CN203822426U - Device for preventing urea water from backflow and crystallization - Google Patents
Device for preventing urea water from backflow and crystallization Download PDFInfo
- Publication number
- CN203822426U CN203822426U CN201420090328.2U CN201420090328U CN203822426U CN 203822426 U CN203822426 U CN 203822426U CN 201420090328 U CN201420090328 U CN 201420090328U CN 203822426 U CN203822426 U CN 203822426U
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- China
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- urea water
- air
- way
- reversing valve
- way reversing
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Abstract
The utility model discloses a device for preventing urea water from backflow and crystallization. The device comprises a three-way reversing valve, wherein the three-way reversing valve comprises a three-way reversing valve sleeve, the three-way reversing valve sleeve comprises an air inlet and an air outlet formed in the two ends of the three-way reversing valve sleeve respectively, symmetric draught holes formed in the two sides of the three-way reversing valve sleeve, and a dead-end tube arranged inside the three-way reversing valve, wherein the open end of the dead-end tube is communicated with the air inlet, an air inlet hole is formed in a side surface of the dead-end tube, the dead-end tube is sleeved with an elastic non-metal pipeline section, the air inlet is connected with a two-position three-way valve, and the air outlet is connected with a pressure cavity. According to the device provided by the utility model, on one hand, urea water is prevented from back flowing into the interior of the two-position three-way valve of a system actuator to form urea crystallization and pipeline blockage, which can reduce the durability and shorten the service life, on the other hand, the device provided by the utility model cannot influence continuous liquid charging and discharging inside the pressure cavity.
Description
Technical field
The utility model belongs to diesel engine vent gas discharged nitrous oxides pollution control equipment field, relates in particular to a kind of device that prevents urea water refluence crystallization.
Background technique
The thermal efficiency of diesel engine Yin Qigao is widely used in all trades and professions, but its higher nitrogen oxide (NOx) discharge is a problem that perplexs for a long time people.Selective catalysis reduction technique (SCR) is the effective ways of controlling diesel engine discharged nitrous oxides, this technology is used certain density aqueous solution of urea to spray in diesel exhaust gas conventionally, carries out selective catalytic reduction reaction reduction NOx be discharged into the concentration in atmosphere environment with nitrogen oxide wherein in SCR catalyst converter.
A kind of gas that present stage is utilized helps in formula SCR urea water adding set, each pressure chamber makes urea water wherein spray into completely in outlet pipe under compressed air-driven, afterwards in gas exchange process, the residual urea water that pressurized air in pressure chamber can carry contact with it enters two position three-way valve through admission line, and makes part urea water rest on formation crystalline solid in two position three-way valve.Through use after a while, the crystalline solid in this two position three-way valve is grown up and is become large, until spool is blocked or blocked the path of valve.
Therefore the crystalline solid, forming because urea water flows backwards for the performer of avoiding in SCR adding set causes and cannot normally work, durability reduces, minimizing in working life, need to take a kind of device that prevents urea water refluence crystallization.
Model utility content
The purpose of this utility model is to provide a kind of device that prevents urea water refluence crystallization, to solve the above-mentioned defect existing in prior art.
For realizing the purpose of this utility model, the utility model provides a kind of device that prevents urea water refluence crystallization, described device comprises a three-way diverter valve, described three-way diverter valve comprises triplet commutation valve cage, described triplet commutation valve cage comprises the suction port and the air outlet that are arranged at respectively described triplet commutation valve cage two ends, be arranged at the symmetrical air-vent of described triplet commutation valve cage both sides, be arranged at the blind pipe of described three-way diverter valve inside, the opening end of described blind pipe communicates with described suction port, its side has inlet hole, on described blind pipe, overlap flexible nonmetal pipeline section, described suction port is connected with two position three-way valve, described air outlet is connected with pressure chamber, in the time that pressurized air enters described suction port from described two position three-way valve, described pressurized air is from air-vent described in described inlet hole discharge and described nonmetal pipeline section expansion plugging, and described pressurized air enters described pressure chamber from described air outlet, in the time that pressurized air stops entering described suction port from described two position three-way valve, inlet hole described in described nonmetal pipeline section collapsed seal, the urea water that the pressurized air returning from described pressure chamber carries contact with it blows back into described air outlet, and discharges from described air-vent.
The utility model, compared with prior art, have on the one hand the urea water of prevention flow backwards enter that system performer two position three-way valve innerly forms urea crystals and blocking pipeline, makes it that durability reduces, reduce working life, on the other hand, the utility model can not affect pressure chamber and charge and discharge continuously liquid.
Brief description of the drawings
Fig. 1 is the utility model structural representation a;
Fig. 2 is the utility model structural representation b;
In figure, 1-suction port, 2-triplet commutation valve cage, 3-air-vent, 4-air outlet, the nonmetal pipeline section of 5-, 6-inlet hole, 7-blind pipe.
