Integrated apparatus, exhaust gas post-processing system, and control method

Abstract

An integrated apparatus of a pump and a nozzle, comprising a pump component and a nozzle component. The pump component comprises a motor housing assembly, a magnetic cover component and a pump housing assembly. The motor housing assembly comprises a magnetic screening cover and a motor coil. The motor housing assembly is fixed to the pump housing assembly by means of a method of rolling or welding. The pump housing assembly comprises an inlet pathway, which is in communication with a pump, and an outlet pathway, the outlet pathway being in communication with the nozzle component. The pump housing assembly also comprises a first gear assembly and a second gear assembly which are mutually engaged. The nozzle component comprises a nozzle assembly and a water cooling base, wherein the nozzle assembly comprises a nozzle coil for use in driving the nozzle. The integrated apparatus has a simple and compact structure, and high precision control. In addition, also provided is an exhaust gas post treatment system and a control method.

1 . An integrated apparatus of a pump and a nozzle, wherein the pump is used for pumping a fluid medium toward the nozzle, and the nozzle is used for injecting the fluid medium into intake gas or exhaust gas of an engine, characterized in that the integrated apparatus comprises a pump component and a nozzle component; the pump component comprises an electric machine casing assembly, a magnetic cover component at least partially located in the electric machine casing assembly, and a pump housing assembly cooperating with the electric machine casing assembly; the electric machine casing assembly comprises an electromagnetic shielding cover, and an electric machine coil at least partially located in the electromagnetic shielding cover; the magnetic cover component comprises a metal cover at least partially inserted into the electric machine coil, and a rotor received in the metal cover; the electric machine casing assembly and the pump housing assembly are fixed together by roll extrusion or welding; the pump housing assembly comprises an inlet passage located upstream of the pump and in communication with the pump, and an outlet passage located downstream of the pump and in communication with the pump, wherein the outlet passage is in communication with the nozzle component; the pump housing assembly further comprises a first gear component and a second gear component meshed with each other, wherein the first gear component comprises a first gear shaft and a first gear, the second gear component comprises a second gear shaft and a second gear, the first gear and the second gear being meshed with each other, and the rotor being fixed to the first gear shaft; the nozzle component comprises a nozzle assembly, and a water-cooled base connected in a surrounding manner at the outside of the nozzle assembly, wherein the nozzle assembly comprises a nozzle coil for driving the nozzle. 
     
     
         2 . The integrated apparatus as claimed in  claim 1 , wherein the pump is a urea pump, the nozzle is a urea nozzle, and the fluid medium is a urea solution. 
     
     
         3 . The integrated apparatus as claimed in  claim 1 , wherein the pump is a fuel pump, the nozzle is a fuel nozzle, and the fluid medium is a fuel. 
     
     
         4 . The integrated apparatus as claimed in  claim 2 , wherein the controller subjects the urea pump and the urea nozzle respectively to independent control; the electric machine casing assembly comprises a controller, the controller comprising a circuit board, with the electric machine coil and the nozzle coil both being connected to the circuit board. 
     
     
         5 . The integrated apparatus as claimed in  claim 2 , wherein the integrated apparatus comprises a sensor, in communication with the outlet passage in order to detect temperature and pressure, and an overflow element connected between the outlet passage and the inlet passage. 
     
     
         6 . The integrated apparatus as claimed in  claim 2 , wherein the first gear shaft is a driving shaft, the second gear shaft is a driven shaft, and the first gear shaft is higher than the second gear shaft. 
     
     
         7 . The integrated apparatus as claimed in  claim 2 , wherein a freeze-resistant body located above the rotor is further provided in the metal cover, the freeze-resistant body being compressible in order to absorb an expansion volume caused by the freezing of urea. 
     
     
         8 . The integrated apparatus as claimed in  claim 7 , wherein the pump component further comprises an elastic body received in the metal cover and located below the rotor, the elastic body being compressible in order to absorb an expansion volume caused by the freezing of urea. 
     
     
         9 . The integrated apparatus as claimed in  claim 2 , wherein the pump housing assembly is provided with a gear slot receiving the first gear and the second gear, the first gear and the second gear are meshed externally, one side of the gear slot is provided with a liquid entry cavity in communication with the inlet passage, and another side of the gear slot is provided with a liquid exit cavity in communication with the outlet passage. 
     
     
         10 . The integrated apparatus as claimed in  claim 9 , wherein the pump housing assembly is further provided with a first freeze-resistant rod located in the liquid entry cavity and a second freeze-resistant rod located in the liquid exit cavity; the first freeze-resistant rod and the second freeze-resistant rod are both compressible when urea freezes. 
     
     
         11 . The integrated apparatus as claimed in  claim 1 , wherein the nozzle assembly comprises a magnetic part interacting with the nozzle coil, a first sleeve at least partially receiving the magnetic part, a valve needle part located below the magnetic part, a second sleeve at least partially receiving the valve needle part, a spring acting between the magnetic part and the valve needle part, a valve seat cooperating with the valve needle part, and a rotational flow plate which is manufactured separately from the valve seat and is in close abutment with the valve seat; the rotational flow plate is provided with a number of rotational flow grooves. 
     
     
         12 . The integrated apparatus as claimed in  claim 11 , wherein the nozzle coil is located at the periphery of the magnetic part, the valve needle part is provided with a valve needle, the first sleeve and the second sleeve are fixed together to form a space around the periphery of the valve needle part, the valve needle is provided with a through-hole in communication with the space, the second sleeve is provided with a communication groove establishing communication between the space and the rotational flow grooves, and the valve seat is provided with an injection hole cooperating with the valve needle. 
     
     
         13 . The integrated apparatus as claimed in  claim 1 , wherein the electric machine casing assembly is provided with an injection-molded connection insertion member electrically connected to the circuit board, a number of electronic components are mounted on the circuit board, and the electric machine casing assembly further comprises a heat dissipating pad covering a surface of the electronic components. 
     
     
         14 . The integrated apparatus as claimed in  claim 9 , wherein the magnetic cover component comprises a sheet part located below the metal cover, the sheet part being fixed to the pump housing assembly by means of a number of screws. 
     
     
         15 . The integrated apparatus as claimed in  claim 14 , wherein the pump housing assembly comprises a first housing, the first housing comprising a first upper surface, a first lower surface and a first side, wherein the first upper surface is provided with a first annular groove, a first island surrounded by the first annular groove, and a first sealing ring received in the first annular groove, with the sheet part pressing down on the first sealing ring; the first island is provided with a first positioning hole running through the first lower surface, and a second positioning hole running through the first lower surface; the urea pump comprises a first shaft sleeve received in the first positioning hole, and a second shaft sleeve received in the second positioning hole, wherein the first gear shaft is inserted into the first shaft sleeve, and the second gear shaft is inserted into the second shaft sleeve. 
     
     
         16 . The integrated apparatus as claimed in  claim 15 , wherein the first lower surface is provided with a first load release groove establishing communication between the first positioning hole and the second positioning hole. 
     
     
         17 . The integrated apparatus as claimed in  claim 15 , wherein the first island further comprises a first flow-guiding groove running through the first upper surface and in communication with the second positioning hole, and a first outlet hole running through the first upper surface and in communication with the liquid exit cavity; the first upper surface is further provided with a sensor receiving hole, located at a side of the first island and used for receiving a sensor, and the integrated apparatus comprises the sensor for detecting temperature and pressure; the first housing is further provided with a second outlet hole in communication with the sensor receiving hole. 
     
     
         18 . The integrated apparatus as claimed in  claim 17 , wherein the first housing is provided with an overflow element receiving slot, and the integrated apparatus is provided with an overflow element mounted in the overflow element receiving slot; when a pressure of the outlet passage is higher than a set value, the overflow element opens in order to return a portion of the urea solution into the inlet passage. 
     
     
         19 . The integrated apparatus as claimed in  claim 15 , wherein the pump housing assembly comprises a second housing, located below the first housing and connected to the first housing; the second housing comprises a second upper surface and a second lower surface, with the gear slot running through the second upper surface and the second lower surface. 
     
