CN108175412A - A kind of hood type indirect energy test method and device - Google Patents
A kind of hood type indirect energy test method and device Download PDFInfo
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- CN108175412A CN108175412A CN201711384501.4A CN201711384501A CN108175412A CN 108175412 A CN108175412 A CN 108175412A CN 201711384501 A CN201711384501 A CN 201711384501A CN 108175412 A CN108175412 A CN 108175412A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
- A61B5/083—Measuring rate of metabolism by using breath test, e.g. measuring rate of oxygen consumption
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
- A61B5/083—Measuring rate of metabolism by using breath test, e.g. measuring rate of oxygen consumption
- A61B5/0833—Measuring rate of oxygen consumption
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
- A61B5/083—Measuring rate of metabolism by using breath test, e.g. measuring rate of oxygen consumption
- A61B5/0836—Measuring rate of CO2 production
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Abstract
The invention discloses a kind of hood type indirect energy test method and device, available for simple, the accurate measurement to human energy metabolism rate.In the present invention characteristics of contaminated respiratory droplets gas is collected and surveyed with negative pressure head-shield, so that it need not consider mask and physiologic dead space error correction when calculating relative metabolic rate, it need not consider to postpone check and correction between flow velocity and concentration, simplify test data analysis computation complexity, improve the precision of measurement；By the structure for designing negative pressure head-shield and corresponding adaptive speed of evacuation adjustment algorithm, concentration dilution ratio is reduced；A kind of pressure relief device is additionally used simultaneously, and pressure differential between balance calibration gas and measurement gas improves measurement result accuracy.The present invention can be used for human body rest energy expenditure to measure, and have the advantages that comfortable, safety, high certainty of measurement.
Description
Technical field
The present invention relates to gas sample collection analysis fields, and in particular to a kind of hood type indirect energy test method and dress
It puts.
Background technology
Gaseous metabolism analytical instrument is by testing zmount of oxygen consumption in certain time, carbon dioxide yield calculates human body
The composition of energy expenditure and three major nutrient (carbohydrate, fat and protein) in energy expenditure, for nutrition
Metabolic evaluation.In addition the device can also coordinate with load equipments such as treadmill, Power Vehicles, and test human body is under different motion load
Oxygen uptake, carbon dioxide output, for evaluator body-centered lung endurance test and cardiopulmonary circulatory system disease non-invasive diagnosis.Cause
This gaseous metabolism test has important application value in nutritive diet guiding, medical diagnosis on disease and rehabilitation field.
The gaseous metabolism test and comparison of early stage is simple, generally uses douglas bag method.It is exhaled in test process by all
Go out gas to be all collected into airbag, entire test process needs tens airbags.After the completion of test, exhaled gas is first measured
Volume, reuses the concentration of oxygen and carbon dioxide in chemical analysis method analysis airbag, and whole process is slow and cumbersome.By
It cannot accomplish the real-time analysis of data, while equipment is huge in douglas bag method, vent line is enclosed, resistance of exhaling
Power is very big.Miniature mixing chamber method acquires micro characteristics of contaminated respiratory droplets gas and is analyzed, miniature mixing chamber and douglas bag method
It compares, its biggest advantage is that can be measured under open breathing pattern, but influenced by sampling error and respiration dead space,
Its accuracy is still to be improved.
Hood type indirect energy test method is a kind of open energetic supersession test method, relative to closed type energy generation
Thank to test, test process subject can free breathing environment air, without the resistance of ducting, therefore test process is more comfortable,
More hommization；Hood type energetic supersession test sample negative pressure head-shield collector's body exhaled gas, utilizes nitrogen balance analysis meter
It calculates, does not need to the error correction of related ventilation dead space, in addition different from characteristics of contaminated respiratory droplets gas flow rate real-time change, head-shield pumping speed
Spend constant, the analysis of gas concentration in head-shield does not need to be associated with flow velocity, that is, does not need to the reflection of amendment flow velocity, concentration sensor
Delay, therefore measurement result is more accurately and reliably.
Invention content
The purpose of the present invention is by proposing a kind of novel head bell-type indirect energy test method and device, improve test
Person's comfort level during the test and safety.It realizes and characteristics of contaminated respiratory droplets gas is more accurately measured.
