Electric fuel delivery pump assembly of diesel engine

Abstract

The invention relates to the technical field of fluid machinery, and discloses a diesel engine electric oil delivery pump assembly which comprises an oil delivery pump assembly, an oil delivery hole is fixedly connected to the interior of the oil delivery pump assembly, a degassing mechanism is in threaded connection to the interior of the oil delivery hole, and a filtering mechanism is clamped to the outer surface of the degassing mechanism. A first threaded column and a spiral flow deflector are arranged, when fuel oil flows through the separator, the flow deflector guides the fuel oil to flow spirally, air is exhausted through an exhaust pipe by means of centrifugal force to achieve oil-gas separation, and the first threaded column can be rotated to pull the flow deflector to adjust the screw pitch and optimize the separation effect. The guide rod limits the flow deflector during adjustment to ensure that the flow deflector is vertical, and the part extending out of the separator assists in operation; the limiting sleeve fixes the angle between the flow deflector and the exhaust pipe and prevents the flow deflector from rotating to interfere fuel oil flowing and destroy stability; the circular clamping plate is matched with the arc-shaped filter plate and the filter element to secondarily filter fuel oil, and air and impurities are intercepted to relieve the cavitation effect.

Description

Technical Field

[0001] This invention relates to the field of fluid machinery technology, specifically to an electric fuel pump assembly for a diesel engine. Background Technology

[0002] Traditional fuel pumps for diesel engines mostly use mechanical drive, which depends on engine speed. This can lead to problems such as unstable fuel supply pressure and difficulty starting in low-temperature environments. They are also difficult to adapt to the needs of high emission standards and high-efficiency engines. As engine technology continues to upgrade, the requirements for the accuracy, stability and energy efficiency of the fuel supply system are gradually increasing. Traditional fuel pumps also have limitations such as high fuel consumption and poor emission control.

[0003] Patent application CN201621253598.6 discloses an electric fuel pump assembly for a diesel engine, including a hand pump, a pump body, and a filter cartridge. A fuel return valve is located below the hand pump, and a return spring is fitted around the outside of the return valve. One end of the return spring has a sealing ring. The return valve is fitted with both the return spring and the sealing ring. The return spring is threadedly connected to the hand pump. A flange below the return valve is connected to the pump body. A speed control plug is located on one side of the pump body.

[0004] However, this patent also has the following shortcomings: the diesel engine electric fuel pump assembly generates cavitation effect. Due to the mixing of fuel with air, turbulent flow forms local low pressure, unstable flow trajectory generates eddies, and impurities hinder flow. Cavitation will cause fuel to generate bubbles, which will disrupt the continuity of fuel supply, aggravate the wear of internal pump components, generate abnormal noise, and shorten the service life of the fuel pump. In view of this situation, a diesel engine electric fuel pump assembly is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide an electric fuel pump assembly for a diesel engine to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a diesel engine electric fuel pump assembly, comprising a fuel pump assembly, wherein a fuel delivery port is fixedly connected inside the fuel pump assembly, a degassing mechanism is threadedly connected inside the fuel delivery port, and a filter mechanism is snapped onto the outer surface of the degassing mechanism, wherein the degassing mechanism includes:

[0007] A circular base has a threaded post connected internally. A rotating rubber sleeve and a circular plate are rotatably connected to the outer surface of the threaded post. A spiral guide vane is fixedly connected to the upper surface of the circular plate. A second circular plate is fixedly connected to the upper surface of the spiral guide vane. A limit sleeve is fixedly connected to the upper surface of the second circular plate. An exhaust pipe is fixedly connected to the outer surface of the limit sleeve. An arc-shaped clamping plate is snapped into the inside of the threaded post. A bellows is fixedly connected to the upper surface of the rotating rubber sleeve. The bellows protects the threaded post.

[0008] When fuel flows through the separator, the spiral guide vanes guide the fuel to flow in a spiral pattern, and air is discharged through the exhaust pipe under the action of centrifugal force, thus achieving fuel-air separation.

[0009] According to the above technical solution, the degassing mechanism also includes an external threaded sleeve, which is threadedly connected to the oil delivery hole. A separator is threadedly connected inside the external threaded sleeve. The separator has an outlet end and an inlet end inside. A spiral guide rib is fixedly connected inside the outlet end. An anti-vortex cover is fixedly connected to the outer surface of the spiral guide rib. The spiral guide rib is used to avoid the generation of vortices by direct impact of oil delivery.

[0010] According to the above technical solution, the degassing mechanism also includes an exhaust valve, which is fixedly connected to the inside of the exhaust pipe. A guide rod is rotatably connected inside the circular plate, and a rotating rubber sleeve is rotatably connected to the outer surface of the guide rod. The guide rod is used to guide the spiral guide vane.

[0011] According to the above technical solution, the outer surface of the spiral guide rib is fixedly connected to the inner wall of the outlet end, the outer surface of the anti-vortex cover is fixedly connected to the interior of the outlet end, the outer surface of the anti-vortex cover is flush with the outer surface of the outlet end, and the anti-vortex cover is used to prevent the formation of vortices when the oil delivery hole sucks in oil.

[0012] According to the above technical solution, the circular base is snapped into the separator, the threaded column one is rotatably connected to the circular base, the rotating rubber sleeve one is rotatably connected to the separator, the upper surface of the circular plate two is in contact with the inner wall of the separator, the limiting sleeve is snapped into the interior of the separator, the exhaust pipe is in contact with the inner wall of the spiral guide vane, and the exhaust pipe is used to exhaust the oil.

[0013] According to the above technical solution, the first rotating rubber sleeve is rotatably connected to the circular base, the arc-shaped clamping plate is clamped to the separator, the upper surface of the first corrugated pipe is fixedly connected to the lower surface of the first threaded column, the exhaust valve is clamped to the limiting sleeve, the second rotating rubber sleeve is rotatably connected to the separator, the first circular plate is clamped to the exhaust pipe, and the first threaded column is used to adjust the spiral guide vane.

[0014] According to the above technical solution, the filtration mechanism further includes a filter box, which is snapped into the inlet end. A circular clamping plate is snapped into the inside of the filter box, and a nut assembly is threaded onto the outer surface of the circular clamping plate. An internally threaded rotating sleeve is rotatably connected inside the filter box, and a threaded post II is threaded onto the inner thread of the internally threaded rotating sleeve. A corrugated pipe II is fixedly connected to the inner wall of the filter box, and an arc-shaped filter plate is fixedly connected to the lower surface of the threaded post II. A filter element is snapped into the inside of the filter box, and an inlet pipe is snapped into the outer surface of the filter box. A U-shaped base is fixedly connected to the lower surface of the filter box, and the corrugated pipe II is used to protect the threaded post II.

[0015] According to the above technical solution, the lower surface of the second corrugated pipe is fixedly connected to the upper surface of the arc-shaped filter plate, the lower surface of the arc-shaped filter plate is in contact with the upper surface of the filter element, and the internal thread rotating sleeve is used to adjust the height of the second threaded column.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. This type of diesel engine electric fuel pump assembly, by setting a threaded column, when fuel flows through the separator, the spiral guide vane guides the fuel spiral flow, and the air is discharged through the exhaust pipe under the action of centrifugal force, thus realizing oil-gas separation. At this time, rotating the threaded column can pull the spiral guide vane, adjust its pitch, and thus change the angle and distance of guiding the fuel spiral flow, thereby improving the oil-gas separation effect.

[0018] 2. This type of diesel engine electric fuel pump assembly, by setting a guide rod, can restrict the spiral guide vanes when the pitch of the screw column is adjusted, ensuring that they remain in a vertical state. At the same time, the part of the guide rod that extends out of the separator can assist the operator in adjusting the pitch of the spiral guide vanes.

[0019] 3. This type of diesel engine electric fuel pump assembly, by setting a limiting sleeve, can fix the angle between the spiral guide vane and the exhaust pipe during the process of the spiral guide vane guiding the fuel spiral flow, so as to prevent the spiral guide vane from interfering with the fuel flow trajectory due to its own rotation when guiding the fuel spiral flow, and avoid damaging the stability of the fuel spiral flow.

