A kind of device detecting oxygen concentrationTechnical field
The present invention relates to Gas Thickness Detecting Technology field, particularly a kind of device detecting oxygen concentration.
Background technology
The device of detection oxygen concentration of the prior art measures oxygen proportion in nitrogen oxygen mixed gas by ultrasonic technology, and the sensor of this device is in multiple repairing weld process, and because flowing gas exists change, cause sampled data to change large, consistance is poor.In addition, air inlet outlet side and the sense channel of sample gas passage form certain angle, cause in whole sense channel, the gas velocity at two ends is with the flow velocity of air-flow in the flow direction and whole sense channel and flow to inconsistent, increase measuring error, and change for eliminating two ends air-flow the impact brought, then need longer sense channel to meet and measure requirement, cause cost to improve.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of device detecting oxygen concentration, to solve in the sampling process that causes in prior art, because flowing gas exists change, sampled data is caused to change large, consistance is poor, change for eliminating two ends air-flow the impact brought, then need longer sense channel to meet and measure requirement, cause the above-mentioned multinomial defects such as cost raising.
For achieving the above object, the invention provides following technical scheme: a kind of device detecting oxygen concentration, comprise testing circuit plate, it is characterized in that: described testing circuit plate is provided with sense channel, described sense channel and testing circuit plate removably connect, the two ends of described sense channel are respectively equipped with sealant, the both sides of described testing circuit plate are respectively equipped with ultrasonic transmission/reception sensor, the probe of described ultrasonic transmission/reception sensor is sealed in the two ends of sense channel respectively by sealant, the top of described sense channel is provided with sample gas passage, described sample gas passage is parallel to testing circuit plate and arranged in a crossed manner with sense channel, one end of described sample gas passage is provided with air intake opening, the other end is provided with gas outlet, diffusion admittance is provided with between described sample gas passage and sense channel.
Preferably, the two side of described sense channel is respectively equipped with locating piece, and described locating piece and testing circuit plate are bolted.
Preferably, described sealant is epoxide-resin glue water layer.
Preferably, described testing circuit plate is provided with some mounting holes.
The beneficial effect of above technical scheme is adopted to be: the device of the detection oxygen concentration of structure of the present invention, sample gas passage becomes the shaping distribution of right-angled intersection with sense channel, air intake opening is offered in one end of sample gas passage, the other end sets out gas port, one end diffusion admittance is installed between sample gas passage and sense channel, when sample gas flows through in sample gas passage, by in diffusion admittance flow detection passage, according to Fick law, high concentrations of gas spreads to light concentration gas, gas concentration in last sample gas passage and sense channel reaches mobile equilibrium, within the unitary sampling time period (0.01s), in sense channel, partial pressure of oxygen can be considered constant, these conditions meet sampling request, meet without the need to longer sense channel and measure requirement, reduce costs, avoid the harmful effect of existing detection technique simultaneously, sampled data is changed less, keep consistency, ultrasonic transmission/reception sensor is in dynamic balance state at sample gas, ultrasound wave is transmitted and received in sense channel, by the speed of detection computations ultrasonic propagation, the volume fraction of the oxygen obtaining nitrogen oxygen mixed gas in sense channel can be calculated, improve detection degree of accuracy.
Accompanying drawing explanation
Fig. 1 is the device of the detection oxygen concentration of prior art;
Fig. 2 is structural representation of the present invention;
Fig. 3 is vertical view of the present invention.
Wherein, 1-testing circuit plate, 2-sense channel, 3-sealant, 4-ultrasonic transmission/reception sensor, 5-sample gas passage, 6-air intake opening, 7-gas outlet, 8-diffusion admittance, 9-mounting hole, 10-locating piece, 11-bolt.
Embodiment
The preferred embodiment of the present invention is described in detail below in conjunction with accompanying drawing.
Fig. 2 and Fig. 3 shows the specific embodiment of the present invention: a kind of device detecting oxygen concentration, comprise testing circuit plate 1, described testing circuit plate 1 is provided with sense channel 2, described sense channel 2 removably connects with testing circuit plate 1, the two ends of described sense channel 2 are respectively equipped with sealant 3, the both sides of described testing circuit plate 1 are respectively equipped with ultrasonic transmission/reception sensor 4, the probe of described ultrasonic transmission/reception sensor 4 is sealed in the two ends of sense channel 2 respectively by sealant 3, the top of described sense channel 2 is provided with sample gas passage 5, described sample gas passage 5 is parallel arranged in a crossed manner with sense channel 2 with testing circuit plate 1, one end of described sample gas passage 5 is provided with air intake opening 6, the other end is provided with gas outlet 7, diffusion admittance 8 is provided with between described sample gas passage 5 and sense channel 2.
In the present embodiment, the two side of described sense channel 2 is respectively equipped with locating piece 10, and described locating piece 10 is connected by bolt 11 with testing circuit plate 1, by locating piece 10, sense channel 2 is arranged on testing circuit plate 1, install firmly, good stability, and dismantle convenient.
In the present embodiment, described sealant 3 is epoxide-resin glue water layer, epoxy resin glue good sealing effect, and cheap, reduces costs.
In the present embodiment, described testing circuit plate 1 is provided with some mounting holes 9, is convenient to the installation of whole device.
Based on above-mentioned, the device of the detection oxygen concentration of structure of the present invention, sample gas passage 5 distribution shaping with sense channel 2 one-tenth right-angled intersection, air intake opening 6 is offered in one end of sample gas passage 5, the other end sets out gas port 7, between sample gas passage 5 and sense channel 2, one end diffusion admittance 8 is installed, when sample gas flows through in sample gas passage 5, by in diffusion admittance 8 flow detection passage 2, according to Fick law, high concentrations of gas spreads to light concentration gas, last sample gas passage 5 reaches mobile equilibrium with the gas concentration in sense channel 2, because the mode of measured gas by diffusion enters and be evenly distributed in sense channel 2, disturb without too much dynamic air current, data fluctuations is little, reduce measuring error, improve measuring accuracy, simultaneously, data sampling can be carried out in shorter sense channel 2, meet without the need to longer sense channel and measure requirement, reduce costs.
Above-described is only the preferred embodiment of the present invention, it should be pointed out that for the person of ordinary skill of the art, and without departing from the concept of the premise of the invention, can also make some distortion and improvement, these all belong to protection scope of the present invention.