In order to achieve the above object, scheme of the present invention is：
A kind of hood type indirect energy test device, the device is by head-shield, flow sensor, damper, the first aspiration pump
The gas collecting mixing portion of composition realizes the acquisition of characteristics of contaminated respiratory droplets gas and air composition mixed gas with mixing, wherein the
One aspiration pump, damper, flow sensor, head-shield bleeding point are connected according to this by tracheae, and the first aspiration pump is extracted through the access
Characteristics of contaminated respiratory droplets gas in head-shield, is finally rejected in air, and for stablizing pumping airflow, flow sensor is used to be evacuated damper
Flow velocity measures；It is made of the first gas cylinder, the second gas cylinder, four-way valve, lambda sensor, carbon dioxide sensor, the second aspiration pump
Gas concentration analysis part realizes gas concentration analysis, the wherein gas between four-way valve B ends connection damper and flow sensor
Pipe, for extracting the gas in tracheae, connection surrounding air in four-way valve A ends is highly concentrated in the first gas cylinder for extracting environmental gas
Scale determines gas and is connected to spilling interface through the first two stage pressure reducing valves, the first solenoid valve according to this by conduit, low concentration in the second gas cylinder
Calibration gas is connected to by conduit through the second two stage pressure reducing valves, second solenoid valve according to this overflows interface one end, overfall other end warp
Pressure maintaining valve is connected to four-way valve D ends, and four-way valve may be selected to open any access of A-C, B-C, D-C, the second aspiration pump connection buffering
Device, while extract four-way valve C-terminal gas through lambda sensor and carbon dioxide sensor；It is responsible in detection device by control unit
Pump and the control of valve, the acquisition of data and upload；Human-computer interaction device is used for data processing, analysis and display.
Wherein, human body exhaled gas is collected by the transparent head-shield of a fractional open, the mask is by including a use
Soft surrounding edge, an air inlet and a bleeding point in sealing when test is evacuated, form negative pressure, air inlet inside head-shield
Convection current is formed between mouth and gas outlet, people's exhaled gas is pumped into pipeline of fans.
Wherein, when being demarcated to lambda sensor and carbon dioxide sensor, first by the high pressure marked gas in gas cylinder
Pressure release is carried out, then marked gas is pumped by lambda sensor and carbon dioxide sensing by the second aspiration pump by overflowing interface
Device carries out concentration calibration.
A kind of hood type indirect energy test method, when testing beginning, the concentration for analyzing carbon dioxide in head-shield comes from
Adapt to the speed of evacuation of the first aspiration pump of adjustment, the speed of the first aspiration pump is divided into several gears, and when starting presets according to weight
The speed of evacuation gear of first aspiration pump analyzed thereafter the minimum of gas concentration lwevel in head-shield in the respiratory cycle every 50 seconds
Value and maximum value, and with preset threshold value comparison, adjust wind turbine gear, after threshold condition meets, the speed of evacuation gear holding
It is constant.
A kind of hood type indirect energy test method, step are as follows：
Step 1：Valve in the front opening four-way valve D-C directions of subject's test closes the valve in remaining direction of four-way valve
The valve of door, the calibration of advanced line sensor hight-concentration parts, the first gas cylinder of opening and the first two stage pressure reducing valves, wherein the first gas
For bottle for high concentration gas cylinder, the second aspiration pump extracts gas with constant speed, in the first gas cylinder marked gas by overflowing interface,
A part enters lambda sensor and carbon dioxide sensor by pressure maintaining valve, to lambda sensor and carbon dioxide sensor into rower
Fixed, another part is arranged into air, and after a period of time, lambda sensor and the calibration of carbon dioxide sensor hight-concentration parts terminate,
The first solenoid valve is closed, followed by the calibration of sensor low concentration part, opens the second gas cylinder and the second two stage pressure reducing valves
Valve, the second gas cylinder is low concentration gas cylinder, and the second aspiration pump extracts gas with constant speed, marked gas in the second gas cylinder
By overflowing interface, a part enters lambda sensor and carbon dioxide sensor by pressure maintaining valve, to lambda sensor and titanium dioxide
Carbon sensor is demarcated, and another part is arranged into air, after a period of time, lambda sensor and carbon dioxide sensor low concentration
Part calibration terminates, and closes second solenoid valve；
Step 2：Open the valve in four-way valve A-C directions, close the valve in remaining direction of four-way valve, the second aspiration pump with
Air in test environment is pumped to lambda sensor and carbon dioxide sensor by constant speed, and lambda sensor and carbon dioxide pass
Sensor measures in a period of time average oxygen concentration and average gas concentration lwevel in air；