Embodiment
In order to make the purpose of this utility model, technological scheme and beneficial effect clearer, below in conjunction with embodiment, the utility model is further elaborated.Should be understood to specific embodiment described herein only in order to explain the utility model, be not limited to protection domain of the present utility model.
As shown in Figure 1 and Figure 2, the air direct when arrow in Fig. 1 is pressurized air extruding urea water, the arrow in Fig. 2 is that pressurized air stops pushing after urea water, pressurized air return air trend.The utility model is for preventing that diesel SCR after-treatment system gas from helping the method and apparatus of formula adding set urea water refluence crystallization, be achieved by the following technical programs, three-way diverter valve has three interfaces, and the blind pipe, one that comprise specifically a lateral opening hole are enclosed within the sleeve on blind pipe with flexible nonmetal pipeline section and a side opening symmetrical holes.Blind pipe one end and the gas of three-way diverter valve helps the two-position three way valve outlet port of formula urea water adding set to communicate, make pressurized air enter this blind pipe, hole by blind pipe side also makes the symmetrical holes of the elasticity pipeline section expansion plugging cartridges sides on it, and pressurized air flows out from elasticity pipeline section one end through triplet commutation valve outlet port and enters pressure chamber extruding urea water.After the urea water injection in pressure chamber finishes, two position three-way valve stops air feed, the hole of the rapid collapsed seal blind pipe of elasticity pipeline section side, and cartridges sides symmetrical holes is opened.Meanwhile, the urea water backflow that the pressurized air of pressure chamber inside can carry contact with it enters three-way diverter valve, flows out from the symmetrical holes of cartridges sides.
The utility model helps formula urea water adding set crystallisation problems with respect to existing gas, there is on the one hand the refluence of the urea water of prevention and enter inner urea crystals and the blocking pipeline of forming of system performer, on the other hand, the utility model can not affect pressure chamber and charges and discharge continuously liquid.
The metallic material that the utility model is selected is stainless steel.
Of the present utility model simple in structure, be easy to processing, highly versatile.
In the utility model, gas helps pressurized air in formula urea water adding set to enter three position directional valve suction port through two position three-way valve, and flow out and make the air-vent nonmetal pipeline section expansion plugging triplet commutation valve cage from the side inlet hole of blind pipe, pressurized air cannot be leaked.Only allow it to flow out from three position directional valve air outlet and enter pressure chamber extruding urea water.After the urea water injection in pressure chamber finishes, two position three-way valve stops air feed, the inlet hole of the rapid collapsed seal blind pipe of nonmetal pipeline section side, and the air-vent of cartridges sides is opened.Meanwhile, the urea water refluence that the pressurized air of pressure chamber inside can carry contact with it enters triplet commutation valve air gate, flows out from the air-vent of cartridges sides, and realization prevention urea water flows backwards and enters two position three-way valve crystallization.
The above is only preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (1)
1. one kind prevents the device of urea water refluence crystallization, it is characterized in that, described device comprises a three-way diverter valve, described three-way diverter valve comprises triplet commutation valve cage, described triplet commutation valve cage comprises the suction port and the air outlet that are arranged at respectively described triplet commutation valve cage two ends, be arranged at the symmetrical air-vent of described triplet commutation valve cage both sides, be arranged at the blind pipe of described three-way diverter valve inside, the opening end of described blind pipe communicates with described suction port, its side has inlet hole, on described blind pipe, overlap flexible nonmetal pipeline section, described suction port is connected with two position three-way valve, described air outlet is connected with pressure chamber, in the time that pressurized air enters described suction port from described two position three-way valve, described pressurized air is from air-vent described in described inlet hole discharge and described nonmetal pipeline section expansion plugging, and described pressurized air enters described pressure chamber from described air outlet, in the time that pressurized air stops entering described suction port from described two position three-way valve, inlet hole described in described nonmetal pipeline section collapsed seal, the urea water that the pressurized air returning from described pressure chamber carries contact with it blows back into described air outlet, and discharges from described air-vent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420090328.2U CN203822426U (en) | 2014-02-28 | 2014-02-28 | Device for preventing urea water from backflow and crystallization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420090328.2U CN203822426U (en) | 2014-02-28 | 2014-02-28 | Device for preventing urea water from backflow and crystallization |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203822426U true CN203822426U (en) | 2014-09-10 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420090328.2U Expired - Fee Related CN203822426U (en) | 2014-02-28 | 2014-02-28 | Device for preventing urea water from backflow and crystallization |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203822426U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103790681A (en) * | 2014-02-28 | 2014-05-14 | 中国人民解放军军事交通学院 | Device for preventing urea water from flowing back and crystallizing |
-
2014
- 2014-02-28 CN CN201420090328.2U patent/CN203822426U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103790681A (en) * | 2014-02-28 | 2014-05-14 | 中国人民解放军军事交通学院 | Device for preventing urea water from flowing back and crystallizing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140910 Termination date: 20190228 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |