CN101311683A - Breathing machine and its low differential pressure type flow quantity detection mechanism - Google Patents
Breathing machine and its low differential pressure type flow quantity detection mechanism Download PDFInfo
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- CN101311683A CN101311683A CNA2007103083190A CN200710308319A CN101311683A CN 101311683 A CN101311683 A CN 101311683A CN A2007103083190 A CNA2007103083190 A CN A2007103083190A CN 200710308319 A CN200710308319 A CN 200710308319A CN 101311683 A CN101311683 A CN 101311683A
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Abstract
The invention relates to a low differential stress flow detection mechanism, comprising a main gas path (1), a throttling gear (3), a first sampling port (41), a second sampling port (42) and a metering device (6); wherein, the throttling gear (3) is arranged in the main gas path (1); the first sampling port (41) and the second sampling port (42) are positioned in the main gas path (1) and are respectively arranged at the front end and the back end of the throttling device (3); the gauging device (6) is connected with the first sampling port (41) and the second sampling port (42); the throttling gear (3) is provided with a plurality of concentric orifices (32) which are uniformly distributed around a central axis. The mechanism also relates to a ventilator which adopts the flow detection mechanism.
Description
Technical field
The present invention relates to a kind of low differential pressure type flow quantity detection mechanism, be used for medical breathing apparatus fields such as lung ventilator or Anesthesia machine, low pressure low discharge gas is carried out the flow measurement of high precision.The invention still further relates to a kind of lung ventilator that adopts this flow quantity detection mechanism.
Background technology
In the use of medicine equipments such as lung ventilator, Anesthesia machine, must carry out mechanical ventilation to the patient, for the patient who is receiving treatment, the control of the size of throughput is very important, particularly infant patient and Cavity in Critical Patients.Inappropriate throughput can bring danger to the patient on the contrary.Therefore the control of ventilation flow rate is very important, and this just must accurately measure the ventilation air-flow.
The mode of gasmetry has multiple, and the ultimate principle of the differential bypath system that the present invention uses is similar to the principle of plate hole flowmeter.
The plate hole flowmeter claims differential pressure flowmeter again, as shown in Figure 1, is made up of the restriction device 3 and the measuring apparatus 6 that produce part as pressure reduction, is widely used in the flow measurement of gas, steam and liquid.Its know-why: the fluid that the is full of pipeline restriction device in the pipeline of flowing through, near throttling element, cause local contraction, flow velocity increases, pressure reduces, it is poor that thereon, the both sides, downstream produce static pressure, segment fluid flow in the main channel is passed through from bypass, thereby the flow through flow detection that is installed in bypass or display instrument draw the fluid flow in the main channel.Common this orifice-plate flowmeter is used in gas piping more, petroleum pipe line, and places such as the big big latus rectum of flow such as feedwater piping are although this technology maturation is used extensively.Its significant disadvantages is: measuring accuracy is lower; Rangeability is narrow; The mounting condition height; Crushing is big; And be easy to generate turbulent flow 7 before and after the plate hole of plate hole differential flowmeter, and bigger to the measuring accuracy influence, do not meet the high-acruracy survey requirement of medical field.
The mass-flow gas meter that has some high-performance and low-costs in the market, it is fast that this class mass-flow gas meter has response speed, the measuring accuracy height, advantages such as volume is little, it adopts the principle of plate hole flowmeter bypass solution, but this mass-flow gas meter requires than higher restriction device and bypass.More little through sensor passage, by-pass factor at specified range down-sampling gas stream, the effect of sensor output is good more, for a very high by-pass factor, near zero air-flow, will have bigger error.And must make the airshed of main channel in the laminar flow scope, this point is very important, this means that Reynolds number must be less than or equal to 2000.In addition, the different physical dimension of sampling channel also can be brought bigger influence to measurement performance with the different of restriction device size of making the main channel resistance.
Summary of the invention
Technical matters to be solved by this invention provides a kind of low differential pressure type flow quantity detection mechanism that can reduce turbulent air flow in main gas circuit, improve the flow metering precision.
For solving the problems of the technologies described above, the invention provides the gas flow measurement mechanism under a kind of low pressure low discharge that can satisfy the medical instruments field high-precision requirement, adopt the restriction device of particular design, overcome the use defective of using differential pressure pickup measuring principle itself to bring, and reduced the influence that is brought under the especially low differential pressure low discharge situation to greatest extent, thereby satisfied the use of the high-acruracy survey of breathing medical equipment measuring accuracy.The described factor that influences measuring accuracy comprises: plate hole inlet right angle sharpness, throttling element thickness, throttling element upstream cross sectional plane degree, the pressure position, caliber physical size and driven dimension error amount, step or dislocation that the throttling element annex produces, a series of sizes such as the degree of eccentricity of throttling element, etc.Measuring accuracy requires highly more just must to be controlled these sizes that influences measuring accuracy, and they are reduced to minimum to the influence of measurement result.
For lung ventilator, because whether handy expiratory resistance be lung ventilator a important indicator, directly have influence on the patient respiratory acting, have influence on patient's off line smoothly.So utilize lung ventilator of the present invention not only can effectively reduce expiratory resistance, reduce the patient respiratory acting, and the accurate measurement of the tidal volume that can realize exhaling, the foundation of diagnosis is provided for doctor's clinical practice.
Description of drawings
Accompanying drawing constitutes the part of this instructions, is used for illustrating principle of the present invention with instructions.In the accompanying drawing:
Fig. 1 is the schematic diagram of existing plate hole differential pressure flowmeter.
Fig. 2 is the theory structure synoptic diagram of low differential pressure type flow quantity detection mechanism of the present invention.
Fig. 3 A, 3B and 3C are respectively perspective view, main TV structure synoptic diagram and the side-looking structural representations of the restriction device 3 that adopted in the low differential pressure type flow quantity detection mechanism of the present invention.
Fig. 4 is the spatial structure profile synoptic diagram of the expiration module of lung ventilator, has wherein adopted low differential pressure type flow quantity detection mechanism of the present invention.
Fig. 5 is the three-dimensional sectional structure synoptic diagram of the expiration module of the lung ventilator among Fig. 4.
Number in the figure: 1. main gas circuit; 11. inwall; 12. spacing end face; 2. the heating arrangement of expiration module; 3. restriction device; 31. sleeve; 32. throttle orifice; 33. connecting portion; 34. the axial ledge of restriction device; 35. notch; 41. force samples mouth; 42. force samples mouth; 5. expiration module; 51. expiration module first housing; 52. expiration module second housing; 6. measuring apparatus; 7. turbulent.
Embodiment
Below in conjunction with accompanying drawing exemplary embodiment of the present invention is described.In the accompanying drawing, identical parts are represented with identical label.
The technical solution adopted in the present invention:
As shown in Figure 2, the independently restriction device 3 of in one section round main gas circuit 1, inserting a particular design, described restriction device 3 is nested by several annulus and forms, main gas circuit 1 comprises two thief hatchs 41 and 42, and thief hatch inserts respectively on the entrance and exit of the measuring apparatus 6 that has adopted the high sensitivity quality flow sensor.Also comprise a spacing end face 12 in the main gas circuit 1, described restriction device 3 cooperates installation with described positive stop end 12, and thief hatch 41 and 42 just in time is positioned at the top at described restriction device 3 two ends.
Shown in Figure 3 is described special restriction device 3, and cellular thin slice current limliting can effectively be controlled at air-flow in the laminar flow scope, and each parameter of restriction device 3 all draws through calculation optimization, can guarantee the requirement of high-acruracy survey.And adopted mold production, can effectively guarantee the consistance of each parameter like this.For example: thickness, throttling element upstream cross sectional plane degree, the step that restriction device 3 front and back produce, the right alignment of restriction device 3 and main gas circuit 1.The surfacenesses of restriction device 3 etc. make that the consistance in producing in batches can guarantee.Main gas circuit 1 air-flow produces pressure differential through behind the restriction device 3 before and after it, make a part of gas stream through thief hatch, measures the gas flow of the gas stream of patient's exhalation through direction master gas circuit 1 through high-precision mass sensor.The actual proof of using, the differential flow testing agency of the restriction device of use particular design can satisfy the high-acruracy survey requirement of breathing medical equipment fully.
Fig. 4 is the spatial structure profile synoptic diagram of the expiration module of patent working of the present invention on a kind of therapeutic type lung ventilator, and lung ventilator is a kind of assisted ventilation unit, is connected patient end simultaneously by air intake duct and exhaust tube.The patient discharges gas by respiratory siphon again from lung ventilator air intake duct draw gas.The expiration end of lung ventilator has breathing equipment to be used for measuring the air pressure and the flow of patient's breath.Patent of the present invention just is implemented on the lung ventilator expiration end.Fig. 4 and Fig. 5 have shown a kind of expiration module that has adopted lung ventilator of the present invention, the gas that the patient breathes out enters the expiration module, heating arrangement 2 guarantees that gas is in uniform temperature, condensation vapor influences the sensor measurement precision in the gas that prevents to breathe out, cause differential pressure through restriction device 3, part gas passes through force samples mouth 41 and 42 through mass sensors, thereby records the flow of patient's breath.Last gas is arranged to atmosphere by exhausr port.
Can measure the real-time tidal volume numerical value of patient accurately by this measurement mechanism, for patient's treatment provides reliable data.
Although the present invention is illustrated with reference to accompanying drawing and preferred embodiment, obviously, for a person skilled in the art, under the prerequisite that does not deviate from the spirit and scope of the present invention, can make various changes and variation to the present invention.The various changes of patent of the present invention, the content that changes by appending claims and equivalent thereof contain, and also belong to protection scope of the present invention.
Claims (12)
1. low differential pressure type flow quantity detection mechanism comprises:
Main gas circuit (1);
Restriction device (3) is arranged in the described main gas circuit (1);
First thief hatch (41) and second thief hatch (42) are arranged in the described main gas circuit (1), and lay respectively at the preceding extreme direction and the back extreme direction of described restriction device (3);
Measuring apparatus (6) connects described first thief hatch (41) and described second thief hatch (42),
It is characterized in that: described restriction device (3) has a plurality of around the uniform concentric throttle orifice (32) of central axis.
2. low differential pressure type flow quantity detection mechanism according to claim 1 is characterized in that:
Described main gas circuit (1) cross section is rounded,
Described restriction device (3) comprises the annular sleeve (31) of a plurality of concentric settings.
3. low differential pressure type flow quantity detection mechanism according to claim 2 is characterized in that:
Described a plurality of sleeve (31) connects by connecting portion (33);
Limit between adjacent described sleeve (31) and the corresponding described connecting portion (33) and form described throttle orifice (32).
4. low differential pressure type flow quantity detection mechanism according to claim 3 is characterized in that:
Be formed with in the described main gas circuit (1) and be used to two spacing end faces (12) of the installation inwall (11) of described restriction device (3) being installed and being laid respectively at described installation inwall (11) front-end and back-end;
The rear and front end of described restriction device (3) is formed with radial flange (36) that matches with described installation inwall (11) and the axial ledge (34) that matches with described front/rear end respectively.
5. low differential pressure type flow quantity detection mechanism according to claim 4 is characterized in that:
Described axial ledge (34) along front end is formed with a plurality of notches (35), with at described restriction device (3) described main gas circuit of preceding connection (1) and described first thief hatch (41);
Described axial ledge (34) along the rear end is formed with a plurality of notches (35), to connect described main gas circuit (1) and described second thief hatch (42) in described restriction device (3) back.
6. low differential pressure type flow quantity detection mechanism according to claim 1 is characterized in that:
Described measuring apparatus (6) is a mass sensor.
7. low differential pressure type flow quantity detection mechanism according to claim 2 is characterized in that:
The xsect of described restriction device (3) is cellular.
8. lung ventilator, described lung ventilator has expiration module (5), it is characterized in that, is provided with each described low differential pressure type flow quantity detection mechanism in the aforementioned claim 1 to 5 in the described expiration module (5).
9. lung ventilator according to claim 6 is characterized in that:
Second housing (52) that described expiration module (5) has first housing (51) and is positioned at described first housing (51) rear end, described first housing (51) and described second housing (52) limit described main gas circuit (1) jointly;
Described restriction device (3) is arranged between described first housing (51) and described second housing (52).
10. lung ventilator according to claim 6 is characterized in that:
Be formed with described installation inwall (11) on described second housing (52);
Described restriction device (3) is installed in the described installation inwall (11), is supported by described second housing (52).
11. lung ventilator according to claim 8 is characterized in that:
Described first thief hatch (41) and second thief hatch (42) are formed on described second housing (52);
Described second housing (52) rear end forms exhausr port.
12. lung ventilator according to claim 8 is characterized in that: the arranged outside of described expiration module (5) has heating arrangement (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007103083190A CN101311683A (en) | 2007-12-29 | 2007-12-29 | Breathing machine and its low differential pressure type flow quantity detection mechanism |
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| CNA2007103083190A CN101311683A (en) | 2007-12-29 | 2007-12-29 | Breathing machine and its low differential pressure type flow quantity detection mechanism |
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| CN101311683A true CN101311683A (en) | 2008-11-26 |
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| CNA2007103083190A Pending CN101311683A (en) | 2007-12-29 | 2007-12-29 | Breathing machine and its low differential pressure type flow quantity detection mechanism |
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| CN101934109A (en) * | 2009-07-02 | 2011-01-05 | 北京谊安医疗系统股份有限公司 | Flow sampling device |
| CN101554510B (en) * | 2009-05-18 | 2011-05-11 | 浙江新丰医疗器械有限公司 | Expiratory valve for respirator |
| CN102500026A (en) * | 2011-12-01 | 2012-06-20 | 于邦仲 | Air passage system of respirator |
| CN103048022A (en) * | 2012-12-21 | 2013-04-17 | 上海华强浮罗仪表有限公司 | Balance type flow meter throttling element |
| CN103175581A (en) * | 2011-12-21 | 2013-06-26 | 新奥科技发展有限公司 | Flow channel structure and fluid flow measurement device |
| CN103893863A (en) * | 2012-12-26 | 2014-07-02 | 北京谊安医疗系统股份有限公司 | Differential pressure type flow sensor accumulated water processing device and breathing machine with same |
| CN104225756A (en) * | 2013-06-14 | 2014-12-24 | 北京谊安医疗系统股份有限公司 | Exhalation valve |
| CN104880570A (en) * | 2014-02-28 | 2015-09-02 | 北京谊安医疗系统股份有限公司 | Flow velocity measuring apparatus and method used for inhalation end in respirator |
| CN106535971A (en) * | 2014-06-03 | 2017-03-22 | 费雪派克医疗保健有限公司 | Flow mixers for respiratory therapy systems |
| CN107101688A (en) * | 2017-04-21 | 2017-08-29 | 合肥江航飞机装备有限公司 | A kind of laminar-type gas flowmeter and scaling method |
| CN107144311A (en) * | 2017-04-21 | 2017-09-08 | 合肥江航飞机装备有限公司 | A kind of small-flow gas flowmeter and scaling method |
| CN107427654A (en) * | 2015-03-31 | 2017-12-01 | 皇家飞利浦有限公司 | Flow member |
| CN107631765A (en) * | 2017-09-05 | 2018-01-26 | 合肥科迈捷智能传感技术有限公司 | A kind of differential pressure flowmeter method for treating water |
| CN108088511A (en) * | 2016-11-21 | 2018-05-29 | 马宁敏 | A kind of thin-walled garden tubular centrifugal gas mass flowmenter |
| CN108303149A (en) * | 2018-02-23 | 2018-07-20 | 南京亿准纳自动化控制技术有限公司 | Orifice union, rectification and flow measurement device |
| CN108303150A (en) * | 2018-02-23 | 2018-07-20 | 南京亿准纳自动化控制技术有限公司 | Orifice union, rectification and flow measurement device |
