CN207764080U - Measuring device and urea box for measuring urea concentration in SCR system - Google Patents
Measuring device and urea box for measuring urea concentration in SCR system Download PDFInfo
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- CN207764080U CN207764080U CN201721885438.8U CN201721885438U CN207764080U CN 207764080 U CN207764080 U CN 207764080U CN 201721885438 U CN201721885438 U CN 201721885438U CN 207764080 U CN207764080 U CN 207764080U
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Abstract
The utility model belongs to detection device technology field, and in particular to a kind of measuring device and urea box for measuring urea concentration in SCR system.Measuring device described in the utility model for measuring urea concentration in SCR system, including silicon micro mechanical resonance pressure sensor and liquid level sensor, the silicon micro mechanical resonance pressure sensor is set to the base pressure P of the bottom of urea box and the internal solution for detecting the urea box, the liquid level sensor is used to detect the liquid level h of the internal solution of the urea box, the density of the internal solution of the urea box is calculated by pressure formula P=ρ gh, to obtain the urea concentration in the internal solution.By using the measuring device and urea box described in the utility model for measuring urea concentration in SCR system, effectively the urea concentration in SCR system can be detected, improve the compliance rate of urea concentration, and simple in structure, be easy to use and repair.
Description
Technical field
The utility model belongs to detection device technology field, and in particular to one kind is for measuring urea concentration in SCR system
Measuring device and urea box.
Background technology
SCR system is to ensure that urea keeps sufficient to vehicle in use, is mounted with that liquid level passes at the top of urea box
Sensor can incude liquid level in real time.In addition to the liquid level of urea, the quality of urea is to the NO in exhaustxBe catalyzed reduction effect and
Secondary pollution all plays an important role.As (NH in the urea liquid used2)2When the content deficiency of CO, that is, the urea water that uses
Solution concentration is insufficient, hydrolyzes the NH of generation3It is less, it can not be by whole NOXIt is catalysed and reduced into free of contamination N2And H2O；Work as use
Urea liquid (NH2)2When CO contents are exceeded, the NH of generation is hydrolyzed3Excessively, it be easy to cause secondary pollution.
Vehicle after-treatment system is that the adding amount of urea liquid in detection urea box is mounted with to float at the top of urea box at present
Minor swept resistance sensor, can discontinuous display urea level in urea filling process, you can measures the depth of solution in real time
Degree.And after the completion of urea fills, solution is in a kind of stationary state, is passed by the silicon micro mechanical resonant pressure of urea box bottom
Sensor can measure out the pressure that the solution of the adding amount generates.By pressure and solution density and the relationship of depth, i.e. P=ρ gh,
The density of solution can be calculated, and then extrapolates solution concentration.On the contrary, when determining one timing of urea concentration, it also can school inspection liquid level
Whether sensor detection result is accurate.
Utility model content
Purpose of the utility model is to solve above-mentioned at least one problem, which is by following technology
What scheme was realized.
It is micro- including silicon the utility model proposes a kind of measuring device for measuring urea concentration in SCR system
Mechanical resonant pressure sensor and liquid level sensor, the bottom that the silicon micro mechanical resonance pressure sensor is set to urea box are used in combination
In the base pressure P for the internal solution for detecting the urea box, the liquid level sensor is used to detect the inside of the urea box
The liquid level h of solution the density of the internal solution of the urea box is calculated by pressure formula P=ρ gh, to obtain
Urea concentration in the internal solution, wherein g are acceleration of gravity.
Further, the silicon micro mechanical resonance pressure sensor includes pressure sensitive diaphragm resonator, the resonator
On the pressure sensitive diaphragm and it is sealed in the urea box.
Further, the silicon micro mechanical resonance pressure sensor is set to the centre position of the bottom of the urea box, institute
State the centre position that resonator is set to the upper surface of the pressure sensitive diaphragm.
Further, the liquid level sensor is float-type swept resistance sensor.
The utility model proposes a kind of urea boxes, wherein being equipped with described above for measuring urea in SCR system
The measuring device of concentration.
By using described in the utility model for measuring the measuring device and urea box of urea concentration in SCR system,
Effectively the urea concentration in SCR system can be detected, precision is high, improves the compliance rate of urea concentration, and structure letter
It is single, it is easy for installation, it is easy to use and repairs.
Description of the drawings
By reading the detailed description of hereafter preferred embodiment, various other advantages and benefit are common for this field
Technical staff will become clear.Attached drawing only for the purpose of illustrating preferred embodiments, and is not considered as to this practicality
Novel limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings：
Fig. 1 is the structural schematic diagram of the utility model embodiment；
Fig. 2 is the structural schematic diagram of pressure sensor in the utility model.
Respectively label indicates as follows in attached drawing：
10：Silicon micro mechanical resonance pressure sensor, 11：Press sensitive diaphragm, 12：Resonator；
20：Liquid level sensor；
30：Urea box.
Specific implementation mode
The illustrative embodiments of the disclosure are more fully described below with reference to accompanying drawings.Although showing this public affairs in attached drawing
The illustrative embodiments opened, it being understood, however, that may be realized in various forms the disclosure without the reality that should be illustrated here
The mode of applying is limited.It is to be able to be best understood from the disclosure on the contrary, providing these embodiments, and can be by this public affairs
The range opened completely is communicated to those skilled in the art.
