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Structure for preventing pump from being damaged by liquid freezing in pump in SCR (Selective Catalytic Reduction) system

A SCR system, anti-damage technology, applied in the direction of internal combustion piston engine, exhaust gas treatment, mechanical equipment, etc., can solve the problem of single anti-icing technology of urea metering pump, etc., to ensure the use environment, increase the expansion space, and ensure normal operation. effect used

Inactive Publication Date: 2016-02-24
天津星洁汽车排放控制系统有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, the present invention aims to propose a liquid freezing and damage prevention structure in the pump in the SCR system to solve the single problem of the existing urea metering pump anti-freezing technology

Method used

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  • Structure for preventing pump from being damaged by liquid freezing in pump in SCR (Selective Catalytic Reduction) system
  • Structure for preventing pump from being damaged by liquid freezing in pump in SCR (Selective Catalytic Reduction) system

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Embodiment Construction

[0026] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0027] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0028] Such as Figure 1-Figure 2 As shown, a structure for preventing damage caused by freezing of liquid in the pump in an SCR system includes a pump body 1, a pressure sensor installation cavity 6 is provided on the upper part of the pump body 1, and a pressure sensor is installed inside the pump body 1 The flow channel 5, the inlet 51 of the pressure sensor inlet channel communicates with the main channel of the SCR system, the outlet 52 of the pressure sensor inlet channel communicates with the pressure sensor installation cavity 6, and the pump body 1 is also connected with the SCR system The main channel of the main channel is connected in series with a first liquid inlet channel...

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Abstract

The invention provides a structure for preventing a pump from being damaged by liquid freezing in the pump in an SCR (Selective Catalytic Reduction) system. The structure comprises a pump body; a pressure sensor mounting cavity is formed in the upper portion of one side surface of the pump body; a pressure sensor liquid inlet runner is formed in the pump body; the pump body is further provided with a first liquid inlet channel which is in series connection with a main runner of the SCR system; the first liquid inlet channel is horizontally arranged; an inlet of the first liquid inlet channel is in a horn shape with the opening facing outwards; a groove is formed in the inner wall of the inlet of the first liquid inlet channel; a first elastomer is embedded into the groove. By means of the structure for preventing the pump from being damaged by liquid freezing in the pump in the SCR system, as the runners are optimized, it is guaranteed that the liquid residuals in the pump body are minimized, the expansion space of the liquid is enlarged, and it is guaranteed that the pump body cannot be damaged by liquid freezing; the cost is reduced; the working stability of the pump body is guaranteed; products have certain reliability.

Description

technical field [0001] The invention belongs to the technical field of automobile environmental protection, and in particular relates to a liquid freezing and damage prevention structure in a pump in an SCR system. Background technique [0002] At present, more than 90% of heavy-duty commercial vehicles are equipped with diesel engines. Selective Catalytic Reduction (SCR) technology is the mainstream technical route to achieve diesel engine exhaust emissions meeting National IV and above regulations, that is, reduce soot through internal purification, and then use SCR Systematically reduce NOx emissions to meet regulations; the SCR system uses urea as a reducing agent (also known as Tianlan), and performs a reduction reaction under the action of a selective catalyst to reduce harmful NOx to harmless nitrogen and water. In the SCR system, it includes urea aqueous solution storage tank, urea metering pump and nozzle, catalytic muffler, pressure sensor and other components, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/28F01N11/00
CPCY02T10/40
Inventor 魏罡王蒸杨绍龙
Owner 天津星洁汽车排放控制系统有限公司
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