CN111720246A - Electric control unit pump - Google Patents
Electric control unit pump Download PDFInfo
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- CN111720246A CN111720246A CN202010510309.0A CN202010510309A CN111720246A CN 111720246 A CN111720246 A CN 111720246A CN 202010510309 A CN202010510309 A CN 202010510309A CN 111720246 A CN111720246 A CN 111720246A
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- 238000013016 damping Methods 0.000 claims abstract description 70
- 238000003825 pressing Methods 0.000 claims abstract description 24
- 230000006835 compression Effects 0.000 claims abstract description 20
- 238000007906 compression Methods 0.000 claims abstract description 20
- 239000000446 fuel Substances 0.000 claims description 12
- 238000009434 installation Methods 0.000 claims description 6
- 210000001503 joint Anatomy 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 abstract description 5
- 239000003921 oil Substances 0.000 description 100
- 239000000295 fuel oil Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 10
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000003754 machining Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000005429 filling process Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 210000004907 gland Anatomy 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/04—Pumps peculiar thereto
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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
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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
- F02M59/48—Assembling; Disassembling; Replacing
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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
- F02M59/48—Assembling; Disassembling; Replacing
- F02M59/485—Means for fixing delivery valve casing and barrel to each other or to pump casing
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention discloses an electric control monoblock pump, which comprises: the device comprises a plunger, a pump body, a pump nozzle, a damping valve assembly, a coil, an armature, an electromagnet pressing block, a control valve assembly, a valve sleeve, a bottom limiting block and a compression nut; the plunger is coaxially arranged in a plunger cavity of the pump body; the bottom of the pump nozzle is arranged in a pump nozzle mounting hole of the pump body, and the top of the pump nozzle is connected with the oil injector through a high-pressure oil pipe; the damping valve assembly is arranged in a damping mounting hole of the pump nozzle; the compression nut is fixed at the bottom of an inner hole of the cylindrical boss of the pump body, and the bottom limiting block is supported at the top of the compression nut; the valve sleeve is arranged in an inner hole of a cylindrical boss of the pump body in an interference fit manner through a hole shaft and is positioned above the bottom limiting block; the control valve assembly is arranged in the valve sleeve, and the top of the control valve assembly is provided with the armature; the invention has reasonable structural layout, reduces the integral processing difficulty and improves the precision.
Description
Technical Field
The invention belongs to the technical field of engines, and particularly relates to an electronic unit pump.
Background
Compared with a gasoline engine, the diesel engine has the advantages of low fuel consumption rate, excellent emission performance and the like. The global vehicular power "diesel" trend has been developed. At present, diesel engines are being developed for higher speeds, lighter weights, and higher strengths. For fuel systems, high injection pressures and high injection rates are required for the duration of the injection. The electric control monoblock pump and the high-pressure common rail technology are electric injection technologies which are widely applied at present, and both the electric control monoblock pump and the high-pressure common rail technology can realize high-pressure injection and independent cylinder control. In view of the existing machining technology level and oil products in China, the structural reliability and durability of the high-pressure common rail system are difficult to solve. The electronic control unit pump fuel oil system becomes one of ideal choices of a high-power diesel engine due to the advantages of high injection pressure, small change to the existing engine, good oil product adaptability, excellent system reliability and the like. At present, domestic common electric control unit pumps comprise Boshi electric control unit pumps and Delfu electric control unit pumps.
The bosch electric control monoblock pump is structurally shown in figures 1 and 2, a transverse oil passage above a pump body is an electromagnetic valve control oil passage, an annular oil cavity A, B, F and an oil passage D, G are low-pressure oil passages, and a plunger cavity C and an oil passage E are high-pressure oil passages. After the electromagnetic valve is electrified, the armature and the cone valve are driven to move rightwards, so that a channel between high-pressure and low-pressure oil ways is cut off, and high pressure is established; the structure is characterized in that the control oil duct and the main oil duct are in an accurate vertical relation.
The delfu electrically controlled monoblock pump works on the same principle as bosch, but with a great difference in the structural form, as shown in fig. 3. The delfu electric control unit pump integrates an electromagnetic valve into the pump body, and controls the connection and disconnection of the high-pressure oil circuit and the low-pressure oil circuit by controlling the valve body to move up and down through the electromagnetic valve.
However, the bosch electric control unit pump and the delfu electric control unit pump in the current country have the following defects:
boshi automatically controlled monoblock pump defect:
1. the coil is transversely arranged, the occupied space is large, and the arrangement on an engine is difficult.
2. There is no slot in the travel stop and oil in the control valve may create an oil cushion when the control valve is moved to the left.
3. The cover plate needs to be screwed down by bolts, so bolt holes need to be machined in the pump body, and the size of the pump body can be increased in order to reserve positions for the bolt holes.
Defects of the delfu electric control unit pump:
1. the requirement on the machining precision of the large sealing plane at the lower end of the valve body is high, the requirement on the parallelism is high, and the requirement is not easy to guarantee.
2. The matching surface between the pump nozzle and the damping valve has high precision requirement and is not easy to process.
