Full-oil pick-up internal gear type oil transfer pump

Abstract

The application provides a full-oil-return internal gear type oil delivery pump, which comprises a pump body, an oil inlet hole and an oil outlet hole arranged on the pump body; the pump body is internally provided with a mounting cavity, and a safety valve core is arranged in the mounting cavity; the upper side of the oil outlet hole is provided with a mounting hole, the inner wall of the lower side of the oil outlet hole is provided with an adaptive groove opposite to the position of the mounting hole, a sealing steel ball is placed in the adaptive groove, a bypass valve seat is arranged in the mounting hole, and a gap exists between the lower end of the bypass valve seat and the sealing steel ball; a compression spring is arranged between the sealing steel ball and the bypass valve seat, and the sealing steel ball is tightly pressed by the compression spring. The application has the beneficial technical effects that the full-oil-return internal gear type oil delivery pump can effectively reduce the stroke of fuel and reduce energy consumption.

Description

Technical Field

[0001] The present invention relates to an oil pump for supplying fuel, in particular to an internal gear type oil pump with full oil return. Background Art

[0002] Gear-type fuel pumps are usually used to transfer low-pressure fuel from the fuel tank to the injection pump or other equipment. During the stable pumping process, if the pressure at the oil outlet is too high, a pressure-limiting valve is usually used to relieve the pressure, allowing the high-pressure oil to return directly to the fuel tank. This oil return method greatly increases the fuel stroke, reduces the fuel supply efficiency of the fuel pump, and increases energy loss. Summary of the Invention

[0003] In response to the problems in the background technology, the present invention proposes a full-return oil-return internal meshing gear oil pump, comprising a pump body, an oil inlet hole and an oil outlet hole arranged on the pump body, the outer end of the oil inlet hole is connected to an external oil supply pump through a pipeline, the inner end of the oil inlet hole is connected to an oil suction chamber in the pump body, the outer end of the oil outlet hole is connected to an external fuel injection pump through a pipeline, and the inner end of the oil outlet hole is connected to an oil pressure chamber in the pump body; the improvement is that: an installation chamber is provided in the pump body, the lower end of the installation chamber is connected to the lower end face of the pump body; the upper end of the installation chamber is connected to the oil pressure chamber through a channel; the middle part of the installation chamber is connected to the oil inlet The holes partially overlap; a sealing cone surface is provided in the middle of the installation cavity, and the sealing cone surface is located on the upper side of the overlapping portion of the installation cavity and the oil inlet hole; a spring seat is provided at the lower end of the installation cavity, and the spring seat closes the lower end of the installation cavity; a safety valve core is provided in the installation cavity, and a sealing surface matching the sealing cone surface is provided in the middle of the safety valve core; a pre-tightening spring is provided between the safety valve core and the spring seat, and the pre-tightening spring presses the safety valve core against the sealing cone surface; when the sealing surface and the sealing cone surface are in contact, the oil pressure chamber and the oil inlet hole are isolated from each other; when the sealing surface and the sealing cone surface are separated, the oil pressure chamber and the oil inlet hole are connected to each other;

[0004] A mounting hole is provided on the upper side of the oil outlet hole, which connects the oil outlet hole and the upper end surface of the pump body; an adapter groove is provided on the inner wall of the lower side of the oil outlet hole, and the adapter groove is opposite to the mounting hole; the bottom of the adapter groove is connected to the oil inlet hole through a connecting hole; a sealing steel ball is placed in the adapter groove, and the size of the sealing steel ball matches the upper port of the connecting hole; a bypass valve seat is provided in the mounting hole, which closes the mounting hole, and the lower end of the bypass valve seat extends to a position close to the adapter groove, and there is a gap between the lower end of the bypass valve seat and the sealing steel ball; a compression spring is provided between the sealing steel ball and the bypass valve seat, and the compression spring presses the sealing steel ball against the upper port of the connecting hole; when the sealing steel ball contacts the upper port of the connecting hole, the oil inlet hole and the oil outlet hole are isolated from each other, and when the sealing steel ball and the upper port of the connecting hole are separated, the oil inlet hole and the oil outlet hole are connected to each other.

