Regeneration fuel nozzle cleaning system and diesel engine

Abstract

The utility model discloses a regeneration fuel nozzle cleaning system which comprises a gas cylinder, a high-pressure air cut-off valve and a fuel air switching valve, the fuel air switching valve is provided with a first inlet, a second inlet and an outlet, the first inlet is connected with the high-pressure air cut-off valve through an air pipe, and the second inlet is connected with the high-pressure air cut-off valve through an air pipe. The high-pressure air cut-off valve is connected with the gas cylinder through an air pipe; the second inlet is connected with a fuel pipe, and the outlet is connected with a regenerated fuel nozzle; according to the utility model, high-pressure air in the high-pressure gas cylinder is used for cleaning the regenerated fuel nozzle; and switching of fuel oil and high-pressure air is achieved through the fuel oil and air switching valve, fuel oil generated after regeneration on the regeneration fuel oil nozzle is finished is cleaned in time, and the problem that the regeneration fuel oil nozzle is blocked is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of fuel nozzle cleaning, and in particular relates to a fuel nozzle cleaning system for regeneration and a diesel engine. Background Art

[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] When a diesel engine DPF is regenerated, a portion of the fuel is not burned in the combustion chamber but directly oxidized and burned on the DOC to increase the temperature of the DPF and burn the captured carbon particles. For example, Chinese utility model patent CN208057194U discloses a DPF active regeneration combustion-supporting system, in which a bracket mounts the regeneration fuel nozzle on the exhaust pipe. For this structure of the DPF active regeneration combustion-supporting system, after the regeneration is completed, the fuel nozzle stops spraying fuel, but some fuel remains. The high temperature in the exhaust pipe and the impurities in the exhaust gas can easily clog the fuel nozzle after a certain period of time, resulting in the inability to spray fuel and regenerate normally during the next regeneration. The existing fuel nozzle cleaning method is usually to disassemble the fuel nozzle for cleaning. Since the fuel nozzle is a very precise device, this method is not only cumbersome to operate, but also damages the structure of the fuel nozzle. At the same time, since the installation space of the fuel nozzle on the exhaust pipe is small, this method is not applicable. Utility Model Content

[0004] The utility model aims to provide a regeneration fuel nozzle cleaning system, which can timely clean the fuel produced on the regeneration fuel nozzle after regeneration is completed, and can solve the problem of clogging of the regeneration fuel nozzle.

[0005] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0006] In the first aspect, an embodiment of the utility model provides a regeneration fuel nozzle cleaning system, including a gas cylinder, a high-pressure air cut-off valve and a fuel-air switching valve, the fuel-air switching valve being provided with a first inlet, a second inlet and an outlet, the first inlet being connected to the high-pressure air cut-off valve via an air pipe, and the high-pressure air cut-off valve being connected to the gas cylinder via an air pipe; the second inlet being connected to the fuel pipe, and the outlet being connected to the regeneration fuel nozzle.

[0007] As a further technical solution, the fuel-air switching valve is electrically connected to a controller, and the connection between the air pipe and the fuel pipe is switched under the control of the controller.

[0008] As a further technical solution, a fuel cut-off valve is further provided on the fuel pipe, and the fuel-air switching valve is provided downstream of the fuel cut-off valve.

[0009] As a further technical solution, the gas cylinder is a high-pressure gas cylinder, and the high-pressure gas cylinder is filled with high-pressure air.

[0010] As a further technical solution, when regeneration is not performed, the high-pressure air shut-off valve remains closed and the fuel-air switching valve is in a position to connect to the first inlet.

[0011] As a further technical solution, the fuel shut-off valve is kept closed, and the medium connected to the regeneration fuel nozzle is unpressurized air.

[0012] As a further technical solution, during regeneration, the fuel shut-off valve is opened, the fuel-air switching valve is switched to a position connecting to the second inlet, the high-pressure air switching valve remains closed, and fuel injection is performed.

[0013] As a further technical solution, after regeneration is completed, the fuel shut-off valve is closed, the fuel-air switching valve is switched to the position of connecting to the first inlet, the high-pressure air shut-off valve is opened, and high-pressure air is used to purge and clean the regenerated fuel nozzle. After the cleaning is completed, the high-pressure air shut-off valve is closed and the other valves remain unchanged.

[0014] In a second aspect, an embodiment of the utility model provides a regeneration fuel nozzle cleaning system, wherein the regeneration fuel nozzle is arranged on an exhaust pipe of a diesel engine, and the regeneration fuel nozzle is located upstream of a DPF.

