CN102580448B - Gas filter device - Google Patents
Gas filter device Download PDFInfo
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- CN102580448B CN102580448B CN201210079222.8A CN201210079222A CN102580448B CN 102580448 B CN102580448 B CN 102580448B CN 201210079222 A CN201210079222 A CN 201210079222A CN 102580448 B CN102580448 B CN 102580448B
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Abstract
The invention relates to the technical field of filter equipment, in particular to a filter device for human respiratory non-sampled gas. The filter device comprises a filter cavity and a water storage cavity communicated with the filter cavity, wherein the filter cavity is arranged vertical to the horizontal plane and communicated with the water storage cavity; and the filter cavity comprises an air inlet passage, a gas-liquid separation cavity, an air outlet passage and a drainage passage which are communicated with one another, wherein the air inlet passage is arranged at the initial end of the gas-liquid separation cavity, the air outlet passage and the drainage passage are arranged at the tail end of the gas-liquid separation cavity, and the drainage passage is communicated with the water storage cavity. The filter device is characterized in that: a hydrophobic membrane is arranged in the gas-liquid separation cavity, and the air passage of the gas-liquid separation cavity is arranged in a level or descending trend from the initial end to the tail end. The gas filter device can be used for single-way air suction so as to improve the reliability and the using convenience of a by-pass flow gas sampling system and promote integration and miniaturization of the system; and the gas filter device has good compatibility and good gas flow performance.
Description
Technical field
the present invention relates to breathing detection equipment technical field, be specifically related to a kind of for the filter to human body respiration end sample gas.
Background technology
medical domain has pair human body respiration end gas to carry out the application demand of Measurement and analysis, as ETCO2(end-expiratory carbon dioxide monitoring) module and anesthesia module.Comparatively common application mode is side stream type, and, by the breathing end gas of the sampling human bodies such as nasal tube or face shield, the test module being transported in machine by microtubule carries out Measurement and analysis.The gas that the sample gas of side stream type alternately goes out for human body respiration with human body respiration and the air of suction: characteristics of contaminated respiratory droplets gas is 37 DEG C of saturated humidity gases, containing more steam, transports middle the possible of condensation that exist at microtubule; Characteristics of contaminated respiratory droplets gas can contain a certain amount of dust.If above impurity accumulates to the measuring accuracy that can have a strong impact on module inner sensor in test module gas circuit, and can cause damage to air pump, so for side stream type gas-detecting device, must carry out dry filter before it enters test module.
in order to address the above problem, need to adopt gas-filtering device to carry out dry filter to gas; Original gas-filtering device is the degassed body filter apparatus configuration based on condensation technology, in microtubule, design a larger cavity as gas-liquid separation chamber, sample gas reduces sharply and there will be steam condensation in the velocity pressure at this place, and form moist gradient under Action of Gravity Field, cavity top is dry gas, and bottom is for containing more condensing droplet.Now, the dry gas on cavity top is drawn into module and tests, and needs the second tunnel to bleed simultaneously and pumps the steam gathering cavity bottom to maintain the operation of gas-liquid separation chamber sustainability.Bleed and will enter de-gas-filtering device water storage cavity in the second tunnel, condensed water will gather storage here; The de-gas-filtering device of this kind of structure dewaters thorough not, simultaneously larger to the isometrical property destruction of air-flow, affects waveform quality, and is difficult to the dust in sample gas effectively to filter.
in order to address the above problem; existing gas-filtering device generally adopts the technology that dewaters of the filtration based on PTFE hydrophobic membrane; it has the effect of good filtering steam; can take into account filter dirt simultaneously; the current de-gas-filtering device based on PTFE hydrophobic membrane technology; gas-liquid separation chamber interval PTFE hydrophobic membrane; for reducing gas circuit dead band; the common narrow space of gas-liquid separation chamber; need to assist draining by traditional two-way exhaust technique; for protecting the gas circuit rear end of bleeding, the second tunnel, bleed and also adopted PTFE to filter protection in the second tunnel.The core of this de-gas-filtering device is the design of gas-liquid separation chamber.
adopt the gas-liquid separation chamber of PTFE hydrophobic membrane gas-filtering device, structure, can be divided into the design of pipeline type gas-liquid separation chamber and the design of dish-shaped gas-liquid separation chamber.
wherein, the principal character of pipeline type gas-liquid separation chamber is that gas-liquid separation chamber is long and narrow pipe-like, PTFE hydrophobic membrane rip cutting interval is divided into ante-chamber and back cavity in pipeline, air intake duct is positioned at pipeline ante-chamber top, air exhaust duct is positioned at pipeline back cavity end, and drainage i.e. the second air exhaust duct is positioned at ante-chamber end, can realize so the larger PTFE usable floor area of realization in limited bulk, have the isometrical property of good air-flow, this has lowered the impact of de-gas-filtering device for gas test waveform greatly simultaneously.Common pipeline type gas-liquid separation chamber can adopt: looped pipeline structure, vortex shape pipeline; Adopt pipeline type gas-liquid separation cavity configuration manufacturing process comparatively simple, but exist air-flow etc. poor through property, the problem that waveform quality is not good.
and adopt the design of dish-shaped gas-liquid separation chamber, its principal character is that gas-liquid separation chamber is dish, and PTFE hydrophobic membrane rip cutting interval is divided into ante-chamber and back cavity in pipeline, and ante-chamber connects air intake duct and i.e. the second air exhaust duct of drainage, back cavity UNICOM air exhaust duct, the position of cavity does not have strict constraint.
adopt the de-gas-filtering device of above structure gas-liquid separation chamber all to adopt the two-way design of bleeding, the throughput that two-way is bled also needs to keep certain proportion, this just requires ETCO2 module also will support two-way bleed and will strictly mate with the vapour lock characteristic of gas-filtering device, and this measure of precision to module has proposed very high requirement; This has increased the manufacturing cost of module on the one hand, has limited to the compatibility of module for gas-filtering device simultaneously, and the back end test module corresponding with above gas-filtering device all can only be applied to this gas-filtering device; In addition module also needs two detachable gas circuits to be connected with gas-filtering device, and the air-tightness to whole system and reliability have proposed very high request.This integrated and miniaturization for by-pass flow gas sampling system causes restriction.
Summary of the invention
for above problem, the invention provides a kind of good compatibility and good air-flow performance, can single channel be bled and reliability is high gas-filtering device.
the object of the invention is to be achieved through the following technical solutions: the invention provides a kind of gas-filtering device, comprise: filter chamber and the water storage cavity being communicated with it, described filter chamber is arranged perpendicular to horizontal plane, and communicate with this water storage cavity, described filter chamber comprises: the air intake duct, gas-liquid separation chamber, gas off-take and the drainage that communicate with each other, described air intake duct is arranged on the top of gas-liquid separation chamber, described gas off-take and drainage are arranged on the end of gas-liquid separation chamber, and described drainage is connected with described water storage cavity; Wherein, in described gas-liquid separation chamber, be provided with hydrophobic membrane, the cavity gas circuit of this gas-liquid separation chamber is level by top to end or downward trend is arranged.
improve as one, described gas-liquid separation chamber is arranged vertically, its cavity is pipe-like, this gas-liquid separation chamber comprises: cut apart the first cavity and the second cavity by hydrophobic membrane, the top of described the first cavity is connected with described air intake duct, its end is connected with described drainage, and the end of described the second cavity is connected with described gas off-take; Top and the end of described gas-liquid separation chamber are equipped with rectification section.
further, described gas-liquid separation chamber the first cavity and the second cavity be in top and the equal interlaced arrangement of end, and the part sealing of staggering of the top of described the first cavity forms air inlet rectification section, and the part sealing of staggering of the second cavity end forms the rectification section of bleeding; Described drainage and described water storage cavity are and are arranged vertically.
on the basis of said mechanism, described the first cavity cross-section is rectangle, and described the second cavity cross-section is circular arc, and described air intake duct is consistent with the internal diameter of air exhaust duct, described air inlet rectification section and the rectification section of bleeding be rigid sidewalls.
further, described air intake duct and air exhaust duct and described gas-liquid separation chamber vertical connection respectively.
improve as one, the cavity of described gas-liquid separation chamber is snake pipe shape, and described gas off-take is provided with protection filter core.
improve as another, top and the middle section position of described gas-liquid separation chamber are provided with horizontal segment.
improve as another, described the first cavity latter end is arc descending branch.
improve as one, the cavity of described gas-liquid separation chamber is " W " shape pipe-like, and described gas-liquid separation chamber has the straight pipeline section under being tilted to.
the gas-liquid separation chamber cavity gas circuit of gas-filtering device of the present invention has adopted by top to end and has been level or downward trend is arranged, gas-liquid separation chamber is wriggled downwards all the time, the drop of the ante-chamber cohesion of gas-liquid separation chamber constantly flows to pipe end under the effect of air-flow and gravity own, the effect that more approaches end gravity is more taken as the leading factor, finally accumulates to gas-liquid separation chamber ante-chamber end.Straight-through water storage cavity herein, drop will flow into water storage cavity under the effect of gravity.Gas-filtering device of the present invention can carry out single channel bleeds, and has promoted reliability and the ease of use of by-pass flow gas sampling system, has promoted the integrated and miniaturization of system, and has good compatibility and good air-flow performance.Before and after gas-liquid separation chamber simultaneously of the present invention, enter air exhaust duct and be all designed with air-flow rectification, this has effectively been avoided the impact of air-flow high speed steering to hydrophobic membrane, has reduced sinuous flow.
Brief description of the drawings
for ease of explanation, the present invention is described in detail by following preferred embodiment and accompanying drawing.
fig. 1 is gas circuit principle schematic diagram of the present invention;
fig. 2 is that snake pipe type gas-liquid separation chamber of the present invention is not installed the structural representation of hydrophobic membrane;
fig. 3 is that snake pipe type gas-liquid separation chamber of the present invention is installed the structural representation after hydrophobic membrane;
fig. 4 is that snake pipe gas-liquid separation chamber of the present invention is by A-A direction cutaway view in Fig. 3;
fig. 5 is the structural representation of another embodiment of the present invention;
fig. 6 is most preferred embodiment structural representation of the present invention;
fig. 7 is the rise time contrast situation of filter of the present invention and existing filter.
Detailed description of the invention
in order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
refer to Fig. 1 to Fig. 4, the invention provides a kind of gas-filtering device, comprising: comprise filter chamber and water storage cavity 5, filter chamber comprises pipe-like gas-liquid separation chamber, air intake duct 2, gas off-take 3, drainage 4, protection filter core 6 and hydrophobic membrane 7.Gas-liquid separation chamber is connected with air intake duct 2, gas off-take 3 and drainage 4; drainage 4 is connected with water storage cavity 5; protection filter core 6 is arranged in gas off-take 3; hydrophobic membrane 7 is arranged in gas-liquid separation chamber; in the present embodiment, gas-liquid separation chamber is arranged vertically; gas-liquid separation chamber to end all the time in level or decline process, does not have lifting section by top.
wherein gas-liquid separation chamber is divided into the first cavity 1a and the second cavity 1b by hydrophobic membrane 7.The first cavity 1a top connects air intake duct 2, and end connects drainage 4.As Fig. 4 midship section, the first cavity 1a is square-section, because having water droplet in it flows, and in cavity, particularly the steam flowing velocity at the top of the first cavity 1a is higher, and special ante-chamber front end, if now there is cavity to turn to, in chamber, steam will act on cavity wall with the high acceleration that turns to, and is designed to square to slow down the impact of steam to hydrophobic membrane.The second cavity 1b only connects gas off-take 3 at pipe end, and its cross section is circular-arc cross section, because what flow in back cavity be the clean gas of super-dry, effectively the isometrical property of lift gas is mobile to adopt arc section, reduces gas low regime simultaneously.
as shown in Figure 2, gas-liquid separation chamber the first cavity 1a of the present invention and the second cavity 1b are at top and all interleaved certain distances of end, the stagger part sealing of the top of the first cavity 1a forms air inlet rectification section 8, the stagger part sealing of the second cavity 1b end forms the rectification section 9 of bleeding, and air inlet rectification section 8 and the rectification section 9 of bleeding are rigid sidewalls; At gas-liquid separation chamber top, the second cavity 1b is short compared with the first cavity 1a, has avoided the first cavity 1a and junction air intake duct 2; And endways, the first cavity 1a is short compared with the second cavity 1b, avoid equally the junction of the second cavity 1b and air exhaust duct 3.Air intake duct 2 of the present invention and air exhaust duct 3 are all vertical connection with gas-liquid separation tube chamber, the internal diameter of air intake duct 2 and air exhaust duct 3 is consistent, cross-sectional area and the above-mentioned airway of the first cavity 1a and the second cavity 1b are also very approaching simultaneously, in conjunction with gas rectification section, in gas-filtering device of the present invention, gas has kept isometrical property to flow substantially.
