Electric fuel pump for diesel engine

Abstract

The electric fuel pump for the diesel engine comprises a fuel pump body, a base is detachably arranged at the bottom of the fuel pump body, a supporting assembly is fixedly arranged on the base, a plurality of fixing blocks are fixedly arranged on the base in the circumferential direction of the base, guide grooves are formed in the fixing blocks, and a plurality of guide blocks are fixedly arranged on the bottom face of the fuel pump body in the circumferential direction of the fuel pump body. A plurality of vertical plates are fixedly arranged on the base in the circumferential direction of the base, sliding rods are arranged on the vertical plates in a sliding mode, clamping plates are fixedly arranged at one ends of the sliding rods, the sliding rods are fixedly sleeved with circular plates, first springs are fixedly arranged between the circular plates and the vertical plates, and limiting assemblies for limiting the sliding rods are arranged on the vertical plates. The base is provided with the transmission assembly for releasing limiting of the sliding rod through the limiting assembly, the guide block is inserted into the guide groove, meanwhile, the clamping plate is driven to fix the fuel pump body, operation steps are saved, and the efficiency of installing the fuel pump body is improved.

Description

Technical Field

[0001] The invention relates to the technical field of fuel pumps, in particular to an electric fuel pump for a diesel engine. Background Art

[0002] An electric fuel pump is usually a mechatronic component consisting of a micro motor connected to a micro oil pump and encapsulated in a casing and auxiliary parts. It is used in gasoline or diesel engine fuel systems and can continuously suck fuel from the fuel tank and deliver it to the fuel supply pipe, thereby supplying fuel to the engine.

[0003] For example, the patent document with the publication number of "CN112628039B" and the name of "An Intelligent Electric Fuel Pump with Electronic Pressure Regulator" includes a fuel pump body, a support seat and a support plate. The top of the fuel pump body is equipped with an oil delivery pipe, the outer surface of the fuel pump body is equipped with a fixing ring by bolts, the front of the fuel pump body is equipped with a pressure discharge pipe, and the pressure discharge pipe is located below the fixing ring. The bottom of the fuel pump body is embedded with a support seat, the top of the support seat is welded with a support plate, and the support plate is located outside the fuel pump body. The support plate is penetrated and installed inside the support plate. The bottom of the fuel pump body is equipped with an oil inlet pipe, and the bottom of the oil inlet pipe is equipped with a fuel filter box. The top and bottom movable rods are moved by pulling the handle to place the fuel pump body on the limit groove, and then the handle is released, the reset spring supports the top piece to drive the movable rod to move forward, and the movable rod moves forward to drive the card plate to stick to the outer surface of the fuel pump body to fix the fuel pump body.

[0004] However, in the process of installing the fuel pump body in the above document, it is first necessary to pull the handles outward to drive the movable rod to move, then place the fuel pump body on the limit groove, and finally release the handles to make the clamping plate fit on the outer surface of the fuel pump body, which makes the steps of installing the fuel pump body more complicated, time-consuming and labor-intensive, and reduces the efficiency of installing the fuel pump body. Summary of the invention

[0005] The purpose of the present invention is to address the deficiencies of the prior art and propose an electric fuel pump for a diesel engine to solve the technical problems mentioned in the background art that the steps for installing the fuel pump body are complicated, time-consuming, labor-intensive, and the installation efficiency is low.

[0006] To achieve the above object, the present invention adopts the following technical solutions: The electric fuel pump for a diesel engine comprises a fuel pump body, wherein the bottom of the fuel pump body is detachably provided with a base, a supporting assembly is fixedly provided on the base, a plurality of fixing blocks are fixedly provided on the base along its circumference, a guide groove is provided on the fixing block, a plurality of guide blocks are fixedly provided on the bottom surface of the fuel pump body along its circumference, the guide blocks are adapted to the guide grooves, a plurality of vertical plates are fixedly provided on the base along its circumference, a sliding rod is slidably provided on the vertical plate, a clamping plate is fixedly provided at one end of the sliding rod, a circular plate is fixedly sleeved on the sliding rod, a first spring is fixedly provided between the circular plate and the vertical plate, a limiting assembly for limiting the sliding rod is provided on the vertical plate, and a transmission assembly for releasing the limiting of the sliding rod through the limiting assembly is provided on the base. When the guide block is engaged with the guide groove, the guide block drives the limiting assembly to release the limiting of the sliding rod through the transmission assembly, and the sliding rod moves toward the direction of the fuel pump body under the action of the first spring reset force, and the sliding rod drives the clamping plate to fit to the outer side of the fuel pump body to fix the fuel pump body.

[0007] Working principle: When fixing the fuel pump body, aim the guide block at the corresponding guide groove and insert the guide block into the corresponding guide groove. During this process, the guide block drives the driving rod to move downward, and the driving rod drives the limiting rod to move downward through the connecting rod. The limiting rod moves downward out of the limiting hole to release the limit on the sliding rod. Under the action of the first spring reset force, the sliding rod drives the card plate to fit the outer surface of the fuel pump body, thereby fixing the fuel pump body.

[0008] The beneficial effects of the present invention are as follows: since a sliding rod is slidably arranged on the vertical plate, a cardboard is fixedly arranged at one end of the sliding rod, a circular plate is fixedly sleeved on the sliding rod, a first spring is fixedly arranged between the circular plate and the vertical plate, a limiting assembly for limiting the sliding rod is arranged on the vertical plate, and a transmission assembly for releasing the limiting of the sliding rod through the limiting assembly is arranged on the base, when fixing the fuel pump body, the guide block is aimed at the corresponding guide groove, so that the guide block is inserted into the corresponding guide groove. In this process, the guide block drives the driving rod to move downward, and the driving rod drives the limiting rod to move downward through the connecting rod, and the limiting rod is disengaged from the limiting hole downward to release the limiting of the sliding rod. The sliding rod drives the cardboard to fit the outer surface of the fuel pump body under the action of the first spring reset force, thereby fixing the fuel pump body. By inserting the guide block into the guide groove and driving the cardboard to fix the fuel pump body at the same time, there is no need to manually pull the sliding rod outward to drive the cardboard to move, which saves operation steps and improves the efficiency of installing the fuel pump body.

[0009] Furthermore, the limit assembly includes a limit rod, which is slidably arranged inside the vertical plate, and a limit hole is opened on the sliding rod. One end of the limit rod is adapted to and slidably cooperates with the limit hole, and the other end of the limit rod is connected to the transmission assembly. A cavity is opened in the vertical plate, and a sliding plate is fixedly sleeved on the limit rod. The sliding plate is slidably connected to the cavity, and a second spring is fixedly arranged between the sliding plate and the cavity.

[0010] Furthermore, the transmission assembly includes a driving rod, which is slidably set on the base, one end of the driving rod is abutted against the guide block, and the other end of the driving rod is fixedly provided with a connecting rod, and the other end of the connecting rod is fixedly connected to the corresponding limit rod.

[0011] Furthermore, a plurality of round rods are fixedly provided on the bottom surface of the fuel pump body along its circumference, and the round rods are fixedly connected to the corresponding guide blocks. The guide blocks are arc-shaped, and a fixing plate is fixedly provided on the top of the fixing block. The fixing plate cooperates with the guide groove to form a limiting cavity for limiting the guide block. The end of the driving rod is located in the limiting cavity, and an inclined surface is provided at the end of the driving rod located in the limiting cavity, and the guide block and the inclined surface of the end of the driving rod are slidably matched.

[0012] Furthermore, a fixing ring is provided on the fixed sleeve of the fuel pump body, and a plurality of arranging rings are provided on the fixing ring along its circumference, the arranging ring includes a first half ring, one end of the first half ring is hingedly provided with a second half ring through a hinge shaft, and the other end of the second half ring is connected to the first half ring through a first bolt.

[0013] Furthermore, a sliding groove is provided on the outer side of the fixing ring along its circumference, and a plurality of sliding blocks are slidably arranged in the sliding groove, and the sliding blocks are connected to the corresponding sorting rings. An annular plate is also fixedly provided on the outer side of the fixing ring, and a plurality of through holes are provided on the annular plate along its circumference, and a second bolt is threadedly connected to the sliding block, and the second bolt passes through the corresponding through hole.

[0014] Furthermore, a receiving groove is provided in the slider, a baffle is slidably arranged in the receiving groove, a third spring is fixedly arranged between one side of the baffle and the slider, a moving rod is fixedly arranged on the other side of the baffle, and the moving rod is fixedly connected to the sorting ring.

