A diesel engine fuel injection pump

Abstract

The application discloses a diesel engine fuel injection pump and belongs to the technical field of diesel engines. Mainly comprising an oil pump main body, the oil pump main body is provided with an oil return port and an oil inlet port, the oil return port and the oil inlet port cooperatively constitute a fuel passage closed loop, a filtering mechanism is arranged at the inlet end of the oil port, the filtering mechanism is provided with an oil inlet pipe and a guide outlet, a defoaming assembly is arranged between the oil inlet pipe and the guide outlet, a connecting pipe is arranged at one end of the guide outlet, a defoaming cylinder is arranged at the end of the connecting pipe, defoaming holes are formed in the outer side of the defoaming cylinder, and a sealing ring is arranged at the joint of the defoaming cylinder and the connecting pipe. The diesel engine fuel injection pump achieves the effect of eliminating bubbles by arranging the defoaming assembly.

Description

Technical Field

[0001] This application relates to the field of diesel engine technology, specifically to a diesel engine fuel injection pump. Background Technology

[0002] The diesel engine fuel injection pump is the core high-pressure fuel supply device in the diesel engine fuel supply system. Its core function is to pressurize low-pressure fuel to 100-200MPa (300MPa in common rail systems) and deliver atomized fuel to the combustion chamber in a timely and quantitative manner according to the engine's operating conditions.

[0003] For example, patent CN203962261U discloses a diesel engine fuel injection pump. This patent allows the plunger core sleeve to rotate by a certain angle through the flat square inserted in the keyway by rotating the cover screw at a certain angle, thereby increasing or decreasing the flow rate of the oil inlet.

[0004] In actual use, fuel dissolves air under normal pressure. When the pressure in the fuel inlet line fluctuates or the temperature rises, the dissolved gas in the fuel may form bubbles. These bubbles are compressed and deformed under high pressure, occupying the effective volume of the fuel line, which leads to a sharp reduction in the actual fuel injection volume.

[0005] Therefore, it is necessary to provide a diesel engine fuel injection pump to solve the above problems.

[0006] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Summary of the Invention

[0007] Based on the aforementioned problems in the prior art, the problem to be solved by this application is to provide a diesel engine fuel injection pump that solves the problem that when the pressure fluctuates or the temperature rises in the fuel inlet pipe, the dissolved gas in the fuel may form bubbles, resulting in a sharp reduction in the actual fuel injection volume.

[0008] The technical solution adopted by this application to solve its technical problem is: a diesel engine fuel injection pump, comprising:

[0009] The oil pump body has a return port and an inlet port, which together form a closed loop of fuel passage.

[0010] A filter mechanism is installed at the inlet end of the oil inlet, and the filter mechanism has an oil inlet pipe and an outlet.

[0011] A defoaming assembly is installed between the oil inlet pipe and the outlet pipe, the defoaming assembly comprising:

[0012] A connecting pipe, which is installed at one end of the outlet;

[0013] A defoaming cartridge, which is installed at the end of the connecting pipe;

[0014] Defoaming holes are formed on the outside of the defoaming cylinder;

[0015] A sealing ring is installed at the connection between the defoaming cylinder and the connecting pipe.

[0016] Furthermore, the outer wall of the connecting pipe is provided with an external thread, and the inlet end of the oil inlet pipe is provided with an internal thread. The external thread and the internal thread are engaged and connected to each other.

[0017] Furthermore, the outer diameter of the defoaming cylinder is smaller than the inner diameter of the oil inlet pipe.

[0018] Furthermore, the outer wall of the defoaming cylinder and the inner wall of the oil inlet pipe form an annular gap.

[0019] Furthermore, the defoaming holes are configured as angled holes.

[0020] The beneficial effect of this application is that the diesel engine injection pump provided by this application achieves the effect of eliminating air bubbles by setting an anti-foaming component.

[0021] In addition to the purposes, features, and advantages described above, this application has other purposes, features, and advantages. A further detailed description of this application will be provided below with reference to the figures. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0023] Figure 1 This is an overall schematic diagram of a diesel engine fuel injection pump according to this application;

[0024] Figure 2 This is an overall exploded schematic diagram of a diesel engine fuel injection pump according to this application;

[0025] Figure 3 for Figure 2 A schematic diagram of the intermediate filtration mechanism;

[0026] Figure 4 for Figure 2 Exploded cross-sectional view of the intermediate filtration mechanism;

[0027] Figure 5 This is a schematic diagram as shown in Figure A;

[0028] The following are the labeling elements in the figure:

[0029] 1. Oil pump body; 2. Oil return port; 3. Oil inlet; 4. Filtering mechanism; 40. First housing; 41. Outlet; 42. Second housing; 43. Filter chamber; 44. Filter cylinder; 45. Filter slot; 46. Inlet pipe; 47. Filter chamber; 48. Oil inlet pipe; 5. Defoaming component; 50. Connecting pipe; 51. External thread; 52. Sealing ring; 53. Defoaming cylinder; 54. Defoaming hole. Detailed Implementation

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0032] like Figures 1-2 As shown, this application provides a diesel engine fuel injection pump, which is mainly installed in the fuel supply system of a diesel engine and is used to deliver atomized diesel fuel to the high-pressure combustion chamber. Specifically, the diesel engine fuel injection pump includes a pump body 1, and the side wall of the pump body 1 is provided with a return port 2 and an inlet port 3. The inlet port 3 is connected to the fuel supply system through a pipeline to draw in low-pressure fuel. The return port 2 is connected to the high-pressure chamber of the pump and is used to guide excess fuel leaked by the plunger back to the low-pressure system. Thus, the return port 2 and the inlet port 3 work together to form a closed loop of fuel passage. At the same time, external fuel is drawn into the pump chamber through the inlet port 3, pressurized by the plunger, and discharged through the return port 2.

