CN201237583Y - Apparatus for analyzing oxygen concentration and flow velocity - Google Patents
Apparatus for analyzing oxygen concentration and flow velocity Download PDFInfo
- Publication number
- CN201237583Y CN201237583Y CNU2008200131525U CN200820013152U CN201237583Y CN 201237583 Y CN201237583 Y CN 201237583Y CN U2008200131525 U CNU2008200131525 U CN U2008200131525U CN 200820013152 U CN200820013152 U CN 200820013152U CN 201237583 Y CN201237583 Y CN 201237583Y
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- container
- flow velocity
- vessel
- oxygen concentration
- ultrasonic transducer
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Abstract
The utility model relates to oxygen analysis technology, in particular to a device for analyzing concentration and velocity of flow of oxygen by means of ultrasonic wave, which consists of a sensor unit and a signal processing and control circuit; the sensor unit comprises a vessel provided with circuit boards respectively on two ends; an inner cavity of the vessel is arranged in the vessel; an inlet and an outlet exterior cavities are respectively arranged in the vessel and out of the inner cavity of the vessel and are communicated through the inner cavity of the vessel; on the vessel, an air inlet and an air outlet are respectively arranged and respectively communicated with the inlet and outlet exterior cavities; ultrasonic transducers are respectively installed on two circuit boards, which are symmetrically arranged at two ports of the inner cavity of the vessel; either of the ultrasonic transducers is provided with a temperature sensor through a long pipe leg lead; the temperature sensor is inserted and arranged in the inner cavity of the vessel; the two ultrasonic transducers are respectively and electrically connected with the signal processing and control circuit. The device for analyzing concentration and velocity of flow of oxygen by means of ultrasonic wave has the advantages of compact structure, simple standardization, convenient installation, and accurate allocation of the circuit board and the vessel.
Description
Technical field
The utility model relates to the oxygen analytical technology, specifically a kind of device that utilizes ultrasonic analysis oxygen concentration and flow velocity.
Background technology
The main application of oxygenerator is that airborne nitrogen and carbon dioxide separation are gone out, and the oxygen of exporting variable concentrations more as required is used for fields such as medical treatment, space flight, welding; For example, the molecular sieve oxygen generation machine can be exported concentration up to 95.7% oxygen, but still has 4.3% argon gas not filter.Therefore, oxygenerator needs monitoring output concentration of oxygen and flow velocity in actual applications, and for the application of medical field, the oxygen of supplying with patient's high concentration, constant flow rate is vital especially.At present, the device of existing monitoring concentration of oxygen output and flow velocity, the mode of employing sensor, such sensor mainly is primary raw material with the zirconia, adopts electrochemical method monitoring oxygen concentration, but can not measure the flow velocity of oxygen simultaneously; The greatest problem that this method exists is the increase along with service time, the chemical property of chemical substance can change, and then cause the decline of accuracy of measurement, just need carry out concentration calibration or direct emat sensor more to user's oxygen sensor again, increase the after-sales service expense of machine, and influenced user's use.
Along with development of science and technology, engendered and utilized ultrasound wave to monitor oxygen.Ultrasound wave is meant that frequency is higher than the mechanical wave of 20KHz, and its benefit is to avoid the influence of signal acquisition process periphery sound to signal.For with ultrasound wave as detection means, adopted ultrasonic sensor, be called ultrasonic transducer or ultrasonic probe traditionally.Ultrasonic sensor has transmitter and receiver, but a ultrasonic sensor also can have the double action that sends and receive sound wave.Ultrasonic sensor is to utilize the principle of piezoelectric effect that electric energy and ultrasound wave are transformed mutually, promptly when emission is hyperacoustic, with the electric energy conversion, launches ultrasound wave; When receiving echo, then convert ultrasonic vibration to electric signal.The existing device that utilizes monitoring ultrasonic oxygen, distance is too short between the sensor that is provided with in its cavity, and the sound wave conduction time is very fast, so be easy to generate bigger error.Simultaneously, the purpose of its cavity body structure is in order to keep intracavity gas constant, to monitor oxygen concentration as an air flue bypass, and the gas flow of sampling is fewer, also can produce with actual and differ bigger error.Have again, have now and utilize ultrasound wave also can only monitor concentration of oxygen, and can not measure the flow velocity of oxygen simultaneously.
The utility model content
Utilize ultrasound wave can not monitor oxygen concentration and flow velocity, problem that the monitoring error is big simultaneously in order to solve, the purpose of this utility model is to provide a kind of device that can analyze oxygen concentration and flow velocity continuously.
