CN211777779U - Fuel injector for realizing diesel/natural gas dual-fuel injection - Google Patents
Fuel injector for realizing diesel/natural gas dual-fuel injection Download PDFInfo
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- CN211777779U CN211777779U CN201922184956.2U CN201922184956U CN211777779U CN 211777779 U CN211777779 U CN 211777779U CN 201922184956 U CN201922184956 U CN 201922184956U CN 211777779 U CN211777779 U CN 211777779U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Abstract
The utility model discloses a fuel injector for realizing diesel/natural gas dual fuel injection, wherein a hydraulic piston and a transition rod are arranged in an injector body; a needle valve coupling part, an injector tight cap and a large needle valve are arranged below the injector body; a large needle valve limiting nut, a small needle valve spring, a small needle valve limiting adjusting bolt and a small needle valve are arranged in the large needle valve; the injector body is connected with a balance valve tightening cap and an iron core tightening cap, and an iron core, an iron core lower body and an armature are arranged in the iron core tightening cap; a balance valve seat, a transition block and a measuring hole block are arranged in the balance valve tightening cap; the side wall of the injector body is provided with an oil return interface, an oil inlet interface and an air inlet interface, the oil return interface is communicated with the lower low-pressure oil cavity through a first oil return passage and an upper low-pressure oil cavity downwards and is communicated with a metering orifice block oil return passage through a second oil return passage upwards, the oil inlet interface is communicated with the oil inlet metering orifice through a second high-pressure oil passage upwards and is communicated with the diesel oil spray orifice through a first high-pressure oil passage, a large needle valve oil inlet and a high-pressure oil cavity downwards, and the air inlet interface is communicated with the natural gas spray orifice through a high.
Description
Technical Field
The utility model relates to an sprayer technical field, more specifically say so, relate to a realize diesel oil/natural gas dual fuel injection's fuel injector.
Background
With the continuous decrease of petroleum resources and the increase of environmental pollution, natural gas is receiving more and more attention as an alternative fuel due to its huge reserves and friendly emission. The thermal efficiency of the diesel oil and natural gas dual-fuel engine can be equivalent to that of a diesel engine, so that the fuel cost is lower, and the pollutant emission can be effectively reduced. It is of great practical interest to develop a fuel injector that achieves dual diesel/natural gas injection.
The diesel oil and natural gas dual-fuel engine can be mainly divided into an air inlet channel injection dual-fuel engine and an in-cylinder direct injection dual-fuel engine according to a natural gas supply mode. The natural gas nozzle of the air inlet channel injection dual-fuel engine is arranged at the air inlet channel, natural gas and air are fully mixed to form homogeneous mixed gas, then diesel oil is injected into the combustion chamber at the later stage of a compression stroke, and the natural gas-air mixed gas can be ignited by a small amount of pilot diesel oil. The combustion mode of uniform premixing is influenced by knocking, the average effective pressure is reduced compared with the average effective pressure of the original diesel engine, and the heat efficiency of the engine is reduced. On the other hand, due to the adoption of the air inlet channel injection mode, the charge coefficient of the engine is reduced, and the power of the engine is reduced. In the diesel ignition cylinder internal direct injection natural gas engine, natural gas and diesel oil are injected in a cylinder internal direct injection mode, proper pilot diesel oil is firstly injected in the later stage of a compression stroke, the pilot diesel oil is firstly self-ignited to form a fire core, then high-pressure natural gas is injected, the natural gas is ignited by the flame of the pilot diesel oil, and the high-pressure natural gas is diffused and combusted in the fire core formed by the pilot diesel oil. The combustion technology can provide better fuel economy and combustion efficiency, and the engine can realize the balance of dynamic property and emission property. Therefore, such engines are also receiving more attention.
The oil injector of the traditional high-pressure common rail system can only inject one fuel, if the oil injector is applied to a direct injection natural gas engine in a diesel pilot cylinder, two fuel injection systems are needed, and two injectors are needed to be installed in each cylinder. Such fuel injection systems are costly, limited by the cylinder head structure, and difficult to install, and therefore a need exists for a fuel injector capable of injecting two different fuels.
At present, foreign companies such as western harbor and the like break through the key technology of the fuel injection system of the dual-fuel engine and form a series of products. Therefore, the dual-fuel injector for developing the independent intellectual property rights in China can break through the technical blockade in foreign countries and can promote the development of the domestic dual-fuel engine.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the not enough among the prior art, provide a fuel injector that realizes diesel oil/natural gas dual fuel injection.
The purpose of the utility model is realized through the following technical scheme.
The utility model discloses a fuel injector for realizing diesel oil/natural gas dual fuel injection, which comprises an injector body, wherein a hydraulic piston and a transition rod are arranged in the injector body, and the hydraulic piston is positioned at the top end of the transition rod; the lower end of the injector body is provided with a needle valve matching part, the needle valve matching part is fixed at the lower end of the injector body through an injector tightening cap arranged outside the needle valve matching part, a large needle valve is arranged inside the needle valve matching part, and the bottom of the needle valve matching part is provided with a natural gas spray hole and a diesel spray hole; the upper part of the large needle valve is positioned on the inner side of the lower part of the injector body, the upper part of the inner side of the needle valve matching part and the upper part of the outer side of the large needle valve are provided with mutually matched limiting shoulders, the middle part of the inner side of the needle valve matching part and the middle part of the outer side of the large needle valve are provided with mutually matched pressure-bearing conical surfaces, and a natural gas cavity is formed between the pressure-bearing conical surfaces of the needle valve matching; the large needle valve is internally and sequentially provided with a large needle valve limiting nut, a small needle valve spring, a small needle valve limiting adjusting bolt and a small needle valve from top to bottom, the large needle valve limiting nut is fixedly connected with the large needle valve through threads, and the lower part of the small needle valve limiting adjusting bolt is fixedly connected with the small needle valve through threads; the lower part of the transition rod sequentially penetrates through the lower part gasket, the large needle valve spring, the large needle valve limiting nut and the small needle valve spring and is contacted with the top of the small needle valve limiting adjusting bolt; the space enclosed by the large needle valve limiting nut, the large needle valve and the small needle valve limiting adjusting bolt forms a low-pressure oil cavity at the lower part, a circumferential annular groove with a trapezoidal section is arranged on the inner side of the middle part of the large needle valve, the annular groove is positioned at the lower part of the small needle valve limiting adjusting bolt, and the space enclosed by the annular groove and the small needle valve forms a high-pressure oil cavity; a space between the lower gasket and the large needle valve limiting nut forms an upper low-pressure oil cavity;
the upper end of the injector body is connected with a balance valve tightening cap through threads, the upper end of the balance valve tightening cap is connected with an iron core tightening cap through threads, an iron core lower body and an armature are sequentially arranged in the iron core tightening cap from top to bottom, an electromagnetic coil is arranged on the outer side of the lower end of the iron core and positioned between the iron core lower body and the iron core, and the armature is positioned between the iron core lower body and the balance valve tightening cap; an armature upper spring seat and an armature lower spring seat are arranged in the iron core, an armature spring is arranged between the armature upper spring seat and the armature lower spring seat, and the lower end of the armature lower spring seat penetrates through the iron core to be in contact with the armature;
a balance valve seat, a transition block and a metering orifice block are sequentially arranged in the balance valve tightening cap from top to bottom, a balance valve which is ground in a matched manner with the balance valve seat is arranged in the balance valve seat, and the upper part of the balance valve is connected with an armature through threads; the side wall of the balance valve seat is provided with a balance valve seat oil outlet channel and a balance valve seat oil inlet channel, the side wall of the transition block is provided with a transition block oil return channel and a transition block high-pressure oil channel, the side wall of the metering orifice block is provided with a metering orifice block oil return channel, an oil outlet metering orifice and an oil inlet metering orifice, and a space surrounded by the metering orifice block, the injector body and the hydraulic piston forms a control cavity; the upper end of the oil outlet passage of the balance valve seat is communicated with the inner cavity of the balance valve locking cap, the upper end of the transition block oil return passage is communicated with the lower end of the oil outlet passage of the balance valve seat, the lower end of the oil inlet passage of the balance valve seat is communicated with the upper end of the oil return passage of the metering orifice block, the upper end of the oil inlet passage of the balance valve seat is communicated with the inner cavity of the balance valve seat at the position of the balance valve, the lower end of the oil inlet passage of the balance valve seat is communicated with the upper end of the high-pressure oil passage of the transition;
the side wall of the injector body is circumferentially provided with an oil return interface, an oil inlet interface and an air inlet interface which are respectively communicated with the outside, the oil return interface is communicated with the lower low-pressure oil cavity through a first oil return passage and an upper low-pressure oil cavity downwards, the oil return interface is communicated with the orifice block oil return passage upwards through a second oil return passage, the oil inlet interface is communicated with the oil inlet orifice upwards through a second high-pressure oil passage, the oil inlet interface is communicated with the diesel oil orifice downwards through a first high-pressure oil passage, a large needle valve oil inlet and a high-pressure oil cavity, and the air inlet interface is communicated with the natural gas orifice through a high-pressure air passage.
The upper part of the tight cap of the injector is connected with the injector body through threads, and a shoulder used for axially positioning the tight cap of the injector is arranged outside the needle valve matching part.
The injector is characterized in that a limiting shoulder is arranged in the lower end of the injector body, a large needle valve limiting adjusting pad is arranged at the limiting shoulder and is positioned at the top of the large needle valve, a lower positioning pin for preventing the large needle valve limiting adjusting pad from rotating relative to the large needle valve is arranged between the limiting shoulder and the large needle valve limiting adjusting pad, and a large needle valve spring is positioned in the large needle valve limiting adjusting pad.
And a small needle valve pressure-bearing conical surface is arranged outside the upper end of the small needle valve.
The iron core upper end is through iron core locking screw and the tight cap fixed connection of iron core, and the lower extreme passes through iron core connecting screw and the iron core lower part of the body fixed connection, the iron core is provided with the wiring pipe, the tight cap top trompil of iron core is provided with the connecting bolt who is located wiring pipe directly over, and is fixed through wiring nut, upper portion gasket.
An armature lift adjusting gasket is arranged between the armature and the iron core tightening cap, and the armature lift adjusting gasket is positioned between the iron core lower body and the balance valve tightening cap.
And the armature upper spring seat is fixed inside the top end of the iron core tightening cap through threads.
Through circular bead axial positioning between balanced disk seat and the balanced valve lock nut, fix relative position through the locating pin between balanced disk seat and the transition piece, fix relative position through the locating pin between transition piece and the graduated bore piece, the graduated bore piece is located the sprayer upper end, fixes relative position through upper portion locating pin.
The second oil return passage, the first oil return passage, the second high-pressure oil passage, the first high-pressure oil passage and the high-pressure air passage are arranged on the side wall of the ejector body, and the oil inlet of the large needle valve is arranged on the side wall of the large needle valve.
Compared with the prior art, the utility model discloses a beneficial effect that technical scheme brought is:
(1) the utility model discloses utilize solenoid, can realize diesel oil and natural gas dual fuel's independent control and independent injection and have faster response speed, improve the combustion efficiency of internal-combustion engine and optimized the internal-combustion engine and discharged, realize the wide use of natural gas on well heavy-duty car.
(2) The utility model discloses a needle valve spring pretightning force can be adjusted in a flexible way to the spacing bolt of regulation needle valve, has strengthened the suitability of sprayer.
(3) The utility model discloses a diesel oil natural gas dual fuel injection is realized to the structure of the little needle valve of big needle valve barrel, and compact structure conveniently arranges on the cylinder head, satisfies the engine miniaturization, the requirement of intensification.
(4) The utility model discloses a hydraulic balance mechanism can improve the pressure index demand of sprayer.
Drawings
FIG. 1 is a schematic diagram of the diesel side of the present invention;
FIG. 2 is an enlarged schematic view of the diesel side upper part of the present invention;
FIG. 3 is an enlarged schematic view of the lower side of the diesel oil of the present invention;
FIG. 4 is a schematic view of the natural gas side of the present invention;
fig. 5 is an enlarged view of the lower part of the natural gas side of the present invention.
Reference numerals: 1-needle valve coupling parts; 2-large needle valve; 3-small needle valve; 4-natural gas cavity; 5-a high-pressure oil chamber; 6-tightening the injector cap; 7-a lower low pressure oil chamber; 8-small needle valve spring; 9-large needle valve limit nut; 10-large needle valve spring; 11-lower gasket; 12-an injector body; 13-a first high pressure gallery; 14-a transition rod; 15-a hydraulic piston; 16-an oil inlet interface; 17-a second high pressure gallery; 18-upper O-ring; 19-a control chamber; 20-measuring the hole block; 21-oil inlet holes; 22-a transition block; 23-a transition block high pressure oil gallery; 24-balanced valve seat oil inlet channel; 25-a balanced valve seat; 26-a balancing valve; 27-an armature; 28-core attachment screws; 29-armature lower spring seat; 30-an armature spring; 31-armature upper spring seat; 32-core locking screws; 33-a terminal nut; 34-an upper gasket; 35-a wiring conduit; 36-a core; 37-iron core tightening cap; 38-core lower body; 39-a solenoid coil; 40-armature lift adjustment shim; 41-lower O-ring; 42-balanced valve seat oil outlet channel; 43-balanced valve locking cap; 44-transition block oil return; 45-gauge hole block oil return passage; 46-upper locating pins; 47-oil outlet measuring hole; 48-a second oil return channel; 49-oil return interface; 50-a first oil return passage; 51-big needle valve limit adjusting pad; 52-lower locating pin; 53-small needle valve limit adjusting bolt; 54-small needle valve pressure-bearing conical surface; 55-pressure bearing conical surface; 56-natural gas spraying holes; 57-diesel oil jet orifice; 58-an upper low pressure oil chamber; 59-an air intake interface; 60-high pressure air channel; 61-big needle valve oil inlet.
Detailed Description
For a more clear explanation of the invention, the following detailed description is given with reference to the accompanying drawings and the specific embodiments.
As shown in fig. 1 to 5, the utility model discloses realize diesel oil/natural gas dual fuel injection's fuel injector, including injector body 12, injector body 12 is inside to be provided with hydraulic piston 15 and transition pole 14 along the central axis, and hydraulic piston 15 is located the top of transition pole 14, hydraulic piston 15 pairs with injector body 12 and grinds, transition pole 14 pairs with injector body 12 and grinds, no relation of connection between hydraulic piston 15 and the transition pole 14.
12 lower extreme of sprayer is provided with needle valve idol piece 1, needle valve idol piece 1 is fixed at 12 lower extremes of sprayer through setting up its outside tight cap 6 of sprayer, through threaded connection between the tight cap 6 upper portion of sprayer and the sprayer 12, needle valve idol piece 1 outside be provided with be used for with the shoulder of the tight cap 6 axial positioning of sprayer. The needle valve coupling part 1 is internally provided with a large needle valve 2 which moves up and down along the axis of the needle valve coupling part, and the bottom of the needle valve coupling part is provided with a natural gas spray hole 56 and a diesel spray hole 57. The needle valve matching part comprises a needle valve matching part 1, a large needle valve 2 and a valve seat, wherein the upper part of the inner side of the needle valve matching part 1 and the upper part of the outer side of the large needle valve 2 are provided with limiting shoulders matched with each other, the middle part of the inner side of the needle valve matching part 1 and the middle part of the outer side of the large needle valve 2 are provided with bearing conical surfaces 55 matched with each other, and a natural gas cavity 4 is formed between the. The upper part of the large needle valve 2 is positioned on the inner side of the lower part of the injector body 12, a limiting shoulder is arranged inside the lower end of the injector body 12, a large needle valve limiting adjusting pad 51 is arranged at the limiting shoulder, the large needle valve limiting adjusting pad 51 is positioned at the top of the large needle valve 2, a lower positioning pin 52 for preventing the large needle valve limiting adjusting pad from rotating relative to the large needle valve limiting adjusting pad is arranged between the large needle valve limiting adjusting pad and the large needle valve 2, and the injector body 12 and the needle.
Big needle valve 2 is inside from top to bottom to be provided with big needle valve stop nut 9, little needle valve spring 8, the spacing adjusting bolt 53 of little needle valve, little needle valve 3 in proper order. The large needle valve limiting nut 9 is hollow, the large needle valve limiting nut 9 is fixedly connected with the large needle valve 2 through threads, the lower portion of the small needle valve limiting adjusting bolt 53 is fixedly connected with the small needle valve 3 through threads, and a small needle valve pressure-bearing conical surface 54 is arranged on the outer portion of the upper end of the small needle valve 3. The lower part inner side of the injector body 12 is provided with a lower part gasket 11, a large needle valve spring 10 is arranged between the lower part gasket 11 and the large needle valve limiting nut 9, and the large needle valve spring 10 is positioned in the large needle valve limiting adjusting pad 51. The lower part of the transition rod 14 sequentially penetrates through a lower gasket 11, a large needle valve spring 10, a large needle valve limiting nut 9 and a small needle valve spring 8 to be in contact with the top of a small needle valve limiting adjusting bolt 53. The space enclosed by the large needle valve limiting nut 9, the large needle valve 2 and the small needle valve limiting adjusting bolt 53 forms a lower low-pressure oil chamber 7, a circumferential annular groove with a trapezoidal section is arranged on the inner side of the middle part of the large needle valve 2 and is positioned on the lower part of the small needle valve limiting adjusting bolt 53, and the space enclosed by the annular groove and the small needle valve 3 forms a high-pressure oil chamber 5; the space between the lower gasket 11 and the large needle valve stop nut 9 constitutes an upper low-pressure oil chamber 58.
Wherein, the outside of big needle valve 2 and the inboard regional precision grinding of the inboard matching of needle valve idol 1 and mate, the inboard of big needle valve 2 and the outside matching of little needle valve 3 regional precision grinding and mate, the outside of big needle valve 2 and the inboard matching of injector body 12 regional precision grinding and mate, realize the sealed of fuel through the mate. The big needle valve 2 controls the injection of natural gas, and the small needle valve 3 controls the injection of diesel oil. One end of the small needle valve spring 8 is arranged on the small needle valve limiting adjusting bolt 53, and the other end of the small needle valve spring is arranged below the large needle valve limiting nut 9; the lower end of the large needle valve spring 10 is clamped on the large needle valve limiting nut 9, and the upper end of the large needle valve spring abuts against the injector body 12 through the lower gasket 11. The acting force of the large needle valve spring 10 is larger than that of the small needle valve spring 8, when diesel oil is injected, the small needle valve spring 8 is compressed, the large needle valve limiting nut 9 bears the upward acting force, but the large needle valve limiting nut 9 is still, the large needle valve spring 10 is not compressed, and the large needle valve 2 is also still.
