Electric fuel pump assembly

Abstract

The invention discloses an electric fuel pump assembly, and relates to the technical field of fuel pumps, in particular to an electric fuel pump assembly which comprises an oil pool and a pump body arranged in the oil pool, a motor is arranged in the pump body, an oil inlet cylinder is arranged at the bottom end of the pump body, and a filter screen is fixedly connected to the middle of the inner wall of the oil inlet cylinder. According to the electric fuel pump assembly, a backflushing cavity is periodically communicated with a first communication channel (the backflushing cavity is aligned with the first communication channel to achieve fuel supplement when a rotating plate rotates), and a linkage compression structure of a sliding ejector block, a driving plate and a driven plate is matched; and in combination with an elastic constraint and release mechanism of the limiting ball, a part of liquid flow can be converted into intermittent pulse high-energy jet flow while the basic cleaning function of the back-flushing liquid flow is maintained, and the stripping effect on adhered impurities on the surface of the filter screen and the disturbance effect on particles in pores are enhanced through concentrated release of kinetic energy and high-frequency pressure fluctuation.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel pumps, and more particularly to an electric fuel pump assembly. Background Art

[0002] As the core component of the fuel supply system of an electronic fuel injection engine, the electric fuel pump continuously pumps fuel from the fuel tank to provide the fuel system with fuel at a specified pressure and flow rate. As the "power source" of the fuel supply system, the performance of the electric fuel pump is directly related to the operating efficiency and stability of the engine. In the fuel supply system, electric fuel pumps are primarily arranged in two configurations: externally mounted fuel pumps are connected in series to the fuel line outside the fuel tank; internally mounted fuel pumps are installed within the fuel tank and submerged in the gasoline. The internally mounted design is currently more widely used due to its significant advantages, including superior heat dissipation, low operating noise, and long service life.

[0003] For example, the electric fuel pump assembly with application number 202220927943.9 uses a roller pump structure design, which effectively improves the problem of engine starting difficulty. It is particularly suitable for fuel supply systems with poor fluidity, such as diesel. Even in low-temperature environments, the pump can still maintain good pumping performance and ignition speed. However, its fuel filtration system has inherent defects: during long-term use, impurities in the fuel will gradually form a layer of accumulation on the surface of the filter, and tiny particles will easily embed into the pores of the filter, causing the effective filtration area of ​​the filter to continue to decrease. This progressive blockage will significantly increase the fuel suction resistance, forcing the pump body to maintain flow by increasing suction, which in turn causes a series of problems such as increased motor load and increased energy consumption. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides an electric fuel pump assembly that solves the problems raised in the above background technology.

[0005] The technical solutions of the present invention are as follows: To achieve the above objectives, the present invention is implemented through the following technical solutions: an electric fuel pump assembly, comprising an oil pool and a pump body disposed therein, wherein a motor is disposed within the pump body, an oil inlet cylinder is disposed at the bottom end of the pump body, a filter screen is fixedly connected to the middle portion of the inner wall of the oil inlet cylinder, and a drive shaft is rotatably connected to the center of the filter screen, the top end of the drive shaft is fixedly connected to the motor shaft, and the bottom end of the drive shaft is fixedly connected to a filter barrel capable of scraping and collecting impurities attached to the lower surface of the filter screen, a partition plate is disposed at the bottom of the pump body, an oil inlet cavity plate is disposed on the partition plate, and a suction component capable of promoting the pumping of fuel into the pump body is disposed within the oil inlet cavity plate; The suction component includes a rotating plate that can rotate synchronously with the drive shaft. The outer peripheral surface of the rotating plate is embedded with a roller that can be thrown outward by centrifugal force and whose surface can abut against the inner wall of the oil inlet cavity plate. The rotating plate is provided with multiple recoil components, one end of which can always abut against the roller. The recoil components can flush the oil in the oil pool onto the filter screen.

[0006] Preferably, a notch is provided at the top of one side of the filter barrel, the top of the other side of the filter barrel is in contact with the filter net, and a roller is rotatably connected to the notch, the end of the filter barrel away from the drive shaft is attached to the inner wall of the oil inlet barrel, and the side of the filter barrel away from the drive shaft is fixedly connected to a limit block that is integrally slidably connected to the oil inlet barrel.