[0033] To remove impurities and particles from fuel, such as Figures 1-4 As shown, a filter mechanism 4 is integrated at the inlet end of the oil inlet 3. The filter mechanism 4 includes an oil inlet pipe 48 that is coaxially fixed with the oil inlet 3. A first housing 40 is fixedly installed at the other end of the oil inlet pipe 48. At the same time, a second housing 42 is coaxially assembled at the other end of the first housing 40 by threads. Thus, the first housing 40 and the second housing 42 are sealed together to form an independent closed cavity. Meanwhile, a filter cylinder 44 is fixedly installed at the center of the inner end face of the second housing 42. A filter slit 45 is opened on the outer side of the filter cylinder 44 to facilitate subsequent filtration operations.

[0034] It should be noted that the filter cartridge 44 is provided with a filter chamber 47 inside, which is used to hold the fuel to be filtered, and a filter cavity 43 is formed between the outer wall of the filter cartridge 44 and the inner wall of the closed cavity, which is used to hold the filtered fuel.

[0035] Meanwhile, an inlet pipe 46 is provided at one end of the second housing 42. One end of the inlet pipe 46 extends through the second housing 42 into the filter chamber 47, and the other end of the inlet pipe 46 is connected to the fuel supply system so that fuel can be introduced into the filter chamber 47 for subsequent filtration. When the fuel enters the filter chamber 47, it can be filtered through the filter slit 45.

[0036] When fuel passes radially through the filter slit 45, particles larger than the slit width are blocked in the filter chamber 47, and clean fuel enters the filter chamber 43. At the same time, an outlet 41 is provided on one side of the first housing 40. The outlet 41 is connected to the oil inlet pipe 48 and is also connected to the filter chamber 43, so that the filtered fuel can be introduced into the oil inlet pipe 48 through the outlet 41, and then the fuel is introduced into the oil pump body 1 through the oil inlet 3.

[0037] In order to eliminate air bubbles in fuel, such as Figures 4-5 As shown, a defoaming component 5 is provided between the outlet 41 and the inlet pipe 48. The defoaming component 5 includes a connecting pipe 50 fixedly installed at one end of the outlet 41. The connecting pipe 50 has an external thread 51 on its outer wall and an internal thread (not shown in the figure) at the inlet end of the inlet pipe 48. The two are screwed together to communicate with each other so as to facilitate the subsequent delivery of fuel.

[0038] Meanwhile, a defoaming cylinder 53 is coaxially provided at the end of the connecting pipe 50, and the outer diameter of the defoaming cylinder 53 is smaller than the inner diameter of the oil inlet pipe 48, so that after the defoaming cylinder 53 is screwed into the oil inlet pipe 48, an annular gap can be formed between the two.

[0039] Furthermore, multiple sets of defoaming holes 54 are evenly distributed on the cylinder wall of the defoaming cylinder 53. These defoaming holes 54 are set at an angle so that the fuel can pass through the defoaming holes 54 for defoaming operations.

[0040] Meanwhile, in order to increase the sealing performance, a sealing ring 52 is nested at the connection between the connecting pipe 50 and the defoaming cylinder 53. When the external thread 51 is screwed into the oil inlet pipe 48, the sealing ring 52 is axially compressed and undergoes radial deformation, which tightly fits the inner wall of the oil inlet pipe 48 to form a double sealing barrier.

[0041] When fuel flows into the connecting pipe 50 from the outlet 41, it first fills the inner cavity of the defoaming cylinder 53, and then accelerates through the defoaming hole 54. When the high-speed oil flow is sprayed into the annular space of the oil inlet pipe 48 from the defoaming hole 54 set by the inclined hole, the surface of the bubble is torn by shear force and impacts the inner wall of the oil inlet pipe 48, thereby achieving the effect of eliminating bubbles.

[0042] The fuel that has finally defoamed flows along the annular gap to the inlet 3 and is then introduced into the fuel pump body 1.

[0043] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A diesel engine fuel injection pump, characterized in that: include: The oil pump body (1) has an oil return port (2) and an oil inlet (3), and the oil return port (2) and the oil inlet (3) together form a closed loop of fuel passage; The filter mechanism (4) is installed at the inlet end of the oil inlet (3) and has an oil inlet pipe (48) and an outlet (41). A defoaming assembly (5) is installed between the oil inlet pipe (48) and the outlet (41), the defoaming assembly (5) comprising: A connecting pipe (50) is installed at one end of the outlet (41); Defoaming cartridge (53), which is installed at the end of the connecting pipe (50); Defoaming hole (54), which is opened on the outside of the defoaming cylinder (53); A sealing ring (52) is installed at the connection between the defoaming cylinder (53) and the connecting pipe (50).

2. A diesel engine fuel injection pump according to claim 1, characterized in that: The outer wall of the connecting pipe (50) is provided with an external thread (51), and the inlet end of the oil inlet pipe (48) is provided with an internal thread. The external thread (51) and the internal thread are screwed together and connected to each other.

3. A diesel engine fuel injection pump according to claim 1, characterized in that: The outer diameter of the defoaming cylinder (53) is smaller than the inner diameter of the oil inlet pipe (48).

4. A diesel engine fuel injection pump according to claim 1, characterized in that: The outer wall of the defoaming cylinder (53) and the inner wall of the oil inlet pipe (48) form an annular gap.

5. A diesel engine fuel injection pump according to claim 1, characterized in that: The defoaming hole (54) is set as an oblique hole.

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