow cavity axially runs through this second pedestal, and this second liquid flow hole axially runs through this second orifice plate.
Described dividing plate is made by micro particulate materials, and slit-shaped is formed between each microparticle.
Described first, second cavity is separately installed with first, second joint away from an end of dividing plate.
This flow quantity detecting system with restriction device comprises first, second force samples device, differential pressure pickup, signal amplification circuit, A/D change-over circuit, data processing unit and output unit, this first, second force samples device is installed in respectively in first, second thieff hatch, its data output end connects the input end of differential pressure pickup, and this differential pressure pickup, signal amplification circuit, A/D change-over circuit, data processing unit and output unit connect in turn.
Described differential pressure pickup provides constant-current driving by discharge circuit.
Described signal amplification circuit is three amplifier instrument amplifiers.
The invention has the beneficial effects as follows, owing to be to adopt the throttle type measuring principle, so simple in structure and cost is lower; Because the setting of dividing plate, when the low discharge fluid has the dividing plate in slit by this, can play the effect that increases pressure reduction, thereby measurement resolution and precision have been improved to low discharge.
Description of drawings
Fig. 1 is the stereographic map of restriction device of the present invention.
Fig. 2 is the main cut-open view of restriction device of the present invention.
Fig. 3 is the schematic block circuit diagram of flow quantity detecting system of the present invention.
Embodiment
See also Fig. 1 to Fig. 2, restriction device of the present invention be used for fluid by the time produce pressure reduction in upstream and downstream, it comprises diplopore seat 1 and dividing plate 2.This diplopore seat 1 is made up of first, second hole seat 3,4, and this first hole seat 3 is made up of first pedestal 36 and first orifice plate 37, and this first pedestal 36 and first orifice plate 37 can be formed in one, and also can connect one by securing member.This first pedestal 36 is provided with first liquid flow cavity 32 that axially runs through, this first orifice plate 37 is provided with first liquid flow hole 33 that axially runs through, one end of this first liquid flow cavity 32 is equipped with first joint 34, its other end then is communicated with first liquid flow hole 33, the aperture of this first liquid flow hole 33 and these first liquid flow cavity, 32 coaxial cables and this first liquid flow hole 33 is less than the internal diameter of first liquid flow cavity 32, and this first liquid flow cavity 32 and first liquid flow hole 33 constitute first cavity 31.This second hole seat 4 is made up of second pedestal 46 and second orifice plate 47, and this first pedestal 36 and first orifice plate 37 can be formed in one, and also can connect one by securing member.This second pedestal 46 is provided with second liquid flow cavity 42 that axially runs through, this second orifice plate 47 is provided with second liquid flow hole 43 that axially runs through, one end of this second liquid flow cavity 42 is equipped with second joint 44, its other end then is communicated with second liquid flow hole 43, the aperture of this second liquid flow hole 43 and these second liquid flow cavity, 42 coaxial cables and this second liquid flow hole 43 is less than the internal diameter of second liquid flow cavity 42, and this second liquid flow cavity 42 and second liquid flow hole 43 constitute second cavity 41.This first, second hole seat 3,4 engages by securing member, and first, second liquid flow hole 33,43 is adjacent.This dividing plate 2 is densely covered with the slit, it is installed in the joint of this first, second hole seat 3,4, thereby first, second cavity 31,41 is separated, first cavity 31 is communicated with second cavity 41 by the slit of this dividing plate 2, and all contiguous this dividing plate 2 of this first, second liquid flow hole 33,43 and branch are in this dividing plate 2 both sides.In addition, the outside wall surface of this first hole seat 3 is provided with first thieff hatch 35, this first thieff hatch 35 connects with this first liquid flow cavity 32, the outside wall surface of this second hole seat 4 is provided with second thieff hatch 45, this second thieff hatch 45 and second liquid flow cavity 42 connect, all contiguous this dividing plate 2 of this first, second thieff hatch, its be respectively applied for install be used for test fluid by the time upstream and downstream pressure signal first, second pressure signal sampling apparatus 5,6.In the present embodiment, this first, second hole seat all can be arranged side by side two or more cavitys that axially run through; The joint of this first, second hole seat 3,4 also is equipped with seal 13.
