阅读说明：本技术 一种装有出油阀的分配泵柱塞及其工作方法 (Distribution pump plunger with oil outlet valve and working method thereof ) 是由 吴国伟 张振廷 于 2019-09-25 设计创作，主要内容包括：本发明公开了一种装有出油阀的分配泵柱塞及其工作方法,分配泵柱塞通过凸轮盘带动在分配套筒内作往复、旋转运动,其中,往复运动使燃油在高压油腔内增压,旋转运动进行燃油分配；所述柱塞上还设有：出油阀安装孔,沿柱塞轴线方向设置在柱塞伸入高压油腔的一端,用于安装出油阀,包括与柱塞同轴设置的第一轴孔、第二轴孔以及连接在第一轴孔和第二轴孔之间的环槽；出油阀安装孔的尾部通过一倾斜油道与柱塞分配槽连接；柱塞上设有柱塞泄压槽和进油槽,其中,所述柱塞泄压槽通过泄油通道与进油槽相连；油量控制套筒,套接在柱塞上远离高压油腔的一端,用于当柱塞往复运动时,打开或关闭所述的柱塞泄压槽,实现供油量的控制。(The invention discloses a distribution pump plunger with an oil outlet valve and a working method thereof, wherein the distribution pump plunger is driven by a cam disc to do reciprocating and rotating motion in a distribution sleeve, wherein the reciprocating motion enables fuel oil to be pressurized in a high-pressure oil cavity, and the rotating motion carries out fuel oil distribution; the plunger is also provided with: the oil outlet valve mounting hole is arranged at one end, extending into the high-pressure oil cavity, of the plunger along the axis direction of the plunger, is used for mounting the oil outlet valve, and comprises a first shaft hole and a second shaft hole which are coaxially arranged with the plunger, and a ring groove connected between the first shaft hole and the second shaft hole; the tail part of the oil outlet valve mounting hole is connected with the plunger distribution groove through an inclined oil duct; the plunger is provided with a plunger pressure relief groove and an oil inlet groove, wherein the plunger pressure relief groove is connected with the oil inlet groove through an oil drainage channel; and the oil quantity control sleeve is sleeved at one end of the plunger, which is far away from the high-pressure oil cavity, and is used for opening or closing the plunger pressure relief groove when the plunger reciprocates to realize the control of the oil supply quantity.)

1. A distribution pump plunger with an oil outlet valve is driven by a cam disc to reciprocate and rotate in a distribution sleeve, wherein the reciprocating motion enables fuel oil to be pressurized in a high-pressure oil cavity, and the rotating motion distributes the fuel oil;

the high-pressure oil cavity is enclosed by a plunger, a distribution sleeve and a pump head plug screw, and the high-pressure oil cavity is characterized in that the plunger is further provided with:

the oil outlet valve mounting hole is arranged at one end, extending into the high-pressure oil cavity, of the plunger along the axis direction of the plunger, is used for mounting the oil outlet valve, and comprises a first shaft hole and a second shaft hole which are coaxially arranged with the plunger, and a ring groove connected between the first shaft hole and the second shaft hole;

the oil outlet valve comprises a spring, a damping valve core and an oil outlet valve seat, wherein the left end of the damping valve core is provided with a spring mounting hole, the spring is arranged in the spring mounting hole of the damping valve core, the right end of the damping valve core is provided with a small damping hole, and the bottom of the spring mounting hole is radially provided with 4 oil inlet holes; the damping valve core is arranged in a first shaft hole of the plunger, the damping valve core can move left and right, the first shaft hole plays a role in guiding, and the bottom of the first shaft hole plays a role in limiting;

an oil outlet valve seat is installed in the second shaft hole, two pin holes which are symmetrically arranged are axially formed in the second shaft hole, and the oil outlet valve seat is fixed in the second shaft hole of the plunger through two pins;

one end of a spring arranged in a hole on the left side of the damping valve core is contacted with the bottom of the first shaft hole, the other end of the spring is contacted with the bottom of a spring hole of the damping valve core, and the damping valve core is pressed towards the right side by the spring force to the end face of the oil outlet valve seat;

the tail part of the oil outlet valve mounting hole is connected with the plunger distribution groove through an inclined oil duct;

the plunger is provided with a plunger pressure relief groove and an oil inlet groove, wherein the plunger pressure relief groove is connected with the oil inlet groove through an oil drainage channel;

and the oil quantity control sleeve is sleeved at one end of the plunger, which is far away from the high-pressure oil cavity, and is used for opening or closing the plunger pressure relief groove when the plunger reciprocates to realize the control of the oil supply quantity.

2. The plunger of a dispensing pump equipped with a fuel outlet valve as recited in claim 1, wherein said fuel drainage passage comprises two fuel drainage passage units, respectively a first fuel drainage passage unit disposed radially along said plunger and a second fuel drainage passage unit connected between said first fuel drainage passage unit and the bottom of said plunger fuel inlet groove.

3. The dispensing pump plunger with delivery valve of claim 1 wherein a conical seal is provided between the dispensing housing and the delivery valve seat.

4. A method of operating a plunger of a dispensing pump equipped with a delivery valve as claimed in claim 1 ~ 3,

oil filling process:

the plunger is driven by the rotation of the cam disc to rotate to a certain oil inlet groove on the plunger and is communicated with the oil inlet hole of the distribution sleeve, meanwhile, the cam disc drives the plunger to move leftwards, the volume of a high-pressure oil cavity is increased, and fuel enters a high-pressure oil cavity after sequentially passing through the oil inlet hole in the distribution shell, the oil inlet solenoid valve mounting hole, the oil inlet valve seat hole, the oil inlet hole in the distribution sleeve and the oil inlet groove on the plunger, so that the oil filling process of the plunger is completed;

oil supply process:

the plunger rotates a certain angle until the oil inlet groove is not communicated with the oil inlet hole of the distribution sleeve;

the oil quantity control sleeve closes a plunger pressure relief groove on the plunger, an oil supply groove in the plunger is communicated with a certain distribution oil channel in the distribution sleeve, meanwhile, the cam disc drives the plunger to move rightwards, the volume of a high-pressure oil cavity is reduced, the pressure of fuel oil in the high-pressure oil cavity is increased, high-pressure fuel oil enters from an oil channel in an oil outlet valve seat at the end part of the plunger and pushes a damping valve core to move leftwards to overcome the elasticity of a spring, an oil outlet valve is opened, the fuel oil flows into the annular groove from a valve port between the oil outlet valve seat and the damping valve core, the fuel oil continuously passes through 4 radial small holes in the damping valve core, the high-pressure fuel oil enters a spring mounting cavity of the damping valve core through the oil channel, the annular groove and 4 oil inlet holes in the oil outlet valve seat and then enters the plunger distribution groove through an inclined oil channel;

the oil cut-off process:

when the plunger continues to move rightwards, the plunger pressure relief groove in the plunger is exposed out of the sealing surface of the oil quantity control sleeve, the high-pressure oil cavity is communicated with an external low-pressure cavity through the oil inlet groove, the oil drainage channel and the plunger pressure relief groove at the moment, fuel oil rapidly flows out of the plunger pressure relief groove, the pressure of the high-pressure oil cavity is rapidly reduced, the damping valve core rapidly moves rightwards under the action of spring force to reach the valve seat surface of the oil outlet valve seat at the moment, the oil outlet valve is closed, the fuel oil with residual pressure in the high-pressure oil pipe slowly flows into the high-pressure oil cavity through the damping hole in the damping valve core at the moment, the rapid reduction of the pressure in the high-pressure oil pipe is ensured, when the oil injector is rapidly closed, certain pressure can be kept.

Technical Field

The invention discloses a VE dispensing pump element, in particular to a dispensing pump plunger with an oil outlet valve.

Background

In the VE pump fuel oil system, an oil outlet valve is arranged between an oil pump and a high-pressure oil pipe. The oil outlet valve is similar to a one-way valve in function, when the oil pump supplies oil, the oil outlet valve is opened in the positive direction, the oil pump supplies oil to the high-pressure oil pipe, and the pressure at the end of the oil sprayer rises rapidly and oil injection begins. When the oil supply is finished, the valve core of the oil outlet valve is seated, and meanwhile, the high-pressure oil pipe is ensured to participate in rapid pressure reduction, so that the rapid closing of the oil injector is realized, and the oil injection is stopped.

The working process of the oil outlet valve is as follows: when the oil pump starts to supply oil, the pressure of an oil inlet at the bottom of the oil outlet valve rises, the damping valve is pushed to overcome the spring force of the damping valve spring to move upwards, the damping valve is separated from the contact surface of the valve seat and is ended at the limiting surface of the limiter, and at the moment, fuel oil can flow into the limiter from an oil way on the limiter and flows out of the oil outlet valve to supply oil to the high-pressure oil pipe. When oil supply is finished, the damping valve moves downwards under the action of the spring force of the damping spring and is attached to the oil outlet valve seat, the oil outlet valve is closed, and residual pressure oil in the high-pressure oil pipe flows out of the damping hole in the damping valve, so that the oil sprayer stops oil injection quickly, and certain pressure is ensured to exist in the high-pressure oil pipe.

Because each cylinder is provided with an oil outlet valve, the difference of the oil outlet valves of the cylinders can cause the difference of the oil supply quantity of each cylinder, and the oil supply uniformity of the oil pump is poor. And the quantity of the oil outlet valves is large, and the manufacturing cost is high. Taking a four-cylinder injection pump as an example, 4 oil outlet valves are installed on one oil pump.

Disclosure of Invention

In view of the above technical problems, the present invention provides a dispensing pump plunger with a new structure, which can improve the uniformity of each cylinder of a VE-type dispensing pump and reduce the manufacturing cost.

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

a distribution pump plunger with an oil outlet valve is driven by a cam disc to reciprocate and rotate in a distribution sleeve, wherein the reciprocating motion enables fuel oil to be pressurized in a high-pressure oil cavity, and the rotating motion distributes the fuel oil;

the high-pressure oil cavity is enclosed by a plunger, a distribution sleeve and a pump head plug screw, and the plunger is further provided with:

the oil outlet valve mounting hole is arranged at one end, extending into the high-pressure oil cavity, of the plunger along the axis direction of the plunger, is used for mounting the oil outlet valve, and comprises a first shaft hole and a second shaft hole which are coaxially arranged with the plunger, and a ring groove connected between the first shaft hole and the second shaft hole;

the oil outlet valve comprises a spring, a damping valve core and an oil outlet valve seat, wherein a spring mounting hole is formed in the left end of the damping valve core, the spring is mounted in the spring mounting hole of the damping valve core, a small damping hole is formed in the right end of the damping valve core, and 4 oil inlet holes 3.2.2 are radially designed in the bottom of the spring mounting hole. The damping valve core is arranged in a first shaft hole of the plunger, the damping valve core can move left and right, the first shaft hole plays a role in guiding, and the bottom of the first shaft hole plays a role in limiting;

an oil outlet valve seat is installed in the second shaft hole, two pin holes which are symmetrically arranged are axially formed in the second shaft hole, and the oil outlet valve seat is fixed in the second shaft hole of the plunger through two pins;

one end of a spring arranged in a hole on the left side of the damping valve core is contacted with the bottom of the first shaft hole, the other end of the spring is contacted with the bottom of a spring hole of the damping valve core, and the damping valve core is pressed towards the right side by the spring force to the end face of the oil outlet valve seat;

the tail part of the oil outlet valve mounting hole is connected with the plunger distribution groove through an inclined oil duct;

the plunger is provided with a plunger pressure relief groove and an oil inlet groove, wherein the plunger pressure relief groove is connected with the oil inlet groove through an oil drainage channel;

and the oil quantity control sleeve is sleeved at one end of the plunger, which is far away from the high-pressure oil cavity, and is used for opening or closing the plunger pressure relief groove when the plunger reciprocates to realize the control of the oil supply quantity.

The oil drainage channel comprises two oil drainage channel units, and is respectively an edge of a first oil drainage channel unit radially arranged by the plunger and a second oil drainage channel unit connected between the first oil drainage channel unit and the bottom of the oil inlet groove of the plunger.

The conical surface sealing is adopted between the distribution shell and the oil outlet valve tight seat.

The invention further discloses a working method of the distribution pump plunger with the oil outlet valve,

oil filling process:

the plunger is driven by the rotation of the cam disc to rotate to a certain oil inlet groove on the plunger and is communicated with the oil inlet hole of the distribution sleeve, meanwhile, the cam disc drives the plunger to move leftwards, the volume of a high-pressure oil cavity is increased, and fuel enters a high-pressure oil cavity after sequentially passing through the oil inlet hole in the distribution shell, the oil inlet solenoid valve mounting hole, the oil inlet valve seat hole, the oil inlet hole in the distribution sleeve and the oil inlet groove on the plunger, so that the oil filling process of the plunger is completed;

oil supply process:

the plunger rotates a certain angle until the oil inlet groove is not communicated with the oil inlet hole of the distribution sleeve;

the oil quantity control sleeve closes a plunger pressure relief groove on the plunger, an oil supply groove in the plunger is communicated with a certain distribution oil channel in the distribution sleeve, meanwhile, the cam disc drives the plunger to move rightwards, the volume of a high-pressure oil cavity is reduced, the pressure of fuel oil in the high-pressure oil cavity is increased, high-pressure fuel oil enters from an oil channel in an oil outlet valve seat at the end part of the plunger and pushes a damping valve core to move leftwards to overcome the elasticity of a spring, an oil outlet valve is opened, the fuel oil flows into the annular groove from a valve port between the oil outlet valve seat and the damping valve core, the fuel oil continuously passes through 4 radial small holes in the damping valve core, the high-pressure fuel oil enters a spring mounting cavity of the damping valve core through the oil channel, the annular groove and 4 oil inlet holes in the oil outlet valve seat and then enters the plunger distribution groove through an inclined oil channel;

the oil cut-off process:

when the plunger continues to move rightwards, the plunger pressure relief groove in the plunger is exposed out of the sealing surface of the oil quantity control sleeve, the high-pressure oil cavity is communicated with an external low-pressure cavity through the oil inlet groove, the oil drainage channel and the plunger pressure relief groove at the moment, fuel oil rapidly flows out of the plunger pressure relief groove, the pressure of the high-pressure oil cavity is rapidly reduced, the damping valve core rapidly moves rightwards under the action of spring force to reach the valve seat surface of the oil outlet valve seat at the moment, the oil outlet valve is closed, the fuel oil with residual pressure in the high-pressure oil pipe slowly flows into the high-pressure oil cavity through the damping hole in the damping valve core at the moment, the rapid reduction of the pressure in the high-pressure oil pipe is ensured, when the oil injector is rapidly closed, certain pressure can be kept.

Has the advantages that:

compared with the existing plunger piston structure, the plunger piston of the distribution pump with the oil outlet valve has the following advantages that:

the invention simplifies the structure of the damping oil outlet valve, cancels the position limiter of the oil outlet valve, and installs the oil outlet valve in the plunger, thus realizing the function that one oil outlet valve controls the oil supply of each cylinder of the oil pump.

The oil pump sprays oil with the same plunger and the same oil outlet valve each time, so that the difference of each cylinder is reduced, and the oil spraying uniformity of the oil pump is improved; meanwhile, the using quantity of the oil outlet valves is reduced, and the manufacturing cost is reduced.

3. The conical surface sealing is adopted between the distribution shell and the oil outlet valve tight seat to replace the original copper gasket sealing, so that the manufacturing cost is reduced.

Drawings

FIG. 1 is a diagram of the pump head oil circuit of a dispensing pump plunger equipped with an oil outlet valve according to the present invention;

wherein, 3.1, plunger; 3.2, a damping valve core; 3.4, an oil outlet valve seat; 3.1.1, plunger oil inlet groove; 3.1.5, plunger distribution groove; 3.1.7, plunger pressure relief groove; (A, B, C, D) a high pressure oil line;

FIG. 2 is a schematic view of the plunger of the dispensing pump equipped with a delivery valve of the present invention during oil supply;

1.4, distributing an oil passage in the shell; 1.5, a conical surface sealing structure is arranged between the distribution shell and the oil outlet valve tight seat;

2.2, a high-pressure oil cavity; 2.3, distributing an oil supply passage in the sleeve;

3.1.3, a ring groove; 3.1.4, an inclined oil channel at the tail part of the oil outlet valve mounting hole;

3.2.2, 4 oil inlet holes are radially arranged at the bottom of the damping valve core spring mounting hole; 3.2.3, spring mounting holes;

3.4.1, an oil passage in the oil outlet valve seat;

4.1, an oil passage in the oil outlet valve tight seat;

FIG. 3 is a schematic view showing the structure of the plunger of the dispensing pump equipped with the outlet valve of the present invention when filled with oil;

wherein, 1, a distribution shell;

1.1, distributing an oil inlet hole in the shell; 1.2, oil inlet solenoid valve mounting holes; 1.3, filling a valve seat hole;

2. a dispensing sleeve; 2.1, distributing an oil inlet hole in the sleeve;

3.3, a spring; 3.5, a pin;

4. the oil outlet valve is tightly seated; 5. a pump head plug screw; 6. a deflating screw;

FIG. 4 is a schematic view showing the structure of the plunger of the dispensing pump equipped with the delivery valve of the present invention at the end of oil supply;

3.1.1, plunger oil inlet groove; 3.1.2, a second oil drainage channel unit connected between the first oil drainage channel unit and the bottom of the plunger oil inlet groove; 3.1.6, a first oil drainage channel unit;

3.2.1, damping small holes in the valve core;

7. an oil quantity control sleeve;

FIG. 5 is an enlarged view of a portion of the outlet valve on the plunger of the dispensing pump equipped with the outlet valve of the present invention;

FIG. 6 is a schematic diagram of the structure of the plunger oil inlet groove and the distribution sleeve oil inlet hole of the present invention, wherein the oil inlet groove is not communicated with the oil inlet hole, and oil feeding is completed.

Detailed Description

The distribution pump plunger with the new structure is invented, the oil outlet valve fastening seat and the damping valve are innovatively designed, the oil outlet valve is assembled in the plunger, a fuel oil path is innovatively designed, the novel plunger is realized, and the function of four oil outlet valves of the original structure is replaced by one oil outlet valve.