Step 3：Subject registers in the enterprising row information of human-computer interaction device, and after completing registration, tester helps tested
Person takes head-shield and informs the points for attention in subject's measurement process, allows or so subject's rest half an hour so as into meditation
Breath state；
Step 4：The valve in four-way valve B-C directions is opened, closes the valve in remaining direction of four-way valve, clicks start button,
It measures beginning wind turbine to start to be evacuated according to budget speed, negative pressure is formed in head-shield, sucks the environmental gas and characteristics of contaminated respiratory droplets of head-shield
Metabolism gas by together suck exhaust pipe in, at this time according to gas concentration lwevel, every the speed of evacuation meeting of 50 seconds wind turbines
Adaptive adjustment, after the gas concentration lwevel requirement for reaching setting, the first aspiration pump extracts gas with constant gear speed, takes out
The mixed gas gone out enters flow sensor, and flow sensor measures the flow of mixed gas, and control unit passes through flow sensing
Device acquires gas flow data, and the second aspiration pump is with constant speed to the gas sample in pipeline, a part of gaseous mixture of sampling
Body enters gas concentration analysis part, and gas concentration analysis part obtains gas real-time concentration data in pipeline；
Step 5：Human-computer interaction device according to control unit acquisition upload data, extrapolate oxygen uptake in a period of time,
Carbon dioxide output calculates that process is as follows：
Discharge the mixed gas volume of head-shield：
Discharge nitrogen gas concn in the mixed gas of head-shield：FEN2=1-FECO2–FEO2
Nitrogen gas concn in surrounding air：FIN2=1-FICO2–FIO2
It is pumped into head-shield hollow gas product：Vin=Vout×FEN2/FIN2
Oxygen uptake：VO2=Vin×FEO2-Vout×FIO2
Carbon dioxide output：VCO2=Vout×FICO2-Vin×FECO2
Wherein：V (t) is mixed gas instantaneous velocity in exhaust pipe；t1The time point started for sampling；t2It is tied for sampling
The time point of beam；FECO2Average gas concentration lwevel in mixed gas to discharge head-shield；FEO2To discharge the mixed gas of head-shield
Middle average oxygen concentration；FIO2To be pumped into average oxygen concentration in air；FICO2To be pumped into average gas concentration lwevel in air.
The advantageous effect that the present invention obtains：
1st, a kind of hood type indirect energy test method of the present invention, test process subject do not need to wear mask, exhalation
Gas will not be revealed, while not need to the relevant dead space amendment of mask, and another test process can freely have a breath of fresh air, therefore be
A kind of simple and convenient, accurate indirect energy metabolism test method.
2nd, a kind of hood type indirect energy test method of the present invention, when starting test, every 50 seconds adjustment primary air fan speed
Degree, when gas concentration lwevel reaches preset concentration range, speed of evacuation gear no longer changes, i.e., in follow-up test process wind turbine
The speed of evacuation is kept constant, therefore when calculating human body oxygen uptake and CO2 emissions, is not needed to flow velocity and be aligned with concentration, i.e.,
Without the delay time between corrected flow rate and concentration analysis, calculating process is simple, accurate.
3rd, by designing the shape of head-shield and gas inlet and outlet position, in pumping process is measured, make air from number of people top
Air inlet enters, and after characteristics of contaminated respiratory droplets gas mixing, is inhaled into nasal downside exhaust pipe 16, and the air-flow and people for being evacuated formation breathe out
Airflow direction is identical, improves pumping efficiency, reduces the dilution ratio of gas concentration, the final precision for improving concentration analysis.
When the 4th, to transducer calibration, the positive pressure of marked gas in interface release gas tank is overflowed using pressure, in this way
Pressure adjustment comes, equal with pressure in lambda sensor 10 during test and carbon dioxide sensor 11 when keeping demarcating, and eliminates biography
Error caused by unified test examination pressure process compensation improves the accuracy of gas concentration measurement.
5. the concentration of carbon dioxide in analysis head-shield 18 before testing, is first passed through to determine the pumping of the first aspiration pump 14 speed
Degree realizes the gas that the first aspiration pump 14 breathes out subject under the minimum speed of evacuation and extracts analysis completely, on the one hand anti-
Stop that the speed of evacuation is too small to be made in head-shield 18 carbon dioxide repeatedly accumulation causes carbon dioxide to overflow, influenced the accurate of measurement result
Property, while prevent human body from sucking high carbon dioxide and cause discomfort；On the one hand in the case where sensor accuracy is limited, it is therefore prevented that
The speed of evacuation is excessive to cause characteristics of contaminated respiratory droplets gas excessively to be diluted by air, the oxygen gas concentration lwevel that sensor is caused to detect
It is too low, influence Concentration Testing precision.
Description of the drawings
Fig. 1 is a kind of structure diagram of hood type indirect energy test device of the present invention.
Fig. 2 is a kind of work flow diagram of hood type indirect energy test device of the present invention.
