Search International and National Patent Collections

1. (WO2018077005) UREA TUBE HAVING ONE-WAY THROTTLING FUNCTION, UREA SPRAYING SYSTEM AND CONTROL METHOD THEREFOR

Pub. No.:    WO/2018/077005    International Application No.:    PCT/CN2017/104329
Publication Date: Fri May 04 01:59:59 CEST 2018 International Filing Date: Sat Sep 30 01:59:59 CEST 2017
IPC: F01N 3/28
F01N 3/20
Applicants: TENNECO (SUZHOU) EMISSION SYSTEM CO., LTD.
天纳克(苏州)排放系统有限公司
Inventors: TONG, Yi
童毅
SUN, Shuping
孙树平
WANG, Fei
王飞
LI, Min
李敏
YANG, Huimin
杨慧敏
Title: UREA TUBE HAVING ONE-WAY THROTTLING FUNCTION, UREA SPRAYING SYSTEM AND CONTROL METHOD THEREFOR
Abstract:
A urea tube (100) having a one-way throttling function, comprising a quick connector plug (1), a urea outlet connector (2) in communication with the quick connector plug (1), and a bypass tube assembly (3) in communication with the urea outlet connector (2). The bypass tube assembly (3) comprises a urea-resistant nylon tube (31), a resistance wire (32) wound around the urea-resistant nylon tube (31) and used for heating the urea-resistant nylon tube (31), a thermally conductive layer (33) located at the periphery of the resistive wire (32) and used for defining the resistance wire (32), a thermal insulation layer (34) wrapped around the thermally conductive layer (33), and a corrugated sleeve (35) wrapped around the thermal insulation layer (34). A one-way throttle (36) is mounted in the bypass tube assembly (3). Further provided are a urea spraying system and a control method therefor. The urea tube (100) having a one-way throttling function can return urea to a urea tank (300) when the system pressure is high, so as to protect a urea pump. Moreover, the present invention has a reverse blocking function when a gear pump pumps in a reverse direction, so that the urea in a urea pressure tube can flow back to the urea tank.