CN-122014432-A - Device for controlling starting oil quantity of mechanical oil injection pump

CN122014432ACN 122014432 ACN122014432 ACN 122014432ACN-122014432-A

Abstract

The invention discloses a device for controlling the starting oil quantity of a mechanical oil injection pump, which comprises a valve body, wherein the valve body is arranged outside a speed regulator body and is connected with the outside through an oil pipe joint screw sleeve, a cushion block and a slide valve are arranged in the valve body, a cavity is formed between the slide valve and the inside of the valve body, and after engine oil is injected into the outside, the pressure is increased to push the slide valve to axially move. The invention controls the starting oil quantity while controlling the starting enrichment, realizes the smoke control of the whole starting process of the diesel engine, and solves the problem of smoke emission of the diesel engine during starting.

Inventors

CHEN ZHIHUA
HUANG KELIANG
DENG QIUMING
LIANG WEN

Assignees

南岳电控（衡阳）工业技术股份有限公司

Dates

Publication Date: 20260512
Application Date: 20251223

Claims (3)

1. The device for controlling the starting oil quantity of the mechanical oil injection pump comprises a valve body, wherein the valve body is arranged outside a speed regulator body and is connected with the outside through an oil pipe joint screw sleeve, a cushion block and a slide valve are arranged in the valve body, a cavity is formed between the slide valve and the inside of the valve body, after engine oil is injected into the outside, the pressure is increased, and the slide valve is pushed to axially move, and the device is characterized by further comprising: The valve body and the slide valve are sleeved on the linkage shaft; a first retainer ring mounted on the linkage shaft, the first retainer ring being in contact with the spool valve; the first adjusting gasket is arranged on the linkage shaft and is attached to the inner wall of the speed regulator body; an inner spring and an outer spring sleeved on the linkage shaft and positioned between the first adjusting gasket and the slide valve; the device comprises a linkage shaft rocker arm, a bolt, a two-stage step, a first-stage step and a second-stage step, wherein the linkage shaft rocker arm is rotatably connected to the linkage shaft and moves along with the linkage shaft; The second check ring is arranged on the linkage shaft and is adjacent to one side, facing the first check ring, of the rocker arm of the linkage shaft; the linkage shaft rocker arm is positioned between the linkage shaft sliding sleeve and the second check ring; the linkage shaft spring is sleeved on the linkage shaft, and one end of the linkage shaft spring acts on the linkage shaft sliding sleeve; The second adjusting gasket is arranged on the linkage shaft, and the other end of the linkage shaft spring acts on the second adjusting gasket; a transmission rod arranged in the external boost compensator, a notch is arranged on the transmission rod, a bolt on the rocker arm of the linkage shaft is limited in the notch of the transmission rod, The toothed bar is arranged in the external fuel injection pump body and can only axially move; the toothed bar connecting rod is connected with the rack and the toothed bar through a spring piece and a pull rod; a barb plane on the rack bar connecting rod; the first adjusting gasket, the starting spring hanging lug and the transmission rod keep relatively static in the moving process; One end of the starting spring is connected to the starting spring hanging lug, and the other end of the starting spring is connected to the toothed bar connecting rod; The starting oil quantity is controlled, the smoke intensity is large when the diesel engine starts, the starting enrichment device takes effect when the diesel engine starts, engine oil is injected into the valve body, the pressure of the engine oil is larger than the resultant force of the outer spring, the inner spring and the linkage shaft spring, so that the linkage shaft rocker arm moves axially, the bolt head of the linkage shaft rocker arm moves relatively to the barb plane on the linkage shaft rocker arm, at the moment, the barb plane on the linkage shaft rocker arm is positioned on a second step of the linkage shaft rocker arm, the whole process is from the control of the first step to the control of the second step boost compensator to control the low speed, the control of the smoke intensity when the diesel engine starts is realized, and the smoke intensity control of the whole diesel engine is realized when the control of the starting oil quantity is realized.
2. The device for controlling the starting oil quantity of a mechanical oil injection pump according to claim 1, wherein one end of the toothed bar connecting rod far away from the toothed bar is connected with a swinging arm through a bolt, the swinging arm rotates around the bolt by a certain angle, and the other end of the starting spring is connected with the swinging arm.
3. A device for controlling the starting oil quantity of a mechanical oil injection pump according to claim 1, characterized in that in the non-starting state of the diesel engine, the installation length of the starting spring is longer than that in the free state, so that the starting spring provides a pulling force, and the swinging arm drags the rest of the connecting pieces under the action of the pulling force, so that the toothed bar is driven to move towards the oil quantity increasing direction.

Description

Device for controlling starting oil quantity of mechanical oil injection pump Technical Field The invention relates to the field of fuel injection pump assemblies of diesel engines, in particular to a device for controlling the starting fuel quantity of a mechanical fuel injection pump. Background Diesel engines are widely used in the fields of automobiles, engineering machinery, agricultural machinery, generator sets and the like with high torque, high reliability and good fuel economy. However, emissions problems of diesel engines, particularly soot emissions during cold starts, are a continuing concern and solution to those skilled in the art. During cold start of the diesel engine, the temperature in the cylinder is low, the fuel atomization, evaporation and air mixing quality are poor, meanwhile, the engine speed is low, the air inlet vortex is weak, and the formation condition of the mixed gas is further deteriorated. To ensure that the engine can start reliably and quickly in a low temperature environment, existing control strategies typically employ a start enrichment mode, i.e., injecting a stoichiometric amount of fuel during the start phase that exceeds that required for normal operating conditions. The excessive fuel is favorable for forming combustible mixture, and the temperature in the cylinder is increased by utilizing the combustion of part of fuel, so that the evaporation and combustion of the fuel injected subsequently are promoted, and the starting success is ensured. This way of starting the enrichment has the significant disadvantage that, since the amount of enrichment is fixed and in order to guarantee the starting properties under worst-case conditions, the uncontrolled amount of enrichment is often biased to be conservative (i.e. to be large). In the actual starting process, especially under the condition that the ambient temperature is not very low, excessive fuel oil cannot be fully mixed with air in a short time and is completely combusted, a large amount of unburned or partially combusted hydrocarbon and soot are generated, the exhaust smoke degree is rapidly increased, obvious black smoke is generated, the environment is polluted, and the user experience is also influenced. Under the traditional strategy, higher starting smoke intensity has to be tolerated in order to ensure starting reliability, and if the enriched oil amount is reduced for too much smoke intensity reduction, the risks of difficult starting, prolonged starting time and even starting failure are also encountered. Therefore, in order to solve the above-mentioned problems, there is a need for an accurate and adjustable device for controlling the start-up enrichment process, which can maximally suppress the occurrence of black smoke while ensuring the cold start reliability of the diesel engine. Disclosure of Invention The invention aims to solve the technical problem of the existing diesel engine starting enrichment mode and provides a device for controlling the starting oil quantity of a mechanical oil injection pump, which can accurately adjust the enrichment oil quantity during starting to control smoke intensity. The technical problems to be solved by the invention can be realized by the following technical scheme: The device for controlling the starting oil quantity of the mechanical oil injection pump comprises a valve body, wherein the valve body is arranged outside a speed regulator body and is connected with the outside through an oil pipe joint screw sleeve, a cushion block and a slide valve are arranged in the valve body, a cavity is formed between the slide valve and the inside of the valve body, after engine oil is injected into the outside, the pressure is increased, and the slide valve is pushed to axially move, and the device is characterized by further comprising: The valve body and the slide valve are sleeved on the linkage shaft; a first retainer ring mounted on the linkage shaft, the first retainer ring being in contact with the spool valve; the first adjusting gasket is arranged on the linkage shaft and is attached to the inner wall of the speed regulator body; an inner spring and an outer spring sleeved on the linkage shaft and positioned between the first adjusting gasket and the slide valve; the device comprises a linkage shaft rocker arm, a bolt, a two-stage step, a first-stage step and a second-stage step, wherein the linkage shaft rocker arm is rotatably connected to the linkage shaft and moves along with the linkage shaft; The second check ring is arranged on the linkage shaft and is adjacent to one side, facing the first check ring, of the rocker arm of the linkage shaft; the linkage shaft rocker arm is positioned between the linkage shaft sliding sleeve and the second check ring; the linkage shaft spring is sleeved on the linkage shaft, and one end of the linkage shaft spring acts on the linkage shaft sliding sleeve; The second adjusting gasket is arranged on the linkage shaft, and