CN220067182U - Excitation rotating assembly and fuel pump capable of being used in fuel oil environment - Google Patents

Abstract

The utility model discloses an excitation rotating assembly and a fuel pump which can be used in a fuel oil environment, and belongs to the technical field of liquid conveying equipment; the upper ends of the main shaft and the stator assembly are connected with the motor end cover, and the lower end of the rotor assembly drives the pump impeller in the pump head assembly to rotate; the stator assembly and the rotor assembly are internally provided with fuel passages which are vertically communicated. The fuel pump comprises a pump shell, a pump head assembly and an excitation rotating assembly, wherein the pump head assembly and the excitation rotating assembly are arranged in the pump shell from bottom to top. The excitation rotating assembly and the controller are assembled into a brushless direct current motor, so that the efficiency is high, the noise and maintenance cost are low, the service life is long, and the safety performance is high; meanwhile, the excitation rotating assembly is arranged in a fuel environment, so that the temperature reduction effect can be achieved, and the fuel inlet and outlet are arranged at two ends of the fuel pump, so that continuous oil supply can be achieved.

Description

Excitation rotating assembly and fuel pump capable of being used in fuel oil environment

Technical Field

The utility model belongs to the technical field of liquid conveying equipment, and particularly relates to an excitation rotating assembly and a fuel pump which can be used in a fuel oil environment.

Background

The fuel pump is one of the basic components of an electronic injection automobile fuel injection system, is positioned in a vehicle fuel tank, and works during starting and engine operation. The fuel pump is used for sucking out fuel from the fuel tank, pressurizing and then delivering the fuel to the fuel supply pipe, and establishing a certain fuel pressure by matching with the fuel pressure regulator, and delivering high-pressure fuel to the fuel distribution pipe so as to ensure continuous fuel supply to the fuel spray nozzle.

At present, a brush direct current motor is adopted as a motor of the existing fuel pump, and the friction loss phenomenon exists due to long-term operation of a carbon brush and a commutator structure, so that the noise is high, and the motor efficiency is low; when the carbon brush and the commutator are seriously worn, the carbon brush and the commutator need to be maintained and replaced, the maintenance cost is high, and the service life is limited. In addition, the friction between the brush and the commutator is easy to generate sparks, and great potential safety hazards exist for the fuel pump. Meanwhile, the pump head of the existing fuel pump adopts a structure that an oil inlet and an oil outlet are arranged oppositely, the structure can generate intermittent oil supply phenomenon, and the phenomenon of dry combustion of the engine is easy to occur due to the fact that continuous oil supply cannot be performed, particularly when the fuel oil liquid level is low, so that the fuel pump has certain limitation.

Disclosure of Invention

The utility model aims to provide an excitation rotating assembly and a fuel pump which can be used in a fuel oil environment, and aims to solve the problems of high noise, low efficiency, high maintenance cost, low service life and high potential safety hazard caused by serious loss of a brush direct current motor in the prior art and the technical problem that continuous oil supply cannot be realized due to the relative arrangement of oil inlet and outlet ports of the conventional fuel pump.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the excitation rotating assembly comprises a motor shell, a rotor assembly and a stator assembly, wherein the rotor assembly and the stator assembly are arranged in the motor shell, the stator assembly is fixed in the motor shell, the rotor assembly is sleeved on a main shaft of the fuel pump, the stator assembly is arranged outside the rotor assembly, and a gap is arranged between the rotor assembly and the stator assembly; the upper end of the main shaft and the upper end of the stator assembly are connected with the motor end cover, the stator assembly can be electrically connected with a controller outside the motor end cover, and the motor shell, the rotor assembly, the stator assembly, the motor end cover and the controller are assembled into a brushless direct current motor; the lower end of the rotor assembly is connected with the pump head assembly; the stator assembly and the rotor assembly are internally provided with fuel channels for fuel to pass through, the inlets at the lower ends of the fuel channels are communicated with the oil outlets of the pump head assemblies, and the outlets at the upper ends of the fuel channels are communicated with oil outlets at the junction of the motor end cover and the motor shell.

Preferably, the lower extreme of rotor assembly passes through the shaft coupling and links to each other with the pump head subassembly for the impeller assembly in the drive pump head subassembly is rotatory, the both ends of rotor assembly all are equipped with oily bearing, oily bearing is interference fit with the rotor assembly.

Preferably, the rotor assembly comprises a rotor core and a magnet; the stator assembly comprises an injection molding shell and a stator core and a winding inside the injection molding shell; the inner wall of the injection molding shell is provided with a plurality of oil passing grooves, and the injection molding shell is provided with a fuel oil channel formed by the oil passing grooves and gaps between the stator core and the rotor core.