Fig. 3 is that interface structure schematic diagram is overflowed in the present invention.
Fig. 4 is the hood structure schematic diagram that human body gas collection is used in the present invention.
Fig. 5 is characteristics of contaminated respiratory droplets gas carbon dioxide concentration change curve in the present invention.
Fig. 6 is 14 wind speed adaptive regulation method flow chart of the first aspiration pump in the present invention.
In figure：1st, the first gas cylinder；2nd, the second gas cylinder；3rd, the first two stage pressure reducing valves；4th, the second two stage pressure reducing valves；5th, the first electricity
Magnet valve；6th, second solenoid valve；7th, interface is overflowed；8th, pressure maintaining valve；9th, four-way valve；10th, lambda sensor；11st, carbon dioxide sensor；
12nd, buffer unit；13rd, the second aspiration pump；14th, the first aspiration pump；15th, damper；16th, pump-line；17th, flow sensor；
18th, head-shield.
Specific embodiment
A kind of hood type indirect energy test device of specific embodiments of the present invention as shown in Figure 1, including：First gas cylinder
1st, the second gas cylinder 2, the first two stage pressure reducing valves 3, the second two stage pressure reducing valves 4, the first solenoid valve 5, second solenoid valve 6, spilling interface
7th, pressure maintaining valve 8, four-way valve 9, lambda sensor 10, carbon dioxide sensor 11, buffer unit 12, the second aspiration pump 13, first are taken out
Air pump 14, damper 15, pump-line 16, flow sensor 17 and head-shield 18.
By head-shield 18, flow sensor 17, damper 15, the first aspiration pump in a kind of hood type indirect energy test device
The gas collecting mixing portion of 14 compositions realizes the acquisition of characteristics of contaminated respiratory droplets gas and air composition mixed gas with mixing, wherein
First aspiration pump 14, damper 15, flow sensor 17,18 bleeding point of head-shield are connected according to this by tracheae, the first aspiration pump 14
Characteristics of contaminated respiratory droplets gas in head-shield is extracted through the access, is finally rejected in air, damper 15 is used to stablize pumping airflow, flow
Sensor 17 measures for being evacuated flow velocity；It is passed by the first gas cylinder 1, the second gas cylinder 2, four-way valve 9, lambda sensor 10, carbon dioxide
The gas concentration analysis part that sensor 11, the second aspiration pump 13 form realizes gas concentration analysis, wherein the B ends of four-way valve 9
Tracheae between connection damper 15 and flow sensor 17, for extracting the gas in tracheae, the A ends connection environment of four-way valve 9
Air, for extracting environmental gas, 1 high concentration of the first gas cylinder demarcates gas by conduit according to this through first the 3, first electricity of two stage pressure reducing valves
Magnet valve 5, which is connected to, overflows interface 7, and 2 low concentration of the second gas cylinder demarcates gas by conduit according to this through second the 4, second electricity of two stage pressure reducing valves
Magnet valve 6, which is connected to, overflows 7 one end of interface, and the overfall other end is connected to the D ends of four-way valve 9 through pressure maintaining valve 8, and four-way valve 9 is optional
It selects and opens any access of A-C, B-C, D-C, the second aspiration pump 13 connection buffer unit 12, while through lambda sensor 10 and titanium dioxide
Carbon sensor 11 extracts the C-terminal gas of four-way valve 9；The control of pump and valve is responsible in detection device by control unit, data are adopted
Collection and upload；Human-computer interaction device is used for data processing, analysis and display.
A kind of characteristics of contaminated respiratory droplets gas collecting device workflow of hood type of the present invention is as shown in Fig. 2, specific as follows：
Step 1：As shown in Figure 1, the valve in the D-C directions of the front opening four-way valve 9 of subject's test, closes four-way
The valve in 9 remaining direction of valve.The calibration of advanced line sensor hight-concentration parts.It opens and is so incensed that the first gas cylinder comprising high concentration calibration
1 and first two stage pressure reducing valves 3 valve.Second aspiration pump 13 extracts gas with constant speed.Marked gas in first gas cylinder 1
By overflowing interface 7, a part enters lambda sensor 10 and carbon dioxide sensor 11 by pressure maintaining valve, to 10 He of lambda sensor
Carbon dioxide sensor 11 is demarcated, and another part is arranged into air.After a period of time, lambda sensor 10 and carbon dioxide pass
The calibration of 11 hight-concentration parts of sensor terminates, and closes the first solenoid valve 5.Followed by the calibration of sensor low concentration part.It beats
Open the valve of the second gas cylinder 2 comprising low concentration calibration gas and the second two stage pressure reducing valves 4.Second aspiration pump 13 is with constant speed
Extract gas.Marked gas enters lambda sensor 10 and two by overflowing interface 7, a part by pressure maintaining valve in second gas cylinder 2
Carbon sensor 11 is aoxidized, lambda sensor 10 and carbon dioxide sensor 11 are demarcated, another part is arranged into air.One section
After time, lambda sensor 10 and the calibration of 11 low concentration part of carbon dioxide sensor terminate, and close second solenoid valve 6.