[0007] Preferably, a plurality of first limit grooves are evenly opened on the outer peripheral surface of the rotating plate, the roller is slidingly arranged in the first limit groove, the bottom end of the drive shaft passes through the oil inlet cavity plate and the rotating plate, and the rotating plate and the drive shaft are fixedly connected, and the upper and lower surfaces of the rotating plate are tightly fitted on the inner top surface and inner bottom surface of the oil inlet cavity plate respectively.

[0008] Preferably, the recoil component includes a plurality of recoil cavities evenly opened on the inner circumferential surface of the rotating plate, the bottom end of the driving shaft is fixedly mounted with a recoil cavity plate whose lower surface opening is tightly attached to the upper surface of the filter screen, the side of the recoil cavity away from the driving shaft is connected with a sliding top block having one end extending into the corresponding first limiting groove, and both circumferential sides of the sliding top block are provided with pushing components that can move synchronously with the sliding top block, and both circumferential sides of the recoil cavity are provided with a plurality of limiting telescopic components that can block the pushing components.

[0009] Preferably, the oil inlet cavity plate is embedded in the partition plate, so that the oil inlet cylinder and the pump body can be separated by the oil inlet cavity plate and the partition plate. A plurality of first connecting channels are provided in a part of the inner bottom surface of the oil inlet cavity plate, and the setting of the first connecting channels can facilitate the communication between the oil inlet cavity plate and the oil inlet cylinder.

[0010] Preferably, a third connecting channel is opened inside the driving shaft, and second connecting channels that can promote the communication between the recoil cavity and the third connecting channel are penetrated at positions corresponding to the outer circumference of the driving shaft and the multiple recoil cavities, and a second one-way valve with an outlet end facing the third connecting channel is provided in each second connecting channel, and a first one-way valve with one end entering the recoil cavity plate is penetrated at the bottom end of the third connecting channel.

[0011] Preferably, the pushing component includes a driven plate slidably connected to both sides of the sliding top block in the circumferential direction, the driven plate is fixedly connected to a second spring on the side away from the driving shaft, the second spring is fixedly connected to a driving plate at one end away from the driven plate, one end of the driving plate is fixedly connected to the sliding top block, and the other end of the driving plate is in contact with the side of the recoil cavity, and a pressure relief component is provided in the sliding top block.

[0012] Preferably, the limiting telescopic component includes a first limiting groove opened on the side of the recoil cavity, a limiting ball with one end that can be exposed is slidably connected in the first limiting groove, and one end of the limiting ball is fixedly connected to a first spring with one end fixedly set on the side of the first limiting groove.

[0013] Preferably, the pressure relief component includes a pressure relief chamber opened in the sliding top block, a pressure relief push plate is slidably connected to the pressure relief chamber, and the side of the pressure relief push plate close to the drive shaft is fixedly connected to a third spring with one end fixedly set on one side of the pressure relief chamber, and the side of the drive plate close to the drive shaft is provided with a fourth connecting channel connected to the pressure relief chamber.

[0014] Preferably, the driving plate, the driven plate and the sliding top block can form a compression space in the recoil cavity, and the arrangement of the fourth connecting channel can facilitate communication between the compression space and the pressure relief cavity.

[0015] Beneficial effects The present invention provides an electric fuel pump assembly, which has the following beneficial effects: 1. This electric fuel pump assembly, through the periodic connection between the recoil cavity and the first connecting channel (the recoil cavity and the first connecting channel align when the rotating plate rotates to enable fuel replenishment), cooperates with the linked compression structure of the sliding top block, driving plate, and driven plate, and combines the elastic constraint and release mechanism of the limiting ball. While maintaining the basic cleaning function of the recoil fluid flow, it can also convert part of the fluid flow into an intermittent pulsed high-energy jet. Through the concentrated release of kinetic energy and high-frequency pressure fluctuations, it enhances the removal of impurities adhering to the filter surface and the disturbance of particles in the pores.

[0016] 2. The electric fuel pump assembly utilizes a dynamic pressure storage structure consisting of a pressure relief chamber, a pressure relief push plate, and a fourth connecting channel. Combined with mechanical scraping at the edge of the filter barrel, this balances pressure fluctuations during recoil flow compression, preventing component movement jams. This collaborative cleaning cycle of "pulse flow stripping - mechanical structure collection" effectively resolves the kinetic energy dispersion issue associated with continuous recoil, improving the filter's self-cleaning efficiency and the system's long-term reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a structural schematic diagram of the pump body of the present invention; Figure 3 It is a partial cross-sectional structural schematic diagram of the oil inlet cylinder of the present invention when viewed from the front; Figure 4 For the present invention Figure 3 A schematic diagram of the structure enlarged in the middle; Figure 5 It is a schematic diagram of the cross-sectional structure of the pump body of the present invention when viewed from above; Figure 6 For the present invention Figure 5 A schematic diagram of the structure enlarged in the middle; Figure 7 It is a schematic diagram of the partial cross-sectional structure of the pump body of the present invention when viewed from the front.

