CN211174422U

CN211174422U - Novel small-size external fuel pump

Info

Publication number: CN211174422U
Application number: CN201921244052.8U
Authority: CN
Inventors: 孙国庆; 邵杨; 王磊
Original assignee: Ningbo Rocket Automobile Parts Co ltd
Current assignee: Ningbo Rocket Automobile Parts Co ltd
Priority date: 2019-08-02
Filing date: 2019-08-02
Publication date: 2020-08-04
Anticipated expiration: 2029-08-02

Abstract

The utility model discloses a novel small-size external fuel pump relates to engine accessories technical field, include: the fuel pump comprises an upper cover body and a lower shell, wherein a fuel pump cavity is formed between the upper cover body and the lower shell, the upper part of the upper cover body is provided with an oil inlet pipe, an exhaust pipe and an oil outlet pipe which are communicated with the fuel pump cavity, the upper cover body is also provided with an oil return pipe, the fuel pump cavity is also internally provided with a floater sealing assembly, a pressure valve assembly communicated with the oil return pipe, a pump body used for pumping oil in the fuel pump out of the oil outlet pipe, and an exhaust sealing assembly used for controlling the opening and closing of; the floater sealing assembly comprises a needle valve, a connecting plate, a rotating shaft core and a floater body, the lower part of the upper cover body is also provided with an axis support, and the rotating shaft core is arranged on the axis support; the exhaust seal assembly includes ball sealer, ball seat and sets up the exhaust support in the mouth of pipe department of blast pipe, and it is fixed that the ball seat passes through exhaust support, the utility model discloses a fuel pump simple structure has reduced the volume of fuel pump greatly to use safe and reliable.

Description

Novel small-size external fuel pump

Technical Field

The utility model belongs to the technical field of the engine accessory technique and specifically relates to a novel small-size external fuel pump.

Background

In recent years, many engine manufacturers have developed and used turbine-type fuel pumps for supplying fuel to internal combustion engines; turbo pumps are preferred over most conventional fuel pumps employing gerotors or rotating vane members because they are generally more efficient and less expensive to manufacture, and are typically located within a fuel tank, but in-tank turbo fuel pumps are not particularly well suited for small utility engine applications; unlike manufacturers in the automotive or power transportation industry, small utility engine manufacturers often attempt to use fuel systems that can be universally employed on a wide range of different types of engines, as well as fuel systems that are applicable to both carbureted engines and engines employing EFI systems; however, the common turbine fuel pump has low universality in different engines and vehicles of the same type; small utility engine manufacturers typically rely on inline fuel pumps located outside the fuel tank in place of in-tank turbine fuel pumps.

Inline fuel pumps located outside of the fuel tank have other disadvantages associated with the use of inline pumps in these applications; first, it is often necessary to regulate the pressure of the fuel output of the fuel pump through the use of a pressure regulator, complicating the design of the fuel delivery system, and also to provide a return fuel line to couple the pressure regulator back to the fuel tank, thereby allowing fuel exiting the regulator to be returned to the fuel tank, potentially reducing the useful life and reliability of the fuel tank; accordingly, for at least these reasons, there is a need for an improved engine-mounted fuel delivery system that is particularly well suited for use in conjunction with small utility engines, has good versatility, and has reduced requirements imposed on the associated engine or vehicle electrical system by such an improved engine-mounted fuel delivery system.

A fuel pump as disclosed in chinese utility model patent CN 205503322U. The fuel pump comprises a fuel pump body, wherein an oil inlet is connected with a fuel tank, an oil outlet is connected with a fuel supply system, a fuel reflux device is further arranged on one side of the fuel pump body, the fuel reflux device comprises a reflux cavity fixedly connected with the fuel pump body and a heat dissipation mechanism arranged in the reflux cavity, a reflux inlet in conduction connection with the fuel supply system and a reflux outlet in conduction connection with the fuel tank are respectively arranged at two ends of the reflux cavity, and a check valve is arranged at the reflux inlet in the reflux cavity; the utility model discloses a fuel pump of patent is bulky, and the installation commonality is not strong, and the security performance can not satisfy higher and higher operation requirement to can not the automatically regulated pump internal pressure.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the above-mentioned defect that prior art exists, specially provide a novel small-size external fuel pump, it is great to solve the volume that current fuel pump exists, and the not strong problem of commonality has still solved the lower problem of current fuel pump security.

