CN201043962Y - Oxygen sensor - Google Patents
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- CN201043962Y CN201043962Y CNU2007200664953U CN200720066495U CN201043962Y CN 201043962 Y CN201043962 Y CN 201043962Y CN U2007200664953 U CNU2007200664953 U CN U2007200664953U CN 200720066495 U CN200720066495 U CN 200720066495U CN 201043962 Y CN201043962 Y CN 201043962Y
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Abstract
The utility model provides an oxygen sensor, which comprises a current limiter (230), an electrolyte or electrode assemblies (112,110,114), and a shell (222). The current limiter is equipped with an inserted part (270), which can be at least one convex on the side surface of the current limiter, or a circular shape around the side surface of the current limiter. The shell is arranged on the inner surface with at least one concave, whose shape approximately matches that of the inserted part. The bayonet structure between the current limiter and the shell allows miniature and good-airproof oxygen sensor to be provided. A zirconium-made capillary tube can be included in the capillary hole of the current limiter, improving the product consistency of the oxygen sensor. In addition, the electrolyte can be GEFC-10N total fluorine proton exchange membrane, which can improve the measurement of oxygen sensor. The utility model has the performances of good stability, long service life, and good anti-resistance.
Description
Technical field
The utility model relates to a kind of oxygen sensor, relates in particular to a kind of electrolysis-type oxygen sensor.
Background technology
The electrochemistry oxygen gas sensor is a kind of sensor that is widely used for monitoring oxygen at present.Denomination of invention is the U.S. patent of invention US4 of " GAS SENSOR ", 132,616 and US4, and 324,632 have described a kind of oxygen sensor of galvanic cell type.In the work, oxygen is diffused into working electrode by a pore, with sub combination of power and water there, reduction reaction takes place, and forms hydroxide ion.Hydroxide ion to electrode, with the lead electrode reaction, forms massicot, power and water by electrolyte flow.Hydroxide ion is at working electrode with to the mobile formation electric current between the electrode, and this electric current is directly proportional with the percent concentration of oxygen.Thus, can learn oxygen concentration by measuring electric current.
Denomination of invention has been described a kind of electrolysis-type oxygen sensor for the U.S. Patent application US2005/0034987 of " SOLID POLYMER ELECTROLYTE OXYGEN SENSOR ", its critical component is an electrolyte/electrode, specifically comprises solid electrolyte, working electrode, to electrode and contrast electrode.Wherein, working electrode is installed in a side of solid electrolyte, electrode and contrast electrode is installed in the opposite side of solid electrolyte.In the work, oxygen is diffused into working electrode by a pore, combines with the hydrogen ion and the electronics of there, and reduction reaction takes place, and forms hydrone.Hydrone is penetrated into its opposite side by solid electrolyte.On the other hand, to the electrode place, hydrone is formed oxygen, hydrogen ion and electronics by electrolysis.In formed oxygen, hydrogen ion and electronics, oxygen is discharged from a venthole, and hydrogen ion is moved to working electrode by solid electrolyte, electronics then by an external circuit from electrode is reached working electrode.Move to the hydrogen ion of working electrode and be used to compensate hydrogen ion and the electronics that aforementioned reduction reaction consumes, and form reduction current from electronics to electrode.Reduction current is directly proportional with the percent concentration of oxygen.
Denomination of invention is that " solid polymer electrolyte, capillary type oxygen sensor ", the patent No. are that the Chinese invention patent of ZL94107055.7 has also been described a kind of electrolysis-type oxygen sensor, has also described a kind ofly with rolled-on method the waterproof and breathable diffusion electrode to be fixed on preparation method on the solid polymer electrolyte.
The content of above-mentioned patent or patented claim is included in this by reference.
Fig. 1 is a structural representation, illustration a kind of electrolysis-type oxygen sensor of prior art.As shown in Figure 1, oxygen sensor 100 comprises solid electrolyte film 110.One side of solid electrolyte film 110 is loaded with working electrode 112, and opposite side is loaded with electrode 114 and optional contrast electrode 116.Usually, working electrode 112 is designed to negative electrode, electrode 114 is designed to anode, and apply a negative bias between working electrode and contrast electrode, the current potential that is about to working electrode is arranged to be lower than the current potential of contrast electrode.Shell 120 comprises housing 122 and cap 124.As shown in Figure 1, housing 122 and cap 124 are connected with helicitic texture, in solid electrolyte film 110 and electrode 112,114 and 116 are encapsulated in.