[0015] Furthermore, an oil outlet pipe is arranged on the top of the fuel pump body, a one-way valve is arranged on the oil outlet pipe, an oil inlet pipe is arranged on the bottom of the fuel pump, and a through hole is opened at the center of the base, and the through hole allows the oil inlet pipe to pass through.

[0016] Furthermore, a pressure relief pipe is provided on the fuel pump body, and a pressure relief valve is provided on the pressure relief pipe.

[0017] Furthermore, the support assembly includes a support plate, which is fixedly arranged on the base, a support rod is fixedly arranged on one side of the support plate, and a mounting plate is fixedly arranged on the other end of the support rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A perspective view of the present invention; Figure 2 A three-dimensional diagram in which the supporting components are hidden for the present invention; Figure 3 It is a cross-sectional view of the limiting assembly and the transmission assembly of the present invention; Figure 4 A three-dimensional diagram of the base of the present invention; Figure 5 is a three-dimensional diagram of a fixing ring of the present invention; Figure 6 For the present invention Figure 6 A magnified image of point A; Figure 7 It is a cross-sectional view of the fixing ring and the sliding block of the present invention.

[0019] Description of the accompanying drawings: 1. fuel pump body; 2. oil outlet pipe; 3. one-way valve; 4. pressure relief pipe; 5. pressure relief valve; 6. support plate; 601. support rod; 602. mounting plate; 7. fixing ring; 701. slide groove; 702. slider; 703. second bolt; 704. moving rod; 705. first half ring; 706. second half ring; 707. first bolt; 708. receiving groove; 709. baffle; 710. third spring ;8. Vertical plate;9. Base;901. Through hole;10. Fixed block;11. Sleeve;12. Sliding rod;13. Card plate;14. Oil inlet pipe;15. Round rod;16. Connecting rod;17. Round plate;18. First spring;19. Limit hole;20. Limit rod;21. Sliding plate;22. Second spring;23. Driving rod;24. Fixed plate;25. Guide block;26. Guide groove;27. Annular plate;28. Through hole. DETAILED DESCRIPTION

[0020] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0021] like Figure 1-Figure 7As shown, an electric fuel pump for a diesel engine includes a fuel pump body 1, a base 9 is detachably mounted at the bottom of the fuel pump body 1, an oil outlet pipe 2 is mounted on the top of the fuel pump body 1, and the fuel is delivered through the oil outlet pipe 2. A one-way valve 3 is mounted on the oil outlet pipe 2 to prevent the fuel from flowing back and affecting the fuel delivery of the fuel pump body 1, while ensuring the smooth start of the vehicle. An oil inlet pipe 14 is mounted at the bottom of the fuel pump, and a through hole 901 is opened at the center of the base 9, and the through hole 901 allows the oil inlet pipe 14 to pass through. After the fuel pump body 1 is mounted on the base 9, the oil inlet pipe 14 extends to the bottom of the base 9 through the through hole 901 on the base 9, and a filter screen (not shown in the figure) can be mounted on the oil inlet pipe 14 to filter impurities in the fuel and improve the quality of the fuel. A pressure relief pipe 4 is mounted on the top of the fuel pump body 1, and a pressure relief valve 5 is mounted on the pressure relief pipe 4. In the process of the fuel pump body 1 delivering fuel, it is convenient to relieve the pressure inside the fuel pump body 1, thereby ensuring the normal operation of the fuel pump body 1. A support assembly is fixedly mounted on the base 9, and the base 9 is circular. The support assembly includes three support plates 6, the bottoms of the three support plates 6 are respectively fixedly mounted with the edges of the top of the base 9, and the three support plates 6 are arranged in an array along the circumference of the base 9. Two symmetrically arranged support rods 601 are fixedly mounted on one side of the support plate 6, and a mounting plate 602 is fixedly mounted on the other end of the support rod 601.

[0022] Three fixing blocks 10 are fixedly installed on the top of the base 9 along its circumference. The three fixing blocks 10 are arranged in an array along the circumference of the upper surface of the base 9. A guide groove 26 is provided in the fixing blocks 10. Three round rods 15 are fixedly installed on the bottom surface of the fuel pump body 1 along its circumference. A guide block 25 is fixedly installed at the bottom end of the round rod 15. The guide block 25 corresponds to the guide groove 26 one by one, and the guide block 25 is adapted to the guide groove 26. Both the guide groove 26 and the guide block 25 are arc-shaped. When the fuel pump body 1 is rotated, it is convenient for the fuel pump body 1 to drive the guide block 25 to slide along the guide groove 26.

[0023] The base 9 is fixedly installed with three vertical plates 8 along its circumference, and the three vertical plates 8 are arranged in an array along the circumference of the base 9. A sliding rod 12 is slidably installed on the top of the vertical plate 8. A through groove adapted to the sliding rod 12 is opened on the top of the vertical plate 8. The sliding rod 12 is slidably penetrated in the through groove and is perpendicular to the vertical plate 8. A clamping plate 13 is fixedly installed on one end of the sliding rod 12 close to the fuel pump body 1. The clamping plate 13 is arc-shaped, which is convenient for increasing the fit between the clamping plate 13 and the outer surface of the fuel pump body 1. A non-slip pad is fixedly bonded to one side of the clamping plate 13 close to the fuel pump body 1. The protective pad is made of rubber and is used to increase the friction between the clamping plate 13 and the fuel pump body 1 to prevent the fuel pump body 1 from sliding or rotating relative to the clamping plate 13. The sliding rod 12 is a rectangular parallelepiped structure to prevent the sliding rod 12 from driving the clamping plate 13 to rotate. A handle is fixedly installed on one end of the sliding rod 12 away from the clamping plate 13 to facilitate pulling the limit rod 20 outward.

[0024] A sleeve 11 is fixedly installed on the side of the vertical plate 8 away from the fuel pump body 1. The sleeve 11 is sleeved on the outer periphery of the sliding rod 12. A circular plate 17 is slidably installed in the sleeve 11. The circular plate 17 is fixedly sleeved on the outer periphery of the sliding rod 12. A first spring 18 is fixedly installed between the circular plate 17 and the vertical plate 8. The first spring 18 is sleeved on the outer periphery of the sliding rod 12. One end of the first spring 18 is fixedly connected to the circular plate 17, and the other end of the first spring 18 is fixedly connected to the vertical plate 8. The first spring 18 is always in a stretched state. The sleeve 11 is provided to guide the circular plate 17 when it moves. A limit assembly for limiting the sliding rod 12 is installed on the vertical plate 8. The limit assembly includes a limit rod 20. The limit rod 20 is slidably installed inside the vertical plate 8. A mounting groove is provided inside the vertical plate 8 along the direction in which the vertical plate 8 extends in length. The top of the mounting groove is connected to the through groove at the top of the vertical plate 8, and the bottom of the mounting groove is connected to the outside of the vertical plate 8. The limit rod 20 is slidably penetrated in the mounting groove of the vertical plate 8. A limit hole 19 is provided on the sliding rod 12. The top of the limit rod 20 is adapted and slidably matched with the limit hole 19. A cavity is provided inside the vertical plate 8 along the direction in which the vertical plate 8 extends in length. The cavity is connected to the mounting groove, and the radial length of the cavity is greater than the radial length of the mounting groove. A sliding plate 21 is fixedly sleeved on the outer periphery of the limiting rod 20, and the sliding plate 21 is slidably connected to the cavity. A second spring 22 is fixedly installed between the sliding plate 21 and the cavity. The second spring 22 is sleeved on the outer periphery of the limiting rod 20, one end of the second spring 22 is fixedly connected to the sliding plate 21, and the other end of the second spring 22 is fixedly connected to the bottom surface of the cavity.

[0025] The base 9 is provided with a transmission assembly for releasing the limit of the sliding rod 12 through the limit assembly, and the transmission assembly includes a driving rod 23, which is vertically penetrated on the base 9 and slidably mounted with the base 9, and the top end of the driving rod 23 extends into the corresponding guide groove 26 and abuts against the corresponding guide block 25. The bottom end of the driving rod 23 extends to the bottom of the base 9 and is fixedly mounted with a connecting rod 16, and the other end of the connecting rod 16 is fixedly mounted with the bottom end of the corresponding limit rod 20.