[0015] As a further technical solution, a heat shield is provided outside the regenerative fuel nozzle.

[0016] The beneficial effects of the above-mentioned embodiments of the utility model are as follows:

[0017] The utility model provides a fuel nozzle cleaning system for regeneration, which utilizes high-pressure air in a high-pressure gas cylinder to clean the regeneration fuel nozzle; realizes the switching between fuel and high-pressure air through a fuel-air switching valve; cleans the nozzle at an appropriate time; and after the regeneration is completed and the nozzle is cleaned, the nozzle cavity is still kept in contact with the air to avoid contact with the fuel again after cleaning and being sintered by high temperature.

[0018] The fuel shut-off valve, high-pressure air shut-off valve and fuel-air switching valve in the utility model are controlled by a controller. The controller determines whether to clean the nozzle according to the regeneration instruction, the engine running time and other information, and cleans the fuel generated on the regeneration fuel nozzle after the regeneration is completed in time, thus solving the problem of clogging of the regeneration fuel nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0020] Figure 1 The utility model is a structural schematic diagram of a fuel nozzle cleaning system for regeneration.

[0021] The schematic diagram is for illustrative purposes only;

[0022] Among them, 1. gas cylinder; 2. high-pressure air shut-off valve; 3. fuel-air switching valve; 301. first inlet; 302. second inlet; 303. outlet; 4. regeneration fuel nozzle; 5. exhaust pipe; 6. air pipe; 7. fuel pipe; 8. fuel shut-off valve; 9. controller. DETAILED DESCRIPTION

[0023] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0024] Example 1

[0025] In a typical implementation of the present invention, Figure 1 As shown, a regeneration fuel nozzle cleaning system is provided, including a gas cylinder 1, a high-pressure air shut-off valve 2 and a fuel-air switching valve 3, wherein the fuel-air switching valve 3 is provided with a first inlet 301, a second inlet 302 and an outlet 303, wherein the first inlet 301 is connected to the high-pressure air shut-off valve via an air pipe 6, and the high-pressure air shut-off valve is connected to the gas cylinder 1 via the air pipe 6; the second inlet 302 is connected to the fuel pipe 7, and the outlet 303 is connected to the regeneration fuel nozzle 4.

[0026] In this embodiment, the fuel-air switching valve 3 is electrically connected to the controller 9, and the air pipe and the fuel pipe are switched through the control of the controller to achieve the connection between the regeneration fuel nozzle 4 and the fuel pipe 7 or the connection between the regeneration fuel nozzle 4 and the air pipe 6, thereby using high-pressure air to clean the nozzle pipe and remove the residual fuel when the regeneration fuel nozzle stops spraying fuel. Further, the controller is a vehicle ECU.

[0027] In this embodiment, a fuel cut-off valve 8 is further provided on the fuel pipe 7. The fuel-air switching valve 8 is provided downstream of the fuel cut-off valve 3. The connection and disconnection of the fuel pipeline are realized by the provided fuel cut-off valve.

[0028] In this embodiment, the gas cylinder 1 is a high-pressure gas cylinder, which contains high-pressure air. The gas cylinder can be a specially configured high-pressure gas cylinder, or a vehicle gas cylinder can be directly used.

[0029] The regeneration fuel nozzle cleaning system provided by the utility model, when not performing regeneration, the high-pressure air shut-off valve 2 remains closed, the fuel-air switching valve 3 is in a position connected to the first inlet 301, and at the same time, the fuel shut-off valve 8 remains closed, and the medium connected to the regeneration nozzle 4 is unpressurized air.

[0030] Furthermore, when regeneration is performed, the fuel shut-off valve 8 is opened, the fuel air shut-off valve 8 is switched to a position connected to the second inlet 302, and the high-pressure air shut-off valve 2 remains closed. At this time, the regeneration fuel nozzle 4 is connected to the fuel pipe 7, and the regeneration fuel nozzle 4 performs fuel injection.

[0031] After regeneration is completed, the fuel shut-off valve 8 is closed, the fuel air shut-off valve 3 is switched to a position connected to the first inlet, the high-pressure air shut-off valve 2 is opened, and the high-pressure air is used to purge and clean the regenerated fuel nozzle 4. After the cleaning is completed, the high-pressure air shut-off valve is closed, and the other valves remain stationary and return to their original state.

[0032] After regeneration is completed and the nozzle is cleaned, the nozzle cavity is still kept in contact with the air to avoid contact with fuel again after cleaning and sintering by high temperature.

