CN207066661U - A kind of SCR system pressure sensor - Google Patents
A kind of SCR system pressure sensor Download PDFInfo
- Publication number
- CN207066661U CN207066661U CN201720802328.4U CN201720802328U CN207066661U CN 207066661 U CN207066661 U CN 207066661U CN 201720802328 U CN201720802328 U CN 201720802328U CN 207066661 U CN207066661 U CN 207066661U
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- CN
- China
- Prior art keywords
- pressure
- flexible member
- guide hole
- scr system
- housing
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Exhaust Gas After Treatment (AREA)
Abstract
The utility model discloses a kind of SCR system pressure sensor, including housing, be laid in housing bottom and with liquid feed channel that enclosure interior connects, spacing limit element can be carried out in the pressure core that housing moves up and down, the flexible member elapsed downwards above pressure core and to pressure core and to flexible member, limit element, flexible member and pressure core are from top to bottom laid in enclosure interior；Pressure core includes pedestal and is arranged on the compression film of base bottom, and the setting of compression film bottom is fluted, and the bottom inside of housing is provided with the boss for stretching into groove.The utility model is simple in construction, input cost is low and it is convenient to realize, enters the volume of enclosure interior using pressure guide hole limitation urea liquid, while change freezing sequentially for urea liquid；Ensure that pressure core is not damaged by when urea liquid freezes by the release bulbs of pressure of flexible member release urea liquid, add the working life of the pressure sensor.
Description
Technical field
The utility model belongs to automobile environment-protection technical field, more particularly, to a kind of SCR system pressure sensor.
Background technology
SCR technology (SCR) is a handling process for NOx in exhaust gas from diesel vehicle discharge, that is, is being urged
In the presence of agent, reducing agent ammonia or urea are sprayed into, the NOx in tail gas is reduced into N2And H2O。
At present, more than 90% heavy-duty commercial vehicle carries diesel engine, and SCR technology (SCR) is to realize
Exhaust emissions of diesel engine reaches national IV and the mainstream technology route of above regulation.With the rapid development of modern automobile industry,
Pollution of the exhaust emissions of automobile to environment is increasing, it has also become the important pollution sources of haze.Vehicle maintenance service SCR system
Can be N by vehicle maintenance service2And vapor, solution can freeze when urea liquid in SCR system is below -11 DEG C, freeze
Volume can expand about 10% afterwards, cause internal system to produce huge pressure (up to hundreds of MPa) and be far longer than normal work
Pressure, it is ensured that the pressure sensor of measurement urea liquid pressure is not damaged by turning into one stubborn problem of the sector.
Urea liquid in SCR system can freeze to freeze at low temperature, and now urea liquid can occur about 10%
The expansion of volume, and 100 times of the maximum reachable service pressure of the bulbs of pressure.Common pressure sensor typically only 2~3
Overload pressure ability again, i.e. maximum possible bear 2~3 times of service pressure.Therefore, common pressure sensor is used for
During SCR system, it can occur to damage caused by urea liquid freezes to freeze.
Utility model content
Technical problem to be solved in the utility model is to be directed to above-mentioned deficiency of the prior art, there is provided a kind of SCR
System pressure sensor, its is simple in construction, reasonable in design, input cost is low and realizes that convenient, using effect is good, using pilot
Hole limitation urea liquid enters the volume of enclosure interior, while changes freezing sequentially for urea liquid；Pass through flexible member part
The bulbs of pressure for discharging urea liquid ensure that pressure core is not damaged by when urea liquid freezes, and add the pressure sensing
The working life of device.
In order to solve the above technical problems, the technical solution adopted in the utility model is：A kind of SCR system pressure sensing
Device, it is characterised in that：Including housing, the liquid feed channel for being laid in housing bottom and being connected with enclosure interior, can be in housing
The pressure core that moves up and down and detected to enclosure interior fluid pressure, above the pressure core and to institute
State the flexible member and spacing limit element is carried out to flexible member that pressure core elapsed downwards, the limit element,
Flexible member and the pressure core are from top to bottom laid in enclosure interior, and the limit element is fixed on housing；
The pressure core includes pedestal and is arranged on the compression film of base bottom, and the compression film bottom is provided with
Groove, the bottom inside of the housing are provided with the boss for stretching into the groove；The inlet and quilt of the liquid feed channel
The sprue connection of SCR system is tested, the liquid outlet of the liquid feed channel is located at below the groove.
A kind of above-mentioned SCR system pressure sensor, it is characterized in that：The flexible member is being located at the pressure core just
Top, the liquid outlet of the liquid feed channel are located at the underface of the groove.
A kind of above-mentioned SCR system pressure sensor, it is characterized in that：The liquid feed channel is pressure guide hole.
A kind of above-mentioned SCR system pressure sensor, it is characterized in that：The pressure guide hole includes being opened in boss middle and upper part
First pressure guide hole and the second pressure guide hole connected with the first pressure guide hole, the liquid outlet of the first pressure guide hole go out liquid for the pressure guide hole
Mouthful, the sectional dimension of first pressure guide hole is not more than the sectional dimension of second pressure guide hole.
A kind of above-mentioned SCR system pressure sensor, it is characterized in that：Set between the flexible member and the limit element
Pad is equipped with, the flexible member upper end is connected with the pad.
A kind of above-mentioned SCR system pressure sensor, it is characterized in that：The pressure core also includes being arranged on the compression
The back-up ring on diaphragm top, the flexible member are installed between the pad and back-up ring.
A kind of above-mentioned SCR system pressure sensor, it is characterized in that：By sealing member between the boss and the groove
Part is attached.
A kind of above-mentioned SCR system pressure sensor, it is characterized in that：Between the top surface of the boss and the groove floor
Distance be not more than 3mm.
The utility model has advantages below compared with prior art：
1st, SCR system pressure sensor structure of the present utility model is simple, reasonable in design and easy-to-connect, input cost
It is low.
2nd, SCR system pressure sensor of the present utility model, including housing, it is laid in housing bottom and and enclosure interior
The liquid feed channel of connection, the pressure core that can be moved up and down in housing and be detected to enclosure interior fluid pressure
Body, the flexible member elapsed downwards above pressure core and to pressure core and the limit spacing to flexible member progress
Bit unit, limit element, flexible member and pressure core are from top to bottom laid in enclosure interior, and limit element is fixed on housing
On, it is simple in construction, it is easy to use.
3rd, the utility model is by setting boss, and with the fit depressions of the lower end of compression film, effectively reduce
Base into contact reduces the turgor pressure discharged during the expansion of enclosure interior urea liquid to pedestal to the contact area of urea liquid
Power.
4th, the utility model, when urea liquid freezes, changes freezing for urea liquid by setting liquid feed channel
Sequentially, that is, the liquid outlet of pressure guide hole is first freezed, freezed after the liquid inlet of pressure guide hole, so that in SCR system sprue
Bulbs of pressure when urea liquid freezes will not be delivered on pedestal again, so as to protect pedestal not to be destroyed.
5th, the utility model puts the bulbs of pressure to ensure that pressure core exists by flexible member come discharge that urea liquid releases
It is not damaged by when urea liquid freezes, adds the working life of the pressure sensor.
In summary, the utility model is simple in construction, reasonable in design, input cost is low and realizes that convenient, using effect is good,
The volume of enclosure interior is entered using pressure guide hole limitation urea liquid, while changes freezing sequentially for urea liquid；Pass through elasticity
The release bulbs of pressure of element release urea liquid ensure that pressure core is not damaged by when urea liquid freezes, and add this
The working life of pressure sensor.
Below by drawings and examples, the technical solution of the utility model is described in further detail.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the design method FB(flow block) of the utility model elastic element pretightning force.
Description of reference numerals:
1-housing, 2-potted component；3-compression film；
4-back-up ring；5-flexible member, 6-limit element
The pressure guide holes of 7-pad 8-1-first；The pressure guide holes of 8-2-second；
9-boss；10-pedestal.