Preferably, the upper packaging part of the stator assembly is connected with a controller through a conductor, the controller is arranged in a cavity between the motor end cover and the connector end cover, the motor end cover is connected with the connector end cover in a sealing way, and a power interface connected with a power line is arranged on the side surface of the connector end cover; the motor end cover is characterized in that the periphery of the bottom of the motor end cover is provided with convex eaves connected with a motor shell, and two sinking grooves and through holes for oil discharge pipes to pass through are formed in the periphery of the convex eaves.

Preferably, the conductor is of a split structure, the upper packaging part and the motor end cover are internally provided with a first conductor and a second conductor respectively, the lower end of the first conductor is electrically connected with the winding, the upper end of the first conductor is electrically connected with the lower end of the second conductor through the plug spring terminal, and the upper end of the second conductor is electrically connected with the controller.

Preferably, a sealing ring is arranged on the matching surface of the motor end cover and the connector end cover; the connector end cover is connected with the edge of the motor end cover through a clamping structure, and the clamping structure is arranged on the outer side of the sealing ring; the clamping structure comprises clamping grooves and positioning protruding blocks, the clamping grooves are arranged on the bottom surface of the connector end cover at intervals, inner barbs are arranged on the inner wall of the clamping grooves, a plurality of positioning protruding blocks matched with the clamping grooves are correspondingly arranged on the top surface of the motor end cover, and outer barbs matched with the inner barbs are arranged on the side surfaces of the positioning protruding blocks.

The utility model also provides a fuel pump which comprises a pump shell, a pump head assembly and an excitation rotating assembly, wherein the pump head assembly and the excitation rotating assembly are arranged in the pump shell from bottom to top; a sealing ring is arranged between the lower end of the pump head assembly and the pump shell, and a filter screen is arranged at the oil inlet of the lower end of the pump head assembly.

Preferably, the pump shell and the motor end cover are connected by spin riveting, one end of the motor end cover connected with the pump shell is a conical inclined surface protruding outwards, the tail end of the pump shell is a conical spin riveting surface matched with the inclined surface, the spin riveting surface is provided with a punching riveting point, and the inclined surface of the motor end cover is provided with a punching riveting reserved hole corresponding to the punching riveting point.

Preferably, a frame-type mounting bracket is arranged outside the pump housing, the mounting bracket is correspondingly arranged on the outer side of the excitation rotating assembly, and a plurality of hollow areas are formed at the upper part of the mounting bracket corresponding to the junction of the motor end cover and the motor housing and used for discharging fuel flowing out of the fuel channel; a sealing groove for installing a sealing ring is arranged on the outer surface of the lower part of the motor end cover; the upper end of the mounting bracket is abutted with the lower end face of the outer side of the motor end cover, a check ring is arranged at the lower end of the mounting bracket, and a sealing ring is arranged between the check ring and the mounting bracket.

Preferably, the pump head assembly comprises a pump body and an impeller assembly, the pump body comprises a pump end cover, a pump cavity and a pump cavity upper cover which are sequentially connected, the inner cavities of the pump end cover, the pump cavity and the pump cavity upper cover are communicated, the impeller assembly is arranged in the pump cavity, the lower end of the main shaft is fixed in a middle mounting hole of the pump end cover, the pump end cover and the pump cavity upper cover are coincident with the central axis of the main shaft, and the inner cavity of the pump cavity is cylindrical, and the central axis of the pump cavity is eccentrically arranged relative to the central axis of the main shaft; an oil inlet is formed in one side of the pump end cover, and an oil outlet communicated with the pump cavity is formed in the pump cavity upper cover; the pump end cover is internally provided with a valve cavity for accommodating the safety valve, and the top of the valve cavity is provided with an oil return hole communicated with a high-pressure area in the pump cavity and used for returning fuel oil to the oil inlet end of the pump end cover for pressure relief through the safety valve when the oil pressure in the pump cavity is overlarge;

the impeller assembly comprises a pump impeller and a plurality of rollers, the pump impeller is in running fit with the main shaft through a shaft sleeve, the rollers are correspondingly arranged in grooves on the cylindrical surface around the pump impeller, and a plurality of limiting grooves for being matched with the coupler are formed in the inner hole wall of the pump impeller; the excitation rotating assembly drives the impeller assembly to rotate through the coupler to suck fuel oil into the pump body from the oil inlet and discharge the fuel oil through the oil outlet.

The beneficial effects of adopting above-mentioned technical scheme to produce lie in: compared with the prior art, the rotor assembly and the stator assembly are arranged in the motor shell, the rotor assembly is sleeved on the main shaft of the fuel pump, and the lower end of the rotor assembly is connected with the impeller assembly in the pump head assembly through the coupler, so that the impeller assembly can be driven to rotate. The excitation rotating assembly and the controller adopting the structure are assembled into the brushless direct current motor, and the brushless direct current motor has the advantages of improving efficiency, reducing noise and maintenance cost, prolonging service life and being high in safety performance. Meanwhile, the fuel oil channels for fuel oil to pass through are arranged in the stator assembly and the rotor assembly, so that the excitation rotating assembly can be placed in a fuel oil environment, and the fuel oil inlets and outlets are arranged at two ends of the fuel pump, so that continuous oil supply can be realized, and meanwhile, the cooling effect of the internal excitation rotating assembly can be realized; and the filter screen is arranged at the oil inlet at the lower end, so that fuel entering the pump body can be filtered, and the cleanliness of the inside of the fuel pump and matched equipment thereof is ensured.

Drawings

The utility model will be described in further detail with reference to the drawings and the detailed description.

FIG. 1 is a schematic illustration of a field rotating assembly that may be used within a fuel environment, provided in accordance with an embodiment of the present utility model;

FIG. 2 is a schematic diagram of a fuel pump according to an embodiment of the present utility model;

FIG. 3 is an exploded schematic view of the fuel pump of FIG. 2;

FIG. 4 is a schematic structural view of the stator assembly of FIG. 3;

FIG. 5 is an exterior view of the motor end cap of FIG. 3;

FIG. 6 is an enlarged view of a portion of FIG. 1 at A;

FIG. 7 is a profile view of the pump housing of FIG. 3;

FIG. 8 is a side view of the motor end cap of FIG. 3;

FIG. 9 is a top view of the motor end cap of FIG. 8;

FIG. 10 is a cross-sectional view B-B in FIG. 9;

FIG. 11 is a bottom view of the connector end cap of FIG. 1;

FIG. 12 is a cross-sectional view C-C of FIG. 11;

FIG. 13 is a schematic view of the pump head assembly of FIG. 3;

FIG. 14 is an exploded view of a pump head assembly in an embodiment of the utility model;

FIG. 15 is a schematic view of the impeller of FIG. 1;

FIG. 16 is a schematic view of the pump chamber of FIG. 1;

FIG. 17 is a schematic view of the position of the pump chamber upper cover of FIG. 1 relative to the spindle;

FIG. 18 is a schematic view of the valve cover of FIG. 1;

FIG. 19 is a top view of the pump end cap of FIG. 1;

FIG. 20 is a schematic view of the placement of a impeller assembly within a pump chamber in an embodiment of the utility model;

in the figure: 00-pump head assembly; 1-main shaft, 2-oil inlet, 3-oil outlet, 4-pump end cover, 5-pump cavity, 6-pump cavity upper cover, 7-oil suction hole, 8-pump impeller, 9-roller, 10-shaft sleeve, 11-groove, 12-limit groove, 13-bolt, 14-arc groove, 15-liquid inlet cavity, 16-safety valve, 160-oil passing hole, 161-plunger, 162-spring, 163-valve cover and 164-connecting rib; 17-oil return holes, 18-filter screens, 19-reinforcing ribs and 20-sealing rings; 21-an identification slot;

22-motor housing, 23-rotor assembly, 24-stator assembly, 241-injection molded shell, 242-oil trough; 25-motor end covers, 26-couplings, 27-oil bearings, 28-conductors, 29-controllers, 30-connector end covers, 31-power interfaces, 32-plug spring terminals, 33-retainer rings, 34-pump housings, 35-mounting brackets; 36-oil drain port, 37-clamping groove, 38-positioning protruding block, 39-inner barb, 40-inclined plane, 41-spin riveting surface, 42-punching riveting point and 43-punching riveting preformed hole; 44-plain washer, 45-C ring.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1 and 2, the present utility model provides an excitation rotating assembly used in a fuel oil environment, the excitation rotating assembly includes a motor housing 22, a rotor assembly 23 and a stator assembly 24 inside the motor housing 22, the stator assembly 24 is fixed in the motor housing 22, the rotor assembly 23 is sleeved on a main shaft 1 of a fuel pump, the stator assembly 24 is arranged outside the rotor assembly 23, and a gap is provided between the rotor assembly 23 and the stator assembly 24; the upper end of the main shaft 1 and the upper end of the stator assembly 24 are connected with a motor end cover 25, the stator assembly 24 can be electrically connected with a controller 29 outside the motor end cover 25, and the motor shell 22, the rotor assembly 23, the stator assembly 24, the motor end cover 25 and the controller 29 are assembled into a brushless direct current motor; the lower end of the rotor assembly 23 is connected with the pump head assembly 00; the stator assembly 24 and the rotor assembly 23 are internally provided with fuel passages for fuel to pass through, the lower end inlets of the fuel passages are communicated with the oil outlet of the pump head assembly 00, and the upper end outlets of the fuel passages are communicated with the oil drain port at the junction of the motor end cover 25 and the motor shell 22. Wherein, the rotor assembly 23 can float up and down on the main shaft 1, and has a shifting amount of about 1mm in the axial direction; the upper end of the rotor assembly 23 is axially restrained by a C-ring 45. The arrows in fig. 1 and 2 indicate the fuel flow direction. The excitation rotating assembly with the structure can be placed in a fuel environment, a fuel channel can vertically penetrate through the inside of the rotor assembly 23 and the stator assembly 24, a fuel inlet and a fuel outlet are arranged at two ends of the fuel pump, continuous oil supply can be realized, and meanwhile, the cooling effect of the excitation rotating assembly inside the fuel pump can be achieved.

In one embodiment of the present utility model, as shown in fig. 1 and 4, the rotor assembly 23 includes a rotor core and a magnet, oil-containing bearings 27 are disposed at two ends of the rotor assembly 23, the outer surface of the oil-containing bearings 27 is in interference fit with the rotor assembly 23, an inner hole of the oil-containing bearings 27 is in running fit with the spindle 1, and a flat washer 44 is disposed at the top of the upper end of the rotor assembly 23 and the oil-containing bearings inside the rotor assembly; the stator assembly 24 includes an injection molded housing 241 and its internal stator core and windings; an oil passing groove 242 is formed in the inner wall of the injection molding shell 241, and a fuel oil channel is formed in the injection molding shell 241 through the oil passing groove 242 and a gap between the stator core and the rotor core. The rotor can convert electric energy into mechanical energy under the action of a magnetic field generated by the stator; after the stator coil is electrified, an excitation magnetic field can be generated, and force is applied to the rotor assembly, so that the rotor assembly drives the pump impeller in the pump head assembly to rotate through the coupler.

In the embodiment shown in fig. 4, 6 oil grooves 1.5mm wide are provided in the inner wall of the injection molding housing 241, and the gap between the stator assembly 24 and the rotor assembly 23 is capable of allowing fuel to pass therethrough.

In a specific design, as shown in fig. 1 and 5, in the specific design, an upper packaging part and a lower packaging part are respectively arranged at the upper end and the lower end of the stator assembly 24, and the upper end of the main shaft 1 and the upper packaging part of the stator assembly 24 are connected with a motor end cover 25; the upper packaging part of the stator assembly 24 is connected with a controller 29 through a conductor 28, and the motor shell 22, the rotor assembly 23, the stator assembly 24, the motor end cover 25 and the controller 29 are assembled into a brushless direct current motor; the controller 29 is disposed in a cavity between the motor end cover 25 and the connector end cover 30, the motor end cover 25 is connected with the connector end cover 30 in a sealing manner, and a power interface 31 connected with a power line is disposed on a side surface of the connector end cover 30. During assembly, the controller 29 is arranged in the cavity between the motor end cover 25 and the connector end cover 30, so that the motor end cover is isolated from fuel oil, and the electricity utilization safety is ensured. The controller adopts PCBA (printed circuit board), can control the working time of the fuel pump, and has the functions of reverse connection prevention, high-temperature protection, current limiting, overvoltage and undervoltage protection. The brushless direct current motor provided by the utility model has the following advantages:

(1) And the motor efficiency is high. The brushless direct current motor structure is adopted, and the rotor is a permanent magnet, so that no excitation loss exists; compared with a brush direct current motor, the brush direct current motor has no carbon brush and commutator structure, and carbon brush loss is reduced; stepless speed regulation can be realized, and multi-stage speed reduction loss is eliminated. Efficiency has been improved from the motor structure. Besides, the motor is simulated and designed through AnsysHFSS software, so that the design efficiency is high; the stator and rotor punching sheets are made of 50A470 cold-rolled silicon steel sheets, so that the iron loss is small; the rotor magnet is made of neodymium iron boron permanent magnet materials, and is strong in magnetic pole and extremely high in magnetic permeability. Through the above measures, the motor efficiency is higher than that of domestic similar motors and other motors.

(2) And the service life is long. The motor has no brush, and can not be replaced and maintained due to the abrasion of the brush; but is controlled by a controller, and the service life of the controller is more than 2 ten thousand hours.

(3) Small volume and light weight. The motor has high efficiency and small size of parts; and the building block type design is adopted, the structure is compact, and the volume and the weight are further reduced.

(4) No spark is generated and the safety is high. The motor has no brush and commutator, no spark is generated due to friction between the brush and the commutator, the safety is greatly improved, and the motor is more important for the fuel pump.

(5) And the noise is low. The motor is brushless, and friction noise caused by abrasion of the brush is avoided; simple structure, accurate cooperation installation of spare part, the operation is smoother. Therefore, the noise is low, and the requirement of high-silence equipment can be met.

As shown in fig. 8, in the specific design of the motor end cover 25, the periphery of the bottom of the motor end cover 25 is provided with convex eaves connected with the motor housing 22, and the convex eaves are circumferentially and symmetrically provided with two sinking grooves 36, so that the motor end cover can be easily lifted out by means of a simple tool (such as a straight screwdriver) after being mounted on a plane. Meanwhile, an oil drain port communicated with the inner cavity below the motor end cover is arranged on the convex eave, so that high-pressure fuel in the motor end cover and the motor shell can be conveniently discharged.

As a preferred structure, as shown in fig. 1, the conductor 28 is a split structure, the upper package part and the motor end cover 25 are respectively provided with a first conductor and a second conductor, the lower end of the first conductor is electrically connected with the winding, the upper end of the first conductor is electrically connected with the lower end of the second conductor through the plug spring terminal 32, and the upper end of the second conductor is electrically connected with the controller 29. The motor end cover 25 and the connector end cover 30 are manufactured by injection molding, so that a conduit of a safety conductor can be designed in advance in the manufacturing process, and the safety of the conductor is ensured.

Further optimizing the above technical solution, as shown in fig. 1, 6, 9-12, the controller 29 is disposed in the motor end cover 25, and a heat dissipation cavity is disposed in the connector end cover 30, so that the internal controller can dissipate heat in time during operation; the sealing ring 20 is arranged on the matching surface of the motor end cover 25 and the connector end cover 30, so that the sealing performance is improved; the edge of the connector end cover 30 and the edge of the motor end cover 25 are connected through a clamping structure, and the clamping structure is arranged on the outer side of the sealing ring 20; the clamping structure comprises a clamping groove 37 and positioning protruding blocks 38, the clamping grooves 37 are arranged on the bottom surface of the connector end cover 30 at intervals, inner barbs 39 are arranged on the inner wall of the clamping groove 37, a plurality of positioning protruding blocks 38 matched with the clamping groove 37 are correspondingly arranged on the top surface of the motor end cover 25, and outer barbs matched with the inner barbs 39 are arranged on the side surfaces of the positioning protruding blocks 38. The connector end cap 30 is assembled with the motor end cap 25 using a snap-fit structure that fits tightly without loosening without requiring bolting.

The utility model also provides a fuel pump, as shown in fig. 2 and 3, comprising a pump shell 34, a pump head assembly and an excitation rotating assembly, wherein the pump head assembly and the excitation rotating assembly are arranged in the pump shell 34 from bottom to top; a sealing ring 20 is arranged between the lower end of the pump head assembly and the pump shell 34, and a filter screen 18 is arranged at the oil inlet of the lower end of the pump head assembly. The lower end of the rotor assembly 23 is connected with an impeller assembly in the pump head assembly 00 through a coupler 26, and is used for driving the impeller assembly to rotate, so that the purpose of sucking fuel oil is achieved. All fuel pumps containing the exciting rotating assembly are within the protection scope of the utility model.

In a specific embodiment of the present utility model, as shown in fig. 2, 7 and 8, the pump housing 34 is connected to the motor end cover 25 by spin riveting, one end of the motor end cover 25 connected to the pump housing 34 is a conical inclined surface 40 protruding outwards, the end of the pump housing 34 is a conical spin riveting surface 41 matched with the inclined surface, the spin riveting surface 41 is provided with a punch riveting point 42, and the inclined surface of the motor end cover 25 is provided with a punch riveting preformed hole 43 corresponding to the punch riveting point 42. The adoption of the structure can ensure that the pump shell 34 is reliably connected with the motor end cover 25 and is tightly attached, and the structure is simple and the process is advanced. Wherein, two punching and riveting points 42 and punching and riveting preformed holes 43 are respectively designed on the spin riveting surfaces of the motor end cover and the pump shell, and the anti-rotation function is achieved.

Further optimizing the above technical solution, as shown in fig. 2 and 3, a frame-type mounting bracket 35 is provided outside the pump housing 34, the mounting bracket 35 is correspondingly provided outside the excitation rotating assembly, a plurality of hollow areas are provided on the upper part of the mounting bracket 35, and fuel flowing out of the fuel channel enters the junction between the motor end cover and the motor housing and is discharged through the hollow areas; a sealing groove for installing the sealing ring 20 is arranged on the outer surface of the lower part of the motor end cover 25; the upper end of the mounting bracket 35 is abutted against the lower end face of the outer side of the motor end cover 25, a retainer ring 33 is arranged at the lower end of the mounting bracket 35, and a sealing ring 20 is arranged between the retainer ring 33 and the mounting bracket 35. The check ring is fixed on the pump shell, and the mounting bracket can be limited by the check ring. The fuel pump can be arranged in the filter by means of the mounting bracket and the sealing ring outside the motor end cover, and a sealed oil outlet cavity is formed by the sealing ring on the outer surface of the motor end cover, the sealing ring between the retainer ring and the mounting bracket and the inner cavity of the filter; fuel oil flows out from an oil outlet on the motor end cover and is gathered to the oil outlet cavity from the hollowed-out part of the mounting bracket; an oil drain port is arranged at the position of the filter, which is opposite to the oil outlet cavity, and can be connected with an external oil drain pipe, so that fuel output is realized.

In one embodiment of the present utility model, as shown in fig. 13 and 14, the pump head assembly includes a pump body and an impeller assembly, the impeller assembly being disposed inside the pump body; one end of the pump body is provided with an oil inlet 2, the other end of the pump body is provided with an oil outlet 3, the impeller assembly is arranged on the main shaft 1, and the excitation rotating assembly drives the impeller assembly to rotate through a coupler so as to suck fuel oil from the oil inlet 2 into the pump body and discharge the fuel oil through the oil outlet 3; the safety valve 16 which can be communicated with the oil inlet 2 and the oil outlet 3 is arranged in the pump body and is used for enabling fuel to flow back to the oil inlet end through the safety valve 16 for pressure relief when the oil pressure at the oil outlet end of the pump body is overlarge. The arrows in fig. 13 indicate the fuel in and out directions. The oil inlet and the oil outlet are respectively arranged at two ends of the pump body, and the oil pump can realize continuous large-flow oil supply under the continuous operation working condition; the safety valve is adopted to ensure that the internal pressure of the fuel pump does not exceed a set value, and when the internal pressure exceeds the set value, the safety valve is opened, so that the oil overflows from the oil outlet side to the oil inlet side, thereby playing a role in pressure protection.

In a specific embodiment of the present utility model, as shown in fig. 13 and 15-19, the pump body includes a pump end cover 4, a pump cavity 5 and a pump cavity upper cover 6 that are sequentially connected, the pump end cover 4, the pump cavity 5 and the inner cavity of the pump cavity upper cover 6 are through, the impeller assembly is disposed in the pump cavity 5, the pump end cover 4 and the pump cavity upper cover 6 are coincident with the central axis of the main shaft 1, and the lower end of the main shaft is fixed in the middle of the pump end cover 4; the inner cavity of the pump cavity 5 is cylindrical, and the central axis of the pump cavity is eccentrically arranged relative to the central axis of the main shaft 1; an oil inlet 2 is formed in one side of the pump end cover 4, and an oil suction hole 7 communicated with the pump cavity 5 is formed in the other side of the pump end cover 4. The impeller assembly comprises a pump impeller 8 and a plurality of rollers 9, wherein the pump impeller 8 is connected with the main shaft 1 through a shaft sleeve 10, and the rollers 9 are correspondingly arranged in grooves 11 on the circumferential cylindrical surface of the pump impeller 8. The pump impeller is arranged in the eccentric pump cavity, the excitation rotating assembly drives the pump impeller to rotate through the coupler after being electrified, the roller is tightly pressed on the inner surface of the pump cavity under the action of centrifugal force, and meanwhile, the roller is always tightly attached to one side face of the groove of the pump impeller under the action of inertia force, so that a sealed working cavity is formed. In the working process of the fuel pump, the working volume at one side of the oil inlet is increased to generate vacuum, so that a low-pressure oil suction cavity is formed, and fuel oil is sucked into the pump cavity through the oil inlet; the working volume is reduced at the oil outlet side to form a high-pressure oil cavity, and the pressurized fuel is discharged from the oil outlet.

In a specific design, as shown in fig. 15, a plurality of limiting grooves 12 for matching with the coupling 26 are formed on the inner hole wall of the pump impeller 8. When the pump impeller is installed, the rotor assembly is assembled on the main shaft, one end of the coupler is installed on the rotor assembly, and the other end of the coupler is inserted into the limit groove of the pump impeller. The rotor assembly, the coupling and the pump impeller form a rotating part. The lower end of the main shaft is fixed on the pump end cover through interference fit, the axial limit of the pump impeller is realized through the pump end cover and the pump cavity upper cover, and the radial limit of the roller is realized through the grooves around the pump impeller and the pump cavity.

As a preferable structure, as shown in fig. 13 and 17, the middle part of the pump chamber upper cover 6 is provided with an oil outlet 3, the outer shape of the pump chamber upper cover 6 is rectangular, two diagonal positions of the pump chamber upper cover 6 are provided with mounting holes matched with bolts 13, and the outer sides of the other two diagonal positions of the pump chamber upper cover 6 are provided with circular arc grooves 14 matched with the bolts 13. The structure can enable the pressurized fuel to be discharged from the middle oil outlet 3.

13, 14 and 16-18, the pump end cover 4, the pump cavity 5 and the pump cavity upper cover 6 are connected through 4 bolts 13; the diagonal positions of the pump end cover 4, the pump cavity 5 and the pump cavity upper cover 6 are respectively and fixedly connected through two long bolts, and the other two diagonal positions of the pump end cover 4 and the pump cavity 5 are respectively and fixedly connected through two short bolts. The short bolt 13 is arranged at the arc groove 14 of the pump cavity upper cover 6, the screw cap of the long bolt 13 is arranged at the top of the pump cavity upper cover 6, an oil discharge cavity is formed between the pump cavity upper cover and the excitation rotating assembly, and the oil outlet of the pump cavity upper cover is opposite to the oil inlet end of the fuel channel.

