CN209356116U - A kind of urea pressure sensor - Google Patents
A kind of urea pressure sensor Download PDFInfo
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- CN209356116U CN209356116U CN201920153984.5U CN201920153984U CN209356116U CN 209356116 U CN209356116 U CN 209356116U CN 201920153984 U CN201920153984 U CN 201920153984U CN 209356116 U CN209356116 U CN 209356116U
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- pipe sleeve
- cavity
- urea
- pressure sensor
- mounting groove
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Abstract
The utility model discloses a kind of urea pressure sensors, including, the first pipe sleeve, the second pipe sleeve, shell；It is packed into shell after first pipe sleeve, the assembly of the second pipe sleeve are integral, is hollow inner tube inside first pipe sleeve, rubber sleeve is installed in inner tube, be the second hollow cavity inside the rubber sleeve；It is disposed with third cavity, the 4th cavity, detection mounting groove to the other end from being connected to one end with the second cavity inside second pipe sleeve, the 4th cavity will test mounting groove and be connected to third cavity；Pressure chip, the pressure input of pressure chip and the 4th cavity face are installed, pressure chip and detection mounting groove inner wall sealing are assembled in the detection mounting groove.The utility model structure is simple, and damages after urea liquid can be effectively prevent to freeze to urea pressure sensor, to improve the stability of urea pressure sensor, reduce vehicle failure rate.
Description
Technical field
The utility model relates to automotive sensor technologies, more particularly to a kind of urea pressure sensor.
Background technique
Since the requirement of environmental protection is higher and higher, the sharp increase of automobile quantity, the pollution of vehicle exhaust, which has become, causes ring
One big factor of border pollution, and urea for vehicle amount of solution plays a crucial role motor vehicle exhaust emission, urea pressure passes
Sensor is the sensor of the SCR urea injection system for After-treatment technics, urea pressure detecting is carried out, so that it is determined that urea
The amount of injection.
When environment temperature is lower than -11 DEG C, urea liquid is easily freezed, and freezes rear volume expansion about 10%, when urea is molten
After liquid frost, urea liquid can generate immense pressure in sensor internal, to destroy the structure and sensing element of sensor.
The known pressure sensor of existing urea on the market rushes oil tech using diffusion silicon, molten by convoluted diaphragm isolating urea
Liquid, urea liquid pressure act on convoluted diaphragm first, then by silicone oil between diaphragm and Silicon pressure chip by pressure
It is transmitted to pressure chip, since the convoluted diaphragm of welding is very soft, is easily deformed after encountering hard objects, therefore, is being used
In the process, it because compression shock is larger and the urea frost bulbs of pressure are excessive, is possible to cause product failure.
Utility model content
In view of the above drawbacks of the prior art, the technical problem to be solved by the utility model is to provide a kind of urea pressures
Force snesor damages urea pressure sensor after capable of preventing urea liquid from freezing.
To achieve the above object, the utility model provides a kind of urea pressure sensor, including, the first pipe sleeve, second
Pipe sleeve, shell；It is packed into shell after first pipe sleeve, the assembly of the second pipe sleeve are integral, is hollow interior inside first pipe sleeve
Pipe, it is the second hollow cavity inside the rubber sleeve that inner tube is interior, which to install rubber sleeve,；By with second inside second pipe sleeve
Cavity is connected to one end and is disposed with third cavity, the 4th cavity, detection mounting groove to the other end, and the 4th cavity will test
Mounting groove is connected to third cavity；Pressure chip, the pressure input of pressure chip and are installed in the detection mounting groove
Four cavity faces, pressure chip and detection mounting groove inner wall sealing are assembled.
Preferably, the first pipe sleeve outer cover is equipped with sealing ring, and is sealed by the conduit of sealing ring and urea liquid
Assembly.
Preferably, first pipe sleeve is packed on shell one end and is provided with the first pipe sleeve bulge loop, the first pipe sleeve bulge loop
It is packed into the second pipe sleeve bulge loop and sealing assembly therewith, the second pipe sleeve bulge loop is arranged on the second casing；
First pipe sleeve, the second pipe sleeve are packed into shell after being fixed by the first pipe sleeve bulge loop, the assembly of the second pipe sleeve bulge loop, and
It assembles and fixes with shell；
Preferably, rubber sleeve is made of elastic material.
Preferably, first pipe sleeve is set with the first cavity for being provided on one end and being connected to the second cavity with sealing ring,
First cavity runs through the first pipe sleeve.
Preferably, it is circular hole that second cavity, the 4th cavity, which are section,；The third cavity is bellmouth,
Its diameter most big end and inner tube diameter is identical, smallest end diameter is identical as the 4th cavity internal diameter.
Preferably, the gap between pressure chip and detection mounting groove inner wall passes through adhesive glue, sealant, resin wherein one
Kind is bonded and sealed.
Preferably, second pipe sleeve be provided with detection mounting groove one end be packed into it is electrical intracavitary, it is electrical intracavitary to be also equipped with
Wiring board, signal amplification circuit is provided on wiring board, and the input terminal and pressure chip signal end communication of signal amplification circuit connect
It connects, the signal amplification circuit is used to amplify the pressure signal of pressure chip, and the output end of signal amplification circuit and inserted sheet are logical
News connection；
Garment bag, garment bag inner hollow are provided on the wiring board, the second pipe sleeve is provided with detection mounting groove one end
It is packed into garment bag, and passes through protective glue glue envelope, sealing between pressure chip and garment bag inside.
Preferably, the first inserting groove, the second inserting groove are also respectively provided in the shell, the inserted sheet extends respectively to
In first inserting groove, the second inserting groove.
Preferably, the first sealed cylinder, the second sealed cylinder are additionally provided on the shell, the second sealed cylinder is located at the
In one sealed cylinder, and is constituted between the first sealed cylinder, the second sealed cylinder and pour sealing groove, it is described to pour sealing groove and third sealing drum
Body assembly；
Third sealed cylinder is arranged on the cover board, and cover board closes electrical chamber；Described pour also passes through epoxy resin in sealing groove
Encapsulation.
The beneficial effects of the utility model are: the utility model structure is simple, and urea liquid can be effectively prevent to freeze
Urea pressure sensor is damaged afterwards, to improve the stability of urea pressure sensor, reduce vehicle failure rate.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model.
Fig. 2 is part (at the first pipe sleeve, the second pipe sleeve) structural schematic diagram of the utility model.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples:
Referring to Fig. 1-Fig. 2, a kind of urea pressure sensor, including, the first pipe sleeve 2, the second pipe sleeve 4, shell 12, described
One pipe sleeve, 2 outer cover be equipped with sealing ring 1, in use, the first pipe sleeve 2 be packed into urea liquid conduit in, and by sealing ring 1 with
The conduit of urea liquid seals assembly, so that urea liquid be introduced in the first pipe sleeve 2；
First pipe sleeve 2 is packed on 12 one end of shell and is provided with the first pipe sleeve bulge loop 23, the first pipe sleeve bulge loop 23
It is packed into the second pipe sleeve bulge loop 24 and sealing assembly therewith, the second pipe sleeve bulge loop 24 is arranged on the second casing 3；
First pipe sleeve 2, the second pipe sleeve 4 are packed into shell after fixing by the first pipe sleeve bulge loop 23, the assembly of the second pipe sleeve bulge loop 24
In body 12, and assembles and fix with shell 12；
It is hollow inner tube 25 inside first pipe sleeve 2, rubber sleeve 3 is installed in inner tube 25, inside the rubber sleeve 3
For the second hollow cavity 15, and rubber sleeve 3 is made of elastic material in the present embodiment, such as EPDM；
First pipe sleeve 2 is set on one end with sealing ring 1 and is provided with the first cavity 14 being connected to the second cavity 15, the
One cavity 14 runs through the first pipe sleeve 2, so that urea liquid is inducted into the second cavity 15；
Inside second pipe sleeve 4 from be connected to the second cavity 15 one end to the other end be disposed with third cavity 16,
4th cavity 17, detection mounting groove 26, the 4th cavity 17 will test mounting groove 26 and be connected to third cavity 16；
And it is circular hole that second cavity 15, the 4th cavity 17, which are section,；The third cavity 16 is bellmouth
16, diameter most big end and 25 internal diameter of inner tube is identical, smallest end diameter is identical as 17 internal diameter of the 4th cavity.Preferably, described
The radius of two cavitys 15 is the 1/4-1/2 of 25 internal diameter of inner tube, this provides enough resignings after capable of freezing for urea liquid is cooling
Space, the volume that the urea liquid icicle of crystallographic expansion is expanded is by squeezing rubber sleeve 3, so that rubber sleeve 3 occurs
Flexible deformation is offset, this can prevent urea liquid icicle from damaging first pipe sleeve 2.