Embodiment
A kind of SCR system pressure sensor as shown in Figure 1, including housing 1, be laid in the bottom of housing 1 and with housing 1
The liquid feed channel of inside connection, the pressure that can be moved up and down in housing 1 and be detected to the internal liquid pressure of housing 1
Power core body, the flexible member 5 elapsed downwards above the pressure core and to the pressure core and to elastic member
Part 5 carries out spacing limit element 6, and the limit element 6, flexible member 5 and the pressure core are from top to bottom laid in shell
Inside body 1, the limit element 6 is fixed on housing 1；
The pressure core includes pedestal 10 and is arranged on the compression film 3 of the bottom of pedestal 10, the bottom of compression film 3
Set fluted, the bottom inside of the housing 1 is provided with the boss 9 for stretching into the groove；The liquid feed channel enters
Liquid mouth connects with the sprue of tested SCR system, and the liquid outlet of the liquid feed channel is located at below the groove.
During actual use, the boss 9 and the fit depressions of the bottom of compression film 3 are set, and are effectively reduced
The compression film 3 touches the contact area of urea liquid in the SCR system, and the urea reduced inside the housing 1 is molten
To the bulbs of pressure of the compression film 3 release when liquid expands.
During actual use, the liquid in the liquid feed channel is the urea liquid in the SCR system.
In the present embodiment, the operating pressure P of the compression film 3 is not more than 20bar, and the most serious offense of the compression film 3
Load pressure is P1, and P1=2P~3P.
In the present embodiment, the bulbs of pressure P of urea liquid in the SCR system3For 50bar~1000bar, when the SCR systems
When urea liquid freezes in system, the bulbs of pressure P of urea liquid in the SCR system3Discharged by the flexible member 5,
The release bulbs of pressure of release are P4, the remaining bulbs of pressure in the SCR system after urea liquid release are P5, it is described by press mold
The maximum overload pressure P of piece 31Not less than the remaining bulbs of pressure P5。
During actual use, when urea liquid does not freeze, upwards thrust caused by the compression film 3 is less than or equal to
The pretightning force of the flexible member 5, the pretightning force of the flexible member 5 is P2, now the position of the compression film 3 is constant.
During actual use, when urea liquid freezes in the SCR system, urea liquid volumetric expansion, the bulbs of pressure are discharged
P4More than the pretightning force P of flexible member 52, the compression film 3 moves up, and is made by back-up ring 4, pad 7 and limit element 6
The flexible member 5 is compressed, so as to discharge bulbs of pressure P by described4Discharged, the remaining expansion after urea liquid release
Pressure is P5, and the remaining bulbs of pressure P5No more than the maximum overload pressure P of the compression film 31, so as to protect pressure
Core body is not destroyed, and adds the working life of the pressure sensor.
During actual use, when urea liquid thaws, pretightning force P of the compression film 3 in the flexible member 52Make
Initial position is returned under.
As shown in Fig. 2 during actual use, the design method of the pretightning force of flexible member 5, comprise the following steps：
Step 1: the determination of parameter：The operating pressure P of the pedestal 10 is determined according to the design of the SCR system sprue
And in the SCR system urea liquid bulbs of pressure P3；
Step 2: the determination of pedestal maximum overload pressure：Urea liquid is swollen in the SCR system determined according to step 1
Swelling pressure power P3Determine the maximum overload pressure P of the compression film 31, P1≥P2；
Step 3: the determination of flexible member pretightning force：The operating pressure P of the compression film 3 determined according to step 1
The pretightning force for determining the flexible member 5 is P2, P2≥P。
During actual use, the effect of the pressure guide hole is that urea liquid is introduced into the pressure from the SCR system sprue
Core body.
During actual use, the flexible member 5 is circumferentially disposed along the madial wall of housing 1 and in the bullet vertically laid
Spring is the ripple shell fragment for being arranged on the bottom of limit element 6, preferably ripple shell fragment, due to the volume of ripple shell fragment
Small and coefficient of elasticity is big.
