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CN-224214244-U - Urea pump and selective catalytic reduction system

CN224214244UCN 224214244 UCN224214244 UCN 224214244UCN-224214244-U

Abstract

The application relates to a urea pump (1) comprising a main filter (11) having a filter chamber (111), and a valve member (12) having a valve port (121), the filter chamber (111) having an outflow opening in fluid communication with the valve port (121), through which outflow opening an exhaust gas treatment agent within the filter chamber (111) leaves the filter chamber and flows towards the valve port (121), and which outflow opening is located below a transverse centre axis (A1) of the filter chamber (111) in a vertical direction (Z) in a use state of the urea pump (1). In addition, the application also relates to a corresponding selective catalytic reduction system. According to certain embodiments of the present application, structural barriers preventing gas within the filtration chamber from escaping from the valve member may be achieved by modifying the internal structure of the urea pump, thereby improving the pressure build-up capability of the urea pump. In addition, it may also allow for the elimination of a recirculation line from the urea pump to the storage tank in the selective catalytic reduction system.

Inventors

  • CAI YUE

Assignees

  • 博世动力总成有限公司

Dates

Publication Date
20260508
Application Date
20250710

Claims (10)

  1. 1. Urea pump, characterized in that the urea pump (1) comprises: A main filter (11) having a filter chamber (111), and A valve member (12) having a valve port (121), Wherein the filter chamber (111) has an outflow opening in fluid communication with the valve port (121), an exhaust gas treatment agent within the filter chamber (111) exits the filter chamber (111) through the outflow opening and flows to the valve port (121), and The outflow opening is located below a transverse central axis (A1) of the filter chamber (111) in a vertical direction (Z) in the use state of the urea pump (1).
  2. 2. The urea pump according to claim 1, characterized in that, The central axis (A2) of the valve member (12) is parallel to the lateral central axis (A1) of the filter chamber (111) and is located below the lateral central axis (A1) in a vertical direction (Z) in the use state of the urea pump (1).
  3. 3. A urea pump according to claim 1 or 2, characterized in that, The urea pump (1) comprises a flow path (115) in fluid communication with the valve port (121) and opening into the filter chamber (111), a port (1154) of the flow path (115) remote from the valve port (121) serving as the outflow opening and extending into the exhaust gas treatment agent in the filter chamber (111) in a use state of the urea pump (1).
  4. 4. A urea pump according to claim 3, characterized in that, The flow path (115) is arranged such that, in the use state of the urea pump (1), the port (1154) is located below a virtual horizontal line (L) in which the lowest point of the valve port (121) in the vertical direction (Z) is located, when the central axis (A2) of the valve member (12) is at an angle of 45 DEG to the horizontal direction, and/or The flow path (115) is embodied as a tube, and/or The port (1154) is located within the filter chamber (111) at a position of 1/5 to 4/5 of a lateral extension (d 2) of the filter chamber (111).
  5. 5. A urea pump according to claim 3, characterized in that, The flow path (115) narrows continuously or stepwise from the valve port (121) to the filter chamber (111), and/or The flow path (115) extends from the valve port (121) to the filter chamber (111) away from a transverse central axis (A1) of the filter chamber (111) in a continuous or segmented manner.
  6. 6. The urea pump according to claim 5, characterized in that, The flow path (115) has a first end (1151) connected to the valve port (121) and a second end (1152) providing the port (1154), the first end (1151) and the second end (1152) extending substantially linearly and being connected to each other by a centrally located bend (1153).
  7. 7. A urea pump according to claim 3, characterized in that, The flow path (115) extends from the valve port (121) through a filler block (114) of the main filter (11) into the filter chamber (111).
  8. 8. A urea pump according to claim 3, characterized in that, The flow path (115) extends from the valve port (121) through an end cap (112) of the main filter (11) into the filter chamber (111).
  9. 9. The urea pump according to any one of claims 1, 2, 4-8, characterized in that, The valve element (12) is arranged in the housing (116) of the main filter (11), and/or The valve member (12) includes a throttle valve (122) providing the valve port (121) and adjacent the filter chamber (111), and a one-way valve (123) remote from the filter chamber (111).
  10. 10. A selective catalytic reduction system, characterized in that the selective catalytic reduction system comprises: urea pump (1) according to any of claims 1-9; a tank (2) adapted to store an exhaust treatment agent, and An injection module (3) adapted to injecting the exhaust gas treatment agent, Wherein the urea pump (1) is connected on the inlet side (16) with the tank (2) via a supply line (4) for taking the exhaust gas treatment agent from the tank (2), and the urea pump (1) is connected on the outlet side (17) with the injection module (3) via a pressure line (5) for delivering the exhaust gas treatment agent to the injection module (3).

