Fuel pump integrating pressure regulation and fuel recovery functions

Abstract

A fuel pump integrating functions of pressure regulation and fuel recovery comprises an oil storage barrel and a filter arranged at an upper port of the oil storage barrel, an integrally formed pressure valve body is arranged at the bottom of the filter, a pressure relief channel is arranged between the valve body and an inner cavity of the filter, and a nozzle assembly is mounted at a pressure outlet of the valve body. The sleeve cover is arranged on one side of the negative pressure cavity and installed at the pressure outlet, the siphon is arranged on the lower side of the negative pressure cavity and penetrates through the oil storage barrel to extend into the oil tank, the oil return pipe is arranged on the upper side of the negative pressure cavity, a pressure release valve communicated with an inner cavity of the oil storage barrel is arranged between the negative pressure cavity and the sleeve cover, and an oil return blocking cover is arranged at a pipe opening of the oil return pipe in a buckled mode. The device has the advantages that the structure is compact, pressure adjustment and efficient fuel oil recovery and circulation can be achieved, and the functions of safe pressure relief and reliable connection are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a fuel pump, especially to a fuel pump with integrated pressure regulating and fuel recovery functions. BACKGROUND

[0002] The fuel pump is a key component of the fuel supply system of an automobile engine, and its performance directly affects the stable operation and efficiency of the engine. The traditional fuel pump usually has an external pressure regulating valve (also known as a pressure regulating valve) outside the oil rail or an independent oil return pipeline, which is used to guide the excess pressure fuel in the system back to the oil tank to maintain the stability of the fuel supply pressure. However, this design has the following significant defects: 1. The external pressure regulating valve increases the complexity of the system pipeline and the number of parts, which increases the cost and failure rate; 2. Its simple oil return method only leads the fuel back to the bottom of the oil tank, which fails to fully utilize the energy of the returned fuel and cannot actively promote the circulation and mixing of the fuel in the oil tank. This leads to the problem that when the fuel level in the oil tank is low, the fuel pump is easy to suck in fuel vapor or air, causing unstable fuel supply, increased noise of the pump body, and even decreased engine power. In addition, the existing structure generally lacks integrated and effective system pressure relief protection devices, and the oil return pipe joint is easy to loosen in the long-term vibration environment of the vehicle, which may cause abnormal noise or leakage risk. SUMMARY

[0003] The utility model aims at solving the deficiency of prior art, provides a kind of fuel pump with integrated pressure regulating and fuel recovery functions, which is compact in structure, can realize pressure regulation, efficient fuel recovery and circulation, and has the functions of safe pressure relief and reliable connection.

[0004] The utility model discloses a kind of fuel pump with integrated pressure regulating and fuel recovery functions, including oil storage barrel, filter being set at the upper end of oil storage barrel, the filter bottom is equipped with the pressure valve body of integrated molding, the pressure valve body and filter inner chamber between are equipped with pressure relief passage, nozzle assembly is installed at the pressure outlet of the pressure valve body, the nozzle assembly includes negative pressure cavity, is equipped with cover and is installed at the pressure outlet of negative pressure cavity, is equipped with siphon tube and is equipped with oil return pipe at the upper side of negative pressure cavity, the negative pressure cavity and cover between are equipped with pressure relief valve, which is communicated with the inner chamber of oil storage barrel, the oil return pipe is buckled with oil return cover at pipe mouth.

[0005] As preferred, the pressure relief valve includes a pressure relief cylinder integrally provided with the negative pressure cavity, the inner cavity of the pressure relief cylinder is communicated with the negative pressure cavity through a pressure relief port, a pressure relief cover is buckled on the pressure relief cylinder, a one-way valve core is arranged in the pressure relief cylinder for plugging the pressure relief port, and a pressure relief spring is arranged between the one-way valve core and the pressure relief cover.

[0006] As preferred, the pressure valve further comprises a valve core arranged in the valve body and a valve cover arranged on the valve body for limiting the valve core, and the cover is buckled with the valve cover.

[0007] As preferred, the oil return pipe is provided with a first buckling block and a vertical buckling block on both sides of the pipe opening, and a beveled opening is arranged on the pipe opening between the first buckling block and the vertical buckling block, and the outer wall of the pipe opening is provided with a mounting block at the beveled opening, and the upper and lower ends of the mounting block are respectively provided with a second buckling block and a positioning plate, and a positioning groove is formed between the second buckling block and the positioning plate.

[0008] As preferred, the oil return cover comprises a first cover body and a second cover body which are integrally formed, the first cover body is provided with a first buckling groove and a vertical buckling groove which are matched with the first buckling block and the vertical buckling block respectively, and the second cover body is provided with a second buckling groove which is matched with the second buckling block, and the second cover body is provided with a positioning strip which can be buckled into the positioning groove at the lower side of the second buckling groove.

[0009] As preferred, the pipe opening of the oil return pipe is inserted into the first cover body, the first buckling block and the vertical buckling block are buckled into the first buckling groove and the vertical buckling groove respectively, the second buckling block is buckled into the second buckling groove, and the positioning strip is buckled into the positioning groove.

[0010] As preferred, the upper side of the oil storage barrel is provided with an upper cover through a supporting rod, and the upper cover is provided with an oil injection pipe and a breather valve.

[0011] As preferred, the filter is of a ring structure, a pump core is arranged in the inner hole of the filter, a filter screen is arranged at the lower side of the pump core, the oil outlet at the upper side of the pump core is connected with the filtering inlet of the filter through a first corrugated pipe, and the filtering outlet of the filter is connected with the oil injection pipe through a second corrugated pipe.

[0012] As preferred, the top outer wall of the filter is outwardly protruding and provided with an oil inlet channel, the filtering inlet is arranged at the top of the oil inlet channel, the top of the inner hole of the filter is outwardly protruding and provided with an oil outlet channel, and the filtering outlet is arranged at the top of the oil outlet channel.

[0013] The beneficial effects of the present utility model are as follows:

[0014] 1. The pressure valve body and the filter are designed as an integrated structure, and the nozzle assembly, the pressure relief valve and the oil return cover are integrated, which greatly simplifies the internal structure and external pipeline of the fuel pump, and reduces the number of parts and assembly complexity.

[0015] 2、When the system pressure is too high, the fuel enters the pressure valve through the pressure relief channel and is ejected from the return pipe at high speed, based on the Venturi effect, a sustained negative pressure will be generated at the inlet of the siphon, thereby actively sucking the fuel at the bottom of the tank into the oil storage bucket, promoting fuel circulation and ensuring that the oil pump can always extract fuel with lower temperature and less gas content, significantly improving the working performance under low oil level conditions and reducing noise and cavitation risk;

[0016] 3、The pressure relief valve integrated on the nozzle assembly provides a direct overpressure protection channel for the system, which can quickly relieve pressure into the oil storage bucket when the pressure is abnormal, improving system safety;

[0017] 4、The multi-directional and multi-point locking structure between the return pipe nozzle and the return cover is tightly combined and can effectively resist long-term vibration during vehicle driving, completely preventing interface loosening and the resulting abnormal noise or leakage, improving product durability;

[0018] 5、The optimized oil inlet and outlet channel design on the filter makes the fuel flow more smoothly, and the setting of the breather valve helps to balance the pressure inside and outside the oil storage bucket. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is the overall structure schematic diagram of the embodiment of the utility model;

[0020] Figure 2 is the internal structure schematic diagram of the embodiment of the utility model;

[0021] Figure 3 is a kind of sectional view of the nozzle assembly of the utility model;

[0022] Figure 4 is the structure schematic diagram of the filter of the utility model;

[0023] Figure 5 is a kind of explosion diagram of the nozzle assembly of the utility model;

[0024] Figure 6 is a kind of explosion diagram of the return pipe and the return cover.

[0025] In the diagram: 1. Oil reservoir; 2. Filter; 21. Pressure relief channel; 22. Filter inlet; 23. Filter outlet; 24. Second bellows; 25. Oil inlet channel; 26. Oil outlet channel; 3. Pressure valve; 31. Valve body; 32. Valve core; 33. Valve cover; 4. Nozzle assembly; 41. Negative pressure chamber; 42. Cover; 43. Siphon pipe; 44. Return oil pipe; 441. First fastening block; 442. Vertical fastening block; 443. Angled opening; 444. Mounting block; 445. Second fastening block ; 446, Positioning plate; 447, Positioning groove; 45, Pressure relief valve; 451, Pressure relief cylinder; 452, Pressure relief port; 453, Pressure relief cover; 454, One-way valve core; 455, Pressure relief spring; 5, Oil return cover; 51, First cover; 52, Second cover; 53, First snap groove; 54, Vertical snap groove; 55, Second snap groove; 56, Positioning strip; 6, Support rod; 7, Top cover; 71, Injection pipe; 72, Breather valve; 8, Pump core; 81, Filter screen; 82, First bellows. Detailed Implementation

[0026] The technical solution of this utility model will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0027] Example: Figures 1 to 6 The fuel pump shown includes an integrated pressure regulation and fuel recovery function, comprising a fuel tank 1, a filter 2 disposed at the upper port of the fuel tank 1, and an upper cover 7 provided on the upper side of the fuel tank 1 via a support rod 6. The upper cover 7 is provided with a fuel injection pipe 71 and a breather valve 72.

[0028] The filter 2 has a ring-shaped structure. A pump core 8 is installed in the inner hole of the filter 2. A filter screen 81 is installed on the lower side of the pump core 8. The oil outlet on the upper side of the pump core 8 is connected to the filter inlet 22 of the filter 2 through a first corrugated pipe 82. The filter outlet 23 of the filter 2 is connected to the fuel injection pipe 71 through a second corrugated pipe 24. The top outer wall of the filter 2 has an outward protrusion oil inlet channel 25. The filter inlet 22 is located at the top of the oil inlet channel 25. The top of the inner hole of the filter 2 has an outward protrusion oil outlet channel 26. The filter outlet 23 is located at the top of the oil outlet channel 26. This structure optimizes the internal oil circuit.

[0029] The bottom of the filter 2 is provided with an integrally formed pressure valve body 31. A pressure relief channel 21 is provided between the valve body 31 and the inner cavity of the filter 2. The pressure valve 3 also includes a valve core 32 disposed in the valve body 31 and a valve cover 33 fastened to the valve body 31 to limit the valve core 32.

[0030] The nozzle assembly 4 is installed at the pressure outlet of the valve body 31, and includes a negative pressure cavity 41, a cover 42 installed at one side of the negative pressure cavity 41 and at the pressure outlet, a siphon pipe 43 extending to the oil tank through the oil storage bucket 1 and arranged at the lower side of the negative pressure cavity 41, and an oil return pipe 44 arranged at the upper side of the negative pressure cavity 41. The cover 42 is buckled with the valve cover 33, and the negative pressure cavity 41 is provided with a pressure relief valve 45 communicating with the inner cavity of the oil storage bucket 1 between the cover 42 and the negative pressure cavity 41. The pressure relief valve 45 includes a pressure relief cylinder 451 integrally arranged with the negative pressure cavity 41, and the inner cavity of the pressure relief cylinder 451 communicates with the negative pressure cavity 41 through a pressure relief port 452. The pressure relief cylinder 451 is buckled with a pressure relief cover 453, and the pressure relief cylinder 451 is provided with a one-way valve core 454 for plugging the pressure relief port 452. The one-way valve core 454 and the pressure relief cover 453 are provided with a pressure relief spring 455 therebetween.

[0031] The oil return pipe 44 is provided with a first buckling block 441 and a vertical buckling block 442 at both sides of the pipe opening, respectively, and is provided with an inclined opening 443 at the pipe opening between the first buckling block 441 and the vertical buckling block 442. The outer wall of the pipe opening is provided with a mounting block 444 at the inclined opening 443, and the upper and lower ends of the mounting block 444 are respectively provided with a second buckling block 445 and a positioning plate 446, and the second buckling block 445 and the positioning plate 446 form a positioning groove 447 therebetween.

[0032] The oil return pipe 44 is provided with a first buckling block 441 and a vertical buckling block 442 at both sides of the pipe opening, respectively, and is provided with an inclined opening 443 at the pipe opening between the first buckling block 441 and the vertical buckling block 442. The outer wall of the pipe opening is provided with a mounting block 444 at the inclined opening 443, and the upper and lower ends of the mounting block 444 are respectively provided with a second buckling block 445 and a positioning plate 446, and the second buckling block 445 and the positioning plate 446 form a positioning groove 447 therebetween.

[0033] When the engine is working, the pump core 8 pumps the fuel out under pressure, which is filtered by the filter 2 and then supplied to the engine through the fuel injection pipe 71; when the system oil pressure exceeds the set value, the valve core 32 of the pressure valve 3 is pushed open, and part of the high-pressure fuel flows into the negative pressure cavity 41 of the nozzle assembly 4 through the pressure relief channel 21 and the valve body 31, and is finally sprayed out at high speed from the inclined port 443 of the return pipe 44; in this spraying process, the high-speed fuel flows through the specific flow channel of the negative pressure cavity 41, and according to the principle of fluid mechanics, a significant negative pressure (siphon effect) is generated at the inlet of the siphon pipe 43 connected thereto, so that the low-temperature fuel at the bottom of the fuel tank is continuously sucked into the oil storage bucket 1 through the siphon pipe 43, and this process realizes efficient and active fuel circulation and cooling; if the fuel system abnormally exceeds the pressure due to failure, when the pressure is sufficient to overcome the elastic force of the pressure relief spring 455, the one-way valve core 454 will be pushed open, and the high-pressure fuel will directly flow into the oil storage bucket 1 through the pressure relief port 452 and the pressure relief valve 45, thereby playing a safety protection role; the breather valve 72 is used to balance the air pressure between the inside of the oil storage bucket 1 and the fuel tank.

