CN217440138U - Diesel engine tail gas aftertreatment solvent supply module - Google Patents
Diesel engine tail gas aftertreatment solvent supply module Download PDFInfo
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- CN217440138U CN217440138U CN202220827372.1U CN202220827372U CN217440138U CN 217440138 U CN217440138 U CN 217440138U CN 202220827372 U CN202220827372 U CN 202220827372U CN 217440138 U CN217440138 U CN 217440138U
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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
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- Y02T10/12—Improving ICE efficiencies
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Abstract
The utility model discloses a diesel engine tail gas aftertreatment solvent supply module, including solvent case, diaphragm pump assembly, switching-over valve assembly, high pressure filtration attenuator assembly and sprayer, diaphragm pump assembly and switching-over valve assembly fluid intercommunication make the solvent get into behind the switching-over valve assembly through the diaphragm pump assembly pressure boost, are provided with two-way inlet and two-way liquid outlet on the switching-over valve assembly, and the solvent case passes through the feed line and communicates to two-way inlet, and two-way liquid outlet communicates to high pressure filtration attenuator assembly through the connecting line, and high pressure filtration attenuator assembly communicates through high-pressure output pipeline and sprayer. The diesel engine tail gas aftertreatment solvent supply module adopts the diaphragm pump assembly, the reversing valve assembly and the high-pressure filter attenuator assembly to realize reversible liquid supply and reverse pumping functions in the solvent conveying direction, and provides technical support for high-precision and high-efficiency emission control through a triple pressure stabilizing technology of low-pressure input pressure stabilization, high-pressure output pressure stabilization and hydraulic backflow pressure stabilization.
Description
Technical Field
The utility model relates to a diesel engine tail gas aftertreatment technical field especially relates to a diesel engine tail gas aftertreatment solvent supply module.
Background
Driven by increasingly stringent emissions regulations and dual carbon policies, minimizing diesel exhaust emissions while increasing diesel fuel efficiency has become an irresistible trend in technology development, which has led to the adoption of high efficiency SCR technology as a necessary choice for diesel exhaust emissions. In the VI stage of China, the conversion efficiency of the SCR is required to be more than 96%, and in the upgrading of diesel engines in two or three years in the future and the VII stage of China, the conversion efficiency of the SCR is required to be more than 99% quickly, so that the coating performance of the SCR catalytic reactor is required to be improved, the injection control precision of the urea solvent serving as a catalytic reactant is also required to be improved, and a urea solvent supply module with better liquid supply performance and more stability is required. In addition, in order to prevent the urea solvent from crystallizing and freezing at low temperature to damage the device, the urea solvent in the supply pipeline and the supply module needs to be cleaned or purged when the diesel engine does not work, and the urea solvent supply module is required to have a back pumping or purging function.
In order to realize the functions, the prior art is generally realized by adding a reversing valve and an auxiliary back-suction pump on the basis of a gear pump and a diaphragm pump, but the problems of urea crystallization and insufficient metering precision of urea solvent in different degrees exist in any route, and further improvement is needed.
SUMMERY OF THE UTILITY MODEL
Based on the problem, the utility model aims to provide a module is supplied with to diesel engine tail gas aftertreatment solvent improves urea solvent injection pressure stability and the accuracy nature of injection quantity.
In order to achieve the purpose, the utility model adopts the following technical proposal:
the utility model provides a module is supplied with to diesel engine tail gas aftertreatment solvent, it includes the solvent case, the diaphragm pump assembly, the switching-over valve assembly, high pressure filtration attenuator assembly and sprayer, diaphragm pump assembly and switching-over valve assembly fluid intercommunication, make the solvent get into behind the switching-over valve assembly through the diaphragm pump assembly pressure boost, be provided with two-way inlet and two-way liquid outlet on the switching-over valve assembly, the solvent case passes through the feed pipeline and communicates to two-way inlet, two-way liquid outlet communicates to high pressure filtration attenuator assembly through the connecting line, high pressure filtration attenuator assembly communicates with the sprayer through high pressure output pipeline.
Particularly, the diaphragm pump assembly comprises a driving motor and a diaphragm pump, the driving motor drives a diaphragm in the diaphragm pump to swing back and forth to realize solvent suction and pumping, a liquid inlet cavity of the diaphragm pump is adjacent to the low-pressure attenuation cavity, the two cavities are communicated through the attenuation cavity metering hole, a pump liquid inlet is formed in the low-pressure attenuation cavity, and a pump liquid outlet is formed in a liquid outlet cavity of the diaphragm pump.
