CN117432563A - Hydraulic balance pilot valve and electric control fuel injector - Google Patents
Hydraulic balance pilot valve and electric control fuel injector Download PDFInfo
- Publication number
- CN117432563A CN117432563A CN202311549029.0A CN202311549029A CN117432563A CN 117432563 A CN117432563 A CN 117432563A CN 202311549029 A CN202311549029 A CN 202311549029A CN 117432563 A CN117432563 A CN 117432563A
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- sleeve
- armature
- section
- pilot valve
- guide body
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- 239000000446 fuel Substances 0.000 title claims abstract description 38
- 238000007667 floating Methods 0.000 claims abstract description 45
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910052742 iron Inorganic materials 0.000 claims abstract description 6
- 230000013011 mating Effects 0.000 claims description 8
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims 1
- 238000004382 potting Methods 0.000 claims 1
- 238000007789 sealing Methods 0.000 description 22
- 238000002347 injection Methods 0.000 description 13
- 239000007924 injection Substances 0.000 description 13
- 238000000034 method Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000565 sealant Substances 0.000 description 3
- 238000003825 pressing Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003466 welding Methods 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
-
- 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
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
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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
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
- F02M51/0614—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of electromagnets or fixed armature
-
- 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
-
- 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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/0014—Valves characterised by the valve actuating means
- F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
- F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The application provides a hydraulic balance pilot valve and an electric control fuel injector. Wherein, the hydraulic balanced pilot valve includes: a guide body; the electromagnetic valve assembly can be arranged in an electromagnetic valve cavity formed by the oil sprayer body and the guide body; the armature iron passes through the guide matching hole of the guide body, the armature iron comprises an armature plate and an armature rod, the armature plate is positioned in an electromagnetic valve cavity formed by the oil sprayer body and the guide body, and the lower end of the armature rod is positioned in a high-pressure cavity formed by the guide body and the metering orifice plate; the armature pin comprises a first section and a second section, the radial dimension of the first section is larger than that of the second section, a first conical surface is arranged between the first section and the second section, and the first section is in clearance fit with a guide hole of the guide body; a floating sleeve, the hollow hole of which is in clearance fit with the second section; the upper end of the hollow hole is provided with a flared second conical surface.
Description
Technical Field
The invention relates to a hydraulic balance pilot valve and an electric control fuel injector.
Background
The high-pressure common rail electric control fuel injector is a key component for realizing full-flexible injection of a diesel engine, wherein a pilot valve is one of important components of the fuel injector, the fuel injection and the fuel cut-off of the fuel injector are controlled by opening and closing the pilot valve, and the movement performance of the pilot valve plays a key role in controlling the fuel injection pressure and the fuel injection quantity of the fuel injector.
Along with the improvement of the injection pressure of the electric control fuel injector, the sealing pressure of the pilot valve is higher and higher, the electromagnetic force requirement for opening the pilot valve is also higher and higher, and the size space of the electromagnetic valve is limited due to the compact arrangement requirement of the fuel injector. Therefore, the ball valve pilot valve is difficult to meet the requirement of further improving the injection pressure of the electric control fuel injector and miniaturizing the electric control fuel injector at present.
The hydraulic balance type pilot valve is generally adopted at present, the existing structure is as shown in fig. 1, clearance fit and conical surface sealing are required to be realized between the valve rod and the guide body 200 of the existing hydraulic balance type pilot valve, the requirements on the coaxiality and the position degree of the guide hole and the sealing conical surface of the guide body are high, and the process difficulty is high. In addition, in addition to this, pilot return oil flows through the armature chamber 300 of the solenoid valve, and flow instability affects the movement of the armature 400, and thus the injection stability of the electronically controlled fuel injector.
Disclosure of Invention
The invention aims to provide a hydraulic balance type pilot valve.
It is another object of the present invention to provide a fuel injector.
