Cleaning method and device for urea pump

A urea pump and cleaning technology, which is applied in the direction of noise reduction device, exhaust device, electric control of exhaust gas treatment device, etc., can solve problems such as blockage and system failure, and achieve the effect of avoiding impurity blockage.

Active Publication Date: 2020-03-24
WEICHAI POWER CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, during the verification process of the National VI vehicle market, the filter screen of the suction pipe joint of the urea pump was blocked by impurities more frequently, which made it unable to work under normal pressure, and even caused the SCR system to malfunction.

Method used

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  • Cleaning method and device for urea pump
  • Cleaning method and device for urea pump
  • Cleaning method and device for urea pump

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Embodiment Construction

[0055] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0056] It should be noted that concepts such as "first" and "second" mentioned in this application are only used to distinguish different devices, modules or units, and are not used to limit the sequence of functions performed by these devices, modules or units or interdependence, and the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes no...

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Abstract

The invention provides a cleaning method and device for a urea pump. The cleaning method comprises the steps: after a powering-on instruction is obtained, whether the upstream exhausting temperature in a post-processing box is smaller than the pressure buildup temperature of the urea pump or not is judged; and when it is judged that the upstream exhausting temperature in the post-processing box issmaller than the pressure buildup temperature of the urea pump, urea does not need to be sprayed by the urea pump at the moment, and thus a motor and a reversing valve in the urea pump are controlledto clean the urea pump in time so as to achieve the purpose that a filter screen of a liquid suction pipe joint of the urea pump is prevented from being blocked by impurities.

Description

technical field [0001] The present application relates to the technical field of tail gas treatment, in particular to a method and device for cleaning a urea pump. Background technique [0002] At present, the selective catalytic reduction (Selective Catalytic Reduction, SCR) post-treatment technology has been widely applied to the National V and National VI vehicles. [0003] However, in the verification process of the National VI vehicle market, it is more frequent that the filter screen of the suction pipe joint of the urea pump is blocked by impurities, which makes it unable to work under normal pressure, and even causes the SCR system to fail. [0004] Therefore, there is an urgent need for a method that can clean the urea pump in time to prevent the filter screen of the suction pipe joint of the urea pump from being blocked by impurities. Contents of the invention [0005] In view of this, embodiments of the present application provide a method and device for cleani...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N9/00F01N11/00
CPCF01N9/00F01N11/00F01N11/002F01N2610/02F01N2610/144Y02T10/40
Inventor 宋勃震王远景王瑞张金花
Owner WEICHAI POWER CO LTD
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