[0018] In the figure: 1. Oil pool; 2. Pump body; 3. Oil inlet cylinder; 4. Filter screen; 5. Drive shaft; 6. Recoil cavity plate; 7. Filter barrel; 8. First one-way valve; 9. Oil inlet cavity plate; 10. Rotating plate; 11. Roller; 12. Sliding top block; 13. Limiting ball; 14. Second connecting channel; 15. First limiting groove; 16. Second one-way valve; 17. Partition plate; 18. First connecting channel; 19. Drive plate; 20. Recoil cavity; 21. First spring; 22. Driven plate; 23. Second spring; 24. Third connecting channel; 25. Pressure relief push plate; 26. Pressure relief chamber; 27. Third spring; 28. Fourth connecting channel. DETAILED DESCRIPTION

[0019] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0020] Example 1 The existing fuel filtration system has the problem of filter clogging caused by impurity accumulation on the filter surface and retention of tiny particles in the pores. During long-term use, impurities in the fuel will gradually form a layer of accumulation on the filter surface. At the same time, tiny particles are easily embedded in the pores of the filter, resulting in a continuous decrease in the effective filtration area of ​​the filter. This progressive clogging will significantly increase the fuel suction resistance, requiring the pump body to have greater suction force to maintain flow, directly leading to increased motor load and increased energy consumption. Existing electric fuel pump assemblies generally rely solely on contact mechanical scraping, which can only remove large loose particles on the lower surface of the filter and lacks an effective means of removing tiny particles tightly embedded in the pores. As use increases, the increase in inlet vacuum caused by filter clogging will cause the filtration efficiency to gradually decrease. When the clogging degree exceeds a critical value, not only will the fuel supply be unstable, but system failures may also occur due to problems such as motor overheating and component wear, seriously affecting the long-term reliable operation of the fuel pump assembly. This embodiment is specially invented to solve the above problems.