A hydraulically balanced pilot valve according to the first aspect of the present application, comprising: a guide body; the electromagnetic valve assembly can be arranged in an electromagnetic valve cavity formed by the oil sprayer body and the guide body; the armature iron passes through the guide matching hole of the guide body, the armature iron comprises an armature plate and an armature rod, the armature plate is positioned in an electromagnetic valve cavity formed by the oil sprayer body and the guide body, and the lower end of the armature rod is positioned in a high-pressure cavity formed by the guide body and the metering orifice plate; the armature pin comprises a first section and a second section, the radial dimension of the first section is larger than that of the second section, a first conical surface is arranged between the first section and the second section, and the first section is in clearance fit with a guide hole of the guide body; the floating sleeve can be arranged in a high-pressure cavity formed by the guide body and the metering orifice plate; the hole of the floating sleeve is in clearance fit with the second section; the upper end of the hole of the floating sleeve is provided with a flared second conical surface, and the first conical surface of the armature pin is matched with the second conical surface of the floating sleeve to form a valve port of the hydraulic balance pilot valve.
According to the technical scheme, the pilot valve with the floating sleeve is arranged, the armature sealing conical surface is located below the armature rod, the sealing conical surface is matched and sealed with the seat surface of the floating sleeve, the first section of the armature rod is used as the guide section, the outer circle of the first section of the armature rod is in tight clearance fit with the guide hole of the guide body, the head of the armature rod is in clearance fit with the hole of the floating sleeve, the lower surface of the floating sleeve is in flat sealing fit with the measuring hole plate, and the floating sleeve can realize self-centering under the armature guide in the armature seating process, so that the sealing reliability of the conical surface is ensured. The sealing seat surface and the tight clearance fit guiding holes are distributed in different parts, namely, the guiding fit holes of the armature pin and the conical surface sealing seat surface are respectively positioned on the guiding body and the floating sleeve, so that the processing technology difficulty is reduced.
In one or more embodiments of the pilot valve, a radial mating surface of the injector body and solenoid valve assembly defines a first flow channel and a top mating surface defines a second flow channel.
In one or more embodiments of the pilot valve, a second oil return channel formed in the oil sprayer body is communicated with the top of the electromagnetic valve cavity, and a first oil return channel formed in the orifice measuring plate is communicated with the bottom of the floating sleeve.
In one or more embodiments of the pilot valve, the electromagnetic valve assembly includes an electromagnet assembly, the electromagnet assembly includes an iron core, a first sleeve body, and a second sleeve body, the top of the iron core is fixedly connected with the first sleeve body, the second sleeve body is sleeved in a hollow hole of the iron core, the first sleeve body and the second sleeve body are connected, a containing channel provided by the first sleeve body and the second sleeve body contains a first elastic piece, and the other end of the containing channel can be closed by the armature plate; the first sleeve body and the second sleeve are welded with the iron core.
In one or more embodiments of the pilot valve, the solenoid valve assembly further includes a second elastic member disposed between the first sleeve and a wall of the solenoid valve chamber.
In one or more embodiments of the pilot valve, the first sleeve body has a base portion and a boss portion protruding from the base portion, and the second elastic member is sleeved on the boss portion and supported by the base portion.
In one or more embodiments of the pilot valve, a coil is arranged inside the iron core, a coil wire is welded, and the coil and the wire are located on the side portion of the iron core for plastic packaging.
In one or more embodiments of the pilot valve, a circulation groove is formed in the lower portion of the iron core, and pouring sealant is filled in the circulation groove.
An electrically controlled fuel injector according to the second aspect of the present application comprises a hydraulically balanced pilot valve as described in the first aspect.
Drawings
The above and other features, properties and advantages of the present invention will become more apparent from the following description of the accompanying drawings and embodiments in which like reference numerals refer to like features throughout, it being noted that these drawings are given by way of example only, which are not drawn to scale and should not be construed to limit the true scope of the invention, wherein:
FIG. 1 is a schematic diagram of a prior art hydraulic balanced pilot valve.
FIG. 2 is a schematic diagram of a hydraulic balanced pilot valve according to an embodiment;
FIG. 3 is a schematic structural diagram of a solenoid valve assembly of a hydraulic balanced pilot valve according to an embodiment.
FIG. 4 is a schematic diagram of an electromagnet assembly of a hydraulic balanced pilot valve according to one embodiment.
FIG. 5 is a schematic diagram of a mating structure of an armature and a floating sleeve of a hydraulic balanced pilot valve according to an embodiment.
Detailed Description
Reference will now be made in detail to the various embodiments of the invention, examples of which are illustrated in the accompanying drawings and described below. While the invention will be described in conjunction with the exemplary embodiments, it will be appreciated that the present description is not intended to limit the invention to those exemplary embodiments. On the contrary, the invention is intended to cover not only these exemplary embodiments, but also various alternatives, modifications, equivalents and other embodiments, which may be included within the spirit and scope of the invention as defined by the appended claims.