In a specific embodiment of the present utility model, as shown in fig. 13, 14 and 20, a liquid inlet cavity 15 is provided in the pump end cover 4, the oil inlet 2 is provided at an open end of the liquid inlet cavity 15, the safety valve 16 is provided in the pump end cover 4 at a side adjacent to the pump cavity 5, a valve cavity for accommodating the safety valve 16 is provided in the pump end cover 4, an oil return hole 17 penetrating through the pump cavity 5 is provided at a top of the valve cavity, and the safety valve 16 is used for returning fuel to the liquid inlet cavity 15 through the oil return hole 17 and the valve cavity when the oil pressure in the pump cavity 5 is too high, so as to achieve the purpose of pressure relief. The safety valve 16 comprises a plunger 161, a spring 162 and a valve cover 163, wherein a boss capable of blocking the oil return hole 17 is arranged at the top of the plunger 161, the spring 162 is sleeved outside the plunger 161, and an inner hole of the valve cover 163 is in sliding fit with the lower end of the plunger 161; the bottom of the valve cavity is provided with a clamping groove for fixing the valve cover 163, and a plurality of oil passing holes 160 for communicating the valve cavity with the liquid inlet cavity 15 are formed around the valve cover 163. The edge of the valve cover 163 is connected to its central body by a plurality of connection ribs 164, and the gap between adjacent connection ribs 164 forms the oil passing hole 160.

Further optimizing the above technical solution, as shown in fig. 16-18, the adjacent edges of the pump end cover 4, the pump cavity 5 and the pump cavity upper cover 6 are correspondingly provided with identification grooves 21. During assembly, the pump end cover 4, the pump cavity 5 and the pump cavity upper cover 6 are quickly and accurately installed by means of the identification groove 21.

In one embodiment of the present utility model, as shown in fig. 13, the oil inlet 2 of the pump end cover 4 is provided with a filter screen 18; the filter screen 18 is provided with crisscrossed reinforcing ribs 19. The filter screen can be reinforced by the reinforcing ribs. Meanwhile, the filter screen adopts a filter screen with 80 meshes, and can effectively filter solid foreign matters in fuel oil, thereby ensuring the cleanliness of the inside of the fuel pump and matched equipment thereof.

In the design process, the fluid component lines such as the pump end cover 4, the pump cavity 5, the pump impeller 8, the ball 9, the pump cavity upper cover 6 and the like are subjected to professional calculation, then simulation is performed through AnsysCFD software, and through optimal design, the surface smoothness of each fluid component is high, the gap control is reasonable, and the mechanical loss is small. The efficiency of the fuel pump is superior to that of domestic similar products.

During specific manufacturing, the pump cavity 5, the pump impeller 8, the shaft sleeve 10 and the oil-containing bearing 27 are all formed by adopting powder metallurgy, and the oil-immersed holes are filled because of the tiny holes, so that the oil-immersed holes can be operated for a period of time under no-load conditions, and the oil-immersed pump can not be damaged by dry grinding because of the self-lubricating effect.

In summary, the fuel pump provided by the utility model is composed of the brushless direct current motor and the pump head assembly, has the characteristics of high efficiency, small volume, light weight, large flow, low noise, long service life, high safety, high cleanliness and the like, and can realize continuous fuel supply under continuous operation working conditions by arranging the inlet and the outlet of the fuel at two ends of the fuel pump; meanwhile, the safety valve is utilized to enable the internal pressure of the fuel pump not to exceed a set value, after the internal pressure exceeds the set value, the safety valve is opened, and oil overflows from the oil outlet side to the oil inlet side, so that the pressure protection function is achieved, and the parts in the pump body are protected from being damaged due to the fact that the pressure is too high.

In the foregoing description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, but the present utility model may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present utility model is not limited to the specific embodiments disclosed above.

Claims (10)

1. An excitation rotating assembly usable in a fuel environment, characterized by: the excitation rotating assembly comprises a motor shell, a rotor assembly and a stator assembly, wherein the rotor assembly and the stator assembly are arranged in the motor shell, the stator assembly is fixed in the motor shell, the rotor assembly is sleeved on a main shaft of the fuel pump, the stator assembly is arranged outside the rotor assembly, and a gap is arranged between the rotor assembly and the stator assembly; the upper end of the main shaft and the upper end of the stator assembly are connected with the motor end cover, the stator assembly can be electrically connected with a controller outside the motor end cover, and the motor shell, the rotor assembly, the stator assembly, the motor end cover and the controller are assembled into a brushless direct current motor; the lower end of the rotor assembly is connected with the pump head assembly; the stator assembly and the rotor assembly are internally provided with fuel channels for fuel to pass through, the inlets at the lower ends of the fuel channels are communicated with the oil outlets of the pump head assemblies, and the outlets at the upper ends of the fuel channels are communicated with oil outlets at the junction of the motor end cover and the motor shell.

2. The excitation rotating assembly usable in an oil environment as set forth in claim 1, wherein: the lower extreme of rotor assembly passes through the shaft coupling and links to each other with the pump head subassembly for the impeller assembly in the drive pump head subassembly is rotatory, the both ends of rotor assembly all are equipped with the oiliness bearing, oiliness bearing is interference fit with the rotor assembly.

3. The excitation rotating assembly usable within a fuel environment as set forth in claim 2, wherein: the rotor assembly comprises a rotor core and a magnet; the stator assembly comprises an injection molding shell and a stator core and a winding inside the injection molding shell; the inner wall of the injection molding shell is provided with a plurality of oil passing grooves, and the injection molding shell is provided with a fuel oil channel formed by the oil passing grooves and gaps between the stator core and the rotor core.

4. The excitation rotating assembly usable within a fuel environment as set forth in claim 2, wherein: the upper packaging part of the stator assembly is connected with a controller through a conductor, the controller is arranged in a cavity between the motor end cover and the connector end cover, the motor end cover is connected with the connector end cover in a sealing way, and a power interface connected with a power line is arranged on the side surface of the connector end cover; the bottom of the motor end cover is provided with convex eaves which are connected with the motor shell around.

5. The excitation rotating assembly usable in an oil environment as set forth in claim 4, wherein: the conductor is split type structure, be equipped with conductor one and conductor two in upper packaging part and the motor end cover respectively, the lower extreme of conductor one is connected with the winding electricity, and the upper end is connected with conductor two's lower extreme electricity through the plug spring terminal, conductor two's upper end is connected with the controller electricity.

6. The excitation rotating assembly usable in an oil environment as set forth in claim 4, wherein: a sealing ring is arranged on the matching surface of the motor end cover and the connector end cover; the connector end cover is connected with the edge of the motor end cover through a clamping structure, and the clamping structure is arranged on the outer side of the sealing ring; the clamping structure comprises clamping grooves and positioning protruding blocks, the clamping grooves are arranged on the bottom surface of the connector end cover at intervals, inner barbs are arranged on the inner wall of the clamping grooves, a plurality of positioning protruding blocks matched with the clamping grooves are correspondingly arranged on the top surface of the motor end cover, and outer barbs matched with the inner barbs are arranged on the side surfaces of the positioning protruding blocks.

7. A fuel pump, characterized in that: the pump head assembly and the excitation rotating assembly are arranged in the pump shell from bottom to top; a sealing ring is arranged between the lower end of the pump head assembly and the pump shell, and a filter screen is arranged at the oil inlet of the lower end of the pump head assembly.

8. The fuel pump of claim 7 wherein: the pump shell is connected with the motor end cover by spin riveting, one end of the motor end cover, which is connected with the pump shell, is a conical inclined surface protruding outwards, the tail end of the pump shell is a conical spin riveting surface matched with the inclined surface, the spin riveting surface is provided with a punch riveting point, and the inclined surface of the motor end cover is provided with a punch riveting reserved hole corresponding to the punch riveting point.

9. The fuel pump of claim 7 wherein: the outside of the pump shell is provided with a mounting bracket with a frame type structure, the mounting bracket is correspondingly arranged on the outer side of the excitation rotating assembly, and a plurality of hollowed-out areas are formed at the upper part of the mounting bracket, which corresponds to the junction of the motor end cover and the motor shell, and are used for discharging fuel flowing out of the fuel channel; a sealing groove for installing a sealing ring is arranged on the outer surface of the lower part of the motor end cover; the upper end of the mounting bracket is abutted with the lower end face of the outer side of the motor end cover, a check ring is arranged at the lower end of the mounting bracket, and a sealing ring is arranged between the check ring and the mounting bracket.

10. The fuel pump of claim 7 wherein: the pump head assembly comprises a pump body and an impeller assembly, the pump body comprises a pump end cover, a pump cavity and a pump cavity upper cover which are sequentially connected, the inner cavities of the pump end cover, the pump cavity and the pump cavity upper cover are communicated, the impeller assembly is arranged in the pump cavity and on a main shaft, the lower end of the main shaft is fixed in the middle of the pump end cover, the pump end cover and the pump cavity upper cover are coincident with the central axis of the main shaft, and the inner cavity of the pump cavity is cylindrical, and the central axis of the pump cavity is eccentrically arranged relative to the central axis of the main shaft; an oil inlet is formed in one side of the pump end cover, and an oil outlet communicated with the pump cavity is formed in the pump cavity upper cover; the pump end cover is internally provided with a valve cavity for accommodating the safety valve, and the top of the valve cavity is provided with an oil return hole communicated with the high-pressure area of the pump cavity body and used for returning fuel oil to the oil inlet end of the pump end cover for pressure relief through the safety valve when the oil pressure in the pump cavity body is overlarge;

the impeller assembly comprises a pump impeller and a plurality of rollers, the pump impeller is in running fit with the main shaft through a shaft sleeve, the rollers are correspondingly arranged in grooves on the cylindrical surface around the pump impeller, and a plurality of limiting grooves for being matched with the coupler are formed in the inner hole wall of the pump impeller; the excitation rotating assembly drives the impeller assembly to rotate through the coupler to suck fuel oil into the pump body from the oil inlet and discharge the fuel oil through the oil outlet.