CN103852115B - A kind of mixed gas flow detector - Google Patents
A kind of mixed gas flow detector Download PDFInfo
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- CN103852115B CN103852115B CN201410110713.3A CN201410110713A CN103852115B CN 103852115 B CN103852115 B CN 103852115B CN 201410110713 A CN201410110713 A CN 201410110713A CN 103852115 B CN103852115 B CN 103852115B
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- bypass duct
- pipeline
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- gas flow
- horizontal tube
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Abstract
The present invention relates to a kind of mixed gas flow detector, it is characterised in that include many snorkels, each snorkel is equipped with the first check valve, and is connected to the first bypass duct and the second bypass duct；First bypass duct includes horizontally disposed horizontal tube and is connected to open to atmosphere first vertical pipeline of company and second vertical pipeline at horizontal tube two ends, first vertical pipeline connects the first connection pipeline, the middle part of horizontal tube is provided with conduction fluid column, it is provided with resistance unit in first bypass duct, resistance unit runs through described horizontal tube, and connects control chip；Second bypass duct is provided with pneumatic type three-way control valve and effusion meter, and the 3rd port connection blender of pneumatic type three-way control valve, second connects pipeline is provided with the second check valve；Described in the outlet of described second bypass duct, first connects pipeline.The present invention can accurately go out the change of the detection micrometeor of interior 10ml per hour, simple in construction, and detection is accurate, precision is high；And reverse changes in flow rate can be detected.
Description
Technical field
The present invention relates to a kind of detection of gas flow rate instrument, refer specifically to the mixed of a kind of long-time interior single stream micrometeor change
Close detection of gas flow rate instrument.
Background technology
The detection of gas flow for convenience, people devise the detection of gas flow rate instrument of various structures.The most conventional gas
Body flow detector contributes to greatly detect the continuously air-flow of big flow, to low discharge or the detection of micrometeor tolerance
Insensitive, even inspection does not measures, and especially in long period, the flow of the change of air-flow micrometeor, such as 10ml/h becomes
Change, or to the changes in flow rate that some cut in and out, use flow detector of the prior art cannot detect at all.
In some particular/special requirements, need two strands or use after more multiply air-flow carries out accurate mixture, such as intensive care unit,
The interior gas of infant incubator, etc.；These places are the strictest to the concentration requirement of component each in mixed gas, each air-flow
Being essentially all isobaric dispensing, during supplying gas, the trace change of per share air-flow is required for accurately detecting and controlling, particularly
Use the detection of back draught under kinds of gas sources normal operation.Currently available technology all cannot be accomplished.
Summary of the invention
The technical problem to be solved is that the present situation for prior art provides one can be accurately detected each stock
Air-flow for a long time in small flowed fluctuation and the mixed gas flow of back draught flow that caused by working conditions change
Detector.
The present invention solves the technical scheme that above-mentioned technical problem used: this mixed gas flow detector, its feature exists
In including the many snorkels for carrying each gas to be mixed, each snorkel is equipped with and limits gas flow blender
First check valve；
The first bypass duct and the second bypass duct it is connected on each described snorkel；
Wherein, described first bypass duct includes horizontally disposed horizontal tube and be connected to horizontal tube two ends first is erected
Straight pipeline and the second vertical pipeline, the outlet of described first, second vertical pipeline all connects air, and first, second
Second switch valve and the 3rd switch valve it is respectively equipped with on vertical pipeline；Described first vertical pipeline connects the first connecting tube
Road, this first entrance connecting pipeline connects described snorkel and is positioned at the upstream of described first check valve；Described horizontal tube
Middle part be provided with conduction fluid column, be provided with resistance unit in described first bypass duct, this resistance unit runs through described horizontal tube, and
And this resistance unit connects control chip；
Described second bypass duct is provided with effusion meter, the entrance of described second bypass duct and described first bypass duct
Outlet connects the first port and the second port, the 3rd end of this pneumatic type three-way control valve of pneumatic type three-way control valve respectively
Mouth is by blender described in the second connection pipeline communication, and described second connection pipeline is provided with control gas and is mixed by described
Clutch flows to the second check valve of described second bypass duct；
Described in the outlet of described second bypass duct, first connects pipeline.
Preferably, it is located by connecting together by connecting rod connection between each described snorkel.
In order to timely and accurately detect this detector air-tightness, this mixed gas flow detector also includes water bath, its
Its parts is submerged in the water-bath of this water bath.
As improvement, it is also possible to connecting described first and be additionally provided with switch valve on pipeline, it is other that this switch valve is positioned at described first
The upstream of road pipeline and the downstream of the second bypass duct.Can control whether system easily by the setting of this switch valve
The fluctuation of middle air-flow detects.