In sensor 100, cap 124 constitutes an intake assembly with dustproof film 126 and restrictor 130.Wherein, dustproof film 126 is positioned on the cap 124, can be used to prevent that dust and other particulate pollutant from entering sensor 100 by making such as materials such as polypropylene or polyester, and protection solid electrolyte film 110 and working electrode 112 are not contaminated.Cap 124 is positioned on the restrictor 130 and has a pore 128, and pore 128 allows oxygen therefrom to pass through.Restrictor 130 has a diffusion pore 132, and pore 132 is communicated with pore 128 on the cap 124.The hole area of pore 132 and length can be controlled the rate of diffusion that oxygen arrives working electrode 112, and the rate of diffusion of oxygen can further influence oxygen in the reduction reaction rate at working electrode 112 places, the transmission of material and the measurement result of electric current.
The critical component of sensor 100 is electrolyte/electrode, and it comprises solid electrolyte film 110 and electrode 112,114 and 116.Many factors, such as the composition and the processing mode of solid electrolyte film 110, electrode 112,114 and 116 and solid electrolyte film 110 between the technique for fixing and the layout of electrode 112,114 and 116 or the like, all can influence the performance of electrolyte/electrode.For example, solid electrolyte film 110 can be made by Nafion.Electrode 112,114 and 116 can be fixed on the solid electrolyte film 110 by pressure sintering.In addition, electrode 112,114 and 116 platinum wires by sensor 110 inside (not shown) link to each other with 166 with three pins 162,164 respectively.Platinum wire can be connected on three electrodes 112,114 and 116 by the way of contact, and is welded on three pins 162,164 and 166 with conventional art.Pin 162,164 is connected externally measured electronic equipment with 166, for it provides electric current output and biasing input.
Above the solid electrolyte film 110 and/or below, ring washer 146 can also be set, be used to prevent that oxygen that enters by venthole 154 with air and the oxygen that electrolytic reaction produced from entering operating room 140.
At work, oxygen diffuses to working electrode 112 by pore 132.At working electrode 112 places, oxygen combines with electronics and hydrogen ion, and reduction reaction takes place, and forms hydrone.Reduction reaction is as shown in the formula shown in (1).
O
2+4H
++4e
-→2H
2O (1)
Formed hydrone infiltrates solid electrolyte film 110.
To electrode 114 places, hydrone is produced hydrogen ion and electronics by electrolysis.Electrolytic process is as shown in the formula shown in (2).
2H
2O→4H
++O
2+4e
- (2)
Because working electrode 112 is set to negative electrode, will be set to anode to electrode 114, so the hydrogen ion that electrolysis produces passes through solid electrolyte film 110 diffusive migrations to working electrode 112, electronics then reaches working electrode 112 by an external circuit.Alternatively, utilize a potentiostatic circuit between working electrode 112 and contrast electrode 116, to apply a negative bias, for working electrode 112 provides a negative potential.Under this current potential, oxygen is caught the electronics of external circuit, and combines with hydrogen ion from solid electrolyte film 110, and the reduction reaction shown in reaction equation (1) takes place, and forms reduction current simultaneously.Because reduction current depends on the wear rate of oxygen, so can determine the oxygen concentration concentration at working electrode 112 places by measuring reduction current.
In addition, be diffused into outside the sensor 110 by venthole 154 at the oxygen that the electrolysis of electrode 114 places is produced.
Because reaction equation (1) and (2) are balances, so the reaction in the sensor 100 is the water that the water to the electrode place is converted to working electrode 112 places, and the oxygen at working electrode 112 places is converted to oxygen to electrode 114 places.Therefore, to be otherwise known as be " oxygen pump " to this oxygen sensor.In addition, electronics is discharging electrode 114 places, and 112 places catch at working electrode.Hydrogen ion is from moving to working electrode 112 to electrode 114 by solid electrolyte film 110.
In the electrolysis-type oxygen sensor, the measuring-signal of sensor 100 is directly proportional with the oxygen concentration concentration that is diffused into working electrode 112 from pore 132.Therefore, in order to guarantee the measuring accuracy of sensor, require oxygen only to enter from pore 132.But by the structure of Fig. 1 as can be known, oxygen also may enter operating room 140 by the slit between restrictor 130 and cap 124, housing 122 and the second oxygen permeable/waterproof membrane 142.In addition, oxygen that enters by venthole 154 with air and the oxygen that electrolytic reaction produced also may enter operating room 140.These never the suitable way oxygen that arrives working electrode 122 measuring-signal of sensor 100 is increased, produce measuring error.
In order to improve the sealing of oxygen sensor, prior art is designed to helicitic texture with housing 122 and cap 124, and above the solid electrolyte film 110 and/or below be provided with ring washer 146.This thread seal structure is that revolving force is converted into pressure, has reduced the slit between each transverse interface.
But above-mentioned thread seal structure makes oxygen sensor have bigger size.The stock size of electrolysis-type oxygen sensor is the about 20.0mm of diameter, highly about 17.0mm.But,, more and more need oxygen sensor miniaturization, easy to carry on the market along with the development of commercial Application.As everyone knows, the conductivity of solid electrolyte is relevant with its liquid water content.When liquid water content descended, the conductivity of solid electrolyte also descended.The liquid water content deficiency can cause sensor failure.Therefore, when design electrolysis-type oxygen sensor, be necessary for reservoir 150 and keep certain space, to hold the material which can retain moisture of q.s.Be 20.0mm, highly be that the amount of material which can retain moisture 152 can satisfy the use needs of solid electrolyte in the reservoir 150 in the oxygen sensor of 17.0mm at the diameter that adopts above-mentioned thread seal structure.But, when needs are made the electrolysis-type oxygen sensor of smaller szie, dwindle the volume that oxygen sensor can dwindle reservoir greatly in proportion, cause the material which can retain moisture deficiency, influence the performance of sensor.
In addition, with cap 124 spiral covers to housing 122 time, reverse and squeezing action be easy to make be connected electrode 112,114 and 116 and pin 162,164 and 166 between the conduction platinum wire fracture.Simultaneously, ring washer 146 also can be shifted under twisting action, has increased sealing difficulty.
Have again, present commercial electrolysis-type oxygen sensor all is to be with the plastic plate of pore as restrictor 130, control oxygen is to the rate of propagation of working electrode, wish that restriction thus is used to characterize the size of the measurement electric current of oxygen concentration, with the electric current output constraint of oxygen sensor in a suitable scope.But when technologies such as adopting boring and laser boring adds man-hour to plastic plate, the hole tolerance of pore will reach ± 0.01mm.The inconsistent meeting in this pore aperture causes different product sensors that the gas of same concentrations is produced different signal output, causes the signal output area of sensor very big, thereby influences the consistance of product sensor to a certain extent.
In addition, electrolysis-type oxygen sensor in the market uses the Nafion film of E.I.Du Pont Company's production as the solid electrolyte in the sensor mostly.But this film can expand when suction, and linear expansivity can reach 10%-15%.Therefore, the life-span of film is shorter.Simultaneously, the electrode that the expansion of dielectric film also can cause being fixed on its both sides also deforms, thereby and even influences the stability of the stability sensor measurement of electrode reaction.In addition, the Nafion film is anisotropic, its expansivity difference on all directions, and this anisotropic expansion can cause its two lateral electrode also different in the distortion of all directions, thereby influences the serviceable life of electrode.
On the other hand, when the oxygen sensor of employing Nafion film used in the environment of drying, the Nafion film was easy to dehydration.Because the conductivity of dielectric film is very strong to the dependence of liquid water content,, thereby make the response time of sensor elongated so the dehydration meeting of Nafion film causes its conductivity to descend.Finally, sensor lost efficacy because of signal reduces.
Therefore, be desirable to provide a kind of novel oxygen sensor structure, this structure can provide good sealing property for oxygen sensor.
It would also be desirable to provide a kind of novel electrolysis-type oxygen sensor structure, this structure not only can guarantee that oxygen sensor still can effectively work under undersized situation, and can not influence its sealing in assembling process.
In addition, it would also be desirable to provide a kind of finished product consistance oxygen sensor preferably.
