CN102989634B - Coating device and coating method for internal catalyst layer of oxygen sensor - Google Patents
Coating device and coating method for internal catalyst layer of oxygen sensor Download PDFInfo
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- CN102989634B CN102989634B CN201210503873.5A CN201210503873A CN102989634B CN 102989634 B CN102989634 B CN 102989634B CN 201210503873 A CN201210503873 A CN 201210503873A CN 102989634 B CN102989634 B CN 102989634B
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- catalyst layer
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- compressed air
- air channel
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- 239000003054 catalyst Substances 0.000 title claims abstract description 88
- 238000000576 coating method Methods 0.000 title claims abstract description 50
- 239000011248 coating agent Substances 0.000 title claims abstract description 47
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 239000001301 oxygen Substances 0.000 title claims abstract description 34
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 34
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 72
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims abstract description 64
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 64
- 238000000034 method Methods 0.000 claims abstract description 38
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 36
- 239000011796 hollow space material Substances 0.000 claims abstract description 4
- 239000002002 slurry Substances 0.000 claims description 30
- 238000010422 painting Methods 0.000 claims description 19
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 abstract 3
- 238000007664 blowing Methods 0.000 abstract 1
- 230000001680 brushing effect Effects 0.000 description 4
- 230000003197 catalytic effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- -1 oxonium ion Chemical class 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
Abstract
The invention discloses a coating device and a coating method for an internal catalyst layer of an oxygen sensor. The coating device comprises an external sealing layer which is in close fit with the inner wall of a zirconium tube of an oxygen sensor; the coating device also comprises a compressed air channel layer which is concentric with the external sealing layer, an annular hollow space between the external sealing layer and the compressed air channel layer is a backflow channel, and a circular hollow area surrounded by the compressed air channel layer is a channel filling compressed air into the backflow channel; and the front end of the compressed air channel layer is of an open structure. According to the device and the method, platinum paste can be uniformly coated at a position on the zirconium tube of the oxygen sensor and corresponding to an external catalyst layer in a compressed air blowing mode so as to form the internal catalyst layer corresponding to the external catalyst layer; and according to the coating device and coating method disclosed by the invention, the internal catalyst layer can enable an oxygen sensor to have a good electrical property, and in the process of coating, the application amount of platinum paste is reduced, and the cost of the oxygen sensor is lowered.
Description
Technical field
The present invention relates to a kind of coating unit and method of metal level, particularly relate to a kind of coating unit and method of zirconium pipe interior catalyst layer of lambda sensor.
Background technology
The lambda sensor of automobile, its zirconium pipe orifice diameter is less, general within 5mm, oxygen sensor zirconium pipe orifice has interior catalyst layer 120, oxygen sensor zirconium pipe outer wall has external catalyst layer 110, as shown in Figure 1, interior catalyst layer 120 and external catalyst layer 110 are mainly used in the adsorption and desorption reaction of oxonium ion, for generation of oxonium ion signal.
Because the diameter of bore of oxygen sensor zirconium pipe is little, the interior catalyst layer 120 on its endoporus is difficult to coating, the interior catalyst of the following two kinds of methods coating of main employing at present layers 120.
The first, adopt brushing method, and as shown in Figure 1, the method uses writing brush to dip appropriate platinum slurry, gos deep into oxygen sensor zirconium pipe orifice bottom depths brush by feel, and the method only can by cambered surface bottom the brushing to zirconium pipe of platinum slurry.Oxygen sensor zirconium pipe inside has heater 130, and heater 130 has individual region to be hot zone, and generally, the hot zone of described heater 130 is corresponding with the position of external catalyst layer 110.Heater 130 provides the major part of heat, the position of the hot zone of heater 130 and close together corresponding with sensor external Catalytic Layer 110 position, and the speed that lambda sensor heats up can than comparatively fast, and what lambda sensor also can be the fastest enters duty.
When adopting brushing method, the platinum slurry distance hot zone of heater and the distant of external catalyst layer, oxonium ion bang path is long, sensor low-response, poor-performing.