[0033] In order to better clean the fuel regeneration nozzle, it can also be cleaned before each regeneration and at fixed intervals, such as every 24 hours. The cleaning method is the same as the above steps, that is, switch the fuel air shut-off valve to the position of connecting the air interface, and open the high-pressure air shut-off valve at the same time.

[0034] The high-pressure air shut-off valve, fuel-air switching valve and fuel shut-off valve used in this embodiment are all existing structures.

[0035] The regeneration fuel nozzle cleaning system provided by the utility model adopts the high-pressure air provided by the whole vehicle to clean the nozzle, which is efficient and does not consume extra energy; the oil pipe is improved, the modification is small and the modification cost is low; the high-pressure air inlet is located above the entire nozzle, which can thoroughly clean the oil cavity inside the nozzle, and at the same time, after cleaning, the nozzle cavity remains in contact with the air, isolating the fuel to ensure the cleaning effect.

[0036] Example 2

[0037] In a typical embodiment of the present invention, a diesel engine is provided, comprising the regeneration fuel nozzle cleaning system described in Example 1, wherein the regeneration fuel nozzle 4 is arranged on the exhaust pipe 5 of the diesel engine, and the regeneration fuel nozzle 4 is located upstream of the DPF.

[0038] In order to further reduce the temperature of the nozzle body and reduce the risk of sintering and clogging of the regeneration fuel nozzle 4, a heat shield is installed on the regeneration fuel nozzle 4 to isolate a portion of the heat of the exhaust pipe 6.

[0039] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A fuel nozzle cleaning system for regeneration, characterized in that: The invention comprises a gas cylinder (1), a high-pressure air shut-off valve (2) and a fuel-air switching valve (3); the fuel-air switching valve (3) is provided with a first inlet (301), a second inlet (302) and an outlet (303); the first inlet (301) is connected to the high-pressure air shut-off valve (2) through an air pipe (6); the high-pressure air shut-off valve (2) is connected to the gas cylinder (1) through an air pipe (6); the second inlet (302) is connected to a fuel pipe (7); the outlet (303) is connected to a regeneration fuel nozzle (4).

2. The regeneration fuel nozzle cleaning system according to claim 1, characterized in that: The fuel-air switching valve (3) is electrically connected to a controller (9), and the connection between the air pipe (6) and the fuel pipe (7) is switched under the control of the controller (9).

3. The regeneration fuel nozzle cleaning system according to claim 1, characterized in that: The fuel pipe (7) is also provided with a fuel cut-off valve (8), and the fuel-air switching valve (3) is arranged downstream of the fuel cut-off valve (8).

4. The regeneration fuel nozzle cleaning system according to claim 1, characterized in that: The gas cylinder (1) is a high-pressure gas cylinder, and the high-pressure gas cylinder contains high-pressure air.

5. The regeneration fuel nozzle cleaning system according to claim 1, characterized in that: When regeneration is not performed, the high-pressure air cut-off valve (2) remains in a closed state, and the fuel-air switching valve (3) is in a position connected to the first inlet (301).

6. The regeneration fuel nozzle cleaning system according to claim 5, characterized in that: The fuel shut-off valve (8) remains closed and the medium connected to the regeneration fuel nozzle (4) is unpressurized air.

7. The regeneration fuel nozzle cleaning system according to claim 1, characterized in that: When regeneration is performed, the fuel shut-off valve (8) is opened, the fuel-air switching valve (3) is switched to a position connecting to the second inlet (302), the high-pressure air shut-off valve (2) remains closed, and fuel injection is performed.

8. The regeneration fuel nozzle cleaning system according to claim 7, characterized in that: After the regeneration is completed, the fuel shut-off valve (8) is closed, the fuel-air switching valve (3) is switched to a position connected to the first inlet (301), the high-pressure air shut-off valve (2) is opened, and the high-pressure air is used to purge and clean the regenerated fuel nozzle (4). After the cleaning is completed, the high-pressure air shut-off valve (2) is closed, and the other valves remain unchanged.

9. A diesel engine, comprising a regeneration fuel nozzle cleaning system as claimed in any one of claims 1 to 8, characterized in that: The regeneration fuel nozzle (4) is arranged on the exhaust pipe (5) of the diesel engine, and the regeneration fuel nozzle (4) is located upstream of the DPF.

10. The diesel engine according to claim 9, characterized in that A heat insulation cover is arranged outside the regeneration fuel nozzle (4).

Images