Step 2：The valve in four-way valve 9A-C directions is opened, closes the valve in 9 remaining direction of four-way valve.Second aspiration pump
Air in test environment is pumped to lambda sensor 10 and carbon dioxide sensor 11,10 He of lambda sensor by 13 with constant speed
Carbon dioxide sensor 11 measures in a period of time average oxygen concentration and average gas concentration lwevel in air.
Step 3：Subject is in the enterprising row information registration of human-computer interaction device.After completing registration, tester helps tested
Person takes head-shield 18 and informs the points for attention in subject's measurement process.Or so subject's rest half an hour is allowed to enter
Quiescent condition.
Step 4：The valve in four-way valve 9B-C directions is opened, closes the valve in 9 remaining direction of four-way valve.Click start by
Button measures beginning wind turbine and starts to be evacuated according to budget speed, forms negative pressure in head-shield 18, suck the environmental gas and human body of head-shield
The metabolism gas of exhalation is sucked in exhaust pipe 16 together.At this time according to gas concentration lwevel, every the pumping of 50 seconds wind turbines
Speed can be adjusted adaptively, and after the gas concentration lwevel requirement for reaching setting, the first aspiration pump 14 is taken out with constant gear speed
Take gas.The mixed gas of extraction enters flow sensor 17, and flow sensor 17 measures the flow of mixed gas.Control unit
Gas flow data is acquired by flow sensor 17.Second aspiration pump 13 is with constant speed to the gas sample in pipeline 16.
A part of mixed gas of sampling enters gas concentration analysis part, and it is dense in real time that gas concentration analysis part obtains gas in pipeline
Degrees of data.
Step 5：Human-computer interaction device according to control unit acquisition upload data, extrapolate oxygen uptake in a period of time,
Carbon dioxide output calculates that process is as follows：
Discharge the mixed gas volume of head-shield：
Discharge nitrogen gas concn in the mixed gas of head-shield：FEN2=1-FECO2-FEO2
Nitrogen gas concn in surrounding air：FIN2=1-FICO2-FIO2
It is pumped into head-shield hollow gas product：Vin=Vout×FEN2/FIN2
Oxygen uptake：VO2=Vin×FEO2-Vout×FIO2
Carbon dioxide output：VCO2=Vout×FICO2-Vin×FECO2。
Wherein：V (t) is mixed gas instantaneous velocity in exhaust pipe 16；t1The time point started for sampling；t2For sampling
The time point of end；FECO2Average gas concentration lwevel in mixed gas to discharge head-shield；FEO2To discharge the gaseous mixture of head-shield
Average oxygen concentration in body；FIO2To be pumped into average oxygen concentration in air；FICO2It is dense to be pumped into average carbon dioxide in air
Degree.
Human-computer interaction device shows measurement result.
In step 1：The lambda sensor 10 used in the present apparatus be electrochemical transducer[sensor, carbon dioxide sensor 11
Quick analyte sensors are belonged to for infrared sensor.Reaction is very sensitive, generally sensitive, even right to flow velocity, pressure, temperature
Gas component is sensitive.The second aspiration pump 13 is that gas is acquired from pump-line 16 during due to test, and gas atmosphere is near in pipeline
Atmospheric pressure is similar to, in order to ensure that the pressure for marking timing acquiring gas is equal with the pressure that gas is acquired during test, during calibration, first
It opens gas cylinder and reduces air pressure by two stage pressure reducing valves, after marked gas is by overflowing interface 7, as shown in Figure 3.Air pressure is further dropped
It is low, it is similar to atmospheric pressure, the pressure for marking timing acquiring gas in this way is equal with the pressure that gas is acquired during test, is approximately equal to big
Air pressure.The overflow pipe length that spill valve 7 is connected with air is more than 20cm, and to ensure to flow into the marked gas amount of spill valve 7
It is more than, is extracted the gas flow of spill valve 7, arranging marked gas flow velocity into air from overflow pipe, to be more than 250ML per minute,
Prevention air is diffused into calibration gas.The negative pressure generated during Demarcate Gas and gasmetry by the second aspiration pump 13
Extract gas.In this way, error caused by eliminating the compensation of traditional test pressure process, improves the accurate of gas concentration measurement
Property.
A kind of characteristics of contaminated respiratory droplets gas collecting device of hood type of the present invention, the head-shield used is as shown in figure 4, according to head-shield
Large, medium and small three kinds of internal capacity point, volume is respectively 10L, 20L, 35L or so, is respectively used to weight 10kg~20kg, 20kg
~40kg, more than 40kg subjects test, and bleeding point is located at nose gas outlet lower section during test, and exhaust fan amount is usually that human body is exhaled
Go out the several times of gas flow, therefore negative pressure can be formed in head-shield, neck periphery open portion is wrapped up with soft material and covered, and is allowed big
Portion gas forms gaseous exchange, it is therefore an objective to it is desirable that passing through the relatively low speed of evacuation from the air inlet inflow positioned at the human body crown
Characteristics of contaminated respiratory droplets gas is pumped into pipeline 16 as early as possible.Head-shield 18 generally with transparent acrylic material make, on the one hand can observe by
The state of examination person provides the safety of test process, and one side subject, which does not think, yet to constrain and boring, more hommization.
A kind of characteristics of contaminated respiratory droplets gas collecting device of hood type of the present invention, the fan speed used in step 4 are self-adaptive controlled
Algorithm processed is as follows：
It is illustrated in figure 5 the variation of characteristics of contaminated respiratory droplets carbon dioxide in gas concentration, the reality that carbon dioxide sensor 11 obtains
When a concentration of pipeline 16 in gas concentration, be characteristics of contaminated respiratory droplets gas concentration and sucking air mixing result.Gas in pipeline
Concentration profile changes with the speed of evacuation, shows as：The speed of evacuation is faster, and the flow that air enters head-shield is bigger, is exhaled with human body
After inhaling gas mixing, carbon dioxide in gas mixture maximum concentration is smaller, while carbon dioxide concentration value variation range, that is, concentration
Peak-to-peak value is smaller.On the contrary, the speed of evacuation is smaller, it is smaller that air enters head-shield flow, carbon dioxide in gas mixture maximum concentration
It is also bigger with concentration signal peak-to-peak value.
Gas concentration situation has certain influence to metabolic measurements testee comfort level and measurement accuracy etc. in head-shield.One
Aspect if gas concentration lwevel is higher in head-shield (more than 1%), causes gas concentration lwevel in blood to increase, higher blood
Liquid gas concentration lwevel stimulates human body maincenter and the chemocepter of periphery, promotes respiratory center excited, and then breathing is caused to be exerted
Power increases, i.e., exaggerated respiration, quickening, testee's comfort level reduce, and energy expenditure is consequently increased.In addition, dioxy in head-shield
It is higher to change concentration of carbon, increases in head-shield with ambient carbon dioxide concentration difference, this puies forward the leakproofness of head-shield and human body contact portion
Higher requirement is gone out.On the other hand, if the speed of evacuation is too fast, gas concentration lwevel signal peak value is relatively low (such as in head-shield
Less than 0.5%), then concentration signal signal-to-noise ratio reduces, and measurement accuracy declines.
According to above-mentioned analysis, to coordinate the comfort and accuracy of metabolism test, dynamic is needed to adjust the speed of evacuation with will
Gas concentration lwevel needs to control in a certain range, and control targe is：
(1) average gas concentration lwevel peak value≤1%；
(2) average gas concentration lwevel signal peak value >=0.5%
Fan speed ranging from 0 to 60L it is per minute, wherein increase a gear speed increase 5L it is per minute, start test when,
The initial velocity setting of wind turbine is to input weight information according to human body to calculate, general weight is every for 10L below weight 10kg
Minute, 10kg~20kg is per minute for 20L, and more than 20kg is per minute for 35L, after fan speed setting, sentences into fan speed
Stop journey, and after 30 seconds uniform flows, gas concentration lwevel is waited for stablize first, acquisition obtains the average carbon dioxide in 20 seconds below
Then peak concentration and average gas concentration lwevel signal peak value judge that average gas concentration lwevel peak value is more than 1%, are more than
Then increase by one grade of fan speed, reenter fan speed and judge flow, if judging average gas concentration lwevel again no more than 1%
Whether signal peak value is less than 0.5%, less than then reducing by one grade of fan speed, reenters fan speed and judges flow, not small
In 0.5%, then illustrate changes of concentrations of carbon dioxide range in the range of control targe, the speed of evacuation kept constant is no longer adjusted
It is whole, terminate until testing, as shown in Figure 6.
