CN105011937A - Portable measurement device for respiratory metabolism - Google Patents
Portable measurement device for respiratory metabolism Download PDFInfo
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- CN105011937A CN105011937A CN201510319459.2A CN201510319459A CN105011937A CN 105011937 A CN105011937 A CN 105011937A CN 201510319459 A CN201510319459 A CN 201510319459A CN 105011937 A CN105011937 A CN 105011937A
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Abstract
The invention provides a portable measurement device for a respiratory metabolism applied to a test of respiratory metabolism for livestock. The portable measurement device comprises a respiratory chamber (1), an axial flow fan (4) and a centrifugal fan (8). The side walls of the respiratory chamber (1) are provided with thermocouples (5). An air inlet (2) and an air outlet (3) are arranged on two side walls and oppositely arranged. The air outlet (3) is connected with a digital display gas mass flow meter (6) by means of a pipeline and finally connected with the centrifugal fan (8). The centrifugal fan (8) is connected with an infinitely variable transmission (11) and a voltage stabilizer (12) by means of the pipeline. A sampling pipe is connected with an air channel pipeline. An air sampling pump equipped on an instrument is used for conveying gas samples to a paramagnetic oxygen analyzer (9) and an infrared gas analyzer (10) by means of a drying bottle (7) for analytic determination. The portable measurement device for the respiratory metabolism has following beneficial effects: by setting up an open-type respiratory chamber, air flow exhaled by livestock is collected and then dried in order to be conveyed into the paramagnetic oxygen analyzer and the infrared gas analyzer for measurement; a measuring process is performed conveniently and rapidly so that the portable measurement device is suitable for measurement of respiratory metabolism for all kinds of livestock; and the portable measurement device has a simple structure and is suitable for promotional use.
Description
Technical field
The present invention's design relates to a kind of animal experiment device capable, particularly a kind of device domestic animal being carried out to respiratory metabolism determining.
Background technology
Respiratory calorimetry apparatus is the important means that research and mensuration domestic animal law of energy metabolism, energy demand, fodder energy conversion and energy value are evaluated.Respiratory calorimetry apparatus can be divided into 3 types: closed type, open-type and open.Wherein closed type requires that whole breath heat measurement system is completely airtight, need be furnished with supplemental oxygen device.Open-type also requires that breath heat measurement cell is completely airtight, has automatic open device.This two type generally has air conditioning system requirement breath heat measurement cell to seal, heat insulation again.Therefore design complexity, cost is high, and maintenance cost is also high, and huge structure, be unfavorable for carrying transport.Open compared with the above two, be characterized in the system of an open type, do not require strictly airtight to breath heat measurement room, cost is low, simple to operate.
For existing scientific research, Production requirement and domestic level, the present invention relates to a kind of portable respiratory metabolism determining device, this device combines along the high precision instrument such as magnetic oxygen analyzer and gas analyser, is applicable to the larger animals such as various domestic animals.Project organization of the present invention is simple, strong operability, and versatility is wide, can carry out domestic animal respiratory metabolism experiment.
Summary of the invention
The present invention is made up of respiratory metabolism determining room, digital display mass-flow gas meter, aerofoil fan, centrifugal blower, gas production pump, manostat, buncher, thermocouple, exsiccator, suitable magnetic oxygen analyzer, infrared gas analyser.Breath heat measurement cell is configured to by transparent plexiglass plate, plywood and aluminum alloy frame, and volume is 100 × 100 × 140cm
3(concrete size is depending on experimental animal).Small axial flow fan is equipped with in the middle of cell end face and corner, and make the air-flow of little indoor formation stable and uniform, the airflow direction of fan all points to cell top inwardly to avoid air-flow directly to blow to laboratory animal.The little chamber interior walls of breath heat measurement installs a pair thermocouple to survey indoor air temperature.This respiratory metabolism determining device is closed by other light basis weight material such as poly (methyl methacrylate) plate, plywood, and air intake is relative with gas outlet and be located in both sidewalls.Gas outlet is on the lower side, and gas outlet connects dynamical system and sampling analysis system by pipeline.Air intake, gas outlet and pipe-line system form open respiratory calorimetry apparatus.
Purpose of design of the present invention is the problems such as the seal existed for traditional domestic animal respiration measuring device requires height, cost and maintenance cost high, there is provided a kind of low cost, structure simple, easily to implement and the wide domestic animal respiratory metabolism determining device of versatility, solve by the following technical programs:
A kind of portable respiratory metabolism determining device, comprise respiratory chamber, aerofoil fan and centrifugal blower, this aerofoil fan is arranged on the top of respiratory chamber, it is characterized in that an opening of described respiratory chamber forms air intake, the opposite face of air intake is provided with gas outlet, gas outlet connects digital display mass-flow gas meter by pipeline, is finally connected with centrifugal blower.Centrifugal blower provides power for system, and stablize extraction room air, air flow rate is controlled.Air collecting pipe along magnetic oxygen analyzer and infrared gas analyser accesses in outlet pipe, with constant flow velocity, gas sample drying agent bottle is sent into Instrumental Analysis by gas production pump.
Described respiratory chamber is configured to by transparent plexiglass plate, plywood and aluminum alloy frame.
Described centrifugal blower is connected controlled with guaranteed flow by circuit with buncher.
Described buncher is provided with coupled manostat, ensures centrifugal blower steady operation.
The sidewall of described respiratory chamber is provided with the thermocouple measuring indoor air temperature.
Described gas outlet is connected with digital display mass-flow gas meter by pipeline, to measure QI KOU capacity.
Described oxygen analyzer is connected gas channels with gas analyser through desiccant, in order to avoid instrument is impaired.
The present invention's design is compared prior art and is had the following advantages:
The present invention's design, by building an open respiratory metabolism room, is delivered to and is carried out analysiss mensuration along magnetic oxygen analyzer and infrared gas analyser after respiratory chamber collects the air-flow that domestic animal breathes out after gas production is pumped to exsiccator inner drying.Respiratory chamber system is connected by airtight gas circuit with sampling analysis system, detects in real time, synchronously carries out, and reduces unnecessary operate miss, and then improves the accuracy of whole breath heat measurement system.
The design's device contains effusion meter, ensures out that throughput can be carried out adjustment change with laboratory animal and accurately obtain flow system flow numerical value.Effusion meter used is digital display type mass-flow gas meter is the application of MEMS (microelectromechanical systems) technology, realizes low discharge test, precision high (resolution is 0.01L/min, and precision is 2.5%, and error is only 0.00025L/min); Low Power Consumption Portable designs, and volume is little, is easy to install (weight is only 350 grams, and main body is pyrite); Energy Real-Time Monitoring instantaneous delivery and calculating integrated flow, copper body can be used in various gas medium and measures.
This system provides major impetus by low-pressure type centrifugal blower, compared with typical high power blower fan, this power of fan little (120w), rotating speed low (2800r/min), and centrifugal blower and pipeline interlock formation one relative airtight system, dynamical stability, noise is little, few on laboratory animal impact.
Accompanying drawing explanation
The plan structure schematic diagram that accompanying drawing 1 designs for the present invention.
Wherein: (1)-respiratory chamber; (2)-air inlet; (3)-gas outlet; (4)-aerofoil fan; (5)-thermocouple; (6)-digital display mass-flow gas meter; (7)-drying bottle; (8)-centrifugal blower; (9)-along magnetic oxygen analyzer; (10)-infrared gas analyser; (11)-buncher; (12)-manostat.
Detailed description of the invention
Below in conjunction with accompanying drawing and example the present invention designed and be further described.
As shown in Figure 1: a kind of portable respiratory metabolism determining device, comprise respiratory chamber (1), aerofoil fan (4) and centrifugal blower (8), this respiratory chamber (1) is configured to by transparent plexiglass plate, plywood and aluminum alloy frame; Air inlet (2) is relative with gas outlet (3) and be located on two side, and gas outlet (3) connect digital display mass-flow gas meter (6) by pipeline, are finally connected with centrifugal blower (8).Centrifugal blower (8) is connected to regulate air flow rate by circuit with buncher (11), and buncher (11) is provided with coupled manostat (12) to ensure centrifugal blower (8) steady operation in addition.Sampling tube connects gas path pipe, and the gas production pump carried by instrument carries out analysis mensuration by sending into respectively after bottle (7) drying of gas sample drying along magnetic oxygen analyzer (9) and infrared gas analyser (10).The sidewall of respiratory chamber (1) is provided with thermocouple (5) and can surveys indoor air temperature, and in order to make the air Homogeneous phase mixing in respiratory chamber (1), in the middle part of respiratory chamber (1) end face, corner is provided with small axial flow fan (5), and end face inside is pointed in fan airstream direction, in order to avoid air-flow directly blows to laboratory animal.
