CN216975080U

CN216975080U - Electric fuel pump assembly

Info

Publication number: CN216975080U
Application number: CN202220927943.9U
Authority: CN
Inventors: 蔡良宝; 蔡良丰; 杨奔
Original assignee: Zhejiang Shuangliang Automobile Parts Co ltd
Current assignee: Zhejiang Shuangliang Automobile Parts Co ltd
Priority date: 2022-04-21
Filing date: 2022-04-21
Publication date: 2022-07-15
Anticipated expiration: 2032-04-21

Abstract

The utility model discloses an electric fuel pump assembly, which comprises a pump shell, an oil pump assembly and an oil duct main inlet, wherein the pump shell comprises a shell substrate, a shell side wall and a shell cover, the shell substrate, the shell side wall and the shell cover surround to form a volume cavity, an oil duct outlet is arranged on the shell cover, the oil pump assembly comprises a roller pump, an oil pump motor and a controller, the roller pump and the oil pump motor are arranged in the volume cavity, the oil duct main inlet is arranged on the shell substrate and provides working fluid for the roller pump, an oil duct auxiliary inlet is arranged at the position, close to the output end of the roller pump, of the volume cavity, the oil duct auxiliary inlet is positioned on the side part of the shell cover, a valve assembly is arranged in the oil duct auxiliary inlet, the oil duct auxiliary inlet is closed when the roller pump works, and the oil duct auxiliary inlet is opened when the roller pump does not work. The utility model improves the problem of difficult starting of the engine, is particularly suitable for oil supply systems with weak fluidity such as diesel oil, and can keep good oil pumping performance and ignition speed even at low temperature.

Description

Electric fuel pump assembly

Technical Field

The utility model relates to an electric fuel pump assembly.

Background

An electric fuel pump delivers sufficient fuel to the fuel injector and maintains a nominal pressure to ensure efficient injection of fuel. The electric fuel pump is an extremely important component of an oil supply system and plays an important role in ensuring smoothness and stability of an oil way. Electric fuel pumps are typically constructed as an electromechanical assembly of a micro-pump connected to a micro-motor and encapsulated by a housing and auxiliary components for delivering fuel from the fuel tank to an engine in a fuel supply system for a gasoline or diesel engine (GB/T25984.1-2010).

The electric fuel pump can be generally divided into a brush electric fuel pump and a brushless electric fuel pump, and the brushless fuel pump is favored due to the advantages of long service life, difficult loss, low interference, low noise and the like. CN203271974U discloses a brushless motor roller pump, which integrates a roller pump, a brushless motor controller, and a pressure release valve, so as to reduce the overall installation volume and realize the miniaturization of the structure. Can be used as an independent oil pumping product, and can also be combined with a filter, a fuel sensor and the like. However, the engine is difficult to start and needs a long ignition starting time due to various reasons such as long oil distribution line of an oil supply system, poor sealing performance of a low-pressure oil path of an oil pipe, no manual exhaust when a new machine is off line or no air exhaust when the oil path is disassembled and maintained, and large oil path drop of agricultural machinery and engineering machinery. If the fuel, especially diesel, has reduced fluidity at low temperatures, cold start of the engine is more difficult.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the utility model provides an electric fuel pump assembly which solves the problem that an engine is difficult to start, particularly the problem that the engine is difficult to start in a cold mode.

The technical scheme adopted by the utility model is as follows:

the utility model provides an electric fuel pump assembly, includes pump casing, oil pump subassembly and oil duct main entrance, the pump casing include shell basement, shell lateral wall and cap, shell basement, shell lateral wall and cap surround and form the volume cavity, the cap on be equipped with the oil duct export, the oil pump subassembly include roller pump, oil pump motor and controller, roller pump and oil pump motor set up in the volume cavity, the oil duct main entrance set up on the shell basement, provide working fluid for the roller pump, the output end department that is close to the roller pump of volume cavity be equipped with the oil duct and assist the entry, the oil duct assist the entry and be located the cap lateral part, assist the oil duct in be equipped with the valve module in the entry, close the oil duct when the roller pump during operation and assist the entry, open the oil duct when the roller pump is out of work and assist the entry.

Preferably, the number of the main inlets of the oil channels is four, and the four main inlets are uniformly distributed on the shell base in a circumferential array.

The oil duct main inlets are four and circumferentially and uniformly distributed, so that fuel oil can be ensured to uniformly enter, the entering flow of the fuel oil is large, and the starting efficiency is further improved.

Preferably, the main inlet of the oil passage is provided with a check valve, so that the oil passage is ensured to be smoother.

Preferably, the shell base is provided with a filter screen at an inlet of the main inlet of the oil passage, and the filter screen is used for filtering impurities in the fuel oil, improving the cleanliness of the fuel oil and reducing the loss of a mechanism.

Preferably, the top of the shell cover is provided with a groove, and the controller is horizontally arranged in the groove, so that the space structure is improved, and the shell cover is more compact and reasonable.

Preferably, the bottom of the shell side wall is provided with an annular rolled edge.

The bottom of the side wall of the shell is riveted by adopting an annular edge rolling, so that the fuel pump becomes a non-detachable assembly.

Preferably, at least two mounting convex blocks which are uniformly distributed in the circumferential direction are fixed on the periphery of the shell cover, and a mounting hole is formed in the center of each mounting convex block.

The utility model has the beneficial effects that:

1. the utility model provides two using states for the electric fuel pump: the roller pump is in a working state, fluid enters the pump body from the main inlet of the oil channel, the roller pump works to pump the fluid after being pressurized and then supplies the fluid to the oil supply system, and in a non-stop state, the fluid enters the cavity of the pump assembly from the auxiliary inlet of the oil channel, bypasses the roller pump and flows out from the outlet of the oil channel, so that the roller pump has extremely beneficial effects on starting of an engine, can help the oil supply system to exhaust and eliminate residual pressure, particularly in a low-temperature environment, enhances the fluidity of the fluid, can lubricate a mechanism and reduces abrasion;

2. the electric fuel pump improves the problem of difficult starting of the engine, improves the performances of the oil supply system such as fluidity, starting efficiency and the like, is particularly suitable for the oil supply system with weak fluidity such as diesel oil, and can keep good oil pumping performance and ignition speed even at low temperature;

3. the electric fuel pump assembly is strong in practicability, can be used as an independent oil pumping product, can also be combined with a filter, a fuel sensor and the like to form a vehicle low-pressure oil path oil pumping and exhausting product, is suitable for long oil distribution line of an oil supply system, new machine unloading or disassembly and maintenance, and can be used in the situations of large oil path fall of agricultural machines and engineering machinery, and the like, and keeps good performance.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic cross-sectional view of the present invention;

fig. 3 is a schematic structural view of an oil passage main inlet.

Detailed Description

The utility model is described in further detail below with reference to specific embodiments and with reference to the attached drawings.

The present embodiments provide an electric fuel pump assembly that is generally disposed between an engine and a fuel tank and that continuously draws fuel from the fuel tank to deliver a specified pressure and flow of fuel to a fuel supply system, such as a fuel injector. The electric fuel pump assembly can be externally mounted in an oil supply system, namely, a fuel pump is connected in series in an oil conveying pipeline outside an oil tank, and can also be internally mounted, namely, the fuel pump is installed in the oil tank. It is suitable for various low-pressure oil circuits, is suitable for conveying various fuel media, especially diesel oil and heavy oil, and is especially suitable for medium and large-scale engineering equipment, vehicles and the like.

As shown in fig. 1 to 3, an electric fuel pump assembly includes a pump housing 1, an oil pump assembly 2 and an oil passage main inlet 3, the pump housing 1 includes a housing base 11, a housing side wall 12 and a housing cover 13, the housing base 11, the housing side wall 12 and the housing cover 13 surround to form a volume cavity, the housing cover 13 is provided with an oil passage outlet 14, the oil pump assembly 2 includes a roller pump 21, an oil pump motor 22 and a controller 23, the roller pump 21 and the oil pump motor 22 are disposed in the volume cavity, the oil passage main inlet 3 is disposed on the housing base 11, the volume cavity is provided with an oil passage auxiliary inlet 4 at an output end close to the roller pump 21, the oil passage auxiliary inlet 4 is located at a side portion of the housing cover 13, and a valve assembly 5 is disposed in the oil passage auxiliary inlet 4.

The oil pump motor 22 drives the motor rotor to rotate at high speed after being electrified, the rotor shaft is connected with the roller pump 21, the rotor of the roller pump 21 is eccentrically installed in the pump body, when the pump rotor rotates, the rollers positioned in the grooves press the inner surface of the pump body under the action of centrifugal force to seal the periphery, oil is sucked in while the volume is increased due to the change of the volume of the pump cavity, the natural oil is pressed out while the volume is reduced, and the pressed fuel oil flows through the motor through the pump body and reaches the oil passage outlet 14 to be discharged, so that the fuel oil with certain pressure and flow is provided for a fuel oil system.

The valve assembly 5 is used to close and open the oil passage auxiliary inlet 4, close the oil passage auxiliary inlet 4 when the roller pump 21 is operating, and open the oil passage auxiliary inlet 4 when the roller pump 21 is not operating.

