CN105952562B - Combined type high-pressure common rail pump for single-cylinder diesel engine - Google Patents
Combined type high-pressure common rail pump for single-cylinder diesel engine Download PDFInfo
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- CN105952562B CN105952562B CN201610440921.9A CN201610440921A CN105952562B CN 105952562 B CN105952562 B CN 105952562B CN 201610440921 A CN201610440921 A CN 201610440921A CN 105952562 B CN105952562 B CN 105952562B
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- common rail
- oil
- pump
- plunger
- oil outlet
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- 238000007789 sealing Methods 0.000 claims abstract description 24
- 210000001503 joint Anatomy 0.000 claims description 25
- 229910000831 Steel Inorganic materials 0.000 claims description 18
- 239000010959 steel Substances 0.000 claims description 18
- 238000009825 accumulation Methods 0.000 claims description 10
- 150000001875 compounds Chemical class 0.000 claims description 8
- 230000007704 transition Effects 0.000 claims description 6
- 238000002347 injection Methods 0.000 abstract description 6
- 239000007924 injection Substances 0.000 abstract description 6
- 238000009434 installation Methods 0.000 abstract description 4
- 230000009466 transformation Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 174
- 239000000446 fuel Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000003825 pressing Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010710 diesel engine oil Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000010729 system oil Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
- F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
- F02M59/102—Mechanical drive, e.g. tappets or cams
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/20—Varying fuel delivery in quantity or timing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
- F02M59/46—Valves
- F02M59/462—Delivery valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The combined high-pressure common rail pump for the single-cylinder diesel engine comprises a single-cylinder common rail energy accumulator and a single-cylinder common rail pump, wherein the single-cylinder common rail energy accumulator and the single-cylinder common rail pump are fixedly connected into a whole in a sealing way, the oil pump and the common rail are integrated, the installation mode of the oil pump and the diesel engine is unchanged, the oil pump can be directly installed and used on the existing diesel engine, the installation hole system of the engine body of the diesel engine is not required to be additionally processed, the common rail pipe of the common rail and the oil pump is not required to be connected, the volume of the high-pressure common rail pump of the single-cylinder diesel engine can be maximally reduced, a high-speed electromagnetic valve is adopted to replace a proportional electromagnetic valve in the prior art, and the cost can be reduced by 50-60 yuan/table; the utility model can directly carry out common rail electronic injection lifting transformation on the existing diesel engine, and the single-cylinder diesel engine can reach the national four-emission standard by using the utility model.
Description
Technical Field
The utility model relates to a combustion system of a single-cylinder diesel engine, in particular to a common rail pump assembly of a high-pressure common rail system of the single-cylinder diesel engine.
Background
For a long time, the single-cylinder diesel engine is widely applied to various industries such as standby power supply, agricultural machinery, pumping machinery, engineering machinery, ships and the like due to low price, portability and the like, and the national environmental protection emission requirement is improved and the domestic market share is gradually compressed due to the fact that the emission level of the single-cylinder diesel engine is behind in recent years; according to the data of the China internal combustion engine industry association, the output of a single-cylinder diesel engine in China is about 400 ten thousand, the peak value is about 800 ten thousand, and the holding quantity of the single-cylinder engine is about 2000 ten thousand in 2015; on one hand, the whole emission level of the single-cylinder diesel engine industry is behind, so that a large amount of harmful gas is emitted into the atmosphere each year; on the other hand, the level of emissions behind makes it increasingly excluded from the market, and the need for newer generations of technology is urgent.
China will fully implement the off-road national three emission standard at the end of 2016 and is expected to implement the off-road national 4 emission standard in 2018, where single cylinder diesel engines are within the limits of this regulation.