Description

Urea pump and selective catalytic reduction system Technical Field The application relates to a urea pump and a corresponding selective catalytic reduction system. Background Work machines, particularly diesel engine vehicles, are often provided with a Selective Catalytic Reduction (SCR) system for exhaust gas treatment. Taking a diesel engine vehicle as an example, the tail gas contains harmful nitrogen oxides, and the harmful nitrogen oxides in the tail gas can be reduced into nitrogen and water through an SCR system, so that the environment-friendly emission requirement is met. The urea pump is a core component of the SCR system, and the main function of the urea pump is to pump the exhaust gas treatment agent from the storage tank and convey the exhaust gas treatment agent to the nozzle, and the exhaust gas treatment agent sprayed from the nozzle can enter the exhaust gas flow and react with nitrogen oxides in the exhaust gas flow. In addition, conventional SCR systems are also provided with a recirculation line from the urea pump to the storage tank to prevent urea from freezing. However, it has been found in practice that the existing urea pump may have problems of unstable pressure of the main pump and reduced working efficiency caused by escape of gas in the pump body from the throttle valve during pumping, which makes it easy to have problems of pressure build-up failure or pressure drop and pressure loss. Disclosure of utility model The object of the present application is to provide an improved urea pump and a corresponding selective catalytic reduction system in order to solve at least one of the technical problems mentioned above and/or other technical problems not mentioned. According to a first aspect of the present application there is provided a urea pump comprising a main filter having a filter chamber and a valve member having a valve port, wherein the filter chamber has an outflow opening in fluid communication with the valve port, an exhaust gas treatment agent within the filter chamber exits the filter chamber through the outflow opening and flows towards the valve port, and the outflow opening is located vertically below a transverse centre axis of the filter chamber in a state of use of the urea pump. According to an alternative embodiment of the application, the central axis of the valve member is parallel to and vertically below the lateral central axis of the filter chamber in the use state of the urea pump. According to an alternative embodiment of the application, the urea pump comprises a flow path in fluid communication with the valve port and opening into the filter chamber, a port of the flow path remote from the valve port acting as the outflow opening and extending into the exhaust gas treatment agent in the filter chamber in a state of use of the urea pump. According to an alternative embodiment of the application, the flow path is arranged such that, in the use state of the urea pump, the port is located below a virtual horizontal line in which the lowest point of the valve port in the vertical direction is located, when the central axis of the valve member is at an angle of 45 ° to the horizontal. According to an alternative embodiment of the application, the flow path is implemented as a tube. According to an alternative embodiment of the application, the port is located in the filter chamber at a position of 1/5 to 4/5 of the lateral extension of the filter chamber. According to an alternative embodiment of the application, the flow path narrows from the valve port to the filter chamber in a continuous or stepwise manner. According to an alternative embodiment of the application, the flow path extends from the valve port to the filter chamber away from the transverse centre axis of the filter chamber in a continuous or stepwise manner. According to an alternative embodiment of the application, the flow path has a first end connected to the valve port and a second end providing the port, the first and second ends extending substantially linearly and being connected to each other by a centrally located bend. According to an alternative embodiment of the application, the flow path extends from the valve port through the filler block of the main filter into the filter chamber. According to an alternative embodiment of the application, the flow path extends from the valve port through an end cap of the main filter into the filter chamber. According to an alternative embodiment of the application, the valve member is arranged in the housing of the main filter. According to an alternative embodiment of the application, the valve member comprises a throttle valve providing the valve port and adjacent the filter chamber, and a one-way valve remote from the filter chamber. According to a second aspect of the application there is provided a selective catalytic reduction system comprising a urea pump according to any of the applications, a storage tank adapted to store an exhaust