In order to solve the technical problem, the utility model provides a novel small-size external fuel pump, include: the fuel pump comprises an upper cover body and a lower shell, wherein a fuel pump cavity is formed between the upper cover body and the lower shell, an oil inlet pipe, an exhaust pipe and an oil outlet pipe which are communicated with the fuel pump cavity are arranged at the upper part of the upper cover body, an oil return pipe is also arranged on the upper cover body, one end of the oil return pipe is communicated with the fuel pump cavity, the other end of the oil return pipe is communicated with the middle part of the oil outlet pipe, a float seal assembly, a pressure valve assembly communicated with the oil return pipe, a pump body used for pumping oil in the fuel pump out of the oil outlet pipe and an exhaust seal assembly;

the floater sealing assembly comprises a needle valve, a connecting plate, a rotating shaft core and a floater body, wherein the floater body is fixed at one end of the connecting plate, the other end of the connecting plate is hinged with the rotating shaft core, one end of the needle valve is matched with a needle valve seat arranged in an oil inlet pipe and used for controlling the opening and closing of the oil inlet pipe, the other end of the needle valve is connected with the middle part of the connecting plate, an axis support is further arranged at the lower part of the upper cover body, and the rotating shaft;

exhaust seal assembly includes ball sealer, ball seat and sets up the exhaust support in the pipe orifice department of blast pipe, and it is fixed that the ball seat passes through exhaust support, and the ball sealer setting adopts above-mentioned technical scheme in the accommodation space of ball seat and exhaust support formation, the utility model discloses a fuel pump simple structure has reduced the volume of fuel pump greatly to use safe and reliable.

Wherein, the needle valve bottom is equipped with the draw-in groove, is equipped with bayonet socket and baffle on the connecting plate, and the needle valve passes through the cooperation joint of draw-in groove and bayonet socket with the connecting plate, and the baffle is located pivot core upper portion, adopts above-mentioned technical scheme can effectually to control the open and close state of needle valve through the float body.

The pressure valve assembly comprises a pressure valve body, a pressure valve filter screen arranged on the upper portion of the pressure valve body and a pressure valve cap used for fixing the pressure valve body.

The pump body comprises an oil outlet nozzle sealing ring, a pump core and a filter screen, wherein the oil outlet nozzle sealing ring is arranged at the upper part of the pump core and used for sealing the joint of the pump core and an oil outlet pipe; the top of the pump core is provided with a metal pin which is inserted and matched with a pin penetrating through the upper cover body.

The pressure valve body is in a normally closed state before the oil pressure in the oil outlet pipe reaches a preset pressure, when the oil pressure in the oil outlet pipe exceeds the preset pressure, the pressure valve body is opened, and partial oil in the oil outlet pipe flows back to the fuel pump cavity through the oil return pipe, the pressure valve filter screen and the opened pressure valve.

Wherein, a sealing strip is arranged between the upper cover body and the lower cover body, and the sealing strip and the oil outlet nozzle sealing ring are made of rubber; the upper cover body and the lower shell are fixedly connected through self-tapping screws, and the upper cover body and the lower shell are made of engineering plastics; at least one extended mounting plate is provided on the outside of the lower housing for mounting the fuel pump to the engine.

Wherein, the pump core top still is equipped with participates in the sheath, participates in the sheath and is used for the metal to participate in with the fixed of pin, participates in and is equipped with two cross through-holes on the sheath, is equipped with vertical open slot in the middle of the pin, and the metal is participated in and is inserted in the cross through-hole with the pin mutually perpendicular, and the joint is participated in the vertical open slot of pin to the metal.

Drawings

FIG. 1 is a perspective view of a novel small external fuel pump of the present invention;

fig. 2 is an exploded view of a novel external fuel pump 1 according to the present invention;

FIG. 3 is an exploded view of a novel external fuel pump of the present invention, schematically illustrated in FIG. 2;

FIG. 4 is a schematic view of a pressure valve assembly of a novel external fuel pump of the present invention;

FIG. 5 is a schematic view of a float seal assembly of a novel small external fuel pump of the present invention;

FIG. 6 is a schematic diagram of a pump body of a novel small external fuel pump according to the present invention;

fig. 7 is a schematic view of an upper cover of a novel small external fuel pump according to the present invention;

in the figure: 1 is an upper cover body; 2 is a lower shell; 3 is an oil inlet pipe; 4 is an oil return pipe; 5 is an exhaust pipe; 6 is an oil outlet pipe; 7 is a float sealing component; 8 is a pressure valve assembly; 9 is a pump body; 10 is an exhaust sealing component; 11 is a needle valve; 12 is a connecting plate; 13 is a rotating shaft core; 14 is a floater body; 15 is an axis bracket; 16 is a pressure valve filter screen; 17 is a pressure valve body; 18 is a pressure bonnet; 19 is a sealing ball; 20 is a ball seat; 21 is an oil nozzle sealing ring; 22 is a pump core; a filter screen 23; 24 is a pin sheath; 25 is a sealing strip; 26 is a mounting plate; 28 is a clamping groove; 29 is a bayonet; 30 is a baffle plate; 31 is a needle valve seat; 32 is an exhaust bracket; 34 is a pin; and 35 is a pin.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