The second, integrated injection paste-making method, as shown in Figure 2, it is inner that platinum slurry entirety is mainly filled zirconium pipe by the method, then tilted by zirconium pipe, allow platinum slurry flow out, form interior catalyst layer 120, the method can reach good sensor electrical performance, but its use amount for platinum is excessive, and cost is high.
Therefore, prior art existing defects, needs further improvement and development.
Summary of the invention
The object of this invention is to provide one can reasonable employment platinum slurry, controls lambda sensor cost, can also reach coating unit and the method for the interior catalyst layer of good sensor electrical performance.
To achieve these goals, the present invention adopts following technical scheme:
A kind of coating unit of internal catalyst layer of oxygen sensor, lambda sensor comprises the zirconium pipe with endoporus, described zirconium pipe has outside coat, wherein, described coating unit comprises can outer containment layer close-fitting with oxygen sensor zirconium inside pipe wall, and the front end of described outer containment layer is corresponding with the rear end of zirconium pipe external catalyst layer;
Described coating unit also has with the coaxial compressed air channel layer of described outer containment layer, described outer containment layer is return flow line with the annular hollow space between compressed air channel layer, and the circular hollow region that described compressed air channel layer surrounds passes into compressed-air actuated passage to described return flow line; The front end of described compressed air channel layer is hatch frame, ensures that described compressed air can through described compressed-air actuated passage, from the front opening structure inflow return flow line of compressed air channel layer.
Described coating unit, wherein, the diameter of the hatch frame of the front end of described compressed air channel layer is set to more than 2mm.
Described coating unit, wherein, the position that described compressed air channel layer is corresponding with external catalyst layer arranges equally distributed some small spaces.
Described coating unit, wherein, the diameter in described space is less than 0.3mm.
A painting method for internal catalyst layer of oxygen sensor, adopts coating unit according to claim 1, is applied to the lambda sensor comprising the zirconium pipe with endoporus, and described zirconium pipe has outside coat, specifically comprises the following steps:
One end that step 1, maintenance oxygen sensor zirconium pipe have curved bottom is downward, and platinum slurry is injected into the bottom that zirconium pipe has arc;
Step 2, be inserted in coating unit according to claim 1 in one end of the opening of oxygen sensor zirconium pipe, the outer containment layer of coating unit and zirconium inside pipe wall are closely cooperated, the front end of outer containment layer arrives the rear positions of external catalyst layer;
Step 3, the gas of specified pressure and flow is blown into compressed air channel, the platinum slurry that zirconium pipe inside is injected is blown into return flow line by air;
Step 4, form the interior catalyst layer corresponding with external catalyst layer at the inwall of described zirconium pipe orifice;
Step 5, from coating unit, take out the zirconium pipe of lambda sensor.
Described painting method, wherein, in described step 1, the platinum slurry that described zirconium pipe injects, the injection rate of platinum slurry can to cover in zirconium pipe end cambered surface and with the interior catalyst layer position corresponding to external catalyst layer.
Described painting method, wherein, in described step 3, by some small spaces equally distributed on the position that described compressed air channel layer is corresponding with external catalyst layer, the platinum at the interior catalyst layer position corresponding with external catalyst layer is brushed and is evenly coated on the interior catalyst layer of zirconium inside pipe wall.
Described painting method, wherein, in described step 3, is characterized in that, platinum slurry is also blown into by return flow line in the special container that is connected with return flow line by air.
Described painting method, wherein, in described step 3, the diameter in described space is less than 0.3mm.
The coating unit of a kind of internal catalyst layer of oxygen sensor provided by the invention and method, the mode can brushed by compressed air, platinum slurry is evenly coated on the oxygen sensor zirconium pipe position corresponding with external catalyst layer, forms the interior catalyst layer corresponding with external catalyst layer; Described coating unit and painting method, the interior catalyst layer of formation can make lambda sensor have good electrical property, and coating procedure decreases the use amount to platinum slurry, reduces the cost of lambda sensor.
