阅读说明：本技术 一种电喷柴油机一体式燃油泵 (Integrated fuel pump of electronic injection diesel engine ) 是由 舒学军 于 2020-12-29 设计创作，主要内容包括：本发明涉及燃油泵技术领域,具体来说是一种电喷柴油机一体式燃油泵,包括：泵体、套接设置在泵体底部的增压泵柱塞,泵体顶部设有进油口和出油口；进油口和出油口之间设有油道；增压泵柱塞所在通道与油道连通；增压泵柱塞可在通道内往复运动,泵体为一体式设计,泵体包括顶盖和泵身,进油口和出油口开设在顶盖上部；本发明提供了一种柴油机燃油增压泵,通过一体化的结构设计,使其具有结构简单、性能好、油损耗低、排放少、可靠性强,使用寿命长等优点；本发明取代旧式的柱塞偶件结构,将增压泵柱塞取代头部螺旋槽式柱塞,同时一体化的设计,使得零件更换方便,还解决了现有技术中的渗漏问题,且能满足共轨、电喷柴油机的要求。(The invention relates to the technical field of fuel pumps, in particular to an integrated fuel pump of an electronic injection diesel engine, which comprises: the pump comprises a pump body and a booster pump plunger sleeved at the bottom of the pump body, wherein the top of the pump body is provided with an oil inlet and an oil outlet; an oil passage is arranged between the oil inlet and the oil outlet; the channel where the booster pump plunger is located is communicated with the oil duct; the booster pump plunger can reciprocate in the channel, the pump body is designed in an integrated manner, the pump body comprises a top cover and a pump body, and the oil inlet and the oil outlet are formed in the upper part of the top cover; the invention provides a diesel engine fuel booster pump, which has the advantages of simple structure, good performance, low oil loss, less discharge, strong reliability, long service life and the like through an integrated structural design; the invention replaces the old plunger matching part structure, replaces the spiral groove type plunger at the head part with the plunger of the booster pump, simultaneously adopts the integrated design, ensures that the parts are convenient to replace, also solves the leakage problem in the prior art, and can meet the requirements of common rail and electronic injection diesel engines.)

1. An electronic fuel injection diesel engine integral type fuel pump which characterized in that includes: the booster pump comprises a pump body (1) and a booster pump plunger (2) sleeved at the bottom of the pump body (1), wherein the top of the pump body (1) is provided with an oil inlet (4) and an oil outlet (5);

an oil duct (12) is arranged between the oil inlet (4) and the oil outlet (5);

the channel (13) where the booster pump plunger (2) is located is communicated with the oil duct (12);

the booster pump plunger (2) is reciprocable in the channel.

2. An electronic fuel injection diesel engine integrated fuel pump as claimed in claim 1, characterized in that: the pump body (1) is designed in an integrated mode.

3. An electronic fuel injection diesel engine integrated fuel pump as claimed in claim 1, characterized in that: the pump body (1) comprises a top cover (8) and a pump body (9), and the oil inlet (4) and the oil outlet (5) are formed in the upper portion of the top cover (8).

4. An electronic fuel injection diesel engine integrated fuel pump as claimed in claim 3, characterized in that: and oil discharge ports (3) communicated with the oil duct (12) are respectively formed in two sides of the top cover (8), and the oil discharge ports (3) are sealed through detachable oil discharge sealing screw plugs (11).

5. An electronic fuel injection diesel engine integrated fuel pump as claimed in claim 3, characterized in that: the clearance between the internal channel (13) of the pump body (9) and the booster pump plunger (2) is 0.014-0.018 mm.

6. An electronic fuel injection diesel engine integrated fuel pump as claimed in claim 3, characterized in that: and a positioning pin (6) is arranged at the bottom of the top cover (8), and the positioning pin (6) is used for installing and positioning the pump body (1).

7. An electronic fuel injection diesel engine integrated fuel pump as claimed in claim 3, characterized in that: the pump body (9) is provided with at least one sealing ring (7).

8. An electronic fuel injection diesel engine integrated fuel pump as claimed in claim 3, characterized in that: the upper part of the top cover (8) is also provided with a pressure relief hole (14), and the pressure relief hole (14) is sealed by a pressure relief sealing plug screw (15).

Technical Field

The invention relates to the technical field of fuel pumps, in particular to a fuel pump body of an electronic injection diesel engine.

Background

In the prior art, a high-pressure common rail system and an electronic injection technology of a diesel engine are a new direction for the development of marine diesel engines in the world, and the system adopts a highly automatic intelligent control unit, so that the electronic injection main machine has a highly flexible control function, can realize very high injection pressure, achieves excellent fuel oil atomization effect and realizes adjustable pressure in an ideal oil injection process; meanwhile, the method can realize the control of various injection rules meeting the minimum emission requirements under various working conditions and flexible and accurate oil injection timing control, so that the freedom degree of the control of the diesel engine is increased, the development potential required by meeting stricter emission regulation requirements of the future diesel engine is provided, and a wider space is provided for further improving the performance of the diesel engine.

The high-pressure fuel pump inner top cover assembly is designed based on a high-pressure fuel pump of an electronic injection diesel engine. The plunger of the oil pump is not driven by a camshaft any more, but instead is the plunger of the fuel oil hydraulic pump in the top cover assembly, and the plunger of the fuel oil hydraulic pump is driven by the main lubricating oil which has higher cleanliness and is pressurized, and the main lubricating oil pushes the hydraulic piston in the high-pressure oil pump to drive the plunger of the fuel oil hydraulic pump to move up and down; the vibration of the common rail and the electronic injection diesel engine is reduced to a new low point, and various indexes of the diesel engine have new standards. It is believed that with the change of the science and technology in the world, the marine main engine with continuous technical innovation in the future can provide more green, environment-friendly and efficient power guarantee for the development and progress of the world, and the existing electronic injection diesel engine has the problems of complex structure and high sealing difficulty.

Disclosure of Invention

First, technical problem to be solved

The invention provides an integrated fuel pump of an electronic injection diesel engine aiming at the defects in the prior art, and solves the problems of complex structure and high sealing difficulty of the conventional fuel pump of the electronic injection diesel engine.

Second, technical scheme

In order to solve the technical problem, the invention provides an integrated fuel pump of an electronic injection diesel engine. The method comprises the following steps: the pump comprises a pump body and a booster pump plunger sleeved at the bottom of the pump body, wherein the top of the pump body is provided with an oil inlet and an oil outlet;

an oil passage is arranged between the oil inlet and the oil outlet;

the channel where the booster pump plunger is located is communicated with the oil duct;

a booster pump plunger is reciprocable within the passage.

Wherein, the pump body is the integral type design.

The pump body comprises a top cover and a pump body, and the oil inlet and the oil outlet are formed in the upper portion of the top cover.

Wherein, the oil drain port that communicates with the oil duct is seted up respectively to the top cap both sides, and the oil drain port is sealed through the sealed plug screw of the oil extraction that can dismantle.

Wherein, the clearance between the internal passage of the pump body and the plunger of the booster pump is 0.014-0.018 mm.

Wherein, the top cap bottom is equipped with the locating pin, and the locating pin is used for the installation location of the pump body.

Wherein, the pump body is provided with at least one sealing ring.

Wherein, the top cap upper portion still is equipped with the pressure release hole, and the pressure release hole is sealed through pressure release sealing plug screw.

Third, beneficial effect

Compared with the prior art, the invention provides the diesel engine fuel booster pump, which has the advantages of simple structure, good performance, low oil loss, less emission, strong reliability, long service life and the like through an integrated structural design;

the invention replaces the old plunger matching part structure, replaces the spiral groove type plunger at the head part with the booster pump plunger, simultaneously adopts the integrated design, ensures that the parts are convenient to replace, also solves the leakage problem in the prior art, and can meet the requirements of common rail and electronic injection diesel engines.

Drawings

FIG. 1 is a cross-sectional view of the fuel pump of the present invention in a major configuration;

FIG. 2 is a top view of the fuel pump body construction of the present invention;

FIG. 3 is a cross-sectional view A-A of the fuel pump of the present invention;

FIG. 4 is a cross-sectional view B-B of the fuel pump of the present invention;

in the figure: the pump body is 1, 2 is the booster pump plunger, 3 is the oil drain port, 4 is the oil inlet, 5 is the oil-out, 6 is the locating pin, 7 is the sealing ring, 8 is the top cap, 9 is the pump body, 10 is the cap, 11 is the sealed plug screw of oil extraction, 12 is the oil duct, 13 is the passageway, 14 is the pressure release hole, 15 is the sealed plug screw of pressure release.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with 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 electronic fuel injection diesel engine integral type fuel pump of this embodiment includes: the pump comprises a pump body 1 and a booster pump plunger 2 sleeved at the bottom of the pump body 1, wherein the top of the pump body 1 is provided with an oil inlet 4 and an oil outlet 5;

an oil duct 12 is arranged between the oil inlet 4 and the oil outlet 5, oil discharge ports 3 communicated with the oil duct 12 are respectively formed in two sides of the top cover 8, the oil discharge ports 3 are sealed through detachable oil discharge sealing screw plugs 11, and redundant oil in the fuel pump can be discharged through the oil discharge ports 3; a channel 13 where the booster pump plunger 2 is located is communicated with the oil duct 12, and the effect of boosting the oil in the fuel pump is achieved through the up-and-down movement of the booster pump plunger 2;

the booster pump plunger 2 is reciprocally movable in the passage, a cap 10 is provided at the bottom of the booster pump plunger 2, the booster pump plunger 2 is screwed with the cap 10 at a screwing force of 270Nm by connecting the cap 10 to the crankshaft, and the surface roughness of the booster pump plunger 2 is lower than ra0.1 and the cylindricity is lower than 0.004 mm.

The pump body 1 formula design as an organic whole, whole pump body 1 includes top cap 8 and pump body 9, and oil inlet 4 and oil-out 5 are seted up on top cap 8 upper portion, through the structural design of integration, make it have simple structure, good performance, oil loss is low, the emission is few, the good reliability, advantages such as long service life.

The clearance between the inner channel 13 of the pump body 9 and the booster pump plunger 2 is 0.014-0.018mm, so that the situation of oil leakage between the booster pump plunger 2 and the pump body 9 is ensured; as shown in fig. 1, at least one sealing ring 7 is provided on the pump body 9, and in this embodiment, two sealing rings 7 are provided on the pump body 9, so as to ensure the sealing performance after the fuel pump is installed.

The invention replaces the old plunger matching part structure, replaces the spiral groove type plunger at the head part with the plunger of the booster pump, simultaneously adopts the integrated design, ensures that the parts are convenient to replace, also solves the leakage problem caused by the matching of a plurality of parts in the prior art, reduces the number of parts, turns the parts into simple and complex, has better product performance, is smoother when high-pressure fuel passes through, has no blocked condition, is easier to continuously provide high-pressure fuel for an injection device, ensures that the injection at each time is more stable, and can meet the requirements of common rail and electric injection diesel engines

Example 2:

compared with embodiment 1, as shown in fig. 1, in this embodiment, a pressure relief hole 14 is further formed in the upper portion of the top cover 8, and the pressure relief hole 14 is sealed by a pressure relief sealing plug 15, so that the safety of use is ensured.

Meanwhile, the bottom of the top cover 8 is provided with a positioning pin 6, and the positioning pin 6 is used for installing and positioning the pump body 1.

The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention.