CN205426827U - Heat -conduction formula concentration detection mechanism and urea case level sensor - Google Patents
Heat -conduction formula concentration detection mechanism and urea case level sensor Download PDFInfo
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- CN205426827U CN205426827U CN201620189981.3U CN201620189981U CN205426827U CN 205426827 U CN205426827 U CN 205426827U CN 201620189981 U CN201620189981 U CN 201620189981U CN 205426827 U CN205426827 U CN 205426827U
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- detection sensor
- conductivity concentration
- concentration detection
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Abstract
The utility model discloses a heat -conduction formula concentration detection mechanism, treat the heating device of tracer liquid including being used for heating, and be used for detecting treat the heat -conduction formula concentration detection sensor of the quality of tracer liquid, heat -conduction concentration detection sensor's week portion is provided with even heating device. Still disclose its urea case level sensor of an application for need the urea case level sensor who uses can adopt heat -conduction formula concentration detection sensor to carry out urea concentration measurement under the low temperature heating environment, measurement accuracy is high, and test effectiveness can not receive the influence of thermal shock.
Description
Technical field
This utility model relates to SCR technical field, is specifically related to urea quality detecting system, particularly relates to a kind of thermal conductivity concentration detecting mechanism.
Background technology
Along with state four standard and the integral implementation of more maximum discharge standard, all heavy-duty commercial vehicles must install the exhaust aftertreatment devices of SCR system or equivalent, and current overwhelming majority depot preferentially uses selective catalytic reduction system operating-SCR system, thus must use carbamide.Urea for vehicle solution must assure that just sufficiently can be converted into nitrogen and water in certain concentration range by oxide, and excessive concentration can bring NH3Secondary pollution, concentration is too low, does not reaches discharge standard requirement, and uses tap water, sea water based on deception or add other solvents such as diesel oil by mistake the after-treatment system of unit up to ten thousand possibly even can be caused damaged.Along with the compulsory execution of OBD onboard diagnostic system, in the case of or urea quality concentration the most up to standard in discharge is undesirable, vehicle can be turned round by limit, even limits startup.Therefore along with the enforcement of external Europe six discharge standard, quality sensor becomes solar obligation parts.Based on above-mentioned situation, the accuracy of detection carbamide quality in urea liquid is extremely important.
SCR system utilizes urea liquid catalytic reduction of NOx；High-quality urea tank liquid level sensor is diesel vehicle SCR system Aided design, nitrogen oxides (NOx) is carried out SCR, thus reach the most energy-conservation, but also the purpose that reduces discharging, this technology is Europe mainstream technology route, and European long-distance load-carrying vehicle and motorbus almost all use this technology.Container as aqueous solution of urea is referred to as urea box, and urea box of the prior art is provided with liquid level sensor, utilizes this liquid level sensor on the one hand urea liquid sucking-off on the other hand can be monitored the liquid level of the urea liquid in urea box.
Not only it should be understood that liquid level in urea box in SCR system, in addition it is also necessary to detecting the concentration of carbamide, the most conventional urea concentration sensor, when there is bubble and impurity in carbamide, Detection results is not ideal enough.
In view of the foregoing, propose a kind of method using thermal conductivity concentration detection sensor that urea concentration is detected, detect urea concentration according to the carbamide heat transfer efficiency difference of variable concentrations.
Thermal conductivity concentration detection sensor can use (low temperature, room temperature, high temperature) under temperature constant state, however it is necessary that and carries out when temperature plateau heats, so its work process is affected extremely serious by temperature shock.
But owing to urea liquid is easier to freeze, urea liquid after icing cannot be sucked out, therefore after carbamide freezes at low temperatures, in order to enable normally to export urea liquid, need to input coolant to thaw, currently for this problem, heater it is equipped with in urea box, utilize heater that urea liquid is heated, prevent icing of urea solution, coolant enters when adding heat pipe, temperature moment rises, now, the temperature risen forms a temperature shock with the temperature of concentration monitoring device itself, temperature rises the most suddenly, just can not read the urea concentration of reality, the accuracy of Concentration Testing result can be had a strong impact on.
Utility model content
A purpose of the present utility model is: provide a kind of thermal conductivity concentration detecting mechanism, and it can slow down the heat diffusion velocity of this position, reduces the impact caused variations in temperature during Urea to Concentration Testing soon.
Another purpose of the present utility model is: provide a kind of thermal conductivity concentration detecting mechanism, urea temperature change around its thermal conductivity concentration detection sensor uniformly, reduces the Urea process uneven impact causing Concentration Testing of thermal conductivity concentration detection sensor environment temperature.
Another purpose of the present utility model is: providing a kind of liquid level sensor of urea box, have the function of Level Detection, Concentration Testing simultaneously, accuracy of detection is high, it is possible to ensure effective utilization of carbamide.
For reaching above-mentioned purpose, this utility model by the following technical solutions:
On the one hand, a kind of thermal conductivity concentration detecting mechanism is provided, including the heater for heating liquid to be detected, and for detecting the thermal conductivity concentration detection sensor of the quality of described liquid to be detected, the perimembranous of described thermal conductivity concentration detection sensor is provided with the device for homogenous heating that the heat distributed for slowing down described heater diffuses to the speed of described thermal conductivity concentration detection sensor.
As a kind of optimal technical scheme of described thermal conductivity concentration detecting mechanism, described device for homogenous heating is the heat-barrier material being arranged on the described heater bringing-up section corresponding with described thermal conductivity concentration detection sensor.
A kind of optimal technical scheme as described thermal conductivity concentration detecting mechanism, described heater for adding heat pipe, described in add the heat pipe bringing-up section corresponding with described thermal conductivity concentration detection sensor and arrange in the shape of a spiral around described thermal conductivity concentration detection sensor.
As a kind of optimal technical scheme of described thermal conductivity concentration detecting mechanism, described in add the beeline between each position and the described thermal conductivity concentration detection sensor of the heat pipe bringing-up section corresponding with described thermal conductivity concentration detection sensor identical.
As a kind of optimal technical scheme of described thermal conductivity concentration detecting mechanism, described heat-barrier material be arranged on described in add tube surface, and add the heat pipe side near described thermal conductivity concentration detection sensor described in being positioned at；Or, described heat-barrier material be arranged on described in add the thermal sleeve of tube surface；And/or, be positioned at the bringing-up section that described thermal conductivity concentration detection sensor perimembranous described arrange in the shape of a spiral use heat conductivility be less than described in add heat pipe the material of remaining bringing-up section make.
A kind of optimal technical scheme as described thermal conductivity concentration detecting mechanism, the described heat pipe that adds includes adding heat pipe liquid input section and adding heat pipe going out liquid section, the described heat pipe liquid input section that adds goes out liquid section be connected by adding heat pipe " U " type linkage section with the described heat pipe that adds, described in add heat pipe " U " type linkage section and be horizontally placed on below described thermal conductivity concentration detection sensor.
A kind of optimal technical scheme as described thermal conductivity concentration detecting mechanism, described adding, is provided with conducting strip on heat pipe " U " type linkage section, be provided with sensor housing outside described thermal conductivity concentration detection sensor, described sensor housing by described conducting strip with described add heat pipe fix be connected.
As a kind of optimal technical scheme of described thermal conductivity concentration detecting mechanism, described device for homogenous heating is to be arranged on the heat shield outside described thermal conductivity concentration detection sensor.
A kind of optimal technical scheme as described thermal conductivity concentration detecting mechanism, described heat shield includes the first thermal insulation layer away from described thermal conductivity concentration detection sensor, and the second thermal insulation layer between described first thermal insulation layer and described thermal conductivity concentration detection sensor, realize being connected by some connecting tubes between described first thermal insulation layer with described second thermal insulation layer, outside described connecting tube connection heat shield inside and heat shield.
Preferably, described heat shield includes the first thermal insulation layer away from described thermal conductivity concentration detection sensor, and the second thermal insulation layer between described first thermal insulation layer and described thermal conductivity concentration detection sensor, described first thermal insulation layer uses the material of high thermal expansion coefficient to make.
On the other hand, it is provided that a kind of liquid level sensor of urea box, including fixing seat and liquid level detection device, also including urea concentration testing agency, described urea concentration testing agency uses thermal conductivity concentration detecting mechanism as above.
The beneficial effects of the utility model are: arrange device for homogenous heating in thermal conductivity concentration detection sensor perimembranous, make in heating process the carbamide around thermal conductivity concentration detection sensor heat up uniformly, reduce the impact that thermal conductivity concentration detection sensor detectable concentration is caused by temperature shock；Make the liquid level sensor of urea box needing to use under low-temperature heat environment that thermal conductivity concentration detection sensor can be used to carry out urea concentration measurement, certainty of measurement is high, test effect is notheated the impact of impact, urea concentration sensor perimembranous helical form is used to arrange the heating arrangement adding heat pipe so that urea concentration sensor perimembranous homogeneous temperature.
Accompanying drawing explanation
Below according to drawings and Examples, this utility model is described in further detail.
Fig. 1 is the liquid level sensor of urea box structural representation described in this utility model embodiment one.
Fig. 2 is the concentration detecting mechanism structural representation described in this utility model embodiment one.
Fig. 3 is that the bringing-up section corresponding with thermal conductivity concentration detection sensor described in this utility model embodiment one uses the sectional view adding heat pipe arranged in the shape of a spiral around described thermal conductivity concentration detection sensor.
Fig. 4 is the heat shield sectional view described in this utility model embodiment two.
Fig. 5 is the heat shield sectional view described in this utility model embodiment three.
In Fig. 1-3:
100, fixing seat；
200, liquid level detection device；201, electron tube；202, float；
300, concentration detecting mechanism；310, heat pipe is added；311, heat pipe liquid input section is added；312, add heat pipe and go out liquid section；313, heat pipe " U " type linkage section is added；320, thermal sleeve；330, thermal conductivity concentration detection sensor；340, conducting strip；
400, pipette；
In Fig. 4:
500, thermal conductivity concentration detection sensor；501, the second thermal insulation layer；502, the first thermal insulation layer；503, connecting tube；504, heat pipe is added；
In Fig. 5:
600, thermal conductivity concentration detection sensor；601, the second thermal insulation layer；602, the first thermal insulation layer；603, adapter cavity；604, heat pipe is added.
Detailed description of the invention
Further illustrate the technical solution of the utility model below in conjunction with the accompanying drawings and by detailed description of the invention.
For making this utility model solve the technical problem that, the technical scheme that uses and the technique effect reached clearer, below in conjunction with accompanying drawing, the technical scheme of this utility model embodiment is described in further detail, obviously, described embodiment is only a part of embodiment of this utility model rather than whole embodiments.Based on the embodiment in this utility model, the every other embodiment that those skilled in the art are obtained under not making creative work premise, broadly fall into the scope of this utility model protection.
Embodiment one:
As shown in Figures 1 to 3, in the present embodiment, described liquid level sensor of urea box includes fixing seat 100, liquid level detection device 200, thermal conductivity concentration detecting mechanism 300 and for drawing the pipette 400 of carbamide from urea box, described fixing seat 100 is for being connected fixing to liquid level sensor and urea box, and described liquid level detection device 200 includes fixing the electron tube 201 being connected with described fixing seat 100 and being set in the float 202 on described electron tube 201.
Described thermal conductivity concentration detecting mechanism 300 includes the heater for heating liquid to be detected, and for detecting the thermal conductivity concentration detection sensor 330 of the quality of described liquid to be detected, the perimembranous of described thermal conductivity concentration detection sensor 330 is provided with device for homogenous heating, and described device for homogenous heating can quickly realize urea concentration output while dissolving icing carbamide.
