CN207750127U - A kind of urea liquid feed system - Google Patents
A kind of urea liquid feed system Download PDFInfo
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- CN207750127U CN207750127U CN201721191915.0U CN201721191915U CN207750127U CN 207750127 U CN207750127 U CN 207750127U CN 201721191915 U CN201721191915 U CN 201721191915U CN 207750127 U CN207750127 U CN 207750127U
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- diaphragm pump
- urea
- feed system
- liquid feed
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Abstract
The utility model discloses a kind of urea liquid feed systems, it includes the urea box by piping connection, first diaphragm pump, second diaphragm pump, accumulator and nozzle module, first diaphragm pump is connected by inlet pipe with urea box, and its outlet end is divided into two-way, the liquid feeding end of the second diaphragm pump is wherein connected by connecting line all the way, another way is connected by return line with urea box, second diaphragm pump connects the liquid feeding end of accumulator by the first outlet tube road, the outlet end of the accumulator is divided into two-way, nozzle module is wherein connected all the way, another way is connected by third outlet tube road with the urea box, reversal valve is installed on the connecting line, level-one reflux module is installed on the return line, the third outlet tube road is equipped with two level reflux module.Above-mentioned urea liquid feed system can not only avoid urea crystals, blocking pipeline；And it is stable, noise is small, improves accuracy of spray.
Description
Technical field
The utility model belongs to diesel motor exhaust post-processing technology, more particularly, to a kind of no air-assisted urea
Solution feeding system.
Background technology
Internal purification technology can not fully meet increasingly harsh discharge standard, therefore install tail gas additional to diesel engine
After-treatment device becomes necessity.The post-processing technology of mainstream is SCR technology at present, that is, urea liquid is used to be purified as reducing agent
Nitrogen oxides in tail gas.Urea liquid feed system includes mainly：Store the urea box of urea liquid, by the urine in urea box
Urea pump that plain solution is pumped into exhaust pipe, the urea liquid level sensor for detecting the liquid level in urea box, and prevent
The cooling water system of urea crystals.
On existing market using it is more be air-assisted urea liquid feed system, wherein add compressed gas source,
Blast injection clean pipeline in urea raffinate, such system structure is more complex, in pipeline still can residual urea crystallization, block up
Plug problem is serious, and load compressed gas source is also needed in system, and above-mentioned factor all limits its further genralrlization application.In addition,
Generally not reliable and stable suction inlet filter device, impurity enter supplying module to urea liquid feed system currently on the market
Inside causes feed system power plant to fail, and easily breaks down.
Utility model content
The purpose of this utility model is to provide a kind of urea liquid feed systems, to solve urea liquid in the prior art
Feed system has that urea easily crystallizes, blocks serious, anti-impurity energy force difference, required compressed gas source.
For this purpose, the utility model uses following technical scheme：
A kind of urea liquid feed system comprising pass through the urea box of piping connection, the first diaphragm pump, the second diaphragm
Pump, accumulator and nozzle module, wherein the liquid feeding end of first diaphragm pump is connected by inlet pipe with urea box, and
The outlet end of first diaphragm pump is divided into two-way, wherein connecting the liquid feeding end of the second diaphragm pump by connecting line all the way, separately
It is connected all the way with urea box by return line, the outlet end of second diaphragm pump connects accumulation of energy by the first outlet tube road
The outlet end of the liquid feeding end of device, the accumulator is divided into two-way, wherein connecting nozzle module by the second outlet tube road all the way, separately
It is connected all the way with the urea box by third outlet tube road, the first reversal valve is installed on the connecting line, described time
Flow tube road is equipped with level-one reflux module, and the third outlet tube road is equipped with two level reflux module, the inlet pipe
On the second reversal valve is installed, second reversal valve passes through the first outlet tube of piping connection road.
Particularly, back suction pump is also equipped between the inlet pipe and first outlet tube, the back suction pump uses
Motor drive or electromagnetic drive it is any.
Particularly, filter is installed in the inlet pipe, ensures that impurity will not enter in diaphragm pump, causes diaphragm pump
Failure keeps feed system cleaning inside.
Particularly, first diaphragm pump and the second diaphragm pump share a driving device, are fully effectively utilized motor
Output torque improves the efficiency of entire diaphragm pump, reduces energy consumption.
Particularly, it is mounted on flow on the pipeline of the liquid feeding end and outlet end of first diaphragm pump and the second diaphragm pump
Valve.
Particularly, the third outlet tube road is provided between the accumulator and two level reflux module for detecting
The pressure sensor of loine pressure.
Particularly, the nozzle module includes atomizer and the solenoid valve for controlling atomizer switch.
Particularly, the driving device using motor drive or electromagnetic drive it is any.
Particularly, the 2/2-way solenoid valve and two-bit triplet solenoid valve share same solenoid actuated.
Particularly, have by piping connection between the outlet end and the outlet end of the filter of first diaphragm pump
Three reversal valves.
The beneficial effects of the utility model are that the urea liquid feed system is auxiliary using no air compared with prior art
Formula structure is helped, is pumped by using double-operation diaphragm, when realizing injection urea liquid, diaphragm pump startup aspirates urine from urea box
Plain solution, is pumped by pipeline at nozzle module, and urea liquid is measured by controlling the opening time of solenoid valve；Injection knot
Shu Hou is commutated by solenoid valve control circuit, and diaphragm pump to urea box, solves the urea liquid resorption for remaining in internal system
The problem of urea crystals, blocking pipeline；Increase filter in supplying module suction inlet, can greatly reduce because impurity is in pump
The problem of portion's aggregation causes pump to fail, and two-stage reflux type is used, it solves because caused by suction inlet increases filter chamber
In solution the problem of increased air bubble；It uses double-operation diaphragm pump and is used as power source, more balanced than single-acting diaphragm pump, is steady
It is fixed, noise smaller；Two-stage reflux is used, asking for the system accuracy of spray shakiness caused by bubble accumulation etc. can be reduced
Topic improves accuracy of spray.
Description of the drawings
Fig. 1 is the structural schematic diagram for the urea liquid feed system that specific embodiment of the present invention 1 provides；
Fig. 2 is the structural schematic diagram for the urea liquid feed system that specific embodiment of the present invention 2 provides.
Specific implementation mode
Further illustrate the technical solution of the utility model below with reference to the accompanying drawings and specific embodiments.
Embodiment one：
Refering to Figure 1, Fig. 1 is the knot for the urea liquid feed system that specific embodiment of the present invention 1 provides
Structure schematic diagram.
In the present embodiment, a kind of urea liquid feed system include by the urea box 1 of piping connection, the first diaphragm pump 2,
Second diaphragm pump 3, accumulator 4 and nozzle module 5, the liquid feeding end of first diaphragm pump, 2 and second diaphragm pump 3 and outlet end
Flat valve 6 is mounted on pipeline so that diaphragm pump can only unidirectionally pump solution, prevent from flowing backwards.And 2 He of the first diaphragm pump
Second diaphragm pump 3 shares the driving of same motor 7, can fully be effectively utilized motor output torque, improve entire diaphragm pump
Efficiency, reduce energy consumption, reduce cost.There are 180 ° of phase differences, the second diaphragms for first diaphragm pump, 2 and second diaphragm pump 3
The suction inlet of pump 3 is connected with the first diaphragm pump 2, ensure that 3 suction inlet of the second diaphragm pump by certain pre- injection pressure power, improves second
The discharge stability of diaphragm pump 3.
The liquid feeding end of first diaphragm pump 2 is connected by inlet pipe 8 with urea box 1, and first diaphragm pump 2
Outlet end be divided into two-way, wherein connecting the liquid feeding end of the second diaphragm pump 3 by connecting line 9 all the way, another way passes through reflux
Pipeline 10 is connected with urea box 1, and the outlet end of second diaphragm pump 3 connects accumulator 4 by the first outlet tube road 11
The outlet end of liquid feeding end, the accumulator 4 is divided into two-way, wherein connecting nozzle module 5 by the second outlet tube road 12 all the way, separately
It is connected all the way with the urea box 1 by third outlet tube road 13.The nozzle module 5 is including atomizer 50 and for controlling
The solenoid valve 51 that atomizer 50 processed switchs, to ensure that liquid can be sucked totally in the pipeline, in resorption, solenoid valve 51
Unlatching need to be coordinated.