In addition, it would also be desirable to provide that a kind of measurement stability is good, long service life and have the good resistance dryness can the electrolysis-type oxygen sensor.
Summary of the invention
A purpose of the present utility model is that a kind of oxygen sensor of good airproof performance is provided.
Another purpose of the present utility model is that the electrolysis-type oxygen sensor of a kind of miniaturization and good airproof performance is provided.
Another purpose of the present utility model is that a kind of finished product consistance oxygen sensor preferably is provided.
Another purpose of the present utility model is, provide that a kind of measurement stability is good, long service life and have the good resistance dryness can the electrolysis-type oxygen sensor.
To achieve these goals, according to an aspect of the present utility model, provide a kind of oxygen sensor, it comprises:
Intake assembly, it comprises the restrictor that has a pore, described pore allows oxygen therefrom to pass through;
Electrolyte/electrode, it comprises electrolyte and at least one working electrode of contacting with described electrolyte and at least one is to electrode;
Housing is used to hold described intake assembly and described electrolyte/electrode;
Wherein, described restrictor has at least one insertion portion, and described housing has at least one recessed portion on the surface within it, be used to hold described at least one insertion portion of described restrictor, and the shape of described at least one recessed portion is complementary with the shape of described at least one insertion portion basically.
Oxygen sensor of the present utility model can also comprise dustproof film, and it is located immediately on the described restrictor, is used to prevent that dust from entering described oxygen sensor.
In oxygen sensor of the present utility model, described at least one insertion portion of described restrictor can be at least one projection that is positioned on the described restrictor side surface.Described at least one projection can comprise at least two discrete projections, and they are distributed on the side surface of described restrictor axisymmetrically.Preferably, described at least two discrete projections can comprise 6 projections, and they are distributed on the side surface of described restrictor in twos axisymmetrically.
In oxygen sensor of the present utility model, described at least one projection can also be a back-shaped body around the side surface of described restrictor, and described at least one recessed portion is a back-shaped body that centers on surface within the described housing.
In oxygen sensor of the present utility model, described at least one insertion portion can have a chamfering at its end towards described electrolyte/electrode.
In oxygen sensor of the present utility model, described restrictor can comprise a kapillary, and described kapillary is arranged in the pore of described restrictor, and is made by zirconia material.Preferably, the tolerance of described zirconia kapillary interior diameter is ± 0.001mm.More preferably, described interior diameter capillaceous is in the scope of 0.125 ± 0.001mm.
Oxygen sensor of the present utility model can also comprise cementing agent, and it is applied on the upper surface of described restrictor at least, is used to seal the slit between the pore of described kapillary and described restrictor.
In oxygen sensor of the present utility model, described electrolyte can be the GEFC-10N full fluorin proton exchange film, and described working electrode is positioned at a side of described GEFC-10N full fluorin proton exchange film, the described opposite side that electrode is positioned at the GEFC-10N full fluorin proton exchange film.Preferably, described GEFC-10N full fluorin proton exchange film is the GEFC-105 full fluorin proton exchange film.
Oxygen sensor of the present utility model can also comprise reservoir, and described reservoir is positioned at the described opposite side of described GEFC-10N full fluorin proton exchange film, and comprises the material which can retain moisture that discharges moisture content.Further, can also comprise: ring washer, be arranged at least one side of described GEFC-10N full fluorin proton exchange film both sides, be used to prevent that oxygen from passing through described GEFC-10N full fluorin proton exchange film and leaking.Further again, can also comprise: first oxygen permeable/waterproof membrane, it is positioned at the end of a venthole near described electrolyte/electrode, to oxygen permeable, and is used to prevent that moisture content from entering described venthole from described electrolyte/electrode inside; Glass microfiber paper, it is used for helping to regulate the humidity of described electrolyte/electrode between described reservoir and described electrolyte/electrode; With second oxygen permeable/waterproof membrane, it is positioned at the end of described kapillary near described electrolyte/electrode, to oxygen permeable, and is used to prevent that moisture content from entering described kapillary from electrolyte/electrode inside.