Accompanying drawing explanation
Fig. 1 is when adopting brushing method under prior art, the structural representation of oxygen sensor zirconium pipe interior catalyst layer;
Fig. 2 is when adopting integrated injection paste-making method under prior art, the structural representation of oxygen sensor zirconium pipe interior catalyst layer;
When Fig. 3 is for employing painting method of the present invention, the structural representation of oxygen sensor zirconium pipe interior catalyst layer;
When Fig. 4 is for employing painting method of the present invention, the structural representation of oxygen sensor zirconium pipe interior catalyst layer and the second electrode;
Fig. 5 is the structural representation of coating unit of the present invention;
Fig. 6 is that coating unit A of the present invention is to the enlarged drawing being longitudinal section;
Fig. 7 is the structural representation in the space that compressed air channel layer is arranged coating unit of the present invention.
Detailed description of the invention
Below in conjunction with preferred embodiment, the present invention is described in further details.
The coating unit of a kind of internal catalyst layer of oxygen sensor provided of the present invention, as shown in Figure 5, comprising can outer containment layer 210 close-fitting with zirconium inside pipe wall, the front end 211 of described outer containment layer 210 limits the rear positions of interior catalyst layer 120, and namely the front end of described outer containment layer 210 is corresponding with the rear end of zirconium pipe external catalyst layer 110, as shown in Figure 5, define the left end of described outer containment layer 210 for its front end, the right-hand member defining described external catalyst layer 110 and interior catalyst layer 120 is its rear end, the left end of described external catalyst layer 110 and interior catalyst layer 120 is its front end: described coating unit has with the coaxial compressed air channel layer 220 of described outer containment layer 210, described outer containment layer 210 is return flow line 230 with the annular hollow space between compressed air channel layer 220, the circular hollow region that described compressed air channel layer 220 surrounds passes into compressed-air actuated passage to described return flow line 230, the front end of described compressed air channel layer 220 is hatch frames, ensures that described compressed air can the passage of compressed air, from the front opening structure inflow return flow line 230 of compressed air channel layer 220 like this, the present invention defines, and as shown in Figure 5, the left end of described compressed air channel layer 220 is the front end of compressed air channel layer.
Further, the diameter D of the hatch frame of the front end of described compressed air channel layer 220, can be set to more than 2mm, as shown in Figure 6, to ensure enough air-flows, the platinum slurry in cambered surface bottom zirconium pipe is blown into return flow line 230.
Another one preferred embodiment, as shown in Figure 7, the position that described compressed air channel layer 220 is corresponding with external catalyst layer 110 is arranged equally distributed some small spaces 221, its space 221 diameter D1 should be less than 0.3mm, the setting in described space, ensuring appropriate air evenly dispels distribution by the platinum slurry being gathered in interior catalyst layer 120 position on the one hand, ensures that interior catalyst layer 120 has certain Catalytic Layer thickness on the other hand.
The painting method of the interior catalyst layer of a kind of oxygen sensor zirconium pipe provided by the invention, comprises the following steps:
One end that step 1, maintenance oxygen sensor zirconium pipe have curved bottom is downward, by the facility of various controlled injection rate, platinum slurry is injected into the bottom that zirconium pipe has arc, require injection rate can cover cambered surface of the interior end and with the interior catalyst layer position corresponding to external catalyst layer, after namely platinum slurry injects, the horizontal plane of platinum slurry is consistent with the rear end of described external catalyst layer.
Step 2, be inserted in described coating unit in one end of the opening of oxygen sensor zirconium pipe, the outer containment layer 210 of coating unit is closely cooperated with zirconium inside pipe wall, and the front end of outer containment layer 210 arrives the rear positions of external catalyst layer 110;
Step 3, the gas of specified pressure and flow is blown into compressed-air actuated passage, the platinum slurry that zirconium pipe inside is injected is blown into return flow line 230 by air, and in the special container be connected with return flow line 230.
Step 4, form the interior catalyst layer 120 corresponding with external catalyst layer 110 at the inwall of described zirconium pipe orifice, as shown in Figure 3.