In above-mentioned each scheme, first bypass caliber with conduction fluid column first bypass under its own face tension force effect energy
Enough one-tenth one certainly builds up body, not scattering is as the criterion then；Preferably, described first bypass caliber be 4-8mm, described in lead
The a length of 5-10mm of electro-hydraulic post.
Compared with prior art, micrometeor detector provided by the present invention not only can detect regular flow, and can be accurate
Go out the change of the detection micrometeor of interior 10ml per hour；And simple in construction, detection is accurate, precision is high；Further, compare
In prior art, detector provided by the present invention not only can detect the changes in flow rate of forward, and can detect reverse stream
Amount change, and prior art can only detect the changes in flow rate on a direction.Disclosure is particularly well suited to need accurately to control to mix
Close the occasion of each gas concentration in gas to use, such as medical field.
Accompanying drawing explanation
Fig. 1 is the schematic perspective view of embodiment of the present invention assembling structure；
Fig. 2 is the schematic perspective view (eliminating water bath) of embodiment of the present invention assembling structure；
Fig. 3 is the floor map of embodiment of the present invention assembling structure；
Fig. 4 to Fig. 7 is the top perspective view of C portion in Fig. 3；
Fig. 8 is the floor map after water bath of the present invention decomposes with other parts；
Fig. 9 is conduction fluid column, conductor wire and the annexation figure of control chip in the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
As shown in Figures 1 to 9, this mixed gas flow detector includes water bath 9 and is immersed in water bath 9
Other parts.These other parts include the many snorkels for carrying each gas to be mixed, and the present embodiment is two
Root, respectively oxygen channel A1 and air line B1；By connecting rod 8 between oxygen channel A1 and air line B1
It is located by connecting together.Multiple fixture block A14, quilt on air line it is additionally provided with on oxygen channel A1 and air line B1
Block not shown, accordingly, water bath 9 is provided with multiple draw-in groove (not shown), by fixture block and draw-in groove
Coordinate these other position components in water bath 9.The quantity of snorkel can the most specifically set, it is possible to
Think more parallel connections.
Oxygen channel A1 is provided with the first check valve A12 preventing air-flow reverse flow.It is also connected with on oxygen channel A1
There is the first bypass duct A3 and the second bypass duct A4.
Wherein, the first bypass duct A3 includes horizontally disposed horizontal tube A31 and is connected to horizontal tube A31 two
The first vertical pipeline A32 and the second vertical pipeline A33 of end, the outlet of first, second vertical pipeline A32, A33 is equal
It is respectively equipped with second switch valve A34 and the 3rd switch on connection air, and first, second vertical pipeline A32, A33
Valve A35.Being also associated with the first connection pipeline A36 on first vertical pipeline A32, this first entrance connecting pipeline connects
Oxygen channel A1 is also positioned at the upstream of the first check valve A12；First connects pipeline A36 is provided with switch valve A11, should
Switch valve A11 is positioned at upstream and the downstream of the second bypass duct A4 of the first bypass duct A3.
The middle part of horizontal tube A31 is provided with conduction fluid column A37, is provided with resistance unit and (does not shows in figure in the first bypass duct A3
Go out), this resistance unit runs through horizontal tube A31, and this resistance unit connects control chip.In the present embodiment control chip and
Liquid crystal display is arranged at controlling on box A5.
As it is shown in figure 5, the resistance unit in the present embodiment is the wire that two symmetries are embedded in the first bypass duct A3,
Between the diameter 0.4-2mm of wire, in order to reduce resistance unit to the impact of adhesive force, this electricity between conduction fluid column and tube wall
Resistor cross-section parts embeds in the inwall of the first bypass duct, and the degree of depth embedded in the present embodiment is this diameter of wire
60%-80%, remainder exposes to inner-walls of duct.This structure both can guarantee that conductive liquid post was under its own face tension force effect
Reunite, also be able to the good contact ensureing conduction fluid column with resistance unit simultaneously.
Resistance unit can also is that the structure shown in Fig. 4 and Fig. 6 to Fig. 8.
Also being to use two wires in structure as shown in Figure 4, these two Wire sticks are against the medial surface of the first bypass duct
Location.Resistance unit as shown in Figure 6 is flat arc platy structure, and this arc part is embedded at the first bypass duct
Medial wall in, part exposes to the medial wall of the first bypass duct.Resistance unit as shown in Figure 8 is also to use arc
Shape structure, but this arc is all embedded on the medial wall of the first bypass duct, its surface and the first bypass duct
Medial wall forms the inner chamber of the first bypass duct together.
