A common rail assembly used in a urea injection system, comprising at least a first common rail and a second common rail which are connected to each other, wherein the first common rail comprises a first housing, a pressure detecting device mounted on the first housing and a pressure adjusting devic
A common rail assembly used in a urea injection system, comprising at least a first common rail and a second common rail which are connected to each other, wherein the first common rail comprises a first housing, a pressure detecting device mounted on the first housing and a pressure adjusting device. The first housing comprises a first urea inlet channel, a first urea outlet channel, at least one first feeding inlet connected to the first urea inlet channel and at least one first back-flow outlet connected to the first urea outlet channel. The pressure detecting device is connected to the first urea inlet channel. The pressure adjusting device can connect/disconnect the first urea inlet channel to/from the first urea outlet channel. Also disclosed are a urea injection system and the application of the common rail assembly. A proper number of common rails selected based on different application requirements can be combined together by at least connecting the first common rail to the second common rail in series. The extension capability thereof is relatively high.
대표청구항▼
1. A common-rail assembly used in a urea injection system, characterized in that said common-rail assembly comprises at least a first common rail and a second common rail which are connected to each other, wherein said first common rail comprises a first housing, and a pressure detecting device and
1. A common-rail assembly used in a urea injection system, characterized in that said common-rail assembly comprises at least a first common rail and a second common rail which are connected to each other, wherein said first common rail comprises a first housing, and a pressure detecting device and a pressure adjusting device installed on said first housing; said first housing comprises a first urea inlet channel where a urea solution enters, a first urea outlet channel where the urea solution flows out, at least one first feeding inlet connected to said first urea inlet channel, and at least one first back-flow outlet connected to said first urea outlet channel; said pressure detecting device is connected to said first urea inlet channel; said pressure adjusting device is connected between said first urea inlet channel and said first urea outlet channel, and said pressure adjusting device can connect or disconnect said first urea inlet channel and said first urea outlet channel; said second common rail comprises a second housing, and said second housing comprises a second urea inlet channel connected to said first urea inlet channel, a second urea outlet channel connected to said first urea outlet channel, at least one second feeding inlet connected to said second urea inlet channel, and at least one second back-flow outlet connected to said second urea outlet channel, wherein said first housing roughly takes the shape of a cuboid, and comprises a first end face, a second end face, a third end face, and a fourth end face, wherein said first end face is set opposite said second end face, and said third end face is set opposite said fourth end face; said first urea inlet channel and said first urea outlet channel run through said first end face and/or second end face, said first feeding inlet runs through said third end face, and said first back-flow outlet runs through said fourth end face. 2. The common-rail assembly as claimed in claim 1, wherein a plurality of said first feeding inlets are provided, and said first common rail is equipped with first feeding connectors connected to each first feeding inlet; a plurality of said first back-flow outlets are provided, and said first common rail is equipped with first back-flow connectors connected to each first back-flow outlet; wherein the number of said first back-flow connectors is the same as the number of said first feeding connectors. 3. The common-rail assembly as claimed in claim 2, wherein said first feeding connectors are arranged at intervals between said first end face and said second end face, said first back-flow connectors are also arranged at intervals between said first end face and said second end face, said first feeding connectors are in the opposite direction to said first back-flow connectors, and each first feeding inlet is aligned with the corresponding first back-flow outlet. 4. The common-rail assembly according to claim 2, wherein a urea mass sensor is installed on at least one first feeding connector. 5. The common-rail assembly as claimed in claim 1, wherein said first urea inlet channel and said first urea outlet channel are parallel to each other, said first feeding connector is perpendicular to said first urea inlet channel, and said back-flow connector is perpendicular to said first urea outlet channel. 6. The common-rail assembly as claimed in claim 1, wherein said common-rail assembly comprises a first connection pipe which connects said first urea inlet channel and said second urea inlet channel, and a second connection pipe which connects said first urea outlet channel and said second urea outlet channel. 7. The common-rail assembly as claimed in claim 1, wherein said first housing further comprises a front face perpendicular to said first, second, third, and fourth end faces, and a back face opposite said front face, wherein a mounting hole passing through said back face is provided at each of the four corners of said front face. 8. The common-rail assembly as claimed in claim 1, wherein said first housing further comprises a front face perpendicular to said first, second, third, and fourth end faces, and a back face opposite said front face, wherein a mounting groove used for mounting said pressure adjusting device is set on said back face. 9. The common-rail assembly as claimed in claim 8, wherein said pressure adjusting device is a pressure control valve, and said pressure control valve is opened when said pressure detecting device detects that the pressure is greater than a set value. 10. A urea injection system used for treating exhaust of engines, said urea injection system comprising a urea tank, a fluid delivery device used to pump out urea solution in said urea tank, a common-rail assembly connected to said fluid delivery device, nozzles connected to said common-rail assembly, and a controller used to control said urea injection system, said fluid delivery device comprising a pump used to pump a urea solution, and said common-rail assembly being the common-rail assembly as claimed in claim 1, wherein said nozzles are connected to said first feeding inlets. 11. The application of a common-rail assembly in the exhaust post-treatment system of a diesel engine with a power rating above 500 kilowatts, wherein said common-rail assembly is the common-rail assembly as claimed in claim 1.
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