Claims (5)
1. a kind of hood type indirect energy test device, it is characterised in that：The device by head-shield (18), flow sensor (17),
The gas collecting mixing portion that damper (15), the first aspiration pump (14) form realizes characteristics of contaminated respiratory droplets gas and air composition is mixed
The acquisition of gas is closed with mixing, wherein the first aspiration pump (14), damper (15), flow sensor (17), head-shield (18) are evacuated
Mouth is connected according to this by tracheae, and the first aspiration pump (14) extracts characteristics of contaminated respiratory droplets gas in head-shield through the access, is finally rejected to sky
In gas, for stablizing pumping airflow, flow sensor (17) measures damper (15) for being evacuated flow velocity；By the first gas cylinder (1),
The gas that second gas cylinder (2), four-way valve (9), lambda sensor (10), carbon dioxide sensor (11), the second aspiration pump (13) form
Bulk concentration analysis part realizes gas concentration analysis, wherein four-way valve (9) B ends connection damper (15) and flow sensor
(17) tracheae between, for extracting the gas in tracheae, four-way valve (9) A ends connect surrounding air, for extracting environmental gas,
First gas cylinder (1) middle and high concentration calibration gas is connected to excessive through the first two stage pressure reducing valves (3), the first solenoid valve (5) according to this by conduit
Outgoing interface (7), low concentration demarcates gas by conduit according to this through the second two stage pressure reducing valves (4), second solenoid valve in the second gas cylinder (2)
(6) it is connected to and overflows interface (7) one end, the overfall other end is connected to four-way valve (9) D ends, four-way valve (9) through pressure maintaining valve (8)
It may be selected to open any access of A-C, B-C, D-C, the second aspiration pump (13) connects buffer unit (12), while through lambda sensor
(10) and carbon dioxide sensor (11) extracts four-way valve (9) C-terminal gas；Pump and valve in detection device are responsible for by control unit
Control, the acquisition and upload of data；Human-computer interaction device is used for data processing, analysis and display.
2. a kind of hood type indirect energy test device according to claim 1, it is characterised in that：It is separated by a portion
The transparent head-shield (18) put collects human body exhaled gas, and the mask is by including soft surrounding edge, the sky one for sealing
Gas air inlet and a bleeding point when test is evacuated, forms negative pressure, convection current are formed between air inlet and gas outlet inside head-shield,
People's exhaled gas is pumped into pipeline of fans (16).
3. a kind of hood type indirect energy test device according to claim 1, it is characterised in that：To lambda sensor
(10) when and carbon dioxide sensor (11) is demarcated, first the high pressure marked gas in gas cylinder is pressed by overflowing interface
Power discharges, then marked gas is pumped into lambda sensor (10) and carbon dioxide sensor (11) progress by the second aspiration pump (13)
Concentration calibration.
4. a kind of hood type indirect energy test method, it is characterised in that：When testing beginning, carbon dioxide in head-shield is analyzed
Concentration carrys out the adaptive speed of evacuation for adjusting the first aspiration pump (14), and the speed of the first aspiration pump (14) is divided into several gears, rises
The speed of evacuation gear of the first aspiration pump (14) is preset during the beginning according to weight, analyzed head-shield in the respiratory cycle every 50 seconds thereafter
(18) minimum value and maximum value of interior gas concentration lwevel, and with preset threshold value comparison, adjust wind turbine gear, work as threshold condition
After satisfaction, speed of evacuation gear is kept constant.
