CN202113780U - Urea metering pump filtering and pressure-stabilizing device in SCR (selective catalytic reduction) system - Google Patents
Urea metering pump filtering and pressure-stabilizing device in SCR (selective catalytic reduction) system Download PDFInfo
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- CN202113780U CN202113780U CN2011200298756U CN201120029875U CN202113780U CN 202113780 U CN202113780 U CN 202113780U CN 2011200298756 U CN2011200298756 U CN 2011200298756U CN 201120029875 U CN201120029875 U CN 201120029875U CN 202113780 U CN202113780 U CN 202113780U
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Abstract
The utility model relates to a urea metering pump filtering and pressure-stabilizing device in an SCR (selective catalytic reduction) system, which comprises a casing, an end cap and a filter element. The filter element is arranged in the casing sealed by the end cap; a liquid inlet and a liquid outlet are arranged on the casing; a liquid storage cavity is formed between the filter element and the casing; a filter cavity is formed in the filter element; the liquid inlet is communicated with the liquid storage cavity; the liquid outlet is communicated with the filter cavity; and the liquid inlet axially deviates from the direction of the filter element. The urea metering pump filtering and pressure-stabilizing device is ingenious in design and fine in filtering effect, damage caused by impact of reducing agent pushed by a pump on filter paper is avoided by the liquid inlet in tangential arrangement, and the service life of the device is prolonged. Simultaneously, by the aid of a dual-seal structure, seepage of the reducing agent and impurities is prevented effectively, the effects of sealing and pressure stabilization are achieved, and the spray precision of a downstream metering valve of a filter is improved.
Description
Technical field
The utility model relates to a kind of exhaust gas from diesel vehicle post-processing purifying system, relates in particular to that the urea measuring pump filters and stable-pressure device in a kind of SCR system.
Background technology
Existing known; Nitrogen oxide through in SCR technology (SCR) the minimizing internal combustion engine especially diesel engine vent gas is a kind of general technology path; Be about to reducing agent (aqueous solution of urea) through atomizing metered injection intake and exhaust pipeline; And through the SCR catalyst the main pernicious gas NOX in the waste gas is changed into the nitrogen G&W and discharge, reach the purpose of tail gas clean-up.
Wherein, reducing agent is accurately to control injection through the measuring fixed amount valve, and metering valve is a kind of accurate control assembly; Can not receive contaminating impurity in the aqueous solution of urea, so the metering valve upper reaches often to be provided with filter, the impurity that is mixed in the reducing agent is filtered removing; The common filter of prior art comprises housing, filter core and end cap, and filter core is arranged in the housing, and filter core comprises skeleton and filter paper; Filter paper packet is trapped among the outside of skeleton, and housing is provided with inlet, if inlet vertically is provided with; Spray over against filter paper, filter paper is damaged easily, and service life is shorter; Because filter cartridge construction is unreasonable, easy impurity with some filtrations is retained in filter core or the end cap in cleaning course in addition, operating difficulties when cleaning.
Simultaneously; In the urea-spray process, metering valve will reach the effect of accurate control, must accurately control the metered injection amount; Metered injection amount pressure difference (pressure differential of metering valve upstream and downstream) influences with the electric pulse pulsewidth that the driving metering valve is opened; The control of pulsewidth mainly relies on circuit control, realized different control methods in the prior art, so the control of pressure reduction is the principal element that influences the metered injection amount.For constant flow, as long as pressure reduction is constant, the pulse width that metering valve is opened also remains unchanged; If pressure reduction changes,, must carry out dynamic adjustments by paired pulses in order to safeguard flow unchanged; And frequent dynamic adjustments can cause that error in dipping becomes big, in order to reduce dynamic adjustments, must carry out voltage stabilizing to the metering valve inlet pressure; And in the reality owing to the demanding reason of integrated level, the metering valve import often is exactly the outlet of filter, therefore the voltage stabilizing to reducing agent in the filter at the metering valve upper reaches seems particularly important; And in the prior art owing to adopt diaphragm pump as power set; Diaphragm pump pressure fluctuation is big, and cleaner often forms big pressure oscillation in filter process, influenced the accurate injection of metering valve.