The resistance unit of arc platy structure is on the basis of the resistance unit of conductor structure, and it is more steady with the connection of conduction fluid column
Gu, and the surface tension of conduction fluid column self will not be destroyed completely.
One end of resistance unit is all connected with control chip, between conduction fluid column A37, resistance unit A10 and control chip A5
Forming closed-loop path, along with the movement of conduction fluid column A37, the resistance of this closed-loop path produces change, the change of this resistance
Value is transmitted to control chip, by the computing of control chip, obtains the change of flow, result of calculation is shown over the display
Illustrate.
Second bypass duct A4 is provided with effusion meter A6, the entrance of the second bypass duct and the outlet of the first bypass duct
Connect first port of pneumatic type three-way control valve A7 and the second port respectively, the of this pneumatic type three-way control valve A7
Three ports by second connection pipeline A38 connect blender 2, and second connect pipeline A38 be provided with control gas by
Blender 2 flows to the second check valve A39 of the second bypass duct A3；The outlet first of the second bypass duct A3
Connect pipeline A36.
Air line B1 and parts connected thereto are identical with oxygen channel A1.Which is provided with restriction gas flow to mix
First check valve B12 of clutch 2.The first bypass duct B3 and the second bypass duct it is also associated with on oxygen channel B1
B4。
Wherein, the first bypass duct B3 includes horizontally disposed horizontal tube B31 and is connected to horizontal tube B31 two ends
The first vertical pipeline B32 and the second vertical pipeline B33, the outlet of first, second vertical pipeline B32, A33 all connects
It is respectively equipped with second switch valve B34 and the 3rd switch valve on logical air, and first, second vertical pipeline B32, B33
B35.Being also associated with the first connection pipeline B36 on first vertical pipeline B32, this first entrance connecting pipeline connects oxygen
Feed channel B11 is also positioned at the upstream of the first check valve B12；First connects pipeline B36 is provided with switch valve B11, should
Switch valve B11 is positioned at upstream and the downstream of the second bypass duct B4 of the first bypass duct B3.
The middle part of horizontal tube B31 is provided with conduction fluid column B37, is provided with resistance unit B10, this electricity in the first bypass duct B3
Resistor runs through horizontal tube B31, and this resistance unit B10 connects control chip.Control chip and liquid crystal in the present embodiment
Show that device is arranged at controlling on box B5.
As it is shown in figure 5, the resistance unit in the present embodiment is the wire that two symmetries are embedded in the first bypass duct B3,
Between the diameter 0.4-2mm of wire, in order to reduce resistance unit to the impact of adhesive force, this electricity between conduction fluid column and tube wall
Resistor cross-section parts embeds in the inwall of the first bypass duct, and the degree of depth embedded in the present embodiment is this diameter of wire
60%-80%, remainder exposes to inner-walls of duct.
Second bypass duct B4 is provided with effusion meter B6, the entrance of the second bypass duct and the outlet of the first bypass duct
Connect first port of pneumatic type three-way control valve B7 and the second port respectively, the of this pneumatic type three-way control valve B7
Three ports by second connection pipeline B38 connect blender 2, and second connect pipeline B38 be provided with control gas by
Blender 2 flows to the second check valve B39 of the second bypass duct B3；The outlet first of the second bypass duct B3 is even
Adapter road B36.
The present embodiment is provided with single control chip and liquid crystal display on oxygen channel A1 and air line B1,
These air ducts can also share same control chip and display.
In the present embodiment, the caliber of the first bypass A3 is 6mm, and conduction fluid column B37 is hydrargyrum, the length of conduction fluid column
Degree is 8mm.Pressure gauge A13, B13 also it is respectively provided with on oxygen channel A1 and air line B1.
The operation principle of this micrometeor detector is described as follows:
Oxygen sends into oxygen channel A1, enters blender 2 with PA pressure；Air is pressed with PB via air line B1
Power enters blender 2, PB=PA, and both can only flow to mixing under the restriction of respective check valve A12, B12
Device 2, delivers to downstream after mixing in blender.
When needing the flowed fluctuation monitoring gas to be mixed, open switch valve A11, B11, now by respective first even
Adapter road A36, B36 enter respective first bypass duct A3, B3.When pressure is constant, when i.e. flow is without fluctuation,
The air pressure of conduction fluid column A37, B37 both sides is equal, and conduction fluid column is stable motionless at the middle part of horizontal tube A31, B31,
The closed-loop path that resistance unit is formed with conductive liquid post is unchanged, i.e. the resistance of this closed-loop path is unchanged, control chip and aobvious
Show that device is without fluctuation display.