In the present embodiment, heater is for adding heat pipe 310, add heat pipe 310 to use and there is good heat conductive performance and corrosion resistant metal material is made, heat exchange type heating is carried out by adding heat pipe 310, by adding injection coolant inside heat pipe 310, make the heat that coolant is carried by adding the carbamide that heat pipe 310 tube wall passes in urea box.In order to ensure that the urea temperature of thermal conductivity concentration detection sensor 330 surrounding changes uniformly, the bringing-up section employing adding heat pipe 310 corresponding with thermal conductivity concentration detection sensor 330 is arranged in the shape of a spiral around described thermal conductivity concentration detection sensor 330, the heat exchange area added between heat pipe 310 and carbamide being in thermal conductivity concentration detection sensor 330 perimembranous is uniform, realizes the balance of heat exchange amount as far as possible.
The distance that the transmission efficiency of heat is transmitted with it has much relations, adds the beeline between each position and the described thermal conductivity concentration detection sensor 330 of heat pipe 310 bringing-up section corresponding with described thermal conductivity concentration detection sensor 330 identical described in the present embodiment.I.e. make to heat pipe 310 identical to the distance of heat sensitive sensor near heat sensitive sensor side tube wall, it is ensured that heat transmission is uniformly.
The purpose arranging device for homogenous heating is to reduce the impact that thermal conductivity concentration detection sensor 330 environment temperature rapid increase causes, the pipe thickness adding heat pipe 310 increasing relevant position can be used to make this part add heat pipe 310 and itself to become device for homogenous heating, heat pipe 310 surface can also be added in this part and increase heat-barrier material as device for homogenous heating, device for homogenous heating described in the present embodiment be arranged on described in add the heat-barrier material of heat pipe 310 bringing-up section corresponding with described thermal conductivity concentration detection sensor 330.Described heat-barrier material uses heat transference efficiency less than the resinous material manufacturing material adding heat pipe 310.
The form that arranges of heat-barrier material can be multiple, is covered in the heat-barrier material adding heat pipe 310 surface as heat ray filter as it is shown on figure 3, use in the present embodiment, but the set-up mode of heat-barrier material be arranged on described in add the thermal sleeve 320 on heat pipe 310 surface.The form using thermal sleeve 320 arranges heat-barrier material, comprehensively the position adding heat pipe 310 corresponding with thermal conductivity concentration detection sensor 330 can be thermally shielded, thus the impact that highly efficient retarding heat impact is on thermal conductivity concentration sensor, it is ensured that thermal conductivity concentration sensor 330 output valve is more accurate.
The concrete structure adding heat pipe 310 has also been described in detail by embodiment of the present utility model, such as Fig. 1, shown in 2, the described heat pipe 310 that adds includes adding heat pipe liquid input section 311 and adding heat pipe going out liquid section 312, the described inlet adding heat pipe liquid input section 311 and be arranged on fixing seat 100 is connected, add heat pipe to go out liquid section 312 and be connected with the liquid return hole being arranged on fixing seat 100, the described heat pipe liquid input section 311 that adds goes out liquid section 312 be vertically arranged in urea box in the mounted state with the described heat pipe that adds, the described heat pipe liquid input section 311 that adds goes out liquid section 312 be connected by adding heat pipe " U " type linkage section 313 with the described heat pipe that adds, form complete coolant channels, described heat pipe " U " the type linkage section 313 that adds is horizontally placed on below described thermal conductivity concentration detection sensor 330.
It is positioned at the part that the bringing-up section that described thermal conductivity concentration detection sensor 330 perimembranous arranges in the shape of a spiral can be heating pipe liquid input section 311, a part for liquid section 312 can also be gone out for adding heat pipe, and owing to needing to arrange device for homogenous heating at this section, therefore it is inevitably less than other parts to the heats of the carbamide in urea box, along with the movement travel lengthening in adding heat pipe 310, temperature reduces coolant, heats declines the most therewith, therefore to utilize the heat of coolant that carbamide is heated to greatest extent, improve heating efficiency, the present embodiment will be located in the bringing-up section that described thermal conductivity concentration detection sensor 330 perimembranous arranges in the shape of a spiral be arranged on and add heat pipe and go out in liquid section 312.
Described adding, is provided with conducting strip 340 on heat pipe " U " type linkage section 313.The installation site of described conducting strip 340 is positioned at the lower section of thermal conductivity concentration detection sensor 330.Described thermal conductivity concentration detection sensor 330 is outside is provided with sensor housing, and described sensor housing is fixed by described conducting strip 340 be connected with the described heat pipe 310 that adds.By arranging conducting strip 340, on the one hand heat exchange area can be increased, improve heat exchange efficiency, fix connection by conducting strip 340 simultaneously simultaneously and add heat pipe 310 and thermal conductivity concentration detection sensor 330, thus it is fixing with add heat pipe between 310 relative to position to realize thermal conductivity concentration detection sensor 330, both are avoided to occur relative motion to cause heat exchange uneven, and affect Concentration Testing effect, another further aspect itself can be fixed adding heat pipe 310 by arranging conducting strip 340, it is to avoid himself deforms.
In other embodiments of the present utility model, described thermal conductivity concentration detecting mechanism 300 can also use alternate manner to arrange heat ray filter.
Such as, in other embodiments of the present utility model, described heat-barrier material be arranged on described in add heat pipe 310 surface, and add the heat pipe 310 side near described thermal conductivity concentration detection sensor 330 described in being positioned at.Heat-barrier material is set by the way, heat in heating pipe 310 can be made to transmit to the direction away from thermal conductivity concentration detection sensor 330, avoiding the impact of the minimum level heats to carbamide while urea temperature conversion is too fast around thermal conductivity concentration detection sensor 330.
The most such as, heat conductivility can be used to be less than add the material of remaining bringing-up section of heat pipe 310 and make and be positioned at the bringing-up section of thermal conductivity concentration detection sensor 330 perimembranous, heat speed from this part bringing-up section diffuses to around carbamide itself is declined, i.e. this section adds heat pipe 310 self and forms described heat ray filter.The bringing-up section using this structure can be welded to connect with remaining bringing-up section by transition wlding, it is possible to realizes connecting by flange seal part.In view of adding the size of heat pipe 310 and the convenience of installation, the present embodiment uses the mode using transition to be welded to connect bringing-up section and the other parts bringing-up section being positioned at thermal conductivity concentration detection sensor 330 perimembranous.
In work process, liquid level sensor of urea box described in this utility model embodiment is arranged in urea box, add heat pipe liquid input section 311 for the coolant edge of heating urea to flow into, and by adding heat pipe 310 tube wall and the carbamide heat exchange in urea box, realize the heat treated to carbamide, when coolant flow to add heat pipe " U " type linkage section 313, heat is transferred to conducting strip 340 by tube wall, and is Urea by conducting strip 340.Coolant adds heat pipe by the entrance of heat pipe " U " type linkage section and goes out liquid section 312, owing to the bringing-up section surface configuration adding the corresponding thermal conductivity concentration detection sensor 330 of heat pipe 310 on this section has thermal sleeve 320, therefore the speed that at this, heat spreads in carbamide is slow, thus ensures the slow even variation of the urea temperature around thermal conductivity concentration detection sensor 330.
Embodiment two:
Fig. 4 is the heat shield sectional view described in the present embodiment, in the present embodiment, the structure of liquid level sensor of urea box is substantially the same as in the previous example, a kind of concentration detecting mechanism based on thermal conductivity concentration detection sensor 500 of offer is provided, including the heater for heating urea, and for detecting the thermal conductivity concentration detection sensor 500 of the quality of described carbamide, the perimembranous of described thermal conductivity concentration detection sensor 500 is provided with the device for homogenous heating that the heat distributed for slowing down described heater diffuses to the speed of described thermal conductivity concentration detection sensor 500.
