CN111608772A - Urea conveying pumpback pump core, device and SCR system - Google Patents

Urea conveying pumpback pump core, device and SCR system Download PDF

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Publication number
CN111608772A
CN111608772A CN201910139172.XA CN201910139172A CN111608772A CN 111608772 A CN111608772 A CN 111608772A CN 201910139172 A CN201910139172 A CN 201910139172A CN 111608772 A CN111608772 A CN 111608772A
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China
Prior art keywords
urea
pumpback
conveying
pumping
line
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CN201910139172.XA
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CN111608772B (en
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杜玮
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Xi'an Qintai Automobile Emission Technology Co ltd
Weichai Power Emission Solutions Technology Co Ltd
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Individual
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1433—Pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1486—Means to prevent the substance from freezing
    • 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
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)

Abstract

According to the urea conveying pumpback, the conveying line and the pumpback are integrated on one component through the integrated cavity seat, and the conveying pump and the pumpback are arranged opposite or at the same side, so that the installation space can be effectively saved, the manufacturing and the assembly are facilitated, and the production cost is reduced. In addition, the conveying pump driving part or/and the pumpbump driving part are/is driven by the electromagnet, the heating function can be completed by the conveying pump driving part or/and the pumpbump driving part by utilizing the characteristic that the electromagnet generates heat after being electrified, and a heating device is not arranged independently at the position, so that the volume of the device is reduced, and the overall cost of the urea conveying metering injection device and the urea conveying metering injection system is greatly reduced.

Description

Urea conveying pumpback pump core, device and SCR system
Technical Field
The invention belongs to the field of diesel engine tail gas aftertreatment, and relates to a conveying pumpback, a conveying pumpback device and an SCR system, in particular to a urea conveying pumpback, a urea conveying pumpback device and an SCR system which integrate a conveying pump pumpback into a whole.
Background
The Selective Catalytic Reduction (SCR) system of the diesel engine is made up of aqueous urea solution storage tank, aqueous urea solution transport/pumpback device, proportioning module and urea solution connecting line among them, and the Catalytic muffler set up on the exhaust emission pipeline of diesel engine, wherein the aqueous urea solution transports/pumpback device and urea solution pumpback line including aqueous urea solution transport line and aqueous urea solution, the transport line includes the liquid inlet pipeline, delivery pump, prefilter, postposition filter of energy storage, drain line, the pumpback line includes pumping line, pumpback, liquid return line; the conveying pump conveys the urea aqueous solution to the proportioning module from the storage tank through a conveying line, and the proportioning module sprays the urea aqueous solution to a tail gas discharge pipeline in front of the catalytic muffler, so that the urea aqueous solution is vaporized under the action of high-temperature tail gas discharged by the diesel engine to generate ammonia gas, then the ammonia gas enters the SCR catalyst to perform oxidation-reduction reaction with nitrogen oxide in the discharged tail gas, and finally nitrogen and water are generated, thereby achieving the purpose of reducing the emission of nitrogen oxide of the diesel engine; when the diesel engine is stopped, in order to prevent the urea aqueous solution remained between the delivery pump and the proportioning module from freezing at low temperature and freezing and cracking equipment and pipelines, the back-pumping pump pumps the urea aqueous solution back to the urea aqueous solution storage tank through a back-pumping line.
The structure of the existing non-air-assisted urea aqueous solution conveying/pumping device is as follows: the conveying pump and the back-pumping pump are separately arranged, the conveying line and the back-pumping line are also separately arranged, the layout structure is complex, the space is wasted, the manufacturing and the assembly are not facilitated, and meanwhile, a heating device is required to be separately arranged for preventing the urea aqueous solution in the parts such as a liquid inlet pipeline, the conveying pump, a liquid outlet pipeline, a liquid pumping pipeline in the back-pumping line, a filter cavity and the like in the conveying line from freezing under the low-temperature environment, so that the cost and the expense of the urea conveying metering injection device are greatly increased; in addition, the above layout of the non-air-assisted urea aqueous solution delivery/withdrawal device requires a check valve in the delivery pump and the withdrawal pump, but the problem of urea aqueous solution leakage often occurs due to the check valve.
Disclosure of Invention
In order to solve the above problems, the present invention provides a urea delivery and back-pumping pump core which has small volume, saves space and prevents the leakage of urea aqueous solution in the device, and mainly comprises a delivery pump driving part, an integrated cavity seat and a back-pumping pump driving part; the integrated cavity seat body is provided with a urea conveying line with a function of preventing the back pumping of urea aqueous solution from flowing and a urea back pumping line with a function of preventing the back pumping of urea aqueous solution from flowing, the urea conveying line comprises a liquid inlet pipeline, a liquid outlet pipeline and a conveying pump conveying part arranged between the liquid inlet pipeline and the liquid outlet pipeline, and the urea back pumping line comprises a liquid pumping pipeline, a liquid returning pipeline and a back pumping pump back pumping part arranged between the liquid pumping pipeline and the liquid returning pipeline; and the conveying pump driving part and the pumpback driving part are respectively fixed at corresponding positions of the conveying pump conveying part and the pumpback part on the integrated cavity seat body in a screw connection mode.
Preferably, urea delivery pump driver part is the electro-magnet drive, prevent to withdraw urea aqueous solution circulation function's urea transfer line for establish with the corresponding delivery pump transfer unit's of electro-magnet delivery pump driver part urea transfer line, or/and it is the electro-magnet drive to withdraw pump driver part, prevent to carry urea aqueous solution circulation function's urea withdrawal line for establish with the corresponding withdrawal pump withdrawal unit's of electro-magnet withdrawal pump driver part urea withdrawal line.
Preferably, urea delivery pump driver part is motor drive, prevent to withdraw urea aqueous solution circulation function's urea transfer line for establishing a one-way check valve, or/and withdrawal pump driver part is motor drive, prevent to carry urea aqueous solution circulation function's urea withdrawal line for establishing a one-way check valve.
The urea conveying pumpback is characterized in that the liquid inlet pipeline and the liquid return pipeline are respectively and independently designed, and the liquid outlet pipeline and the liquid pumping pipeline are respectively and independently designed. Or, further, the liquid inlet pipeline and the liquid return pipeline are designed into one pipeline; or/and the liquid outlet pipeline and the liquid pumping pipeline are designed into one pipeline. Or, further, the liquid inlet pipeline and the liquid return pipeline are respectively designed independently, and the pipeline interfaces of the liquid inlet pipeline and the liquid return pipeline are designed into one; or/and the liquid outlet pipeline and the liquid pumping pipeline are respectively and independently designed, and the pipeline interfaces of the liquid outlet pipeline and the liquid pumping pipeline are designed into one. Or, further, the conveying part of the conveying pump mainly comprises a conveying cavity, a conveying plate valve, a conveying valve core and a conveying membrane which are sequentially arranged in the conveying cavity; the pumping-back part of the pumping-back pump mainly comprises a pumping-back cavity, and a pumping-back plate valve, a pumping-back valve core and a pumping-back membrane which are sequentially arranged in the pumping-back cavity.
The other urea conveying pumpback mainly comprises a conveying pump driving part, an integrated cavity seat and a pumpback driving part; the integrated cavity base is provided with a urea conveying line with a function of preventing the urea aqueous solution from being pumped back and a urea pumping back line with a function of preventing the urea aqueous solution from being conveyed back, the urea conveying line comprises a liquid inlet pipeline, a liquid outlet pipeline and a conveying pump conveying part arranged between the liquid inlet pipeline and the liquid outlet pipeline, and the urea pumping back line comprises a liquid pumping pipeline, a liquid returning pipeline and a pumping back part arranged between the liquid pumping pipeline and the liquid returning pipeline; the conveying pump driving part and the pumpback driving part are respectively fixed at corresponding positions of the conveying pump conveying part and the pumpback part on the integrated cavity seat in a screw connection mode; the delivery pump drive unit is motor drive, prevent to withdraw urea aqueous solution circulation function's urea transfer line for being equipped with a one-way check valve, or/and the withdrawal pump drive unit is motor drive, prevent to carry urea aqueous solution circulation function's urea withdrawal line for being equipped with a one-way check valve.
Preferably, the one-way check valve of the urea conveying line is arranged in a liquid outlet pipeline at the communication position of the conveying part of the conveying pump and the liquid outlet pipeline. Or, preferably, the one-way check valve of the urea pumpback line is arranged in a liquid return pipeline at the communication position of the pumpback component and the liquid return pipeline.
In the preferable urea delivery pumpback, the one-way check valve comprises a spring, an inverted T-shaped spring seat and a tubular vertical column body arranged below the liquid outlet side switch function wafer on the delivery plate valve; the bottom of the inverted T-shaped spring seat is a cylinder embedded into a liquid outlet pipeline, a conical stand column is arranged at the center of the upper side face of the cylinder, at least two through holes for circulating urea aqueous solution are formed in the axial direction of the cylinder on the periphery of the root of the conical stand column, the upper end and the lower end of the spring are sleeved outside the tubular stand column body and the conical stand column respectively, and the top end of the conical stand column is inserted into the tubular stand column body.
The invention also provides a urea conveying and metering injection device which comprises the urea conveying and back-pumping pump core.
The invention also provides an SCR system which is characterized by comprising the urea conveying pumpback.
Compared with the prior art, the urea conveying pumpback provided by the invention integrates the urea conveying pumpback and has the following beneficial effects:
1. the conveying line and the pumping-back line are integrated on one component through the integrated cavity seat, and the conveying pump and the pumping-back pump are arranged on the opposite sides or the same sides of the integrated cavity seat, so that the mounting space can be effectively saved, the manufacturing and the assembly are facilitated, and the production cost is reduced.
2. The conveying pump driving part or/and the pumpback driving part are/is driven by the electromagnet, the heating function can be completed by the electromagnet by utilizing the heating characteristic after the electromagnet is electrified, and a heating device is not arranged independently at the position, so that the volume of the device is reduced, and the overall cost of the urea conveying metering injection device is greatly reduced.
3. The one-way check valve is arranged on the conveying line or/and the back-pumping line (when the conveying pump driving part or/and the back-pumping pump driving part is driven by the electromagnet, the one-way check valve is not arranged on the corresponding line), so that the internal circulation phenomenon caused by the formation of a closed loop inside the integrated cavity seat in the working process of the back-pumping pump or/and the conveying pump is avoided. Meanwhile, the spring type stop valve is additionally arranged at the position of the output side hole on the upper side of the integrated cavity seat body, so that the structure is simpler, the processing and the assembly are easier, and the cost of the whole urea conveying and metering injection device and the system thereof is saved.
4. The invention separately arranges the inlet and outlet liquid of the conveying part and the back pumping part of the back pumping pump in the prior art with the one-way check valve structure, and respectively adopts the conveying plate valve and the back pumping plate valve structure, thereby greatly reducing the faults of solution leakage and the like caused by the failure of the one-way check valve and improving the reliability of the urea conveying metering injection system and the system thereof.