Measuring range along magnetic oxygen analyzer (9) used is oxygen concentration 0 ~ 100%, and its degree of accuracy is 0.01% of greatest measurement.By the outfan of gas analyzer for O2 by printout per minute for oxygen concentration measured value once, each thermocouple measured temperature also printout simultaneously.Infrared photo acoustic gas analyser used can measure the gases such as methane, ammonia, carbon monoxide, carbon dioxide, nitrous oxide, survey measured value also printout per minute be once.The air flow rate of this determinator controls at 80 ~ 150L/min, and thermocouple (5) also corrects for nitrogen while measuring the gas flow temperature in respiratory chamber 1.
System test: correct this respiratory calorimetry apparatus of inspection with nitrogen injection method.With high-purity nitrogen (99.9%), inject the little indoor of breath heat measurement with the flow velocity of 0.6 ~ 0.8L/min.After gas discharge amount reaches three times of cell volume, the oxygen concentration of gas outlet Exhaust Gas tends towards stability, then measures 5 minutes, gets its meansigma methods and to give vent to anger oxygen concentration as cell.Nitrogen injection period, the Exhaust Gas flow of record per minute once this system.Measuring the oxygen concentration in respiratory chamber before nitrogen injection, getting its meansigma methods as entering gas oxygen concentration.According to Mclean and Tobin (1987) report, by following formulae discovery nitrogen recycling amount:
V＝t×Q(O
2In-O
2out)/O
2In
In formula: V---nitrogen recycling amount (L), t---nitrogen injection length (min)
Q---breathe primary gas chamber output (L/min)
O
2In, O
2out-be respectively into, oxygen concentration of giving vent to anger (%)
R＝V/V’
V '---nitrogen injection rate, R---rate of recovery of nitrogen is also the respiratory calorimetry apparatus response rate
Show according to nitrogen corrective experiment result, rate of recovery of nitrogen in respiratory chamber 1 is respectively 99.69%, 100.38%, 100.69%, 99.29%, 99.26%, its repetitive error (standard deviation) is 0.65%, therefore the determinator of the present invention's design can be used in domestic animal respiratory metabolism measurement.
The nitrogen correction test result of the open breath heat measurement system of table 1.
Above embodiment is only the technological thought that the present invention's design is described, the protection domain of this reality invention design can not be limited with this, every technological thought designing proposition according to the present invention, any change that technical scheme basis is done, all falls within design protection scope of the present invention; The technology that the present invention does not relate to all is realized by prior art.
Claims (5)
1. a portable respiratory metabolism determining device, comprises respiratory chamber (1), aerofoil fan (4), effusion meter (6) and centrifugal blower (8); The sidewall of respiratory chamber 1 is provided with thermocouple 5, air inlet (2) is relative with gas outlet (3) and be located on two side, gas outlet (3), by pipeline connection traffic meter (6), is finally connected with centrifugal blower (8).Centrifugal blower (8) is connected to regulate air flow rate by circuit with buncher (11), and buncher (11) is provided with coupled manostat (12) to make centrifugal blower (8) steady operation in addition.Sampling tube connects gas path pipe, and the gas production pump carried by instrument carries out analysis mensuration by sending into respectively after bottle (7) drying of gas sample drying along magnetic oxygen analyzer (9) and infrared gas analyser (10).
2. open respiratory metabolism determining device according to claim 1, is characterized in that described gas outlet (3) gas path pipe is connected with effusion meter, can accurately record gas outlet gas output.
3. open respiratory metabolism determining device according to claim 1, is characterized in that described centrifugal blower is connected with buncher (11), also with manostat (12) be connected, to ensure stable to provide system dynamic.
4. open respiratory metabolism determining device according to claim 1, is characterized in that the sidewall of described respiratory chamber (1) is provided with the thermocouple (5) measuring respiratory chamber (1) interior temperature, can measure breathing indoor air temperature.
5. open respiratory metabolism determining device according to claim 1, is characterized in that the airflow direction of described aerofoil fan (4) points to cell end face and corner internal direction, directly blows to laboratory animal to avoid air-flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510319459.2A CN105011937A (en) | 2015-06-08 | 2015-06-08 | Portable measurement device for respiratory metabolism |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510319459.2A CN105011937A (en) | 2015-06-08 | 2015-06-08 | Portable measurement device for respiratory metabolism |
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| CN105011937A true CN105011937A (en) | 2015-11-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110320326A (en) * | 2019-05-31 | 2019-10-11 | 吉林省农业科学院 | The measuring method of gas reclaiming rate in respiratory metabolism cabin |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110320326A (en) * | 2019-05-31 | 2019-10-11 | 吉林省农业科学院 | The measuring method of gas reclaiming rate in respiratory metabolism cabin |
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Application publication date: 20151104 |