The upper end of the injector body 12 is connected with a balance valve tightening cap 43 through threads, the upper end of the balance valve tightening cap 43 is connected with an iron core tightening cap 37 through threads, a lower O-shaped ring 18 is arranged between the injector body 12 and the balance valve tightening cap 43, and an upper O-shaped ring 41 is arranged between the balance valve tightening cap 43 and the iron core tightening cap 37. The iron core fastening cap 37 is internally provided with an iron core 36, an iron core lower body 38 and an armature 27 from top to bottom in sequence. The upper end of the iron core 36 is fixedly connected with an iron core fastening cap 37 through an iron core locking screw 32, and the lower end is fixedly connected with an iron core lower body 38 through an iron core connecting screw 28. The iron core 36 is provided with a wiring guide pipe 35, and an opening at the top of the iron core tightening cap 37 is provided with a connecting bolt located at the right upper end of the wiring guide pipe 35 and fixed through a wiring nut 33 and an upper gasket 34. An armature lift adjusting gasket 40 is arranged between the armature 27 and the core tightening cap 37, and the armature lift adjusting gasket 40 is positioned between the core lower body 38 and the balance valve tightening cap 43.
The lower end of the iron core 36 is provided with an electromagnetic coil 39, the electromagnetic coil 39 is positioned between the iron core lower body 38 and the iron core 36, and the armature 27 is positioned between the iron core lower body 38 and the balance valve cap 43. An armature upper spring seat 31 and an armature lower spring seat 29 are arranged inside the iron core 36, an armature spring 30 is arranged between the armature upper spring seat 31 and the armature lower spring seat 29, and the lower end of the armature lower spring seat 29 penetrates through the iron core 36 to be in contact with the armature 27, but is not connected. The armature upper spring seat 31 is fixed inside the top end of the core cap 37 by a screw.
The balance valve seat 25, the transition block 22 and the orifice measuring block 20 are sequentially arranged in the balance valve fastening cap 43 from top to bottom. The balance valve seat 25 and the balance valve fastening cap 43 are axially positioned through a shoulder, the balance valve seat 25 and the transition block 22 are fixed in relative positions through positioning pins, the transition block 22 and the orifice block 20 are fixed in relative positions through positioning pins, and the orifice block 20 is located at the upper end of the injector body 12 and fixed in relative positions through an upper positioning pin 46. The space enclosed by the orifice block 20, the injector body 12 and the hydraulic piston 15 forms a control chamber 19.
The balance valve seat 25 is internally provided with a balance valve 26 which is ground in a matching way, and the upper part of the balance valve 26 is connected with an armature 27 through threads. The side wall of the balance valve seat 25 is provided with a balance valve seat oil outlet passage 42 and a balance valve seat oil inlet passage 24, the side wall of the transition block 22 is provided with a transition block oil return passage 44 and a transition block high-pressure oil passage 23, the side wall of the metering hole block 20 is provided with a metering hole block oil return passage 45, an oil outlet metering hole 47 and an oil inlet metering hole 21, the upper end of the oil outlet channel 42 of the balance valve seat is communicated with the inner cavity of the balance valve fastening cap 43, the upper end of the transition block oil return channel 44 is communicated with the lower end of the oil outlet channel 42 of the balance valve seat, the lower end is communicated with the upper end of the metering orifice block oil return channel 45, the upper end of the oil inlet channel 24 of the balance valve seat is communicated with the inner cavity of the balance valve seat 25 at the position of the balance valve 26, the lower end is communicated with the upper end of the high-pressure oil channel 23 of the transition block, the upper end of the oil outlet hole 47 is communicated with the lower end of the transition block high-pressure oil passage 23, the lower end is communicated with the control cavity 19, one end of the oil inlet hole 21 is communicated with the control cavity 19, and the other end is communicated with the second high-pressure oil passage 17. Wherein the balancing valve 26 separates the balancing valve seat oil inlet passage 24 from the balancing valve seat oil outlet passage 42.
The side wall of the injector body 12 is circumferentially provided with an oil return interface 49, an oil inlet interface 16 and an air inlet interface 59 which are respectively communicated with the outside, the oil return interface 49 is communicated with the lower low-pressure oil cavity 7 through a first oil return passage 50 and an upper low-pressure oil cavity 58 downwards, the oil return interface 49 is communicated with the hole measuring block oil return passage 45 through a second oil return passage 48 upwards, the oil inlet interface 16 is communicated with the oil inlet measuring hole 21 through a second high-pressure oil passage 17 upwards, the oil inlet interface 16 is communicated with the diesel oil spray hole 57 through a first high-pressure oil passage 13, a large needle valve oil inlet 61 and a high-pressure oil cavity 5 downwards, and the air inlet interface 59 is communicated with the natural gas spray hole 56 through a high-pressure. The second oil return passage 48, the first oil return passage 50, the second high-pressure oil passage 17, the first high-pressure oil passage 13 and the high-pressure air passage 60 are arranged on the side wall of the injector body 12, and the large needle valve oil inlet 61 is arranged on the side wall of the large needle valve 2.
The upper low-pressure oil chamber 58 and the lower low-pressure oil chamber 7 are communicated through a middle gap of the large needle valve limiting nut 9, high-pressure diesel oil is filled in the high-pressure oil chamber 5, although sealing is achieved through a coupling, part of the diesel oil can still leak, and the leaked diesel oil is led back to the oil tank through the lower low-pressure oil chamber 7 and the upper low-pressure oil chamber 58 by the first oil return channel 50.
The diesel injection principle:
high-pressure diesel enters the ejector from the oil inlet interface 16 and is divided into two paths, and one path of high-pressure diesel enters the high-pressure oil cavity 5 through the first high-pressure oil duct 13 and the large needle valve oil inlet 61; and the other path of high-pressure diesel oil enters the control cavity 19 through the second high-pressure oil passage 17 and the oil inlet metering hole 21, and the control cavity 19 is communicated with the oil inlet passage 24 of the balance valve seat through the oil outlet metering hole 47 and the transition block high-pressure oil passage 23. The diesel oil that gets in and out in the control cavity 19 is led on with the external world by oil inlet measuring hole 21 and the delivery measuring hole 47 of graduated flask piece 20 respectively, and oil inlet measuring hole 21 aperture of graduated flask piece is less than delivery measuring hole 47 aperture. When waiting for the injection of fuel, the diesel oil in the control chamber 19 is in a static state, and the oil pressure thereof is kept the same as the oil pressure in the high-pressure oil chamber 5 in the needle valve body (i.e., the pressure in the common rail pipe). At the moment, the large needle valve 2 and the small needle valve 3 are pressed on the needle valve matching part 1 under the action of the springs, and the diesel injection holes 57 are closed.
When the diesel oil is injected, the electromagnetic coil 39 is electrified to generate electromagnetic force to attract the armature 27 to rise, the armature spring 30 is compressed to drive the balance valve 26 to rise, the oil inlet channel 24 of the balance valve seat is communicated with the oil outlet channel 42 of the balance valve seat, when the balance valve 26 operated by the electromagnetic valve is opened instantly, because the diameter of the oil inlet metering hole 21 of the metering hole block 20 is small and the diameter of the oil outlet metering hole 47 is large, diesel oil in the control cavity 19 instantly flows in a small amount and flows out a large amount, the oil pressure in the cavity instantly drops, so that the oil pressure in the high-pressure oil cavity 5 of the oil injection nozzle is greatly lower than that in the oil pressure cavity 5, the pressure bearing conical surface 54 of the small needle valve bears upward pressure, the downward acting force of the small needle valve spring 8 and the top surface of the hydraulic piston 15 is overcome, the small needle valve spring 8 is compressed, the small needle valve 3 drives the transition rod 14 and the hydraulic piston 15 to move upwards together, the diesel oil spray hole 57 is opened, and the. Diesel oil flowing into the oil outlet channel 42 of the balance valve seat enters an oil return port 49 through a transition block oil return channel 44, a metering orifice block oil return channel 45 and a second oil return channel 48 and returns to the oil tank.
When oil injection is finished, the electromagnetic coil 39 is powered off, the armature 27 and the balance valve 26 descend under the action of the armature spring 30, the oil inlet channel 24 of the balance valve seat and the oil outlet channel 42 of the balance valve seat are blocked, the oil pressure in the control cavity 19 is kept the same as the oil pressure in the high-pressure oil cavity 5 in the large needle valve 2, the small needle valve 3 moves downwards under the action of the small needle valve spring 8, the diesel oil spray hole 57 is closed, and oil injection is finished. Meanwhile, the reciprocating motion of the small needle valve 3 can cause part of diesel oil to leak from the high-pressure oil chamber 5 to the low-pressure oil chamber 7, and the part of the low-pressure diesel oil enters the low-pressure oil chamber 58 through the middle gap of the large needle valve limiting nut 9 and enters the oil return port 49 through the first oil return channel 50 to return to the oil tank.
The natural gas injection principle is as follows:
when the air is not injected, the large needle valve 2 is pressed on the inner side surface of the needle valve coupling part 1 by the large needle valve spring 10, and the small needle valve 3 is pressed on the inner side surface of the large needle valve 2 by the small needle valve spring 8.
When natural gas is sprayed, the electromagnetic coil 39 is firstly electrified, the oil inlet channel 24 of the balance valve seat is communicated with the oil outlet channel 42 of the balance valve seat, the common rail pipe does not supply high-pressure diesel oil to the oil injector, and the hydraulic piston 15 can freely move up and down in the control cavity 19. When high-pressure natural gas enters the natural gas cavity 4 through the air inlet connector 59 and the high-pressure air passage 60, the pressure-bearing conical surface 55 outside the large needle valve is subjected to upward pressure, the force is larger than the downward acting force of the large needle valve spring 10, so that the large needle valve 2 moves upward, and the large needle valve spring 10 is compressed. At this time, the small needle valve 3, the transition rod 14 and the hydraulic piston 15 are driven to move upwards together, and the small needle valve spring 8 is not compressed. The natural gas orifice 56 opens and gas injection begins.