Preferably, 17 radius of the 4th cavity is the 1/6-1/4 of 15 internal diameter of the second cavity, and this design is so that the 4th chamber
Urea liquid in body 17 is seldom, and also can first crystallize at a lower temperature.Since urea liquid is seldom, even if crystallizing into
The volume of ice, expansion is few, also little to the impact of the 4th cavity 17, pressure chip 5, so as to prevent the 4th cavity
17, pressure chip 5 is damaged.
Pressure chip 5 is installed, the pressure input of pressure chip 5 and the 4th cavity 17 are just in the detection mounting groove 26
It is right, and the gap between pressure chip 5 and detection 26 inner wall of mounting groove is one of viscous by adhesive glue, sealant, resin etc.
Knot sealing；Pressure chip 5 is hydraulic in the 4th cavity 17 for detecting；
Second pipe sleeve 4 is provided with detection 26 one end of mounting groove and is packed into electrical chamber 27, is also equipped in electrical chamber 27
Wiring board 9, the wiring board 9 are used to receive the pressure signal of pressure chip 5, and signal amplification is specially provided on wiring board 9
Circuit, the input terminal and 5 signal end communication connection of pressure chip of signal amplification circuit, the signal amplification circuit is for amplifying pressure
The pressure signal of power chip 5, and the output end of signal amplification circuit and 13 communication connection of inserted sheet.Pressure chip in the present embodiment
5, wiring board 9 is the prior art and can directly purchase, and can use the pressure chip and wiring board of existing urea sensor
Or its function similar portions.
Garment bag 6,6 inner hollow of garment bag are provided on the wiring board 9, the second pipe sleeve 4 is provided with detection mounting groove
26 one end are packed into garment bag 6, and pass through 8 glue of protective glue envelope, sealing, protective glue 8 between 6 inside of pressure chip 5 and garment bag
It is one such to can be sealant, resin, glass cement etc..This word always accompanies you to cross design and mainly seals pressure chip 5, prevents
Only urea liquid passes through pressure chip 5 and enters in electrical chamber 27；
The first sealed cylinder 18, the second sealed cylinder 19 are additionally provided on the shell 12, the second sealed cylinder 19 is located at
In first sealed cylinder 18, and is constituted between the first sealed cylinder 18, the second sealed cylinder 19 and pour sealing groove 20, it is described to pour sealing groove 20
It is assembled with third sealed cylinder 28, specially third sealed cylinder 28 is sleeved on 19 outer wall of the second sealed cylinder；
Third sealed cylinder 28 is arranged on cover board 10, and cover board 10 closes electrical chamber 27；Described pour in sealing groove 20 is also led to
11 encapsulation of epoxy resin is crossed, so that being sealed between third sealed cylinder 28 and the second sealed cylinder 19, this design master
If considering for waterproof.
The first inserting groove 21, the second inserting groove 22 are also respectively provided in the shell 12, the inserted sheet 13 each extends over
To the first inserting groove 21, the second inserting groove 22, in use, external equipment can be inserted into the first inserting groove 21 or the by plug
In two inserting grooves 22, then by signal wire and 13 communication connection of inserted sheet, so that the amplified pressure signal of wiring board be exported
To external equipment, such as vehicle-mounted CPU, vehicle-mounted computer.
Preferably, the first pipe sleeve, the second pipe sleeve are all made of stainless steel production, and when assembly, rubber sleeve 1 is placed in the first
In one pipe sleeve 2, then the first pipe sleeve 2 and the second pipe sleeve 4 are welded, after the completion of to be welded, are placed in note together with inserted sheet
Injection molding is carried out in mould.