Example 1:

the utility model discloses a novel small-size external fuel pump, as shown in fig. 1 to 7, include: the fuel pump comprises an upper cover body 1 and a lower cover body 2, wherein a fuel pump cavity is formed between the upper cover body 1 and the lower cover body 2, an oil inlet pipe 3, an exhaust pipe 5 and an oil outlet pipe 6 which are communicated with the fuel pump cavity are arranged at the upper part of the upper cover body 1, an oil return pipe 4 is also arranged on the upper cover body 1, one end of the oil return pipe 4 is communicated with the fuel pump cavity, the other end of the oil return pipe 4 is communicated with the middle part of the oil outlet pipe 6, a float seal assembly 7, a pressure valve assembly 8 communicated with the oil return pipe 4, a pump body 9 for pumping oil in the fuel pump out of the oil outlet pipe 6 and an exhaust seal assembly 10 for;

as shown in fig. 1, the pressure valve assembly 8 is arranged at a communication port of the oil return pipe 4 and the fuel pump cavity, and the pressure valve assembly 8 comprises a pressure valve body 17, a pressure valve screen 16 arranged at the upper part of the pressure valve body 17, and a pressure bonnet 18 for fixing the pressure valve body 17; specifically, the pressure valve assembly 8 is to keep the oil pressure in the oil outlet pipe 6 stable, that is, the pressure valve body 17 is in a normally closed state before the oil pressure in the oil outlet pipe 6 reaches a predetermined pressure, when the oil pressure in the oil outlet pipe 6 exceeds the predetermined pressure, the pressure valve body 17 is opened, part of the oil in the oil outlet pipe 6 flows back into the fuel pump cavity through the oil return pipe 4, the pressure valve strainer 16 and the opened pressure valve, so as to ensure the oil pressure in the oil outlet pipe 6 to be stable, the pressure valve strainer 16 plays a role in filtering, and the pressure valve cap 18 is clamped at the bottom of the upper cover body 1 through a buckle, so as to fix the pressure valve strainer 16 and the pressure valve body 17 at a communication port between the oil return pipe 4 and the fuel pump cavity.

As shown in fig. 5, the float seal assembly 7 includes a needle valve 11, a connecting plate 12, a rotating shaft core 13 and a float body 14, the float body 14 is fixed at one end of the connecting plate 12, the other end of the connecting plate 12 is hinged to the rotating shaft core 13, one end of the needle valve 11 is matched with a needle valve seat 31 arranged in the oil inlet pipe 3, the needle valve 11 is used for controlling the opening and closing of the oil inlet pipe 3, the other end of the needle valve 11 is connected with the middle part of the connecting plate 12, the lower part of the upper cover 1 is further provided with an axle center bracket 15, the rotating shaft core 13 is arranged on the axle center bracket 15, specifically, the float body 14 is a hollow plastic piece with a certain volume, when the oil in the fuel pump cavity reaches a certain liquid level height, the float body 14 floats on the oil under the action of its own buoyancy, at this time, the float body 14 floats up, the other end of the connecting plate 12 is hinged with the rotating shaft core 13, so that the up-and-down floating of the floater body 14 can drive the connecting plate 12 to rotate around the rotating shaft core 13, the needle valve 11 is vertically arranged, the bottom end of the needle valve 11 is connected with the middle part of the connecting plate 12, when the connecting plate 12 rotates around the rotating shaft core 13, the needle valve 11 can also move up and down under the driving of the connecting plate 12, when the liquid level of oil in the cavity of the fuel pump reaches a certain height, the needle valve 11 is upwards inserted into the needle valve seat 31 to realize sealing, the oil inlet pipe 3 is closed, and oil cannot enter the;

as shown in fig. 3 and 7, the exhaust sealing assembly 10 includes a sealing ball 19, a ball seat 20, and an exhaust support 32 disposed at a pipe orifice of the exhaust pipe 5, the ball seat 20 is fixed by the exhaust support 32, and the sealing ball 19 is disposed in a receiving space formed by the ball seat 20 and the exhaust support 32, specifically, the exhaust sealing assembly 10 can be used to block an exhaust port of the exhaust pipe 5 in a fuel pump cavity, so as to prevent oil in the fuel pump cavity from leaking out of the exhaust pipe 5 when the fuel pump is turned upside down or upside down.