In the following description, references to orientations or positional relationships of "inner", "outer", "upper", "lower", "top", "bottom", or other orientation terminology are based on the orientation or positional relationships shown in the drawings, and are merely for convenience in describing the invention and to simplify the description, rather than to indicate or imply that the device or component referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the invention.
Meanwhile, the present application uses specific words to describe embodiments of the present application. As "some embodiments" means a particular feature, structure, or characteristic described in connection with at least one embodiment of the present application. Thus, it should be emphasized and should be appreciated that two or more references to "some embodiments" in this specification at different positions are not necessarily referring to the same embodiment. Furthermore, certain features, structures, or characteristics of some embodiments of the present application may be combined as suitable.
At present, along with the lifting of the injection pressure of an electric control fuel injector, the sealing pressure of a pilot valve is higher and higher, the electromagnetic force requirement for opening the pilot valve is also higher and higher, and the size space of an electromagnetic valve is limited due to the compact arrangement requirement of the fuel injector.
Through intensive studies, the inventor of the present application found that, as in the prior hydraulic balance pilot valve shown in fig. 1, clearance fit and conical surface sealing are required between the valve rod and the guide body 200, and the requirements on coaxiality and position degree of the guide hole and the sealing conical surface of the guide body are high, so that the process difficulty is high. Additionally, in addition to the pilot return oil flowing through the armature chamber 300 of the solenoid valve, the flow instability affects the movement of the armature 400 and thus affects the injection stability of the electronically controlled injector
Based on the above considerations, the inventor has conducted intensive studies and has designed a hydraulic balanced pilot valve and an electric control fuel injector, through setting up the pilot valve with floating sleeve, armature sealing conical surface is located and is engaged with the floating sleeve seat surface and seals, the first section of armature rod is regarded as its excircle of guide section and the tight clearance fit of guiding hole of the guide body, the hole clearance fit of the head of armature rod and floating sleeve, floating sleeve lower surface and measuring orifice plate plane seal fit, armature sitting in-process, the floating sleeve can realize being looked for by oneself under armature guide, guarantee that conical surface seal is reliable. The sealing seat surface and the tight clearance fit guiding holes are distributed in different parts, namely, the guiding fit holes of the armature pin and the conical surface sealing seat surface are respectively positioned on the guiding body and the floating sleeve, so that the processing technology difficulty is reduced.
Although the fuel injector disclosed in the embodiments of the present application is applicable to a high-pressure common rail electrically controlled fuel injector of a marine diesel engine, the fuel injector is not limited to this, and may be applicable to other applications, such as heavy vehicles and railway trains, and may also be applicable to other internal combustion engines, such as mixed fuel engines, for example, methanol-diesel engines, etc., as long as the fuel injector of the engine can be applied to the hydraulic balanced pilot valve disclosed in the present application.
Referring to fig. 2-5, in one embodiment, a hydraulically balanced pilot valve includes: the electromagnetic valve comprises a guide body 1, a floating sleeve 2, an electromagnetic valve assembly 3 and an armature 4. The armature comprises an armature plate 41 and an armature rod 42, and the armature plate 41 and the armature rod 42 can be welded into a whole by split pieces or can be integrated. The solenoid valve assembly 3 is mounted in a solenoid valve chamber 6 formed by the injector body 5 and the guide body 1.
Referring to fig. 2 and 5, the floating collar 2 is mounted in a high pressure chamber 8 formed by the pilot body 1 and orifice plate 7, the armature passes through a pilot mating bore of the pilot body 1, the armature plate 41 is located in an electromagnetic valve chamber 6 formed by the injector body 5 and pilot body 1, and the armature pin 42 includes a first segment 421 and a second segment 422. The radial dimension of the first section 421 is greater than that of the second section 422, and the lower end of the second section 422 is located in the high-pressure chamber 8 formed by the guide body 1 and the orifice plate 7. The large outer circle provided by the first segment 421 of the armature pin 42 and the guide bore of the guide body 1 form a fit gap 9, and the second segment 422 of the armature pin 42 and the central bore of the floating sleeve 2 form a fit gap 10. The first conical surface 423 is arranged between the first section 421 and the second section 422, the upper end of the middle hole of the floating sleeve 2 is provided with the second conical surface 201 with a flaring, the lower plane of the floating sleeve 2 is contacted with the upper plane of the measuring orifice plate 7, and the second conical surface 201 of the floating sleeve 2 and the first conical surface 423 of the armature pin 4 form the valve port 11.