Disclosure of Invention
In view of this, the invention provides an electronic unit pump, which is improved on the basis of the two schemes, has reasonable structural layout, reduces the overall processing difficulty and improves the precision.
The invention is realized by the following technical scheme:
an electrically controlled monoblock pump comprising: the device comprises a plunger, a pump body, a pump nozzle, a damping valve assembly, a coil, an armature, an electromagnet pressing block and a control valve assembly; it is characterized by also comprising: the valve sleeve, the bottom limiting block and the compression nut;
a plunger cavity is formed in one end of the pump body, a pump nozzle mounting hole coaxial with the plunger cavity is formed in the other end of the pump body, the pump nozzle mounting hole is communicated with the plunger cavity through a first axial hole, a cylindrical boss extends out of the end, where the pump nozzle mounting hole is located, of the pump body, the axis of the cylindrical boss is parallel to the axis of the pump nozzle mounting hole, and the inner hole of the cylindrical boss is communicated with the first axial hole through a first radial hole; the first radial hole and the first axial hole which are communicated form a high-pressure oil duct; a low-pressure oil duct is processed in the pump body, one end of the low-pressure oil duct is communicated with an external oil path, the other end of the low-pressure oil duct is communicated with an inner hole of the cylindrical boss, and the low-pressure oil duct is not communicated with the plunger cavity;
the plunger is coaxially arranged in a plunger cavity of the pump body, and can perform linear reciprocating motion in the plunger cavity along the axial direction of the plunger;
the bottom of the pump nozzle is arranged in a pump nozzle mounting hole of the pump body, the top of the pump nozzle is connected with the oil injector through a high-pressure oil pipe, a second axial hole is formed in the bottom of the pump nozzle, and a damping mounting hole communicated with the second axial hole is formed in the top of the pump nozzle; the second axial hole is butted and communicated with the first axial hole of the pump body;
the damping valve assembly is arranged in a damping mounting hole of the pump nozzle and is used for preventing pressure waves from enabling the fuel injector to start spraying for the second time;
the compression nut is fixed at the bottom of an inner hole of the cylindrical boss of the pump body, and the bottom limiting block is supported at the top of the compression nut; the bottom limiting block is a three-section stepped cylinder, and the lower end face of the section with the largest diameter is supported on the compression nut; an annular oil duct is formed between the outer circumferential surface of the section with the smallest diameter of the bottom limiting block and the inner circumferential surface of the inner hole of the cylindrical boss of the pump body, and the annular oil duct is communicated with a low-pressure oil duct in the pump body;
the valve sleeve is arranged in an inner hole of a cylindrical boss of the pump body in an interference fit mode through a hole shaft and is positioned above the bottom limiting block, a set distance is reserved between the valve sleeve and the upper end face of the section with the smallest diameter of the bottom limiting block, and a first annular inclined plane is machined on the inner circumferential surface of the bottom of the valve sleeve; a second radial hole is processed on the valve sleeve and communicated with the first radial hole of the pump body in a butt joint mode, namely communicated with a high-pressure oil duct of the pump body;
the control valve assembly is arranged in the valve sleeve, and the top of the control valve assembly is provided with an armature; the coil is tightly pressed and installed at the top of the cylindrical boss of the pump body through the electromagnet pressing block, and the lower surface of the coil is opposite to the upper surface of the armature; an annular groove is processed on the outer circumferential surface of the control valve assembly and is communicated with a second radial hole of the valve sleeve, the lower side surface of the annular groove is processed into a second annular inclined surface matched with the first annular inclined surface, and the outer diameter of the end, where the second annular inclined surface is located, of the control valve assembly is larger than the inner diameter of the valve sleeve; when the coil is not electrified, the bottom of the control valve assembly is supported on the upper end face of the section with the smallest diameter of the bottom limiting block, a gap is reserved between the second annular inclined surface of the control valve and the first annular inclined surface, and the annular oil cavity is communicated with the high-pressure oil passage of the pump body sequentially through the gap between the second annular inclined surface and the first annular inclined surface, the annular groove of the control valve and the second radial hole of the valve sleeve; when the coil is electrified, the control valve moves upwards to the state that the second annular inclined surface is in contact with the first annular inclined surface, and the annular oil cavity is not communicated with the high-pressure oil duct.
Further, a strip-shaped slot is machined in the center of the upper end face of the section with the smallest diameter of the bottom limiting block; the control valve assembly is of a hollow structure, and an inner hole of the control valve assembly is communicated with the annular oil duct through a strip-shaped groove of the bottom limiting block.
Furthermore, the step surface between the maximum diameter section and the secondary diameter section of the bottom limiting block is matched with an annular boss processed in an inner hole of the cylindrical boss of the pump body.
Furthermore, the pump nozzle mounting hole of the pump body is a threaded hole, and the pump nozzle is mounted in the pump nozzle mounting hole of the pump body through threads.
Further, the pump nozzle mounting hole of the pump body is a unthreaded hole, and the pump nozzle is mounted in the pump nozzle mounting hole of the pump body through interference fit.
Further, the control valve assembly includes: the height adjusting block, the upper limiting block, the control valve spring, the lower limiting block and the control valve are arranged on the upper end face of the lower limiting block;
the control valve is sleeved in the valve sleeve; the control valve is of a hollow structure, an annular groove is formed in the outer circumferential surface of the control valve and is communicated with a second radial hole of the valve sleeve, a second annular inclined surface matched with the first annular inclined surface is formed in the lower side surface of the annular groove, and the outer diameter of the end, where the second annular inclined surface is located, of the control valve is larger than the inner diameter of the valve sleeve; when the control valve is supported on the upper end face of the section with the minimum diameter of the bottom limiting block, a gap is reserved between a second annular inclined face of the control valve and the first annular inclined face, and the annular oil cavity is communicated with the high-pressure oil duct of the pump body sequentially through the gap between the second annular inclined face and the first annular inclined face, the annular groove of the control valve and the second radial hole of the valve sleeve; when the control valve moves upwards until the second annular inclined surface is contacted with the first annular inclined surface, the annular oil cavity is not communicated with the high-pressure oil duct; the top of the control valve extends out of the valve sleeve and is fixedly connected with the armature;
the height adjusting block is of an annular structure and is sleeved on a step surface of the inner circumferential surface of an inner hole of the cylindrical boss of the pump body;
the upper limiting block and the lower limiting block are respectively sleeved on the upper end and the lower end of the control valve extending out of the valve sleeve part, wherein the lower limiting block is supported on a step surface processed on the outer circumferential surface of the control valve;
the control valve spring is installed on the control valve and extends out of the valve sleeve part, and two ends of the control valve spring are respectively abutted against the upper limiting block and the lower limiting block.
Further, the damping valve assembly includes: the damping valve core, the damping spring and the damping pressing block;
the damping valve core is arranged on the inner bottom surface of the damping mounting hole of the pump nozzle, the damping pressing block is arranged at the upper part in the damping mounting hole of the pump nozzle in an interference fit manner, the damping spring is arranged between the damping valve core and the damping pressing block and is in a compressed state, and two ends of the damping spring are respectively contacted with the damping valve core and the damping pressing block; and the damping valve core is provided with a through hole communicated with the second axial hole, and the damping pressing block is provided with a nozzle.
Has the advantages that: (1) a damping valve assembly is required to be installed at a pump nozzle of the electric control monoblock pump to prevent pressure waves from enabling the oil injector to start spraying for the second time, so that the precision of the damping installation hole of the pump nozzle is required to be high; the pump nozzle and the pump body of the electric control monoblock pump in the Bosch scheme in the prior art are designed in an integrated manner, so that the processing is difficult, and the coaxiality and the verticality of the inner hole of the pump nozzle are difficult to ensure; the pump nozzle and the pump body are designed in a split mode, the pump nozzle is machined independently, the pump nozzle damping mounting hole and the second axial hole are integrally through holes, machining difficulty is greatly reduced, machining accuracy can be effectively guaranteed, the pump nozzle is connected with the pump body through threads, the hexagonal head is machined on the outer circumferential surface of the pump nozzle, the hexagonal head can be directly screwed into the pump body through a socket wrench, and the pump nozzle and the pump body are simple and convenient in structure and easy to achieve.
(2) In the delfu electric control unit pump in the prior art, the control valve assembly is tightly pressed on the pump body through the nut, so that the control valve assembly is partially complex in structure and difficult to install; the bosch electric control monoblock pump scheme in the prior art adopts a valveless structure, and the surface matched with the control valve is directly processed on the pump body, so that the processing is difficult, and the pump body and the control valve cannot be replaced after being worn; the invention does not directly process a hole and a surface matched with the control valve on the pump body (such as a Bosch scheme), but adopts a detachable valve sleeve to be arranged between the pump body and the control valve; the valve sleeve and the pump body are in interference fit, a nut is not required to be pressed tightly, the valve sleeve and the pump body can be separately processed, the precision of a surface matched with the control valve is easily ensured, and the structure of the control valve assembly is simplified; after the valve sleeve is abraded, the valve sleeve can be continuously used after being replaced, and the service life of the electric control monoblock pump can be effectively prolonged.
(3) In the Boshi electric control monoblock pump in the prior art, a stroke limiting block is designed, but no groove is formed, fuel oil in an inner hole of a control valve can generate an oil cushion effect when the control valve moves leftwards, and a rightward force F is formed, so that the movement of the control valve is influenced; the bottom limiting block is provided with the groove, namely a strip-shaped groove is machined in the center of the upper end face of the section with the smallest diameter of the bottom limiting block; when the control valve falls onto the bottom limiting block, fuel in the inner hole of the control valve flows into the annular oil duct through the strip-shaped slot of the bottom limiting block, so that the phenomenon that the pressure in the inner hole of the control valve is too high to generate an oil cushion effect is avoided, and the motion of the control valve is influenced.