[0021] See also Figures 1 to 7 The present invention provides a technical solution: an electric fuel pump assembly, including an oil pool 1 and a pump body 2 arranged therein, wherein the electric fuel pump assembly belongs to the prior art, and this patent document only elaborates on the improved part, and a motor is arranged in the pump body 2, wherein the working principle of the pump body 2 is the same as that of the application number 202220927943.9 The working principle of the electric fuel pump assembly is the same and will not be elaborated in detail here. An oil inlet cylinder 3 is provided at the bottom end of the pump body 2, and a filter screen 4 is fixedly connected to the middle part of the inner wall of the oil inlet cylinder 3. Through the setting of the filter screen 4, impurities in the fuel can be filtered out, and the center of the filter screen 4 is rotatably connected to the drive shaft 5. The top of the drive shaft 5 is fixedly connected to the motor shaft. Therefore, when the motor is running, its output power drives the drive shaft 5 to rotate. And since the drive shaft 5 and the filter screen 4 adopt a rotatable connection structure, the rotation of the drive shaft 5 will not interfere with the fixed state of the filter screen 4, thereby ensuring the stable realization of the fuel filtering function, and the bottom end of the drive shaft 5 is fixedly connected with a filter barrel 7 that can scrape and collect impurities attached to the lower surface of the filter screen 4. A partition plate 17 is provided at the bottom of the pump body 2, and an oil inlet cavity plate 9 is provided on the partition plate 17. A suction component that can promote the fuel to be drawn into its pump body 2 is provided in the oil inlet cavity plate 9; The pumping component includes a rotating plate 10 that can rotate synchronously with the drive shaft 5. The outer peripheral surface of the rotating plate 10 is embedded with rollers 11 that can be thrown outward by centrifugal force and whose surfaces can abut against the inner wall of the oil inlet cavity plate 9. The rotating plate 10 is connected to the oil inlet cavity plate 9 through the eccentric rotation of the drive shaft 5. The rotating plate 10 is provided with a plurality of recoil components, one end of which can always abut against the rollers 11. The recoil components can recoil the fuel in the oil pool 1 onto the filter 4. The outer peripheral surface of the oil inlet cavity plate 9 is respectively provided with an oil inlet and an oil outlet. The oil inlet is connected to the oil inlet cylinder 3, and the oil outlet is connected to the pump body 2. When the drive shaft 5 drives the rotating plate 10 to rotate eccentrically, the rollers 11 embedded in the outer circumference of the rotating plate 10 are thrown out by the centrifugal force, and their outer surfaces always tightly contact the inner wall of the oil inlet cavity plate 9, thereby forming multiple independent sealed cavities between the rotating plate 10, the rollers 11 and the inner wall of the oil inlet cavity plate 9. As the rotating plate 10 rotates along the eccentric trajectory, when the sealed cavity moves away from the central axis of the drive shaft 5, it is in the oil suction area, the cavity volume gradually expands, and a negative pressure is formed inside, and fuel is sucked into the cavity from the oil inlet. When the sealed cavity moves toward the central axis of the drive shaft 5, it enters the oil discharge area, the cavity volume gradually decreases due to the rollers 11 being constrained by the inner wall of the oil inlet cavity plate 9, and the fuel in the cavity is squeezed and discharged into the subsequent oil circuit through the oil outlet. During the entire process, the roller 11 always maintains dynamic sealing contact with the inner wall under the combined action of centrifugal force and the reaction force of the inner wall of the oil inlet cavity plate 9, ensuring that the fuel is continuously sucked in and discharged in the volume change caused by eccentric rotation. This working process is the same as the working principle of the existing fuel roller pump, so it will not be elaborated on again. See also Figures 3 and 4 , a notch is provided at the top of one side of the filter barrel 7, and the top of the other side of the filter barrel 7 is in contact with the filter screen 4, and a roller is rotatably connected to the notch, wherein the roller is made of rubber, and its outer circumference is tightly fitted with the edge of the notch through elastic deformation, forming a dynamic sealing structure. Specifically, the outer circumference of the roller is tightly fitted with the edge of the notch through its own elastic deformation, and forms a line contact seal with the corresponding inner walls of the filter screen 4 and the filter barrel 7, thereby always maintaining a reliable sealing state of the notch during the rotation process, and the end of the filter barrel 7 away from the drive shaft 5 is fitted on the inner wall of the oil inlet cylinder 3, and the side of the filter barrel 7 away from the drive shaft 5 is fixedly connected to a limit block that is integrally slidably connected to the oil inlet cylinder 3; The lower surface of the filter screen 4 is provided with dense, ring-shaped spike-like protrusions at the edges near the two ends of the roller. The protrusion structure enables the roller 11 to form contact and rolling friction with the protrusions when it rotates with the filter barrel 7, thereby preventing the roller from scraping the surface of the filter screen 4. When the side of the top of the filter barrel 7 without a notch rotates along the surface of the filter screen 4, its edge scrapes the impurities on the lower surface of the filter screen 4, and the scraped impurities immediately fall into the interior of the filter barrel 7 for collection.

[0022] See also Figures 5 to 7 A plurality of first limiting grooves 15 are evenly opened on the outer circumference of the rotating plate 10, and the roller 11 is slidably arranged in the first limiting groove 15. The bottom end of the drive shaft 5 passes through the oil inlet cavity plate 9 and the rotating plate 10, and the rotating plate 10 and the drive shaft 5 are fixedly connected, and the drive shaft 5 and the oil inlet cavity plate 9 are rotatably connected, and the upper and lower surfaces of the rotating plate 10 are tightly fitted on the inner top surface and inner bottom surface of the oil inlet cavity plate 9 respectively.

[0023] See also Figures 5 to 7 , the recoil component includes a plurality of recoil cavities 20 evenly opened on the inner circumferential surface of the rotating plate 10, wherein the upper surface and the lower surface of the recoil cavity 20 are respectively the upper surface and the lower surface of the oil inlet cavity plate 9, so that a closed recoil cavity 20 can be formed by the rotating plate 10, the oil inlet cavity plate 9 and the drive shaft 5. The bottom end of the drive shaft 5 is fixedly mounted with a recoil cavity plate 6 whose lower surface opening is tightly attached to the upper surface of the filter screen 4, wherein the recoil cavity plate 6 corresponds to the upper and lower positions of the filter barrel 7, and the side of the recoil cavity 20 away from the drive shaft 5 is plugged with a sliding top block 12 extending into the corresponding first limiting groove 15. Both sides of the circumference of the sliding top block 12 are provided with a pushing component that can move synchronously with the sliding top block 12, and a plurality of limiting telescopic components that can block the pushing component are provided on both sides of the circumference of the recoil cavity 20; As the rotating plate 10 rotates, the centrifugal force exerted on the sliding top block 12 causes its end, facing away from the drive shaft 5, to remain in contact with the roller 11. As the roller 11 moves eccentrically in tandem with the rotating plate 10, and the volume of the oil inlet cavity plate 9 decreases due to the compression of fuel, the radial displacement of the roller 11 pushes the sliding top block 12 in the opposite direction, toward the drive shaft 5. Simultaneously, the sliding top block 12 drives the pushing component, thereby pushing the fuel in the recoil cavity 20 toward the predetermined oil path.

[0024] See also Figures 3 to 7 The oil inlet cavity plate 9 is embedded in the partition plate 17, and the oil inlet cavity plate 9 and the partition plate 17 are fixedly connected. Therefore, the oil inlet cylinder 3 and the pump body 2 can be separated by the oil inlet cavity plate 9 and the partition plate 17. At the same time, the oil inlet on the outer peripheral surface of the oil inlet cavity plate 9 is connected to the oil inlet cylinder 3, and the oil outlet on the outer peripheral surface of the oil inlet cavity plate 9 is connected to the pump body 2. A plurality of first connecting channels 18 are partially penetrated on the inner bottom surface of the oil inlet cavity plate 9. The setting of the first connecting channels 18 can promote the communication between the oil inlet cavity plate 9 and the oil inlet cylinder 3; When the rotating plate 10 rotates the recoil cavity 20 until it aligns with the first connecting channel 18, fuel enters the recoil cavity 20 through the first connecting channel 18, completing the fuel replenishment. At this point, the sliding top block 12 is at its maximum radial displacement away from the drive shaft 5 due to centrifugal force. As the rotating plate 10 continues to rotate, when the recoil cavity 20 is disconnected from the last first connecting channel 18, both the roller 11 and the sliding top block 12 reach their limit position away from the drive shaft 5. Thereafter, as the rotating plate 10 rotates eccentrically, the roller 11 and the sliding top block 12 begin to radially contract toward the drive shaft 5. The pushing action of the sliding top block 12 directs the fuel in the recoil cavity 20 toward the target oil path.

[0025] See also Figures 3 to 7 A third connecting channel 24 is opened inside the drive shaft 5, and the outer circumferential surface of the drive shaft 5 and the positions corresponding to the multiple recoil cavities 20 are penetrated by second connecting channels 14 that can promote the communication between the recoil cavity 20 and the third connecting channel 24, and each second connecting channel 14 is provided with a second one-way valve 16 with an outlet end facing the third connecting channel 24, and the bottom end of the third connecting channel 24 is penetrated by a first one-way valve 8 with one end entering the recoil cavity plate 6; When the fuel in the recoil cavity 20 is squeezed by the sliding top block 12 and the pushing member, the fuel passes through the guide path formed by the second connecting channel 14, the second one-way valve 16, the third connecting channel 24 and the first one-way valve 8 in sequence, and is directionally injected into the recoil cavity plate 6. The second one-way valve 16 and the first one-way valve 8 ensure that the fuel can only flow toward the filter 4 through the one-way conduction characteristics, thereby avoiding backflow interference. The fuel entering the recoil cavity plate 6 passes through the filter 4 in reverse at a preset pressure. The high-speed flushing flow formed not only acts on the lower surface of the filter, but also penetrates into the pores of the filter. The retained tiny particles and attached impurities are separated from the filter 4 structure through kinetic energy impact. The impurities stripped off by the recoil move downward with the flushing flow, and cooperate with the mechanical scraping effect of the edge of the filter barrel 7 on the lower surface of the filter 4, and finally fall into the filter barrel 7 for collection. This can not only remove impurities accumulated on the surface of the filter 4, but also effectively strip off tiny particles in the pores, fundamentally preventing the filter from being blocked, and significantly improving the self-cleaning ability and long-term reliable operation performance of the fuel filtration.

[0026] Example 2 In the above embodiment, although the filter 4 can be deeply cleaned by fuel backwashing, so that the backwash liquid flow can penetrate deep into the filter pores to remove embedded tiny particles, the continuous backwash liquid flow has the defects of kinetic energy dispersion and insufficient pressure fluctuation, resulting in limited surface stripping effect on adherent impurities. In addition, due to the lack of instantaneous impact force and periodic pressure changes, it is difficult to effectively destroy the adhesion between impurities and filter fibers, so that some deeply retained tiny particles are still prone to accumulation in the pores. This embodiment is specially invented to solve the above problems.