Its main distinction is as shown in Figure 4, device for homogenous heating described in the present embodiment is to be arranged on the heat shield outside described thermal conductivity concentration detection sensor 500, by heat shield by directly by adding carbamide that heat pipe 504 heats and internal and between heat shield and described thermal conductivity concentration detection sensor 500 the carbamide of described heat shield is separated, reduce thermal conduction path between the two, thus avoid the range of temperature of the carbamide around thermal conductivity concentration detection sensor 500 so that it is even variation.
nullConcrete，Heat shield described in the present embodiment includes the first thermal insulation layer 502 and the second thermal insulation layer 501，Described first thermal insulation layer 502 is away from described thermal conductivity concentration detection sensor 500，Described second thermal insulation layer 501 is arranged between described first thermal insulation layer 502 and described thermal conductivity concentration detection sensor 500，Heat-insulation chamber is formed between described first thermal insulation layer 502 and described second people's layer，In order to reduce the heat-conducting effect of heat-insulation chamber，Heat-insulation chamber described in the present embodiment is vacuum chamber，Realize being connected by some connecting tubes 503 between described first thermal insulation layer 502 with described second thermal insulation layer 501，Described connecting tube 503 connects outside heat shield inside and heat shield，Described carbamide can be flowed between the inside and outside of described heat shield by described connecting tube 503，Heat between the most internal carbamide and outside carbamide is transmitted by the carbamide in connecting tube 503，In order to ensure heat transmission uniformly，Described connecting tube 503 is multiple，It is evenly arranged on the surface of described heat shield.
Owing to temperature of liquid pace of change is the fastest, just becoming apparent from of the uniformity reaction of its change, therefore the present embodiment reduces the size of heat transmission channels, the speed of variations in temperature can be reduced, ensure that the uniformity of variations in temperature simultaneously.
Embodiment three:
nullFig. 5 is the heat shield sectional view described in this utility model embodiment three，In the present embodiment, the structure of liquid level sensor of urea box is substantially the same as in the previous example，Described device for homogenous heating is similarly the heat shield being arranged on outside described thermal conductivity concentration detection sensor 600，And heat shield described in the present embodiment includes the first thermal insulation layer 602 and the second thermal insulation layer 601 equally，Its difference essentially consists in，First thermal insulation layer 602 described in the present embodiment is not fixing with between described second thermal insulation layer 601 to be connected，Adapter cavity 603 is formed between the first thermal insulation layer 602 and the second thermal insulation layer 601，It is provided with the first through hole on first thermal insulation layer 602，It is provided with the second through hole on second thermal insulation layer 601，First through hole and the second through hole are used for the flowing of carbamide，When the carbamide outside heat shield is by after adding the heating of heat pipe 604，Heat diffuses to carry out thermal diffusion for the first time in adapter cavity 603，Entered into by the second through hole again after adapter cavity 603 becoming uniformly and inside heat shield, internal carbamide is heated，Thus ensure，The variations in temperature of the carbamide around thermal conductivity concentration detection sensor 600 is affected uniformly and mild，Ensure that concentration determination precision is unaffected.
In order to strengthen the technique effect of technical scheme described in the present embodiment further, the present embodiment can also use and use the material with higher thermal coefficient of expansion to make described first thermal insulation layer 602, can expand after it is by outside Urea, thus increase the volume of adapter cavity 603, make heat expanding in described adapter cavity 603 more abundant.
Described first thermal insulation layer 602 can use a kind of material in copper, aluminum, manganese, magnesium, silver, lead, cadmium to make.It is made of copper in the first thermal insulation layer 602 described in the present embodiment.
In the present embodiment, term " first ", " second " are only used for being distinguish between on describing, the most special implication.
It is to be understood that; above-mentioned detailed description of the invention is only preferred embodiment of the present utility model and institute's application technology principle; in technical scope disclosed in the utility model; change that any those familiar with the art is readily apparent that or replacement, all should contain in protection domain of the present utility model.
