Structure of container for reducing agent

Abstract

On the upper surface of a container body, there are installed at least a base section of a water level meter for detecting the remaining amount of a liquid reducing agent, a base section of a concentration meter for detecting the concentration of the liquid reducing agent, a heat exchanger surrounding each of detection sections of the water level meter and the concentration meter and exchanging heat between an engine coolant and the liquid reducing agent by circulating the engine coolant, and a suction tube provided between the water level gauge and the concentration meter and sucking the liquid reducing agent from the bottom of the container body. A substantially box-like protector is installed so as to surround the water level meter, concentration meter, and suction tube that are positioned at the lower part of the heat exchanger. Heat discharged from the lower part of the heat exchanger is confined inside the protector, and convection is produced in the confined region. By this, the liquid reducing agent frozen around the water level meter, concentration meter, and suction tube is efficiently thawed.

Description

technical field [0001] The present invention relates to the structure of a reductant container for storing a liquid reductant used in an exhaust gas purification device for reducing and purifying nitrogen oxides (NOx) in exhaust gas, and particularly relates to a structure that can be used in a short time after starting an engine. Technology that exerts exhaust gas purification functions. Background technique [0002] Japanese Unexamined Patent Publication No. 2000-27627 (Patent Document 1) discloses an exhaust gas purification system as a catalytic purification system for removing NOx contained in engine exhaust gas. [0003] The above-mentioned exhaust purification device injects and supplies a liquid reductant corresponding to the engine operating state upstream of the exhaust gas of the reduction catalyst arranged on the engine exhaust pipe, so that the NOx in the exhaust gas and the liquid reductant undergo a catalytic reduction reaction, and the NOx purification treat...

AI Technical Summary

Problems solved by technology

At the bottom of the reductant container, there are detection parts of a water level gauge and a concentration meter for detecting the remaining amount and concentration of the liquid reductant, and a suction port for the liquid reductant, so as long as the liquid reductant freezes slightly There is a possibility that not only the remaining amount and concentration of the liquid reducing agent cannot be detected, but also the liquid reducing agent cannot be supplied to the reduction catalyst.

For this reason, a heat exchanger is installed on the reducing agent container to circulate the engine cooling water and exchange heat with the liquid reducing agent. The thawing of the liquid reducing agent takes a certain amount of time

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