Claims

1. A fuel pump integrating pressure regulating and fuel recovery functions, comprising a fuel storage tank (1) and a filter (2) arranged at the upper port of the fuel storage tank (1), characterized in that: The filter (2) bottom is provided with an integrally formed pressure valve (3) valve body (31), the valve body (31) and filter (2) inner cavity between provided with pressure relief channel (21), the valve body (31) pressure outlet is installed with nozzle assembly (4), the nozzle assembly (4) includes negative pressure cavity (41), the sleeve cover (42) is arranged in negative pressure cavity (41) one side and is installed in pressure outlet, the siphon (43) is arranged in negative pressure cavity (41) downside and extends to the oil tank in oil storage barrel (1), and the oil return pipe (44) is arranged in negative pressure cavity (41) upside, the negative pressure cavity (41) and sleeve cover (42) between provided with the pressure relief valve (45) with oil storage barrel (1) inner cavity communication, the oil return pipe (44) pipe mouth is buckled with oil return cover (5).

2. The fuel pump integrated with pressure regulating and fuel recovery functions according to claim 1, characterized in that: The pressure relief valve (45) includes a pressure relief cylinder (451) integrally arranged with the negative pressure cavity (41), the pressure relief cylinder (451) inner cavity is communicated with the negative pressure cavity (41) through the pressure relief port (452), the pressure relief cylinder (451) is buckled with the pressure relief cover (453), the pressure relief cylinder (451) is provided with a one-way valve core (454) for blocking the pressure relief port (452), the one-way valve core (454) and the pressure relief cover (453) are provided with a pressure relief spring (455).

3. The fuel pump integrated with pressure regulating and fuel recovery functions according to claim 1, characterized in that: The pressure valve (3) further includes a valve core (32) arranged in the valve body (31) and a valve cover (33) buckled on the valve body (31) for limiting the valve core (32), the sleeve cover (42) is buckled with the valve cover (33).

4. The fuel pump integrated with pressure regulating and fuel recovery functions according to claim 1, characterized in that: The oil return pipe (44) is provided with a first buckling block (441) and a vertical buckling block (442) on both sides of the pipe mouth, and an inclined opening (443) is formed on the pipe mouth between the first buckling block (441) and the vertical buckling block (442), and the outer wall of the pipe mouth is provided with a mounting block (444) at the inclined opening (443), and the upper and lower ends of the mounting block (444) are respectively provided with a second buckling block (445) and a positioning plate (446), and a positioning groove (447) is formed between the second buckling block (445) and the positioning plate (446).

5. The fuel pump integrated with pressure regulating and fuel recovery functions according to claim 4, characterized in that: The oil return cover (5) includes a first cover body (51) and a second cover body (52) integrally formed, the first cover body (51) is provided with a first buckling groove (53) and a vertical buckling groove (54) matched with the first buckling block (441) and the vertical buckling block (442) respectively, the second cover body (52) is provided with a second buckling groove (55) matched with the second buckling block (445), and the second cover body (52) is provided with a positioning strip (56) buckled into the positioning groove (447) on the downside of the second buckling groove (55).

6. The fuel pump integrated with pressure regulating and fuel recovery functions according to claim 5, characterized in that: The oil return pipe (44) is inserted into the first cover body (51), the first buckling block (441) and the vertical buckling block (442) are buckled into the first buckling groove (53) and the vertical buckling groove (54) respectively, the second buckling block (445) is buckled into the second buckling groove (55), and the positioning strip (56) is buckled into the positioning groove (447).

7. The fuel pump integrated with pressure regulating and fuel recovery functions according to claim 1, characterized in that: The upper side of the oil storage barrel (1) is provided with an upper cover (7) through a support rod (6), and the upper cover (7) is provided with an oil injection pipe (71) and a breather valve (72).

8. The fuel pump integrated with pressure regulating and fuel recovery functions according to claim 7, characterized in that: The filter (2) is of a ring structure, a pump core (8) is arranged in the inner hole of the filter (2), the lower side of the pump core (8) is provided with a filter screen (81), the upper oil outlet of the pump core (8) is connected with the filtering inlet (22) of the filter (2) through a first corrugated pipe (82), and the filtering outlet (23) of the filter (2) is connected with the oil injection pipe (71) through a second corrugated pipe (24).

9. The fuel pump integrated with pressure regulating and fuel recovery functions according to claim 8, characterized in that: The top outer wall of the filter (2) is outwardly protrudingly provided with an oil inlet channel (25), the filtering inlet (22) is arranged at the top of the oil inlet channel (25), the inner hole top of the filter (2) is outwardly protrudingly provided with an oil outlet channel (26), and the filtering outlet (23) is arranged at the top of the oil outlet channel (26).

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