The utility model content
The purpose of the utility model is to have overcome above-mentioned shortcoming of the prior art, provides a kind of design ingenious, filters, voltage regulation result is good, and the urea measuring pump filters and stable-pressure device in the SCR system of long service life.
To achieve these goals, the utility model provides that the urea measuring pump filters and stable-pressure device in a kind of SCR system, comprises housing, end cap and filter core; Said filter core is arranged in the said housing; The said housing of said end cap seal, said housing is provided with inlet and liquid outlet, forms liquid storage cylinder between said filter core and the housing; Form filter chamber in the said filter core; Said inlet is communicated with said liquid storage cylinder, and said liquid outlet is communicated with said filter chamber, it is characterized in that: said inlet axis direction upper offset is in said filter core direction.
Preferably, said inlet be set to the tangent direction of said inner walls on, the tangential is provided with that adherent entering housing forms buffering when making reducing agent stream through inlet, prevents vertical the entering and causes and obvious pressure oscillation housing in help playing voltage regulation result.
Preferably; Said filter core comprises skeleton and filter paper; Said skeleton is by upper skeleton, lower skeleton and be connected upper skeleton and the mandrel of lower skeleton is formed, and said upper skeleton and lower skeleton are disc structure, and said mandrel is the porous column structure; Said filter paper is arranged between said upper skeleton and the lower skeleton, and places the peripheral part of said mandrel.
More preferably, said filter paper is set to the paper folding shape structure that formed by a plurality of " W " structure, and its material is a filtering material, and best with nonwoven cloth material, wherein paper folding shape structure helps increasing filtration contact area, to hold more pollution impurity.
Preferably; Said inner walls is provided with first step portion and second step portion; Said first step portion is formed on the inwall circumferencial direction of said housing near said end cap one end; Said second step portion is formed on the inwall circumferencial direction of said housing away from said end cap one end, and the internal diameter of said first step portion is greater than said second step portion internal diameter, and said filter core is installed in the said housing through first step portion and said second step portion.
Preferably; Form first groove on the said upper skeleton circumferencial direction, be provided with first sealing ring in said first groove, form second groove on the said lower skeleton circumferencial direction; Be provided with second sealing ring in said second groove; Dual-seal can prevent effectively that on the one hand gas from leaking, and utilizes the cushioning effect of gas to play voltage regulation result, prevents also that on the other hand the foreign material end caps that flows is infected with on end cap and causes the illusion of filtering material breakage or poor filtration effect.
Preferably, some apertures are set evenly on the said mandrel, the liquid communication after being used to filter, said filter chamber is made up of hole on filter paper, the mandrel and mandrel inner chamber.
More preferably, said filter core upper end is provided with boss, and said boss is provided with the hole, cooperates said boss to form recess on the said end cap, can be easily filter core pull in the housing be come out through the hole on the said boss, is convenient to safeguard and changes.
The urea measuring pump filters and ingenious, the good filtration effect of stable-pressure device structural design in the utility model SCR system; Inlet be set to the tangent direction of inner walls on; Avoided reducing agent the impact of filter paper to be caused damage under the propelling movement of pump, increased the service life, double sealing structure not only effectively prevents the seepage of reducing agent and impurity simultaneously; Also play the effect of sealing voltage stabilizing, improved the accuracy of spray of cleaner downstream metering valve.
Description of drawings:
Fig. 1 is the utility model and metering valve mounting structure sketch map
Fig. 2 is an A-A direction cutaway view among Fig. 1
The specific embodiment:
In order more to be expressly understood the technology contents of the utility model, the special following examples of lifting specify.
