CN210401286U - Crack detection device for ceramic element of gas sensor - Google Patents
Crack detection device for ceramic element of gas sensor Download PDFInfo
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- CN210401286U CN210401286U CN201921300975.0U CN201921300975U CN210401286U CN 210401286 U CN210401286 U CN 210401286U CN 201921300975 U CN201921300975 U CN 201921300975U CN 210401286 U CN210401286 U CN 210401286U
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Abstract
The utility model provides a gas sensor ceramic element's crackle detection device, it includes: a support assembly having an element positioning slot; the two heating side contact elastic sheets are arranged in the element positioning grooves and can be in contact with the heater pins of the ceramic element of the gas sensor to be detected through elasticity; the two electrode side contact elastic sheets are arranged in the element positioning groove and can be in contact with the electrode pins of the ceramic element of the gas sensor to be detected through elasticity; the elastic piece fixing block is arranged on the side edge of the element positioning groove and is fixedly connected with the heating side contact elastic piece and the electrode side contact elastic piece; and the elastic piece leading-out wire harness is provided with one end penetrating through the support component and electrically connected with the heating side contact elastic piece and the electrode side contact elastic piece, and the other end is led out of the support component. The utility model discloses a detection device can be used to the detection to the crackle that sensor ceramic element produced in preparation process and assembling process, fills this technical blank.
Description
Technical Field
The utility model relates to a detection apparatus for ceramic crackle can effectively select separately to the inside crackle that gas sensor ceramic element produced in preparation and assembling process.
Background
The gas sensor is one of ceramic products, belongs to functional ceramics, and is widely applied to the fields of automobile exhaust emission, medical treatment, household appliances, food packaging and the like. Such a gas sensor uses a zirconia electrolyte as a carrier for transporting oxygen ions, and can realize accurate measurement of oxygen content in various fields. Fig. 1 is a schematic cross-sectional view of a conventional gas sensor assembly, which includes a mounting housing 1 ', a front ceramic part 2 ', a rear ceramic part 3 ', a sealing ring 4 ', a sensor ceramic element 5 ', a front outer protective housing 6 ', and a front inner protective housing 7 ', wherein the front end ceramic piece 2 ' and the rear end ceramic piece 3 ' are arranged in the mounting shell 1 ' in tandem, and is connected by a sealing ring 4 ', a sensor ceramic element 5 ' is sequentially arranged through the front end ceramic piece 2 ', the sealing ring 4 ' and the rear end ceramic piece 3 ', the front end of the sensor ceramic element 5 'is encapsulated by the front end outer protective shell 6' and the front end inner protective shell 7 ', the rear end thereof protrudes out of the rear end ceramic piece 3', and the electrode pin 523 'and the heater pin 542' of the sensor ceramic element 5 'are exposed to the surface of the rear end portion of the sensor ceramic element 5'.
However, since the sensor ceramic elements are all formed by high-temperature firing, cracks may be generated in the product due to stress changes inside the product during cooling. In addition, in the assembly process of the ceramic element, fine cracks are generated in the ceramic element under the action of external pressure.
As shown in fig. 2 and 3, the gas sensor ceramic element 5 'includes a substrate layer 51', a solid electrolyte layer 52 'and a porous protection layer 53' from bottom to top, the outer surface of the solid electrolyte layer 52 'is provided with an outer electrode 521', the inner surface is provided with an inner electrode 522 ', the outer electrode 521' and the inner electrode 522 'are connected with an external power supply U through an electrode pin 523', the lower part of the substrate layer 51 'is further provided with a heater substrate layer 56', the heater substrate layer 56 'is further provided with a heater 54', the heater 54 'is connected with an external power supply Uh through a heater pin 542', wherein the gas sensor ceramic element 5 'is provided with a gas channel 55', the gas channel is positioned between the substrate layer 51 'and the solid electrolyte layer 52' and is a cavity with one end communicated with air, and cracks are more easily generated due to internal stress changes when the gas channel is positioned between two layers of materials during high-temperature firing, as shown in fig. 7, the crack W is likely to occur at a position near the gas duct 55'. However, during the assembly process, as shown in fig. 1, the sensor ceramic element 5 'is subjected to an external pressure, and cracks W are likely to occur at the contact position with the seal ring 4' and penetrate the gas passage 55 'of the sensor ceramic element 5'. The cracks generated at the gas passage 55' are fatal defects, and directly affect the implementation of the gas sensor function.
Cracks are generally classified into two types: firstly, the cracks are obvious and can be identified and then eliminated by visual inspection; secondly, the internal structure of the sensor ceramic element has dark cracks which are not easy to be found, the poor product with the cracks can cause that the electric signal can not be normally output, thus the gas content can not be accurately measured, and even the poor product is easy to break under the action of external force, thus leading to customer complaints.
In addition, in the assembly process, the contact is not influenced by fine cracks generated inside the ceramic element of the sensor, so that the crack products cannot be selected by detecting the electrical connectivity, and once the crack products flow into a client, the fine cracks can be further enlarged after the client uses for a period of time, so that the gas sensor cannot normally detect the oxygen content and further leads to customer complaints.
The existing crack detection device is mainly applied to the fields of highway pavements, metal cracks, metal plate bending, glass, crystal chips and the like, but related technical reports applied to crack detection of ceramic elements are few.
Disclosure of Invention
The to-be-solved technical problem of the utility model lies in providing a ceramic element's crackle detection device, can be used to the detection to the crackle that sensor ceramic element produced in preparation process and assembling process, fill this technical blank.
The utility model discloses a realize like this: a crack detection device of a gas sensor ceramic element, comprising:
a support assembly having an element positioning slot;
the two heating side contact elastic sheets are arranged in the element positioning grooves and can be in contact with the heater pins of the ceramic element of the gas sensor to be detected through elasticity;
the two electrode side contact elastic sheets are arranged in the element positioning groove and can be in contact with the electrode pins of the ceramic element of the gas sensor to be detected through elasticity;
the elastic piece fixing block is arranged on the side edge of the element positioning groove and is fixedly connected with the heating side contact elastic piece and the electrode side contact elastic piece; and
and one end of the elastic sheet leading-out wire harness penetrates through the support assembly and is electrically connected with the heating side contact elastic sheet and the electrode side contact elastic sheet, and the other end of the elastic sheet leading-out wire harness is led out of the support assembly.
Furthermore, two heating side contact elastic sheets and two electrode side contact elastic sheets are arranged in pairs in an opposite mode, the inner ends of the two heating side contact elastic sheets are straight ends and are connected with the elastic sheet leading-out wire harness, the outer ends of the two heating side contact elastic sheets are provided with arc-shaped elastic parts, and elastic automatic clamping detection positions are formed among the elastic parts.
Furthermore, the supporting component comprises an upper cover and a lower cover, the upper cover and the lower cover are detachably connected, the lower cover is further provided with a wire harness guiding part, the heating side contacts with the elastic sheet and the electrode side contacts with the arc elastic part of the elastic sheet, the arc elastic part is located in the upper cover, the straight end is located in the lower cover, and the elastic sheet leads out the wire harness which extends out of the wire harness guiding part.
Further, the utility model discloses a detection device still includes: the two ends of the direct current voltage stabilization source are respectively connected with the heater and the electrode elastic piece lead-out wire harness to provide power for a heater electrode of the sensor ceramic element so as to form a detection circuit;
and the current detector is connected in series with the detection circuit on the electrode side.
The utility model has the advantages that: the utility model discloses a crack detection device establishes heating side contact shell fragment and electrode side contact shell fragment through adding in the component constant head tank to the heater pin and the electrode pin are led to the electric conductance simultaneously at the centre gripping by gas sensor ceramic element's in-process, can draw the pencil external power source through the shell fragment and detect, because elastic fixation, to being installed and removed operation convenient and fast very much by the gas sensor ceramic element that is surveyed, because the testing process only needs fixed and switches on the pin tip by gas sensor ceramic element, pin tip all is the free end at sensor ceramic element at preparation process and assembling process, consequently the utility model discloses a crack detection device not only can be used to carry out crackle on-line measuring at the preparation to sensor ceramic element, also can carry out crackle on-line measuring at sensor ceramic element's assembling process.
Drawings
The invention will be further described with reference to the following examples with reference to the accompanying drawings.
Fig. 1 is a schematic cross-sectional view of a conventional gas sensor assembly.
Fig. 2 is an exploded view of a ceramic element of a conventional gas sensor.
Fig. 3 is a schematic diagram illustrating the operation principle of oxygen transmission of a ceramic element of a conventional gas sensor.
Fig. 4 is the external overall structure schematic diagram of the crack detection device of the present invention.