[0027] See also Figures 1 to 7 On the basis of the above embodiment, the technical solution adopted includes that the pushing component includes a driven plate 22 slidably connected to both sides of the sliding top block 12 in the circumferential direction, the side of the driven plate 22 away from the drive shaft 5 is fixedly connected to the second spring 23, the end of the second spring 23 away from the driven plate 22 is fixedly connected to the driving plate 19, one end of the driving plate 19 is fixedly connected to the sliding top block 12, and the other end of the driving plate 19 abuts against the side of the recoil cavity 20, and the end of the driven plate 22 away from the sliding top block 12 also abuts against the side of the recoil cavity 20, and a pressure relief component is provided in the sliding top block 12; Therefore, when the sliding top block 12 moves toward the drive shaft 5 under the push of the roller 11, the driving plate 19 acts synchronously as a rigid extension of the sliding top block 12, and drives the driven plate 22 to slide inward along the side of the recoil cavity 20 by compressing the second spring 23. The three form a linkage structure to ensure that the fuel in the recoil cavity 20 is evenly squeezed and pushed.

[0028] See also Figures 5 and 6 The limiting telescopic component includes a first limiting groove provided on the side of the recoil cavity 20, a limiting ball 13 having one end exposed is slidably connected in the first limiting groove, and one end of the limiting ball 13 is fixedly connected to a first spring 21 having one end fixedly provided on the side of the first limiting groove; Therefore, when the driven plate 22 moves with the sliding top block 12 toward the drive shaft 5 and contacts the stop ball 13, the stop ball 13, under the thrust of the driven plate 22, compresses the first spring 21 and retracts into the first stop groove. Simultaneously, the second spring 23 is compressed and stores energy due to the continued displacement of the driving plate 19. When the sliding top block 12 moves to the critical position, the end surface of the driven plate 22 will pass through the restraint of the stop ball 13. At this time, the elastic potential energy of the second spring 23 is instantly released, driving the driven plate 22 to produce a step-like acceleration motion, creating a pulsed squeeze on the fuel in the recoil cavity 20, forcing the fuel through the guide path in a high-speed jet state. This pulsed flow, leveraging its concentrated kinetic energy release, superimposes high-frequency pressure fluctuations on a continuous backwash flow, creating a composite cleaning flow with both impact and stripping effects. On the one hand, the instantaneous high-speed flow directly impacts the surface of the filter 4, stripping away adherent impurities through kinetic energy impact. On the other hand, the pressure oscillations generated within the flow penetrate deep into the filter pores, disrupting the adhesion balance between tiny particles and fibers through shear force, loosening deeply embedded impurities. In particular, the "water hammer"-like impact generated by the pressure fluctuations further enhances the cleaning effect within the fiber gaps. During this process, the instantaneous high-energy impact of the pulsed liquid flow and the mechanical scraping on the top of the filter barrel 7 work together: the liquid flow is responsible for stripping away stubborn impurities on the surface and in the pores, while the mechanical structure simultaneously collects the stripped impurities and introduces them into the filter barrel 7, avoiding secondary contamination. This effectively solves the problem of traditional cleaning methods that adherent and embedded impurities cannot be completely removed, ensuring that the filter 4 maintains high permeability and stable filtration performance during long-term operation. At the same time, when the sliding top block 12 moves radially away from the drive shaft 5 under the action of centrifugal force, it drives the driving plate 19 and the driven plate 22 to move outward synchronously, relying on the centrifugal driving force to overcome the elastic force of the first spring 21, so that the limiting ball 13 retracts into the first limiting groove, thereby breaking away from the constraint on the driven plate 22 or the driving plate 19, and finally driving the driven plate 22 and the driving plate 19 to return to the initial matching state.