| CN108332807A (en) * | 2018-02-23 | 2018-07-27 | 南京亿准纳自动化控制技术有限公司 | Orifice union, rectification and flow measurement device |
| CN108577845A (en) * | 2018-04-18 | 2018-09-28 | 中国科学院电子学研究所 | Throttling element, differential pressure type lung function parameter monitoring device and flow determine method |
| 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 |
| WO2019161716A1 (en) * | 2018-02-23 | 2019-08-29 | 南京亿准纳自动化控制技术有限公司 | Throttling component and rectification and flow measurement device |
| CN110392589A (en) * | 2017-02-20 | 2019-10-29 | 维曼急救医疗科技两合公司 | The equipment for breathing with differential pressure pick-up |
| CN110681015A (en) * | 2019-11-22 | 2020-01-14 | 湖南万脉医疗科技有限公司 | Breathing machine sampling structure |
| CN110681013A (en) * | 2019-10-23 | 2020-01-14 | 深圳市科曼医疗设备有限公司 | Nonlinear air resistance and flushing module and breathing machine |
| CN111426354A (en) * | 2020-04-15 | 2020-07-17 | 江苏鑫亚达仪表制造有限公司 | Flow measuring mechanism and measuring device |
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| WO2022110710A1 (en) * | 2020-11-30 | 2022-06-02 | 深圳市科曼医疗设备有限公司 | Differential-pressure flow sensor and ventilator |
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| CN116754027A (en) * | 2023-05-30 | 2023-09-15 | 深圳融昕医疗科技有限公司 | Air flow sensor, air circuit system based on air flow sensor and ventilation treatment equipment |
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| CN101554510B (en) * | 2009-05-18 | 2011-05-11 | 浙江新丰医疗器械有限公司 | Expiratory valve for respirator |
| CN101934109A (en) * | 2009-07-02 | 2011-01-05 | 北京谊安医疗系统股份有限公司 | Flow sampling device |
| CN102500026A (en) * | 2011-12-01 | 2012-06-20 | 于邦仲 | Air passage system of respirator |
| CN103175581A (en) * | 2011-12-21 | 2013-06-26 | 新奥科技发展有限公司 | Flow channel structure and fluid flow measurement device |
| CN103048022A (en) * | 2012-12-21 | 2013-04-17 | 上海华强浮罗仪表有限公司 | Balance type flow meter throttling element |
| CN103893863A (en) * | 2012-12-26 | 2014-07-02 | 北京谊安医疗系统股份有限公司 | Differential pressure type flow sensor accumulated water processing device and breathing machine with same |
| CN104225756A (en) * | 2013-06-14 | 2014-12-24 | 北京谊安医疗系统股份有限公司 | Exhalation valve |
| CN104880570A (en) * | 2014-02-28 | 2015-09-02 | 北京谊安医疗系统股份有限公司 | Flow velocity measuring apparatus and method used for inhalation end in respirator |
| CN106535971A (en) * | 2014-06-03 | 2017-03-22 | 费雪派克医疗保健有限公司 | Flow mixers for respiratory therapy systems |
| CN106535971B (en) * | 2014-06-03 | 2020-12-04 | 费雪派克医疗保健有限公司 | Flow mixer for respiratory therapy system |
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| JP2018509989A (en) * | 2015-03-31 | 2018-04-12 | コーニンクレッカ フィリップス エヌ ヴェＫｏｎｉｎｋｌｉｊｋｅ Ｐｈｉｌｉｐｓ Ｎ．Ｖ． | Flow member |
| CN108088511A (en) * | 2016-11-21 | 2018-05-29 | 马宁敏 | A kind of thin-walled garden tubular centrifugal gas mass flowmenter |
| CN108088511B (en) * | 2016-11-21 | 2020-04-10 | 马宁敏 | Thin-wall cylindrical centrifugal gas flowmeter |
| CN110392589B (en) * | 2017-02-20 | 2023-03-21 | 维曼急救医疗科技两合公司 | Breathing apparatus with differential pressure sensor |
| CN110392589A (en) * | 2017-02-20 | 2019-10-29 | 维曼急救医疗科技两合公司 | The equipment for breathing with differential pressure pick-up |
| CN107144311B (en) * | 2017-04-21 | 2020-04-07 | 合肥江航飞机装备有限公司 | Small-flow gas flowmeter and calibration method |