In particular, the low-pressure attenuation cavity is also adjacent to the low-pressure resonant cavity, the two cavities are separated by the broadband attenuation diaphragm, and the low-pressure resonant cavity is provided with a resonance metering hole.
Particularly, the reversing valve assembly comprises a first reversing valve cavity and a second reversing valve cavity, a bidirectional liquid inlet is arranged on the first reversing valve cavity, a first channel and a second channel are led out of the first reversing valve cavity, a bidirectional liquid outlet is arranged on the second reversing valve cavity, a third channel and a fourth channel are led out of the second reversing valve cavity, the second channel and the third channel are converged and communicated with the liquid inlet of the pump, the first channel and the fourth channel are converged and communicated with the liquid outlet of the pump, reversing valve plates are arranged in the first reversing valve cavity and the second reversing valve cavity respectively, and the two reversing valve plates are linked through an electromagnetic valve to achieve the effect that the first channel and the third channel are closed simultaneously or the second channel and the fourth channel are closed simultaneously.
Particularly, the high-pressure filter attenuator assembly comprises a high-pressure filter and a high-pressure attenuator, the inner cavity of the high-pressure filter is communicated with the high-pressure attenuator, the high-pressure attenuator is connected with a voltage stabilizing cavity, a high-pressure output pipeline is connected out of the voltage stabilizing cavity, a backflow metering hole is formed in the voltage stabilizing cavity, and the backflow metering hole is connected to the solvent tank through a backflow pipeline.
In particular, the high-pressure attenuator also abuts against a buffer chamber, which is provided with a vent hole.
In particular, the high-pressure attenuator is of a hollow cylindrical structure and is embedded in the high-pressure filter and used for filtering and stabilizing pressure fluctuation of a solvent at the downstream of the high-pressure filter.
In particular, the port of the liquid supply line is provided with a filter.
To sum up, the beneficial effects of the utility model are that, diesel engine tail gas aftertreatment solvent supply module adopts diaphragm pump assembly, switching-over valve assembly, high pressure filtration attenuator assembly to realize that solvent direction of delivery is reversible supplies liquid and the function of taking out of turning over, and low pressure wide band attenuator and low pressure resonant cavity through accurate design, the pressure oscillation of feed liquor low pressure pipeline has been eliminated, through the high pressure attenuator who inherits with high pressure filter, the pressure oscillation of high pressure output pipeline has been eliminated, the high stability of solvent supply system output pressure has been realized, for high accuracy, high efficiency discharge control provides technical guarantee, compact structure, move safe and reliable more, also be favorable to realizing the high efficiency control of diesel engine tail gas.
Drawings
Fig. 1 is a schematic structural diagram of a diesel engine exhaust aftertreatment solvent supply module according to an embodiment of the present invention;
fig. 2 is a schematic view of a diaphragm pump assembly in a diesel exhaust aftertreatment solvent supply module according to an embodiment of the present invention;
fig. 3 is a schematic view of a reversing valve assembly in a diesel engine exhaust aftertreatment solvent supply module according to an embodiment of the present invention in a liquid supply state;
fig. 4 is a schematic view of a reversing valve assembly in a diesel engine exhaust aftertreatment solvent supply module according to an embodiment of the present invention in a reverse pumping state;
fig. 5 is a schematic view of a high-pressure filter attenuator assembly in a diesel engine exhaust aftertreatment solvent supply module according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar parts throughout, or parts having the same or similar functions. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly and can include, for example, fixed or removable connections, mechanical or electrical connections, direct connections, indirect connections through an intermediary, communication between two elements, or an interaction between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the description of the present invention, unless otherwise expressly specified or limited, the first feature "on" or "under" the second feature may include both the first and second features being in direct contact, and may also include the first and second features being in contact, not in direct contact, but with another feature therebetween. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
Referring to fig. 1, the present preferred embodiment provides a solvent supply module for diesel exhaust gas post-treatment, which includes a solvent tank 1, a diaphragm pump assembly 2, a reversing valve assembly 3, a high-pressure filter attenuator assembly 4, and an injector 5.