Like Fig. 1-shown in Figure 2, the utility model relates to that the urea measuring pump filters and stable-pressure device in a kind of SCR system, comprises housing 2, end cap 3 and is arranged on the filter core 4 in the housing 2; Said end cap 3 is used to seal said housing 2, and said filter core 4 comprises skeleton 5 and filter paper 6, and said housing 2 is the open barrel-like structure in upper end; Said housing 2 is provided with inlet 7 and liquid outlet 8, and said inlet 7 is arranged on the sidewall of said housing 2, and said liquid outlet 8 is arranged on the bottom of said housing 2; Said filtration is connected with the metering valve inlet in its downstream through said liquid outlet 8 with stable-pressure device; Gap between the filter paper 6 in the said housing 2 and said skeleton 5 outsides constitutes liquid storage cylinder 9, and said liquid storage cylinder 9 is used to store the reducing agent before filtering, and forms filter chamber 41 in the said filter core 4; Said filter paper 6 is made up of filtering material; Be used for the reducing agent in the liquid storage cylinder 9 is filtered, said inlet 7 is communicated with said liquid storage cylinder 9, and said liquid outlet is communicated with said filter chamber 41; Said inlet 7 axis place direction upper offset is the initial point direction in said filter core place, avoids causing the excessive phenomenon of damaging filter paper 6 of injection of reducing agent injection pressure because of inlet 7 with said housing 2 vertical settings; Simultaneously, reducing agent is setovered after said mandrel direction gets into liquid storage cylinder 9, and adherent mobile formation buffering prevents vertically to get into disturbance liquid and build-up of pressure obviously fluctuates, and plays voltage regulation result.
Fig. 1, Fig. 2 are the utility model preferred embodiments, and the 7 place axis of inlet described in the present embodiment are arranged on the tangential direction of said housing 2 inwalls place circumference, so at utmost avoid reducing agent spraying power to act directly on the filter paper 6.
In this specific embodiment, said filter core 4 comprises skeleton 5 and filter paper 6, and said skeleton 5 comprises upper skeleton 11, lower skeleton 12 and mandrel 13; Said upper skeleton 11 is a disc structure with lower skeleton 12; Said mandrel 13 is the porous column structure, and said filter paper 6 is paper folding shape structure, is arranged between said upper skeleton 11 and the lower skeleton 12; And place the peripheral part of said mandrel 13; Its two ends be tightly connected respectively upper skeleton 11 and lower skeleton 12, the reducing agents in 6 pairs of liquid storage cylinders of said filter paper 9 carry out filter cleaning, and its paper folding shape structure can increase filter area, improve filter effect; Filter paper adopts and can process with the compatible filtering material of aqueous solution of urea in this specific embodiment, and is best with nonwoven cloth material; Simultaneously; In order to prevent reducing agent freezing and expansion in the winter time, broken number that can paper folding is set to some, and quantity is few more; Angle between every folding is big more; Just leave enough gaps between folding and the folding,, be set to 20 foldings in this specific embodiment even reducing agent (aqueous solution of urea) freezing and expansion can not damage filter paper yet.
Like Fig. 1, shown in Figure 2; Some apertures 16 evenly are set on the said mandrel 13; Reducing agent after being used to filter flows in the cavity in the mandrel 13, and aperture 16 and mandrel inner chamber on said filter paper 6, the mandrel constitute filter chamber 41, and said inlet 7, liquid storage cylinder 9, filter paper 6, filter chamber 41 and liquid outlet 8 constitute the filtration system for the distribution of commodities of reducing agents; Wherein filter paper 6 plays the filter cleaning effect, and the reducing agent after the filtration flows in the metering valve in cleaner downstream through liquid outlet 8.
As shown in Figure 1, said housing 2 forms helicitic texture with said end cap 3 cooperation places, correspondingly; Said end cap 3 inboards also form helicitic texture; End cap 3 is provided with gasket seal 10 through the said housing 2 of seal with screwed joint between said housing 2 and the said end cap 3, prevents the leakage of leaking gas.