| CN107101688B (en) * | 2017-04-21 | 2020-04-07 | 合肥江航飞机装备有限公司 | Laminar flow type gas flowmeter and calibration method |
| CN107101688A (en) * | 2017-04-21 | 2017-08-29 | 合肥江航飞机装备有限公司 | A kind of laminar-type gas flowmeter and scaling method |
| CN107144311A (en) * | 2017-04-21 | 2017-09-08 | 合肥江航飞机装备有限公司 | A kind of small-flow gas flowmeter and scaling method |
| CN107631765A (en) * | 2017-09-05 | 2018-01-26 | 合肥科迈捷智能传感技术有限公司 | A kind of differential pressure flowmeter method for treating water |
| CN107631765B (en) * | 2017-09-05 | 2020-07-07 | 合肥科迈捷智能传感技术有限公司 | Differential pressure flowmeter water treatment method |
| 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 |
| CN108332807A (en) * | 2018-02-23 | 2018-07-27 | 南京亿准纳自动化控制技术有限公司 | Orifice union, rectification and flow measurement device |
| CN108303149A (en) * | 2018-02-23 | 2018-07-20 | 南京亿准纳自动化控制技术有限公司 | Orifice union, rectification and flow measurement device |
| CN108303150A (en) * | 2018-02-23 | 2018-07-20 | 南京亿准纳自动化控制技术有限公司 | Orifice union, rectification and flow measurement device |
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| WO2019161716A1 (en) * | 2018-02-23 | 2019-08-29 | 南京亿准纳自动化控制技术有限公司 | Throttling component and rectification and flow measurement device |
| CN108577845A (en) * | 2018-04-18 | 2018-09-28 | 中国科学院电子学研究所 | Throttling element, differential pressure type lung function parameter monitoring device and flow determine method |
| CN108577845B (en) * | 2018-04-18 | 2021-04-06 | 中国科学院电子学研究所 | Throttling element, differential pressure type lung function parameter monitoring device and flow determining method |
| CN110681013A (en) * | 2019-10-23 | 2020-01-14 | 深圳市科曼医疗设备有限公司 | Nonlinear air resistance and flushing module and breathing machine |
| CN110681015A (en) * | 2019-11-22 | 2020-01-14 | 湖南万脉医疗科技有限公司 | Breathing machine sampling structure |
| CN111426354A (en) * | 2020-04-15 | 2020-07-17 | 江苏鑫亚达仪表制造有限公司 | Flow measuring mechanism and measuring device |
| WO2021218133A1 (en) * | 2020-04-29 | 2021-11-04 | 南京润楠医疗电子研究院有限公司 | Bidirectional double-differential-pressure respiratory flow detection and sensing apparatus and method |
| FR3110690A1 (en) * | 2020-05-20 | 2021-11-26 | Renault S.A.S | Flowmeter comprising at least one tube with an internal grid |
| WO2022110710A1 (en) * | 2020-11-30 | 2022-06-02 | 深圳市科曼医疗设备有限公司 | Differential-pressure flow sensor and ventilator |
| WO2022110715A1 (en) * | 2020-11-30 | 2022-06-02 | 深圳市科曼医疗设备有限公司 | Differential pressure type flow sensor and ventilator |
| CN114279504A (en) * | 2021-12-24 | 2022-04-05 | 广州蓝仕威克医疗科技有限公司 | High-detection-precision differential pressure flowmeter capable of being disinfected repeatedly |
| CN114279504B (en) * | 2021-12-24 | 2022-07-22 | 广州蓝仕威克医疗科技有限公司 | High-detection-precision differential pressure flowmeter capable of being disinfected repeatedly |
| EP4279879A4 (en) * | 2021-12-24 | 2024-08-28 | Guangzhou Landswick Medical Tech Ltd | High-measurement-precision differential pressure flowmeter capable of being repeatedly sterilized |
| DE102023113392B3 (en) | 2023-05-23 | 2024-06-20 | Ifm Electronic Gmbh | Flow measuring device |
| CN116754027A (en) * | 2023-05-30 | 2023-09-15 | 深圳融昕医疗科技有限公司 | Air flow sensor, air circuit system based on air flow sensor and ventilation treatment equipment |
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Application publication date: 20081126 |