The pressure difference signal good reproducibility that this diplopore seat produces, pressure reduction changes greatly in high flow capacity, and is very favourable for the resolution of flow.This dividing plate is made by micro particulate materials, and this micro particulate materials generally adopts copper, aluminium, stainless steel, iron, glass, quartz and plastics etc., has the slit between the microparticle.For different fluids, can adopt different micro particulate materials, utilize the slit between the microparticle, when high flow capacity gas passes through, play the effect of steady air flow, reduction noise; At low discharge, when particularly 1L/min passed through with down-off, micro particulate materials can play the effect that increases pressure reduction more, thereby realized low discharge high resolving power and high-precision measurement.
See also Fig. 3, this flow quantity detecting system comprises restriction device and flow detection circuit, and this flow detection circuit comprises the first force samples device 5, the second force samples device 6, differential pressure pickup 7, signal amplification circuit 8, A/D change-over circuit 9, data processing unit 10 and output unit 11.The output terminal of this first, second force samples device is connected with two input ends of differential pressure pickup respectively, the output terminal of this differential pressure pickup is connected with the input end of signal amplification circuit, the output terminal of this signal amplification circuit is connected with the input end of A/D change-over circuit, the output terminal of this A/D change-over circuit is connected with the input end of data processing unit, and the output terminal of this data processing unit then is connected with output unit.The pressure signal of upstream and downstream that this first, second force samples device is used to obtain air communication when crossing restriction device, and this pressure signal is input to differential pressure pickup, this differential pressure pickup is converted to the voltage signal that can measure with the pressure reduction that the airflow passes restriction device is produced.Because the voltage signal of differential pressure pickup output is the millivolt level normally, so amplify by signal amplification circuit, voltage signal after this amplification is input to the A/D change-over circuit and is converted to digital signal, this digital signal is input to behind the data processing unit through mean filter and look-up routine, obtain gas flow corresponding under the current voltage, and can intuitively export by output unit.
The principle of this flow quantity detecting system is: utilize to be installed in restriction device to the corresponding this point of flow in the above-mentioned measurement distribution channel of the pressure difference signal of the generation of above-mentioned measured fluid and this measured fluid, by the flow detection circuit obtain with above-mentioned measurement distribution channel in the corresponding voltage output of the flow of above-mentioned measured fluid, utilize the meter of making in advance, export corresponding flow value by being scaled the voltage corresponding with above-mentioned flow.
In the present embodiment, differential pressure pickup 7 adopts the solid differential pressure pickup npc-1210-10wd3s of NOVA company, and it measures range is 0-25.4cmh
2O, exemplary voltages is linear output, and voltage range is 0-50mv, and precision can reach 0.5%, and it has compatible strong, the advantage such as dependable performance is durable and cost is lower of gas.
This differential pressure pickup 7 provides constant-current driving by preposition buffering discharge circuit 12, and according to the recommendation of NOVA company, the full scale of 1.5ma drive current correspondence is output as 25.4cmh
2O, 50mv in the practical application, can suitably reduce drive current, improves measurement range, to satisfy the needs of big flow measurement.
This signal amplification circuit can be three amplifier instrument amplifiers, this three amplifiers instrument amplifier is amplified to the signal that can make things convenient for data processing unit to gather with the millivolt level signal of differential pressure pickup output, the built-in adjustable resistance of solid differential pressure pickup npc-1210-10wd3s, recommendation circuit according to NOVA company, three amplifier instrument amplifier input stage circuits are output as 3.012v when full scale, gain is 3.012/0.05=60.24, and the output stage gain can be provided with according to the input range of A/D change-over circuit.Certainly, also can calculate the resistance of the built-in gain resistor of differential pressure pickup, adjust the gain amplifier of the input and output level of three amplifier instrument amplifiers according to actual conditions.
In order to satisfy the accuracy requirement of journey measurement in a small amount, satisfy the measurement range requirement of wide range simultaneously, one side needs to increase drive current in this Flow Measuring System, the signal to noise ratio (S/N ratio) when improving the measurement of a small amount of journey; Need to reduce drive current on the other hand again, improve the measurement range of differential pressure pickup, measurement range need be carried out staging treating, two ranges of---1L/min and 1---10L/min are realized to be divided into 0.05 at present.
The digital signal of A/D change-over circuit output is handled by data processing unit, and flow process such as comprise mean filter and table look-up draws pairing gas flow.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to the scope of patent protection that the present invention is determined by claims of being submitted to.