As shown in Figure 1; First step portion 17 and second step portion 18 are arranged on said housing 2 inwalls; Said first step portion 17 is formed on the inwall circumferencial direction of said housing 2 near said end cap 3 one ends, and said second step portion 18 is formed on the inwall circumferencial direction of said housing 2 away from said end cap 3 one ends, and the internal diameter of said first step portion 17 is slightly larger than said second step portion 18 internal diameters; Said filter core upper skeleton 11 is arranged on first step portion 17 places; Said lower skeleton 12 is arranged on second step portion 18 places, and correspondingly, upper skeleton 11 somewhat larger in diameter are in lower skeleton 12 diameters; So both can be conveniently the fixing position of filter core 4, prevent that also impurity got in the solution after filtering when filter core 4 from pulling out.
As shown in Figure 1; Be formed with first groove 14 on the said upper skeleton circumferencial direction; The connection that is provided with between 31 pairs of housings 2 of first sealing ring, 31, the first sealing rings and the upper skeleton 11 in said first groove 14 seals, and both can prevent that the reducing agent in the liquid storage cylinder 9 from flowing in the space between upper skeleton and the end cap under pressure; Can prevent that again the air in the filter chamber from leaking, and plays the effect of voltage stabilizing; Also form second groove 15 on the said lower skeleton circumferencial direction; Be provided with second sealing ring 32 in said second groove 15; Connection between housing 2 and the lower skeleton 12 seals; The setting of second sealing ring 32 is in the reducing agent that prevents after liquid storage cylinder 9 interior reducing agents from flowing into filtration under pressure, also plays the effect of sealing voltage stabilizing simultaneously.
More preferably, said filter core upper end is provided with boss 19, and said boss 19 is provided with hole 20; Cooperate said boss to form recess 21 on the said end cap; When needs clean filter core, only need cord or iron wire be passed the hole 20 on the boss 19, filter core is pulled out gently get final product then.
To sum up; The urea measuring pump filters and ingenious, the good filtration effect of stable-pressure device design in the utility model SCR system; Inlet be set to the tangent direction of inner walls on, avoided reducing agent to cause the damage of filter core because of expulsion pressure is excessive, prolonged the service life of cleaner; Double sealing structure prevents the seepage of reducing agent and impurity, has also played the effect of voltage stabilizing simultaneously, improves the accuracy of spray of cleaner downstream metering valve.
In this specification; The utility model only is described with reference to its certain embodiments, still, still can make various modifications and conversion obviously and does not deviate from the spirit and the scope of the utility model; Therefore, the utility model specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (8)
1.SCR the urea measuring pump filters and stable-pressure device in the system, comprises housing, end cap and filter core, said filter core is arranged in the said housing; The said housing of said end cap seal, said housing is provided with inlet and liquid outlet, forms liquid storage cylinder between said filter core and the housing; Form filter chamber in the said filter core; Said inlet is communicated with said liquid storage cylinder, and said liquid outlet is communicated with said filter chamber, it is characterized in that: said inlet axis direction upper offset is in said filter core direction.
2. the urea measuring pump filters and stable-pressure device in the SCR according to claim 1 system, it is characterized in that: said inlet be set to the tangent direction of said inner walls on.
3. the urea measuring pump filters and stable-pressure device in the SCR according to claim 1 and 2 system; It is characterized in that: said filter core comprises skeleton and filter paper; Said skeleton is by upper skeleton, lower skeleton and be connected upper skeleton and the mandrel of lower skeleton is formed, and said upper skeleton and lower skeleton are disc structure, and said mandrel is the porous column structure; Said filter paper is arranged between said upper skeleton and the lower skeleton, and places the peripheral part of said mandrel.
4. the urea measuring pump filters and stable-pressure device in the SCR according to claim 3 system, it is characterized in that: said filter paper is set to the paper folding shape structure that formed by a plurality of " W " structure, and its material is a filtering material.
5. filter and stable-pressure device according to urea measuring pump in claim 1 or the 4 described SCR systems; It is characterized in that: said inner walls is provided with first step portion and second step portion; Said first step portion is formed on the inwall circumferencial direction of said housing near said end cap one end; Said second step portion is formed on the inwall circumferencial direction of said housing away from said end cap one end; The internal diameter of said first step portion is greater than said second step portion internal diameter, and said filter core is installed in the said housing through first step portion and said second step portion.
6. the urea measuring pump filters and stable-pressure device in the SCR according to claim 5 system; It is characterized in that: form first groove on the said upper skeleton circumferencial direction; Be provided with first sealing ring in said first groove; Form second groove on the said lower skeleton circumferencial direction, be provided with second sealing ring in said second groove.
7. filter and stable-pressure device according to urea measuring pump in claim 4 or the 6 described SCR systems; It is characterized in that: some apertures evenly are set on the said mandrel; Liquid communication after being used to filter, said filter chamber is made up of aperture on filter paper, the mandrel and mandrel inner chamber.
8. filter and stable-pressure device according to urea measuring pump in claim 1 or the 4 or 6 described SCR systems, it is characterized in that: said filter core upper end is provided with boss, and said boss is provided with the hole, cooperates said boss to form recess on the said end cap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200298756U CN202113780U (en) | 2011-01-28 | 2011-01-28 | Urea metering pump filtering and pressure-stabilizing device in SCR (selective catalytic reduction) system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200298756U CN202113780U (en) | 2011-01-28 | 2011-01-28 | Urea metering pump filtering and pressure-stabilizing device in SCR (selective catalytic reduction) system |
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| Publication Number | Publication Date |
|---|---|
| CN202113780U true CN202113780U (en) | 2012-01-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200298756U Expired - Fee Related CN202113780U (en) | 2011-01-28 | 2011-01-28 | Urea metering pump filtering and pressure-stabilizing device in SCR (selective catalytic reduction) system |
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| Country | Link |
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| CN (1) | CN202113780U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102764528A (en) * | 2012-07-10 | 2012-11-07 | 湖州德翔环境科技有限公司 | Large-flux filter element and filter |
| WO2019028944A1 (en) * | 2017-08-11 | 2019-02-14 | 天纳克（苏州）排放系统有限公司 | Built-in urea supply device |
| CN110548326A (en) * | 2018-05-30 | 2019-12-10 | 杜玮 | Filtering device for urea metering pump and urea metering pump |
| CN113491895A (en) * | 2020-03-21 | 2021-10-12 | 芜湖美的厨卫电器制造有限公司 | Filter element assembly, filter and water heater |
-
2011
- 2011-01-28 CN CN2011200298756U patent/CN202113780U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102764528A (en) * | 2012-07-10 | 2012-11-07 | 湖州德翔环境科技有限公司 | Large-flux filter element and filter |
| WO2019028944A1 (en) * | 2017-08-11 | 2019-02-14 | 天纳克（苏州）排放系统有限公司 | Built-in urea supply device |
| CN110548326A (en) * | 2018-05-30 | 2019-12-10 | 杜玮 | Filtering device for urea metering pump and urea metering pump |
| CN110548326B (en) * | 2018-05-30 | 2021-11-26 | 西安秦泰汽车排放技术有限公司 | Filtering device for urea metering pump and urea metering pump |
| CN113491895A (en) * | 2020-03-21 | 2021-10-12 | 芜湖美的厨卫电器制造有限公司 | Filter element assembly, filter and water heater |
| CN113491895B (en) * | 2020-03-21 | 2022-05-24 | 芜湖美的厨卫电器制造有限公司 | Filter element assembly, filter and water heater |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 215211, No. 666, Fen Yue Road, Fen Hu Town, Wujiang, Jiangsu Patentee after: Suzhou PowerGreen Emission Solution System Co., Ltd. Address before: 215211 Wujiang City, Jiangsu province FENHU Economic Development Zone, the community Fen Road No. 666 Patentee before: Suzhou PowerGreen Emission Solution System Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120118 Termination date: 20180128 |