(4) The step surface between the largest diameter section and the second largest diameter section of the bottom limiting block is matched with the annular boss processed in the inner hole of the cylindrical boss of the pump body, so that the bottom limiting block is positioned in the inner hole of the cylindrical boss of the pump body; the radial positioning surface along the vertical direction can ensure the coaxiality of the bottom limiting block and the control valve and prevent the bottom limiting block from jumping radially; the axial positioning surface along the horizontal direction can ensure the axial distance between the bottom limiting block and the valve sleeve, thereby ensuring the axial movement stroke of the control valve.
(5) The structure of the electromagnet pressing block is similar to that of the nut, the coil is pressed through the electromagnet pressing block, the number of parts is reduced to the maximum extent, the structure of the control valve assembly is greatly simplified, and the split design of the pump nozzle and the pump body does not influence the processing of the threads of the pump body matched with the electromagnet pressing block.
(6) The coils of the invention are vertically arranged, so that the volume of the single pump is reduced.
(7) The design of the compression nut is adopted, the compression nut can play a role of a cover plate and can be directly fixed on the pump body through threaded connection, a threaded hole does not need to be additionally machined, and the size of the single pump is effectively reduced;
(8) the inner hole of the cylindrical boss of the pump body is a through hole, so that a plane which is large and has high precision requirement does not need to be processed on the pump body, and the pump body is easy to process.
Drawings
Fig. 1 to 2 are structural diagrams of a conventional bosch electronic control unit pump;
FIG. 3 is a diagram of a conventional delfu electric control unit pump;
FIG. 4 is a structural component diagram of the present invention;
FIG. 5 is a schematic illustration of the location of the low pressure gallery;
FIG. 6 is a structural component view of a damper valve assembly;
FIG. 7 is a schematic structural view of a bottom stopper;
FIG. 8 is a top view of a bottom stop block;
FIG. 9 is a structural component view of the control valve assembly;
fig. 10 is an assembled view of the valve sleeve;
FIG. 11 is a flow line diagram of fuel from the low pressure gallery to the high pressure gallery;
wherein, 1-spring seat; 2-a plunger spring; 3-a plunger; 4-a pump body; 5-pump nozzle; 6-damping valve core; 7-a damping spring; 8-damping briquetting; 9-a coil; 10-pressing the electromagnet block; 11-a screw; 12-an armature; 13-a height adjustment block; 14-an upper limit block; 15-control valve spring; 16-a lower limit block; 17-a valve housing; 18-a control valve; 19-a bottom stopper; 20-a compression nut; 21-low pressure oil channel, 22-strip-shaped slot and 23-annular oil cavity.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The present embodiment provides an electrically controlled unit pump, referring to fig. 4, including: the device comprises a spring seat 1, a plunger spring 2, a plunger 3, a pump body 4, a pump nozzle 5, a damping valve assembly, a valve sleeve 17, a coil 9, an electromagnet pressing block 10, a control valve assembly, a bottom limiting block 19 and a compression nut 20;
a plunger cavity is formed in one end of the pump body 4, a pump nozzle mounting hole coaxial with the plunger cavity is formed in the other end of the pump body 4, the pump nozzle mounting hole is communicated with the plunger cavity through a first axial hole, a cylindrical boss extends out of the end, where the pump nozzle mounting hole is located, of the pump body 4, the axis of the cylindrical boss is parallel to the axis of the pump nozzle mounting hole, and the inner hole of the cylindrical boss is communicated with the first axial hole through a first radial hole; the first radial hole and the first axial hole which are communicated form a high-pressure oil duct; referring to fig. 5, a low-pressure oil passage 21 is formed in the pump body 4, one end of the low-pressure oil passage 21 is communicated with an external oil passage, the other end of the low-pressure oil passage 21 is communicated with an inner hole of the cylindrical boss, and the low-pressure oil passage 21 is not communicated with the plunger cavity;
one end of the plunger 3 is coaxially arranged in a plunger cavity of the pump body 4, the plunger 3 can perform linear reciprocating motion in the plunger cavity along the axial direction of the plunger, the other end of the plunger 3 extends out of the pump body 4 and is connected with the spring seat 1, the plunger spring 2 is sleeved outside the part of the plunger 3 extending out of the pump body 4, and two ends of the plunger spring 2 are respectively connected with the pump body 4 and the spring seat 1;
referring to fig. 6, the bottom of the pump nozzle 5 is installed in a pump nozzle installation hole of the pump body 4 through a thread (at this time, the pump nozzle installation hole is a threaded hole), the top of the pump nozzle 5 is connected with the fuel injector through a high-pressure fuel pipe, the bottom of the pump nozzle 5 is provided with a second axial hole, and the top of the pump nozzle 5 is provided with a damping installation hole communicated with the second axial hole; the second axial hole is butted and communicated with the first axial hole of the pump body 4; the hexagonal head is machined in the middle of the outer circumferential surface of the pump nozzle 5, so that the pump nozzle 5 can be directly screwed into the pump body 4 through a socket wrench; the pump nozzle 5 can also be arranged in a pump nozzle mounting hole of the pump body 4 in an interference fit manner (at the moment, the pump nozzle mounting hole is a unthreaded hole);