The purpose of this utility model is achieved through the following technical solutions:
The utility model comprises sensor unit and signal processing control circuit, described sensor unit comprises that two ends are separately installed with the container of circuit board, have container intracavity in the container, in container, the container intracavity outside be respectively equipped with into, go out extra-oral cavity, both are connected by container intracavity, have air intake and gas outlet on the container, respectively with go into, go out extra-oral cavity and be connected; Be separately installed with ultrasonic transducer on two circuit boards, two ultrasonic transducers are symmetricly set on the two-port of container intracavity; Wherein be provided with temperature sensor by long tube leg lead-in wire on any one ultrasonic transducer, temperature sensor is inserted in the container intracavity; Two ultrasonic transducers are electrically connected with signal processing control circuit respectively.
Wherein: described container intracavity is cylindrical, and the axial cross section of its two-port is trapezoidal, and ultrasonic transducer is inserted in it, leaves the slit that supplied gas is passed through between the port inner wall of ultrasonic transducer and container intracavity; Described container is cylindrical, goes into extra-oral cavity and go out extra-oral cavity to be provided with respectively along the circumferencial direction of container intracavity outside, and the end adjacent one another are of going into, go out extra-oral cavity is blind end, and the other end is connected by container intracavity; Described ultrasonic transducer is cylindrical, is fixed in the inside surface of circuit board; The circuit board that has temperature sensor is provided with four lead legs, and another is provided with two lead legs; Have locating slot on the circuit board, the projection on the container end face is placed in it; The length of container is 11 centimetres; The circuit board at container two ends is connected with seal of vessel.
Advantage of the present utility model and good effect are:
1. analytical equipment compact conformation of the present utility model need not routine maintenance and changes element, and demarcates simple.
2. install easy for installation, circuit board and container accurate positioning; Fast to the concentration change response speed, save the energy.
3. the utility model flows into the gas in the container, through going into the buffer action of extra-oral cavity, has eliminated the laminar flow of tested oxygen, and gas medium flows into stable.
Description of drawings
Fig. 1 is the utility model sensor unit one-piece construction synoptic diagram;
Fig. 2 is for having the structural representation of the ultrasound wave parallel operation circuit board of temperature sensor among Fig. 1;
Fig. 3 is the utility model gas flow synoptic diagram to be measured;
Fig. 4 is the utility model sensor unit wiring layout;
Fig. 5 is the utility model circuit block diagram;
Fig. 6 is a program flow diagram of the present utility model;
Wherein, 1 is sensor unit, and 2 is container, 3 for going out extra-oral cavity, and 4 is first circuit board, and 5 is second circuit board, 6 is first ultrasonic transducer, and 7 is second ultrasonic transducer, and 8 is temperature sensor, 9 is air intake, and 10 is the gas outlet, and 11 for going into extra-oral cavity, 12 is container intracavity, and 13 are long tube leg lead-in wire, and 14 is locating slot, 15 is lead leg, and 16 is projection.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
As Fig. 1, Fig. 3 and shown in Figure 4, the utility model comprises sensor unit 1 and signal processing control circuit.Sensor unit 1 comprises container 2 and is installed in first and second circuit board 4,5 at container 2 two ends that the container 2 of present embodiment is cylindrical, long 11 centimetres; Have columniform container intracavity 12 in the container 2, the axial cross section of its two-port is trapezoidal; In container 2, be respectively equipped with into, go out extra-oral cavity 11,3, both are provided with respectively along the circumferencial direction of container intracavity 12 outsides, the end adjacent one another are of going into, go out extra-oral cavity 11,3 is blind end, the other end is connected by container intracavity 12; Have air intake 9 and gas outlet 10 on the container 2, respectively with go into, go out extra-oral cavity 11,3 and be connected.As shown in Figure 2, be separately installed with first and second ultrasonic transducer 6,7 on first and second circuit board 4,5, ultrasonic transducer is cylindrical, is fixed in the inside surface of circuit board; Wherein be provided with temperature sensor 8 by long tube leg lead-in wire 13 on first ultrasonic transducer; First and second ultrasonic transducer 6,7 is symmetricly set on the two-port of container intracavity 12, leaves the slit that supplied gas is passed through between the port inner wall of ultrasonic transducer and container intracavity 12; Temperature sensor 8 inserts into the inner portion by an end of container intracavity 12.Corresponding long tube leg lead-in wire 13 is provided with four lead legs on the first circuit board 4, and second circuit board 5 is provided with two lead legs; All have locating slot 14 on first and second circuit board 4,5, when first and second circuit board 4,5 when container 2 end faces are installed, the projection 16 on container 2 end faces can be placed in location in the locating slot 14 earlier, again by trip bolt tight.First and second circuit board 4,5 and container 2 are tightly connected, and leak the impact analysis result to avoid tested gas., the connection terminal of first and second ultrasonic transducer 6,7 links to each other with the sensor signal input end of signal processing control circuit respectively.Described signal processing control circuit comprises microprocessor, handover network, receiving element and transmitter unit, the concrete connection: the signal input part of first and second ultrasonic transducer all links to each other with handover network in signal processing control circuit, handover network is controlled by the control signal that microprocessor sends, and controls its passage and switches; Handover network is connecting receiving element and transmitter unit, gives microprocessor by receiving element handling signal well, and microprocessor control transmitter unit produces the excitation of 100us burst pulse; Microprocessor also is connected with temperature sensor.