Claims (10)
1. a thermal conductivity concentration detecting mechanism, it is characterized in that, including the heater for heating liquid to be detected, and for detecting the thermal conductivity concentration detection sensor of the quality of described liquid to be detected, the perimembranous of described thermal conductivity concentration detection sensor is provided with device for homogenous heating.
Thermal conductivity concentration detecting mechanism the most according to claim 1, it is characterized in that, described heater for adding heat pipe, described in add the heat pipe bringing-up section corresponding with described thermal conductivity concentration detection sensor and arrange in the shape of a spiral around described thermal conductivity concentration detection sensor.
Thermal conductivity concentration detecting mechanism the most according to claim 2, it is characterised in that described device for homogenous heating is the heat-barrier material being arranged on the described heater bringing-up section corresponding with described thermal conductivity concentration detection sensor.
Thermal conductivity concentration detecting mechanism the most according to claim 3, it is characterized in that, described in add the beeline between each position and the described thermal conductivity concentration detection sensor of the heat pipe bringing-up section corresponding with described thermal conductivity concentration detection sensor identical.
Thermal conductivity concentration detecting mechanism the most according to claim 3, it is characterised in that described heat-barrier material be arranged on described in add tube surface, and add the heat pipe side near described thermal conductivity concentration detection sensor described in being positioned at；
Or, described heat-barrier material be arranged on described in add the thermal sleeve of tube surface；
Thermal conductivity concentration detecting mechanism the most according to claim 3, it is characterized in that, the described heat pipe that adds includes adding heat pipe liquid input section and adding heat pipe going out liquid section, the described heat pipe liquid input section that adds goes out liquid section be connected by adding heat pipe " U " type linkage section with the described heat pipe that adds, described in add heat pipe " U " type linkage section and be horizontally placed on below described thermal conductivity concentration detection sensor.
Thermal conductivity concentration detecting mechanism the most according to claim 6, it is characterized in that, described adding, is provided with conducting strip on heat pipe " U " type linkage section, be provided with sensor housing outside described thermal conductivity concentration detection sensor, described sensor housing by described conducting strip with described add heat pipe fix be connected；And/or, be positioned at the bringing-up section that described thermal conductivity concentration detection sensor perimembranous described arrange in the shape of a spiral use heat conductivility be less than described in add heat pipe the material of remaining bringing-up section make.
Thermal conductivity concentration detecting mechanism the most according to claim 1, it is characterised in that described device for homogenous heating is to be arranged on the heat shield outside described thermal conductivity concentration detection sensor.
Thermal conductivity concentration detecting mechanism the most according to claim 8, it is characterized in that, described heat shield includes the first thermal insulation layer away from described thermal conductivity concentration detection sensor, and the second thermal insulation layer between described first thermal insulation layer and described thermal conductivity concentration detection sensor, realize being connected by some connecting tubes between described first thermal insulation layer with described second thermal insulation layer, outside described connecting tube connection heat shield inside and heat shield.
10. a liquid level sensor of urea box, including fixing seat and liquid level detection device, it is characterised in that also include urea concentration testing agency, and described urea concentration testing agency uses the thermal conductivity concentration detecting mechanism according to any one of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620189981.3U CN205426827U (en) | 2016-03-11 | 2016-03-11 | Heat -conduction formula concentration detection mechanism and urea case level sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620189981.3U CN205426827U (en) | 2016-03-11 | 2016-03-11 | Heat -conduction formula concentration detection mechanism and urea case level sensor |
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| CN205426827U true CN205426827U (en) | 2016-08-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105606642A (en) * | 2016-03-11 | 2016-05-25 | 东莞正扬电子机械有限公司 | Heat-conduction-type concentration detecting mechanism and urea-box liquid level sensor |
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2016
- 2016-03-11 CN CN201620189981.3U patent/CN205426827U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105606642A (en) * | 2016-03-11 | 2016-05-25 | 东莞正扬电子机械有限公司 | Heat-conduction-type concentration detecting mechanism and urea-box liquid level sensor |
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Granted publication date: 20160803 Effective date of abandoning: 20181016 |