In the structure of oxygen sensor of the present utility model, omitted cap and between restrictor and housing, designed a bayonet arrangement.The omission of cap has reduced the height of oxygen sensor, has also dwindled the transverse width of oxygen sensor simultaneously.Like this, when needs are made undersized electrolysis-type oxygen sensor, still can hold enough material which can retain moisture, to satisfy the use needs of solid electrolyte for reservoir provides a bigger space.Simultaneously, design one bayonet arrangement can guarantee the sealing of oxygen sensor between restrictor and housing, prevent oxygen never suitable way reach working electrode.Newly-designed bayonet arrangement makes conduction platinum wire frangibility not in the sensor assembling process can not make the ring washer displacement yet.
In addition, the utility model utilizes the zirconia kapillary that oxygen diffusion is controlled.Because zirconia hole tolerance capillaceous can reach ± 0.001mm, so improved the finished product consistance of oxygen sensor.
In addition, the utility model uses the GEFC-10N full fluorin proton exchange film as dielectric film.This film isotropy and linear expansivity can reach 4%, so improved the measurement stability and the serviceable life of oxygen sensor.In addition, adopt the oxygen sensor of GEFC-10N full fluorin proton exchange film still to show good dry resistance under the environment of drying, dry resistance can double than traditional Nafion film.
Description of drawings
Fig. 1 is a structural representation, shows a kind of electrolysis-type oxygen sensor of prior art;
Fig. 2 is a front elevation, illustration the structure of electrolysis-type oxygen sensor of the utility model one embodiment;
Fig. 3 a is a vertical view, illustration the restrictor of the utility model one embodiment;
Fig. 3 b is a vertical view, illustration the restrictor of another embodiment of the utility model;
Fig. 4 is a synoptic diagram, illustration be used to make the mould of restrictor of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described.In the accompanying drawing, identical parts will be represented with identical Reference numeral.
Fig. 2 illustration the solid electrolyte oxygen sensor 200 of the utility model one embodiment.Oxygen sensor 200 comprises intake assembly, electrolyte/electrode, first and second oxygen permeable/waterproof membrane, glass microfiber paper and reservoir, wherein the structure of electrolyte/electrode, first and second oxygen permeable/waterproof membrane, glass microfiber paper and reservoir and shown in Figure 1 basic identical no longer repeats here.But the structure of the utility model intake assembly and the structure of housing are with shown in Figure 1 different.
In solid electrolyte oxygen sensor of the present utility model, shell 220 comprises housing 222, but no longer comprises cap.Intake assembly comprises dustproof film 126 and restrictor 230, and wherein dustproof film 126 is located immediately on the restrictor 230, is used to prevent that dust and other particulate pollutant from entering sensor 200, and protection solid electrolyte film 110 and working electrode 112 are not contaminated.Dustproof film 126 can be by making such as materials such as polypropylene or polyester.Restrictor 230 has at least one insertion portion 270 on its side surface.Correspondingly, on the inside surface of housing 222, have a recessed portion at least, allow insertion portion 270 to insert wherein.In order to guarantee sealing, the shape of recessed portion preferably is complementary with the shape of insertion portion basically.Insertion portion 270 can be two or more discrete projections, also can be a back-shaped body around the side surface formation of restrictor 230.Fig. 3 a is a vertical view, shows a routine restrictor 230 and has 6 discrete projections.These 6 projections are distributed on the side surface of restrictor 230 in twos axisymmetrically.Fig. 3 b shows another routine restrictor 230, and projection 270 constitutes a back-shaped body around the side surface of restrictor 230.In another embodiment, projection 270 is not set, but the whole transverse width D1 of restrictor 230 is arranged to make the recessed degree of depth of the recessed portion of housing 222 be substantially equal to (D1-D2)/2 simultaneously greater than width D 2 surperficial within the housing 222.In assembling process, can utilize the elasticity of the material of restrictor 230 and housing 222 that the insertion portion 270 of restrictor 230 is snapped in the recessed portion of housing 222.Assembling in one embodiment, is made chamfering with insertion portion 270 towards an end of working electrode 112 for convenience.Simultaneously, the recessed portion of housing 222 is made corresponding shape.
In the structure of above-mentioned oxygen sensor of the present utility model, omitted cap, and between restrictor 230 and housing 222, designed a bayonet arrangement.The omission of cap has reduced the height of oxygen sensor, has also dwindled the transverse width of oxygen sensor simultaneously.Utilize the oxygen sensor of structure fabrication stock size like this, for example diameter is 20.0mm, highly is the oxygen sensor of 17.0mm, and the volume of its reservoir 150 can reach 400 μ l.And by the oxygen sensor of the same size of prior art structure fabrication, the volume of its reservoir 150 has only 100 μ 1.As seen, the structure of the utility model oxygen sensor has increased the space proportion that reservoir 150 occupies in sensor.Therefore, when needs are made undersized solid electrolyte oxygen sensor, still can be for reservoir provides a bigger space, to hold enough material which can retain moisture.Simultaneously, design one bayonet arrangement not only can guarantee the sealing of oxygen sensor 200 between restrictor 230 and housing 222, can also reduce the probability that the conduction platinum wire fractures in the oxygen sensor assembling process, and ring washer 146 can not be shifted yet.
As previously mentioned, the hole area of pore 132 and hole length can influence the speed that oxygen arrives working electrode 112, thereby further influence the electric current that is used to characterize oxygen concentration.The size of sensor output signal is relevant with the hole area of pore and hole length.Specifically, output current I is directly proportional with hole area, is inversely proportional to hole length, i.e. I ∝ π r
2/ l, wherein r is a pore radius capillaceous, l is a hole length capillaceous.In order to reduce the variation of pore hole area, an embodiment of the present utility model has placed a zirconia ceramics kapillary 232 in restrictor 230.
The size of zirconia kapillary 232 can be bought to market on demand.In one embodiment, use the zirconia kapillary of bore dia in 0.125 ± 0.001mm scope.Because its hole tolerance has improved an order of magnitude than the hole tolerance of plastics pore, therefore the solid electrolyte oxygen sensor of making has finished product consistance preferably.
In the process of making solid electrolyte oxygen sensor of the present utility model, earlier first oxygen permeable/waterproof membrane, glass microfiber paper and electrolyte/electrode are installed in the housing 222 that has a recessed portion at least.Then, provide a restrictor 230 that has kapillary 232, this restrictor has at least one insertion portion 270, and the shape of recessed portion is complementary basically in the shape of insertion portion and the housing.Then, the insertion portion with restrictor is inserted in the recessed portion of housing.At last, direct placement one dustproof film 126 on restrictor.Preferably, can provide a chamfering 272 at an end of restrictor insertion portion, so that restrictor 230 is installed in the housing 222.
Fig. 4 is a synoptic diagram, illustration a kind of mould 400 that is used to make the utility model restrictor 230.Mould 400 comprises a main body 410 and a lid 420.Main body 410 and lid 420 can be made by aluminium alloy.The centre of main body 410 is empty, can hold the ABS plastic plate 230 of a band pore 132.Lid 220 has a projection 460 at least at its lower surface.Projection 460 can be a back-shaped body that is provided with along periphery, also can be two or more discrete projections.When lid 420 was placed on the main body 410, projection 460 can prevent that lid 420 from moving relative to main body 410.The center of lid 420 also has an aperture 450, and the interior diameter of aperture 450 is substantially equal to the overall diameter of the zirconia kapillary 232 that will insert in the plastic plate 230.In manufacturing process, the ABS plastic plate 230 that will have a pore 132 is earlier put into main body 410.Because it is identical substantially that the interior diameter of main body 410 is designed to the diameter of ABS plastic plate 230 the widest part, in the time of therefore in plastic plate 230 places main body 410, can reduce plastic plate 230 moving as much as possible relative to main body 410.Pore 132 on the plastic plate 230 can adopt technologies such as boring and laser boring to make by traditional approach, its diameter can be designed to approach the overall diameter of zirconia kapillary 232, is preferably the overall diameter that is slightly less than zirconia kapillary 232.In one embodiment, the interior diameter of pore 132 is about 2.4mm, and the overall diameter of zirconia kapillary 232 is about 2.5mm.Then, lid 420 is covered on main body 410, and make the axis of pore 132 in the centrally aligned plastic plate 230 of aperture 450 on the lid 420.Then, with a clamp clamps zirconia kapillary 232, make the axis alignment of pore 132 in its axis and the plastic plate 230, and along axis zirconia kapillary 232 is pressed in the pore 132 of plastic plate 230 by external force.When the overall diameter of zirconia kapillary 232 is slightly larger than the interior diameter of pore 132, truncated cone shape can be made in the end 470 of zirconia kapillary 232, insert in the pore 132 with convenient.In order to prevent that oxygen from entering operating room 140 from the slit between zirconia kapillary 232 and the pore 132, can be at the upper surface of plastic plate 230, apply cementing agent, for example epoxy glue around the pore 132.
In another embodiment of the present utility model, adopt the GEFC-10N full fluorin proton exchange film as solid electrolyte film 110.Preferably, use the GEFC-105 full fluorin proton exchange film.In electrolyte/electrode, working electrode and electrode is fixed on the GEFC-10N full fluorin proton exchange film by pressure sintering or print process.The GEFC-10N full fluorin proton exchange film is a series of films that are used in the fuel cell that the GEFC of Golden Energy Fuel Cell Co., Ltd. produces.This film isotropy, and linear expansivity is low.For example, at room temperature, handle, record its linear expansivity and be about 4% through immersion.Because the linear expansivity of GEFC-10N full fluorin proton exchange film has only 4%, thus the deflection of electrode reduce, and even improved the stability of the stability sensor measurement of electrode reaction.Simultaneously, because this film isotropy, so improved the serviceable life of dielectric film and electrode.In addition, the inventor finds that also this film shows good dry resistance under the environment of drying, and dry resistance can be able to double.In the experiment of a design, it is that 45 degree, relative humidity are the baking oven of 15%RH that the sensor that will have GEFC-102 film, GEFC-105 film and Nafion film is respectively put into temperature, does the dehydration accelerated tests.Experimental result shows that the out-of-service time with sensor of GEFC-102 film and GEFC-105 film is 8 days, and the out-of-service time with sensor of Nafion film is 4 days.
Although more than described preferred embodiment of the present utility model, the utility model is not limited only to this.Those skilled in the art can carry out various variations and change on basis described above.Do not break away from the various changes of invention spirit and change and all should drop within the protection domain of the present utility model.Protection domain of the present utility model is limited by appending claims.
Claims (16)
1. oxygen sensor, it comprises:
Intake assembly, it comprises the restrictor (230) that has a pore, described pore allows oxygen therefrom to pass through;
Electrolyte/electrode, it comprises electrolyte (110) and at least one working electrode (112) of contacting with described electrolyte and at least one is to electrode (114); With
Housing (222) is used to hold described intake assembly and described electrolyte/electrode;
It is characterized in that, described restrictor has at least one insertion portion (270), and described housing has at least one recessed portion on the surface within it, be used to hold described at least one insertion portion of described restrictor, and the shape of described at least one recessed portion is complementary with the shape of described at least one insertion portion basically.
2. oxygen sensor as claimed in claim 1 is characterized in that, also comprises dustproof film (126), and it is located immediately on the described restrictor, is used to prevent that dust from entering described oxygen sensor.
3. oxygen sensor as claimed in claim 1 is characterized in that, described at least one insertion portion of described restrictor is at least one projection that is positioned on the described restrictor side surface.
4. oxygen sensor as claimed in claim 3 is characterized in that, described at least one projection comprises at least two discrete projections, and they are distributed on the side surface of described restrictor axisymmetrically.
5. oxygen sensor as claimed in claim 4 is characterized in that, described at least two discrete projections comprise 6 projections, and they are distributed on the side surface of described restrictor in twos axisymmetrically.
6. oxygen sensor as claimed in claim 3 is characterized in that, described at least one projection is a back-shaped body around the side surface of described restrictor, and described at least one recessed portion is a back-shaped body that centers on surface within the described housing.
7. as claim 4 or 6 described oxygen sensors, it is characterized in that described at least one insertion portion has a chamfering (272) at its end towards described electrolyte/electrode.
8. as any one described oxygen sensor in the claim 1,4 and 6, it is characterized in that described restrictor comprises a kapillary (232), described kapillary is arranged in the pore of described restrictor, and is made by zirconia material.
9. oxygen sensor as claimed in claim 8 is characterized in that, the tolerance of described zirconia kapillary interior diameter is ± 0.001mm.
10. oxygen sensor as claimed in claim 9 is characterized in that, described interior diameter capillaceous is in the scope of 0.125 ± 0.001mm.