First reversal valve 14 is installed on the connecting line 9, first reversal valve 14 uses 2/2-way solenoid valve,
Second reversal valve 15 is installed in the inlet pipe 8, second reversal valve 15 uses two-bit triplet solenoid valve, and described second
Reversal valve 15 is realized by the first outlet tube of piping connection road 11, the setting of first reversal valve, 14 and second reversal valve 15
Forward direction builds pressure conveying and reversed take out shares a power plant, and first reversal valve 14 is synchronous with the second reversal valve 15
Work, therefore by the way of sharing electromagnet, you can cost can also be reduced by saving space.But arranged for ease of structure, the
One reversal valve 14 and the second reversal valve 15 may be set to be and respectively drive.
Level-one reflux module 16 is installed, being equipped with two level on third outlet tube road 13 returns on the return line 10
Most of gas can be directly discharged into inside urea box, solve and filtered by increasing by flow module 17, the level-one reflux module 16
Chamber causes negative effect, the two level reflux module 17 to be used for system loads, and voltage regulation result is good and at low cost.
Filter 18 is installed in the inlet pipe 8, ensures that impurity will not enter in diaphragm pump, diaphragm pump is caused to lose
Effect keeps feed system cleaning inside.
On third outlet tube road 13 pressure sensor is provided between the accumulator 4 and two level reflux module 17
19, pressure sensor 19 is used for signal piping pressure, and feeds back to control circuit, with real-time control motor speed.
When normal transport urea solution, motor 7 starts, the first reversal valve 14 and the second reversal valve 15 must not electricity, first every
Membrane pump 2 and the second diaphragm pump 3 work, urea liquid from urea box 1 successively pass through filter 18, the second reversal valve 15, first every
Membrane pump 2 is discharged；Non- withdrawing fluid is discharged through the first reversal valve 14 and the second diaphragm pump 3；The liquid of second diaphragm pump 3 discharge is through storing
Energy device 4 reaches nozzle module 5, and solenoid valve 51 controls atomizer 50 and opens, and implements metered injection.It should be noted that by the
The partially liq of one diaphragm pump 2 discharge is back to urea box 1 via level-one reflux module 16, the portion being discharged by the second diaphragm pump 3
Liquid separation body is back to via two level reflux module 17 in urea box 1.
There is third to change by piping connection between the outlet end and the outlet end of the filter 18 of first diaphragm pump 2
To valve 20, the third reversal valve 20 uses 2/2-way solenoid valve, and the outlet end of the first diaphragm pump 2 is connected to liquid feeding end.
When Liquid Residue in shut-down resorption pipeline, the first reversal valve 14, the second reversal valve 15 and third reversal valve 20 are simultaneously
It is electric, under the effect of the second reversal valve 15, the first diaphragm pump 2 is from 4 inlet imbibition of accumulator, the liquid of the first diaphragm pump 2 discharge
Body is back to urea box via level-one reflux module 16, and at the same time, the second diaphragm pump 3 will can partly remain on the liquid of its entrance
Body drains into outlet, is siphoned away by the first diaphragm pump 2.Atomizer 50 can be opened with certain frequency during resorption, to ensure the road
Liquid is sucked totally.After aspiration procedure, motor 7 powers off, the first reversal valve 14, the second reversal valve 15 and third reversal valve
20 simultaneously dead electricity, system reply original state.During resorption, the first diaphragm pump 2 is from the first outlet tube road 11, the second outlet tube
Urea is aspirated at road 12, third outlet tube road 13 and accumulator 4, and the urea in filter 18 is discharged, to ensure in system
Portion is almost without residual urea.The above process solves the problems, such as system residual urea liquid, easily crystallization, icing, causes
The problems such as pipeline blockage, damage system.
Embodiment two：
It please refers to shown in Fig. 2, Fig. 2 is the knot for the urea liquid feed system that specific embodiment of the present invention 2 provides
Structure schematic diagram.
The present embodiment and embodiment one main difference is that：The inlet pipe 8 and first outlet tube 11 it
Between pipeline on installation back suction pump 21, the second reversal valve 15 uses 2/2-way solenoid valve, while eliminating third reversal valve 20
Setting, back suction process is realized by back suction pump 21, the back suction pump 21 driven using motors or electromagnetic drive it is any.
Rest part is identical as the structure of embodiment one.
Above example is to elaborate the basic principle and characteristic of the utility model, and the utility model is not by above-mentioned example
Limitation, on the premise of not departing from the spirit and scope of the utility model, the utility model also has various changes, these changes
Change and change and both falls in claimed the scope of the utility model.The utility model requires protection scope is wanted by appended right
Ask book and its equivalent thereof.