After injection molding, wiring board and case weld are fixed, viscose glue glue is further put on the second pipe sleeve 4, by pressure
Chip is placed on the second pipe sleeve 4, hot setting.After cured by pressure chip with spun gold bonding in the circuit board, next is put
Garment bag is set, point protection glue, then hot setting, several to shell surrounding point epoxy resin glue after cured, then will lid
Plate, which covers to be put into baking oven, to be solidified.
The rubber sleeve of the present embodiment is made of EPDM, the volume expansion after can effectively absorbing urea liquid frost, from
And protect pressure-sensing device.
The first cavity, the second cavity, third cavity, the 4th cavity are provided in the utility model, when urea liquid is full of
When the first cavity, the second cavity, third cavity, four cavitys, in the case where environment temperature is lower than -11 DEG C, since the 4th chamber is intracorporal
Amount of solution it is least, so the 4th intracorporal urea liquid of chamber can be freezed first, impact suffered by pressure chip at this time is only
The expansive force of urea liquid in four cavitys；After the intracorporal solution frost of the 4th chamber, the intracorporal solution of third chamber can be freezed, due to
4th cavity has been in frost solid state, so the expansive force of urea liquid can only act on third chamber in third cavity
On the conical inboard wall of body；
The intracorporal urea liquid frost of second chamber again, using the intracorporal rubber sleeve of the second chamber is placed on, passes through rubber
The design of sleeve wall thickness, so that the expansive force that urea liquid freezes in the second cavity can be fully absorbed by rubber sleeve.
4th inside cavity spatial hole very little further reduces the residual quantity of urea liquid.By to the first cavity,
Two cavitys, third cavity, the 4th cavity space volume size control (sectional area and height that control each cavity) i.e.
The frost sequence of residual urea solution can be accurately controlled, and the third cavity of taper can effectively change the effect side of expansive force
To.
Place is not described in detail for the utility model, is the well-known technique of those skilled in the art.
The preferred embodiments of the present invention have been described in detail above.It should be appreciated that the ordinary skill people of this field
Member according to the present utility model can conceive without creative work makes many modifications and variations.Therefore, all this technology necks
Technical staff passes through logic analysis, reasoning or limited reality according to the design of the utility model on the basis of existing technology in domain
Available technical solution is tested, it all should be within the scope of protection determined by the claims.
Claims (10)
1. a kind of urea pressure sensor, including, the first pipe sleeve, the second pipe sleeve, shell；First pipe sleeve, the second pipe sleeve are assembled into
It is packed into shell after one, it is characterized in that:
It is hollow inner tube inside first pipe sleeve, rubber sleeve is installed in inner tube, is hollow the inside the rubber sleeve
Two cavitys；Third cavity, the 4th chamber are disposed with to the other end from being connected to one end with the second cavity inside second pipe sleeve
Body, detection mounting groove, the 4th cavity will test mounting groove and be connected to third cavity；Pressure is installed in the detection mounting groove
Power chip, the pressure input of pressure chip and the 4th cavity face, pressure chip and detection mounting groove inner wall sealing are assembled.
2. urea pressure sensor as described in claim 1, it is characterized in that: the first pipe sleeve outer cover is equipped with sealing ring,
And it is sealed and is assembled by the conduit of sealing ring and urea liquid.
3. urea pressure sensor as described in claim 1 is arranged it is characterized in that: first pipe sleeve is packed on shell one end
There is the first pipe sleeve bulge loop, the first pipe sleeve bulge loop is packed into the second pipe sleeve bulge loop and sealing assembly therewith, second pipe sleeve
Bulge loop is arranged on the second casing；
First pipe sleeve, the second pipe sleeve are packed into shell after being fixed by the first pipe sleeve bulge loop, the assembly of the second pipe sleeve bulge loop, and and shell
Body assembly is fixed.
4. urea pressure sensor as described in claim 1, it is characterized in that: rubber sleeve is made of elastic material.