The diaphragm pump assembly 2 is in fluid communication with the reversing valve assembly 3, so that a solvent enters the reversing valve assembly 3 and then is pressurized through the diaphragm pump assembly 2, the reversing valve assembly 3 is provided with a bidirectional liquid inlet 33 and a bidirectional liquid outlet 36, the solvent tank 1 is communicated to the bidirectional liquid inlet 33 through a liquid supply pipeline 6, a filter is arranged at a port of the liquid supply pipeline 6, the bidirectional liquid outlet 36 is communicated to the high-pressure filter attenuator assembly 4 through a connecting pipeline 7, and the high-pressure filter attenuator assembly 4 is communicated with the ejector 5 through a high-pressure output pipeline 8.
As shown in fig. 2, the diaphragm pump assembly 2 includes a driving motor 21 and a diaphragm pump 22, the driving motor 21 drives the diaphragm in the diaphragm pump 22 to move back and forth to suck and pump the solvent, a liquid inlet cavity 23 of the diaphragm pump 22 is adjacent to a low-pressure attenuation cavity 25, the two cavities are communicated through an attenuation cavity metering hole 26, a pump liquid inlet is arranged on the low-pressure attenuation cavity 25, and a pump liquid outlet is arranged on a liquid outlet cavity 24 of the diaphragm pump 22.
Further, the low-pressure attenuation cavity 25 is adjacent to a low-pressure resonant cavity 27, the two cavities are separated by a broadband attenuation diaphragm 28, and a resonant metering hole 29 is formed in the low-pressure resonant cavity 27.
Specifically, the low-pressure attenuation cavity 25, the broadband attenuation diaphragm 28 and the attenuation cavity metering hole 26 constitute a low-pressure broadband attenuator, and when a low-pressure solvent from the liquid inlet of the pump flows through the low-pressure attenuation cavity 25, the low-pressure attenuator can filter and eliminate pressure fluctuation of the solvent, so that the stabilized solvent enters the liquid inlet cavity 23 of the diaphragm pump 22 through the attenuation cavity metering hole 26, and the working stability of the diaphragm pump 22 is ensured.
The low-pressure resonant cavity 27 and the resonance metering hole 29 form a low-pressure resonator, the low-pressure resonator is connected with the low-pressure broadband attenuator in series, pressure fluctuation in a specific frequency range can be filtered, the combination of the low-pressure resonator and the low-pressure broadband attenuator can further improve the filtering performance of the low-pressure attenuation cavity 25, the low-pressure liquid inlet pressure of the liquid inlet cavity 23 is better stabilized, the diaphragm pump 22 is made to have higher volumetric efficiency and performance, and high-pressure solvent with more accurate flow and more stable pressure is output from the liquid outlet cavity 24.
The reversing valve assembly 3 comprises a first reversing valve cavity 31 and a second reversing valve cavity 32, a bidirectional liquid inlet 33 is arranged on the first reversing valve cavity 31, a first channel 34 and a second channel 35 are led out from the first reversing valve cavity 31, a bidirectional liquid outlet 36 is arranged on the second reversing valve cavity 32, a third channel 37 and a fourth channel 28 are led out from the second reversing valve cavity 32, the second channel 35 and the third channel 37 are converged and communicated with a pump liquid inlet, the first channel 34 and the fourth channel 28 are converged and communicated with a pump liquid outlet, reversing valve plates 39 are respectively arranged in the first reversing valve cavity 31 and the second reversing valve cavity 32, and the two reversing valve plates 39 are linked through an electromagnetic valve to realize the simultaneous closing of the first channel 34 and the third channel 37 or the simultaneous closing of the second channel 35 and the fourth channel 28.
Specifically, when the electromagnetic valve is not energized, the reversing valve assembly 3 is in a liquid supply state (i.e., flowing in a forward direction), as shown in fig. 3, the reversing valve sheet 39 closes the first channel 34 and the third channel 37, the bidirectional liquid inlet 33 is communicated with the second channel 35, and the bidirectional liquid outlet 36 is communicated with the fourth channel 28; when the electromagnetic valve is energized, the reversing valve assembly 3 is in a reverse pumping state (i.e., reverse flow), as shown in fig. 4, the reversing valve sheet 39 closes the second channel 35 and the fourth channel 28, the bidirectional inlet 33 is communicated with the first channel 34, and the bidirectional outlet 36 is communicated with the third channel 37.