11. oxygen sensor as claimed in claim 8 is characterized in that, also comprises cementing agent, it is applied on the upper surface of described restrictor at least, is used to seal the slit between the pore of described kapillary and described restrictor.
12. as any one described oxygen sensor in the claim 1,4,6 and 8, it is characterized in that, described electrolyte is the GEFC-10N full fluorin proton exchange film, and described working electrode is positioned at a side of described GEFC-10N full fluorin proton exchange film, the described opposite side that electrode is positioned at the GEFC-10N full fluorin proton exchange film.
13. oxygen sensor as claimed in claim 12 is characterized in that, described GEFC-10N full fluorin proton exchange film is the GEFC-105 full fluorin proton exchange film.
14. oxygen sensor as claimed in claim 12 is characterized in that, also comprises:
Reservoir (150), described reservoir are positioned at the described opposite side of described GEFC-10N full fluorin proton exchange film, and comprise the material which can retain moisture (152) that discharges moisture content.
15. oxygen sensor as claimed in claim 14 is characterized in that, also comprises:
Ring washer (146) is arranged at least one side of described GEFC-10N full fluorin proton exchange film both sides, is used to prevent that oxygen from passing through described GEFC-10N full fluorin proton exchange film and leaking.
16. solid electrolyte oxygen sensor as claimed in claim 15 is characterized in that, also comprises:
First oxygen permeable/waterproof membrane (142), it is positioned at the end of a venthole (154) near described electrolyte/electrode, to oxygen permeable, and is used to prevent that moisture content from entering described venthole from described electrolyte/electrode inside;
Glass microfiber paper (144), it is used for helping to regulate the humidity of described electrolyte/electrode between described reservoir and described electrolyte/electrode; With
Second oxygen permeable/waterproof membrane (142), it is positioned at the end of described kapillary near described electrolyte/electrode, to oxygen permeable, and is used to prevent that moisture content from entering described kapillary from electrolyte/electrode inside.
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| CN (1) | CN201043962Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102346178A (en) * | 2010-07-26 | 2012-02-08 | 比亚迪股份有限公司 | Gas transducer seal component and an automobile oxygen sensor |
| CN101571506B (en) * | 2008-04-29 | 2016-02-24 | 华瑞科学仪器(上海)有限公司 | Formaldehyde sensor |
| CN105510396A (en) * | 2015-11-24 | 2016-04-20 | 山东科技大学 | Device and method for testing wetting range of coal seam water injection |
| CN110462104A (en) * | 2017-04-10 | 2019-11-15 | 三井金属矿业株式会社 | Solid electrolyte integrated device, the manufacturing method of solid electrolyte integrated device and solid electrolyte device |
-
2007
- 2007-01-19 CN CNU2007200664953U patent/CN201043962Y/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101571506B (en) * | 2008-04-29 | 2016-02-24 | 华瑞科学仪器(上海)有限公司 | Formaldehyde sensor |
| CN102346178A (en) * | 2010-07-26 | 2012-02-08 | 比亚迪股份有限公司 | Gas transducer seal component and an automobile oxygen sensor |
| CN105510396A (en) * | 2015-11-24 | 2016-04-20 | 山东科技大学 | Device and method for testing wetting range of coal seam water injection |
| CN110462104A (en) * | 2017-04-10 | 2019-11-15 | 三井金属矿业株式会社 | Solid electrolyte integrated device, the manufacturing method of solid electrolyte integrated device and solid electrolyte device |
| CN110462104B (en) * | 2017-04-10 | 2021-08-13 | 三井金属矿业株式会社 | Solid electrolyte integrated device, method for manufacturing solid electrolyte integrated device, and solid electrolyte device |
| US11569528B2 (en) | 2017-04-10 | 2023-01-31 | Mitsui Mining & Smelting Co., Ltd. | Solid electrolyte integrated device, method of manufacturing solid electrolyte integrated device, and solid electrolyte element |
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Assignee: Rae Klh Technologies (Beijing) Company Limited Assignor: RAE Systems (Shanghai) Inc. Contract record no.: 2010110000220 Denomination of utility model: Oxygen sensor with ceramic electrode and its preparing process Granted publication date: 20080402 License type: Exclusive License Record date: 20101230 |
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