The analytical approach of the utility model device:
Control one of them ultrasonic transducer emission ultrasound wave with the transmitter unit that is connected with signal processing control circuit, the another one ultrasonic transducer receives, emission and reception with the handover network switching controls ultrasonic transducer on the signal processing control circuit, go out the temperature T of this moment oxygen simultaneously with temperature sensor measurement, receiving element is delivered to microprocessor with signal, obtains ultrasound wave forward conduction time t with respect to gas flow in tested oxygen
fAnd reverse conduction time t
rCalculate tested concentration of oxygen P and flow velocity Q by funtcional relationship again;
Wherein: the calculating formula of tested oxygen concentration is:
Wherein: C1, C2, C3 are the constant of sensor unit, and T is the temperature of tested oxygen; The calculating formula of tested oxygen gas flow rate is: Q=ABS (C4 (t
r-t
r))+C5, wherein: C4, C5 are the constant of sensor unit.
Microcontroller on the signal processing control circuit gave one of them ultrasonic transducer a 100us burst pulse excitation by transmitter unit through handover network every one second, start the clock source that microcontroller is done counting unit with the clock source of 12MHz frequency simultaneously, the enabling counting function.
Principle of work of the present utility model is:
As shown in Figure 3, tested flow of oxygen to is with shown in the arrow in scheming, and tested oxygen is by in the air intake 9 flow sensor unit 1, because container intracavity 12 port inner wall axial cross sections are trapezoidal design, gas enters container intracavity along the port inner wall balance that tilts; Through going into the buffer action of extra-oral cavity 11, eliminated the laminar flow of oxygen to be measured, stable gas medium flows into container intracavity 12, is flowed out by gas outlet 3 through going out extra-oral cavity 3 again, has guaranteed stable source of the gas from machinery is textural.
Microprocessor 16 on the signal processing control circuit is giving first ultrasonic transducer 6 one 100us burst pulse excitations with frequency control transmitter unit of per second through handover network, the frequency of ultrasonic transducer is selected in 40kHz, start the clock source that microcontroller is done counting unit with the clock source of 12MHz frequency simultaneously, the enabling counting function; After second ultrasonic transducer 7 receives signal, signal is amplified to receiving element, delivers to microprocessor after the filtering through handover network, write down current accumulative total numeration, be forward conduction time t
fSimultaneously, the microprocessor control transmitter unit of signal processing control circuit starts 7 one 100us burst pulse excitations of second ultrasonic transducer through handover network, at this moment handover network changes first ultrasonic sensor 6 into accepting state, second ultrasonic sensor 7 changes emission state into, when first ultrasonic sensor 6 receives signal, signal amplifies to receiving element, delivers to microprocessor after the filtering through handover network, writes down current accumulative total numeration, is reverse conduction time t
rMicrocontroller is measured the temperature T of this moment gas by temperature sensor 8 simultaneously.The C1 of present embodiment for-6.01, C2 for-0.273, C3 is 824.4, if t at this moment
fBe 0.002622 second, t
rBe 0.0026372 second, following 25 ℃ of normal temperature can be through formula
Calculating tested oxygen concentration is 94.5%; Adopting C4 is 107568, and C5 is 0.23, by formula Q=ABS (C4 (t
f-t
r))+C5, can draw tested oxygen gas flow rate is 1.865L/min.
Because it is the relevant principle of molecular weight, temperature with gas that the utility model has adopted sound wave velocity of propagation in different density gas, has avoided adopting chemical substance chemical property in the chemical method monitoring oxygen concentration to change and caused the decline of accuracy of measurement; In control, adopted forward and reverse conduction test, avoided because the Doppler effect that flow velocity produced of gas; Also owing to utilized Doppler effect, released gas flow rate and time relation simultaneously, adopted forward and reverse conduction that the benefit that shortens device is also arranged by the positive and negative conduction time difference of gas.