[0026] A fixing plate 24 is fixedly installed on one side of the top of the fixing block 10, and the fixing plate 24 cooperates with the guide groove 26 to form a limiting cavity for limiting the guide block 25. The end of the driving rod 23 is located in the limiting cavity, and the end of the driving rod 23 located in the limiting cavity is provided with an inclined surface. When the guide block 25 slides along the guide groove 26, it slides with the inclined surface of the end of the driving rod 23, thereby driving the driving rod 23 to move downward. By providing the limiting cavity, the guide block 25 can be limited, preventing the fuel pump body 1 from being separated from the guide groove 26 during a long period of vibration, causing the fuel pump body 1 to be separated from the base 9, which brings safety hazards.

[0027] When the guide block 25 is fitted into the guide groove 26, the guide block 25 drives the limiting assembly through the transmission assembly to release the limiting of the sliding rod 12. The sliding rod 12 moves toward the direction of the fuel pump body 1 under the action of the restoring force of the first spring 18. The sliding rod 12 drives the clamping plate 13 to fit the outer surface of the fuel pump body 1 to fix the fuel pump body 1.

[0028] It should be noted that when the limit rod 20 is inserted into the limit hole 19, the length of the limit rod 20 inserted in the limit hole 19 is equal to the length of the end of the drive rod 23 in the limit cavity, and the side of the end of the drive rod 23 away from the inclined surface is in contact with the side wall of the limit cavity relative to its opening, thereby ensuring that the guide block 25 enters the limit cavity and is in contact with the side wall of the limit cavity relative to its opening. At the same time, the guide block 25 and the inclined surface of the end of the drive rod 23 slide together to drive the drive rod 23 to move downward, and the drive rod 23 drives the limit rod 20 to disengage from the limit hole 19 at the same time to release the limit on the sliding rod 12, thereby ensuring that the fuel pump body 1 is installed in place. At the same time, the sliding rod 12 drives the clamping plate 13 to fit onto the outer surface of the fuel pump body 1 under the action of the reset force of the first spring 18, thereby reminding the operator that the fuel pump body 1 has been installed in place.

[0029] The outer circumference of the fuel pump body 1 is fixedly sleeved with a fixing ring 7, and a sliding groove 701 is provided on the outer side of the fixing ring 7 along its circumference. A plurality of sliders 702 are slidably installed in the sliding groove 701, and the cross section of the sliding groove 701 is "T"-shaped to prevent the sliders 702 from escaping from the sliding groove 701. A receiving groove 708 is provided on the inner edge of the slider 702, and a baffle 709 is slidably installed in the receiving groove 708. A third spring 710 is fixedly installed between one side of the baffle 709 and the slider 702, and a moving rod 704 is fixedly installed on the other side of the baffle 709. The moving rod 704 extends to the outside of the slider 702 and is fixedly installed with a finishing ring. The finishing ring includes a first half ring 705, and the first half ring 705 is fixedly installed with the moving rod 704. One end of the first half ring 705 is hingedly installed with a second half ring 706 through a hinge shaft, and the other end of the second half ring 706 is connected to the first half ring 705 through a first bolt 707. By installing the tidying ring, the pipeline for oil delivery and the wiring harness of the fuel pump body 1 can be tidied to prevent the pipeline and wiring harness from being too scattered, making it convenient for the operator to tidy them up. An annular plate 27 is also fixedly installed on the outer side of the fixing ring 7. The annular plate 27 is provided with a plurality of through holes 28 along its circumference. The slider 702 is threadedly connected with a second bolt 703, and the second bolt 703 passes through the corresponding through holes 28.

[0030] In the prior art, when arranging the oil pipeline, the arranging ring cannot ensure that it is in the same straight line as the direction of the oil pipeline, which can easily cause the oil pipeline to bend or even bend. Therefore, according to the actual installation situation, the second bolt 703 is removed to release the restriction on the slider 702, and then the slider 702 is moved to slide along the slide groove 701. The slider 702 drives the arranging ring to move to a suitable position, and then the second bolt 703 is passed through the corresponding perforation 28 on the annular plate 27 and threadedly connected with the slider 702 to fix the position of the slider 702. This prevents the oil pipeline from being bent and affects the smoothness of fuel delivery, thereby avoiding affecting the safe driving of the vehicle. By setting the third spring 710, the moving rod 704 and the arranging ring are buffered, so as to avoid resonance between the oil pipeline and the wiring harness and the fuel pump body 1 during the driving of the vehicle, thereby increasing noise.