[0020] 4. This type of diesel engine electric fuel pump assembly, by setting a circular clamping plate, can effectively intercept air and impurities mixed in the fuel during the secondary filtration of fuel by the arc-shaped filter plate and filter element, thus avoiding these substances from aggravating the cavitation effect during the fuel transfer process; and the filter element can be replaced through the circular clamping plate. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0022] Figure 2 This is a cross-sectional view of the main body of the invention;

[0023] Figure 3 This is a cross-sectional view of the degassing mechanism of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of the threaded post one of the present invention;

[0025] Figure 5 This is a schematic diagram of the exhaust pipe structure of the present invention;

[0026] Figure 6 for Figure 3 Enlarged cross-sectional view of the structure at point A in the middle;

[0027] Figure 7 This is a cross-sectional view of the filtering mechanism of the present invention;

[0028] Figure 8 for Figure 7 Enlarged cross-sectional view of the structure at point B.

[0029] In the diagram: 1. Oil pump assembly; 2. Oil inlet; 3. Degassing mechanism; 31. External threaded sleeve; 32. Separator; 321. Outlet end; 322. Inlet end; 323. Spiral guide rib; 324. Anti-vortex cover; 33. Circular base; 331. Threaded post one; 332. Rotating rubber sleeve one; 333. Circular plate one; 334. Spiral guide vane; 335. Circular plate two; 336. Limiting sleeve; 33 7. Exhaust pipe; 338. Arc-shaped clamping plate; 339. Corrugated pipe one; 34. Exhaust valve; 35. Guide rod; 36. Rotating rubber sleeve two; 4. Filtering mechanism; 41. Filter box; 411. Round clamping plate; 412. Nut assembly; 413. Internal thread rotating sleeve; 414. Threaded column two; 415. Corrugated pipe two; 416. Arc-shaped filter plate; 417. Filter element; 42. Inlet pipe; 43. U-shaped base. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0031] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0032] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] Example 1: See Figures 1-6 The present invention provides a technical solution: an electric fuel pump assembly for a diesel engine, comprising a fuel pump assembly 1, an internal fuel inlet 2 fixedly connected to the fuel pump assembly 1, a degassing mechanism 3 threadedly connected to the internal fuel inlet 2, and a filter mechanism 4 snapped onto the outer surface of the degassing mechanism 3, the degassing mechanism 3 comprising:

[0034] A circular base 33 has a threaded post 331 internally connected to it. A rotating rubber sleeve 332 and a circular plate 333 are rotatably connected to the outer surface of the threaded post 331. A spiral guide vane 334 is fixedly connected to the upper surface of the circular plate 333. A circular plate 335 is fixedly connected to the upper surface of the spiral guide vane 334. A limit sleeve 336 is fixedly connected to the upper surface of the circular plate 335. An exhaust pipe 337 is fixedly connected to the outer surface of the limit sleeve 336. An arc-shaped clamping plate 338 is snapped into the inside of the threaded post 331. A bellows 339 is fixedly connected to the upper surface of the rotating rubber sleeve 332. The bellows 339 is used to protect the threaded post 331.

[0035] When fuel flows through separator 32, spiral guide vane 334 guides the fuel to flow in a spiral pattern, and air is discharged through exhaust pipe 337 under the action of centrifugal force, thus achieving oil-gas separation.

[0036] The degassing mechanism 3 also includes an external threaded sleeve 31, which is threadedly connected to the oil delivery hole 2. A separator 32 is threadedly connected inside the external threaded sleeve 31. The separator 32 has an outlet end 321 and an inlet end 322 inside. A spiral guide rib 323 is fixedly connected inside the outlet end 321. An anti-vortex cover 324 is fixedly connected to the outer surface of the spiral guide rib 323. The spiral guide rib 323 is used to avoid the generation of vortices by direct impact of oil delivery.

[0037] The degassing mechanism 3 also includes an exhaust valve 34, which is fixedly connected to the inside of the exhaust pipe 337. A guide rod 35 is rotatably connected inside the circular plate 333, and a rotating rubber sleeve 36 is rotatably connected to the outer surface of the guide rod 35. The guide rod 35 is used to guide the spiral guide vane 334.