5. The liquid inlet pipeline and the liquid return pipeline are designed and arranged independently, so that direct impact of liquid on the conveying plate valve in the pumping-back process can be effectively reduced, the load of a one-way check valve spring in the liquid outlet pipeline is reduced, the design force value of the spring is reduced, the spring resistance required to be overcome in the conveying process is reduced, and the conveying capacity of the conveying pump is improved. Similarly, the liquid outlet pipeline and the liquid pumping pipeline are arranged in a single design mode, so that the direct impact of liquid on the back-pumping plate valve in the conveying process can be effectively reduced, the load of a one-way check valve spring in the liquid return pipeline is reduced, the design force value of the spring is reduced, the spring resistance which needs to be overcome in the back-pumping process is reduced, and the back-pumping capacity of the back-pumping pump is improved.
Drawings
FIG. 1 is a schematic view of an assembly of a urea delivery pumpback of the first embodiment.
FIG. 2 is a schematic view of a partial longitudinal cross-section of a urea delivery pumpback according to the first embodiment.
Fig. 3 is a top view of the transfer membrane of fig. 2.
Fig. 4 is a bottom view of the transfer membrane of fig. 2.
Fig. 5 is a schematic longitudinal sectional structure view of a-a in fig. 3.
Fig. 6 is a top view of the transfer plate valve of fig. 2.
Fig. 7 is a bottom view of the transfer plate valve of fig. 2.
Fig. 8 is a schematic longitudinal sectional structure view of a-a in fig. 6.
Fig. 9 is a top view of the delivery cartridge of fig. 2.
Fig. 10 is a bottom view of the delivery cartridge of fig. 2.
Fig. 11 is a schematic longitudinal sectional view of a-a in fig. 9.
Fig. 12 is a top view of the withdrawal spool of fig. 2.
Fig. 13 is a bottom view of the withdrawal spool of fig. 2.
Fig. 14 is a schematic longitudinal sectional view of a-a in fig. 12.
Fig. 15 is a top view of the take-out plate valve of fig. 2.
Fig. 16 is a schematic longitudinal sectional view of a-a in fig. 15.
Fig. 17 is a top view of the retracting diaphragm of fig. 2.
Fig. 18 is a bottom view of the retracting diaphragm of fig. 2.
Fig. 19 is a schematic longitudinal sectional view of a-a in fig. 17.
Fig. 20 is an enlarged schematic structural view of a longitudinal section of a conveying part of the conveying pump of the integrated cavity seat body in fig. 2.
Fig. 21 is an enlarged structural view of a longitudinal section of a part of the back-pumping component of the integrated cavity seat body back-pumping pump in fig. 2.
FIG. 22 is a schematic view of a partial longitudinal cross-sectional structure of a urea delivery pumpback of the second embodiment.
FIG. 23 is a partial longitudinal sectional view of the urea delivery pumpback of the third embodiment.
FIG. 24 is a partial longitudinal sectional view of the urea delivery pumpback of the fourth embodiment.
Detailed Description
The urea delivery and back-pumping core integrated with the delivery pump back-pumping pump provided by the invention is described in detail below with reference to the accompanying drawings and specific embodiments.
Example one
As shown in fig. 1, which is an assembly schematic diagram of the urea delivery and back-pumping pump core of this embodiment, the urea delivery and back-pumping pump core is composed of a delivery pump driving component 100, an integrated cavity seat 200, and a back-pumping pump driving component 300, wherein the delivery pump driving component 100 and the back-pumping pump driving component 300 are respectively fixed on the upper and lower side surfaces of the integrated cavity seat 200 in a screw connection manner.
FIG. 2 is a schematic diagram of a partial longitudinal section of the urea delivery pumpback of the present embodiment; the conveying pump driving part 100 comprises a driving motor 101, a transmission bracket 102 which is connected with a stator of the driving motor 101 and is provided with a base 105, a transmission shaft 104 which is connected with a rotor of the driving motor 101, and a conversion element 103 which converts axial rotation motion into vertical motion, wherein the transmission shaft 104 is fixed on the transmission bracket 102 through a bearing, the conversion element 103 is fixed on the transmission shaft 104 in the transmission bracket 102 in an interference mode, and the conversion element 103 is connected with a conveying membrane 201 vulcanized with a metal cylinder with threads at the top at the hollow center of the base 105.
The integrated cavity base 200 comprises an integrated cavity base body 206, and a liquid inlet pipeline 212, a liquid return pipeline 213, a liquid outlet pipeline 214, a liquid pumping pipeline 216, a conveying pump conveying component and a back-pumping pump back-pumping component thereof.
The back-pumping pump driving component 300 comprises an electromagnet coil 307, a fixing frame 306 of the electromagnet coil, a shaft sleeve 305, a shell end cover 304, a back-pumping diaphragm pressing plate 303, a fixed iron core (not shown), a movable iron core 301, a return spring 302 of the movable iron core 301, and a metal cylinder vulcanized at the bottom of a back-pumping diaphragm 209, wherein the movable iron core 301 is in threaded connection with the metal cylinder, the back-pumping diaphragm pressing plate 303 is used for clamping the back-pumping diaphragm 209 in the integrated cavity seat, and the back-pumping pump driving component 300 is fixed at the lower side of the integrated cavity seat body 206 through a screw 308 on a shell base 310.
The liquid inlet pipeline 212 is a flow pipeline for feeding urea aqueous solution to the delivery pump, and a liquid inlet pipeline joint 211 of the liquid inlet pipeline is connected with a liquid outlet (not shown) of a pre-filter cavity in the system (the liquid inlet pipeline joint and the liquid outlet are sealed by O-shaped sealing rings (not shown));
the liquid return pipeline 213 is a circulation pipeline for flowing out urea aqueous solution from the pumpback pump, and is combined into a whole at the liquid inlet pipeline joint 211; (the respective lines can be connected individually)
The liquid outlet pipeline 214 is a flow pipeline for urea aqueous solution flowing out of the delivery pump, and the liquid outlet pipeline is connected with a liquid inlet (not shown) of an energy storage post-filter cavity in the system, wherein the liquid outlet pipeline is externally connected with the liquid inlet (not shown) of the energy storage post-filter cavity (the liquid inlet and the liquid outlet pipeline are sealed by O-shaped sealing rings (not shown));
the liquid pumping pipeline 216 is a circulation pipeline for flowing urea aqueous solution into the back-pumping pump, and is combined into a whole at the position of the liquid outlet pipeline joint 215; (the respective lines can be connected individually)
As shown in fig. 2 and fig. 20, the conveying pump conveying component comprises a conveying cavity, and a conveying plate valve 203, a conveying valve core 202 and a conveying membrane 201 which are sequentially arranged in the conveying cavity; the conveying cavity is arranged on the upper side surface of the integrated cavity seat body 206 and is a circular groove, two independent square bosses are arranged at the bottom of the conveying cavity, round holes communicated with the liquid inlet pipeline 212 and the liquid outlet pipeline 214 are respectively formed in the centers of the two independent square bosses, an annular groove is formed around the round hole communicated with the liquid inlet pipeline 212, and a circular groove is formed in the side of the square boss of the round hole communicated with the liquid outlet pipeline 214.
Referring to fig. 3-5, which are schematic structural diagrams of the delivery diaphragm 201 in fig. 2 and 20, the delivery diaphragm 201 is a cap-shaped rubber diaphragm, a cylindrical metal insert screwed with the conversion element 103 is vulcanized on the top of the cap-shaped rubber diaphragm, and the cap-shaped rubber diaphragm is fixed on the upper side of the delivery cavity of the integrated cavity base body by the screw 106 through the bottom plate 105 of the transmission bracket 102 of the delivery pump driving part 100.
As shown in fig. 6-8, which are schematic structural diagrams of the conveying plate valve 203 in fig. 2 and 20, the conveying plate valve 203 is a rectangular rubber plate, the upper and lower peripheries of the conveying plate valve 203 and the upper and lower sides of the center line of the two long sides are designed as convex edges, the two sides of the center line of the two long sides are respectively designed as a circular plate with a switch function, which is connected with the periphery and suspended in the center, and is respectively opposite to the pipe openings of the liquid inlet pipe 212 and the liquid outlet pipe 214 of the integrated cavity base body 206, and a tubular upright column integrated with the circular plate is arranged at the center of the bottom of the circular plate with the switch function, which is arranged at the side of.
As shown in fig. 9-11, which are schematic structural diagrams of the feeding valve core 202 in fig. 2 and 20, the feeding valve core 202 is a cylindrical body, the upper and lower sides of the feeding valve core 202 are respectively designed with a circular groove corresponding to the outer edge of the feeding membrane 201 and a square groove corresponding to the upper convex edge of the feeding plate valve 203, and the feeding valve core 202 is axially provided with a small through hole and a large through hole corresponding to two wafers with switching functions on and off the feeding plate valve 203; the bottom of the square groove is provided with two independent square bosses, wherein the boss at the liquid inlet side is provided with a round groove which is similar to the round groove and the outer edge of which is larger than the round plate, and a round hole which corresponds to the round plate with the opening and closing function at the liquid inlet side on the conveying plate valve is staggered in the round groove; the liquid outlet side boss is provided with a groove with an outer edge larger than the wafer, a round hole corresponding to the wafer with the switching function at the liquid outlet side on the conveying plate valve is arranged in the groove, a convex edge is arranged around the round hole, and the top of the convex edge is flush with the top of the groove.
The working principle of the delivery pump is as follows: after the urea metering injection system receives an injection instruction, the driving motor 101 starts to drive the transmission shaft 104 to rotate, and the conversion element 103 drives the conveying membrane 201 to reciprocate up and down; when the conveying membrane 201 is driven to move upwards, a negative pressure space is formed among the conveying membrane 201, the conveying valve core 202 and the wafers on the two sides of the conveying plate valve 203, so that the wafers with two switching functions of the conveying plate valve 203 move upwards to cause the liquid inlet side pipeline to be opened and the liquid outlet side pipeline to be closed, and liquid in the liquid inlet side pipeline finally enters the space among the conveying membrane 201, the conveying valve core 202 and the wafers on the liquid outlet side of the conveying plate valve 203 from the liquid inlet pipe orifice through the liquid inlet pipeline 212 and the periphery of the liquid inlet side switching wafer under the action of negative pressure; when the conveying membrane 201 is driven to move downwards, a positive pressure space is formed among the conveying membrane 201, the conveying valve core 202 and the wafers on the two sides of the conveying plate valve 203, so that the wafers with two switching functions of the conveying plate valve 203 move downwards to cause the liquid inlet side pipeline to be closed and the liquid outlet side pipeline to be opened, and thus, the liquid previously stored in the space among the conveying membrane 201, the conveying valve core 202 and the liquid outlet side wafer of the conveying plate valve 203 flows out from the periphery of the liquid outlet side switching wafer and reaches the pipe orifice 215 of the liquid outlet pipeline through the liquid outlet pipeline 214; completing a reciprocating cycle.
As shown in fig. 2 and 21, the pumpback component comprises a pumpback chamber, and a pumpback valve 207, a pumpback core 208 and a pumpback membrane 209 which are sequentially arranged in the pumpback chamber; the pumping-back cavity is arranged on the lower side surface of the integrated cavity seat body 206 and is a circular groove, two independent square bosses are arranged at the bottom of the pumping-back cavity, round holes communicated with the liquid pumping pipeline 216 and the liquid return pipeline 213 are respectively arranged in the middle of the pumping-back cavity, an annular groove is arranged around the round hole of the liquid pumping pipeline 216, and a circular groove with a boss at the center is arranged on the side of the square boss communicated with the liquid return pipeline 213.
As shown in fig. 17-19, which are schematic structural diagrams of the pumping diaphragm 209 in fig. 2 and fig. 21, the pumping diaphragm 209 is a circular rubber diaphragm with an outer edge, a circular boss (when liquid is not pumped back, the circular boss seals the circular hole at the lower side of the pumping valve core) is arranged at the center of the top of the pumping diaphragm 209 corresponding to the circular hole at the lower side of the pumping valve core, a cylindrical metal insert in threaded connection with the movable iron core is vulcanized at the bottom of the pumping diaphragm, and the pumping diaphragm 209 is fixed in the pumping cavity of the integrated cavity base body 206 sequentially through the chassis 303 and the housing base 310 of the pumping pump driving part by using a screw 308.
As shown in fig. 12 to 14, which are schematic structural views of the withdrawing valve core 208 in fig. 2 and 21, the withdrawing valve core 208 is a cylinder, and the upper and lower sides of the withdrawing valve core 208 are respectively designed with a square groove corresponding to the convex edge of the withdrawing plate valve 207 and a circular groove corresponding to the outer edge of the withdrawing membrane 209; a through hole corresponding to the wafer with the switching function on the liquid return side of the drawing plate valve 207 is axially arranged, and a special-shaped through hole (two circular holes which are vertically staggered and run through) corresponding to the wafer with the switching function on the liquid suction side of the drawing plate valve 207 is arranged in the center of the through hole; the bottom of the square groove on the upper side face of the liquid sucking side boss is provided with two independent square bosses, the groove with the outer edge larger than the wafer is arranged on the liquid sucking side boss, a round hole corresponding to the wafer with the liquid sucking side having the switching function on the back-suction plate valve is formed in the groove in a staggered mode, a round hole corresponding to the wafer with the liquid sucking side having the switching function on the back-suction plate valve is formed in the liquid returning side boss, and a convex edge is arranged on the periphery of the round hole.
As shown in fig. 15-16, which are schematic structural diagrams of the drawing plate valve 207 in fig. 2 and 21, the drawing plate valve 207 is a rectangular rubber plate, the upper and lower peripheries of the drawing plate valve 207 and the upper and lower sides of the center lines of the two long sides are both designed as convex edges, and the two side areas of the center lines of the two long sides are respectively designed as a circular plate with a central suspended function connected with the peripheral parts, and the circular plate is respectively opposite to the nozzle of the liquid pumping pipeline 216 of the integrated cavity base body 206 and staggered from the nozzle of the liquid return pipeline 213.
The working principle of the pumpbump is as follows: when the urea metering injection system receives a pumping-back instruction, when the electromagnet coil 307 is electrified to generate electromagnetic attraction, the movable iron core 301 overcomes the elastic force of the reset spring 302 to drive the pumping-back membrane 209 to move downwards; when the electromagnet coil 307 is powered off, the electromagnetic attraction disappears, the movable iron core 301 moves upwards under the action of the elastic force of the reset spring 302, and the power-on and power-off are repeated in such a way, so that the pumping-back membrane 209 reciprocates up and down; when the pumping-back membrane 209 moves downwards, a negative pressure space is formed among the pumping-back membrane 209, the pumping-back valve core 208 and the wafers on the two sides of the pumping-back plate valve 207, so that the wafers with two switching functions of the pumping-back plate valve move downwards to cause the opening of the liquid pumping side pipeline and the closing of the liquid pumping side pipeline, and thus, residual liquid in the liquid pumping side pipeline finally enters the space among the pumping-back membrane 209, the pumping-back valve core 208 and the liquid pumping-back side wafer of the pumping-back plate valve 207 from the liquid pumping pipe orifice through the liquid pumping pipeline and the periphery of the liquid pumping side switching wafer under the action of negative pressure; when the pumping-back membrane 209 moves upwards, a positive pressure space is formed among the pumping-back membrane 209, the pumping-back valve core 208 and the wafers on the two sides of the pumping-back plate valve 207, so that the wafers with two switching functions of the pumping-back plate valve move upwards to open the liquid-returning side pipeline and close the liquid-pumping side pipeline, and thus, the liquid previously stored in the space among the pumping-back membrane 209, the pumping-back valve core 208 and the liquid-returning side wafer of the pumping-back plate valve 207 flows out from the periphery of the liquid-returning side switching wafer and reaches the pipe orifice 211 of the liquid-returning pipeline through the liquid-returning pipeline 213; completing a reciprocating cycle.
In order to prevent the urea delivery and back-pumping pump core integrated with the delivery pump and back-pumping pump from forming a self-circulation phenomenon (when the back-pumping diaphragm moves downwards, the negative pressure generated at the back-pumping side makes the round piece with a switch function at the liquid outlet side of the delivery plate valve move downwards so as to make the round piece with the switch function at the liquid inlet side of the delivery plate valve move upwards, and when the back-pumping diaphragm moves upwards, the positive pressure generated at the liquid return side makes the round piece with the switch function at the liquid inlet side of the delivery plate valve move upwards so as to make the round piece with the switch function at the liquid outlet side of the delivery plate valve move downwards, so that the delivery line and the back-pumping line are unblocked to form a closed loop, and the internal circulation phenomenon is caused to make back-pumping ineffective, a one-way check valve is arranged at the round hole communicated with the liquid outlet line 214 in the square boss at the bottom of the delivery cavity of the integrated cavity base body, comprises a spring, an inverted T-shaped spring seat and a tubular vertical column body arranged below a liquid outlet side switch function wafer on a conveying plate valve; the bottom of the inverted T-shaped spring seat is a cylinder embedded into the liquid outlet pipeline, a conical upright column is arranged at the center of the upper side face of the cylinder, at least two through holes for circulating urea aqueous solution are formed in the axial direction of the cylinder at the periphery of the root of the conical upright column, the inverted T-shaped spring seat is pressed into a circular hole communicated with the liquid outlet pipeline 214 in an interference manner, the upper end and the lower end of the spring are sleeved outside the tubular upright column and the conical upright column respectively, and the top end of the conical upright column is inserted into the tubular upright column. Therefore, the round hole corresponding to the lower side of the conveying valve core and the liquid outlet side of the round piece with the switching function on the liquid outlet side on the conveying plate valve is sealed and closed under the spring force action of the one-way valve, and thus the round piece with the switching function on the liquid outlet side of the conveying plate valve cannot move due to positive pressure and negative pressure generated by the pumping-back membrane during up-and-down movement, so that the self-circulation phenomenon is avoided.
Of course, because the above-mentioned delivery pump pumpback collects urea delivery pumpback as an organic whole, when the delivery pump is worked, the self-circulation phenomenon can not be formed with the pumpback in the delivery circuit in the integrated cavity seat, and the reason is: the driving part of the pumpback is driven by an electromagnet, the center of the upper side surface of the pumpback membrane 209 in the pumpback driving part is designed into a boss, when the conveying pump works, the boss at the center of the upper side surface of the pumpback membrane 209 blocks up the special-shaped through hole of the pumpback valve core 208 under the action of the reset spring 302, and thus, the conveying line and the pumpback line in the integrated cavity seat can not form a self-circulation phenomenon when the conveying pump works.
The structure of the existing non-air-assisted urea aqueous solution delivery/pumpback pump is as follows: the conveying pump and the back-pumping pump are separately arranged, the conveying line and the back-pumping line are also separately arranged, the structural layout is complex, the space is wasted, the manufacturing and the assembly are not facilitated, and meanwhile, in order to prevent the urea aqueous solution in the parts such as the liquid inlet pipeline, the conveying pump, the liquid outlet pipeline and the liquid pumping pipeline in the conveying line from freezing under the low-temperature environment, an independent heating device is required to be arranged, and the space is wasted. The invention changes the pump core structure of the separate design of the delivery pump and the pumpback into the integrated pump core structure of the relative arrangement of the delivery pump and the pumpback, not only enables the urea delivery pump and the pumpback to be designed into a whole, but also enables the delivery line and the pumpback to be designed into a whole, the layout structure of the liquid inlet pipeline and the liquid return pipeline is simple, the manufacturing and the assembly are facilitated, the volume is small, the layout space is greatly saved, meanwhile, the pumpback adopts the electromagnet to drive and utilizes the self to have the heating function, heating devices do not need to be separately arranged at the liquid inlet pipeline and the delivery pump for preheating, and the manufacturing cost is saved. The invention has the following advantages:
1. the spatial position of the urea conveying and metering injection device arranged in the diesel engine tail gas aftertreatment system is extremely limited. The pump core structure integrates the conveying line and the pumping-back line on one component through the integrated cavity seat, and the conveying pump and the pumping-back pump are oppositely arranged, so that the space in the horizontal direction can be effectively saved, the manufacturing and the assembly are facilitated, and the production cost is reduced. If the pump core structure adopts the structure that the delivery pump and the pumpback are arranged at the same side of the integrated cavity seat body, the space in the installation height direction can be saved.
2. When the urea conveying and metering injection device works in a low-temperature environment, liquid can be frozen in the conveying line and the pumping-back line to block the pipeline. The pump core structure functional unit comprises the electromagnet, the heating function can be completed by the electromagnet by utilizing the heating characteristic after the electromagnet is electrified, and the heating device is prevented from being arranged independently at the position. In this way, the overall cost of the urea delivery metering injection device and its system is greatly reduced.
3. The pump core structure is provided with the spring type one-way check valve on the conveying line (the spring type one-way check valve is arranged only because the conveying pump driving part adopts the motor drive, and the spring type one-way check valve can be cancelled if the conveying pump driving part adopts the electromagnet drive), so that the internal circulation phenomenon caused by the formation of a closed loop inside the integrated cavity seat in the working process of the pumpback is avoided. Meanwhile, the one-way check valve is additionally arranged at the liquid outlet side hole on the upper side of the integrated cavity seat body, so that the structure is simpler, the processing and the assembly are easier, and the cost of the whole device and the system thereof is saved.
4. The structure of the liquid inlet and outlet one-way check valve for controlling the conveying part and the pumping part of the pumping back part of the conveying pump in the prior art is changed into the structure of the conveying plate valve in the embodiment, so that the faults of solution leakage and the like caused by the failure of the one-way check valve are greatly reduced, and the reliability of the urea conveying metering injection device and the system thereof is improved.
5. The adoption is arranged liquid inlet pipe way and liquid return pipe way independent design, not only can effectively reduce at the pumpback in-process, and the direct impact of liquid to the delivery plate valve alleviates spring load in the one-way check valve to reduce the spring design power value, reduced this spring resistance that need overcome at the transportation process moreover, and then promoted the transport capacity of delivery pump.
Example two
In order to further effectively reduce the volume of the urea delivery and back-pumping core integrated by the delivery pump and back-pumping pump in the first embodiment, the liquid outlet and back-pumping pipeline 214' is adopted in the first embodiment, and the rest is the same as that in the first embodiment, see fig. 22, which is a schematic view of a partial longitudinal sectional structure of the urea delivery and back-pumping core in the first embodiment.
EXAMPLE III
In order to further effectively reduce the volume of the urea conveying pumpback integrated with the conveying pump pumpback in the first embodiment, the first embodiment adopts the liquid inlet and liquid return pipeline 212' which combines the liquid inlet pipeline and the liquid return pipeline into one, and the rest is the same as that in the first embodiment, see fig. 23, which is a schematic view of a local longitudinal sectional structure of the urea conveying pumpback in the first embodiment.
Example four
In order to further effectively reduce the volume of the urea delivery/back-pumping pump core integrated by the delivery pump back-pumping pump in the first embodiment, the first embodiment adopts the liquid inlet back-pumping pipeline 212 'that combines the liquid inlet pipeline and the liquid return pipeline into one, and the second embodiment adopts the liquid outlet pipeline 214' that combines the liquid outlet pipeline and the liquid pumping pipeline into one, and the rest is the same as the first embodiment, see fig. 24, which is a schematic view of a local longitudinal section structure of the urea delivery back-pumping pump core in the first embodiment.
The urea conveying and back-pumping pump core integrates the conveying pump and the back-pumping pump, which is only exemplified by adopting a motor as a conveying pump driving part, adopting an electromagnet as a back-pumping pump driving part, integrating a check valve in a round hole communicated with a liquid outlet pipeline in a square boss at the bottom of a conveying cavity of a cavity seat body, and the like; or the urea conveying and back-pumping pump core is integrated with the conveying pump back-pumping pump, wherein the conveying pump driving part adopts an electromagnet, the back-pumping pump driving part adopts a motor, and the conveying pump back-pumping pump formed by a one-way check valve in a round hole communicated with a liquid return pipeline in a square boss at the bottom of the back-pumping cavity of the integrated cavity seat body; the urea conveying and back-pumping device also can be a urea conveying and back-pumping core integrated by a conveying pump driving part adopting an electromagnet and a back-pumping pump driving part adopting a conveying pump back-pumping pump formed by an electromagnet, but only the conveying pump, the back-pumping pump and an integrated cavity seat are designed into a whole, and the design of a urea conveying line has the function of preventing back-pumping urea aqueous solution from flowing (a check valve can be arranged on the line of the urea conveying pump back-pumping core, and an electromagnet pump back-pumping membrane can also be adopted) and the design of a urea back-pumping line has the function of preventing conveying urea aqueous solution from flowing (a check valve can be arranged on the line of the urea conveying pump back-pumping core, and the design ideas of all similar devices belong to the protection scope; therefore, the present invention is not limited to the above-described embodiments, and various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed; the scope of the invention is defined by the appended claims and equivalents thereof.
The invention also provides a urea conveying and metering injection device which comprises the urea conveying and back-pumping pump core.
The invention also provides an SCR system which is characterized by comprising the urea conveying pumpback.

Claims (13)

1. A urea conveying pumpback is characterized by mainly comprising a conveying pump driving part (100), an integrated cavity seat (200) and a pumpback driving part (300); the integrated cavity base (200) is provided with a urea conveying line with a function of preventing the circulation of pumped urea aqueous solution and a urea pumping-back line with a function of preventing the circulation of the pumped urea aqueous solution, wherein the urea conveying line comprises a liquid inlet pipeline, a liquid outlet pipeline and a conveying pump conveying part arranged between the liquid inlet pipeline and the liquid outlet pipeline, and the urea pumping-back line comprises a liquid pumping pipeline, a liquid returning pipeline and a pumping-back pump pumping part arranged between the liquid pumping pipeline and the liquid returning pipeline; and the conveying pump driving part (100) and the pumpback driving part (300) are respectively fixed at the corresponding positions of the conveying pump conveying part and the pumpback part on the integrated cavity seat (200) body in a screw connection mode.
2. The urea delivery pumpback core according to claim 1, wherein the delivery pump driving component (100) is driven by an electromagnet, the urea delivery line with the function of preventing the circulation of the urea aqueous solution is the urea delivery line of the delivery pump delivery component corresponding to the electromagnet delivery pump driving component, or/and the pumpback driving component (300) is driven by an electromagnet, and the urea pumpback line with the function of preventing the circulation of the urea aqueous solution is the urea pumpback line of the pumpback component corresponding to the electromagnet pumpback driving component.
3. The urea pumping unit as claimed in claim 1, wherein the driving unit (100) is motor-driven, the urea delivery line for preventing the circulation of the urea aqueous solution is a urea delivery line having a one-way check valve, or/and the driving unit (300) is motor-driven, and the urea pumping line for preventing the circulation of the urea aqueous solution is a urea pumping line having a one-way check valve.
4. The urea feed pumpback of claims 1-3, wherein the liquid inlet line and the liquid return line are each designed separately, and the liquid outlet line and the liquid suction line are each designed separately.
5. The urea feed pumpback of claims 1-3, wherein the liquid inlet line and the liquid return line are designed as one line; or/and the liquid outlet pipeline and the liquid pumping pipeline are designed into one pipeline.
6. The urea feed pumpback of claims 1-3, wherein the liquid inlet line and the liquid return line are designed separately and have one line connection; or/and the liquid outlet pipeline and the liquid pumping pipeline are respectively and independently designed, and the pipeline interfaces of the liquid outlet pipeline and the liquid pumping pipeline are designed into one.
7. The urea conveying pumpback pump core as claimed in claims 1-2, characterized in that the conveying pump conveying component mainly comprises a conveying cavity, a conveying plate valve (203), a conveying valve core (202) and a conveying diaphragm (201) which are sequentially arranged in the conveying cavity; the pumpback component of the pumpback mainly comprises a pumpback cavity, and a pumpback valve (207), a pumpback valve core (208) and a pumpback membrane (209) which are sequentially arranged in the pumpback cavity.
8. The urea delivery pumpback pump core as claimed in claim 3, wherein the delivery pump delivery component mainly comprises a delivery cavity, a delivery plate valve (203), a delivery valve core (202) and a delivery diaphragm (201) which are sequentially arranged in the delivery cavity; the pumpback component of the pumpback mainly comprises a pumpback cavity, and a pumpback valve (207), a pumpback valve core (208) and a pumpback membrane (209) which are sequentially arranged in the pumpback cavity.
9. The urea delivery pumpback of claim 8, wherein the one-way check valve of the urea delivery line is disposed in the delivery line where the delivery pump delivery component communicates with the delivery line.
10. The urea delivery pumpback of claim 8, wherein the one-way check valve of the urea pumpback line is disposed in the liquid return line where the pumpback component communicates with the liquid return line.
11. The urea conveying pumpback pump core as claimed in claim 9 or 10, wherein the one-way check valve comprises a spring, an inverted T-shaped spring seat and a tubular upright column arranged below the liquid outlet side switch function wafer on the conveying plate valve; the bottom of the inverted T-shaped spring seat is a cylinder embedded into a liquid outlet pipeline, a conical stand column is arranged at the center of the upper side face of the cylinder, at least two through holes for circulating urea aqueous solution are formed in the axial direction of the cylinder on the periphery of the root of the conical stand column, the upper end and the lower end of the spring are sleeved outside the tubular stand column body and the conical stand column respectively, and the top end of the conical stand column is inserted into the tubular stand column body.
12. The urea conveying and metering injection device is characterized by comprising the urea conveying and back-pumping pump core.
13. An SCR system is characterized by comprising the urea conveying pumpback.
CN201910139172.XA 2019-02-25 2019-02-25 Urea conveying back-pumping pump core, device and SCR system Active CN111608772B (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006051120A1 (en) * 2006-10-25 2008-04-30 Biechele, Günter Pump-and-valve unit has housing of valve, fitted with valve seals, connected to pump housing
EP2342460A1 (en) * 2008-10-30 2011-07-13 Robert Bosch GmbH Membrane pump with a multi-part pump housing
DE102011075422A1 (en) * 2011-05-06 2012-11-08 Robert Bosch Gmbh Integral conveyor module for supplying urea-water solution to exhaust gas aftertreatment system of self-ignition diesel engine, has housing whose cover comprises connections, where pump, filter unit and throttle are combined in housing
CN104755757A (en) * 2012-10-22 2015-07-01 罗伯特·博世有限公司 Valve assembly for conveying device
CN107327400A (en) * 2017-08-09 2017-11-07 华中科技大学无锡研究院 A kind of suck-back device of urea pump
CN207750226U (en) * 2017-08-09 2018-08-21 华中科技大学无锡研究院 A kind of suck-back device of urea pump
CN210440102U (en) * 2019-02-25 2020-05-01 杜玮 Urea conveying pumpback pump core, device and SCR system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006051120A1 (en) * 2006-10-25 2008-04-30 Biechele, Günter Pump-and-valve unit has housing of valve, fitted with valve seals, connected to pump housing
EP2342460A1 (en) * 2008-10-30 2011-07-13 Robert Bosch GmbH Membrane pump with a multi-part pump housing
DE102011075422A1 (en) * 2011-05-06 2012-11-08 Robert Bosch Gmbh Integral conveyor module for supplying urea-water solution to exhaust gas aftertreatment system of self-ignition diesel engine, has housing whose cover comprises connections, where pump, filter unit and throttle are combined in housing
CN104755757A (en) * 2012-10-22 2015-07-01 罗伯特·博世有限公司 Valve assembly for conveying device
CN107327400A (en) * 2017-08-09 2017-11-07 华中科技大学无锡研究院 A kind of suck-back device of urea pump
CN207750226U (en) * 2017-08-09 2018-08-21 华中科技大学无锡研究院 A kind of suck-back device of urea pump
CN210440102U (en) * 2019-02-25 2020-05-01 杜玮 Urea conveying pumpback pump core, device and SCR system

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