As shown in fig. 5, the high-pressure filter attenuator assembly 4 includes a high-pressure filter 41 and a high-pressure attenuator 42, an inner cavity of the high-pressure filter 41 is communicated with the high-pressure attenuator 42, the high-pressure attenuator 42 is connected with a voltage stabilizing cavity 43, a high-pressure output pipeline 8 is connected out from the voltage stabilizing cavity 43, a backflow metering hole 44 is arranged on the voltage stabilizing cavity 43, the backflow metering hole 44 is connected to the solvent tank 1 through a backflow pipeline 9, the high-pressure attenuator 42 is adjacent to a buffer cavity 45, and a vent hole 46 is arranged on the buffer cavity 45.
In particular, the high-pressure attenuator 42 is a hollow cylindrical structure and is embedded in the high-pressure filter 41 for filtering and stabilizing pressure fluctuations of the solvent downstream of the high-pressure filter 41.
Specifically, when the high-pressure fluctuation from the high-pressure filter 41 passes through the high-pressure attenuator 42, the pressure fluctuation is absorbed by the high-pressure attenuator 42, and after the high-pressure solvent after pressure stabilization enters the pressure stabilizing cavity 43, part of the solvent flows back to the solvent tank 1 through the backflow metering hole 44 to play a further pressure stabilizing role.
The working principle is as follows:
when the solvent supply module is applied to a diesel exhaust aftertreatment system, the upstream thereof is connected to a supply line 6 from the solvent tank 1 and the downstream thereof is connected to a high-pressure outlet line 8 to the injector 5. The function of the device is to suck urea solvent from a solvent tank 1 according to a control command, and output high-pressure solvent to an injector 5 after pressurization; or, according to the control command, the solvent in the ejector 5 and its upstream piping and devices is sucked back into the solvent tank 1.
When the diesel engine normally operates, the electromagnetic valve is not electrified and excited, the reversing valve assembly 3 is in a liquid supply state, the diaphragm pump assembly 2 acts to suck the urea solvent, the urea solvent is output from the solvent tank 1 through the liquid supply pipeline 6 and the reversing valve assembly 3 to enter the low-pressure attenuation cavity 25 of the diaphragm pump assembly 2, the urea solvent enters the diaphragm pump 22 to be pressurized after filtering and pressure stabilization, and the pressurized solvent is output from the reversing valve assembly 3; the high-pressure solvent enters the high-pressure filter attenuator assembly 4 again, is filtered through the high-pressure filter 41, and then enters the pressure stabilizing cavity 43 after passing through the high-pressure attenuator 42 for pressure stabilization, part of the solvent is conveyed to the ejector 5 through the high-pressure output pipeline 8, the accurate metering injection is carried out according to the tail gas treatment requirement of the diesel engine, the rest part flows back to the solvent tank 1 through the backflow metering hole 44, and the backflow metering hole 44 has the functions of backflow and pressure stabilization in the pressure stabilizing cavity 43.
When the diesel engine is shut down, the SCR system controls the urea solvent supply module to be in a reverse pumping state within a certain time when the shut-down switch is turned off. At the moment, the electromagnetic valve is electrified and excited, the reversing valve assembly 3 works in a reverse pumping state, the diaphragm pump assembly 2 acts to pump the urea solvent, the ejector 5 and the upstream pipelines and devices thereof, including the high-pressure output pipeline 8, the high-pressure filtration attenuator assembly 4 and the urea solvent in the reversing valve assembly 3, are pumped out reversely and are sent back to the solvent tank 1 through the liquid supply pipeline 6, and therefore urea in the pipelines and devices of the whole system is prevented from being crystallized or frozen to damage the pipelines and devices.
In conclusion, the diesel engine tail gas aftertreatment solvent adopts the diaphragm pump assembly, the reversing valve assembly and the high-pressure filter attenuator assembly to realize reversible liquid supply and back pumping functions in the solvent conveying direction, the pressure fluctuation of a liquid inlet low-pressure pipeline is eliminated through the accurately designed low-pressure broadband attenuator and the low-pressure resonant cavity, the pressure fluctuation of a high-pressure output pipeline is eliminated through the high-pressure attenuator inherited by the high-pressure filter, the high stability of the output pressure of a solvent supply system is realized, the technical guarantee is provided for high-precision and high-efficiency discharge control, the structure is compact, the operation is safer and more reliable, and the high-efficiency control of the diesel engine tail gas is also favorably realized.