The fuel system is easy to remain gas and pressure for various reasons, especially for the fuel system of a diesel engine, the fuel pipeline forms air resistance once air enters due to compression ignition, the uniformity of fuel supply is influenced, the suction force is weakened and even cut-off occurs, and the diesel engine is difficult to start, insufficient in power or unstable in operation and even cannot start. The conventional methods of using a hand oil pump, loosening a gas release screw and the like to exhaust gas are not easy to exhaust or can enter after the exhaust is completely performed. The embodiment can eliminate residual gas and pressure of a mechanism and an oil supply system when starting, and assist oil supply and supplement oil supply when the pump body needs to work, thereby ensuring the uniformity of oil supply or adapting to the adjustment of working conditions.

The electric fuel pump of the present invention provides two alternative states of use: the first is a pump working state, fuel enters the pump body from the main inlet 3 of the oil duct, and is pressurized and pumped out by the roller pump 21 to provide fuel with certain pressure for the oil supply system; and the first state is a pump stopping state, fluid enters the cavity of the pump assembly from the oil passage auxiliary inlet 4, bypasses the roller pump 21 and flows out through the oil passage outlet 14, so that the exhaust of an oil supply system can be assisted, the residual pressure can be eliminated, the fluidity of fuel oil can be enhanced, particularly for diesel oil, heavy oil and the like with weak fluidity and the use in a low-temperature environment, the mechanism can be lubricated, the abrasion can be reduced, and the starting efficiency of the engine, particularly the cold starting efficiency, can be improved.

Four main oil channel inlets 3 are uniformly distributed on the shell substrate 11 in a circumferential array.

The oil duct main inlet 3 is provided with a check valve.

The housing base 11 is provided with a screen 6 at the inlet of the main inlet 3 of the oil gallery.

The filter screen 6 can be a metal filter screen or textile fabric and the like as a filter material, so that large particles, impurities and the like are prevented from entering the pump body, the cleanness of fluid is improved, and the loss of the mechanism is reduced.

The top of the shell cover 13 is provided with a groove 7, and the controller 23 is horizontally arranged in the groove 7.

The bottom of the shell side wall 12 is provided with an annular rolled edge 8.

At least two mounting convex blocks 9 which are uniformly distributed in a circumferential manner are fixed on the periphery of the shell cover 13, and a mounting hole 10 is formed in the center of each mounting convex block 9.

In the embodiment, a check valve can be arranged at the oil passage main inlet 3 or the oil passage outlet 14, the check valve is used for keeping the oil pressure of the pump assembly within a preset range, such as 250-; when the oil pump stops operating, the check valve will prevent the backflow of fuel under the spring pressure at the gallery outlet 14 check valve.

Finally, it should be noted that the above-mentioned list is only the specific embodiment of the present invention. It is apparent that the present invention is not limited to the above embodiment, and many modifications are possible. All modifications which can be derived or suggested by the person skilled in the art from the present disclosure are to be considered within the scope of the present invention.

Claims

1. The electric fuel pump assembly is characterized by comprising a pump shell (1), an oil pump component (2) and an oil duct main inlet (3), wherein the pump shell (1) comprises a shell base (11), a shell side wall (12) and a shell cover (13), the shell base (11), the shell side wall (12) and the shell cover (13) are encircled to form a volume cavity, the shell cover (13) is provided with an oil duct outlet (14), the oil pump component (2) comprises a roller pump (21), an oil pump motor (22) and a controller (23), the roller pump (21) and the oil pump motor (22) are arranged in the volume cavity, the oil duct main inlet (3) is arranged on the shell base (11), the volume cavity is provided with an oil duct auxiliary inlet (4) at the output end close to the roller pump (21), and the oil duct auxiliary inlet (4) is positioned on the side part of the shell cover (13), and a valve component (5) is arranged in the oil passage auxiliary inlet (4).

2. An electric fuel pump assembly according to claim 1, wherein four of said main gallery inlets (3) are disposed in a circumferential array about said housing base (11).

3. An electric fuel pump assembly according to claim 2, wherein the main gallery inlet (3) is provided with a check valve.

4. An electric fuel pump assembly according to claim 1, characterized in that the housing base (11) is provided with a screen (6) at the inlet of the gallery main inlet (3).

5. An electric fuel pump assembly according to claim 1, wherein the housing cover (13) is formed with a recess (7) at a top portion thereof, and the controller (23) is horizontally disposed in the recess (7).

6. An electric fuel pump assembly according to claim 1, characterized in that the bottom of the housing side wall (12) is provided with an annular bead (8).

7. The electric fuel pump assembly of claim 1, wherein the housing cover (13) has at least two circumferentially and uniformly distributed mounting projections (9) fixed to the periphery thereof, and the mounting projections (9) have a mounting hole (10) formed at the center thereof.