5. urea pressure sensor as described in claim 1, it is characterized in that: first pipe sleeve and sealing ring are set on one end
It is provided with the first cavity being connected to the second cavity, the first cavity runs through the first pipe sleeve.
6. urea pressure sensor as described in claim 1, it is characterized in that: second cavity, the 4th cavity are section
For circular hole；The third cavity is bellmouth, third cavity diameter most big end is identical with inner tube diameter, smallest end diameter and
4th cavity internal diameter is identical.
7. urea pressure sensor as described in claim 1, it is characterized in that: between pressure chip and detection mounting groove inner wall
Gap is bonded and sealed by adhesive glue, sealant, resin one of which.
8. urea pressure sensor as described in claim 1, it is characterized in that: second pipe sleeve is provided with detection mounting groove one
End loading is electrical intracavitary, electrically intracavitary to be also equipped with wiring board, and signal amplification circuit, signal amplification circuit are provided on wiring board
Input terminal and pressure chip signal end communication connection, the signal amplification circuit be used to amplify the pressure signal of pressure chip,
And the output end of signal amplification circuit and inserted sheet communication connection；
Garment bag, garment bag inner hollow are provided on the wiring board, the second pipe sleeve is provided with detection mounting groove one end and is packed into
In garment bag, and pass through protective glue glue envelope, sealing between pressure chip and garment bag inside.
9. urea pressure sensor as claimed in claim 8, it is characterized in that: being also respectively provided with the first grafting in the shell
Slot, the second inserting groove, the inserted sheet extend respectively to the first inserting groove, in the second inserting groove.
10. urea pressure sensor as described in claim 1, it is characterized in that: being additionally provided with the first sealing drum on the shell
Body, the second sealed cylinder, the second sealed cylinder are located in the first sealed cylinder, and the first sealed cylinder, the second sealed cylinder it
Between constitute and pour sealing groove, it is described to pour sealing groove and third sealed cylinder assembles；
Third sealed cylinder is arranged on the cover board, and cover board closes electrical chamber；It is described to pour in sealing groove also by epoxy resin encapsulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920153984.5U CN209356116U (en) | 2019-01-29 | 2019-01-29 | A kind of urea pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920153984.5U CN209356116U (en) | 2019-01-29 | 2019-01-29 | A kind of urea pressure sensor |
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| Publication Number | Publication Date |
|---|---|
| CN209356116U true CN209356116U (en) | 2019-09-06 |
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ID=67803483
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920153984.5U Active CN209356116U (en) | 2019-01-29 | 2019-01-29 | A kind of urea pressure sensor |
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| Country | Link |
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| CN (1) | CN209356116U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110672258A (en) * | 2019-10-09 | 2020-01-10 | 武汉飞恩微电子有限公司 | Hydraulic shock resistance and freezing resistance urea solution pressure sensor |
| CN111006810A (en) * | 2019-11-22 | 2020-04-14 | 武汉飞恩微电子有限公司 | Pressure sensor with medium isolation measurement module |
| CN112304474A (en) * | 2019-12-04 | 2021-02-02 | 武汉飞恩微电子有限公司 | Pressure sensor |
| CN115112287A (en) * | 2022-07-07 | 2022-09-27 | 东风柳州汽车有限公司 | Water pressure sensing device with freezing protection function for automobile |
-
2019
- 2019-01-29 CN CN201920153984.5U patent/CN209356116U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110672258A (en) * | 2019-10-09 | 2020-01-10 | 武汉飞恩微电子有限公司 | Hydraulic shock resistance and freezing resistance urea solution pressure sensor |
| CN113218566A (en) * | 2019-10-09 | 2021-08-06 | 武汉飞恩微电子有限公司 | Urea solution pressure sensor |
| CN111006810A (en) * | 2019-11-22 | 2020-04-14 | 武汉飞恩微电子有限公司 | Pressure sensor with medium isolation measurement module |
| CN112304474A (en) * | 2019-12-04 | 2021-02-02 | 武汉飞恩微电子有限公司 | Pressure sensor |
| CN115112287A (en) * | 2022-07-07 | 2022-09-27 | 东风柳州汽车有限公司 | Water pressure sensing device with freezing protection function for automobile |
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