In the present embodiment, the flexible member 5 is located at the surface of the pressure core, and the liquid feed channel goes out
Liquid mouth is located at the underface of the groove, it is therefore an objective to ensures the uniform force of compression film 3.
In the present embodiment, the liquid feed channel is pressure guide hole.
In the present embodiment, the pressure guide hole include be opened in the middle and upper part of boss 9 the first pressure guide hole 8-1 and with the first pilot
Second pressure guide hole 8-2, the first pressure guide hole 8-1 of hole 8-1 connections liquid outlet is the liquid outlet of the pressure guide hole, and described first leads
Hole 8-1 sectional dimension is pressed to be not more than the sectional dimension of the second pressure guide hole 8-2.
In the present embodiment, the pressure guide hole include the first pressure guide hole 8-1 connected with the inside of the housing 1 and with the SCR
Second pressure guide hole 8-2, the first pressure guide hole 8-1 of system sprue connection sectional dimension is not more than second pressure guide hole
8-2 sectional dimension, the first pressure guide hole 8-1 are opened in the middle and upper part of the boss 9, the first pressure guide hole 8-1 and
Two pressure guide hole 8-2 are connected；
First pressure guide hole 8-1 a diameter of 0.3mm~5mm in the pressure guide hole, compared with existing pressure guide hole, this implementation
The diameter of the pressure guide hole in example is smaller, and when urea liquid freezes, the liquid outlet for being advantageous to limit the pressure guide hole is carried out
Freeze, while the second pressure guide hole 8-2 sectional dimension be designed as the sectional dimension not less than the first pressure guide hole 8-1, it is therefore an objective to
After the urea liquid in the first pressure guide hole 8-1 freezes, the urea liquid not freezed in the second pressure guide hole 8-2 can be faster
The SCR system sprue is back to, the urea liquid being effectively prevented in the second pressure guide hole 8-2 freezes rear volumetric expansion to
Frozen urea liquid produces the bulbs of pressure in one pressure guide hole 8-1, causes the first pressure guide hole 8-1 to destroy, and then make the base
Seat 10 produces damage.
During actual use, the longitudinal section of the second pressure guide hole 8-2 can be trapezoid cross section or square-section.
During actual use, the second pressure guide hole 8-2 and the first pressure guide hole 8-1 can be not provided with the same horizontal line.
In the present embodiment, pad 7, the flexible member 5 are provided between the flexible member 5 and the limit element 6
Upper end is connected with the pad 7.
During actual use, pad 7 is provided between the flexible member 5 and the limit element 6, it is therefore an objective to make described
When compressed, the top of the flexible member 5 produces flexible displacement to flexible member 5, and protection is played to flexible member 5 and is made
With, prevent the flexible member 5 top produce hard breakdown.
In the present embodiment, the pressure core also includes the back-up ring 4 for being arranged on the top of compression film 3, the elasticity
Element 5 is installed between the pad 7 and back-up ring 4.
During actual use, the top of the back-up ring 4 is bonded laying with the bottom of the flexible member 5, in urea liquid not
Before freezing, active force is not present between the back-up ring 4 and the flexible member 5, when urea liquid freezes, the back-up ring 4
The thrust upward to the flexible member 5 is produced, the flexible member 5 is compressed, when freezing so as to offset urea liquid
The bulbs of pressure of release, it is effectively protected the pressure core.
In the present embodiment, it is attached between the boss 9 and the groove by potted component.
During actual use, potted component is O-shaped rubber seal, because O-shaped rubber seal is flexible, practicality is high
And sealing is strong, the effect of the O-shaped rubber seal is set to be the urea liquid sealing being introduced into the housing 1.
In the present embodiment, the distance between the top surface of the boss 9 and the groove floor are not more than 3mm.
During actual use, gap is left between the top surface of the boss 9 and the groove floor, it is therefore an objective to make urea liquid
It can smoothly enter and be contacted in housing 1 with the compression film 3.
It is described above, only it is preferred embodiment of the present utility model, not the utility model is imposed any restrictions, every
Any simple modification, change and the equivalent structure change made according to the utility model technical spirit to above example, still
Belong in the protection domain of technical solutions of the utility model.