[0038] The outer surface of the spiral guide rib 323 is fixedly connected to the inner wall of the outlet end 321, the outer surface of the anti-vortex cover 324 is fixedly connected to the interior of the outlet end 321, and the outer surface of the anti-vortex cover 324 is flush with the outer surface of the outlet end 321. The anti-vortex cover 324 is used to prevent the formation of vortices when the oil supply hole 2 sucks in oil.

[0039] The circular base 33 is snapped into the separator 32, the threaded column 331 is rotatably connected to the circular base 33, the rotating rubber sleeve 332 is rotatably connected to the separator 32, the upper surface of the circular plate 335 is in contact with the inner wall of the separator 32, the limiting sleeve 336 is snapped into the inside of the separator 32, and the exhaust pipe 337 is in contact with the inner wall of the spiral guide vane 334. The exhaust pipe 337 is used to exhaust the oil.

[0040] Rotary rubber sleeve 332 is rotatably connected to circular base 33, arc-shaped clamping plate 338 is clamped to separator 32, upper surface of bellows 339 is fixedly connected to lower surface of threaded column 331, exhaust valve 34 is clamped to limit sleeve 336, rotating rubber sleeve 36 is rotatably connected to separator 32, circular plate 333 is clamped to exhaust pipe 337, threaded column 331 is used to adjust spiral guide vane 334. When threaded column 331 adjusts the height of circular plate 333, bellows 339 is stretched to protect threaded column 331, and guide rod 35 slides inside rotating rubber sleeve 36 to seal the sliding between guide rod 35 and separator 32.

[0041] When fuel flows through separator 32, spiral guide vane 334 guides the fuel to flow in a spiral. Air is discharged through exhaust pipe 337 under the action of centrifugal force. During the separation of oil and gas, local low-pressure areas are formed due to the turbulent flow of different fuels, which leads to cavitation. Therefore, degassing mechanism 3 is needed to adjust spiral guide vane 334.

[0042] The working principle of this embodiment is as follows: When using this type of diesel engine electric fuel pump assembly, fuel is introduced through the inlet end 322 and enters the interior of the separator 32 tangentially. At this time, the spiral guide vane 334 guides the fuel to flow spirally. Air is discharged through the exhaust pipe 337 under the action of centrifugal force and is discharged in one direction through the exhaust valve 34 to achieve oil-gas separation. The fuel enters the interior of the spiral guide rib 323 through the outlet end 321. After being degassed by the separator 32, the fuel enters the flow stabilizing chamber and slowly rotates along the spiral guide rib 323. Centrifugal force is used to further stabilize the flow velocity and avoid direct impact to generate eddies. The fuel is then guided into the interior of the fuel pump assembly 1 through the fuel inlet 2 by the anti-vortex cover 324. The anti-vortex cover 324 prevents the formation of vortices when the fuel inlet 2 sucks in fuel. When performing oil-gas separation on different fuels, the threaded column 331 is rotated and the circular plate 333 is pushed upward through the threaded connection with the circular base 33. The movement of the spiral guide vane 334 compresses the spiral guide vane 334, shortening its pitch and changing the angle and speed of the fuel spiral flow. Simultaneously, the limiting sleeve 336 restricts the spiral guide vane 334 and exhaust pipe 337, preventing them from rotating during fuel spiral flow. This prevents the spiral guide vane from interfering with the fuel flow trajectory due to rotation. As the circular plate 333 moves upward, it pushes the guide rod 35 upward, keeping the spiral guide vane 334 vertical. The guide rod 35 extends beyond the separator 32. The operator assists in adjusting the pitch of the spiral guide vane 334. After adjusting the spiral guide vane 334 with the threaded post 331, the arc-shaped clamping plate 338 is engaged with the circular plate 333, and the arc-shaped clamping plate 338 is fixed to the circular base 33 through the through hole, keeping the separator 32 vertical.