Claims (8)
1. restriction device, it is characterized in that: comprise the diplopore seat and the apertured dividing plate that distributes, this diplopore seat comprise engage first, two hole seats, first, two hole seats have respectively axially run through first, two cavitys, dividing plate be located at this first, the joint of two hole seats, first, the position of contiguous dividing plate is respectively equipped with first on the outside wall surface of two hole seats, two thieff hatchs, first cavity comprises first liquid flow cavity and first liquid flow hole of coaxial communication, the aperture of this first liquid flow hole is less than the internal diameter of first liquid flow cavity, this second cavity comprises second liquid flow cavity and second liquid flow hole of coaxial communication, the aperture of this second liquid flow hole is less than the internal diameter of second liquid flow cavity, this dividing plate be positioned at this first, between second liquid flow hole, this is first years old, second thieff hatch is respectively with first, second liquid flow cavity connects.
2. according to the described restriction device of claim 1, it is characterized in that: the joint of described first, second hole seat is equipped with seal.
3. according to the described restriction device of claim 1, it is characterized in that: the described first hole seat comprises first pedestal and first orifice plate that connects one, this first liquid flow cavity axially runs through this first pedestal, this first liquid flow hole axially runs through this first orifice plate, this second hole seat comprises second pedestal and second orifice plate that connects one, this second liquid flow cavity axially runs through this second pedestal, and this second liquid flow hole axially runs through this second orifice plate.
4. according to any described restriction device among the claim 1-3, it is characterized in that: described dividing plate is made by micro particulate materials, and slit-shaped is formed between each microparticle.
5. according to any described restriction device among the claim 1-3, it is characterized in that: described first, second cavity is separately installed with first, second joint away from an end of dividing plate.
6. flow quantity detecting system with the described restriction device of claim 1, it is characterized in that: it comprises first, second force samples device, differential pressure pickup, signal amplification circuit, A/D change-over circuit, data processing unit and output unit, this first, second force samples device is installed in respectively in first, second thieff hatch, its data output end connects the input end of differential pressure pickup, and this differential pressure pickup, signal amplification circuit, A/D change-over circuit, data processing unit and output unit connect in turn.
7. according to the described flow quantity detecting system of claim 6, it is characterized in that: described differential pressure pickup provides constant-current driving by discharge circuit.
8. according to the described flow quantity detecting system of claim 7, it is characterized in that: described signal amplification circuit is three amplifier instrument amplifiers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100619623A CN100547360C (en) | 2006-08-01 | 2006-08-01 | Restriction device and have the flow quantity detecting system of this restriction device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100619623A CN100547360C (en) | 2006-08-01 | 2006-08-01 | Restriction device and have the flow quantity detecting system of this restriction device |
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| Publication Number | Publication Date |
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| CN101118168A CN101118168A (en) | 2008-02-06 |
| CN100547360C true CN100547360C (en) | 2009-10-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006100619623A Active CN100547360C (en) | 2006-08-01 | 2006-08-01 | Restriction device and have the flow quantity detecting system of this restriction device |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102393224B (en) * | 2011-12-13 | 2014-07-02 | 衡阳中微科技开发有限公司 | Integrated intelligent flowmeter and measuring method |
| CN103070686B (en) * | 2012-12-25 | 2015-05-06 | 合肥博谐电子科技有限公司 | Device and method for measuring human body breathing mechanics parameter on basis of double differential-pressure sensors |
| CN104880570A (en) * | 2014-02-28 | 2015-09-02 | 北京谊安医疗***股份有限公司 | Flow velocity measuring apparatus and method used for inhalation end in respirator |
| CN104807516B (en) * | 2015-03-03 | 2018-09-28 | 中国寰球工程公司 | A kind of restriction orifice crossover flange measured for cryogenic media procedure parameter |
| CN110579251A (en) * | 2019-09-17 | 2019-12-17 | 浙江清环智慧科技有限公司 | Flow measuring method, device, system, electronic device and readable storage medium |
| CN111351532B (en) * | 2020-04-29 | 2022-03-18 | 南京润楠医疗电子研究院有限公司 | Bidirectional double-pressure-difference type respiratory flow detection sensing device and method |
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Application publication date: 20080206 Assignee: Shenzhen Mindray Animal Medical Technology Co.,Ltd. Assignor: SHENZHEN MINDRAY BIO-MEDICAL ELECTRONICS Co.,Ltd. Contract record no.: X2022440020009 Denomination of invention: Throttle device and flow detection system having the same Granted publication date: 20091007 License type: Common License Record date: 20220804 |
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