CN-121993329-A - High-power electric control unit pump capable of reducing leakage of plunger

Abstract

The invention discloses a high-power electric control monoblock pump capable of reducing plunger leakage, which comprises a guide sleeve matched with an engine, a monoblock pump body, a plunger spring and a roller body, wherein the monoblock pump body, the plunger spring and the roller body are arranged in the guide sleeve, and a plunger, a sealing ring, an electromagnet, an armature, a solenoid valve spring, a control valve core, a check block and an adjusting backing plate are assembled on the monoblock pump body. The invention avoids lubricating oil from entering the fuel cavity through the plunger clearance, and reduces the engine oil consumption.

Inventors

• CHEN YINGJIE
• YAN SU
• DENG QIUMING
• LIANG WEN

Assignees

• 南岳电控（衡阳）工业技术股份有限公司

Dates

Publication Date

20260508

Application Date

20251223

Claims (1)

1. 1. A high-power electric control unit pump for reducing the leakage of plunger piston is composed of a guide sleeve matched with the engine, a unit pump body, a plunger piston spring, a roller body, a plunger piston, a sealing ring, an electromagnet, an armature, a solenoid valve spring, a control valve core, a stop block and an adjusting pad plate.

Description

High-power electric control unit pump capable of reducing leakage of plunger Technical Field The invention relates to the technical field of electric control unit pumps, in particular to a high-power electric control unit pump capable of reducing leakage of a plunger. Background With the increasing requirements of the environment protection at home and abroad, the requirements on the exhaust emission and control of the diesel engine are higher, and the performance requirements on the whole diesel engine are also higher. Compared with the traditional mechanical fuel injection pump, the electric control unit pump is adopted to better ensure the overall performance of the engine. Because high-power electronically controlled unit pumps typically require a large plunger diameter and cam lift, the amount of leakage created by the plunger clearance is excessive. On one hand, the excessive leakage of the plunger can cause the increase of the oil consumption of the engine and the decrease of the injection pressure, so as to influence the performance and the emission index of the engine, on the other hand, the leakage of diesel oil can be caused to enter a lubricating oil pipeline so as to dilute lubricating oil, so that the lubricating effect is influenced, even a camshaft and important parts such as rollers rotating relatively with the camshaft are worn, and meanwhile, a small amount of oil enters a fuel cavity through a plunger gap, so that the service life of an electric control unit pump is reduced, and the performance and the reliability of the engine are also influenced. Chinese patent application publication No. CN106593729a discloses an internal leakage preventing structure of a unit pump, which comprises a first-stage ring groove, a second-stage ring groove and a third-stage ring groove which are arranged on the inner wall of a plunger sleeve and are distributed sequentially from top to bottom along the axial direction of the plunger sleeve, wherein the first-stage ring groove is communicated with a fuel cavity through an inclined hole formed in the plunger sleeve, the third-stage ring groove is communicated with a press oil through an oil inlet channel formed in the plunger sleeve and an oil inlet hole formed in a pump body, and the second-stage ring groove is communicated with a mixed oil tank through an oil outlet channel formed in the plunger sleeve and an oil outlet hole formed in the pump body. The invention can effectively prevent fuel oil from leaking from the gap between the plunger and the plunger sleeve, avoid engine oil dilution and effectively prolong the service life of the single pump. The utility model discloses a marine heavy single pump with an external leakage prevention structure, which comprises a pump body, a plunger sleeve, a plunger, an oil quantity control pull rod, a plunger spring lower seat, a tappet body part and an oil outlet valve part, wherein the plunger sleeve, the plunger, the oil quantity control pull rod, the plunger spring lower seat, the tappet body part and the oil outlet valve part are arranged in the pump body, an oil outlet joint on the oil outlet valve body is connected with a high-pressure oil pipe through a pipe joint nut, a first oil leakage oil return hole is formed in the oil outlet valve body, a oil leakage oil return channel is arranged between the oil outlet valve body and the plunger sleeve, a second oil leakage oil return hole is arranged in the plunger sleeve, a oil leakage oil return ring cavity is arranged between the plunger sleeve and the pump body, a third oil leakage oil return hole is arranged in the pump body, and oil leakage oil between the oil outlet joint on the oil outlet valve body and the pipe joint nut and the high-pressure oil pipe flows back to the oil leakage return cavity of zero back pressure through the first oil leakage oil return hole, the oil leakage oil return channel, the second oil leakage oil return hole, the oil return ring cavity and the third oil leakage oil return hole. However, the above two patents are unreasonable in design, complex in structure and incapable of effectively reducing the leakage of the plunger. Disclosure of Invention The invention aims to solve the problems of unreasonable design, complex structure and incapability of effectively reducing plunger leakage in the prior art, and provides a high-power electric control unit pump which is reasonable in design and simple in structure, can effectively reduce leakage of an electric control unit pump caused by plunger gaps, prevents fuel from entering a lubricating oil pipeline, and can reduce the oil consumption of an engine and reduce the plunger leakage. In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows: A high-power electric control unit pump for reducing the leakage of plunger piston is composed of a guide sleeve matched with the engine, a unit pump body, a plunger piston spring, a roller body, a p