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Aqueous urea supply system for construction machine

A supply system and construction machinery technology, applied in mechanical equipment, engine components, combustion engines, etc., can solve the problems of urea water freezing, inability to cool water pipe supply pipes, etc., and achieve the effect of simple structure

Active Publication Date: 2016-05-04
NIHON KENKI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In the technology disclosed in the above-mentioned Patent Document 1, etc., the urea water supply pipe and the cooling water pipe for circulating the engine cooling water are connected to the urea water tank and the urea water supply device through a connector, and there is the following problem: The cooling water piping cannot be arranged along the urea water supply pipe in some parts, and the urea water is easy to freeze in the connector part

Method used

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  • Aqueous urea supply system for construction machine
  • Aqueous urea supply system for construction machine
  • Aqueous urea supply system for construction machine

Examples

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Embodiment Construction

[0034] One embodiment of the urea water supply system for a construction machine according to the present invention will be described below based on the drawings.

[0035] figure 1 A construction machine with the urea water supply system of the present invention is shown. In this embodiment, a crawler-type hydraulic excavator will be described as an example of a construction machine.

[0036] Such as figure 1 As shown, the hydraulic excavating mechanism has a traveling body 1, a rotating body 2 arranged on the traveling body 1 and mainly composed of a rotating frame 3, and an operation such as excavating sand and soil installed on the rotating body 2. device 4.

[0037] The working device 4 is configured to include a boom 5 rotatably attached to the swivel frame 3 in the up-down direction, an arm 6 rotatably attached to the front end of the boom 5 in the up-down direction, and an arm 6 rotatably attached in the up-down direction. A bucket 7 further mounted on the front end...

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Abstract

In order to purify NOx in exhaust gas discharged from an engine, an aqueous urea supply system is constructed with an aqueous urea injection valve, an aqueous urea tank, an aqueous urea supply pipe (22), and an aqueous urea supply device (30). A cooling water pipe (40) for distributing engine cooling water is disposed along the aqueous urea supply pipe (22), the cooling water pipe (40) is connected to the aqueous urea supply device (30) by an inflow pipe connection part (34) and an outflow pipe connection part (35), and a portion (46) of the inflow pipe is disposed close to connection parts (31, 32, 33) of the aqueous urea supply pipe (22) to the aqueous urea supply device (30) and within a prescribed distance range in which heat of the cooling water can reach the connection parts.

Description

technical field [0001] The invention relates to a urea water supply system for engineering machinery, in particular to a technology for preventing urea water from freezing or quickly thawing frozen urea water. Background technique [0002] A construction machine such as a hydraulic excavator is configured to include a traveling body that can be driven by a traveling motor, a revolving body disposed on the traveling body, and a working device that is attached to the revolving body and performs excavation of sand and soil. The revolving body has a cab on one side in the width direction across the mounting portion of the work equipment, and has a hydraulic pump located on the back side of the cab to supply hydraulic oil to the travel motor and the work equipment, and a hydraulic pump for driving the work equipment. An engine that operates a hydraulic pump. The engine mounted on construction machinery is usually a diesel engine. [0003] However, in recent years, as the reduct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/08
CPCF01N3/2066F01N13/14F01N2590/08F01N2610/02F01N2610/10F01N2610/14E02F9/0883F01N2610/1406F01N3/2889F01N2240/02F01N2610/11Y02T10/12F01N3/2896
Inventor 真野英德神谷象平藤井俊宪
Owner NIHON KENKI CO LTD
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