[0005] The principle of the above scheme is: in the initial stage of starting, when the driving gear and the internal gear are engaged and disengaged, a local vacuum is formed in the oil suction chamber, and the fuel is sucked into the oil suction chamber. At this time, since the fuel has not yet entered the oil outlet hole, the fuel in the oil inlet hole will push up the sealing steel ball, and a part of the fuel will flow into the oil pressure chamber to lubricate the driving gear and the internal gear. At the same time, the fuel flowing into the oil pressure chamber can also squeeze the internal gas out of the oil pressure chamber, so that the gas enters the external fuel injection pump through the oil outlet hole and is finally discharged outward through the exhaust valve on the fuel injection pump; during stable operation, if the oil pressure in the oil pressure chamber is too high, the fuel will push the safety valve core downward, causing the sealing cone surface to open, and the fuel will flow back to the oil inlet hole through the installation chamber; after adopting this scheme, the fuel discharged during pressure relief will no longer flow back to the fuel tank, which can effectively reduce the fuel stroke and reduce energy consumption.

[0006] Preferably, the gears of the internal gear oil pump are enclosed within the pump body via a bottom cover. The bottom cover is provided with a zero-supply oil return hole, the inner end of which communicates with the oil suction chamber, and the outer end of which is connected to the oil return port of the fuel injection pump via a return oil line. A one-way valve is provided on the return oil line, restricting the flow of fuel within the fuel injection pump to a single direction, through the return oil line, toward the zero-supply oil return hole. When the fuel injection pump stops operating, the high-pressure fuel within the fuel injection pump returns to the oil suction chamber via the return oil line and the zero-supply oil return hole.

[0007] The beneficial technical effect of the present invention is that a full-oil-return internal gear oil pump is proposed, which can effectively reduce the fuel stroke and reduce energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 , a schematic diagram of the axial cross-section structure of the present invention;

[0009] Figure 2 , schematic diagram of the cross-sectional structure at the installation cavity position;

[0010] Figure 3 , schematic diagram of the cross-sectional structure at the gear position;

[0011] Figure 4 , a partial cross-sectional view of the bottom cover at the position of the zero oil supply and oil return hole;

[0012] The names corresponding to the various marks in the figure are: oil inlet hole 1, oil outlet hole 2, adapter groove 21, oil suction chamber 3, oil pressure chamber 4, installation chamber 5, spring seat 51, safety valve core 52, communicating hole 6, bypass valve seat 7, sealing steel ball 8, compression spring 9, zero oil supply return hole 10, driving gear 11, and internal gear 12. DETAILED DESCRIPTION

[0013] A full-return internal meshing gear oil pump, comprising a pump body, an oil inlet hole 1 and an oil outlet hole 2 provided on the pump body, the outer end of the oil inlet hole (1) being connected to an external oil supply pump via a pipeline, the inner end of the oil inlet hole 1 being connected to an oil suction chamber 3 in the pump body, the outer end of the oil outlet hole 2 being connected to an external fuel injection pump via a pipeline, the inner end of the oil outlet hole 2 being connected to an oil pressure chamber 4 in the pump body; the improvement thereof is that: an installation chamber 5 is provided in the pump body, the lower end of the installation chamber 5 being connected to the lower end surface of the pump body; the upper end of the installation chamber 5 being connected to the oil pressure chamber 4 via a channel; the middle portion of the installation chamber 5 partially overlaps with the oil inlet hole 1; the middle portion of the installation chamber 5 A sealing cone surface is provided, and the sealing cone surface is located on the upper side of the overlapping portion of the installation chamber 5 and the oil inlet hole 1; a spring seat 51 is provided at the lower end of the installation chamber 5, and the spring seat 51 closes the lower end of the installation chamber 5; a safety valve core 52 is provided in the installation chamber 5, and a sealing surface matching the sealing cone surface is provided in the middle of the safety valve core 52, and a pre-tightening spring is provided between the safety valve core 52 and the spring seat 51, and the pre-tightening spring presses the safety valve core 52 against the sealing cone surface; when the sealing surface and the sealing cone surface are in contact, the oil pressure chamber 4 and the oil inlet hole 1 are isolated from each other; when the sealing surface and the sealing cone surface are separated, the oil pressure chamber 4 and the oil inlet hole 1 are connected to each other;

[0014] The oil outlet hole 2 is provided with a mounting hole on the upper side, and the mounting hole connects the oil outlet hole 2 with the upper end surface of the pump body; an adapting groove 21 is provided on the inner wall of the lower side of the oil outlet hole 2, and the adapting groove 21 is opposite to the mounting hole; the bottom of the adapting groove 21 is connected to the oil inlet hole 1 through a connecting hole 6; a sealing steel ball 8 is placed in the adapting groove 21, and the size of the sealing steel ball 8 matches the upper end of the connecting hole 6; a bypass valve seat 7 is provided in the mounting hole, and the bypass valve seat 7 closes the mounting hole, bypassing The lower end of the valve seat 7 extends to a position close to the adapter groove 21, and there is a gap between the lower end of the bypass valve seat 7 and the sealing steel ball 8; a compression spring 9 is provided between the sealing steel ball 8 and the bypass valve seat 7, and the compression spring 9 presses the sealing steel ball 8 against the upper end of the communicating hole 6; when the sealing steel ball 8 contacts the upper end of the communicating hole 6, the oil inlet hole 1 and the oil outlet hole 2 are isolated from each other, and when the sealing steel ball 8 and the upper end of the communicating hole 6 are separated, the oil inlet hole 1 and the oil outlet hole 2 are connected to each other.

[0015] Furthermore, the gears of the internal meshing gear oil pump are encapsulated in the pump body through the bottom cover; a zero oil supply return hole 10 is provided on the bottom cover, the inner end of the zero oil supply return hole 10 is connected to the oil suction chamber 3, and the outer end of the zero oil supply return hole 10 is connected to the return oil port of the injection pump through the return oil pipeline, and a one-way valve is provided on the return oil pipeline, which allows the fuel in the injection pump to flow only in one direction to the zero oil supply return hole 10 through the return oil pipeline.

Claims

1. A full-return internal gear oil pump, comprising a pump body, an oil inlet hole (1) and an oil outlet hole (2) provided on the pump body, wherein the outer end of the oil inlet hole (1) is connected to an external oil supply pump via a pipeline, the inner end of the oil inlet hole (1) is communicated with an oil suction chamber (3) in the pump body, the outer end of the oil outlet hole (2) is connected to an external fuel injection pump via a pipeline, and the inner end of the oil outlet hole (2) is communicated with an oil pressure chamber (4) in the pump body; characterized in that: The pump body is provided with an installation cavity (5), the lower end of the installation cavity (5) is communicated with the lower end surface of the pump body; the upper end of the installation cavity (5) is communicated with the oil pressure cavity (4) through a channel; the middle of the installation cavity (5) partially overlaps with the oil inlet hole (1); the middle of the installation cavity (5) is provided with a sealing cone surface, which is located on the upper side of the overlapping portion of the installation cavity (5) and the oil inlet hole (1); a spring seat (51) is provided at the lower end of the installation cavity (5), and the spring seat (51) seals the installation cavity (5) The lower end of the valve core (5) is closed; a safety valve core (52) is provided in the installation cavity (5); a sealing surface matching the sealing cone surface is provided in the middle of the safety valve core (52); a preload spring is provided between the safety valve core (52) and the spring seat (51); the preload spring presses the safety valve core (52) against the sealing cone surface; when the sealing surface and the sealing cone surface are in contact, the oil pressure cavity (4) and the oil inlet hole (1) are isolated from each other; when the sealing surface and the sealing cone surface are separated, the oil pressure cavity (4) and the oil inlet hole (1) are communicated with each other; The oil outlet hole (2) is provided with a mounting hole on the upper side thereof, and the mounting hole connects the oil outlet hole (2) and the upper end surface of the pump body; an adapting groove (21) is provided on the inner wall of the lower side of the oil outlet hole (2), and the adapting groove (21) is opposite to the mounting hole; the bottom of the adapting groove (21) is connected to the oil inlet hole (1) through a connecting hole (6); a sealing steel ball (8) is placed in the adapting groove (21), and the size of the sealing steel ball (8) matches the upper end of the connecting hole (6); a bypass valve seat (7) is provided in the mounting hole, and the bypass valve seat (7) closes the mounting hole, and the bypass valve seat (7) ) extends to a position close to the adapting groove (21), and a gap is formed between the lower end of the bypass valve seat (7) and the sealing steel ball (8); a compression spring (9) is provided between the sealing steel ball (8) and the bypass valve seat (7), and the compression spring (9) presses the sealing steel ball (8) against the upper end of the communicating hole (6); when the sealing steel ball (8) and the upper end of the communicating hole (6) are in contact, the oil inlet hole (1) and the oil outlet hole (2) are isolated from each other, and when the sealing steel ball (8) and the upper end of the communicating hole (6) are separated, the oil inlet hole (1) and the oil outlet hole (2) are connected to each other.

2. The full oil return internal gear oil pump according to claim 1, characterized in that: The gears of the internal meshing gear type oil pump are encapsulated in the pump body through the bottom cover; a zero oil supply return hole (10) is provided on the bottom cover, the inner end of the zero oil supply return hole (10) is communicated with the oil suction chamber (3), and the outer end of the zero oil supply return hole (10) is connected to the oil return port of the injection pump through an oil return pipeline, and a one-way valve is provided on the oil return pipeline, which allows the fuel in the injection pump to flow in one direction only toward the zero oil supply return hole (10) through the oil return pipeline.

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