Claims (10)
1. a kind of urea liquid feed system comprising by the urea box of piping connection, the first diaphragm pump, the second diaphragm pump,
Accumulator and nozzle module, which is characterized in that the liquid feeding end of first diaphragm pump is connected by inlet pipe with urea box,
And the outlet end of first diaphragm pump is divided into two-way, wherein the liquid feeding end of the second diaphragm pump is connected by connecting line all the way,
Another way is connected by return line with urea box, and the outlet end of second diaphragm pump is connected by the first outlet tube road to be stored
The liquid feeding end of energy device, the outlet end of the accumulator are divided into two-way, wherein nozzle module is connected by the second outlet tube road all the way,
Another way is connected by third outlet tube road with the urea box, and the first reversal valve is equipped on the connecting line, described
Level-one reflux module is installed, the third outlet tube road is equipped with two level reflux module, the inlet tube on return line
Road is equipped with the second reversal valve, and second reversal valve passes through the first outlet tube of piping connection road.
2. urea liquid feed system according to claim 1, which is characterized in that the inlet pipe goes out with described first
It is also equipped with back suction pump between liquid pipe, back suction pump is any using motor driving or electromagnetic drive.
3. urea liquid feed system according to claim 1 or 2, which is characterized in that be equipped in the inlet pipe
Filter.
4. urea liquid feed system according to claim 1, which is characterized in that first diaphragm pump and the second diaphragm
Pump shares a driving device.
5. urea liquid feed system according to claim 1, which is characterized in that first diaphragm pump and the second diaphragm
It is mounted on flat valve on the liquid feeding end of pump and the pipeline of outlet end.
6. urea liquid feed system according to claim 1, which is characterized in that the third outlet tube road is in described
The pressure sensor for signal piping pressure is provided between accumulator and two level reflux module.
7. urea liquid feed system according to claim 1, which is characterized in that the nozzle module includes atomizer
With the solenoid valve for controlling atomizer switch.
8. urea liquid feed system according to claim 4, which is characterized in that the driving device is driven using motor
Or electromagnetic drive is any.
9. urea liquid feed system according to claim 1, which is characterized in that first reversal valve and the second commutation
Valve shares same solenoid actuated.
10. urea liquid feed system according to claim 3, which is characterized in that the outlet end of first diaphragm pump
There is third reversal valve by piping connection between the outlet end of the filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721191915.0U CN207750127U (en) | 2017-09-15 | 2017-09-15 | A kind of urea liquid feed system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721191915.0U CN207750127U (en) | 2017-09-15 | 2017-09-15 | A kind of urea liquid feed system |
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| Publication Number | Publication Date |
|---|---|
| CN207750127U true CN207750127U (en) | 2018-08-21 |
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ID=63146598
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721191915.0U Active CN207750127U (en) | 2017-09-15 | 2017-09-15 | A kind of urea liquid feed system |
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| CN (1) | CN207750127U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107476860A (en) * | 2017-09-15 | 2017-12-15 | 华中科技大学无锡研究院 | A kind of urea liquid feed system |
| CN110821614A (en) * | 2019-11-22 | 2020-02-21 | 华中科技大学 | Air-assisted urea pump adopting two-stage diaphragm pump |
| CN110985170A (en) * | 2019-12-18 | 2020-04-10 | 华中科技大学 | Non-air-assisted urea pump adopting novel reversing valve and application thereof |
-
2017
- 2017-09-15 CN CN201721191915.0U patent/CN207750127U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107476860A (en) * | 2017-09-15 | 2017-12-15 | 华中科技大学无锡研究院 | A kind of urea liquid feed system |
| CN107476860B (en) * | 2017-09-15 | 2023-08-29 | 华中科技大学无锡研究院 | Urea solution supply system |
| CN110821614A (en) * | 2019-11-22 | 2020-02-21 | 华中科技大学 | Air-assisted urea pump adopting two-stage diaphragm pump |
| CN110985170A (en) * | 2019-12-18 | 2020-04-10 | 华中科技大学 | Non-air-assisted urea pump adopting novel reversing valve and application thereof |
| CN110985170B (en) * | 2019-12-18 | 2021-01-19 | 华中科技大学 | Non-gas-assisted urea pump and application thereof |
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