When the air-flow in oxygen channel A1 or air line B1 changes, cause entering the air-flow in blender 2
Amount is uneven with the throughput of blender discharge, makes the air pressure in blender 2 change, thus breaks conduction fluid column two
The air pressure balance of side, conduction fluid column moves under the promotion of air pressure, causes conduction fluid column to be sent out with the loop that resistance unit is formed
Changing, so that this loop effective resistance value change.This change is transmitted to control chip, and control chip is according to setting in advance
Fixed program calculates, and obtains the changing value of air flow rate.Owing to the caliber of conduction fluid column and the first bypass is limited to spy
In fixed scope, therefore, the flowed fluctuation of the trace of as little as 10ml/h, can result in the movement of conduction fluid column, make
The resistance of resistance unit changes, thus is detected.
When flowed fluctuation is bigger, pneumatic type three-way control valve is according to the pressure detected or the changing value of flow, pneumatic type
Three-way control valve opens the valve corresponding with the second bypass duct, and substantial amounts of air-flow returns via the second bypass duct, no
The first bypass duct can be entered into, the use safety of this micrometeor detector has been effectively ensured.Meanwhile, by being arranged on
Effusion meter on two bypass ducts can read out the changing value of this big flow conveniently and efficiently.
Claims (5)
1. a mixed gas flow detector, it is characterised in that include supplying gas for carry each gas to be mixed many
Pipe, each snorkel is equipped with the first check valve limiting gas flow blender；
The first bypass duct and the second bypass duct it is connected on each described snorkel；
Wherein, described first bypass duct includes horizontally disposed horizontal tube and be connected to horizontal tube two ends first is erected
Straight pipeline and the second vertical pipeline, the outlet of described first, second vertical pipeline all connects air, and first, second
Second switch valve and the 3rd switch valve it is respectively equipped with on vertical pipeline；Described first vertical pipeline connects the first connecting tube
Road, this first entrance connecting pipeline connects described snorkel and is positioned at the upstream of described first check valve；Described horizontal tube
Middle part be provided with conduction fluid column, be provided with resistance unit in described first bypass duct, this resistance unit runs through described horizontal tube, and
And this resistance unit connects control chip；
Described second bypass duct is provided with effusion meter, the entrance of described second bypass duct and described first bypass duct
Outlet connects the first port and the second port, the 3rd end of this pneumatic type three-way control valve of pneumatic type three-way control valve respectively
Mouth is by blender described in the second connection pipeline communication, and described second connection pipeline is provided with control gas and is mixed by described
Clutch flows to the second check valve of described second bypass duct；
Described in the outlet of described second bypass duct, first connects pipeline.
Mixed gas flow detector the most according to claim 1, it is characterised in that logical between each described snorkel
Cross connecting rod connection to be located by connecting together.
Mixed gas flow detector the most according to claim 1 and 2, it is characterised in that this mixed gas flow
Detector also includes water bath, and other parts are submerged in the water-bath of this water bath.
Mixed gas flow detector the most according to claim 3, it is characterised in that described first connects on pipeline
Being additionally provided with switch valve, this switch valve is positioned at upstream and the downstream of the second bypass duct of described first bypass duct.
Mixed gas flow detector the most according to claim 4, it is characterised in that the caliber of described first bypass
For 4-8mm, a length of 5-10mm of described conduction fluid column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410110713.3A CN103852115B (en) | 2014-03-24 | 2014-03-24 | A kind of mixed gas flow detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410110713.3A CN103852115B (en) | 2014-03-24 | 2014-03-24 | A kind of mixed gas flow detector |
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| Publication Number | Publication Date |
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| CN103852115A CN103852115A (en) | 2014-06-11 |
| CN103852115B true CN103852115B (en) | 2016-08-17 |
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| CN201410110713.3A Active CN103852115B (en) | 2014-03-24 | 2014-03-24 | A kind of mixed gas flow detector |
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2014
- 2014-03-24 CN CN201410110713.3A patent/CN103852115B/en active Active
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|---|---|---|---|---|
| WO2005123236A1 (en) * | 2004-06-22 | 2005-12-29 | Tokyo Electron Limited | Substrate processing device |
| CN101241093A (en) * | 2007-02-07 | 2008-08-13 | 中国科学院微电子研究所 | Gas-sensitive sensor calibration and reliability testing system |
| CN102094130A (en) * | 2009-12-11 | 2011-06-15 | 上海航天精密机械研究所 | Magnesium alloy smelting protecting gas and method |
| CN102495110A (en) * | 2011-11-18 | 2012-06-13 | 南京工业大学 | Gas sensor test system |
| CN202734516U (en) * | 2012-08-16 | 2013-02-13 | 南京科达新控仪表有限公司 | Feedforward type atmosphere control system for bell jar furnace |
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| CN103852115A (en) | 2014-06-11 |
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