When the electromagnetic valve is not electrified, the armature rod 42 is in contact with the floating sleeve 2 under the action of the spring 12, the valve port 11 is in a closed state, the upper surface of the floating sleeve 2 bears the high-pressure fuel pressure in the high-pressure cavity 8 and is pressed on the orifice plate 7, at the moment, the high-pressure fuel in the high-pressure cavity 8 only acts on the circumference of the armature rod 42, the high-pressure fuel pressure borne by the armature rod 42 is balanced, and the armature is opened only by overcoming the pretightening force of the spring 12, so that the electromagnetic force required by opening the balanced valve is irrelevant to the working pressure of the oil sprayer, and the working pressure of the oil sprayer is improved.
When the solenoid valve is de-energized, the armature moves downward under the action of the spring 12 until the first conical surface 423 of the armature rod 42 engages the first conical surface 423 of the float sleeve 2, closing the valve port 11. In the process of pressing the floating sleeve 2 by the armature seat, the floating sleeve 2 can realize micro-motion self-centering under the small outer circle guiding action of the head part of the armature rod 42 until the valve port 11 is completely closed, thereby being beneficial to improving the sealing reliability. Meanwhile, the guiding function of the armature pin 42 in the moving process is ensured by the guiding middle hole of the guiding body 1, so that the guiding fit and the conical surface sealing fit of the armature pin are respectively distributed on the guiding body 1 and the floating sleeve 2, and the processing and manufacturing difficulty of parts is reduced.
Preferably, with continued reference to fig. 2 and 5, in some embodiments, the lower small cylinder of the second segment 422 of the armature pin 42 is provided with a flat 30, the flat 30 and the central bore of the floating sleeve 2 forming the passageway 31. The beneficial effects of this are that when the solenoid valve is circular telegram, armature is closed by the solenoid valve, opens valve port 11, and the high pressure fuel in the high pressure chamber 8 passes through valve port 11, and the passageway 31 flows into first oil return duct 13, and the fuel pressure in the high pressure chamber 8 reduces, and the hydraulic pressure that acts on floating cover 2 reduces, but floating cover 2 still can keep pressing on measuring orifice plate 7, so makes, and guide's oil return oil circuit and armature clearance oil return oil circuit separate, and guide's oil return flows from first oil return duct, does not pass through the armature chamber, is favorable to improving armature motion stability to improve injection stability.
With continued reference to fig. 2, in some embodiments, the return oil path of the pilot valve may further include a first flow channel 32 formed on a radial mating surface of the injector body 5 and the solenoid valve assembly 3, and a second flow channel 29 formed on a top mating surface. The top of the electromagnetic valve cavity 6 is communicated with a second oil return channel 19 formed in the oil sprayer body, and the bottom of the floating sleeve 2 is communicated with a first oil return channel 13 formed in the orifice plate 7. When the electromagnetic valve is not electrified, the high-pressure cavity 8 is filled with high-pressure oil, the high-pressure oil in the high-pressure cavity 8 leaks into the electromagnetic valve cavity 6 through the fit clearance 9 and flows into the third flow groove 28 on the iron core, the first flow groove 32 and the second flow groove 29 on the oil sprayer body to fill the electromagnetic valve cavity 6, the top of the electromagnetic valve cavity 6 is communicated with the second oil return oil duct 19, and the clearance leakage flows out of the oil sprayer from an oil return port of the second oil return channel. When the electromagnetic valve is electrified, the valve port 11 is opened, fuel in the high-pressure cavity 8 flows into the first oil return channel 13 through the valve port 11, and flows out of the fuel injector from the first oil return channel 13. And, the clearance leakage oil return oil flows through the second circulation groove 29, the circulation area of the second circulation groove 29 is smaller and is equivalent to an orifice, so that the pressure fluctuation in the electromagnetic valve cavity 6 can be stabilized, the movement stability of the pilot valve is improved, and the injection stability is improved.
Referring to fig. 3 and 4, in some embodiments, the specific structure of the electromagnetic valve assembly 3 may include an electromagnet assembly 14, where the electromagnet assembly 14 includes a core 20, a first sleeve 21 (such as a T-shaped sleeve as shown in the drawings), and a second sleeve 22, where the top of the core 20 is fixedly connected to the first sleeve 21, the second sleeve 22 is sleeved in a hollow hole of the core 20, and the first sleeve 21, the second sleeve 22 and the core 20 are welded. The first and second casings 21, 22 provide a receiving passage for receiving the first elastic member 12 and providing the spring seat 15, and the other end of the receiving passage can be closed by the armature plate 41. The spring seat 15 contacts with the top surface of the inner hole of the first sleeve body 21, one end of the first elastic piece 12 contacts with one end of the spring seat 15 and presses the upper surface of the armature, when the electromagnetic valve is not electrified, an initial gap is reserved between the upper surface of the armature disc 41 and the lower end surface of the iron core 20, and when the electromagnetic valve is electrified, the armature is attracted, and the upper surface of the armature contacts with the lower end surface of the second sleeve body 22. The first sleeve body 21, the second sleeve body 22 and the iron core 20 are welded into a whole to be used as a stress supporting structure. Compared with the traditional fuel injector electromagnet, the electromagnet has simpler and more compact structure under the condition of unchanged functions, and is convenient to process and manufacture.
With continued reference to fig. 3, in some embodiments, the solenoid valve assembly 3 may further include a second resilient member 16, the second resilient member 16 being disposed between the first sleeve 21 and a wall of the solenoid valve chamber 6. Preferably, the first sleeve 21 has a base 211 and a boss 212 protruding from the base, and the second elastic member 16 is sleeved on the boss 212 and supported by the base 211. The electromagnetic valve assembly 3 may further include a gasket 17, the second elastic member 16 and the gasket 17 are sleeved on the electromagnet boss 212, the gasket 17 contacts with the step surface of the oil sprayer body 5, the lower end surface of the iron core 20 contacts with the adjusting gasket 18, and the adjusting gasket 18 presses on the upper end surface of the guide body 1. The structure of the arrangement is simple.
With continued reference to fig. 4, in some embodiments, a bobbin 24 is mounted within the core 20, the bobbin 24 is wound with a coil 23, the coil 23 is soldered to a wire 27, and then the coil 23 and the wire 27 are molded on the sides of the core 20 to ensure insulation. The lower part of the iron core 20 is provided with a plurality of, for example, 4 third flow grooves 28 which are uniformly and symmetrically arranged, the third flow grooves 28 are filled with pouring sealant with a certain depth, the 4 grooves can reduce vortex and circulate a part of fluid, and the pouring sealant in the grooves can effectively improve the stability of the coil and the framework.
In summary, the beneficial effects of the hydraulic balanced pilot valve and the fuel injector described above include one or a combination of the following:
1. when the electromagnetic valve is not electrified, the hydraulic force born by the armature is balanced up and down, the electromagnetic force required by opening the electromagnetic valve is irrelevant to rail pressure, the requirement on the electromagnetic force is reduced, and the rail pressure is improved and the fuel injector is compactly arranged;
2. the pilot valve with the floating sleeve is characterized in that an armature sealing conical surface is positioned below an armature rod, the sealing conical surface is matched and sealed with a seat surface of the floating sleeve, the outer circle of a guide section of the armature rod is in tight clearance fit with a middle hole of a guide body, the head of the armature rod is in clearance fit with Kong Song in the floating sleeve, the lower surface of the floating sleeve is matched with a plane of a measuring hole plate in a sealing manner, and the floating sleeve can realize self-alignment under the guide of the armature in the process of seating the armature, so that the sealing reliability of the conical surface is ensured. The sealing seat surface and the tight clearance fit guide holes are distributed on different parts, so that the processing technology difficulty is greatly reduced;
3. compared with the traditional electromagnetic valve, the electromagnet cancels a complex packaging structure, and only retains an iron core, a coil, a framework, an insulator, a switching piece, a wire and the like. The positioning sleeve, the T-shaped sleeve, the iron core and the welding are integrated to be used as a stress supporting structure. Compared with the electromagnet of the traditional oil sprayer, the electromagnet has simpler and more compact structure under the condition of unchanged functions, and is convenient to process and manufacture;
4. the pilot oil return oil way is separated from the armature clearance oil return oil way, and pilot oil does not pass through the armature cavity, so that the movement stability of the armature is improved, and the injection stability is improved;
5. an oil return flow groove or an orifice is arranged in a gap oil return oil way flowing through the electromagnetic valve cavity, so that pressure fluctuation of the armature cavity can be stabilized, and the movement stability of the pilot valve is improved, thereby improving the injection stability.