As shown in fig. 5, a clamping groove 28 is further provided at the bottom of the needle valve 11, a bayonet 29 and a baffle 30 are provided on the connecting plate 12, the needle valve 11 and the connecting plate 12 are clamped by the clamping groove 28 and the bayonet 29 in a matching manner, so that an effect that the connecting plate 12 drives the needle valve 11 to move up and down is achieved, the baffle 30 is located at the upper portion of the rotating shaft core 13, the baffle 30 can also rotate along with the rotation of the connecting plate 12, in a process of reducing oil in the fuel pump cavity, the position of the float body 14 can also continuously descend, meanwhile, the baffle 30 on the connecting plate 12 can also rotate upwards, when the liquid level is lower than a preset liquid level, the baffle 30 on the connecting plate 12 rotates to abut against the wall of the oil inlet pipe 3 extending into the fuel pump cavity, so that the connecting plate 12 is not rotated, that the.

A sealing strip 25 is arranged between the upper cover body 1 and the lower cover body 2, and the sealing strip 25 and the oil nozzle sealing ring 21 are made of rubber and used for ensuring that oil in the fuel pump cannot flow out; the upper cover body 1 and the lower cover body 2 are connected and fixed through self-tapping screws or connected through other common fasteners, such as bolts and screws, and the upper cover body 1 and the lower cover body 2 are made of engineering plastics, such as PPA + GF40 or POM; at least one projecting mounting plate 26 is provided on the outside of the lower housing 2, the mounting plate 26 being used to mount the fuel pump to the engine.

Example 2:

compare in embodiment 1, in embodiment 2, the pump body 9 includes glib sealing washer 21, pump core 22 and filter screen 23, glib sealing washer 21 sets up in pump core 22 upper portion, glib sealing washer 21 is used for the sealed of pump core 22 and play oil pipe 6 junction, filter screen 23 sets up in pump core 22 lower part, filter screen 23 is used for filtering the fluid that gets into pump core 22, and filter screen 23 material is PA, filter screen 23's minimum filter particle 15um, efficiency > 90%, filter screen 23's effective filter area 40cm²Specifically, one part of the filter screen 23 is fixed at the bottom of the pump core 22, and the other part of the filter screen is folded and arranged at the side part of the pump core 22, so that the filtering area is increased, and meanwhile, the filtering effect is effectively improved.

The top of the pump core 22 is provided with a metal pin 34, and the metal pin 34 is inserted and matched with a pin 35 penetrating through the upper cover body 1 for circuit connection of the pump core 22.

Example 3:

compared with the embodiment 2, in the embodiment 3, the top of the pump core 22 is further provided with the pin sheath 24, the pin sheath 24 is used for fixing the metal pin 34 and the pin 35, the pin sheath 24 is provided with two cross-shaped through holes, a vertical open slot is formed in the middle of the pin 35, the metal pin 34 and the pin 35 are perpendicularly inserted into the cross-shaped through holes, the metal pin 34 is clamped in the vertical open slot of the pin 35, specifically, the metal pin 34 and the pin 35 are possibly separated from each other in the insertion process, and the reliable insertion of the metal pin 34 and the pin 35 can be effectively ensured through the arrangement of the pin sheath 24.

In a specific use process, after an engine fuel system is powered on, a fuel pump starts to supply fuel, and the pressure of the system rises; when the fuel pressure in the oil outlet pipe 6 is increased to the specified pressure, the valve ball is separated from the valve by overcoming the spring elasticity of the pressure valve, and the redundant fuel is sent back to the cavity of the fuel pump to keep the constant pressure; along with the closing of the power supply, the fuel pump stops supplying fuel, so that the pressure of the system is instantly reduced, and the pressure valve is in a closing and pressure maintaining state at the moment.

Compare in traditional inline fuel pump, this section neotype small-size external fuel pump has following characteristics: the versatility is strong, and the engine is easier to be used in combination with various types of engines and/or associated vehicles; smaller in size, the demands imposed on the associated engine or vehicle electronic system are reduced. The utility model provides a novel small-size external fuel pump, through compact structural design, make the whole size of fuel pump less, and the requirement imposed on the electronic system of the associated engine or vehicle is reduced, and the commonality is strong, is easier to use with various types of engines in combination; meanwhile, the automatic control function of the float sealing assembly 7, the safety function of the exhaust sealing assembly 10 and the function of the pressure valve body 17 for maintaining pressure balance greatly improve the overall safety and reliability of the fuel pump.