5. a kind of hood type indirect energy test method, it is characterised in that：Step is as follows：
Step 1：Valve in front opening four-way valve (9) D-C directions of subject's test closes four-way valve (9) remaining direction
The valve of valve, the calibration of advanced line sensor hight-concentration parts, the first gas cylinder of opening (1) and the first two stage pressure reducing valves (3),
In the first gas cylinder (1) be high concentration gas cylinder, the second aspiration pump (13) extracts gas, the first gas cylinder (1) acceptance of the bid with constant speed
Gas is determined by overflowing interface (7), and a part enters lambda sensor (10) and carbon dioxide sensor (11) by pressure maintaining valve, right
Lambda sensor (10) and carbon dioxide sensor (11) are demarcated, and another part is arranged into air, after a period of time, oxygen sensing
Device (10) and the calibration of carbon dioxide sensor (11) hight-concentration parts terminate, and the first solenoid valve (5) are closed, followed by sensing
The calibration of device low concentration part, opens the valve of the second gas cylinder (2) and the second two stage pressure reducing valves (4), and the second gas cylinder (2) is low dense
Gas cylinder is spent, the second aspiration pump (13) extracts gas with constant speed, and marked gas is by overflowing interface in the second gas cylinder (2)
(7), a part enters lambda sensor (10) and carbon dioxide sensor (11) by pressure maintaining valve, to lambda sensor (10) and dioxy
Change carbon sensor (11) to be demarcated, another part is arranged into air, and after a period of time, lambda sensor (10) and carbon dioxide pass
The calibration of sensor (11) low concentration part terminates, and closes second solenoid valve (6)；
Step 2：The valve in four-way valve (9) A-C directions is opened, closes the valve in four-way valve (9) remaining direction, the second aspiration pump
(13) air in test environment is pumped to by lambda sensor (10) and carbon dioxide sensor (11), oxygen sensing with constant speed
It is dense that device (10) and carbon dioxide sensor (11) measure in a period of time average oxygen concentration and average carbon dioxide in air
Degree；
Step 3：Subject is in the registration of human-computer interaction device's enterprising row information, after completing registration, tester help subject with
Upper head-shield (18) simultaneously informs the points for attention in subject's measurement process, allows or so subject's rest half an hour so as into meditation
Breath state；
Step 4：Open four-way valve (9) B-C directions valve, close four-way valve (9) remaining direction valve, click start by
Button measures beginning wind turbine and starts to be evacuated according to budget speed, negative pressure is formed in head-shield (18), sucks environmental gas and the people of head-shield
The metabolism gas of body exhalation is by sucking exhaust pipe (16) together, at this time according to gas concentration lwevel, every 50 seconds wind turbines
The speed of evacuation can be adjusted adaptively, and after the gas concentration lwevel requirement for reaching setting, the first aspiration pump (14) is with constant gear
Speed extracts gas, and the mixed gas of extraction enters flow sensor (17), and flow sensor (17) measures the stream of mixed gas
Amount, control unit acquire gas flow data by flow sensor (17), and the second aspiration pump (13) is with constant speed to pipeline
(16) gas sample in, a part of mixed gas of sampling enter gas concentration analysis part, and gas concentration analysis portion is separately won
Take gas real-time concentration data in pipeline；
Step 5：The data that human-computer interaction device uploads according to control unit acquisition, extrapolate oxygen uptake in a period of time, dioxy
Change carbon discharge rate, calculate that process is as follows：
Discharge the mixed gas volume of head-shield
Discharge nitrogen gas concn in the mixed gas of head-shield：FEN2=1-FECO2–FEO2
Nitrogen gas concn in surrounding air：FIN2=1-FICO2–FIO2
It is pumped into head-shield hollow gas product：Vin=Vout×FEN2/FIN2
Oxygen uptake：VO2=Vin×FEO2-Vout×FIO2
Carbon dioxide output：VCO2=Vout×FICO2-Vin×FECO2
Wherein：V (t) is mixed gas instantaneous velocity in exhaust pipe (16)；t1The time point started for sampling；t2It is tied for sampling
The time point of beam；FECO2Average gas concentration lwevel in mixed gas to discharge head-shield；FEO2To discharge the mixed gas of head-shield
Middle average oxygen concentration；FIO2To be pumped into average oxygen concentration in air；FICO2To be pumped into average gas concentration lwevel in air.
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| CN201711384501.4A CN108175412B (en) | 2017-12-20 | 2017-12-20 | Head cover type indirect energy testing method and device |
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| CN109692000A (en) * | 2018-12-10 | 2019-04-30 | 中国人民解放军总医院 | Portable V O2 detection device |
| CN110596310A (en) * | 2019-08-05 | 2019-12-20 | 苏州迈优医疗科技有限公司 | Exhaled gas analyzer and operation method |
| CN110720920A (en) * | 2019-10-24 | 2020-01-24 | 合肥博谐电子科技有限公司 | Comprehensive nutrition metabolism tester and detection method thereof |
| CN112889691A (en) * | 2021-01-14 | 2021-06-04 | 黑龙江八一农垦大学 | Simple device for sheep respiratory metabolism experiment and testing method |
| CN113551848A (en) * | 2021-06-07 | 2021-10-26 | 中国船舶重工集团公司第七一八研究所 | Device and method for testing leakage amount of oxygen mask for airplane |
| CN117462112A (en) * | 2023-12-25 | 2024-01-30 | 中科(安徽)智慧健康创新研究院有限公司 | Resting metabolic rate detection equipment and detection device |
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| CN117462112A (en) * | 2023-12-25 | 2024-01-30 | 中科(安徽)智慧健康创新研究院有限公司 | Resting metabolic rate detection equipment and detection device |
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