the damping valve assembly is installed in the damping mounting hole of pump mouth 5, and the damping valve assembly is used for preventing the pressure wave (the pressure wave is the pressure oscillation that produces in high pressure fuel pipe when the sprayer closes) makes the sprayer secondary start-up spout, wherein, the damping valve assembly includes: a damping valve core 6, a damping spring 7 and a damping pressure block 8; the damping valve core 6 is arranged on the inner bottom surface of the damping mounting hole of the pump nozzle 5, the damping pressing block 8 is arranged at the upper part in the damping mounting hole of the pump nozzle 5 in an interference fit manner, the damping spring 7 is arranged between the damping valve core 6 and the damping pressing block 8 and is in a compression state, and two ends of the damping spring are respectively abutted against the damping valve core 6 and the damping pressing block 8; wherein, the damping valve core 6 is provided with a through hole communicated with the second axial hole, and the damping pressing block 8 is provided with a nozzle;
the compression nut 20 is fixed at the bottom of an inner hole of a cylindrical boss of the pump body 4 through threads, and the bottom limiting block 19 is supported at the top of the compression nut 20;
referring to fig. 7-8, the bottom limiting block 19 is a three-section stepped cylinder, the lower end face of the section with the largest diameter is supported on the gland nut 20, and the step surface between the section with the largest diameter and the section with the second largest diameter is matched with an annular boss processed in the inner hole of the cylindrical boss of the pump body 4, so as to position the bottom limiting block 19 in the inner hole of the cylindrical boss of the pump body 4; an annular oil passage is formed between the outer circumferential surface of the section with the minimum diameter of the bottom limiting block 19 and the inner circumferential surface of the inner hole of the cylindrical boss of the pump body 4, and the annular oil passage is communicated with a low-pressure oil passage 21 in the pump body 4; a strip-shaped slot 22 is processed in the center of the upper end face of the section with the smallest diameter of the bottom limiting block 19;
referring to fig. 10, the valve sleeve 17 is installed in the inner hole of the cylindrical boss of the pump body 4 by interference fit of a hole shaft, is located above the bottom limiting block 19, has a set distance with the upper end surface of the section with the smallest diameter of the bottom limiting block 19, and is provided with a first annular inclined surface on the inner circumferential surface of the bottom of the valve sleeve 17; a second radial hole is formed in the valve sleeve 17, and the second radial hole is in butt joint communication with the first radial hole of the pump body 4, namely is communicated with a high-pressure oil duct of the pump body 4;
the control valve assembly is arranged in the valve sleeve 17 and is positioned above the bottom limiting block 19; referring to fig. 9, the control valve assembly includes: an armature 12, a height adjusting block 13, an upper limit block 14, a control valve spring 15, a lower limit block 16 and a control valve 18;
the control valve 18 is sleeved in the valve sleeve 17; the control valve 18 is of a hollow structure, an annular groove is formed in the outer circumferential surface of the control valve 18 and is communicated with a second radial hole of the valve sleeve 17, a second annular inclined surface matched with the first annular inclined surface is formed on the lower side surface of the annular groove, and the outer diameter of the end, where the second annular inclined surface of the control valve 18 is located, is larger than the inner diameter of the valve sleeve 17; when the control valve 18 is supported on the upper end surface of the section with the smallest diameter of the bottom limiting block 19, a gap is reserved between the second annular inclined surface of the control valve 18 and the first annular inclined surface, and the annular oil chamber 23 is communicated with the high-pressure oil passage of the pump body 4 sequentially through the gap between the second annular inclined surface and the first annular inclined surface, the annular groove of the control valve 18 and the second radial hole of the valve sleeve 17; when the control valve 18 moves upward until the second annular slope comes into contact with the first annular slope, the annular oil chamber 23 is not communicated with the high-pressure oil passage; wherein, the inner hole of the control valve 18 is always communicated with the annular oil passage through the strip-shaped slot 22 of the bottom limiting block 19; the top of the control valve 18 protrudes out of the valve sleeve 17, and the top is fixedly connected with the armature 12 through a screw 11;
the height adjusting block 13 is of an annular structure and is sleeved on a step surface of the inner circumferential surface of an inner hole of the cylindrical boss of the pump body 4;
the upper limit block 14 and the lower limit block 16 are respectively sleeved on the upper end and the lower end of the control valve 18 extending out of the valve sleeve 17, wherein the lower limit block 16 is supported on a step surface processed on the outer circumferential surface of the control valve 18;
the control valve spring 15 is arranged on the control valve 18 and extends out of the valve sleeve 17, two ends of the control valve spring 15 respectively abut against the upper limit block 14 and the lower limit block 16, the upper limit block 14 is pressed on the lower end face of the height adjusting block 13 under the action of the pre-tightening force of the control valve spring 15, and the lower limit block 16 is pressed on the step face of the control valve 18;
the coil 9 is supported on the upper end surface of the height adjusting block 13; the electromagnet pressing block 10 is connected to the top of the cylindrical boss of the pump body 4 through threads, the coil 9 is pressed on the upper end face of the height adjusting block 13 through a step face arranged on the outer circumferential face of the coil 9, the lower surface of the coil 9 is opposite to the upper surface of the armature 12, and the size of an air gap between the lower surface of the coil 9 and the upper surface of the armature 12 can be changed by changing the height of the height adjusting block 13.