Claims (8)
- A kind of 1. SCR system pressure sensor, it is characterised in that：Including housing (1), it is laid in housing (1) bottom and and shell The liquid feed channel of the internal connection of body (1), it can be moved up and down in housing (1) and housing (1) internal liquid pressure is entered The pressure core of row detection, the flexible member elapsed downwards above the pressure core and to the pressure core (5) spacing limit element (6), the limit element (6), flexible member (5) and the pressure and to flexible member (5) are carried out Core body is from top to bottom laid in housing (1) inside, and the limit element (6) is fixed on housing (1)；The pressure core includes pedestal (10) and is arranged on the compression film (3) of pedestal (10) bottom, the compression film (3) Bottom setting is fluted, and the bottom inside of the housing (1) is provided with the boss (9) for stretching into the groove；The liquid flows into The inlet of passage connects with the sprue of tested SCR system, and the liquid outlet of the liquid feed channel is located at the groove Lower section.
- 2. according to a kind of SCR system pressure sensor described in claim 1, it is characterised in that：Flexible member (5) position In the surface of the pressure core, the liquid outlet of the liquid feed channel is located at the underface of the groove.
- 3. according to a kind of SCR system pressure sensor described in claim 1 or 2, it is characterised in that：The liquid flows into logical Road is pressure guide hole.
- 4. according to a kind of SCR system pressure sensor described in claim 3, it is characterised in that：The pressure guide hole includes opening The second pressure guide hole (8-2) for being located at first pressure guide hole (8-1) of boss (9) middle and upper part and being connected with the first pressure guide hole (8-1), the The liquid outlet of one pressure guide hole (8-1) is the liquid outlet of the pressure guide hole, and the sectional dimension of first pressure guide hole (8-1) is not more than The sectional dimension of second pressure guide hole (8-2).
- 5. according to a kind of SCR system pressure sensor described in claim 1 or 2, it is characterised in that：The flexible member (5) pad (7) is provided between the limit element (6), flexible member (5) upper end is connected with the pad (7).
- 6. according to a kind of SCR system pressure sensor described in claim 5, it is characterised in that：The pressure core is also wrapped The back-up ring (4) for being arranged on the compression film (3) top is included, the flexible member (5) is installed in the pad (7) and back-up ring (4) between.
- 7. according to a kind of SCR system pressure sensor described in claim 1 or 2, it is characterised in that：The boss (9) with It is attached between the groove by potted component.
- 8. according to a kind of SCR system pressure sensor described in claim 1 or 2, it is characterised in that：The boss (9) The distance between top surface and the groove floor are not more than 3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720802328.4U CN207066661U (en) | 2017-07-04 | 2017-07-04 | A kind of SCR system pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720802328.4U CN207066661U (en) | 2017-07-04 | 2017-07-04 | A kind of SCR system pressure sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207066661U true CN207066661U (en) | 2018-03-02 |
Family
ID=61508112
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720802328.4U Ceased CN207066661U (en) | 2017-07-04 | 2017-07-04 | A kind of SCR system pressure sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207066661U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109387322A (en) * | 2017-08-08 | 2019-02-26 | 罗伯特·博世有限公司 | Pressure sensor and method for manufacturing pressure sensor |
| CN109596260A (en) * | 2019-01-03 | 2019-04-09 | 西安中星测控有限公司 | A kind of pressure transmitter |
-
2017
- 2017-07-04 CN CN201720802328.4U patent/CN207066661U/en not_active Ceased
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109387322A (en) * | 2017-08-08 | 2019-02-26 | 罗伯特·博世有限公司 | Pressure sensor and method for manufacturing pressure sensor |
| CN109596260A (en) * | 2019-01-03 | 2019-04-09 | 西安中星测控有限公司 | A kind of pressure transmitter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| IW01 | Full invalidation of patent right |
Decision date of declaring invalidation: 20200403 Decision number of declaring invalidation: 43886 Granted publication date: 20180302 |
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| IW01 | Full invalidation of patent right |