[0029] See also Figures 3 to 7 The pressure relief component includes a pressure relief chamber 26 provided in the sliding top block 12, a pressure relief push plate 25 is slidably connected to the pressure relief chamber 26, and the side of the pressure relief push plate 25 close to the drive shaft 5 is fixedly connected to a third spring 27 with one end fixedly provided on one side of the pressure relief chamber 26. The side of the drive plate 19 close to the drive shaft 5 is provided with a fourth connecting channel 28 connected to the pressure relief chamber 26. The drive plate 19, the driven plate 22 and the sliding top block 12 can form a closed compression space in the recoil cavity 20, and the fourth connecting channel 28 can promote the communication between the compression space and the pressure relief chamber 26. When first connecting channel 18 connects to recoil cavity 20, fuel flows through this channel and simultaneously fills the compression space formed by driver plate 19, driven plate 22, and sliding top block 12. As sliding top block 12 moves toward drive shaft 5, the distance between driver plate 19 and driven plate 22 decreases, increasing the fuel pressure within the compression space. At this point, some fuel flows through fourth connecting channel 28 into pressure relief chamber 26, pushing pressure relief push plate 25 to compress third spring 27 and achieve dynamic pressure accumulation. This process, through a fluid pressure balance mechanism, effectively prevents jamming caused by excessive hydraulic resistance during the movement of driven plate 22, ensuring smooth and efficient reciprocating motion of the push components within recoil cavity 20 and reliably ensuring the stable generation of the subsequent pulsed cleaning fluid flow.

[0030] In summary, when the electric fuel pump assembly is in use, the motor causes the drive shaft 5 to rotate the rotating plate 10 and the filter barrel 7 synchronously. The roller 11, under the action of centrifugal force, forms a sealed cavity to achieve continuous intake and discharge of fuel. Simultaneously, the recoil cavity 20 continuously replenishes fuel through the first connecting channel 18, ensuring a constant recoil flow and maintaining basic cleaning function. When the rotating plate 10 rotates eccentrically, the sliding top block 12, pushed by the roller 11, moves toward the drive shaft 5. The driving plate 19 and the driven plate 22, linked by the second spring 23, compress the fuel in the recoil cavity 20. At this time, the stop ball 13 constrains the driven plate 22 and causes the second spring 23 to store energy. When the sliding top block 12 moves to a critical position, the driven plate 22 passes over the stop ball 13, and the second spring 23 instantly releases its elastic potential energy, driving the driven plate 22 to generate a step-like acceleration, transforming the continuous recoil flow into an intermittent pulsed high-energy jet. This pulsed flow, superimposed with high-frequency pressure fluctuations on the continuous recoil, uses kinetic energy to dislodge impurities adhering to the filter surface. Pressure oscillations disrupt the particle retention equilibrium within the pores, and mechanical scraping at the edge of the filter barrel 7 facilitates impurity collection. The pressure relief component balances the fuel pressure within the compression space through the dynamic pressure accumulation mechanism of the fourth connecting channel 28 and the pressure relief chamber 26, preventing motion stalls in the driven plate 22 and ensuring stable and reliable coordinated action of continuous recoil and pulse enhancement. At the same time, personnel can regularly take out the electric fuel pump assembly from the fuel tank, then remove the filter barrel 7 from the drive shaft 5, and then clean out the collected impurities.

[0031] It should be noted that in the description of the present invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. These are merely for ease of description and are not intended to indicate or imply that the device or component described must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0033] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An electric fuel pump assembly, comprising an oil pool (1) and a pump body (2) disposed therein, wherein a motor is disposed within the pump body (2), characterized in that: The bottom end of the pump body (2) is provided with an oil inlet cylinder (3), the middle of the inner wall of the oil inlet cylinder (3) is fixedly connected to a filter screen (4), and the center of the filter screen (4) is rotatably connected to a drive shaft (5), the top end of the drive shaft (5) is fixedly connected to the motor shaft, and the bottom end of the drive shaft (5) is fixedly connected to a filter barrel (7) capable of scraping and collecting impurities attached to the lower surface of the filter screen (4), a partition plate (17) is provided at the bottom of the pump body (2), an oil inlet cavity plate (9) is provided on the partition plate (17), and a suction component capable of promoting the pumping of fuel into the pump body (2) is provided in the oil inlet cavity plate (9); The suction component includes a rotating plate (10) that can rotate synchronously with the drive shaft (5), and the outer peripheral surface of the rotating plate (10) is embedded with a roller (11) that can be thrown outward by centrifugal force and whose surface can abut against the inner wall of the oil inlet cavity plate (9). The rotating plate (10) is provided with a plurality of recoil components, one end of which can always abut against the roller (11), and the recoil components can recoil the oil in the oil pool (1) onto the filter (4).