When the supply of the high-pressure natural gas is stopped, the large needle valve 2 and the small needle valve 3 are seated by the urging force of the springs, and the natural gas injection holes 56 are closed to stop the injection of the gas.
Although the present invention has been described with reference to the accompanying drawings, the present invention is not limited to the above specific functions and operations, and the above specific embodiments are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention, which is within the protection scope of the present invention.
Claims (9)
1. A fuel injector for realizing diesel/natural gas dual fuel injection comprises an injector body (12), and is characterized in that a hydraulic piston (15) and a transition rod (14) are arranged in the injector body (12), and the hydraulic piston (15) is positioned at the top end of the transition rod (14); the lower end of the injector body (12) is provided with a needle valve coupling part (1), the needle valve coupling part (1) is fixed at the lower end of the injector body (12) through an injector tightening cap (6) arranged outside the needle valve coupling part, a large needle valve (2) is arranged inside the needle valve coupling part (1), and the bottom of the needle valve coupling part is provided with a natural gas spray hole (56) and a diesel spray hole (57); the upper part of the large needle valve (2) is positioned on the inner side of the lower part of the injector body (12), the upper part of the inner side of the needle valve coupling part (1) and the upper part of the outer side of the large needle valve (2) are provided with mutually matched limiting shoulders, the middle part of the inner side of the needle valve coupling part (1) and the middle part of the outer side of the large needle valve (2) are provided with mutually matched pressure-bearing conical surfaces (55), and a natural gas cavity (4) is formed between the pressure-bearing conical surfaces (55) of the needle valve coupling part (1) and the; the large needle valve (2) is internally and sequentially provided with a large needle valve limiting nut (9), a small needle valve spring (8), a small needle valve limiting adjusting bolt (53) and a small needle valve (3) from top to bottom, the large needle valve limiting nut (9) is fixedly connected with the large needle valve (2) through threads, and the lower part of the small needle valve limiting adjusting bolt (53) is fixedly connected with the small needle valve (3) through threads; a lower gasket (11) is arranged on the inner side of the lower part of the injector body (12), a large needle valve spring (10) is arranged between the lower gasket (11) and the large needle valve limiting nut (9), and the lower part of the transition rod (14) sequentially penetrates through the lower gasket (11), the large needle valve spring (10), the large needle valve limiting nut (9) and the small needle valve spring (8) and is contacted with the top of the small needle valve limiting adjusting bolt (53); the space enclosed by the large needle valve limiting nut (9), the large needle valve (2) and the small needle valve limiting adjusting bolt (53) forms a lower low-pressure oil chamber (7), a circumferential annular groove with a trapezoidal section is arranged on the inner side of the middle part of the large needle valve (2), the annular groove is positioned on the lower part of the small needle valve limiting adjusting bolt (53), and the space enclosed by the annular groove and the small needle valve (3) forms a high-pressure oil chamber (5); a space between the lower gasket (11) and the large needle valve limiting nut (9) forms an upper low-pressure oil chamber (58);
the upper end of the injector body (12) is connected with a balance valve tightening cap (43) through threads, the upper end of the balance valve tightening cap (43) is connected with an iron core tightening cap (37) through threads, an iron core (36), an iron core lower body (38) and an armature (27) are sequentially arranged in the iron core tightening cap (37) from top to bottom, an electromagnetic coil (39) is arranged on the outer side of the lower end of the iron core (36), the electromagnetic coil (39) is located between the iron core lower body (38) and the iron core (36), and the armature (27) is located between the iron core lower body (38) and the balance valve tightening cap (43); an armature upper spring seat (31) and an armature lower spring seat (29) are arranged in the iron core (36), an armature spring (30) is arranged between the armature upper spring seat (31) and the armature lower spring seat (29), and the lower end of the armature lower spring seat (29) penetrates through the iron core (36) to be in contact with the armature (27);
a balance valve seat (25), a transition block (22) and a metering orifice block (20) are sequentially arranged in the balance valve tightening cap (43) from top to bottom, a balance valve (26) which is ground in a matched manner with the balance valve seat (25) is arranged in the balance valve seat (25), and the upper part of the balance valve (26) is connected with an armature (27) through threads; a balance valve seat oil outlet channel (42) and a balance valve seat oil inlet channel (24) are arranged on the side wall of the balance valve seat (25), a transition block oil return channel (44) and a transition block high-pressure oil channel (23) are arranged on the side wall of the transition block (22), a metering hole block oil return channel (45), an oil outlet metering hole (47) and an oil inlet metering hole (21) are arranged on the side wall of the metering hole block (20), and a space surrounded by the metering hole block (20), the injector body (12) and the hydraulic piston (15) forms a control cavity (19); the upper end of the balance valve seat oil outlet channel (42) is communicated with the inner cavity of a balance valve tightening cap (43), the upper end of the transition block oil return channel (44) is communicated with the lower end of the balance valve seat oil outlet channel (42), the lower end of the transition block oil return channel is communicated with the upper end of a metering orifice block oil return channel (45), the upper end of the balance valve seat oil inlet channel (24) is communicated with the inner cavity of a balance valve seat (25) at the position of a balance valve (26), the lower end of the balance valve seat oil inlet channel is communicated with the upper end of a transition block high-pressure oil channel (23), the upper end of an oil outlet metering orifice (47) is communicated with the lower end of the transition block high-pressure oil channel (23), the lower end;
the injector is characterized in that an oil return interface (49), an oil inlet interface (16) and an air inlet interface (59) which are respectively communicated with the outside are arranged on the side wall of the injector body (12) along the circumference, the oil return interface (49) is communicated with a lower low-pressure oil cavity (7) through a first oil return passage (50) and an upper low-pressure oil cavity (58) downwards, the oil return interface (49) is communicated with a measuring hole block oil return passage (45) upwards through a second oil return passage (48), the oil inlet interface (16) is communicated with an oil inlet measuring hole (21) upwards through a second high-pressure oil passage (17), the oil inlet interface (16) is communicated with a diesel spray hole (57) downwards through a first high-pressure oil passage (13), a large needle valve oil inlet (61), a high-pressure oil cavity (5), and the air inlet interface (59) is communicated with a natural gas spray hole (56) through a high-pressure.
2. The fuel injector for realizing dual fuel injection of diesel/natural gas as claimed in claim 1, characterized in that the upper part of the injector locking cap (6) is connected with the injector body (12) through screw threads, and the needle valve coupling (1) is externally provided with a shoulder for axial positioning with the injector locking cap (6).
3. The fuel injector for realizing dual fuel injection of diesel/natural gas according to claim 1, characterized in that the injector body (12) is provided with a limit shoulder inside at the lower end, a large needle valve limit adjusting pad (51) is arranged at the limit shoulder, the large needle valve limit adjusting pad (51) is arranged on the top of the large needle valve (2), a lower positioning pin (52) for preventing the large needle valve limit adjusting pad from rotating relatively is arranged between the large needle valve limit adjusting pad and the large needle valve spring (10) is arranged inside the large needle valve limit adjusting pad (51).
4. The fuel injector for realizing dual fuel injection of diesel/natural gas as claimed in claim 1, characterized in that the small needle valve (3) is provided with a small needle valve bearing cone surface (54) at the upper end outside.
5. The fuel injector for realizing the dual fuel injection of diesel oil/natural gas as claimed in claim 1, wherein the upper end of the iron core (36) is fixedly connected with an iron core fastening cap (37) through an iron core locking screw (32), the lower end of the iron core (36) is fixedly connected with an iron core lower body (38) through an iron core connecting screw (28), the iron core (36) is provided with a wiring conduit (35), a connecting bolt positioned at the right upper end of the wiring conduit (35) is arranged on an opening at the top of the iron core fastening cap (37), and the iron core fastening cap is fixed through a wiring nut (33) and an upper gasket (34).
6. The fuel injector for dual fuel injection of diesel/natural gas as claimed in claim 1, characterized in that an armature lift adjusting shim (40) is arranged between the armature (27) and the core locking cap (37), and the armature lift adjusting shim (40) is located between the core lower body (38) and the balance valve locking cap (43).
7. The fuel injector for dual fuel injection of diesel/natural gas according to claim 1, characterized in that the armature upper spring seat (31) is fixed inside the top end of the core locking cap (37) by screw threads.
8. The fuel injector for dual fuel injection of diesel/natural gas according to claim 1, characterized in that the balance valve seat (25) and the balance valve clamping cap (43) are axially positioned by a shoulder, the balance valve seat (25) and the transition block (22) are fixed in relative position by a positioning pin, the transition block (22) and the orifice block (20) are fixed in relative position by a positioning pin, the orifice block (20) is located at the upper end of the injector body (12), and the relative position is fixed by an upper positioning pin (46).
9. The fuel injector for realizing dual fuel injection of diesel oil/natural gas as claimed in claim 1, characterized in that the second oil return passage (48), the first oil return passage (50), the second high pressure oil passage (17), the first high pressure oil passage (13) and the high pressure air passage (60) are arranged on the side wall of the injector body (12), and the large needle valve oil inlet (61) is arranged on the side wall of the large needle valve (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922184956.2U CN211777779U (en) | 2019-12-09 | 2019-12-09 | Fuel injector for realizing diesel/natural gas dual-fuel injection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922184956.2U CN211777779U (en) | 2019-12-09 | 2019-12-09 | Fuel injector for realizing diesel/natural gas dual-fuel injection |
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| Publication Number | Publication Date |
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| CN211777779U true CN211777779U (en) | 2020-10-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114810443A (en) * | 2022-04-29 | 2022-07-29 | 重庆红江机械有限责任公司 | Novel needle valve matching part |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114810443A (en) * | 2022-04-29 | 2022-07-29 | 重庆红江机械有限责任公司 | Novel needle valve matching part |
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