An internal-mixing urea pump

Abstract

The utility model discloses an inner mixing type urea pump, it includes: pump body, the pump body includes pump casing, the accommodating cavity of opening in the pump casing, the pump liquid inlet of opening in the pump casing and with accommodating cavity intercommunication, the pressure cavity of opening in the pump casing, the pump liquid outlet of opening in the pump casing and with pressure cavity intercommunication, form in the pump casing and with accommodating cavity intercommunication's liquid inlet interface and form in the pump casing and with pressure cavity intercommunication's atomization liquid outlet mechanism, pressurization subassembly, pressurization subassembly is linked with pump liquid inlet and pump liquid outlet intercommunication for the pressurization delivery of urea solution. Can utilize pressurization subassembly to the pressurization delivery of urea solution that passes, adapts high load under the big flow supply, improves system response speed.

Description

Technical Field

[0001] This utility model belongs to the technical field of diesel engine exhaust aftertreatment equipment, and relates to an internal mixing urea pump, specifically an internal mixing high-flow urea pump for a train exhaust aftertreatment SCR system. Background Technology

[0002] In railway diesel engine exhaust emission reduction, the SCR system reduces nitrogen oxides (NOx) in the exhaust gas by injecting urea solution. x The reaction converts it into nitrogen and water.

[0003] Currently, most commonly used urea pumps have a single nozzle and are externally mixed, which suffers from insufficient spray coverage, low atomization efficiency, and unstable injection volume under high load, affecting the emission reduction effect of the SCR system. For example, Chinese utility model patent application number 201620028929.X discloses an electromagnetic valveless urea pump system, including a nozzle connected to an air inlet pipe and a urea filling port pipe. The air inlet pipe is sequentially equipped with an air inlet, a forced-blowing valve, and an air pressure regulator. The forced-blowing valve is directly connected to the nozzle and the air pressure regulator via a pipe. The urea filling port pipe is sequentially equipped with a urea filling port, an electromagnetic pump, a return solenoid valve, a pressure stabilizing chamber, and a valveless pump. The pressure stabilizing chamber is equipped with a temperature sensor and a pressure sensor. A pressure sensor at the valveless pump outlet detects the injection pressure. The external mixing air path consists of a conventional air path and a forced-blowing air path, controlled by a three-position four-way valve. This electromagnetic valveless urea pump system uses an external mixing air path, which suffers from unstable injection volume under high load.

[0004] Therefore, a high-flow urea pump with improved structure is needed to achieve more uniform atomization coverage and stable high-flow supply within a limited installation space. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art by providing an internal mixing urea pump.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is: an internal mixing urea pump, which includes: The pump body includes a pump housing, a receiving cavity formed within the pump housing, a pump inlet formed within the pump housing and communicating with the receiving cavity, a pressure cavity formed within the pump housing, a pump outlet formed within the pump housing and communicating with the pressure cavity, an inlet port formed on the pump housing and communicating with the receiving cavity, and an atomizing liquid outlet mechanism formed on the pump housing and communicating with the pressure cavity. The atomizing liquid outlet mechanism includes a base formed on the side of the pump housing, at least one liquid outlet channel formed within the base and communicating with the pressure cavity, an atomizing valve mounted on the base and corresponding to each liquid outlet channel, and an outlet port formed on the base and communicating with the liquid outlet channel. A pressurizing assembly is connected to the pump inlet and the pump outlet respectively, and is used for pressurizing and delivering urea solution.

[0007] Optimally, the pump body also includes a filter element installed in the receiving cavity, the filter element cooperating with the pump inlet.

[0008] Furthermore, the pressurization component is a gear pump.

[0009] Furthermore, the pump body also includes a pressure sensor installed on or embedded in the pump housing and cooperating with the pressure chamber.

[0010] Furthermore, the pump body also includes an overflow valve formed on the pump housing and connected to the pressure chamber.

[0011] Optimally, the atomizing liquid dispensing mechanism further includes a flow sensor mounted on the substrate and extending into the liquid dispensing channel.

[0012] Due to the application of the above technical solutions, this utility model has the following advantages compared with the prior art: The internal mixing urea pump of this utility model, by adopting a pump body with a specific structure and cooperating with a pressurizing component, can use the pressurizing component to pressurize and transport the passing urea solution, adapting to the large flow supply under high load, and improving the system response speed; moreover, by further adopting an atomizing valve, the urea solution and air can be fully mixed in the liquid outlet channel, thereby improving the atomization uniformity and reducing ammonia escape. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the internal mixing urea pump of this utility model; Figure 2 for Figure 1 Cross-sectional view; Figure 3 for Figure 2 The front view. Detailed Implementation

[0014] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0015] The following descriptions of embodiments are taken with reference to the accompanying drawings, illustrating specific embodiments in which this utility model can be implemented. Directional terms used in this utility model, such as "upper," "lower," "front," "rear," "left," "right," "inner," "outer," and "side," are merely for directional reference to the drawings. Therefore, the directional terms used are for illustration and understanding of this application, and not for limiting this application. Furthermore, in the specification, unless explicitly stated otherwise, the words "comprising" or "including" should be understood to mean including the element, but not excluding any other elements.

[0016] like Figures 1 to 3 The internal mixing urea pump shown mainly includes a matching pump body 1 and a pressurizing component 2.

[0017] The pump body 1 includes a pump housing 11, a receiving cavity 12, a liquid inlet 14, a pump inlet 15, a pump outlet 16, a pressure chamber 17, and an atomizing liquid outlet mechanism 19.