[0031] Working principle: When in use, the device is fixed inside the car through the mounting plate 602, the mounting plate 602 supports the supporting plate 6 through the supporting rod 601, and the supporting plate 6 supports the base 9. This mounting method is a prior art and will not be described in detail. For the specific mounting method, reference may be made to the patent document with the document number CN112628039B. This ensures the stability of the base 9 and facilitates the guide block 25 to be embedded in the guide groove 26.

[0032] When fixing the fuel pump body 1, aim the guide block 25 at the corresponding guide groove 26, insert the guide block 25 into the corresponding guide groove 26, and then rotate the fuel pump body 1, the fuel pump body 1 drives the guide block 25 to rotate, the guide block 25 rotates and moves along the guide groove 26 and enters the limiting cavity, and limits the guide block 25. In this process, the guide block 25 and the end inclined surface of the driving rod 23 located in the limiting cavity are slidably matched, thereby driving the driving rod 23 to move downward, and the driving rod 23 drives the limiting rod 20 to move downward through the connecting rod 16. When the guide block 25 is in contact with the side wall of the limiting cavity relative to its opening, the fuel pump body 1 can no longer rotate, ensuring that the fuel pump body 1 is installed in place, and the limiting rod 20 is separated from the limiting hole 19 at the same time to release the limit of the sliding rod 12. The sliding rod 12 drives the card plate 13 to fit on the outer surface of the fuel pump body 1 under the action of the reset force of the first spring 18, thereby fixing the fuel pump body 1 and reminding the operator that the fuel pump body 1 has been installed in place.

[0033] The limiting rod 20 moves downward and drives the sliding plate 21 to move along the cavity, compressing the second spring 22, so as to facilitate the disassembly of the fuel pump body 1. After the fuel pump body 1 is disassembled, the sliding rod 12 is pulled outward, and the limiting rod 20 is driven to be reinserted into the limiting hole 19 under the restoring force of the second spring 22.

[0034] Then, it is connected to the external delivery device through the oil inlet pipe 14, and connected to the external oil delivery pipe through the oil outlet pipe 2, so as to facilitate the delivery of fuel to the engine. After starting the fuel pump body 1, the fuel is filtered through the filter screen in the oil inlet pipe 14 and then delivered to the inside of the fuel pump body 1. Then, the fuel pump body 1 delivers the fuel to the diesel engine through the oil outlet pipe 2 and the external oil delivery pipe. During the fuel delivery process, when the pressure in the fuel pump body 1 exceeds the safety value, the pressure relief valve 5 is controlled to open to discharge the pressure in the fuel pump body 1 to ensure the normal use of the fuel pump body 1.

[0035] Finally, the wiring harness and the oil pipeline can be arranged through the arranging ring, the first bolt 707 is screwed, the second half ring 706 is opened, the corresponding wiring harness or oil pipeline is placed in the first half ring 705, the second half ring 706 is docked with the first half ring 705, and the first bolt 707 is threadedly connected with the first half ring 705, and the wiring harness or oil pipeline is fixed. Avoid the pipelines and wiring harnesses being too messy, and facilitate the operator to arrange.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An electric fuel pump for a diesel engine, comprising a fuel pump body (1), characterized in that: The bottom of the fuel pump body (1) is detachably provided with a base (9), a support assembly is fixedly provided on the base (9), a plurality of fixed blocks (10) are fixedly provided on the base (9) along its circumference, a guide groove (26) is provided on the fixed block (10), a plurality of guide blocks (25) are fixedly provided on the bottom surface of the fuel pump body (1) along its circumference, the guide blocks (25) are matched with the guide groove (26), a plurality of vertical plates (8) are fixedly provided on the base (9) along its circumference, a sliding rod (12) is slidably provided on the vertical plate (8), a clamping plate (13) is fixedly provided at one end of the sliding rod (12), a circular plate (17) is fixedly sleeved on the sliding rod (12), and the circular plate (17) is fixedly sleeved on the sliding rod (12). A first spring (18) is fixedly arranged between the guide block (25) and the vertical plate (8), a limiting assembly for limiting the sliding rod (12) is arranged on the vertical plate (8), and a transmission assembly for releasing the limiting of the sliding rod (12) through the limiting assembly is arranged on the base (9). When the guide block (25) is engaged with the guide groove (26), the guide block (25) drives the limiting assembly to release the limiting of the sliding rod (12) through the transmission assembly. The sliding rod (12) moves toward the direction of the fuel pump body (1) under the action of the restoring force of the first spring (18), and the sliding rod (12) drives the clamping plate (13) to fit the outer side of the fuel pump body (1) to fix the fuel pump body (1).

2. The electric fuel pump for a diesel engine according to claim 1, characterized in that: The limiting assembly comprises a limiting rod (20), the limiting rod (20) being slidably arranged inside the vertical plate (8), a limiting hole (19) being provided on the sliding rod (12), one end of the limiting rod (20) being adapted to and slidably fitted in the limiting hole (19), the other end of the limiting rod (20) being connected to the transmission assembly, a cavity being provided inside the vertical plate (8), a sliding plate (21) being fixedly sleeved on the limiting rod (20), the sliding plate (21) being slidably connected to the cavity, and a second spring (22) being fixedly arranged between the sliding plate (21) and the cavity.

3. The electric fuel pump for a diesel engine according to claim 2, characterized in that: The transmission assembly comprises a driving rod (23), the driving rod (23) being slidably disposed on the base (9), one end of the driving rod (23) being in abutment with the guide block (25), the other end of the driving rod (23) being fixedly disposed with a connecting rod (16), the other end of the connecting rod (16) being fixedly connected to a corresponding limiting rod (20).

4. The electric fuel pump for a diesel engine according to claim 3, characterized in that: The bottom surface of the fuel pump body (1) is fixedly provided with a plurality of round rods (15) along its circumference, the round rods (15) are fixedly connected to corresponding guide blocks (25), the guide blocks (25) are arc-shaped, a fixing plate (24) is fixedly provided on the top of the fixing block (10), the fixing plate (24) cooperates with the guide groove (26) to form a limiting cavity for limiting the guide block (25), the end of the driving rod (23) is located in the limiting cavity, and an inclined surface is provided at the end of the driving rod (23) located in the limiting cavity, and the guide block (25) is slidably matched with the inclined surface at the end of the driving rod (23).

5. The electric fuel pump for a diesel engine according to claim 1, characterized in that: A fixing ring (7) is fixedly sleeved on the fuel pump body (1), and a plurality of arranging rings are arranged on the fixing ring (7) along its circumference, the arranging ring comprising a first half ring (705), one end of the first half ring (705) being hingedly provided with a second half ring (706) via a hinge shaft, and the other end of the second half ring (706) being connected to the first half ring (705) via a first bolt (707).

6. The electric fuel pump for a diesel engine according to claim 5, characterized in that: The outer side of the fixing ring (7) is provided with a slide groove (701) along its circumference, and a plurality of sliders (702) are slidably arranged in the slide groove (701), and the sliders (702) are connected to corresponding sorting rings. An annular plate (27) is also fixedly arranged on the outer side of the fixing ring (7), and a plurality of through holes (28) are provided on the annular plate (27) along its circumference. A second bolt (703) is threadedly connected to the slider (702), and the second bolt (703) passes through the corresponding through holes (28).

7. The electric fuel pump for a diesel engine according to claim 6, characterized in that: The slider (702) is provided with a receiving groove (708), a baffle (709) is slidably arranged in the receiving groove (708), a third spring (710) is fixedly arranged between one side of the baffle (709) and the slider (702), a moving rod (704) is fixedly arranged on the other side of the baffle (709), and the moving rod (704) is fixedly connected to the sorting ring.

8. The electric fuel pump for a diesel engine according to claim 1, characterized in that: The top of the fuel pump body (1) is provided with an oil outlet pipe (2), the oil outlet pipe (2) is provided with a one-way valve (3), the bottom of the fuel pump is provided with an oil inlet pipe (14), and the center of the base (9) is provided with a through hole (901), and the through hole (901) allows the oil inlet pipe (14) to pass through.

9. The electric fuel pump for a diesel engine according to claim 1, characterized in that: The fuel pump body (1) is provided with a pressure relief pipe (4), and the pressure relief pipe (4) is provided with a pressure relief valve (5).

10. The electric fuel pump for a diesel engine according to claim 1, characterized in that: The support assembly comprises a support plate (6), the support plate (6) being fixedly arranged on a base (9), a support rod (601) being fixedly arranged on one side of the support plate (6), and a mounting plate (602) being fixedly arranged on the other end of the support rod (601).

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