The utility model is by first and second ultrasonic transducer 6,7 of microcontroller switching controls, to obtain ultrasound wave forward conduction time and reverse conduction time with respect to gas flow in oxygen to be measured, obtain gas temperature information by temperature sensor 8, both forward and reverse directions conduction time sum becomes certain funtcional relationship (referring to the densimeter formula) with gas concentration under temperature-resistant situation, simultaneously by temperature compensation, can obtain the relation of gas conduction time sum and concentration under the different temperatures.And the difference of both forward and reverse directions conduction time is and the flow velocity of gas linear (participating in the velocimeter formula), can calculate tested concentration of oxygen and flow velocity simultaneously by funtcional relationship like this.The utility model can be used for fields such as medical treatment, environment measuring, for example is used to monitor the oxygen concentration and the flow velocity of patients accepting oxygen inhalation; The utility model also can be used for analyzing the concentration and the flow velocity of other gases.
Claims (7)
1. device of analyzing oxygen concentration and flow velocity, comprise sensor unit and signal processing control circuit, it is characterized in that: described sensor unit (1) comprises that two ends are separately installed with the container of circuit board (2), have container intracavity (12) in the container (2), in container (2), container intracavity (12) outside be respectively equipped with into, go out extra-oral cavity (11,3), both are connected by container intracavity (12), have air intake (9) and gas outlet (10) on the container (2), respectively with go into, go out extra-oral cavity (11,3) and be connected; Be separately installed with ultrasonic transducer on two circuit boards, two ultrasonic transducers are symmetricly set on the two-port of container intracavity (12); Wherein be provided with temperature sensor (8) by long tube leg lead-in wire (13) on any one ultrasonic transducer, temperature sensor (8) is inserted in the container intracavity (12); Two ultrasonic transducers are electrically connected with signal processing control circuit respectively.
2. press the device of described analysis oxygen concentration of claim 1 and flow velocity, it is characterized in that: described container intracavity (12) is for cylindrical, the axial cross section of its two-port is trapezoidal, ultrasonic transducer is inserted in it, leaves the slit that supplied gas is passed through between the port inner wall of ultrasonic transducer and container intracavity (12).
3. press the device of described analysis oxygen concentration of claim 1 and flow velocity, it is characterized in that: described container (2) is for cylindrical, go into extra-oral cavity (11) and go out extra-oral cavity (3) and be provided with respectively along the outside circumferencial direction of container intracavity (12), the end adjacent one another are of going into, go out extra-oral cavity (11,3) is blind end, and the other end is connected by container intracavity (12).
4. by the device of described analysis oxygen concentration of claim 1 and flow velocity, it is characterized in that: described ultrasonic transducer is cylindrical, is fixed in the inside surface of circuit board; The circuit board that has temperature sensor (8) is provided with four lead legs, and another is provided with two lead legs.
5. by the device of described analysis oxygen concentration of claim 1 and flow velocity, it is characterized in that: have locating slot (14) on the described circuit board, the projection (16) on container (2) end face is placed in it.
6. by the device of described analysis oxygen concentration of claim 1 and flow velocity, it is characterized in that: the length of described container (2) is 11 centimetres.
7. by the device of described analysis oxygen concentration of claim 1 and flow velocity, it is characterized in that: the circuit board and the container (2) at described container (2) two ends are tightly connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200131525U CN201237583Y (en) | 2008-05-26 | 2008-05-26 | Apparatus for analyzing oxygen concentration and flow velocity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200131525U CN201237583Y (en) | 2008-05-26 | 2008-05-26 | Apparatus for analyzing oxygen concentration and flow velocity |
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| Publication Number | Publication Date |
|---|---|
| CN201237583Y true CN201237583Y (en) | 2009-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200131525U Expired - Fee Related CN201237583Y (en) | 2008-05-26 | 2008-05-26 | Apparatus for analyzing oxygen concentration and flow velocity |
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| Country | Link |
|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102469967A (en) * | 2009-06-30 | 2012-05-23 | 爱科来株式会社 | Continuous analysis device and sample component control system |
-
2008
- 2008-05-26 CN CNU2008200131525U patent/CN201237583Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102469967A (en) * | 2009-06-30 | 2012-05-23 | 爱科来株式会社 | Continuous analysis device and sample component control system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090513 Termination date: 20120526 |