[0018] A receiving cavity 12 is formed inside the pump housing 11 for installing the filter element 13; a pump inlet 15 is formed inside the pump housing 11 and communicates with the receiving cavity 12 for introducing urea solution from the receiving cavity 12 into the pressurizing assembly 2; a pressure chamber 17 is formed inside the pump housing 11; and a pump outlet 16 is formed inside the pump housing 11 and communicates with the pressure chamber 17, delivering pressurized urea solution into the pressure chamber 17 via the pressurizing assembly 2. It can be seen that the pressurizing assembly 2 is connected to both the pump inlet 15 and the pump outlet 16, receiving the urea solution input through the pump inlet 15, pressurizing it, and then outputting it through the pump outlet 16. In this embodiment, the pump body 1 also includes a filter element 13 installed in the receiving cavity 12, which cooperates with the pump inlet 15 to filter out impurities in the urea solution; that is, the urea solution enters the interior of the filter element 13 after being filtered by the filter element 13, and then flows from the interior of the filter element 13 into the pump inlet 15. The pressurization component 2 is preferably a gear pump.

[0019] The inlet port 14 is formed on the pump housing 11 and connected to the receiving cavity 12 (the forming method can be conventional, such as installation or welding, the same below), for inputting urea solution into the receiving cavity 12; specifically, the inlet port 14 can be connected to the urea storage tank (for storing urea solution) through a pipeline.

[0020] The atomizing liquid outlet mechanism 19 is formed on the pump housing 11 and communicates with the pressure chamber 17, and is used to atomize and spray the pressurized urea solution. Specifically, the atomizing liquid outlet mechanism 19 includes a base 191 formed on the side of the pump housing 11, at least one liquid outlet channel 192 (preferably two channels in this embodiment) opened in the base 191 and communicates with the pressure chamber 17, an atomizing valve 194 (preferably two atomizing valves 194 in this embodiment) installed on the base 191 and corresponding to the liquid outlet channel 192, and a liquid outlet interface 195 formed on the base 191 and communicates with the liquid outlet channel 192 (preferably two liquid outlet interfaces 195 in this embodiment, corresponding to the liquid outlet channel 192; the liquid outlet interface 195 can be connected to the nozzle through a pipeline, so that the nozzle angle is adjustable, the spray coverage area can be expanded, and the SCR reduction reaction efficiency can be improved). In this way, the urea solution and air can be fully and evenly mixed in the liquid outlet channel 192 through the atomizing valve 194 to form an atomized flow.

[0021] In this embodiment, the pump body 1 also includes a pressure sensor 10 installed on or embedded in the pump housing 11 and cooperating with the pressure chamber 17, for monitoring the pressure of the urea solution in the pressure chamber 17. The pump body 1 also includes an overflow valve 18 formed on the pump housing 11 and connected to the pressure chamber 17. The overflow valve 18 can be connected to the aforementioned urea storage tank through a pipeline. Thus, when the pressure of the urea solution in the pressure chamber 17 is greater than the working threshold of the overflow valve 18, the urea solution flows out through the overflow valve 18 and enters the urea storage tank. The atomizing liquid dispensing mechanism 19 also includes a flow sensor 193 (preferably two flow sensors 193 are also present, corresponding one-to-one with the liquid dispensing channels 192) installed on the base 191 and extending into the liquid dispensing channel 192. They are located upstream of the corresponding atomizing valve 194 and are used to monitor the flow rate of the urea solution passing through the liquid dispensing channel 192.

[0022] This invention, through the use of a pump body 1 with a specific structure in conjunction with a pressurizing component 2, enables the pressurizing and delivery of the passing urea solution, adapting to high-flow-rate supply under high loads and improving system response speed. Furthermore, the use of an atomizing valve 194 allows for thorough mixing of the urea solution and air within the outlet channel 192, thereby improving atomization uniformity and reducing ammonia escape. The compact structure facilitates installation within the limited space of a locomotive exhaust pipe.

[0023] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. An internal mixing urea pump, characterized in that it include: The pump body (1) includes a pump housing (11), a receiving cavity (12) opened in the pump housing (11), a pump inlet (15) opened in the pump housing (11) and communicating with the receiving cavity (12), a pressure cavity (17) opened in the pump housing (11), a pump outlet (16) opened in the pump housing (11) and communicating with the pressure cavity (17), an inlet port (14) formed on the pump housing (11) and communicating with the receiving cavity (12), and a pump body (11) formed on the pump housing (11). The atomizing liquid outlet mechanism (19) is connected to the pressure chamber (17). The atomizing liquid outlet mechanism (19) includes a base (191) formed on the side of the pump housing (11), at least one liquid outlet channel (192) opened in the base (191) and connected to the pressure chamber (17), an atomizing valve (194) installed on the base (191) and correspondingly cooperating with the liquid outlet channel (192), and a liquid outlet interface (195) formed on the base (191) and connected to the liquid outlet channel (192). The pressurizing component (2) is connected to the pump inlet (15) and the pump outlet (16) respectively, and is used for pressurizing and transporting urea solution.

2. The internal mixing urea pump according to claim 1, characterized in that: The pump body (1) also includes a filter element (13) installed in the receiving cavity (12), and the filter element (13) cooperates with the pump inlet (15).

3. The internal mixing urea pump according to claim 1 or 2, characterized in that: The pressurization component (2) is a gear pump.

4. The internal mixing urea pump according to claim 1 or 2, characterized in that: The pump body (1) also includes a pressure sensor (10) installed on the pump housing (11) or embedded in the pump housing (11) and cooperating with the pressure chamber (17).

5. The internal mixing urea pump according to claim 4, characterized in that: The pump body (1) also includes an overflow valve (18) formed on the pump housing (11) and connected to the pressure chamber (17).

6. The internal mixing urea pump according to claim 1, characterized in that: The atomizing liquid dispensing mechanism (19) also includes a flow sensor (193) mounted on the substrate (191) and extending into the liquid dispensing channel (192).

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