The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a novel small-size external fuel pump which characterized in that, novel small-size external fuel pump includes: the fuel pump comprises an upper cover body (1) and a lower cover body (2), a fuel pump cavity is formed between the upper cover body (1) and the lower cover body (2), an oil inlet pipe (3), an exhaust pipe (5) and an oil outlet pipe (6) which are communicated with the fuel pump cavity are arranged on the upper portion of the upper cover body (1), a return oil pipe (4) is further arranged on the upper cover body (1), one end of the return oil pipe (4) is communicated with the fuel pump cavity, the other end of the return oil pipe (4) is communicated with the middle of the oil outlet pipe (6), a float sealing assembly (7), a pressure valve assembly (8) communicated with the return oil pipe (4), a pump body (9) used for pumping oil in the fuel pump out of the oil outlet pipe (6), and an exhaust sealing assembly (10) used for controlling the exhaust pipe (5) to;

the float sealing assembly (7) comprises a needle valve (11), a connecting plate (12), a rotating shaft core (13) and a float body (14), the float body (14) is fixed at one end of the connecting plate (12), the other end of the connecting plate (12) is hinged to the rotating shaft core (13), one end of the needle valve (11) is matched with a needle valve seat (31) arranged in the oil inlet pipe (3) to be used for controlling the opening and closing of the oil inlet pipe (3), the other end of the needle valve (11) is connected with the middle of the connecting plate (12), an axle center support (15) is further arranged at the lower part of the upper cover body (1), and the rotating shaft core (13) is arranged on the axle center support (15);

the exhaust sealing assembly (10) comprises a sealing ball (19), a ball seat (20) and an exhaust support (32) arranged at the opening of the exhaust pipe (5), the ball seat (20) is fixed through the exhaust support (32), and the sealing ball (19) is arranged in a containing space formed by the ball seat (20) and the exhaust support (32).

2. The novel small external fuel pump according to claim 1, wherein a clamping groove (28) is formed at the bottom of the needle valve (11), a bayonet (29) and a baffle (30) are formed on the connecting plate (12), the needle valve (11) and the connecting plate (12) are clamped through the matching of the clamping groove (28) and the bayonet (29), and the baffle (30) is located at the upper part of the rotating shaft core (13).

3. The novel external fuel pump of claim 1, wherein the pressure valve assembly (8) comprises a pressure valve body (17), a pressure valve screen (16) disposed on the upper portion of the pressure valve body (17), and a pressure bonnet (18) for fixing the pressure valve body (17).

4. The novel small external fuel pump according to claim 1, wherein the pump body (9) includes a nozzle seal ring (21), a pump core (22) and a strainer (23), the nozzle seal ring (21) is disposed on the upper portion of the pump core (22), the nozzle seal ring (21) is used for sealing the connection between the pump core (22) and the fuel outlet pipe (6), the strainer (23) is disposed on the lower portion of the pump core (22), and the strainer (23) is used for filtering oil entering the pump core (22).

5. The novel small external fuel pump as set forth in claim 4, characterized in that the top of the pump core (22) is provided with metal pins (34), and the metal pins (34) are inserted and matched with pins (35) penetrating the upper cover body (1).

6. The novel small external fuel pump according to claim 3, wherein the pressure valve body (17) is in a normally closed state before the pressure of the oil in the oil outlet pipe (6) reaches a predetermined pressure, and when the pressure of the oil in the oil outlet pipe (6) exceeds the predetermined pressure, the pressure valve body (17) is opened, and a part of the oil in the oil outlet pipe (6) flows back into the fuel pump cavity through the oil return pipe (4), the pressure valve screen (16) and the opened pressure valve.

7. The novel small external fuel pump according to claim 1, wherein a sealing strip (25) is arranged between the upper cover body (1) and the lower casing (2), and the sealing strip (25) and the nozzle sealing ring (21) are made of rubber.

8. The novel small-sized external fuel pump according to claim 1, wherein the upper cover body (1) and the lower housing (2) are connected and fixed through self-tapping screws, and the upper cover body (1) and the lower housing (2) are made of engineering plastics.

9. A new compact external fuel pump according to claim 1, characterized in that said lower housing (2) is provided on the outside with at least one projecting mounting plate (26), said mounting plate (26) being adapted to mount the fuel pump to the engine.

10. The novel small-sized external fuel pump according to claim 5, wherein a pin sheath (24) is further arranged at the top of the pump core (22), the pin sheath (24) is used for fixing the metal pin (34) and the pin (35), two cross-shaped through holes are formed in the pin sheath (24), a vertical open slot is formed in the middle of the pin (35), the metal pin (34) and the pin (35) are perpendicularly inserted into the cross-shaped through holes, and the metal pin (34) is clamped in the vertical open slot of the pin (35).