After the emission regulation is upgraded, a common rail system of the single-cylinder diesel engine becomes a fundamental solution for the upgrade of the emission technology of the single-cylinder diesel engine; in the technical scheme of the public common rail system of the single-cylinder diesel engine, the mechanical part comprises three parts of a common rail pump, a common rail pipe and an oil sprayer, and the three parts are connected by adopting a high-pressure oil pipe. Although the alternative technical scheme can realize high-pressure common rail electronic injection of the single-cylinder diesel, the common rail system of the existing single-cylinder diesel is too high in cost and too large in volume to be directly applied to the existing single-cylinder diesel.
The utility model patent 201610025226.6 discloses a high-pressure oil pump assembly for an integrated diesel engine high-pressure common rail fuel injection system, which still continues to the conventional technical thought, divides the mechanical part of the system into three parts and uses high-pressure oil pipes for connection; in the utility model, the tappet body guide in the high-pressure oil pump assembly depends on the diesel engine, namely, the engine body of the diesel engine needs to be redesigned, a special guide hole is reserved on the engine body, the engine body of the diesel engine needs to be redesigned and processed, and the whole processing production line needs to be newly input, so that the input is very large; meanwhile, the oil quantity control mode of the high-pressure oil pump assembly adopts oil inlet metering control of a proportional electromagnetic valve, and the electromagnetic valve has higher price.
The utility model patent ZL20110252744. X discloses a pump rail integrated common rail high-pressure pump which is applied to a multi-cylinder diesel engine oil supply system; the oil pump is driven by a self camshaft, the oil pump is huge in volume and cannot be directly applied to a single-cylinder diesel engine or cited, and in the utility model, the plunger sleeve of the high-pressure original is designed by adopting a concave end face structure, so that the manufacturability is extremely poor, the technical difficulties of processing and assembly are improved, the cost is increased, the oil pump cannot be matched with the engine body of the existing single-cylinder diesel engine, and the replacement of the oil injection pump of the existing single-cylinder diesel engine is extremely poor. None of the current single cylinder diesel manufacturers is approved and even accepted.
The utility model comprises the following steps:
the utility model aims to provide a compound high-pressure common rail pump for a single-cylinder diesel engine, which is designed according to the characteristics of the existing single-cylinder diesel engine and has the characteristics of strong adaptability, compact structure, low cost and deep technical potential.
The utility model adopts the technical scheme that:
a compound high-pressure common rail pump for a single-cylinder diesel engine is characterized in that: the oil inlet end of the single-cylinder common rail energy accumulator is fixedly connected with the oil outlet end of the single-cylinder common rail pump into a whole in a sealing manner after being butted.
Further, the single-cylinder common rail energy accumulator comprises a common rail body, a constant pressure outlet oil duct, a pressure accumulation containing cavity, a constant pressure inlet oil duct, a pressure sensor and a one-way oil outlet cavity, wherein the pressure accumulation containing cavity is arranged in the common rail body, and the constant pressure outlet oil duct, the constant pressure inlet oil duct, the pressure sensor and the one-way oil outlet cavity are all communicated with the pressure accumulation containing cavity, and the constant pressure outlet oil duct, the constant pressure inlet oil duct and the one-way oil outlet cavity are coaxially arranged; the single-cylinder common rail pump comprises a pump body, a tappet body, a plunger spring lower seat, a plunger spring, a plunger guide sleeve, a radial sealing ring, a high-pressure cavity, an oil duct distributor, steel balls, an oil inlet valve spring, an oil outlet valve seat, an oil outlet valve core, an oil outlet valve spring, an oil outlet valve seat and a high-speed electromagnetic valve, wherein the center of the oil outlet valve seat is provided with an oil outlet hole, the lower end face of the oil outlet valve seat is provided with a steel ball accommodating cavity, and the side face of the oil outlet valve seat is provided with an upper side oil duct; the center of the oil duct distributor is provided with an oil inlet blind hole with an opening at the upper end, the side surface of the oil duct distributor is provided with a lower side oil duct, the lower end of the lower side oil duct of the oil duct distributor is provided with a horizontal oil inlet duct, a vertical oil duct is arranged between the upper end surface and the lower end surface of the oil duct distributor, the lower end surface of the oil duct distributor is provided with an oil inlet concave oil pit, and the vertical oil duct is communicated with the oil inlet concave oil pit;
further, the pump body comprises a butt joint hole, a threaded connection hole, a matching hole, a transition hole, a lower guide hole, an electromagnetic valve mounting hole and a steering oil inlet duct, wherein the butt joint hole, the threaded connection hole, the matching hole, the transition hole and the lower guide hole are coaxially distributed in sequence from top to bottom; the plunger guide sleeve is rotationally fixed in a threaded connection hole of the pump body, the oil duct distributor and the oil outlet valve seat are arranged in the butt joint hole, the oil outlet valve seat is located above the oil duct distributor, the steel ball is arranged between the oil outlet valve seat and the oil duct distributor, the oil outlet valve core is sleeved in the oil outlet hole of the oil outlet valve seat, the oil inlet valve spring is arranged between the lower end of the oil outlet valve core and the steel ball, the lower end of the oil outlet valve spring is sleeved on the upper section of the oil outlet valve core, the oil outlet valve spring seat is sleeved in an inner hole at the upper end of the oil outlet valve spring, the plunger spring is sleeved on the plunger and is located at the lower end of the plunger, the plunger is sleeved in a guide hole of the plunger guide sleeve, the plunger spring is arranged between the plunger guide sleeve and the plunger spring lower seat, the tappet body is sleeved in the lower guide hole of the pump body, the lifting stroke of the tappet body is limited by the limiting pin, and the lower end of the plunger body is contacted with the tappet body.
Further, a radial sealing ring is arranged between the plunger guide sleeve and the matching hole of the pump body.
Furthermore, two radial sealing rings are arranged between the plunger guide sleeve and the matching hole of the pump body at intervals.
Further, the oil inlet end of the single-cylinder common rail accumulator and the oil outlet end of the single-cylinder common rail pump are in a butt joint structure, and the oil inlet end of the single-cylinder common rail accumulator is sleeved in a butt joint hole of the pump body.
Furthermore, the sealed butt joint structure of the oil inlet end of the single-cylinder common rail accumulator and the oil outlet end of the single-cylinder common rail pump is that the oil inlet end of the single-cylinder common rail accumulator is sleeved in a butt joint hole of the pump body, and the butt joint part of the common rail body and the pump body is provided with the sealed structure.
Furthermore, the sealing structure arranged at the butt joint position of the common rail body and the pump body is that an end face sealing ring is arranged between the butt joint surface of the common rail body and the pump body.
Furthermore, the sealing structure arranged at the butt joint of the common rail body and the pump body is that a radial sealing ring is arranged between the excircle of the oil inlet end of the single-cylinder common rail accumulator and the butt joint hole of the pump body.
The working process is as follows:
oil absorption process: when the cam shaft is in the descending section, the plunger spring drives the tappet body, the plunger spring lower seat and the plunger to synchronously descend, at the moment, the volume of the high-pressure cavity is increased to form negative pressure, an oil inlet concave oil pit at the lower end of the oil duct distributor is communicated with the containing cavity of the steel ball through a vertical oil duct, at the moment, the high-speed electromagnetic valve is electrified to be in an open state, fuel oil enters a butt joint hole of the pump body through a steering oil inlet duct and the high-speed electromagnetic valve, then enters a horizontal oil inlet duct through an upper side oil duct of the oil outlet valve seat and a lower side oil duct of the oil duct distributor to push away the steel ball, and then enters the steel ball containing cavity to suck the high-pressure cavity from the vertical oil duct;
the process of pressing oil: when the cam shaft is in the ascending stage, the tappet body pushes the lower end of the plunger to move upwards, the plunger spring is compressed under the action of the plunger spring lower seat, at the moment, the volume of the high-pressure cavity is reduced, the oil pressure is increased, fuel sucked and stored in the high-pressure cavity enters the steel ball containing cavity from the oil inlet concave oil pit and the vertical oil duct, the steel ball is pressed at the opening of the oil inlet blind hole in a sealing way under the action of pressure fuel, the oil inlet blind hole is closed, the pressure fuel pushes the oil outlet valve core to move upwards, so that the oil outlet valve core is in an opening state, the pressure fuel enters the pressure accumulating containing cavity through the constant-pressure oil inlet channel of the single-cylinder common rail accumulator, the pressure sensor measures and controls the oil pressure in the pressure accumulating containing cavity, and when the oil pressure reaches a preset value, the oil pressure is input into the oil injection device from the constant-pressure oil outlet channel, and the oil pressing process is completed.
The utility model integrates the oil pump and the common rail, the installation mode of the oil pump and the diesel engine is unchanged, the oil pump and the diesel engine can be directly installed and used on the existing diesel engine, the additional processing of the installation hole system of the engine body of the diesel engine is not needed, the common rail pipe connecting the common rail and the oil pump is canceled, the volume of the high-pressure common rail pump of the single-cylinder diesel engine can be maximally reduced, the high-speed electromagnetic valve is adopted to replace the proportional electromagnetic valve in the prior art, and the cost can be reduced by 10-15%; in the utility model, the lifting movement guiding and positioning structure of the tappet body is arranged in the inner hole of the pump body, and no special design requirement is required for the diesel engine body; the utility model can directly carry out common rail electronic injection lifting transformation on the existing diesel engine, is a very economical and feasible technical scheme for carrying out national three-standard environment-friendly emission on the existing single-cylinder diesel engine, and can lead the single-cylinder diesel engine to reach the national four-emission standard.
In the utility model, the high-pressure element plunger guide sleeve and the pump body are separated and designed into a multi-stage cylindrical structure, and the structure is circumferentially uniform and symmetrical, thereby being beneficial to high-precision processing of holes in the later plunger sleeve; compared with the special-shaped structure in the prior art, the counterweight treatment is needed, and the process difficulty is greatly reduced; the moving parts such as the tappet body, the plunger spring and the like are internally wrapped in structural design, so that the possibility of collision, interference and influence with parts of the diesel engine is avoided. The utility model has compact structure, low cost, good manufacturability and stable performance, and is suitable for the high-pressure common rail system oil supply pump assembly used for the single-cylinder diesel engine.
Description of the drawings:
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a schematic diagram of a single cylinder common rail accumulator according to the present utility model;
FIG. 3 is a schematic diagram of a single cylinder common rail pump;
FIG. 4 is a schematic view of the pump body;
FIG. 5 is a schematic diagram of the structure of the oil outlet valve seat;
FIG. 6 is a schematic view of the oil gallery distributor;
in the figure: 1-a single cylinder common rail accumulator; 2-single cylinder common rail pump; 3-end face sealing rings; 11-a common rail body; 12-pressing an oil outlet duct; 13-pressure accumulation cavity; 14-constant-pressure oil inlet duct; 15-a pressure sensor; 16-a one-way oil outlet cavity; 17-an oil inlet end; 21-a pump body; 22-tappet body; 23-plunger spring lower seat; 24-plunger spring; 25-plunger; 26-a plunger guide sleeve; 27-radial sealing rings; 28-high pressure chamber; 29-oil duct distributor; 30-steel balls; 31-an oil inlet valve spring; 32-an oil outlet valve seat; 33-an oil outlet valve core; 34-an outlet valve spring; 35-an oil outlet valve spring seat; 36-high speed solenoid valve; 37-limit pins; 38-limiting snap springs; 211-butt joint holes; 212-a threaded connection hole; 213-mating holes; 214-transition holes; 215-lower guide holes; 216-solenoid valve mounting holes; 217-steering oil inlet duct; 291-oil inlet blind hole; 292-lower side oil gallery; 293-horizontal oil inlet duct; 294-vertical oil passage; 295-an oil inlet pit; 321-oil outlet holes; 322-steel ball holding cavity; 323-upper side oil gallery.
The specific embodiment is as follows:
the following describes specific embodiments of the present utility model with reference to the drawings:
example 1: the compound high-pressure common rail pump for the single-cylinder diesel engine is composed of a single-cylinder common rail accumulator 1 and a single-cylinder common rail pump 2, wherein the single-cylinder common rail accumulator 1 and the single-cylinder common rail pump 2 are fixedly connected into a whole through a fastener and an end face sealing ring 3 as shown in figures 1-6; the single-cylinder common rail energy accumulator 1 comprises a common rail body 11, a constant pressure oil outlet channel 12, a pressure accumulation containing cavity 13, a constant pressure oil inlet channel 14, a pressure sensor 15 and a one-way oil outlet cavity 16, wherein the pressure accumulation containing cavity 13 is arranged in the common rail body 11, the constant pressure oil outlet channel 12, the constant pressure oil inlet channel 14, the pressure sensor 15 and the one-way oil outlet cavity 16 are all communicated with the pressure accumulation containing cavity 13, and the constant pressure oil outlet channel 12, the constant pressure oil inlet channel 14 and the one-way oil outlet cavity 16 are coaxially arranged; the single-cylinder common rail pump 2 comprises a pump body 21, a tappet body 22, a plunger spring lower seat 23, a plunger spring 24, a plunger 25, a plunger guide sleeve 26, a radial sealing ring 27, a high-pressure cavity 28, an oil duct distributor 29, steel balls 30, an oil inlet valve spring 31, an oil outlet valve seat 32, an oil outlet valve core 33, an oil outlet valve spring 34, an oil outlet valve seat 35 and a high-speed electromagnetic valve 36, wherein an oil outlet hole 321 is formed in the center of the oil outlet valve seat 32, a steel ball containing cavity 322 is formed in the lower end face of the oil outlet valve seat 32, and an upper side oil duct 323 is formed in the side face of the oil outlet valve seat 32; an oil inlet blind hole 291 with an upper end opening is formed in the center of the oil duct distributor 29, a lower side oil inlet duct 292 is formed in the side face of the oil duct distributor 29, a horizontal oil inlet duct 293 is formed in the lower end of the lower side oil inlet duct 292 of the oil duct distributor 29, a vertical oil duct 294 is formed between the upper end face and the lower end face of the oil duct distributor 29, an oil inlet concave oil pit 295 is formed in the lower end face of the oil duct distributor 29, and the vertical oil duct 294 is communicated with the oil inlet concave oil pit 295; the pump body 21 comprises a butt joint hole 211, a threaded connection hole 212, a matching hole 213, a transition hole 214, a lower guide hole 215, an electromagnetic valve mounting hole 216 and a steering oil inlet duct 217, wherein the butt joint hole 211, the threaded connection hole 212, the matching hole 213, the transition hole 214 and the lower guide hole 215 are coaxially distributed from top to bottom in sequence; the plunger guide sleeve 26 is rotationally fixed in a threaded connection hole 212 of the pump body 21, the oil duct distributor 29 and the oil outlet valve seat 32 are arranged in a butt joint hole 211, the oil outlet valve seat 32 is positioned above the oil duct distributor 29, the steel ball 30 is arranged between the oil outlet valve seat 32 and the oil duct distributor 29, the oil outlet valve core 33 is sleeved in an oil outlet hole 321 of the oil outlet valve seat 32, the oil inlet valve spring 31 is arranged between the lower end of the oil outlet valve core 33 and the steel ball 30, the lower end of the oil outlet valve spring 34 is sleeved on the upper section of the oil outlet valve core 33, the oil outlet valve spring seat 35 is sleeved in an inner hole at the upper end of the oil outlet valve spring 34, the plunger spring lower seat 23 is sleeved on the plunger 25 and is positioned at the lower end of the plunger 25, the plunger 25 is sleeved in a guide hole of the plunger guide sleeve 26, the plunger spring 24 is arranged between the plunger guide sleeve 26 and the plunger spring lower seat 23, the tappet body 22 is sleeved in a lower guide hole 215 of the pump body 21, the lifting stroke of the tappet body 22 is limited by the limiting pin 37, the limiting pin 37 is limited by the limiting clamp spring 38, and the lower end of the plunger 25 is contacted with the tappet 22; two radial sealing rings 27 are provided between the plunger guide sleeve 26 and the mating hole 213 of the pump body 21.
The utility model has many embodiments, and all schemes adopting other functional substitutions with the same principle as the utility model belong to the protection scope of the utility model.
Claims (7)
1. A compound high-pressure common rail pump for a single-cylinder diesel engine is characterized in that: the single-cylinder common rail energy accumulator (1) and the single-cylinder common rail pump (2) are included, the oil inlet end of the single-cylinder common rail energy accumulator (1) and the oil outlet end of the single-cylinder common rail pump (2) are fixedly connected into a whole in a sealing way after being butted, the single-cylinder common rail energy accumulator (1) comprises a common rail body (11), a constant pressure oil outlet channel (12), a pressure accumulation containing cavity (13), a constant pressure oil inlet channel (14), a pressure sensor (15) and a one-way oil outlet cavity (16), the pressure accumulation containing cavity (13) is arranged in the common rail body (11), the constant pressure oil outlet channel (12), the constant pressure oil inlet channel (14) and the one-way oil outlet cavity (16) are all communicated with the pressure accumulation containing cavity (13), wherein the constant pressure oil outlet channel (12), the constant pressure oil inlet channel (14) and the one-way oil outlet cavity (16) are coaxially arranged, the single-cylinder common rail pump (2) comprises a pump body (21), a column body (22), a plunger spring lower seat (23), a plunger spring (24), a plunger (25), a plunger guide sleeve (26), a radial cavity (27), a high-pressure sensor (15) and a high-speed solenoid valve (35), a high-speed solenoid valve (32), an oil valve (31, a high-speed solenoid valve (32) and an oil valve (32) are arranged, an oil outlet hole (321) is formed in the center of the oil outlet valve seat (32), a steel ball accommodating cavity (322) is formed in the lower end face of the oil outlet valve seat (32), and an upper side oil inlet duct (323) is formed in the side face of the oil outlet valve seat (32); an oil inlet blind hole (291) with an opening at the upper end is arranged in the center of the oil duct distributor (29), a lower side oil duct (292) is arranged on the side surface of the oil duct distributor (29), a horizontal oil inlet duct (293) is arranged at the lower end of the lower side oil duct (292) of the oil duct distributor (29), a vertical oil duct (294) is arranged between the upper end surface and the lower end surface of the oil duct distributor (29), an oil inlet pit (295) is arranged at the lower end surface of the oil duct distributor (29), and the vertical oil duct (294) is communicated with the oil inlet pit (295); the pump body (21) comprises a butt joint hole (211), a threaded connection hole (212), a matching hole (213), a transition hole (214), a lower guide hole (215), an electromagnetic valve mounting hole (216) and a steering oil inlet duct (217), wherein the butt joint hole (211), the threaded connection hole (212), the matching hole (213), the transition hole (214) and the lower guide hole (215) are coaxially distributed from top to bottom in sequence; the plunger guide sleeve (26) is rotationally fixed in a threaded connection hole (212) of the pump body (21), the oil duct distributor (29) and the oil outlet valve seat (32) are arranged in the butt joint hole (211), the oil outlet valve seat (32) is located above the oil duct distributor (29), the steel ball (30) is arranged between the oil outlet valve seat (32) and the oil duct distributor (29), the oil outlet valve core (33) is sleeved in an oil outlet hole (321) of the oil outlet valve seat (32), the oil inlet valve spring (31) is arranged between the lower end of the oil outlet valve core (33) and the steel ball (30), the lower end of the oil outlet valve spring (34) is sleeved in the upper section of the oil outlet valve core (33), the oil outlet valve spring seat (35) is sleeved in an inner hole at the upper end of the oil outlet valve spring (34), the plunger spring lower seat (23) is sleeved on the plunger (25) and located at the lower end of the plunger (25), the plunger (25) is sleeved in a guide hole of the plunger guide sleeve (26), the plunger spring (24) is arranged between the plunger guide sleeve (26) and the plunger lower seat (23), the plunger spring (22) is sleeved between the plunger guide sleeve (26) and the plunger lower seat (23), and the plunger body (22) is contacted with the plunger body (22) in the lower end of the plunger body (37) of the plunger body (22).
2. The compound high-pressure common rail pump for a single cylinder diesel according to claim 1, characterized in that: a radial sealing ring (27) is arranged between the plunger guide sleeve (26) and the matching hole (213) of the pump body (21).
3. The compound high-pressure common rail pump for a single cylinder diesel according to claim 2, characterized in that: two radial sealing rings (27) are arranged between the plunger guide sleeve (26) and the matching hole (213) of the pump body (21) at intervals along the axial direction.
4. The compound high-pressure common rail pump for a single cylinder diesel according to claim 1, characterized in that: the oil inlet end (17) of the single-cylinder common rail accumulator (1) and the oil outlet end butt joint structure of the single-cylinder common rail pump (2) are as follows: the oil inlet end (17) of the single-cylinder common rail accumulator (1) is sleeved in the butt joint hole (211) of the pump body (21).
5. The compound high-pressure common rail pump for single cylinder diesel according to claim 4, wherein: the sealing and butt joint structure of the oil inlet end (17) of the single-cylinder common rail accumulator (1) and the oil outlet end of the single-cylinder common rail pump (2) is that the oil inlet end (17) of the single-cylinder common rail accumulator (1) is sleeved in a butt joint hole (211) of a pump body (21), and a sealing structure is arranged at the butt joint position of the common rail body 11 and the pump body 21.
6. The combined high-pressure common rail pump for a single cylinder diesel according to claim 5, wherein: the sealing structure of the joint of the common rail body (11) and the pump body (21) is that an end face sealing ring (3) is arranged between the joint surface of the common rail body (11) and the pump body (21).
7. The combined high-pressure common rail pump for a single cylinder diesel according to claim 5, wherein: the sealing structure of the joint of the common rail body (11) and the pump body (21) is that a radial sealing element is arranged between the excircle of the oil inlet end (17) of the single-cylinder common rail energy accumulator (1) and the joint hole (211) of the pump body (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109268179A (en) * | 2018-10-23 | 2019-01-25 | 思达耐精密机电（常熟）有限公司 | A kind of switch electromagnetic valve formula single cylinder common rail pump of the head with pressure accumulation chamber |
| CN109139321A (en) * | 2018-11-15 | 2019-01-04 | 珠海安瑾动力科技有限公司 | A kind of two logical oil valve components of high-pressure fuel-feed pump |
| CN109253004A (en) * | 2018-11-15 | 2019-01-22 | 珠海安瑾动力科技有限公司 | A kind of High Pressure Common-Rail Fuel Inject high-pressure fuel injection pump assembly |
| CN109763925A (en) * | 2019-01-30 | 2019-05-17 | 珠海安瑾动力科技有限公司 | A kind of high-pressure fuel-feed pump pump head component |
| CN109538388A (en) * | 2019-01-30 | 2019-03-29 | 珠海安瑾动力科技有限公司 | A kind of single cylinder diesel monomer common rail pump assembly |
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