first, breath sample enters the first cavity 1a of gas-liquid separation chamber by air intake duct 2, when high velocity air acutely turns in connection position, air-flow can be very violent disorderly, after 8 rectifications of air inlet rectification section, air-flow is very neat, Main Current is to parallel with hydrophobic membrane 7 simultaneously, this has not only been avoided the impact to flexible hydrophobic membrane 7, and air-flow has kept good isometrical property to flow in gas-liquid separation chamber simultaneously, and there is certain minimizing in air turbulence district and dead band; Then, sample gas flows and sees through hydrophobic membrane 7 along the first cavity 1a cavity terminad and flows to the second cavity 1b, and the interior gas of the first cavity 1a constantly reduces and steam is constant, makes in chamber, more past rear end air velocity lower, and humidity is higher.And the second cavity 1b inner drying gas is more and more, make its more past rear end air velocity faster.Finally, at gas-liquid separation chamber end, unstable air-flow in the first cavity 1a, steam and drop gather herein, flow into water storage cavity 5 store under the effect of self gravitation by drainage 4.And reach the highest through the dry gas speed of filtering in the second cavity 1b, extract out by gas off-take.Meanwhile, protection filter core 6 is set in gas off-take 3 of the present invention, it meets with steam and just can stop up.If calamitous damage appears in gas-liquid separation chamber, when steam is drawn into gas off-take 3, protection filter core will effectively stop up closed conduct, avoids steam to enter rear module and causes damage.
if Fig. 5 is the another kind of embodiment of the present invention, the gas-liquid separation chamber of this kind is similar W shape, and gas-liquid separation chamber has the straight pipeline section 10 under being tilted to, and can realize like this gas-liquid separation cavity length longer in less elevation.
fig. 6 is the present invention's most preferred embodiment.Gas-liquid separation chamber entirety is snakelike wriggles downwards, we are designed with a duct section 10 of level in the beginning of gas-liquid separation chamber section and stage casing, simultaneously whole cavity concentrate on diameter 16mm with in interior circle so that manufacture, realized cavity longer in less elevation to ensure enough PTFE hydrophobic membrane filter areas.Show according to our research, gas-liquid separation chamber the first cavity 1a has higher air velocity in begin section and stage casing, enough drive liquid short movement backward, thus in the present invention's most preferred embodiment, be designed with horizontal segment 10 in gas-liquid separation chamber front end and stage casing so that the lengthening of gas-filtering device apart from design.And air velocity is lower in the first cavity 1a latter end, the present embodiment is designed to arc descending branch 11 and is assisted draining with the gravity that utilizes more, in segmental arc, the centrifugal action of air-flow accumulates on pipe side wall steam simultaneously, be convenient to concentrate and flow, final steam converges to the end of the first cavity 1a, flows into drainage 4.
the gas-liquid separation chamber front-end and back-end of the present embodiment are all designed with rectification section.Wherein also perk slightly of the end of the second cavity 1b, the more effective liquid mistake of avoiding sucks.
if Fig. 7 is under same case and the speed of exhaust, the rise time contrast of gas-filtering device of the present invention and existing gas-filtering device, this parameter is the important judging quota of gas-filtering device performance, the method of this test, under the same conditions, is tested the concentration rise time of the higher concentration CO2 gas of gas coming through filter.As can be seen from Figure: when waveform ascending amount reaches 100%, the present invention is consuming time minimum, be secondly traditional two-way pump-line type gas-liquid separation chamber scheme, be finally classical dish-like shapes gas-liquid separation chamber scheme; In same time, waveform ascending amount maximum of the present invention.Bleed for a long time to test shows simultaneously, and it is full that gas-filtering device sustainability of the present invention moves to water storage cavity water.
the foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (8)
1.
a kind of gas-filtering device, comprise: filter chamber and the water storage cavity being communicated with it, described filter chamber is arranged perpendicular to horizontal plane, and communicate with this water storage cavity, described filter chamber comprises: the air intake duct, gas-liquid separation chamber, gas off-take and the drainage that communicate with each other, described air intake duct is arranged on the top of gas-liquid separation chamber, and described gas off-take and drainage are arranged on the end of gas-liquid separation chamber, and described drainage is connected with described water storage cavity; It is characterized in that, in described gas-liquid separation chamber, be provided with hydrophobic membrane, the cavity gas circuit of this gas-liquid separation chamber is level by top to end or downward trend is arranged; Described gas-liquid separation chamber comprises by hydrophobic membrane cuts apart the first cavity and the second cavity, the top of described the first cavity is connected with described air intake duct, its end is connected with described drainage, the end of described the second cavity is connected with described gas off-take, described gas-liquid separation chamber is arranged vertically, its cavity is pipe-like, and top and the end of described gas-liquid separation chamber are equipped with rectification section.
2.
filter according to claim 1, it is characterized in that, described gas-liquid separation chamber the first cavity and the second cavity be in top and the equal interlaced arrangement of end, and the part sealing of staggering of the top of described the first cavity forms air inlet rectification section, and the part sealing of staggering of the second cavity end forms the rectification section of bleeding; Described drainage and described water storage cavity are and are arranged vertically.
3.
filter according to claim 2, is characterized in that, described the first cavity cross-section is rectangle, and described the second cavity cross-section is circular arc, and described air intake duct is consistent with the internal diameter of gas off-take, described air inlet rectification section and the rectification section of bleeding be rigid sidewalls.
4.
filter according to claim 3, is characterized in that, described air intake duct and gas off-take and described gas-liquid separation chamber be vertical connection respectively.
5.
filter according to claim 4, is characterized in that, the cavity of described gas-liquid separation chamber is snake pipe shape, and described gas off-take is provided with protection filter core.
6.
filter according to claim 5, is characterized in that, top and the middle section position of described gas-liquid separation chamber are provided with horizontal segment.
7.
filter according to claim 6, is characterized in that, described the first cavity latter end is arc descending branch.
8.
filter according to claim 1, is characterized in that, the cavity of described gas-liquid separation chamber is " W " shape pipe-like, and described gas-liquid separation chamber has the straight pipeline section under being tilted to.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210079222.8A CN102580448B (en) | 2012-03-23 | 2012-03-23 | Gas filter device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210079222.8A CN102580448B (en) | 2012-03-23 | 2012-03-23 | Gas filter device |
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| CN102580448A CN102580448A (en) | 2012-07-18 |
| CN102580448B true CN102580448B (en) | 2014-06-25 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103876744B (en) * | 2014-03-26 | 2016-08-24 | 深圳市理邦精密仪器股份有限公司 | Water trap, method and system for gas sampling |
| CN106582127B (en) * | 2016-12-13 | 2018-12-04 | 北京中电科电子装备有限公司 | A kind of vacuum filtering system and method for thinned machine |
| CN106629928B (en) * | 2017-01-19 | 2018-10-02 | 中国石油大学(华东) | A kind of gas and water separator and its separation method with hydrophobic surface filter housing |
| EP3589385B1 (en) * | 2017-02-28 | 2022-11-02 | Fresenius Hemocare Italia S.r.l. | Hydrophobic filter for filtering an airflow or another gaseous flow in a medical application |
| CN117398770A (en) * | 2018-03-30 | 2024-01-16 | 东营胜蓝石油科技开发有限公司 | Gas-liquid separation device |
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| CN101773784A (en) * | 2009-01-08 | 2010-07-14 | 天津海之凰科技有限公司 | Vacuum membrane distillation device and method thereof |
| CN101920169A (en) * | 2009-06-16 | 2010-12-22 | 吕晓龙 | Membrane evaporating and concentrating method and device |
| CN202033291U (en) * | 2011-03-01 | 2011-11-09 | 北京瑞利分析仪器有限公司 | Liquid driving sampling device capable of realizing steam reaction under constant voltage and constant current |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2389529C2 (en) * | 2004-11-05 | 2010-05-20 | Дональдсон Компани, Инк. | Filtration material (versions) and method of filtration (versions) |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101773784A (en) * | 2009-01-08 | 2010-07-14 | 天津海之凰科技有限公司 | Vacuum membrane distillation device and method thereof |
| CN101920169A (en) * | 2009-06-16 | 2010-12-22 | 吕晓龙 | Membrane evaporating and concentrating method and device |
| CN202033291U (en) * | 2011-03-01 | 2011-11-09 | 北京瑞利分析仪器有限公司 | Liquid driving sampling device capable of realizing steam reaction under constant voltage and constant current |
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