Fig. 1 is the structural schematic diagram of the utility model embodiment.Fig. 2 is that the structure of pressure sensor in the utility model is shown
It is intended to.As shown in Figure 1, the measuring device for measuring urea concentration in SCR system in the present embodiment, including silicon microcomputer
Tool resonance pressure sensor 10 and liquid level sensor 20.Silicon micro mechanical resonance pressure sensor 10 is set to the bottom of urea box 30 simultaneously
Base pressure P for the internal solution for detecting urea box 30, liquid level sensor 20 are used to detect the internal solution of urea box 30
Liquid level h, the density of the internal solution of urea box 30 can be calculated by pressure formula P=ρ gh, to obtain solution
In urea concentration, wherein g be acceleration of gravity.
Further, as shown in Fig. 2, the silicon micro mechanical resonance pressure sensor 10 in the present embodiment includes pressure sensitive diaphragm
11 resonators 12, resonator 12 are set on pressure sensitive diaphragm 10 and are sealed in urea box 30.
The silicon micro mechanical resonance pressure sensor 10 being made of 11 resonator 12 of pressure sensitive diaphragm be current precision highest,
Best one of the pressure sensor of long-time stability.Its resonator 12 is fixed on the surface appropriate location of pressure sensitive diaphragm 11, and
It is sealed in reference pressure environment.When testing pressure changes, pressure sensitive diaphragm 11 will deform and the rigidity of resonator 12 caused to become
Change, the intrinsic frequency variation by detecting resonator 12 can realize pressure measurement.It can be counted by pressure formula P=ρ gh again
The density for calculating the internal solution for obtaining urea box 30, to show that the urea concentration in solution, wherein P are the inside of urea box 30
The base pressure of solution, h are the liquid level of the internal solution of urea box 30, and g is acceleration of gravity, and ρ is the close of urea liquid
Degree.
Further, silicon micro mechanical resonance pressure sensor 10 is set to the centre position of the bottom of urea box 30, resonator
12 are set to the centre position of the upper surface of pressure sensitive diaphragm 11.Wherein, liquid level sensor 20 is float-type swept resistance sensor.
The utility model also proposed a kind of urea box 30, be urinated including described above for measuring in SCR system
The measuring device of plain concentration.
By using described in the utility model for measuring the measuring device and urea box of urea concentration in SCR system,
Effectively the urea concentration in SCR system can be detected, improve the compliance rate of urea concentration, and simple in structure, installed
It is convenient, it is easy to use and repairs.
The preferable specific implementation mode of the above, only the utility model, but the scope of protection of the utility model is not
It is confined to this, any one skilled in the art within the technical scope disclosed by the utility model, can readily occur in
Change or replacement, should be covered within the scope of the utility model.Therefore, the scope of protection of the utility model should be with
Subject to the scope of the claims.
Claims (5)
1. a kind of measuring device for measuring urea concentration in SCR system, which is characterized in that including silicon micro mechanical resonant pressure
Sensor and liquid level sensor, the silicon micro mechanical resonance pressure sensor are set to the bottom of urea box and for detecting the urine
The base pressure P of the internal solution of plain case, the liquid level that the liquid level sensor is used to detect the internal solution of the urea box are high
H is spent, the density of the internal solution of the urea box is calculated by pressure formula P=ρ gh, to obtain the internal solution
In urea concentration, wherein g be acceleration of gravity.
2. the measuring device according to claim 1 for measuring urea concentration in SCR system, which is characterized in that described
Silicon micro mechanical resonance pressure sensor includes pressure sensitive diaphragm resonator, and the resonator is set on the pressure sensitive diaphragm simultaneously
It is sealed in the urea box.
3. the measuring device according to claim 2 for measuring urea concentration in SCR system, which is characterized in that described
Silicon micro mechanical resonance pressure sensor is set to the centre position of the bottom of the urea box, and the resonator is set to the pressure-sensitive sense
The centre position of the upper surface of diaphragm.
4. the measuring device according to claim 1 for measuring urea concentration in SCR system, which is characterized in that described
Liquid level sensor is float-type swept resistance sensor.
5. a kind of urea box, which is characterized in that be equipped with and be used to measure SCR systems according to any one of claim 1-4
The measuring device of urea concentration in system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721885438.8U CN207764080U (en) | 2017-12-28 | 2017-12-28 | Measuring device and urea box for measuring urea concentration in SCR system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721885438.8U CN207764080U (en) | 2017-12-28 | 2017-12-28 | Measuring device and urea box for measuring urea concentration in SCR system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207764080U true CN207764080U (en) | 2018-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721885438.8U Active CN207764080U (en) | 2017-12-28 | 2017-12-28 | Measuring device and urea box for measuring urea concentration in SCR system |
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| CN (1) | CN207764080U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110180605A (en) * | 2019-04-25 | 2019-08-30 | 苏州滨特尔水处理有限公司 | Brine strength detection method and device |
-
2017
- 2017-12-28 CN CN201721885438.8U patent/CN207764080U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110180605A (en) * | 2019-04-25 | 2019-08-30 | 苏州滨特尔水处理有限公司 | Brine strength detection method and device |
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