Fig. 5 is an axial sectional structural schematic diagram of the crack detection device of the present invention.
Fig. 6 is a schematic structural diagram of a detection state of the crack detection device of the present invention.
Fig. 7 is a schematic structural diagram of another detection state of the crack detection device according to the present invention.
Detailed Description
Referring to fig. 4 and 5, the crack detection device 100 of the gas sensor ceramic element of the present invention includes a supporting component 1, two heating sides contacting with an elastic sheet 2, two electrode sides contacting with an elastic sheet 3, an elastic sheet fixing block 4, and an elastic sheet leading-out wire harness 5. Wherein the content of the first and second substances,
the supporting component 1 is provided with a component positioning groove 10;
the two heating side contact elastic sheets 2 are arranged in the element positioning groove and can be in contact with the heater pin of the ceramic element of the gas sensor to be detected through elasticity;
the two electrode side contact elastic sheets 3 are arranged in the element positioning groove and can be in contact with the electrode pins of the ceramic element of the gas sensor to be detected through elasticity;
the elastic piece fixing block 4 is arranged on the side edge of the element positioning groove and is fixedly connected with the heating side contact elastic piece and the electrode side contact elastic piece; and
one end of the elastic piece leading-out wire harness 5 penetrates through the supporting assembly and is electrically connected with the heating side contact elastic piece and the electrode side contact elastic piece, and the other end of the elastic piece leading-out wire harness 5 is led out of the supporting assembly.
Specifically, two heating side contact shell fragment 2 and two electrode side contact shell fragment 3 are two liang of relative arrangements, and the inner is straight end 21, 31, and connects shell fragment extraction pencil 5, and the outer end has arc elasticity portion 22, 32, forms an automatic centre gripping of elasticity between each elasticity portion and detects position 6.
The supporting component 1 comprises an upper cover 11 and a lower cover 12, the upper cover 11 and the lower cover 12 are detachably connected, the lower cover 12 is further provided with a wire harness guiding part 122, two heating side contact elastic sheets 2 and two arc elastic parts of electrode side contact elastic sheets 3 are both positioned in the upper cover 11, straight ends are positioned in the lower cover 12, and the elastic sheets lead out a wire harness 5 to stretch out of the wire harness guiding part 122.
Utilize the utility model discloses a crack detection device detects preceding to gas sensor ceramic element, will connect the shell fragment extraction pencil 5 that two heating side contacted shell fragment 2 earlier and be connected with outside power Uh, will connect the shell fragment extraction pencil 5 that two electrode side contacted shell fragment 3 and be connected with outside power U, for being surveyed gas sensor ceramic element's heater and electrode power supply to concatenate a current detector in electrode side detection loop, can detect.
The specific detection steps are as follows:
(1) placing the gas sensor ceramic element to be detected into the element positioning groove to ensure that the heating side contact elastic sheet 2 and the electrode side contact elastic sheet 3 are in good contact with the heater pin and the electrode pin of the gas sensor ceramic element to be detected respectively;
(2) applying 12V-14V direct current voltage Uh to the heater end to heat the solid electrolyte layer for about 1min, so that the solid electrolyte layer reaches the normal working temperature of about 800 ℃ and is in a stable state;
(3) after heating for 1min, loading a 0.3V-0.6V direct current voltage U on the electrode side, connecting the positive electrode of a power supply with an outer electrode pin, connecting the negative electrode with an inner electrode pin, wherein the current direction is from the outer electrode to the inner electrode, the transmission direction of oxygen ions is from the inner electrode to the outer electrode, and the voltage on the electrode side is not too high, so that oxygen supply in an air passage is seriously insufficient, oxygen in the solid electrolyte is consumed, and the solid electrolyte cannot normally work;
(4) collecting current I in an electrode side loop of the ceramic element after the voltage on the electrode side is loaded for 30-50 s, because oxygen stored in the air passage is consumed when the voltage on the electrode side is loaded, the current formed in the electrode side loop fluctuates greatly, the value cannot reflect the real size of the air passage, the current value reaches a stable state after about 30s, and the collected current value is an effective limit current value which reflects the size of the air passage;
(5) theory I of limiting current calculation from design size of airwaypValue if test value I>Theoretical value IpIf the cross section area of the air duct is increased, the air duct is judged to be a crack product, otherwise, the air duct is not the crack product.
(6) After the test is finished, the gas sensor ceramic element is manually pulled out after being cooled.