     
         20 . The integrated apparatus as claimed in  claim 19 , wherein the pump housing assembly comprises a third housing, located below the second housing and connected to the second housing; the third housing comprises a body part, and a protruding part extending downward from the body part, wherein the body part is provided with a third upper surface, with the third upper surface being provided with a third annular groove and a third island surrounded by the third annular groove; the third island is provided with a third positioning hole and a fourth positioning hole running through the third upper surface, the third positioning hole and the fourth positioning hole extending into the protruding part; the urea pump comprises a third shaft sleeve received in the third positioning hole, and a fourth shaft sleeve received in the fourth positioning hole, wherein the first gear shaft is inserted into the third shaft sleeve, and the second gear shaft is inserted into the fourth shaft sleeve. 
     
     
         21 . The integrated apparatus as claimed in  claim 20 , wherein the third island is provided with a second flow-guiding groove and a third flow-guiding groove running through the third upper surface, wherein the second flow-guiding groove is in communication with the third positioning hole, and the third flow-guiding groove is in communication with the fourth positioning hole. 
     
     
         22 . The integrated apparatus as claimed in  claim 20 , wherein the nozzle assembly comprises a magnetic part interacting with the nozzle coil, a valve needle part located below the magnetic part, a spring acting between the magnetic part and the valve needle part, and a valve seat cooperating with the valve needle part. 
     
     
         23 . The integrated apparatus as claimed in  claim 22 , wherein the nozzle assembly further comprises a first sleeve at least partially receiving the magnetic part, and a second sleeve at least partially receiving the valve needle part; the spring is mounted in the magnetic part and the valve needle part; the valve needle part is provided with a tapered part, and a valve needle extending downward from the tapered part; the first sleeve and the second sleeve are fixed together to form a space around the periphery of the valve needle part, and the valve needle is provided with a through-hole in communication with the space. 
     
     
         24 . The integrated apparatus as claimed in  claim 23 , wherein the nozzle assembly further comprises a rotational flow plate, manufactured separately from the valve seat and in close abutment with the valve seat, the rotational flow plate being provided with a number of rotational flow grooves; the second sleeve is provided with a communication groove establishing communication between the space and the rotational flow grooves, and the valve seat is provided with an injection hole cooperating with the valve needle. 
     
     
         25 . The integrated apparatus as claimed in  claim 24 , wherein the water-cooled base is provided with a mounting slot, a first cooling passage, a second cooling passage spaced apart from the first cooling passage, and an end cap sealed at the periphery of the mounting slot; between the end cap and the second sleeve, the nozzle assembly forms an annular cooling groove establishing communication between the first cooling passage and the second cooling passage; the first cooling passage is connected to an inlet connector to allow the injection of an engine coolant, and the second cooling passage is connected to an outlet connector to allow the engine coolant to flow out. 
     
     
         26 . An exhaust gas post-processing system, comprising an injection system of exhaust gas post-processing and an encapsulated system of exhaust gas post-processing, wherein the injection system comprises the integrated apparatus as claimed in  claim 1 , and the encapsulated system comprises a support located downstream of the integrated apparatus. 
     
     
         27 . The exhaust gas post-processing system as claimed in  claim 26 , wherein the support comprises selective catalytic reduction, and the encapsulated system further comprises at least one mixer located between the integrated apparatus and the support. 
     
     
         28 . A control method for an integrated apparatus, wherein the integrated apparatus is the integrated apparatus as claimed in  claim 1 , the control method comprising:
 driving the rotor to operate, thereby driving the pump to rotate, and drawing the fluid medium into the pump through the inlet passage;   after pressurization by the pump, delivering the fluid medium to the nozzle through the outlet passage;   when an injection condition is attained, energizing the nozzle coil, and at least partially opening the nozzle in order to inject the fluid medium into intake gas or exhaust gas of the engine, wherein:   the electric machine coil and the nozzle coil are respectively subjected to independent control.