CN113309647A - Small external fuel pump with roll protection - Google Patents

Abstract

The invention provides a small external fuel pump with side-tipping protection, which comprises an upper cover body, a lower shell, a tipping valve and a pump body, wherein the upper cover body and the lower shell are covered to form an inner cavity; the turnover valve comprises a valve cover, a valve core and a valve spring, wherein the valve cover is arranged on the valve hole groove and comprises an exhaust pipe; one end of the valve spring is connected with the groove bottom surface of the valve hole groove, the other end of the valve spring is connected with one end of the valve core, and the other end of the valve core is movably connected with the inner surface of the valve cover. The roll-over valve is convenient to install, can not leak oil when being tilted, and avoids leakage from the exhaust port due to excessive fuel.

Description

Small external fuel pump with roll protection

Technical Field

The invention relates to an engine fuel supply device, in particular to a small external fuel pump with a side-tipping protection function, which is arranged in an engine fuel supply system.

Background

With the development of science and technology and the advancement of technology, engine products are changing day by day, and higher requirements are also put on fuel supply products. 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; common turbine fuel pumps are less versatile in different types of engines and vehicles; small utility engine manufacturers typically rely on inline fuel pumps located outside the fuel tank in place of in-tank turbine fuel pumps.

The prior art external fuel pumps located outside the fuel tank have other disadvantages associated with these applications: fuel may leak from the exhaust port, especially if the roll exceeds 40 degrees. This drawback becomes increasingly unacceptable today with increasingly stringent environmental requirements.

Thus, there is also a lifting place for small external fuel pumps of the prior art.

Disclosure of Invention

In view of the above-mentioned drawbacks, the present invention provides a small external fuel pump with a roll protection device, which is easy to install and does not leak oil when rolling, so as to solve the technical problems of the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme:

a small external fuel pump with side-tipping protection comprises an upper cover body, a lower shell, a tipping valve and a pump body, wherein the upper cover body and the lower shell are covered to form an inner cavity; the turnover valve comprises a valve cover, a valve core and a valve spring, wherein the valve cover is arranged on the valve hole groove and comprises an exhaust pipe; one end of the valve spring is connected with the groove bottom surface of the valve hole groove, the other end of the valve spring is connected with one end of the valve core, and the other end of the valve core is movably connected with the inner surface of the valve cover.

According to the small external fuel pump with the side-tipping protection function, the valve core comprises a sealing gasket, an upper valve core and a lower valve core, a ventilation through hole is formed in the middle of the sealing gasket, and the sealing gasket is arranged on the upper valve core; the upper valve core is arranged on the lower valve core in a limiting mode, the upper valve core moves in a limiting range, and the sealing gasket is movably connected with the inner surface of the valve cover.

According to the preferred embodiment of the application, the small external fuel pump with the roll protection function further comprises a shock pad, the shock pad is arranged on the bottom surface of the valve hole groove, and the shock pad comprises a middle through hole.

According to the small-size external fuel pump of area roll protection of this application preferred embodiment, still include float, needle valve, filter screen and pressure valve, float, needle valve, filter screen and pressure valve set up in the inner chamber.

The technical scheme of the application improves the existing series of small external fuel pumps, designs a small external fuel pump with a roll protection device which is convenient to install and can not roll and leak oil, and prevents fuel oil in a fuel pump cavity from leaking from an exhaust port through the compact structural design and the roll-over prevention function of a roll-over valve (commonly called an ROV valve) and the control oil inlet amount function of a float and a needle valve, thereby improving the integral environmental protection and reliability of the fuel pump; meanwhile, the fuel pump is small in overall size, high in universality and easy to combine with various engines.

Due to the adoption of the technical characteristics, compared with the prior art, the invention has the following advantages and positive effects:

firstly, the turnover valve is convenient to install, and can not leak oil when being tilted;

secondly, the fuel pump is guaranteed to pump oil continuously, and leakage of the fuel from the exhaust port due to excessive fuel is avoided.

Of course, it is not necessary for any particular embodiment of the inventive concept to be implemented to achieve all of the above technical effects at the same time.

Drawings

FIG. 1 is a schematic external view of a fuel pump according to the present application;

FIG. 2 is a exploded view of the fuel pump of the present application;

FIG. 3 is an enlarged view of a portion of FIG. 2;

FIG. 4 is a schematic view of a cartridge of the present application;

FIG. 5 is a schematic view of the pump body of the present application;

FIG. 6 is a schematic view of the present application in vertical section;

FIG. 7 is a cut-away schematic view of the tilt of the roll-over valve of the present application;

FIG. 8 is an external view of the fuel pump according to the present application in an inclined state.

Detailed Description

Several preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to only these embodiments. The invention is intended to cover alternatives, modifications, equivalents, and alternatives that may be included within the spirit and scope of the invention. In the following description of the preferred embodiments of the present invention, specific details are set forth in order to provide a thorough understanding of the present invention, and it will be apparent to those skilled in the art that the present invention may be practiced without these specific details. In other instances, well-known methods, procedures, components, and so forth have not been described in detail so as not to unnecessarily obscure aspects of the present invention.

Referring to fig. 1 and 2, the fuel pump of the present application is shown in an external view and exploded; the fuel pump is a small external fuel pump with side-tipping protection, and comprises an upper cover body 10, a lower cover body 20, a turnover valve 30 and a pump body 40, wherein the upper cover body 10 and the lower cover body 20 are covered to form an inner cavity, and the upper cover body 10 comprises an oil outlet pipe 11 and an oil inlet pipe 12; the pump body 40 is disposed in the inner cavity, an oil outlet 41 of the pump body 40 is communicated with the oil outlet pipe 11, and in fig. 5, a check valve 42 is disposed in the oil outlet 41 of the pump body 40, and the check valve 42 prevents the fuel from flowing back to the pump body 40 from the oil outlet 41.

As shown in fig. 2, the upper cover body 10 is provided with a valve hole groove 13 protruding from the surface, an opening of the valve hole groove 13 is an annular body, and a through hole is formed in the bottom surface of the valve hole groove 13 and used for discharging oil gas in the inner cavity; the roll-over valve 30 is arranged in the valve hole groove 13; the rollover valve 30 comprises a valve cover 31, a valve core 32 and a valve spring 33, wherein the valve cover 31 comprises an exhaust pipe 311, oil gas in an inner cavity is discharged through the exhaust pipe 311, the valve cover 31 is arranged on the valve hole groove 13, in the embodiment of the application, as shown in fig. 6, a buckle hole 312 is formed in the valve cover 31, a buckle 131 is arranged on the groove wall of the valve hole groove 13, during assembly, the buckle 131 enters the buckle hole 312, the valve cover 31 is buckled on the valve hole groove 13, and a sealing ring is arranged on the outer surface of the valve hole groove 13, so that the sealing performance of connection between the valve cover and the valve hole groove is ensured, but the valve cover 31 cannot be used for limiting the application, for example, the valve cover 31 is in threaded connection with the valve hole groove 13, and the valve cover 31 can be stably connected with the valve hole groove 13 as long as the valve cover can be stably connected with the valve hole groove.

In addition, the valve spring 33 is disposed in the valve hole groove 13, one end of the valve spring 33 is connected to the groove bottom surface of the valve hole groove 13, the other end of the valve spring 33 is connected to one end of the valve core 32, and the other end of the valve core 32 is movably connected to the inner surface of the valve cover 31, as shown in fig. 3, in the embodiment of the present application, a protrusion is disposed in the middle of the valve core 32, so that the valve spring 33 is abutted and connected. The valve spring 33 is used for supporting the valve core 32, and when the fuel pump inclines at an angle greater than or equal to 40 degrees, the valve core 32 is abutted against the nozzle of the exhaust pipe 311, and the fuel is prevented from leaking.

As shown in fig. 3, 4, 6 and 7, the valve element 32 includes a sealing gasket 321, an upper valve element 322 and a lower valve element 323, the sealing gasket 321 is disposed on the upper valve element 322, the upper valve element 322 is disposed on the lower valve element 323 in a limited range, the sealing gasket 321 is movably connected to the inner surface of the valve cover 31, in fig. 4, the sealing gasket 321 includes a sealing plane 3211 and a connecting post 3212, a sealing ring groove 32121 is disposed on the connecting post 3212, the upper valve element 322 includes a valve element surface 3221 and four valve element posts 3222, the end of the valve element post 3222 is in a barb shape, the valve element surface 3221 is a plane with a through hole in the middle, and after assembly, the sealing ring groove 32121 is connected to the middle through hole of the valve element surface 3221, so that the sealing gasket 321 is firmly clamped on the upper valve element 322; one end of the lower valve core 323 close to the upper valve core 322 comprises a valve core clamping ring groove 3231, after assembly, four valve core clamping columns 3222 are connected with the valve core clamping ring groove 3231, the upper valve core 322 is limited on the lower valve core 323 and cannot fall off, and the four valve core clamping columns 3222 move in the limiting range of the valve core clamping ring groove 3231.

In the embodiment of the present application, the sealing gasket 321 is used to be movably connected with the pipe opening of the exhaust pipe 311 to perform an opening and closing function, so that the sealing gasket 321 is made of a rubber material (FKM) and has high sealing performance, as shown in fig. 6, a ventilation through hole 3213 is formed in the middle of the sealing gasket 321; the upper valve core 322 is made of a plastic material (POM), the lower valve core 323 is used for supporting the upper valve core 322, and the lower valve core 323 is made of a stainless steel material (SUS304), so that under the design, as shown in fig. 6, when the fuel pump is in a vertical state, the weight of the valve core 32 overcomes the spring force and the total internal pressure of the valve spring 33, the exhaust pipe 311 is in an open state, when the fuel pump inclines, the axial component force of the gravity of the valve core 32 in the valve spring 33 is reduced, the spring force can push the valve core 32 to move upwards, as shown in fig. 7 and 8, when the inclination angle is greater than or equal to 40 degrees, the sealing gasket 321 is abutted against the pipe orifice of the exhaust pipe 311, the lower valve core 323 is abutted against the ventilation through hole 3213 of the sealing gasket 321, the ventilation through hole 3213 is not ventilated, and the exhaust pipe 311 is in a closed state.

As described above, the roll-over valve of the present application is a 2-stage seal, the middle of the gasket 321 on the upper valve element 322 is provided with the ventilation through hole 3213, in a closed state, the gasket 321 closes the exhaust pipe 311, and the lower valve element 323 closes the ventilation through hole 3213 of the gasket 321. When the valve needs to be opened again, the lower valve core 323 overcomes the internal pressure and the elastic force of the spring to fall, the ventilation through hole 3213 of the sealing gasket 321 is communicated, the internal pressure disappears, at this time, the lower valve core 323 drives the upper valve core 322 to fall, and the large exhaust pipe 311 is completely opened.

Because the exhaust pipe 311 has a large diameter, if a single-stage valve core is used for sealing, the pressure of the internal pressure acting on the exhaust pipe 311 is large, and when the fuel pump is righted after the inclination angle is more than or equal to 40 degrees, the weight of the valve core 32 cannot overcome the internal pressure and the elastic force, so that the turnover valve cannot be reopened. After the small ventilation through hole 3213 is formed in the sealing gasket 321, the internal pressure generated therein is small, and after the weight is accurately set, the lower valve core 323 can fall down against the internal pressure and the elastic force of the spring during the reopening, so that the reopening operation is completed.

As shown in fig. 2, the fuel pump of the present application further includes a shock pad 50, the shock pad 50 is disposed on the bottom surface of the valve hole groove 13, the shock pad 50 corresponds to the valve element 32 and acts as a buffer for the valve element 32 when the valve element 32 moves downward, the shock pad 50 includes a middle through hole, and oil gas in the inner cavity can enter the valve hole groove 13 through the middle through hole of the shock pad 50 and be discharged from the exhaust pipe 311.

In fig. 2, the fuel pump of the present application further includes a float 60, a needle valve 70, a filter screen 80 and a pressure valve 90, the float 60, the needle valve 70, the filter screen 80 and the pressure valve 90 are disposed in the inner cavity, the needle valve 70 is disposed on the float 60, the float 60 is driven to move when floating up at the fuel, when the fuel reaches a set value, the needle valve 70 is closed to the nozzle of the fuel inlet pipe 12, the fuel does not enter the inner cavity, the fuel is pumped out, the float 60 descends to cause the needle valve 70 to open the nozzle of the fuel inlet pipe 12, and the fuel enters the inner cavity from the fuel inlet pipe 12; the middle part of the oil outlet pipe 11 is communicated with a pressure valve 90 through an oil return port, and the pressure valve 90 is used for keeping the pressure of oil in the oil outlet pipe 11 stable; the filter screen 80 is disposed at the oil inlet 43 of the pump body 40, and supplies the filtered fuel to the pump body 40 for pumping.

To sum up, the fuel pump of this application has the function of fuel feeding to the engine, still has oil-gas separation's effect, and the mode of realization sets up an blast pipe 311. After the fuel enters the inner cavity through the fuel inlet pipe 12, the oil and the gas are separated, the pump body 40 pumps the filtered fuel to the engine through the fuel outlet pipe 11, and the gas is discharged through the gas outlet pipe 311 arranged on the rollover valve 30. There is a problem in that when the fuel supply is excessive and the fuel pump is tilted or inverted, the fuel leaks from the exhaust pipe 311, causing environmental pollution and safety problems.

One solution to this problem is to provide a needle valve 70, float 60 and tumble valve 30 mechanism. When the fuel pump is inclined at an angle less than 40 degrees, and when a certain amount of fuel is fed into the fuel inlet pipe 12, the needle valve 70 mounted at the orifice of the fuel inlet pipe 12 is driven by the float 60 to be closed, so that fuel is not fed any more, and the fuel cannot leak from the exhaust pipe 311.

When the fuel pump inclination angle is larger than or equal to 40 degrees to 180 degrees, the float 60 cannot drive the needle valve 70 to close the nozzle of the fuel inlet pipe 12 for fuel inlet due to the buoyancy direction, and at the moment, the rollover valve 30 closes the nozzle of the exhaust pipe 311, so that fuel cannot leak from the exhaust pipe 311.

In summary, due to the adoption of the technical characteristics, compared with the prior art, the invention has the following advantages and positive effects:

firstly, the turnover valve is convenient to install, and can not leak oil when being tilted;

secondly, the fuel pump is guaranteed to pump oil continuously, and leakage of the fuel from the exhaust port due to excessive fuel is avoided.

The preferred embodiments of the invention are provided solely to aid in the illustration of the invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents. The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and it is intended that all equivalent variations and modifications of the present invention as those skilled in the art can be made without departing from the spirit and scope of the present invention.

Claims (4)

1. A small external fuel pump with side-tipping protection is characterized in that the fuel pump comprises an upper cover body, a lower shell, a tipping valve and a pump body, wherein the upper cover body and the lower shell are covered to form an inner cavity; the turnover valve comprises a valve cover, a valve core and a valve spring, wherein the valve cover is arranged on the valve hole groove and comprises an exhaust pipe; one end of the valve spring is connected with the groove bottom surface of the valve hole groove, the other end of the valve spring is connected with one end of the valve core, and the other end of the valve core is movably connected with the inner surface of the valve cover.

2. The small external fuel pump with roll protection as set forth in claim 1, wherein the valve core includes a seal gasket, an upper valve core and a lower valve core, a ventilation through hole is provided in the middle of the seal gasket, and the seal gasket is disposed on the upper valve core; the upper valve core is arranged on the lower valve core in a limiting mode, the upper valve core moves in a limiting range, and the sealing gasket is movably connected with the inner surface of the valve cover.

3. The small external fuel pump with roll protection of claim 2 further comprising a shock pad disposed on the bottom surface of said valve bore slot, said shock pad including a central through bore.

4. The external fuel pump with roll protection in accordance with claim 3, further comprising a float, needle, screen and pressure valve, said float, needle, screen and pressure valve disposed in said internal cavity.

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