The above embodiments have been merely illustrative of the basic principles and features of the present invention, and the present invention is not limited by the above embodiments, and does not depart from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The utility model provides a diesel engine tail gas aftertreatment solvent supply module, its characterized in that includes solvent case, diaphragm pump assembly, switching-over valve assembly, high-pressure filtration attenuator assembly and sprayer, diaphragm pump assembly with switching-over valve assembly fluid intercommunication makes the solvent pass through the diaphragm pump assembly pressure boost after getting into the switching-over valve assembly, be provided with two-way inlet and two-way liquid outlet on the switching-over valve assembly, the solvent case communicates to through the feed pipe way two-way inlet, two-way liquid outlet communicates to through the connecting line high-pressure filtration attenuator assembly, high-pressure filtration attenuator assembly pass through high-pressure output pipeline with the sprayer communicates.
2. The diesel exhaust aftertreatment solvent supply module of claim 1, wherein: the diaphragm pump assembly comprises a driving motor and a diaphragm pump, the driving motor drives a diaphragm in the diaphragm pump to swing back and forth to realize solvent suction and pumping, a liquid inlet cavity of the diaphragm pump is adjacent to a low-pressure attenuation cavity, the two cavities are communicated through an attenuation cavity metering hole, a pump liquid inlet is formed in the low-pressure attenuation cavity, and a liquid outlet of the diaphragm pump is formed in a liquid outlet cavity of the diaphragm pump.
3. The diesel exhaust aftertreatment solvent supply module of claim 2, wherein: the low-pressure attenuation cavity is also adjacent to the low-pressure resonant cavity, the two cavities are separated by the broadband attenuation diaphragm, and the low-pressure resonant cavity is provided with a resonance metering hole.
4. The diesel exhaust aftertreatment solvent supply module of claim 2, wherein: the reversing valve assembly comprises a first reversing valve cavity and a second reversing valve cavity, the bidirectional liquid inlet is arranged on the first reversing valve cavity, a first channel and a second channel are led out of the first reversing valve cavity, the bidirectional liquid outlet is arranged on the second reversing valve cavity, a third channel and a fourth channel are led out of the second reversing valve cavity, the second channel and the third channel are converged and communicated with the liquid inlet of the pump, the first channel and the fourth channel are converged and communicated with the liquid outlet of the pump, reversing valve plates are arranged in the first reversing valve cavity and the second reversing valve cavity respectively, and the two reversing valve plates are linked through an electromagnetic valve to achieve the purpose that the first channel and the third channel are closed simultaneously or the second channel and the fourth channel are closed simultaneously.
5. The diesel exhaust aftertreatment solvent supply module of claim 1, wherein: the high-pressure filter attenuator assembly comprises a high-pressure filter and a high-pressure attenuator, the inner cavity of the high-pressure filter is communicated with the high-pressure attenuator, the high-pressure attenuator is connected with a voltage stabilizing cavity, the high-pressure output pipeline is connected out of the voltage stabilizing cavity, a backflow metering hole is formed in the voltage stabilizing cavity, and the backflow metering hole is connected to the solvent tank through a backflow pipeline.
6. The diesel exhaust aftertreatment solvent supply module of claim 5, wherein: the high-voltage attenuator still leans on the cushion chamber, be provided with the air vent on the cushion chamber.
7. The diesel exhaust aftertreatment solvent supply module of claim 5, wherein: the high-pressure attenuator is of a hollow cylindrical structure, is embedded in the high-pressure filter and is used for filtering and stabilizing pressure fluctuation of a solvent at the downstream of the high-pressure filter.
8. The diesel exhaust aftertreatment solvent supply module of claim 1, wherein: and a filter is arranged at the port of the liquid supply pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220827372.1U CN217440138U (en) | 2022-04-11 | 2022-04-11 | Diesel engine tail gas aftertreatment solvent supply module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220827372.1U CN217440138U (en) | 2022-04-11 | 2022-04-11 | Diesel engine tail gas aftertreatment solvent supply module |
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| Publication Number | Publication Date |
|---|---|
| CN217440138U true CN217440138U (en) | 2022-09-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220827372.1U Active CN217440138U (en) | 2022-04-11 | 2022-04-11 | Diesel engine tail gas aftertreatment solvent supply module |
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| Country | Link |
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| CN (1) | CN217440138U (en) |
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- 2022-04-11 CN CN202220827372.1U patent/CN217440138U/en active Active
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