Title:
EXHAUST GAS PURIFICATION SYSTEM FOR CONSTRUCTION MACHINE
Document Type and Number:
WIPO Patent Application WO/2018/025439
Kind Code:
A1
Abstract:
Provided is an exhaust gas purification system for a construction machine with which it is possible to prevent urea water (remaining in the piping of a urea water replenishment circuit after replenishment of urea water in a urea water tank) from being affected by heat from an engine, operating oil tank, or the like, and deteriorating. A first return pipe 9 connecting a urea water injection device 4 to a urea water tank 6 and a second return pipe 10 connecting the urea water injection device 4 to a pipe 11 in a urea water replenishment circuit 201 are provided in a urea water return circuit 202, which returns to the urea water tank 6 excess urea water that has not been injected into exhaust gas from the urea water injection device 4. The valve-opening pressure of a first check valve 15 provided in the first return pipe 9 is set so as to be higher than the valve-opening pressure of a second check valve 16 provided in the second return pipe 10.
More Like This:
| JP3775299 | EXHAUST EMISSION CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE |
| WO/2016/088407 | EXHAUST GAS TREATMENT DEVICE |
| WO/2009/128407 | EXHAUST PURIFYING SYSTEM FOR INTERNAL COMBUSTION ENGINE |
Inventors:
SAKURAI MASATOSHI (JP)
Application Number:
PCT/JP2017/009683
Publication Date:
February 08, 2018
Filing Date:
March 10, 2017
Export Citation:
Assignee:
HITACHI CONSTRUCTION MACH CO (JP)
International Classes:
F01N3/08; B01D53/94; E02F9/00
Foreign References:
| JP2010248944A | 2010-11-04 | |||
| JP2000264078A | 2000-09-26 | |||
| JP2016084724A | 2016-05-19 |
Other References:
See also references of EP 3409913A4
Attorney, Agent or Firm:
KAICHI IP (JP)
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