As shown in fig. 6 and 7, the detection principle of the present invention is:
the cross-sectional area A and the length L of the gas channel 55 ' determine the gas inlet amount, so that the oxygen ion transmission amount from the inner electrode 522 ' to the outer electrode 521 ' is limited, and when a certain voltage U is applied to two sides of the electrodes, a limiting current I is formed between the two electrodespThe limit current value reflects the amount of oxygen entering the gas passage, and its magnitude depends on the size of the gas passage 55'. Limiting current I according to gas diffusionpThe formula is as follows:
Ip＝C·A/L(PO2’-PO2”)，
in the formula, C is a gas diffusion constant, A is a cross section area of an air passage, L is a length of the air passage, PO2 'is an oxygen partial pressure outside the air passage, PO 2' is an oxygen partial pressure inside the air passage close to the inner electrode side, and when a limiting current I is formedPIn this case, the value of PO2 ″ is close to zero. The detection devices of the present invention were all performed in an air atmosphere, that is, PO2 'was a partial pressure in air, and a value of the gas diffusion constant C in the air atmosphere was calculated by actual measurement, and the result of the actual measurement was C · PO 2' ═ 150 mA/mm. Therefore, the limiting current I is in the air atmospherepThe formula can be written as:
Ip＝150*A/L。
according to the limit current formula under the air atmosphere, when the size of the air passage is fixed, IpAnd should also be relatively fixed. If the product has cracks at the position of the air passage, the oxygen inlet amount is increased, namely the sectional area A of the air passage is increased, and the detected I ispThe value is larger than that of a product without cracks, and the difference can be used for judging IpAnd sorting out crack products according to the value. The oxygen transmission diagram of the cracked product is shown in fig. 7, and if the product has no cracks, the oxygen transmission diagram is shown in fig. 6.
Although specific embodiments of the present invention have been described, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the claims appended hereto.
Claims (3)
1. A crack detection device for a gas sensor ceramic element, characterized in that: the method comprises the following steps:
a support assembly having an element positioning slot;
the two heating side contact elastic sheets are arranged in the element positioning grooves and can be in contact with the heater pins of the ceramic element of the gas sensor to be detected through elasticity;
the two electrode side contact elastic sheets are arranged in the element positioning groove and can be in contact with the electrode pins of the ceramic element of the gas sensor to be detected through elasticity;
the elastic piece fixing block is arranged on the side edge of the element positioning groove and is fixedly connected with the heating side contact elastic piece and the electrode side contact elastic piece; and
and one end of the elastic sheet leading-out wire harness penetrates through the support assembly and is electrically connected with the heating side contact elastic sheet and the electrode side contact elastic sheet, and the other end of the elastic sheet leading-out wire harness is led out of the support assembly.
2. A crack detecting device of a gas sensor ceramic element as set forth in claim 1, wherein: the two heating side contact elastic sheets and the two electrode side contact elastic sheets are arranged in pairs in an opposite mode, the inner ends of the two heating side contact elastic sheets are straight ends and are connected with the elastic sheet leading-out wire harness, the outer ends of the two heating side contact elastic sheets are provided with arc-shaped elastic parts, and elastic automatic clamping detection positions are formed among the elastic parts.
3. A crack detecting device of a gas sensor ceramic element as set forth in claim 1, wherein: the supporting component comprises an upper cover and a lower cover, the upper cover and the lower cover are detachably connected, the lower cover is further provided with a wire harness guiding part, the heating side contacts with the elastic sheet and the electrode side contacts with the arc elastic part of the elastic sheet, the arc elastic part is located in the upper cover, the straight end is located in the lower cover, and the elastic sheet leads out a wire harness which extends out of the wire harness guiding part.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921300975.0U CN210401286U (en) | 2019-08-12 | 2019-08-12 | Crack detection device for ceramic element of gas sensor |
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| CN201921300975.0U CN210401286U (en) | 2019-08-12 | 2019-08-12 | Crack detection device for ceramic element of gas sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112326734A (en) * | 2020-09-22 | 2021-02-05 | 凯晟动力技术（嘉兴）有限公司 | Method for detecting cracks of zirconium piece of oxygen sensor |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112326734A (en) * | 2020-09-22 | 2021-02-05 | 凯晟动力技术（嘉兴）有限公司 | Method for detecting cracks of zirconium piece of oxygen sensor |
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