The working principle is as follows: when the monoblock pump works, the low-pressure oil duct 21, the annular oil chamber 23, the second radial hole of the valve sleeve 17, the high-pressure oil duct, the plunger cavity and the inner hole of the control valve 18 are all filled with fuel oil;
in the oil charging process and the oil returning process of the monoblock pump, the coil 9 is in a power-off state, at the moment, the control valve 18 is supported on the upper end face of the section with the minimum diameter of the bottom limiting block 19, a gap is reserved between the second annular inclined plane of the control valve 18 and the first annular inclined plane, and the annular oil cavity 23 is communicated with the high-pressure oil passage of the pump body 4 sequentially through the gap between the second annular inclined plane and the first annular inclined plane, the annular groove of the control valve 18 and the second radial hole of the valve sleeve 17;
the external oil supply cam pushes the plunger 3 to move upwards by overcoming the compression force of the plunger spring 2 through the plunger spring 1; when the oil supply cam passes through, the plunger 3 moves downwards under the action of the restoring force of the plunger spring 2, so that the reciprocating motion of the plunger 3 is realized;
the oil filling process comprises the following steps: when the plunger 3 moves downwards, the oil pressure in the plunger cavity of the pump body 4 is lower than the oil pressure in the low-pressure oil passage 21, at this time, referring to fig. 11, the fuel in the fuel tank enters the plunger cavity of the pump body 4 after sequentially passing through the low-pressure oil passage 21 of the pump body 4, the annular oil cavity 23, the gap between the second annular inclined surface and the first annular inclined surface, the annular groove of the control valve 18, the second radial hole of the valve sleeve 17 and the high-pressure oil passage of the pump body 4, and the oil filling process is completed;
the oil return process comprises the following steps: when the plunger 3 moves upwards, fuel oil in the plunger cavity of the pump body 4 is compressed, so that the oil pressure in the plunger cavity rises and is higher than the oil pressure in the low-pressure oil duct 21, and at the moment, the fuel oil in the plunger cavity of the pump body 4 flows back into the oil tank after sequentially passing through the high-pressure oil duct of the pump body 4, the second radial hole of the valve sleeve 17, the annular groove of the control valve 18, the gap between the second annular inclined surface and the first annular inclined surface, the annular oil cavity 23 and the low-pressure oil duct 21 of the pump body 4, so that the oil return process is completed;
the high-pressure fuel oil of the monoblock pump is generated as follows: in the process that the plunger 3 moves upwards, an external ECU (namely a controller) gives a control pulse at a set time, the coil 9 is electrified through a driving circuit, the coil 9 is electrified to generate magnetic force to drive the control valve 18 to move upwards through the armature 1, when the second annular inclined plane is abutted against the first annular inclined plane, the annular oil cavity 23 is not communicated with the high-pressure oil channel, the high-pressure oil channel is disconnected with the low-pressure oil channel 21, a closed volume is formed in the plunger cavity of the pump body 4, fuel oil in the plunger cavity of the pump body 4 is compressed along with the continuous upward movement of the plunger 3, so that the oil pressure in the plunger cavity rises to form high-pressure fuel oil, and after the oil pressure in the plunger cavity reaches a set value, the high-pressure fuel oil in the plunger cavity is sprayed out by the pump nozzle 5, and finally the sprayed high-;
the unloading process of the high-pressure fuel oil of the monoblock pump is as follows: after the control pulse of the external ECU is finished, the coil 9 is powered off, the control valve 18 moves downwards under the action of the control valve spring 15 until the control valve 18 is supported on the upper end face of the section with the minimum diameter of the bottom limiting block 19, and at the moment, the annular oil cavity 23 is communicated with the high-pressure oil channel again, so that the high-pressure oil channel is communicated with the low-pressure oil channel 21 again; after passing through the high-pressure oil duct of the pump body 4, the second radial hole of the valve sleeve 17, the annular groove of the control valve 18, the gap between the second annular inclined surface and the first annular inclined surface, the annular oil chamber 23 and the low-pressure oil duct 21 of the pump body 4 in sequence, the high-pressure fuel in the plunger cavity of the pump body 4 quickly flows back into the oil tank, and the unloading process is completed; when the control valve 18 falls onto the bottom limiting block 19, the fuel in the inner hole of the control valve 18 flows into the annular oil passage through the strip-shaped slot 22 of the bottom limiting block 19, referring to the arrow flow direction in fig. 9, and the phenomenon that the pressure in the inner hole of the control valve 18 is too high to generate an oil cushion effect is avoided.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. An electrically controlled monoblock pump comprising: the device comprises a plunger (3), a pump body (4), a pump nozzle (5), a damping valve assembly, a coil (9), an armature (12), an electromagnet pressing block (10) and a control valve assembly; it is characterized by also comprising: a valve sleeve (17), a bottom limiting block (19) and a compression nut (20);
a plunger cavity is processed at one end of the pump body (4), a pump nozzle mounting hole coaxial with the plunger cavity is processed at the other end of the pump body (4), the pump nozzle mounting hole is communicated with the plunger cavity through a first axial hole, a cylindrical boss extends out of the end of the pump nozzle mounting hole of the pump body (4), the axis of the cylindrical boss is parallel to the axis of the pump nozzle mounting hole, and the inner hole of the cylindrical boss is communicated with the first axial hole through a first radial hole; the first radial hole and the first axial hole which are communicated form a high-pressure oil duct; a low-pressure oil duct (21) is processed in the pump body (4), one end of the low-pressure oil duct (21) is communicated with an external oil path, the other end of the low-pressure oil duct is communicated with an inner hole of the cylindrical boss, and the low-pressure oil duct (21) is not communicated with the plunger cavity;
the plunger (3) is coaxially arranged in a plunger cavity of the pump body (4), and the plunger (3) can linearly reciprocate in the plunger cavity along the axial direction of the plunger cavity;
the bottom of the pump nozzle (5) is arranged in a pump nozzle mounting hole of the pump body (4), the top of the pump nozzle (5) is connected with the oil sprayer through a high-pressure oil pipe, a second axial hole is formed in the bottom of the pump nozzle (5), and a damping mounting hole communicated with the second axial hole is formed in the top of the pump nozzle (5); the second axial hole is butted and communicated with the first axial hole of the pump body (4);
the damping valve assembly is arranged in a damping mounting hole of the pump nozzle (5) and is used for preventing pressure waves from enabling the fuel injector to start spraying for the second time;
the compression nut (20) is fixed at the bottom of an inner hole of a cylindrical boss of the pump body (4), and the bottom limiting block (19) is supported at the top of the compression nut (20); the bottom limiting block (19) is a three-section stepped cylinder, and the lower end face of the section with the largest diameter is supported on a compression nut (20); an annular oil passage is formed between the outer circumferential surface of the section with the minimum diameter of the bottom limiting block (19) and the inner circumferential surface of the inner hole of the cylindrical boss of the pump body (4), and the annular oil passage is communicated with a low-pressure oil passage (21) in the pump body (4);
the valve sleeve (17) is arranged in an inner hole of a cylindrical boss of the pump body (4) in an interference fit mode through a hole shaft and is positioned above the bottom limiting block (19), a set distance is reserved between the valve sleeve and the upper end face of the section with the minimum diameter of the bottom limiting block (19), and a first annular inclined plane is machined on the inner circumferential surface of the bottom of the valve sleeve (17); a second radial hole is processed on the valve sleeve (17), and the second radial hole is communicated with the first radial hole of the pump body (4) in a butt joint mode, namely communicated with a high-pressure oil duct of the pump body (4);
the control valve assembly is arranged in a valve sleeve (17), and an armature (12) is arranged at the top of the control valve assembly; the coil (9) is tightly pressed and installed at the top of a cylindrical boss of the pump body (4) through an electromagnet pressing block (10), and the lower surface of the coil (9) is opposite to the upper surface of the armature (12); an annular groove is formed in the outer circumferential surface of the control valve assembly and communicated with a second radial hole of the valve sleeve (17), a second annular inclined surface matched with the first annular inclined surface is formed in the lower side surface of the annular groove, and the outer diameter of the end, where the second annular inclined surface of the control valve assembly is located, is larger than the inner diameter of the valve sleeve (17); when the coil (9) is not electrified, the bottom of the control valve assembly is supported on the upper end face of the section with the minimum diameter of the bottom limiting block (19), a gap is reserved between the second annular inclined surface of the control valve (18) and the first annular inclined surface, and the annular oil cavity (23) is communicated with the high-pressure oil passage of the pump body (4) sequentially through the gap between the second annular inclined surface and the first annular inclined surface, the annular groove of the control valve (18) and the second radial hole of the valve sleeve (17); when the coil (9) is electrified, the control valve (18) moves upwards until the second annular inclined surface is contacted with the first annular inclined surface, and the annular oil cavity (23) is not communicated with the high-pressure oil passage.
2. An electrically controlled monoblock pump according to claim 1, characterized in that the center of the upper end face of the section with the smallest diameter of the bottom stopper (19) is provided with a strip-shaped slot (22); the control valve assembly is of a hollow structure, and an inner hole of the control valve assembly is communicated with the annular oil duct through a strip-shaped groove (22) of a bottom limiting block (19).
3. An electrically controlled monoblock pump according to claim 1, characterized in that the step surface between the largest diameter section and the second largest diameter section of the bottom stopper (19) is fitted with an annular boss machined in the inner bore of the cylindrical boss of the pump body (4).
4. An electrically controlled unit pump according to claim 1, wherein the pump nozzle mounting hole of the pump body (4) is a threaded hole, and the pump nozzle (5) is threadedly mounted in the pump nozzle mounting hole of the pump body (4).
5. An electrically controlled unit pump according to claim 1, wherein the pump nozzle mounting hole of the pump body (4) is a smooth hole, and the pump nozzle (5) is mounted in the pump nozzle mounting hole of the pump body (4) by interference fit.
6. An electrically controlled monoblock pump according to claim 1, wherein said control valve assembly comprises: a height adjusting block (13), an upper limit block (14), a control valve spring (15), a lower limit block (16) and a control valve (18);
the control valve (18) is sleeved in the valve sleeve (17); the control valve (18) is of a hollow structure, an annular groove is formed in the outer circumferential surface of the control valve, the annular groove is communicated with a second radial hole of the valve sleeve (17), a second annular inclined surface matched with the first annular inclined surface is formed in the lower side surface of the annular groove, and the outer diameter of the end, where the second annular inclined surface is located, of the control valve (18) is larger than the inner diameter of the valve sleeve (17); when the control valve (18) is supported on the upper end face of the section with the minimum diameter of the bottom limiting block (19), a gap is reserved between a second annular inclined face of the control valve (18) and the first annular inclined face, and the annular oil cavity (23) is communicated with the high-pressure oil passage of the pump body (4) sequentially through the gap between the second annular inclined face and the first annular inclined face, the annular groove of the control valve (18) and the second radial hole of the valve sleeve (17); when the control valve (18) moves upwards until the second annular inclined surface is in contact with the first annular inclined surface, the annular oil cavity (23) is not communicated with the high-pressure oil passage; the top of the control valve (18) extends out of the valve sleeve (17) and is fixedly connected with the armature (12);
the height adjusting block (13) is of an annular structure and is sleeved on a step surface of the inner circumferential surface of an inner hole of the cylindrical boss of the pump body (4);
the upper limiting block (14) and the lower limiting block (16) are respectively sleeved on the upper end and the lower end of the control valve (18) extending out of the valve sleeve (17), wherein the lower limiting block (16) is supported on a step surface processed on the outer circumferential surface of the control valve (18);
the control valve spring (15) is arranged on the control valve (18) and extends out of the valve sleeve (17), and two ends of the control valve spring (15) are respectively abutted against the upper limiting block (14) and the lower limiting block (16).
7. An electrically controlled monoblock pump according to claim 1, wherein said damper valve assembly comprises: the damping valve core (6), the damping spring (7) and the damping pressure block (8);
the damping valve core (6) is installed on the inner bottom surface of a damping installation hole of the pump nozzle (5), the damping pressing block (8) is installed at the upper part in the damping installation hole of the pump nozzle (5) in an interference fit mode, the damping spring (7) is installed between the damping valve core (6) and the damping pressing block (8) and is in a compression state, and two ends of the damping spring are respectively contacted with the damping valve core (6) and the damping pressing block (8); and a through hole communicated with the second axial hole is processed in the damping valve core (6), and a nozzle is arranged on the damping pressing block (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010510309.0A CN111720246A (en) | 2020-06-08 | 2020-06-08 | Electric control unit pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010510309.0A CN111720246A (en) | 2020-06-08 | 2020-06-08 | Electric control unit pump |
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| CN111720246A true CN111720246A (en) | 2020-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010510309.0A Pending CN111720246A (en) | 2020-06-08 | 2020-06-08 | Electric control unit pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115467767A (en) * | 2022-08-15 | 2022-12-13 | 北京理工大学 | Device for weakening pressure interference between pumps |
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| US4653455A (en) * | 1984-09-14 | 1987-03-31 | Robert Bosch Gmbh | Electrically controlled fuel injection pump for internal combustion engines |
| CN201582022U (en) * | 2009-12-01 | 2010-09-15 | 深圳市元征软件开发有限公司 | Engine and control valve of electrical control monoblock pump thereof |
| CN201723344U (en) * | 2010-04-01 | 2011-01-26 | 北京理工大学 | Electric control monoblock pump with nonorthogonal heteroaxial control valve axis and pump axis |
| CN111102113A (en) * | 2019-12-31 | 2020-05-05 | 南岳电控（衡阳）工业技术股份有限公司 | Automatically controlled monoblock pump control structure |
| CN212583861U (en) * | 2020-06-08 | 2021-02-23 | 北京理工大学 | Electric control unit pump |
-
2020
- 2020-06-08 CN CN202010510309.0A patent/CN111720246A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4653455A (en) * | 1984-09-14 | 1987-03-31 | Robert Bosch Gmbh | Electrically controlled fuel injection pump for internal combustion engines |
| CN201582022U (en) * | 2009-12-01 | 2010-09-15 | 深圳市元征软件开发有限公司 | Engine and control valve of electrical control monoblock pump thereof |
| CN201723344U (en) * | 2010-04-01 | 2011-01-26 | 北京理工大学 | Electric control monoblock pump with nonorthogonal heteroaxial control valve axis and pump axis |
| CN111102113A (en) * | 2019-12-31 | 2020-05-05 | 南岳电控（衡阳）工业技术股份有限公司 | Automatically controlled monoblock pump control structure |
| CN212583861U (en) * | 2020-06-08 | 2021-02-23 | 北京理工大学 | Electric control unit pump |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115467767A (en) * | 2022-08-15 | 2022-12-13 | 北京理工大学 | Device for weakening pressure interference between pumps |
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