2. The electric fuel pump assembly according to claim 1, characterized in that: A notch is provided at the top of one side of the filter barrel (7), and the top of the other side of the filter barrel (7) contacts the filter screen (4), and a roller is rotatably connected to the notch. The end of the filter barrel (7) away from the drive shaft (5) is fitted on the inner wall of the oil inlet barrel (3), and the side of the filter barrel (7) away from the drive shaft (5) is fixedly connected to a limit block that is integrally slidably connected to the oil inlet barrel (3).

3. The electric fuel pump assembly according to claim 2, characterized in that: The outer peripheral surface of the rotating plate (10) is evenly provided with a plurality of first limiting grooves (15), the rollers (11) are slidably arranged in the first limiting grooves (15), the bottom end of the drive shaft (5) passes through the oil inlet cavity plate (9) and the rotating plate (10), and the rotating plate (10) and the drive shaft (5) are fixedly connected, and the upper and lower surfaces of the rotating plate (10) are respectively tightly fitted on the inner top surface and inner bottom surface of the oil inlet cavity plate (9).

4. The electric fuel pump assembly according to claim 3, characterized in that: The recoil component comprises a plurality of recoil cavities (20) uniformly opened on the inner circumference of the rotating plate (10); a recoil cavity plate (6) whose lower surface opening is closely attached to the upper surface of the filter screen (4) is fixedly mounted on the bottom end of the driving shaft (5); a sliding top block (12) having one end extending into a first limiting groove (15) corresponding thereto is inserted into the side of the recoil cavity (20) away from the driving shaft (5); a pushing component capable of moving synchronously with the sliding top block (12) is provided on both circumferential sides of the sliding top block (12); and a plurality of limiting telescopic components capable of blocking the pushing component are provided on both circumferential sides of the recoil cavity (20).

5. The electric fuel pump assembly according to claim 4, characterized in that: The oil inlet cavity plate (9) is embedded in the partition plate (17), so that the oil inlet cylinder (3) and the pump body (2) can be separated by the oil inlet cavity plate (9) and the partition plate (17). A plurality of first connecting channels (18) are provided in a part of the inner bottom surface of the oil inlet cavity plate (9). The provision of the first connecting channels (18) can facilitate the communication between the oil inlet cavity plate (9) and the oil inlet cylinder (3).

6. The electric fuel pump assembly according to claim 5, characterized in that: A third connecting channel (24) is provided inside the driving shaft (5), and second connecting channels (14) are provided at positions on the outer circumference of the driving shaft (5) corresponding to the plurality of recoil cavities (20) so as to facilitate communication between the recoil cavities (20) and the third connecting channel (24), and a second one-way valve (16) with an outlet end facing the third connecting channel (24) is provided in each second connecting channel (14), and a first one-way valve (8) with one end entering into the recoil cavity plate (6) is provided at the bottom end of the third connecting channel (24).

7. The electric fuel pump assembly according to claim 6, characterized in that: The pushing component includes a driven plate (22) slidably connected to both sides of the sliding top block (12) in the circumferential direction, a second spring (23) is fixedly connected to the side of the driven plate (22) away from the drive shaft (5), and an end of the second spring (23) away from the driven plate (22) is fixedly connected to the driving plate (19), one end of the driving plate (19) is fixedly connected to the sliding top block (12), and the other end of the driving plate (19) abuts against the side of the recoil cavity (20), and a pressure relief component is provided in the sliding top block (12).

8. The electric fuel pump assembly according to claim 7, characterized in that: The limiting telescopic component includes a first limiting groove formed on the side of the recoil cavity (20), a limiting ball (13) having one end that can be exposed being slidably connected in the first limiting groove, and one end of the limiting ball (13) is fixedly connected to a first spring (21) having one end fixedly arranged on the side of the first limiting groove.

9. The electric fuel pump assembly according to claim 8, characterized in that: The pressure relief component includes a pressure relief chamber (26) provided in the sliding top block (12), a pressure relief push plate (25) being slidably connected in the pressure relief chamber (26), and a third spring (27) having one end fixedly provided on one side of the pressure relief chamber (26) is fixedly connected to the side of the pressure relief push plate (25) close to the drive shaft (5), and a fourth connecting channel (28) communicating with the pressure relief chamber (26) is provided on the side of the drive plate (19) close to the drive shaft (5).

10. The electric fuel pump assembly according to claim 9, characterized in that: The driving plate (19), the driven plate (22) and the sliding top block (12) can form a compression space in the recoil cavity (20), and the fourth connecting channel (28) can facilitate communication between the compression space and the pressure relief cavity (26).

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