Step 5, from coating unit, take out the zirconium pipe of lambda sensor.
Interior catalyst layer 120 painting method of the present invention, can be blown into the platinum slurry in the cambered surface bottom zirconium pipe in return flow line 230, and platinum slurry only can be back in special container by this return flow line, so that reuse.
Painting method of the present invention, further, can also be in step 3, by some small spaces 221 equally distributed on the position that described compressed air channel layer 220 is corresponding with external catalyst layer 110, being brushed by the platinum at interior catalyst layer 120 position corresponding to external catalyst layer 110 is evenly coated on the interior catalyst layer 120 of zirconium inside pipe wall, avoid the accumulation of platinum slurry, platinum slurry is uniformly distributed.The present invention can by the THICKNESS CONTROL of interior catalyst layer 120 at 20 ~ 50um, and finished product needs to detect conducting resistance and is less than 3 ohm.
The zirconium pipe of the lambda sensor utilizing coating unit of the present invention and painting method to complete, as shown in Figure 4, can interior catalyst layer 120 be set on the position corresponding with external catalyst layer 110, outside Catalytic Layer 110 is drawn the first electrode 140, interior catalyst layer is drawn the second electrode 150.Interior catalyst layer 120 and external catalyst layer 110 are mainly used in the adsorption and desorption reaction of oxonium ion, for generation of oxonium ion signal.The second electrode 150 that its interior catalyst layer 120 is drawn and the first electrode 140 that external catalyst layer 110 is drawn: the transmission being mainly used in voltage signal.
The coating unit of internal catalyst layer of oxygen sensor provided by the invention and painting method, the mode can brushed by compressed air, platinum slurry is evenly coated on the oxygen sensor zirconium pipe position corresponding with external catalyst layer, forms the interior catalyst layer corresponding with external catalyst layer; Described coating unit and painting method, the interior catalyst layer of formation can make lambda sensor have good electrical property, and coating procedure decreases the use amount to platinum slurry, reduces the cost of lambda sensor.
Above content is the explanation to preferred embodiment of the present invention, and those skilled in the art can be helped to understand technical scheme of the present invention more fully.But these embodiments only illustrate, can not assert that the specific embodiment of the present invention is only limitted to the explanation of these embodiments.Concerning general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deductions and conversion can also be made, all should be considered as belonging to protection scope of the present invention.
Claims (9)
1. the coating unit of an internal catalyst layer of oxygen sensor, lambda sensor comprises the zirconium pipe with endoporus, described zirconium pipe has outside coat, it is characterized in that, described coating unit comprises can outer containment layer close-fitting with oxygen sensor zirconium inside pipe wall, and the front end of described outer containment layer is corresponding with the rear end of zirconium pipe external catalyst layer;
Described coating unit also has with the coaxial compressed air channel layer of described outer containment layer, described outer containment layer is return flow line with the annular hollow space between compressed air channel layer, and the circular hollow region that described compressed air channel layer surrounds passes into compressed-air actuated passage to described return flow line; The front end of described compressed air channel layer is hatch frame, ensures that described compressed air can through described compressed-air actuated passage, from the front opening structure inflow return flow line of compressed air channel layer.
2. coating unit according to claim 1, is characterized in that, the diameter of the hatch frame of the front end of described compressed air channel layer is set to more than 2mm.
3. coating unit according to claim 2, is characterized in that, the position that described compressed air channel layer is corresponding with external catalyst layer arranges equally distributed some small spaces.
4. coating unit according to claim 3, is characterized in that, the diameter in described space is less than 0.3mm.
5. a painting method for internal catalyst layer of oxygen sensor, adopts coating unit according to claim 1, is applied to the lambda sensor comprising the zirconium pipe with endoporus, and described zirconium pipe has outside coat, specifically comprises the following steps:
One end that step 1, maintenance oxygen sensor zirconium pipe have curved bottom is downward, and platinum slurry is injected into the bottom that zirconium pipe has arc;
Step 2, be inserted in coating unit according to claim 1 in one end of the opening of oxygen sensor zirconium pipe, the outer containment layer of coating unit and zirconium inside pipe wall are closely cooperated, the front end of outer containment layer arrives the rear positions of external catalyst layer;
Step 3, the gas of specified pressure and flow is blown into compressed air channel, the platinum slurry that zirconium pipe inside is injected is blown into return flow line by air;
Step 4, form the interior catalyst layer corresponding with external catalyst layer at the inwall of described zirconium pipe orifice;
Step 5, from coating unit, take out the zirconium pipe of lambda sensor.
6. painting method according to claim 5, is characterized in that, in described step 1, the platinum slurry that described zirconium pipe injects, the injection rate of platinum slurry can to cover in zirconium pipe end cambered surface and with the interior catalyst layer position corresponding to external catalyst layer.
7. painting method according to claim 6, it is characterized in that, in described step 3, by some small spaces equally distributed on the position that described compressed air channel layer is corresponding with external catalyst layer, the platinum at the interior catalyst layer position corresponding with external catalyst layer is brushed and is evenly coated on the interior catalyst layer of zirconium inside pipe wall.
8. painting method according to claim 7, is characterized in that, in described step 3, it is characterized in that, platinum slurry is also blown into by return flow line in the special container that is connected with return flow line by air.
9. painting method according to claim 8, is characterized in that, in described step 3, the diameter in described space is less than 0.3mm.
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| CN201210503873.5A CN102989634B (en) | 2012-12-02 | 2012-12-02 | Coating device and coating method for internal catalyst layer of oxygen sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210503873.5A CN102989634B (en) | 2012-12-02 | 2012-12-02 | Coating device and coating method for internal catalyst layer of oxygen sensor |
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| CN102989634A CN102989634A (en) | 2013-03-27 |
| CN102989634B true CN102989634B (en) | 2015-07-15 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111122678B (en) * | 2020-01-10 | 2023-01-03 | 保定东瑞汽车电子科技有限公司 | Vehicle oxygen sensor with fast response and strong anti-interference capability |
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|---|---|---|---|---|
| US4264647A (en) * | 1979-04-17 | 1981-04-28 | General Motors Corporation | Reference electrode printing process and mask for exhaust gas oxygen sensor |
| US5202157A (en) * | 1990-08-28 | 1993-04-13 | Mitsui Petrochemical Industries, Ltd. | Method for lining internal surfaces of pipelines |
| CN102039262A (en) * | 2010-12-31 | 2011-05-04 | 上海众人网络安全技术有限公司 | Glue pouring electronic token and glue pouring process method |
| CN102608192A (en) * | 2012-03-12 | 2012-07-25 | 惠州市富济电子材料有限公司 | Tubular oxygen sensor and preparation method for same |
| CN102671827A (en) * | 2012-05-18 | 2012-09-19 | 苏州源申涂装净化设备有限公司 | Inner coating device capable of being used for hanging and conveying coating line |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5971832A (en) * | 1982-10-19 | 1984-04-23 | Toyo Seikan Kaisha Ltd | Paint film-coated parison and manufacture thereof |
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- 2012-12-02 CN CN201210503873.5A patent/CN102989634B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4264647A (en) * | 1979-04-17 | 1981-04-28 | General Motors Corporation | Reference electrode printing process and mask for exhaust gas oxygen sensor |
| US5202157A (en) * | 1990-08-28 | 1993-04-13 | Mitsui Petrochemical Industries, Ltd. | Method for lining internal surfaces of pipelines |
| CN102039262A (en) * | 2010-12-31 | 2011-05-04 | 上海众人网络安全技术有限公司 | Glue pouring electronic token and glue pouring process method |
| CN102608192A (en) * | 2012-03-12 | 2012-07-25 | 惠州市富济电子材料有限公司 | Tubular oxygen sensor and preparation method for same |
| CN102671827A (en) * | 2012-05-18 | 2012-09-19 | 苏州源申涂装净化设备有限公司 | Inner coating device capable of being used for hanging and conveying coating line |
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