[0043] Example 2: Please refer to Figures 7-8 Based on Embodiment 1, the present invention provides a technical solution: the filtration mechanism 4 further includes a filter box 41, which is snapped into the inlet end 322. A circular clamping plate 411 is snapped into the inside of the filter box 41, and a nut assembly 412 is threadedly connected to the outer surface of the circular clamping plate 411. An internally threaded rotating sleeve 413 is rotatably connected inside the filter box 41, and a threaded post 414 is threadedly connected to the inner thread of the internally threaded rotating sleeve 413. A corrugated pipe 415 is fixedly connected to the inner wall of the filter box 41, and an arc-shaped filter plate 416 is fixedly connected to the lower surface of the threaded post 414. A filter element 417 is snapped into the inside of the filter box 41, and an inlet pipe 42 is snapped into the outer surface of the filter box 41. A U-shaped base 43 is fixedly connected to the lower surface of the filter box 41, and the corrugated pipe 415 is used to protect the threaded post 414.

[0044] The lower surface of the second bellows 415 is fixedly connected to the upper surface of the arc-shaped filter plate 416. The lower surface of the arc-shaped filter plate 416 is in contact with the upper surface of the filter element 417. The internal threaded rotating sleeve 413 is used to adjust the height of the second threaded column 414. When the fuel is filtered through the filter element 417, the density of the filter element 417 is lower than that of the fuel, so that the filter element 417 floats inside the fuel and maintains more sufficient contact with the fuel.

[0045] When fuel is fed into the separator 32, impurities and gases contained in the fuel will enter the separator 32, causing cavitation bubbles to be generated. Therefore, the filter mechanism 4 is required to filter the incoming fuel to remove impurities and gases.

[0046] The working principle of this embodiment is as follows: When using this type of diesel engine electric fuel pump assembly, before the fuel enters the separator 32, it is introduced into the filter box 41 through the inlet pipe 42 and then into the separator 32. The fuel undergoes secondary filtration through the filter element 417 and the arc-shaped filter plate 416. At this time, by rotating the internal threaded rotating sleeve 413 and connecting it with the threaded post 414, the threaded post 414 moves upward, causing the arc-shaped filter plate 416 to move upward, thereby positioning the arc-shaped filter plate 416 in the middle of the filter box 41. At this time, the filter element 417 floats inside the fuel, causing the upper surface of the filter element 417 to contact the lower surface of the arc-shaped filter plate 416, thereby making the filter element 417... By maintaining more sufficient contact with the fuel and reducing dead zones in the filtration, impurities and air inside the fuel are filtered out, thus preventing impurities from obstructing fuel flow and causing local throttling and pressure reduction. Air promotes the generation of cavitation bubbles and intensifies the cavitation effect. When the filtration effect of the filter element 417 decreases, the internal threaded rotating sleeve 413 is rotated in the opposite direction to drive the threaded column 414 downward, which in turn squeezes the filter element 417 through the arc-shaped filter plate 416, so that the filter element 417 contacts the lower surface of the inner wall of the filter box 41. At this time, the threaded connection of the nut assembly 412 is released and the round clamping plate 411 is removed, thereby replacing the filter element 417 and assisting in cleaning the arc-shaped filter plate 416, thus ensuring the dual filtration effect of the arc-shaped filter plate 416 and the filter element 417.

[0047] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0048] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A diesel engine electric fuel pump assembly, comprising a fuel pump assembly (1), wherein a fuel delivery port (2) is fixedly connected inside the fuel pump assembly (1), a degassing mechanism (3) is threadedly connected inside the fuel delivery port (2), and a filter mechanism (4) is snapped onto the outer surface of the degassing mechanism (3), characterized in that, The degassing mechanism (3) includes: A circular base (33) has a threaded post (331) internally connected to the circular base (33). A rotating rubber sleeve (332) and a circular plate (333) are rotatably connected to the outer surface of the threaded post (331). A spiral guide vane (334) is fixedly connected to the upper surface of the circular plate (333). A circular plate (335) is fixedly connected to the upper surface of the spiral guide vane (334). A limit sleeve (336) is fixedly connected to the upper surface of the circular plate (335). An exhaust pipe (337) is fixedly connected to the outer surface of the limit sleeve (336). An arc-shaped clamping plate (338) is snapped into the inside of the threaded post (331). A corrugated pipe (339) is fixedly connected to the upper surface of the rotating rubber sleeve (332). The corrugated pipe (339) is used to protect the threaded post (331). When fuel flows through the separator (32), the spiral guide vane (334) guides the fuel to flow in a spiral manner, and the air is discharged through the exhaust pipe (337) under the action of centrifugal force, thus realizing the separation of oil and gas.

2. The diesel engine electric fuel pump assembly according to claim 1, characterized in that: The degassing mechanism (3) also includes an external threaded sleeve (31), which is threadedly connected to the oil delivery hole (2). The internal thread of the external threaded sleeve (31) is connected to a separator (32). The separator (32) has an outlet end (321) and an inlet end (322) inside. The outlet end (321) is fixedly connected to a spiral guide rib (323), and the outer surface of the spiral guide rib (323) is fixedly connected to an anti-vortex cover (324). The spiral guide rib (323) is used to avoid the direct impact of oil delivery to generate vortices.

3. The diesel engine electric fuel pump assembly according to claim 2, characterized in that: The degassing mechanism (3) also includes an exhaust valve (34), which is fixedly connected to the inside of the exhaust pipe (337). A guide rod (35) is rotatably connected inside the circular plate (333), and a rotating rubber sleeve (36) is rotatably connected to the outer surface of the guide rod (35). The guide rod (35) is used to guide the spiral guide vane (334).

4. The diesel engine electric fuel pump assembly according to claim 3, characterized in that: The outer surface of the spiral guide rib (323) is fixedly connected to the inner wall of the outlet end (321), the outer surface of the anti-vortex cover (324) is fixedly connected to the interior of the outlet end (321), the outer surface of the anti-vortex cover (324) is flush with the outer surface of the outlet end (321), and the anti-vortex cover (324) is used to prevent the formation of vortices when the oil delivery hole (2) sucks in oil.

5. The diesel engine electric fuel pump assembly according to claim 4, characterized in that: The circular base (33) is snapped into the separator (32), the threaded column one (331) is rotatably connected to the circular base (33), the rotating rubber sleeve one (332) is rotatably connected to the separator (32), the upper surface of the circular plate two (335) is in contact with the inner wall of the separator (32), the limiting sleeve (336) is snapped into the inside of the separator (32), the exhaust pipe (337) is in contact with the inner wall of the spiral guide vane (334), and the exhaust pipe (337) is used to exhaust the oil.

6. The diesel engine electric fuel pump assembly according to claim 5, characterized in that: The rotating rubber sleeve one (332) is rotatably connected to the circular base (33), the arc-shaped clamping plate (338) is clamped to the separator (32), the upper surface of the corrugated pipe one (339) is fixedly connected to the lower surface of the threaded column one (331), the exhaust valve (34) is clamped to the limiting sleeve (336), the rotating rubber sleeve two (36) is rotatably connected to the separator (32), the circular plate one (333) is clamped to the exhaust pipe (337), and the threaded column one (331) is used to adjust the spiral guide vane (334).

7. The diesel engine electric fuel pump assembly according to claim 3, characterized in that: The filtration mechanism (4) further includes a filter box (41), which is snapped into the inlet end (322). A circular retaining plate (411) is snapped into the inside of the filter box (41). A nut assembly (412) is threaded onto the outer surface of the circular retaining plate (411). An internally threaded rotating sleeve (413) is rotatably connected inside the filter box (41). A threaded post (414) is threaded into the internally threaded rotating sleeve (413). The inner wall of the cleaning box (41) is fixedly connected with a corrugated pipe (415), the lower surface of the threaded column (414) is fixedly connected with an arc-shaped filter plate (416), the inside of the filter box (41) is fitted with a filter element (417), the outer surface of the filter box (41) is fitted with an inlet pipe (42), the lower surface of the filter box (41) is fixedly connected with a U-shaped base (43), and the corrugated pipe (415) is used to protect the threaded column (414).

8. The diesel engine electric fuel pump assembly according to claim 7, characterized in that: The lower surface of the second corrugated pipe (415) is fixedly connected to the upper surface of the arc-shaped filter plate (416), the lower surface of the arc-shaped filter plate (416) is in contact with the upper surface of the filter element (417), and the internal thread rotating sleeve (413) is used to adjust the height of the second threaded column (414).

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