While the invention has been described in terms of preferred embodiments, it is not intended to be limiting, but rather to the invention, and that variations and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, any modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention fall within the protection scope defined by the claims of the present invention.
Claims (10)
1. A hydraulically balanced pilot valve, comprising:
a guide body;
the electromagnetic valve assembly can be arranged in an electromagnetic valve cavity formed by the oil sprayer body and the guide body;
the armature iron passes through the guide matching hole of the guide body, the armature iron comprises an armature plate and an armature rod, the armature plate is positioned in an electromagnetic valve cavity formed by the oil sprayer body and the guide body, and the lower end of the armature rod is positioned in a high-pressure cavity formed by the guide body and the metering orifice plate; the armature pin comprises a first section and a second section, the radial dimension of the first section is larger than that of the second section, a first conical surface is arranged between the first section and the second section, and the first section is in clearance fit with a guide hole of the guide body;
the floating sleeve can be arranged in a high-pressure cavity formed by the guide body and the metering orifice plate; the hole of the floating sleeve is in clearance fit with the second section; the upper end of the hole of the floating sleeve is provided with a flared second conical surface, and the first conical surface of the armature pin is matched with the second conical surface of the floating sleeve to form a valve port of the hydraulic balance pilot valve.
2. The hydraulic balanced pilot valve as recited in claim 1 wherein the second section has flats that form channels with the bore of the floating sleeve.
3. The balanced pilot valve of claim 1, wherein the radial mating surfaces of the injector body and solenoid valve assembly define a first flow channel and the top mating surface defines a second flow channel.
4. The hydraulic balanced pilot valve as recited in claim 1 wherein a second oil return passage is provided in the injector body in communication with a top of the electromagnetic valve chamber and a first oil return passage is provided in the orifice plate in communication with a bottom of the floating sleeve.
5. The hydraulic balanced pilot valve as recited in claim 1 wherein the solenoid valve assembly includes an electromagnet assembly, the electromagnet assembly includes an iron core, a first sleeve, a second sleeve, the top of the iron core is fixedly connected with the first sleeve, the second sleeve is sleeved in a hollow hole of the iron core, the first sleeve and the second sleeve are connected, a receiving channel is provided by the first sleeve and the second sleeve, a first elastic member is received, and the other end of the receiving channel can be contacted by the armature plate; the first sleeve body and the second sleeve body are welded with the iron core.
6. The hydraulic balanced pilot valve as recited in claim 5 wherein the solenoid valve assembly further comprises a second resilient member disposed between the first sleeve and a wall of the solenoid valve chamber.
7. The hydraulic balanced pilot valve as recited in claim 6 wherein the first sleeve has a base and a boss projecting from the base, the second resilient member being sleeved on the boss and supported by the base.
8. The hydraulic balanced pilot valve as recited in claim 5 wherein a coil is disposed inside the core, the coil is welded to a wire, and the coil and wire are in plastic packaging at the side of the core.
9. The hydraulic balanced pilot valve as recited in claim 5 wherein a flow channel is provided in a lower portion of the core, the flow channel being filled with a potting compound.
10. An electronically controlled fuel injector comprising a hydraulically balanced pilot valve as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311549029.0A CN117432563A (en) | 2023-11-20 | 2023-11-20 | Hydraulic balance pilot valve and electric control fuel injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311549029.0A CN117432563A (en) | 2023-11-20 | 2023-11-20 | Hydraulic balance pilot valve and electric control fuel injector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117432563A true CN117432563A (en) | 2024-01-23 |
Family
ID=89558280
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311549029.0A Pending CN117432563A (en) | 2023-11-20 | 2023-11-20 | Hydraulic balance pilot valve and electric control fuel injector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117432563A (en) |
-
2023
- 2023-11-20 CN CN202311549029.0A patent/CN117432563A/en active Pending
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